diff options
author | josh.macdonald <jmacd@users.noreply.github.com> | 2012-06-16 21:24:29 +0000 |
---|---|---|
committer | josh.macdonald <jmacd@users.noreply.github.com> | 2012-06-16 21:24:29 +0000 |
commit | 62bcc84a75e479bd20946ed9e288ee3574f4e879 (patch) | |
tree | c45d453804dda106c1e75e1cfcfe3a7ea978dfb1 /xdelta3 | |
parent | 00e24b43ffc8cc0eb2f062218646f465a8176b8f (diff) |
Add examples/iOS test app
Diffstat (limited to 'xdelta3')
14 files changed, 7640 insertions, 0 deletions
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test.xcodeproj/project.pbxproj b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test.xcodeproj/project.pbxproj new file mode 100644 index 0000000..d50d9f7 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test.xcodeproj/project.pbxproj | |||
@@ -0,0 +1,389 @@ | |||
1 | // !$*UTF8*$! | ||
2 | { | ||
3 | archiveVersion = 1; | ||
4 | classes = { | ||
5 | }; | ||
6 | objectVersion = 46; | ||
7 | objects = { | ||
8 | |||
9 | /* Begin PBXBuildFile section */ | ||
10 | B9001B65158D008900B9E855 /* xdelta3.c in Sources */ = {isa = PBXBuildFile; fileRef = B9001B63158D008900B9E855 /* xdelta3.c */; }; | ||
11 | B9313C3C158D11BA001C1F28 /* file_v1_to_v2.bin in Resources */ = {isa = PBXBuildFile; fileRef = B9313C39158D11BA001C1F28 /* file_v1_to_v2.bin */; }; | ||
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18 | B9ADC6CB158CFD36007EF999 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = B9ADC6CA158CFD36007EF999 /* main.m */; }; | ||
19 | B9ADC6CF158CFD36007EF999 /* Xd3iOSAppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = B9ADC6CE158CFD36007EF999 /* Xd3iOSAppDelegate.m */; }; | ||
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23 | /* End PBXBuildFile section */ | ||
24 | |||
25 | /* Begin PBXFileReference section */ | ||
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51 | B9ADC6CC158CFD36007EF999 /* xdelta3-ios-test-Prefix.pch */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "xdelta3-ios-test-Prefix.pch"; sourceTree = "<group>"; }; | ||
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64 | files = ( | ||
65 | B9ADC6BF158CFD36007EF999 /* UIKit.framework in Frameworks */, | ||
66 | B9ADC6C1158CFD36007EF999 /* Foundation.framework in Frameworks */, | ||
67 | B9ADC6C3158CFD36007EF999 /* CoreGraphics.framework in Frameworks */, | ||
68 | ); | ||
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70 | }; | ||
71 | /* End PBXFrameworksBuildPhase section */ | ||
72 | |||
73 | /* Begin PBXGroup section */ | ||
74 | B9ADC6AF158CFD36007EF999 = { | ||
75 | isa = PBXGroup; | ||
76 | children = ( | ||
77 | B9ADC6C4158CFD36007EF999 /* xdelta3-ios-test */, | ||
78 | B9ADC6BD158CFD36007EF999 /* Frameworks */, | ||
79 | B9ADC6BB158CFD36007EF999 /* Products */, | ||
80 | ); | ||
81 | sourceTree = "<group>"; | ||
82 | }; | ||
83 | B9ADC6BB158CFD36007EF999 /* Products */ = { | ||
84 | isa = PBXGroup; | ||
85 | children = ( | ||
86 | B9ADC6BA158CFD36007EF999 /* xdelta3-ios-test.app */, | ||
87 | ); | ||
88 | name = Products; | ||
89 | sourceTree = "<group>"; | ||
90 | }; | ||
91 | B9ADC6BD158CFD36007EF999 /* Frameworks */ = { | ||
92 | isa = PBXGroup; | ||
93 | children = ( | ||
94 | B9ADC6BE158CFD36007EF999 /* UIKit.framework */, | ||
95 | B9ADC6C0158CFD36007EF999 /* Foundation.framework */, | ||
96 | B9ADC6C2158CFD36007EF999 /* CoreGraphics.framework */, | ||
97 | ); | ||
98 | name = Frameworks; | ||
99 | sourceTree = "<group>"; | ||
100 | }; | ||
101 | B9ADC6C4158CFD36007EF999 /* xdelta3-ios-test */ = { | ||
102 | isa = PBXGroup; | ||
103 | children = ( | ||
104 | B9001B56158D008900B9E855 /* xdelta3-blkcache.h */, | ||
105 | B9001B57158D008900B9E855 /* xdelta3-cfgs.h */, | ||
106 | B9001B58158D008900B9E855 /* xdelta3-decode.h */, | ||
107 | B9001B59158D008900B9E855 /* xdelta3-djw.h */, | ||
108 | B9001B5A158D008900B9E855 /* xdelta3-fgk.h */, | ||
109 | B9001B5B158D008900B9E855 /* xdelta3-hash.h */, | ||
110 | B9001B5C158D008900B9E855 /* xdelta3-internal.h */, | ||
111 | B9001B5D158D008900B9E855 /* xdelta3-list.h */, | ||
112 | B9001B5E158D008900B9E855 /* xdelta3-main.h */, | ||
113 | B9001B5F158D008900B9E855 /* xdelta3-merge.h */, | ||
114 | B9001B60158D008900B9E855 /* xdelta3-python.h */, | ||
115 | B9001B61158D008900B9E855 /* xdelta3-second.h */, | ||
116 | B9001B62158D008900B9E855 /* xdelta3-test.h */, | ||
117 | B9001B63158D008900B9E855 /* xdelta3.c */, | ||
118 | B9001B64158D008900B9E855 /* xdelta3.h */, | ||
119 | B9ADC6CD158CFD36007EF999 /* Xd3iOSAppDelegate.h */, | ||
120 | B9ADC6CE158CFD36007EF999 /* Xd3iOSAppDelegate.m */, | ||
121 | B9ADC6D0158CFD36007EF999 /* MainStoryboard_iPhone.storyboard */, | ||
122 | B9ADC6D3158CFD36007EF999 /* MainStoryboard_iPad.storyboard */, | ||
123 | B9ADC6D6158CFD36007EF999 /* Xd3iOSViewController.h */, | ||
124 | B9ADC6D7158CFD36007EF999 /* Xd3iOSViewController.m */, | ||
125 | B9ADC6C5158CFD36007EF999 /* Supporting Files */, | ||
126 | ); | ||
127 | path = "xdelta3-ios-test"; | ||
128 | sourceTree = "<group>"; | ||
129 | }; | ||
130 | B9ADC6C5158CFD36007EF999 /* Supporting Files */ = { | ||
131 | isa = PBXGroup; | ||
132 | children = ( | ||
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134 | B9313C3A158D11BA001C1F28 /* file_v1.bin */, | ||
135 | B9313C3B158D11BA001C1F28 /* file_v2.bin */, | ||
136 | B9ADC6C6158CFD36007EF999 /* xdelta3-ios-test-Info.plist */, | ||
137 | B9ADC6C7158CFD36007EF999 /* InfoPlist.strings */, | ||
138 | B9ADC6CA158CFD36007EF999 /* main.m */, | ||
139 | B9ADC6CC158CFD36007EF999 /* xdelta3-ios-test-Prefix.pch */, | ||
140 | ); | ||
141 | name = "Supporting Files"; | ||
142 | sourceTree = "<group>"; | ||
143 | }; | ||
144 | /* End PBXGroup section */ | ||
145 | |||
146 | /* Begin PBXNativeTarget section */ | ||
147 | B9ADC6B9158CFD36007EF999 /* xdelta3-ios-test */ = { | ||
148 | isa = PBXNativeTarget; | ||
149 | buildConfigurationList = B9ADC6DB158CFD36007EF999 /* Build configuration list for PBXNativeTarget "xdelta3-ios-test" */; | ||
150 | buildPhases = ( | ||
151 | B9ADC6B6158CFD36007EF999 /* Sources */, | ||
152 | B9ADC6B7158CFD36007EF999 /* Frameworks */, | ||
153 | B9ADC6B8158CFD36007EF999 /* Resources */, | ||
154 | ); | ||
155 | buildRules = ( | ||
156 | ); | ||
157 | dependencies = ( | ||
158 | ); | ||
159 | name = "xdelta3-ios-test"; | ||
160 | productName = "xdelta3-ios-test"; | ||
161 | productReference = B9ADC6BA158CFD36007EF999 /* xdelta3-ios-test.app */; | ||
162 | productType = "com.apple.product-type.application"; | ||
163 | }; | ||
164 | /* End PBXNativeTarget section */ | ||
165 | |||
166 | /* Begin PBXProject section */ | ||
167 | B9ADC6B1158CFD36007EF999 /* Project object */ = { | ||
168 | isa = PBXProject; | ||
169 | attributes = { | ||
170 | LastUpgradeCheck = 0420; | ||
171 | }; | ||
172 | buildConfigurationList = B9ADC6B4158CFD36007EF999 /* Build configuration list for PBXProject "xdelta3-ios-test" */; | ||
173 | compatibilityVersion = "Xcode 3.2"; | ||
174 | developmentRegion = English; | ||
175 | hasScannedForEncodings = 0; | ||
176 | knownRegions = ( | ||
177 | en, | ||
178 | ); | ||
179 | mainGroup = B9ADC6AF158CFD36007EF999; | ||
180 | productRefGroup = B9ADC6BB158CFD36007EF999 /* Products */; | ||
181 | projectDirPath = ""; | ||
182 | projectRoot = ""; | ||
183 | targets = ( | ||
184 | B9ADC6B9158CFD36007EF999 /* xdelta3-ios-test */, | ||
185 | ); | ||
186 | }; | ||
187 | /* End PBXProject section */ | ||
188 | |||
189 | /* Begin PBXResourcesBuildPhase section */ | ||
190 | B9ADC6B8158CFD36007EF999 /* Resources */ = { | ||
191 | isa = PBXResourcesBuildPhase; | ||
192 | buildActionMask = 2147483647; | ||
193 | files = ( | ||
194 | B9ADC6C9158CFD36007EF999 /* InfoPlist.strings in Resources */, | ||
195 | B9ADC6D2158CFD36007EF999 /* MainStoryboard_iPhone.storyboard in Resources */, | ||
196 | B9ADC6D5158CFD36007EF999 /* MainStoryboard_iPad.storyboard in Resources */, | ||
197 | B9313C3C158D11BA001C1F28 /* file_v1_to_v2.bin in Resources */, | ||
198 | B9313C3D158D11BA001C1F28 /* file_v1.bin in Resources */, | ||
199 | B9313C3E158D11BA001C1F28 /* file_v2.bin in Resources */, | ||
200 | ); | ||
201 | runOnlyForDeploymentPostprocessing = 0; | ||
202 | }; | ||
203 | /* End PBXResourcesBuildPhase section */ | ||
204 | |||
205 | /* Begin PBXSourcesBuildPhase section */ | ||
206 | B9ADC6B6158CFD36007EF999 /* Sources */ = { | ||
207 | isa = PBXSourcesBuildPhase; | ||
208 | buildActionMask = 2147483647; | ||
209 | files = ( | ||
210 | B9ADC6CB158CFD36007EF999 /* main.m in Sources */, | ||
211 | B9ADC6CF158CFD36007EF999 /* Xd3iOSAppDelegate.m in Sources */, | ||
212 | B9ADC6D8158CFD36007EF999 /* Xd3iOSViewController.m in Sources */, | ||
213 | B9001B65158D008900B9E855 /* xdelta3.c in Sources */, | ||
214 | ); | ||
215 | runOnlyForDeploymentPostprocessing = 0; | ||
216 | }; | ||
217 | /* End PBXSourcesBuildPhase section */ | ||
218 | |||
219 | /* Begin PBXVariantGroup section */ | ||
220 | B9ADC6C7158CFD36007EF999 /* InfoPlist.strings */ = { | ||
221 | isa = PBXVariantGroup; | ||
222 | children = ( | ||
223 | B9ADC6C8158CFD36007EF999 /* en */, | ||
224 | ); | ||
225 | name = InfoPlist.strings; | ||
226 | sourceTree = "<group>"; | ||
227 | }; | ||
228 | B9ADC6D0158CFD36007EF999 /* MainStoryboard_iPhone.storyboard */ = { | ||
229 | isa = PBXVariantGroup; | ||
230 | children = ( | ||
231 | B9ADC6D1158CFD36007EF999 /* en */, | ||
232 | ); | ||
233 | name = MainStoryboard_iPhone.storyboard; | ||
234 | sourceTree = "<group>"; | ||
235 | }; | ||
236 | B9ADC6D3158CFD36007EF999 /* MainStoryboard_iPad.storyboard */ = { | ||
237 | isa = PBXVariantGroup; | ||
238 | children = ( | ||
239 | B9ADC6D4158CFD36007EF999 /* en */, | ||
240 | ); | ||
241 | name = MainStoryboard_iPad.storyboard; | ||
242 | sourceTree = "<group>"; | ||
243 | }; | ||
244 | /* End PBXVariantGroup section */ | ||
245 | |||
246 | /* Begin XCBuildConfiguration section */ | ||
247 | B9ADC6D9158CFD36007EF999 /* Debug */ = { | ||
248 | isa = XCBuildConfiguration; | ||
249 | buildSettings = { | ||
250 | ALWAYS_SEARCH_USER_PATHS = NO; | ||
251 | ARCHS = "$(ARCHS_STANDARD_32_BIT)"; | ||
252 | CLANG_ENABLE_OBJC_ARC = YES; | ||
253 | "CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer"; | ||
254 | COPY_PHASE_STRIP = NO; | ||
255 | GCC_C_LANGUAGE_STANDARD = gnu99; | ||
256 | GCC_DYNAMIC_NO_PIC = NO; | ||
257 | GCC_INPUT_FILETYPE = sourcecode.c.objc; | ||
258 | GCC_OPTIMIZATION_LEVEL = 0; | ||
259 | GCC_PREPROCESSOR_DEFINITIONS = ( | ||
260 | "XD3_USE_LARGEFILE64=0", | ||
261 | "XD3_POSIX=1", | ||
262 | "EXTERNAL_COMPRESSION=0", | ||
263 | "NOT_MAIN=1", | ||
264 | "XD3_MAIN=1", | ||
265 | "SECONDARY_DJW=1", | ||
266 | "XD3_DEBUG=1", | ||
267 | "REGRESSION_TEST=1", | ||
268 | "SHELL_TESTS=0", | ||
269 | "SECONDARY_FGK=1", | ||
270 | "DEBUG=1", | ||
271 | "$(inherited)", | ||
272 | ); | ||
273 | GCC_SYMBOLS_PRIVATE_EXTERN = NO; | ||
274 | GCC_VERSION = com.apple.compilers.llvm.clang.1_0; | ||
275 | GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES; | ||
276 | GCC_WARN_ABOUT_RETURN_TYPE = YES; | ||
277 | GCC_WARN_UNUSED_VARIABLE = YES; | ||
278 | IPHONEOS_DEPLOYMENT_TARGET = 5.0; | ||
279 | OTHER_CFLAGS = ( | ||
280 | "-DXD3_USE_LARGEFILE64=0", | ||
281 | "-DXD3_POSIX=1", | ||
282 | "-DEXTERNAL_COMPRESSION=0", | ||
283 | "-DNOT_MAIN=1", | ||
284 | "-DXD3_MAIN=1", | ||
285 | "-DSECONDARY_DJW=1", | ||
286 | "-DXD3_DEBUG=1", | ||
287 | "-DREGRESSION_TEST=1", | ||
288 | "-DSHELL_TESTS=0", | ||
289 | "-DSECONDARY_FGK=1", | ||
290 | ); | ||
291 | SDKROOT = iphoneos; | ||
292 | TARGETED_DEVICE_FAMILY = "1,2"; | ||
293 | }; | ||
294 | name = Debug; | ||
295 | }; | ||
296 | B9ADC6DA158CFD36007EF999 /* Release */ = { | ||
297 | isa = XCBuildConfiguration; | ||
298 | buildSettings = { | ||
299 | ALWAYS_SEARCH_USER_PATHS = NO; | ||
300 | ARCHS = "$(ARCHS_STANDARD_32_BIT)"; | ||
301 | CLANG_ENABLE_OBJC_ARC = YES; | ||
302 | "CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer"; | ||
303 | COPY_PHASE_STRIP = YES; | ||
304 | GCC_C_LANGUAGE_STANDARD = gnu99; | ||
305 | GCC_INPUT_FILETYPE = sourcecode.c.objc; | ||
306 | GCC_PREPROCESSOR_DEFINITIONS = ( | ||
307 | "XD3_USE_LARGEFILE64=0", | ||
308 | "XD3_POSIX=1", | ||
309 | "EXTERNAL_COMPRESSION=0", | ||
310 | "NOT_MAIN=1", | ||
311 | "XD3_MAIN=1", | ||
312 | "SECONDARY_DJW=1", | ||
313 | "XD3_DEBUG=1", | ||
314 | "REGRESSION_TEST=1", | ||
315 | "SHELL_TESTS=0", | ||
316 | "SECONDARY_FGK=1", | ||
317 | ); | ||
318 | GCC_VERSION = com.apple.compilers.llvm.clang.1_0; | ||
319 | GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES; | ||
320 | GCC_WARN_ABOUT_RETURN_TYPE = YES; | ||
321 | GCC_WARN_UNUSED_VARIABLE = YES; | ||
322 | IPHONEOS_DEPLOYMENT_TARGET = 5.0; | ||
323 | OTHER_CFLAGS = ( | ||
324 | "-DXD3_USE_LARGEFILE64=0", | ||
325 | "-DXD3_POSIX=1", | ||
326 | "-DEXTERNAL_COMPRESSION=0", | ||
327 | "-DNOT_MAIN=1", | ||
328 | "-DXD3_MAIN=1", | ||
329 | "-DSECONDARY_DJW=1", | ||
330 | "-DXD3_DEBUG=1", | ||
331 | "-DREGRESSION_TEST=1", | ||
332 | "-DSHELL_TESTS=0", | ||
333 | "-DSECONDARY_FGK=1", | ||
334 | ); | ||
335 | SDKROOT = iphoneos; | ||
336 | TARGETED_DEVICE_FAMILY = "1,2"; | ||
337 | VALIDATE_PRODUCT = YES; | ||
338 | }; | ||
339 | name = Release; | ||
340 | }; | ||
341 | B9ADC6DC158CFD36007EF999 /* Debug */ = { | ||
342 | isa = XCBuildConfiguration; | ||
343 | buildSettings = { | ||
344 | GCC_PRECOMPILE_PREFIX_HEADER = YES; | ||
345 | GCC_PREFIX_HEADER = "xdelta3-ios-test/xdelta3-ios-test-Prefix.pch"; | ||
346 | INFOPLIST_FILE = "xdelta3-ios-test/xdelta3-ios-test-Info.plist"; | ||
347 | OTHER_CFLAGS = ""; | ||
348 | PRODUCT_NAME = "$(TARGET_NAME)"; | ||
349 | WRAPPER_EXTENSION = app; | ||
350 | }; | ||
351 | name = Debug; | ||
352 | }; | ||
353 | B9ADC6DD158CFD36007EF999 /* Release */ = { | ||
354 | isa = XCBuildConfiguration; | ||
355 | buildSettings = { | ||
356 | GCC_PRECOMPILE_PREFIX_HEADER = YES; | ||
357 | GCC_PREFIX_HEADER = "xdelta3-ios-test/xdelta3-ios-test-Prefix.pch"; | ||
358 | INFOPLIST_FILE = "xdelta3-ios-test/xdelta3-ios-test-Info.plist"; | ||
359 | OTHER_CFLAGS = ""; | ||
360 | PRODUCT_NAME = "$(TARGET_NAME)"; | ||
361 | WRAPPER_EXTENSION = app; | ||
362 | }; | ||
363 | name = Release; | ||
364 | }; | ||
365 | /* End XCBuildConfiguration section */ | ||
366 | |||
367 | /* Begin XCConfigurationList section */ | ||
368 | B9ADC6B4158CFD36007EF999 /* Build configuration list for PBXProject "xdelta3-ios-test" */ = { | ||
369 | isa = XCConfigurationList; | ||
370 | buildConfigurations = ( | ||
371 | B9ADC6D9158CFD36007EF999 /* Debug */, | ||
372 | B9ADC6DA158CFD36007EF999 /* Release */, | ||
373 | ); | ||
374 | defaultConfigurationIsVisible = 0; | ||
375 | defaultConfigurationName = Release; | ||
376 | }; | ||
377 | B9ADC6DB158CFD36007EF999 /* Build configuration list for PBXNativeTarget "xdelta3-ios-test" */ = { | ||
378 | isa = XCConfigurationList; | ||
379 | buildConfigurations = ( | ||
380 | B9ADC6DC158CFD36007EF999 /* Debug */, | ||
381 | B9ADC6DD158CFD36007EF999 /* Release */, | ||
382 | ); | ||
383 | defaultConfigurationIsVisible = 0; | ||
384 | defaultConfigurationName = Release; | ||
385 | }; | ||
386 | /* End XCConfigurationList section */ | ||
387 | }; | ||
388 | rootObject = B9ADC6B1158CFD36007EF999 /* Project object */; | ||
389 | } | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.h b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.h new file mode 100644 index 0000000..27c5229 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.h | |||
@@ -0,0 +1,15 @@ | |||
1 | // | ||
2 | // Xd3iOSAppDelegate.h | ||
3 | // xdelta3-ios-test | ||
4 | // | ||
5 | // Created by Joshua MacDonald on 6/16/12. | ||
6 | // Copyright (c) 2011, 2012 Joshua MacDonald. All rights reserved. | ||
7 | // | ||
8 | |||
9 | #import <UIKit/UIKit.h> | ||
10 | |||
11 | @interface Xd3iOSAppDelegate : UIResponder <UIApplicationDelegate> | ||
12 | |||
13 | @property (strong, nonatomic) UIWindow *window; | ||
14 | |||
15 | @end | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.m b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.m new file mode 100644 index 0000000..ad3fd8a --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSAppDelegate.m | |||
@@ -0,0 +1,60 @@ | |||
1 | // | ||
2 | // Xd3iOSAppDelegate.m | ||
3 | // xdelta3-ios-test | ||
4 | // | ||
5 | // Created by Joshua MacDonald on 6/16/12. | ||
6 | // Copyright (c) 2011, 2012 Joshua MacDonald. All rights reserved. | ||
7 | // | ||
8 | |||
9 | #import "Xd3iOSAppDelegate.h" | ||
10 | |||
11 | @implementation Xd3iOSAppDelegate | ||
12 | |||
13 | @synthesize window = _window; | ||
14 | |||
15 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions | ||
16 | { | ||
17 | // Override point for customization after application launch. | ||
18 | return YES; | ||
19 | } | ||
20 | |||
21 | - (void)applicationWillResignActive:(UIApplication *)application | ||
22 | { | ||
23 | /* | ||
24 | Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. | ||
25 | Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. | ||
26 | */ | ||
27 | } | ||
28 | |||
29 | - (void)applicationDidEnterBackground:(UIApplication *)application | ||
30 | { | ||
31 | /* | ||
32 | Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. | ||
33 | If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. | ||
34 | */ | ||
35 | } | ||
36 | |||
37 | - (void)applicationWillEnterForeground:(UIApplication *)application | ||
38 | { | ||
39 | /* | ||
40 | Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background. | ||
41 | */ | ||
42 | } | ||
43 | |||
44 | - (void)applicationDidBecomeActive:(UIApplication *)application | ||
45 | { | ||
46 | /* | ||
47 | Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. | ||
48 | */ | ||
49 | } | ||
50 | |||
51 | - (void)applicationWillTerminate:(UIApplication *)application | ||
52 | { | ||
53 | /* | ||
54 | Called when the application is about to terminate. | ||
55 | Save data if appropriate. | ||
56 | See also applicationDidEnterBackground:. | ||
57 | */ | ||
58 | } | ||
59 | |||
60 | @end | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.h b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.h new file mode 100644 index 0000000..700f7f4 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.h | |||
@@ -0,0 +1,20 @@ | |||
1 | // | ||
2 | // Xd3iOSViewController.h | ||
3 | // xdelta3-ios-test | ||
4 | // | ||
5 | // Created by Joshua MacDonald on 6/16/12. | ||
6 | // Copyright (c) 2011, 2012 Joshua MacDonald. All rights reserved. | ||
7 | // | ||
8 | |||
9 | #import <UIKit/UIKit.h> | ||
10 | |||
11 | @interface Xd3iOSViewController : UIViewController <UITextViewDelegate> { | ||
12 | NSString *inputSeed; | ||
13 | } | ||
14 | - (IBAction)startTest:(id)sender; | ||
15 | @property (weak, nonatomic) IBOutlet UITextField *theSeed; | ||
16 | @property (weak, nonatomic) IBOutlet UITextView *theView; | ||
17 | @property (atomic, retain) NSMutableString *theOutput; | ||
18 | @property (nonatomic) BOOL inTest; | ||
19 | |||
20 | @end | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.m b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.m new file mode 100644 index 0000000..a874aca --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/Xd3iOSViewController.m | |||
@@ -0,0 +1,169 @@ | |||
1 | // | ||
2 | // Xd3iOSViewController.m | ||
3 | // xdelta3-ios-test | ||
4 | // | ||
5 | // Created by Joshua MacDonald on 6/16/12. | ||
6 | // Copyright (c) 2011, 2012 Joshua MacDonald. All rights reserved. | ||
7 | // | ||
8 | |||
9 | #import "Xd3iOSViewController.h" | ||
10 | #include "xdelta3.h" | ||
11 | #include "dispatch/queue.h" | ||
12 | #include "Foundation/NSBundle.h" | ||
13 | |||
14 | extern void (*xprintf_message_func)(const char* msg); | ||
15 | void print_to_view(const char* buf); | ||
16 | int xd3_main_cmdline(int argc, char **argv); | ||
17 | void do_localfile_test(void); | ||
18 | int compare_files(const char* file1, const char* file2); | ||
19 | Xd3iOSViewController *static_ptr; | ||
20 | |||
21 | @implementation Xd3iOSViewController | ||
22 | @synthesize theSeed = _theSeed; | ||
23 | @synthesize theView = _theView; | ||
24 | @synthesize theOutput = _theOutput; | ||
25 | @synthesize inTest = _inTest; | ||
26 | |||
27 | - (void)didReceiveMemoryWarning | ||
28 | { | ||
29 | [super didReceiveMemoryWarning]; | ||
30 | } | ||
31 | |||
32 | #pragma mark - View lifecycle | ||
33 | |||
34 | - (void)viewDidLoad | ||
35 | { | ||
36 | [super viewDidLoad]; | ||
37 | } | ||
38 | |||
39 | - (void)viewDidUnload | ||
40 | { | ||
41 | [self setTheSeed:nil]; | ||
42 | [self setTheView:nil]; | ||
43 | [self setTheView:nil]; | ||
44 | [super viewDidUnload]; | ||
45 | } | ||
46 | |||
47 | - (void)viewWillAppear:(BOOL)animated | ||
48 | { | ||
49 | [super viewWillAppear:animated]; | ||
50 | } | ||
51 | |||
52 | - (void)viewDidAppear:(BOOL)animated | ||
53 | { | ||
54 | [super viewDidAppear:animated]; | ||
55 | } | ||
56 | |||
57 | - (void)viewWillDisappear:(BOOL)animated | ||
58 | { | ||
59 | [super viewWillDisappear:animated]; | ||
60 | } | ||
61 | |||
62 | - (void)viewDidDisappear:(BOOL)animated | ||
63 | { | ||
64 | [super viewDidDisappear:animated]; | ||
65 | } | ||
66 | |||
67 | - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation | ||
68 | { | ||
69 | switch (interfaceOrientation) { | ||
70 | case UIInterfaceOrientationPortrait: | ||
71 | case UIInterfaceOrientationPortraitUpsideDown: | ||
72 | return YES; | ||
73 | default: | ||
74 | break; | ||
75 | } | ||
76 | return NO; | ||
77 | } | ||
78 | - (BOOL)textFieldShouldReturn:(UITextField*)theTextField { | ||
79 | if (theTextField == self.theSeed) { | ||
80 | [theTextField resignFirstResponder]; | ||
81 | } | ||
82 | return YES; | ||
83 | } | ||
84 | - (IBAction)startTest:(id)sender { | ||
85 | if (self.inTest) { | ||
86 | return; | ||
87 | } | ||
88 | self.inTest = YES; | ||
89 | NSString *seedString = self.theSeed.text; | ||
90 | if ([seedString length] == 0) { | ||
91 | seedString = @"RFC3284"; | ||
92 | } | ||
93 | static_ptr = self; | ||
94 | xprintf_message_func = &print_to_view; | ||
95 | self.theOutput = [[NSMutableString alloc] initWithFormat:@"Starting test (seed=%@)\n", seedString]; | ||
96 | self.theView.text = self.theOutput; | ||
97 | dispatch_queue_t mq = dispatch_get_main_queue(); | ||
98 | dispatch_queue_t dq = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); | ||
99 | dispatch_async(dq, ^{ | ||
100 | do_localfile_test(); | ||
101 | char *argv[] = { "xdelta3", "test", NULL }; | ||
102 | xd3_main_cmdline(2, argv); | ||
103 | print_to_view("Finished unittest: success"); | ||
104 | dispatch_async(mq, ^{ | ||
105 | self.inTest = NO; | ||
106 | }); | ||
107 | }); | ||
108 | } | ||
109 | |||
110 | void printns_to_view(NSString* ns); | ||
111 | void printns_to_view(NSString* ns) { | ||
112 | dispatch_queue_t mq = dispatch_get_main_queue(); | ||
113 | dispatch_async(mq, ^{ | ||
114 | if ([static_ptr.theOutput length] < 25000) { | ||
115 | [static_ptr.theOutput appendString:ns]; | ||
116 | } else { | ||
117 | static_ptr.theOutput = [[NSMutableString alloc] initWithString:ns]; | ||
118 | } | ||
119 | static_ptr.theView.text = static_ptr.theOutput; | ||
120 | CGSize size = static_ptr.theView.contentSize; | ||
121 | [static_ptr.theView scrollRectToVisible:CGRectMake(0, size.height - 1, 1, 1) animated:NO]; | ||
122 | }); | ||
123 | } | ||
124 | |||
125 | void print_to_view(const char* buf) { | ||
126 | NSString *ns = [NSString stringWithCString:buf encoding:NSASCIIStringEncoding]; | ||
127 | printns_to_view(ns); | ||
128 | } | ||
129 | |||
130 | void do_localfile_test(void) { | ||
131 | NSBundle *bundle; | ||
132 | bundle = [NSBundle mainBundle]; | ||
133 | NSString *localfile1 = [bundle pathForResource:@"file_v1" ofType:@"bin"]; | ||
134 | NSString *localfile2 = [bundle pathForResource:@"file_v2" ofType:@"bin"]; | ||
135 | NSString *localfiled = [bundle pathForResource:@"file_v1_to_v2" ofType:@"bin"]; | ||
136 | printns_to_view([localfile1 stringByAppendingString:@"\n"]); | ||
137 | printns_to_view([localfile2 stringByAppendingString:@"\n"]); | ||
138 | printns_to_view([localfiled stringByAppendingString:@"\n"]); | ||
139 | NSString *tmpdir = NSTemporaryDirectory(); | ||
140 | NSString *tmpfile = [tmpdir stringByAppendingPathComponent:@"delta.tmp"]; | ||
141 | printns_to_view([tmpfile stringByAppendingString:@"\n"]); | ||
142 | char *argv[] = { | ||
143 | "xdelta3", "-dfvv", "-s", | ||
144 | (char*)[localfile1 UTF8String], | ||
145 | (char*)[localfiled UTF8String], | ||
146 | (char*)[tmpfile UTF8String] }; | ||
147 | xd3_main_cmdline(6, argv); | ||
148 | |||
149 | NSFileManager *filemgr; | ||
150 | |||
151 | filemgr = [NSFileManager defaultManager]; | ||
152 | |||
153 | if ([filemgr contentsEqualAtPath: localfile2 andPath: tmpfile] == YES) { | ||
154 | printns_to_view(@"File contents match\n"); | ||
155 | } else { | ||
156 | NSError *err1 = NULL; | ||
157 | NSDictionary *d1 = [filemgr attributesOfItemAtPath: tmpfile error: &err1]; | ||
158 | if (err1 != NULL) { | ||
159 | printns_to_view([@"File localfile2 could not stat %s\n" stringByAppendingString: tmpfile]); | ||
160 | } else { | ||
161 | printns_to_view([@"File contents do not match!!!! tmpfile size=" stringByAppendingString: | ||
162 | [[NSMutableString alloc] initWithFormat:@"%llu\n", [d1 fileSize]]]); | ||
163 | } | ||
164 | compare_files([localfile2 UTF8String], [tmpfile UTF8String]); | ||
165 | } | ||
166 | print_to_view("Finished localfile test.\n"); | ||
167 | } | ||
168 | |||
169 | @end | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/InfoPlist.strings b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/InfoPlist.strings new file mode 100644 index 0000000..477b28f --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/InfoPlist.strings | |||
@@ -0,0 +1,2 @@ | |||
1 | /* Localized versions of Info.plist keys */ | ||
2 | |||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPad.storyboard b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPad.storyboard new file mode 100644 index 0000000..7581bbe --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPad.storyboard | |||
@@ -0,0 +1,77 @@ | |||
1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> | ||
2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="1.0" toolsVersion="1938" systemVersion="11C74" targetRuntime="iOS.CocoaTouch.iPad" propertyAccessControl="none" initialViewController="2"> | ||
3 | <dependencies> | ||
4 | <development defaultVersion="4200" identifier="xcode"/> | ||
5 | <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="933"/> | ||
6 | </dependencies> | ||
7 | <scenes> | ||
8 | <scene sceneID="4"> | ||
9 | <objects> | ||
10 | <placeholder placeholderIdentifier="IBFirstResponder" id="3" sceneMemberID="firstResponder"/> | ||
11 | <viewController id="2" customClass="Xd3iOSViewController" sceneMemberID="viewController"> | ||
12 | <view key="view" contentMode="scaleToFill" id="5"> | ||
13 | <rect key="frame" x="0.0" y="20" width="768" height="1004"/> | ||
14 | <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/> | ||
15 | <subviews> | ||
16 | <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" id="d7Y-KS-zOa"> | ||
17 | <rect key="frame" x="258" y="28" width="197" height="37"/> | ||
18 | <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/> | ||
19 | <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/> | ||
20 | <state key="normal" title="Start test"> | ||
21 | <color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/> | ||
22 | <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/> | ||
23 | </state> | ||
24 | <state key="highlighted"> | ||
25 | <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/> | ||
26 | </state> | ||
27 | <connections> | ||
28 | <action selector="startTest:" destination="2" eventType="touchUpInside" id="f4X-jg-ZsU"/> | ||
29 | </connections> | ||
30 | </button> | ||
31 | <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" placeholder="Random seed" minimumFontSize="17" id="TZ8-OW-wjf"> | ||
32 | <rect key="frame" x="27" y="28" width="197" height="31"/> | ||
33 | <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/> | ||
34 | <fontDescription key="fontDescription" type="system" pointSize="14"/> | ||
35 | <textInputTraits key="textInputTraits" autocorrectionType="no"/> | ||
36 | <connections> | ||
37 | <outlet property="delegate" destination="2" id="hjY-Ym-Fcw"/> | ||
38 | </connections> | ||
39 | </textField> | ||
40 | <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" showsHorizontalScrollIndicator="NO" editable="NO" id="LHz-h6-ZBC"> | ||
41 | <rect key="frame" x="27" y="88" width="721" height="887"/> | ||
42 | <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/> | ||
43 | <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/> | ||
44 | <fontDescription key="fontDescription" type="system" pointSize="14"/> | ||
45 | <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/> | ||
46 | <connections> | ||
47 | <outlet property="delegate" destination="2" id="fwY-fT-bCV"/> | ||
48 | </connections> | ||
49 | </textView> | ||
50 | </subviews> | ||
51 | <color key="backgroundColor" red="0.13337372065218178" green="0.1801924475036723" blue="0.21739130434782605" alpha="1" colorSpace="calibratedRGB"/> | ||
52 | </view> | ||
53 | <connections> | ||
54 | <outlet property="theSeed" destination="TZ8-OW-wjf" id="QuA-uT-5IR"/> | ||
55 | <outlet property="theView" destination="LHz-h6-ZBC" id="s64-32-fBA"/> | ||
56 | </connections> | ||
57 | </viewController> | ||
58 | </objects> | ||
59 | <point key="canvasLocation" x="-601" y="-1021"/> | ||
60 | </scene> | ||
61 | </scenes> | ||
62 | <classes> | ||
63 | <class className="Xd3iOSViewController" superclassName="UIViewController"> | ||
64 | <source key="sourceIdentifier" type="project" relativePath="./Classes/Xd3iOSViewController.h"/> | ||
65 | <relationships> | ||
66 | <relationship kind="action" name="startTest:"/> | ||
67 | <relationship kind="outlet" name="theSeed" candidateClass="UITextField"/> | ||
68 | <relationship kind="outlet" name="theView" candidateClass="UITextView"/> | ||
69 | </relationships> | ||
70 | </class> | ||
71 | </classes> | ||
72 | <simulatedMetricsContainer key="defaultSimulatedMetrics"> | ||
73 | <simulatedStatusBarMetrics key="statusBar" statusBarStyle="blackTranslucent"/> | ||
74 | <simulatedOrientationMetrics key="orientation"/> | ||
75 | <simulatedScreenMetrics key="destination"/> | ||
76 | </simulatedMetricsContainer> | ||
77 | </document> | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPhone.storyboard b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPhone.storyboard new file mode 100644 index 0000000..08b2175 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/en.lproj/MainStoryboard_iPhone.storyboard | |||
@@ -0,0 +1,27 @@ | |||
1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> | ||
2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="1.0" toolsVersion="1906" systemVersion="11A511" targetRuntime="iOS.CocoaTouch" nextObjectID="6" propertyAccessControl="none" initialViewController="2"> | ||
3 | <dependencies> | ||
4 | <development defaultVersion="4200" identifier="xcode"/> | ||
5 | <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="902"/> | ||
6 | </dependencies> | ||
7 | <scenes> | ||
8 | <scene sceneID="5"> | ||
9 | <objects> | ||
10 | <placeholder placeholderIdentifier="IBFirstResponder" id="4" sceneMemberID="firstResponder"/> | ||
11 | <viewController id="2" customClass="Xd3iOSViewController" sceneMemberID="viewController"> | ||
12 | <view key="view" contentMode="scaleToFill" id="3"> | ||
13 | <rect key="frame" x="0.0" y="20" width="320" height="460"/> | ||
14 | <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/> | ||
15 | <subviews/> | ||
16 | <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/> | ||
17 | </view> | ||
18 | </viewController> | ||
19 | </objects> | ||
20 | </scene> | ||
21 | </scenes> | ||
22 | <simulatedMetricsContainer key="defaultSimulatedMetrics"> | ||
23 | <simulatedStatusBarMetrics key="statusBar"/> | ||
24 | <simulatedOrientationMetrics key="orientation"/> | ||
25 | <simulatedScreenMetrics key="destination"/> | ||
26 | </simulatedMetricsContainer> | ||
27 | </document> \ No newline at end of file | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1.bin b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1.bin new file mode 100644 index 0000000..39e0c17 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1.bin | |||
@@ -0,0 +1,1378 @@ | |||
1 | /* xdelta 3 - delta compression tools and library | ||
2 | * Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, | ||
3 | * 2008, 2009, 2010. Joshua P. MacDonald | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; either version 2 of the License, or | ||
8 | * (at your option) any later version. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | * You should have received a copy of the GNU General Public License | ||
16 | * along with this program; if not, write to the Free Software | ||
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
18 | */ | ||
19 | |||
20 | /* To know more about Xdelta, start by reading xdelta3.c. If you are | ||
21 | * ready to use the API, continue reading here. There are two | ||
22 | * interfaces -- xd3_encode_input and xd3_decode_input -- plus a dozen | ||
23 | * or so related calls. This interface is styled after Zlib. */ | ||
24 | |||
25 | #ifndef _XDELTA3_H_ | ||
26 | #define _XDELTA3_H_ | ||
27 | |||
28 | #include <stddef.h> | ||
29 | #include <stdlib.h> | ||
30 | #include <string.h> | ||
31 | #include <sys/types.h> | ||
32 | |||
33 | /****************************************************************/ | ||
34 | |||
35 | /* Default configured value of stream->winsize. If the program | ||
36 | * supplies xd3_encode_input() with data smaller than winsize the | ||
37 | * stream will automatically buffer the input, otherwise the input | ||
38 | * buffer is used directly. | ||
39 | */ | ||
40 | #ifndef XD3_DEFAULT_WINSIZE | ||
41 | #define XD3_DEFAULT_WINSIZE (1U << 23) | ||
42 | #endif | ||
43 | |||
44 | /* Default total size of the source window used in xdelta3-main.h */ | ||
45 | #ifndef XD3_DEFAULT_SRCWINSZ | ||
46 | #define XD3_DEFAULT_SRCWINSZ (1U << 26) | ||
47 | #endif | ||
48 | |||
49 | /* When Xdelta requests a memory allocation for certain buffers, it | ||
50 | * rounds up to units of at least this size. The code assumes (and | ||
51 | * asserts) that this is a power-of-two. */ | ||
52 | #ifndef XD3_ALLOCSIZE | ||
53 | #define XD3_ALLOCSIZE (1U<<14) | ||
54 | #endif | ||
55 | |||
56 | /* The XD3_HARDMAXWINSIZE parameter is a safety mechanism to protect | ||
57 | * decoders against malicious files. The decoder will never decode a | ||
58 | * window larger than this. If the file specifies VCD_TARGET the | ||
59 | * decoder may require two buffers of this size. | ||
60 | * | ||
61 | * 8-16MB is reasonable, probably don't need to go larger. */ | ||
62 | #ifndef XD3_HARDMAXWINSIZE | ||
63 | #define XD3_HARDMAXWINSIZE (1U<<24) | ||
64 | #endif | ||
65 | /* The IOPT_SIZE value sets the size of a buffer used to batch | ||
66 | * overlapping copy instructions before they are optimized by picking | ||
67 | * the best non-overlapping ranges. The larger this buffer, the | ||
68 | * longer a forced xd3_srcwin_setup() decision is held off. Setting | ||
69 | * this value to 0 causes an unlimited buffer to be used. */ | ||
70 | #ifndef XD3_DEFAULT_IOPT_SIZE | ||
71 | #define XD3_DEFAULT_IOPT_SIZE (1U<<15) | ||
72 | #endif | ||
73 | |||
74 | /* The maximum distance backward to search for small matches */ | ||
75 | #ifndef XD3_DEFAULT_SPREVSZ | ||
76 | #define XD3_DEFAULT_SPREVSZ (1U<<18) | ||
77 | #endif | ||
78 | |||
79 | /* The default compression level | ||
80 | */ | ||
81 | #ifndef XD3_DEFAULT_LEVEL | ||
82 | #define XD3_DEFAULT_LEVEL 3 | ||
83 | #endif | ||
84 | |||
85 | #ifndef XD3_DEFAULT_SECONDARY_LEVEL | ||
86 | #define XD3_DEFAULT_SECONDARY_LEVEL 6 | ||
87 | #endif | ||
88 | |||
89 | #ifndef XD3_USE_LARGEFILE64 | ||
90 | #define XD3_USE_LARGEFILE64 1 | ||
91 | #endif | ||
92 | |||
93 | /* Sizes and addresses within VCDIFF windows are represented as usize_t | ||
94 | * | ||
95 | * For source-file offsets and total file sizes, total input and | ||
96 | * output counts, the xoff_t type is used. The decoder and encoder | ||
97 | * generally check for overflow of the xoff_t size (this is tested at | ||
98 | * the 32bit boundary [xdelta3-test.h]). | ||
99 | */ | ||
100 | #ifndef _WIN32 | ||
101 | #include <stdint.h> | ||
102 | typedef unsigned int usize_t; | ||
103 | #else | ||
104 | #define WIN32_LEAN_AND_MEAN | ||
105 | #if XD3_USE_LARGEFILE64 | ||
106 | /* 64 bit file offsets: uses GetFileSizeEx and SetFilePointerEx. | ||
107 | * requires Win2000 or newer version of WinNT */ | ||
108 | #define WINVER 0x0500 | ||
109 | #define _WIN32_WINNT 0x0500 | ||
110 | #else | ||
111 | /* 32 bit (DWORD) file offsets: uses GetFileSize and | ||
112 | * SetFilePointer. compatible with win9x-me and WinNT4 */ | ||
113 | #define WINVER 0x0400 | ||
114 | #define _WIN32_WINNT 0x0400 | ||
115 | #endif | ||
116 | #include <windows.h> | ||
117 | typedef unsigned int usize_t; | ||
118 | #ifdef _MSC_VER | ||
119 | #define inline | ||
120 | typedef signed int ssize_t; | ||
121 | typedef unsigned char uint8_t; | ||
122 | typedef unsigned short uint16_t; | ||
123 | typedef unsigned long uint32_t; | ||
124 | typedef ULONGLONG uint64_t; | ||
125 | #else | ||
126 | /* mingw32, lcc and watcom provide a proper header */ | ||
127 | #include <stdint.h> | ||
128 | #endif | ||
129 | #endif | ||
130 | |||
131 | /* TODO: note that SIZEOF_USIZE_T is never set to 8, although it should be for | ||
132 | * a 64bit platform. OTOH, may be that using 32bits is appropriate even on a | ||
133 | * 64bit platform because we allocate large arrays of these values. */ | ||
134 | #if XD3_USE_LARGEFILE64 | ||
135 | #define __USE_FILE_OFFSET64 1 /* GLIBC: for 64bit fileops, ... ? */ | ||
136 | #ifndef _LARGEFILE_SOURCE | ||
137 | #define _LARGEFILE_SOURCE | ||
138 | #endif | ||
139 | #ifndef _FILE_OFFSET_BITS | ||
140 | #define _FILE_OFFSET_BITS 64 | ||
141 | #endif | ||
142 | |||
143 | typedef uint64_t xoff_t; | ||
144 | #define SIZEOF_XOFF_T 8 | ||
145 | #define SIZEOF_USIZE_T 4 | ||
146 | #ifndef WIN32 | ||
147 | #define Q "ll" | ||
148 | #else | ||
149 | #define Q "I64" | ||
150 | #endif | ||
151 | #else | ||
152 | typedef uint32_t xoff_t; | ||
153 | #define SIZEOF_XOFF_T 4 | ||
154 | #define SIZEOF_USIZE_T 4 | ||
155 | #define Q | ||
156 | #endif | ||
157 | |||
158 | #define USE_UINT32 (SIZEOF_USIZE_T == 4 || \ | ||
159 | SIZEOF_XOFF_T == 4 || REGRESSION_TEST) | ||
160 | #define USE_UINT64 (SIZEOF_USIZE_T == 8 || \ | ||
161 | SIZEOF_XOFF_T == 8 || REGRESSION_TEST) | ||
162 | |||
163 | /* TODO: probably should do something better here. */ | ||
164 | #ifndef UNALIGNED_OK | ||
165 | #if defined(__i386__) || defined(__i486__) || defined(__i586__) || \ | ||
166 | defined(__i686__) || defined(_X86_) || defined(__x86_64__) | ||
167 | #define UNALIGNED_OK 1 | ||
168 | #else | ||
169 | #define UNALIGNED_OK 0 | ||
170 | #endif | ||
171 | #endif | ||
172 | |||
173 | /**********************************************************************/ | ||
174 | |||
175 | /* Whether to build the encoder, otherwise only build the decoder. */ | ||
176 | #ifndef XD3_ENCODER | ||
177 | #define XD3_ENCODER 1 | ||
178 | #endif | ||
179 | |||
180 | /* The code returned when main() fails, also defined in system | ||
181 | includes. */ | ||
182 | #ifndef EXIT_FAILURE | ||
183 | #define EXIT_FAILURE 1 | ||
184 | #endif | ||
185 | |||
186 | /* REGRESSION TEST enables the "xdelta3 test" command, which runs a | ||
187 | series of self-tests. */ | ||
188 | #ifndef REGRESSION_TEST | ||
189 | #define REGRESSION_TEST 0 | ||
190 | #endif | ||
191 | |||
192 | /* XD3_DEBUG=1 enables assertions and various statistics. Levels > 1 | ||
193 | * enable some additional output only useful during development and | ||
194 | * debugging. */ | ||
195 | #ifndef XD3_DEBUG | ||
196 | #define XD3_DEBUG 0 | ||
197 | #endif | ||
198 | |||
199 | #ifndef PYTHON_MODULE | ||
200 | #define PYTHON_MODULE 0 | ||
201 | #endif | ||
202 | |||
203 | #ifndef SWIG_MODULE | ||
204 | #define SWIG_MODULE 0 | ||
205 | #endif | ||
206 | |||
207 | /* There are three string matching functions supplied: one fast, one | ||
208 | * slow (default), and one soft-configurable. To disable any of | ||
209 | * these, use the following definitions. */ | ||
210 | #ifndef XD3_BUILD_SLOW | ||
211 | #define XD3_BUILD_SLOW 1 | ||
212 | #endif | ||
213 | #ifndef XD3_BUILD_FAST | ||
214 | #define XD3_BUILD_FAST 1 | ||
215 | #endif | ||
216 | #ifndef XD3_BUILD_FASTER | ||
217 | #define XD3_BUILD_FASTER 1 | ||
218 | #endif | ||
219 | #ifndef XD3_BUILD_FASTEST | ||
220 | #define XD3_BUILD_FASTEST 1 | ||
221 | #endif | ||
222 | #ifndef XD3_BUILD_SOFT | ||
223 | #define XD3_BUILD_SOFT 1 | ||
224 | #endif | ||
225 | #ifndef XD3_BUILD_DEFAULT | ||
226 | #define XD3_BUILD_DEFAULT 1 | ||
227 | #endif | ||
228 | |||
229 | #if XD3_DEBUG | ||
230 | #include <stdio.h> | ||
231 | #endif | ||
232 | |||
233 | /* XPRINT. Debug output and VCDIFF_TOOLS functions report to stderr. | ||
234 | * I have used an irregular style to abbreviate [fprintf(stderr, "] as | ||
235 | * [DP(RINT "]. */ | ||
236 | #define DP fprintf | ||
237 | #define RINT stderr, | ||
238 | |||
239 | typedef struct _xd3_stream xd3_stream; | ||
240 | typedef struct _xd3_source xd3_source; | ||
241 | typedef struct _xd3_hash_cfg xd3_hash_cfg; | ||
242 | typedef struct _xd3_smatcher xd3_smatcher; | ||
243 | typedef struct _xd3_rinst xd3_rinst; | ||
244 | typedef struct _xd3_dinst xd3_dinst; | ||
245 | typedef struct _xd3_hinst xd3_hinst; | ||
246 | typedef struct _xd3_winst xd3_winst; | ||
247 | typedef struct _xd3_rpage xd3_rpage; | ||
248 | typedef struct _xd3_addr_cache xd3_addr_cache; | ||
249 | typedef struct _xd3_output xd3_output; | ||
250 | typedef struct _xd3_desect xd3_desect; | ||
251 | typedef struct _xd3_iopt_buflist xd3_iopt_buflist; | ||
252 | typedef struct _xd3_rlist xd3_rlist; | ||
253 | typedef struct _xd3_sec_type xd3_sec_type; | ||
254 | typedef struct _xd3_sec_cfg xd3_sec_cfg; | ||
255 | typedef struct _xd3_sec_stream xd3_sec_stream; | ||
256 | typedef struct _xd3_config xd3_config; | ||
257 | typedef struct _xd3_code_table_desc xd3_code_table_desc; | ||
258 | typedef struct _xd3_code_table_sizes xd3_code_table_sizes; | ||
259 | typedef struct _xd3_slist xd3_slist; | ||
260 | typedef struct _xd3_whole_state xd3_whole_state; | ||
261 | typedef struct _xd3_wininfo xd3_wininfo; | ||
262 | |||
263 | /* The stream configuration has three callbacks functions, all of | ||
264 | * which may be supplied with NULL values. If config->getblk is | ||
265 | * provided as NULL, the stream returns XD3_GETSRCBLK. */ | ||
266 | |||
267 | typedef void* (xd3_alloc_func) (void *opaque, | ||
268 | usize_t items, | ||
269 | usize_t size); | ||
270 | typedef void (xd3_free_func) (void *opaque, | ||
271 | void *address); | ||
272 | |||
273 | typedef int (xd3_getblk_func) (xd3_stream *stream, | ||
274 | xd3_source *source, | ||
275 | xoff_t blkno); | ||
276 | |||
277 | /* These are internal functions to delay construction of encoding | ||
278 | * tables and support alternate code tables. See the comments & code | ||
279 | * enabled by GENERIC_ENCODE_TABLES. */ | ||
280 | |||
281 | typedef const xd3_dinst* (xd3_code_table_func) (void); | ||
282 | typedef int (xd3_comp_table_func) (xd3_stream *stream, | ||
283 | const uint8_t **data, | ||
284 | usize_t *size); | ||
285 | |||
286 | |||
287 | |||
288 | #if XD3_DEBUG | ||
289 | #define XD3_ASSERT(x) \ | ||
290 | do { if (! (x)) { DP(RINT "%s:%d: XD3 assertion failed: %s\n", __FILE__, __LINE__, #x); \ | ||
291 | abort (); } } while (0) | ||
292 | #else | ||
293 | #define XD3_ASSERT(x) (void)0 | ||
294 | #endif /* XD3_DEBUG */ | ||
295 | |||
296 | #ifdef __GNUC__ | ||
297 | #ifndef max | ||
298 | #define max(x,y) ({ \ | ||
299 | const typeof(x) _x = (x); \ | ||
300 | const typeof(y) _y = (y); \ | ||
301 | (void) (&_x == &_y); \ | ||
302 | _x > _y ? _x : _y; }) | ||
303 | #endif /* __GNUC__ */ | ||
304 | |||
305 | #ifndef min | ||
306 | #define min(x,y) ({ \ | ||
307 | const typeof(x) _x = (x); \ | ||
308 | const typeof(y) _y = (y); \ | ||
309 | (void) (&_x == &_y); \ | ||
310 | _x < _y ? _x : _y; }) | ||
311 | #endif | ||
312 | #else /* __GNUC__ */ | ||
313 | #ifndef max | ||
314 | #define max(x,y) ((x) < (y) ? (y) : (x)) | ||
315 | #endif | ||
316 | #ifndef min | ||
317 | #define min(x,y) ((x) < (y) ? (x) : (y)) | ||
318 | #endif | ||
319 | #endif /* __GNUC__ */ | ||
320 | |||
321 | /**************************************************************** | ||
322 | PUBLIC ENUMS | ||
323 | ******************************************************************/ | ||
324 | |||
325 | /* These are the five ordinary status codes returned by the | ||
326 | * xd3_encode_input() and xd3_decode_input() state machines. */ | ||
327 | typedef enum { | ||
328 | |||
329 | /* An application must be prepared to handle these five return | ||
330 | * values from either xd3_encode_input or xd3_decode_input, except | ||
331 | * in the case of no-source compression, in which case XD3_GETSRCBLK | ||
332 | * is never returned. More detailed comments for these are given in | ||
333 | * xd3_encode_input and xd3_decode_input comments, below. */ | ||
334 | XD3_INPUT = -17703, /* need input */ | ||
335 | XD3_OUTPUT = -17704, /* have output */ | ||
336 | XD3_GETSRCBLK = -17705, /* need a block of source input (with no | ||
337 | * xd3_getblk function), a chance to do | ||
338 | * non-blocking read. */ | ||
339 | XD3_GOTHEADER = -17706, /* (decode-only) after the initial VCDIFF & | ||
340 | first window header */ | ||
341 | XD3_WINSTART = -17707, /* notification: returned before a window is | ||
342 | * processed, giving a chance to | ||
343 | * XD3_SKIP_WINDOW or not XD3_SKIP_EMIT that | ||
344 | * window. */ | ||
345 | XD3_WINFINISH = -17708, /* notification: returned after | ||
346 | encode/decode & output for a window */ | ||
347 | XD3_TOOFARBACK = -17709, /* (encoder only) may be returned by | ||
348 | getblk() if the block is too old */ | ||
349 | XD3_INTERNAL = -17710, /* internal error */ | ||
350 | XD3_INVALID = -17711, /* invalid config */ | ||
351 | XD3_INVALID_INPUT = -17712, /* invalid input/decoder error */ | ||
352 | XD3_NOSECOND = -17713, /* when secondary compression finds no | ||
353 | improvement. */ | ||
354 | XD3_UNIMPLEMENTED = -17714, /* currently VCD_TARGET */ | ||
355 | } xd3_rvalues; | ||
356 | |||
357 | /* special values in config->flags */ | ||
358 | typedef enum | ||
359 | { | ||
360 | XD3_JUST_HDR = (1 << 1), /* used by VCDIFF tools, see | ||
361 | xdelta3-main.h. */ | ||
362 | XD3_SKIP_WINDOW = (1 << 2), /* used by VCDIFF tools, see | ||
363 | xdelta3-main.h. */ | ||
364 | XD3_SKIP_EMIT = (1 << 3), /* used by VCDIFF tools, see | ||
365 | xdelta3-main.h. */ | ||
366 | XD3_FLUSH = (1 << 4), /* flush the stream buffer to | ||
367 | prepare for | ||
368 | xd3_stream_close(). */ | ||
369 | |||
370 | XD3_SEC_DJW = (1 << 5), /* use DJW static huffman */ | ||
371 | XD3_SEC_FGK = (1 << 6), /* use FGK adaptive huffman */ | ||
372 | XD3_SEC_TYPE = (XD3_SEC_DJW | XD3_SEC_FGK), | ||
373 | |||
374 | XD3_SEC_NODATA = (1 << 7), /* disable secondary compression of | ||
375 | the data section. */ | ||
376 | XD3_SEC_NOINST = (1 << 8), /* disable secondary compression of | ||
377 | the inst section. */ | ||
378 | XD3_SEC_NOADDR = (1 << 9), /* disable secondary compression of | ||
379 | the addr section. */ | ||
380 | |||
381 | XD3_SEC_NOALL = (XD3_SEC_NODATA | XD3_SEC_NOINST | XD3_SEC_NOADDR), | ||
382 | |||
383 | XD3_ADLER32 = (1 << 10), /* enable checksum computation in | ||
384 | the encoder. */ | ||
385 | XD3_ADLER32_NOVER = (1 << 11), /* disable checksum verification in | ||
386 | the decoder. */ | ||
387 | |||
388 | XD3_ALT_CODE_TABLE = (1 << 12), /* for testing th | ||
389 | e alternate code table encoding. */ | ||
390 | |||
391 | XD3_NOCOMPRESS = (1 << 13), /* disable ordinary data | ||
392 | * compression feature, only search | ||
393 | * the source, not the target. */ | ||
394 | XD3_BEGREEDY = (1 << 14), /* disable the "1.5-pass | ||
395 | * algorithm", instead use greedy | ||
396 | * matching. Greedy is off by | ||
397 | * default. */ | ||
398 | XD3_ADLER32_RECODE = (1 << 15), /* used by "recode". */ | ||
399 | |||
400 | /* 4 bits to set the compression level the same as the command-line | ||
401 | * setting -1 through -9 (-0 corresponds to the XD3_NOCOMPRESS flag, | ||
402 | * and is independent of compression level). This is for | ||
403 | * convenience, especially with xd3_encode_memory(). */ | ||
404 | |||
405 | XD3_COMPLEVEL_SHIFT = 20, /* 20 - 24 */ | ||
406 | XD3_COMPLEVEL_MASK = (0xF << XD3_COMPLEVEL_SHIFT), | ||
407 | XD3_COMPLEVEL_1 = (1 << XD3_COMPLEVEL_SHIFT), | ||
408 | XD3_COMPLEVEL_2 = (2 << XD3_COMPLEVEL_SHIFT), | ||
409 | XD3_COMPLEVEL_3 = (3 << XD3_COMPLEVEL_SHIFT), | ||
410 | XD3_COMPLEVEL_6 = (6 << XD3_COMPLEVEL_SHIFT), | ||
411 | XD3_COMPLEVEL_9 = (9 << XD3_COMPLEVEL_SHIFT), | ||
412 | |||
413 | } xd3_flags; | ||
414 | |||
415 | /* The values of this enumeration are set in xd3_config using the | ||
416 | * smatch_cfg variable. It can be set to default, slow, fast, etc., | ||
417 | * and soft. */ | ||
418 | typedef enum | ||
419 | { | ||
420 | XD3_SMATCH_DEFAULT = 0, /* Flags may contain XD3_COMPLEVEL bits, | ||
421 | else default. */ | ||
422 | XD3_SMATCH_SLOW = 1, | ||
423 | XD3_SMATCH_FAST = 2, | ||
424 | XD3_SMATCH_FASTER = 3, | ||
425 | XD3_SMATCH_FASTEST = 4, | ||
426 | XD3_SMATCH_SOFT = 5, | ||
427 | } xd3_smatch_cfg; | ||
428 | |||
429 | /********************************************************************* | ||
430 | PRIVATE ENUMS | ||
431 | **********************************************************************/ | ||
432 | |||
433 | /* stream->match_state is part of the xd3_encode_input state machine | ||
434 | * for source matching: | ||
435 | * | ||
436 | * 1. the XD3_GETSRCBLK block-read mechanism means reentrant matching | ||
437 | * 2. this state spans encoder windows: a match and end-of-window | ||
438 | * will continue in the next 3. the initial target byte and source | ||
439 | * byte are a presumed match, to avoid some computation in case the | ||
440 | * inputs are identical. | ||
441 | */ | ||
442 | typedef enum { | ||
443 | |||
444 | MATCH_TARGET = 0, /* in this state, attempt to match the start of | ||
445 | * the target with the previously set source | ||
446 | * address (initially 0). */ | ||
447 | MATCH_BACKWARD = 1, /* currently expanding a match backward in the | ||
448 | source/target. */ | ||
449 | MATCH_FORWARD = 2, /* currently expanding a match forward in the | ||
450 | source/target. */ | ||
451 | MATCH_SEARCHING = 3, /* currently searching for a match. */ | ||
452 | |||
453 | } xd3_match_state; | ||
454 | |||
455 | /* The xd3_encode_input state machine steps through these states in | ||
456 | * the following order. The matcher is reentrant and returns | ||
457 | * XD3_INPUT whenever it requires more data. After receiving | ||
458 | * XD3_INPUT, if the application reads EOF it should call | ||
459 | * xd3_stream_close(). | ||
460 | */ | ||
461 | typedef enum { | ||
462 | |||
463 | ENC_INIT = 0, /* xd3_encode_input has never been called. */ | ||
464 | ENC_INPUT = 1, /* waiting for xd3_avail_input () to be called. */ | ||
465 | ENC_SEARCH = 2, /* currently searching for matches. */ | ||
466 | ENC_INSTR = 3, /* currently formatting output. */ | ||
467 | ENC_FLUSH = 4, /* currently emitting output. */ | ||
468 | ENC_POSTOUT = 5, /* after an output section. */ | ||
469 | ENC_POSTWIN = 6, /* after all output sections. */ | ||
470 | ENC_ABORTED = 7, /* abort. */ | ||
471 | } xd3_encode_state; | ||
472 | |||
473 | /* The xd3_decode_input state machine steps through these states in | ||
474 | * the following order. The matcher is reentrant and returns | ||
475 | * XD3_INPUT whenever it requires more data. After receiving | ||
476 | * XD3_INPUT, if the application reads EOF it should call | ||
477 | * xd3_stream_close(). | ||
478 | * | ||
479 | * 0-8: the VCDIFF header | ||
480 | * 9-18: the VCDIFF window header | ||
481 | * 19-21: the three primary sections: data, inst, addr | ||
482 | * 22: producing output: returns XD3_OUTPUT, possibly XD3_GETSRCBLK, | ||
483 | * 23: return XD3_WINFINISH, set state=9 to decode more input | ||
484 | */ | ||
485 | typedef enum { | ||
486 | |||
487 | DEC_VCHEAD = 0, /* VCDIFF header */ | ||
488 | DEC_HDRIND = 1, /* header indicator */ | ||
489 | |||
490 | DEC_SECONDID = 2, /* secondary compressor ID */ | ||
491 | |||
492 | DEC_TABLEN = 3, /* code table length */ | ||
493 | DEC_NEAR = 4, /* code table near */ | ||
494 | DEC_SAME = 5, /* code table same */ | ||
495 | DEC_TABDAT = 6, /* code table data */ | ||
496 | |||
497 | DEC_APPLEN = 7, /* application data length */ | ||
498 | DEC_APPDAT = 8, /* application data */ | ||
499 | |||
500 | DEC_WININD = 9, /* window indicator */ | ||
501 | |||
502 | DEC_CPYLEN = 10, /* copy window length */ | ||
503 | DEC_CPYOFF = 11, /* copy window offset */ | ||
504 | |||
505 | DEC_ENCLEN = 12, /* length of delta encoding */ | ||
506 | DEC_TGTLEN = 13, /* length of target window */ | ||
507 | DEC_DELIND = 14, /* delta indicator */ | ||
508 | |||
509 | DEC_DATALEN = 15, /* length of ADD+RUN data */ | ||
510 | DEC_INSTLEN = 16, /* length of instruction data */ | ||
511 | DEC_ADDRLEN = 17, /* length of address data */ | ||
512 | |||
513 | DEC_CKSUM = 18, /* window checksum */ | ||
514 | |||
515 | DEC_DATA = 19, /* data section */ | ||
516 | DEC_INST = 20, /* instruction section */ | ||
517 | DEC_ADDR = 21, /* address section */ | ||
518 | |||
519 | DEC_EMIT = 22, /* producing data */ | ||
520 | |||
521 | DEC_FINISH = 23, /* window finished */ | ||
522 | |||
523 | DEC_ABORTED = 24, /* xd3_abort_stream */ | ||
524 | } xd3_decode_state; | ||
525 | |||
526 | /************************************************************ | ||
527 | internal types | ||
528 | ************************************************************/ | ||
529 | |||
530 | /* instruction lists used in the IOPT buffer */ | ||
531 | struct _xd3_rlist | ||
532 | { | ||
533 | xd3_rlist *next; | ||
534 | xd3_rlist *prev; | ||
535 | }; | ||
536 | |||
537 | /* the raw encoding of an instruction used in the IOPT buffer */ | ||
538 | struct _xd3_rinst | ||
539 | { | ||
540 | uint8_t type; | ||
541 | uint8_t xtra; | ||
542 | uint8_t code1; | ||
543 | uint8_t code2; | ||
544 | usize_t pos; | ||
545 | usize_t size; | ||
546 | xoff_t addr; | ||
547 | xd3_rlist link; | ||
548 | }; | ||
549 | |||
550 | /* the code-table form of an single- or double-instruction */ | ||
551 | struct _xd3_dinst | ||
552 | { | ||
553 | uint8_t type1; | ||
554 | uint8_t size1; | ||
555 | uint8_t type2; | ||
556 | uint8_t size2; | ||
557 | }; | ||
558 | |||
559 | /* the decoded form of a single (half) instruction. */ | ||
560 | struct _xd3_hinst | ||
561 | { | ||
562 | uint8_t type; | ||
563 | uint32_t size; /* TODO: why decode breaks if this is usize_t? */ | ||
564 | uint32_t addr; /* TODO: why decode breaks if this is usize_t? */ | ||
565 | }; | ||
566 | |||
567 | /* the form of a whole-file instruction */ | ||
568 | struct _xd3_winst | ||
569 | { | ||
570 | uint8_t type; /* RUN, ADD, COPY */ | ||
571 | uint8_t mode; /* 0, VCD_SOURCE, VCD_TARGET */ | ||
572 | usize_t size; | ||
573 | xoff_t addr; | ||
574 | xoff_t position; /* absolute position of this inst */ | ||
575 | }; | ||
576 | |||
577 | /* used by the encoder to buffer output in sections. list of blocks. */ | ||
578 | struct _xd3_output | ||
579 | { | ||
580 | uint8_t *base; | ||
581 | usize_t next; | ||
582 | usize_t avail; | ||
583 | xd3_output *next_page; | ||
584 | }; | ||
585 | |||
586 | /* used by the decoder to buffer input in sections. */ | ||
587 | struct _xd3_desect | ||
588 | { | ||
589 | const uint8_t *buf; | ||
590 | const uint8_t *buf_max; | ||
591 | uint32_t size; /* TODO: why decode breaks if this is usize_t? */ | ||
592 | usize_t pos; | ||
593 | |||
594 | /* used in xdelta3-decode.h */ | ||
595 | uint8_t *copied1; | ||
596 | usize_t alloc1; | ||
597 | |||
598 | /* used in xdelta3-second.h */ | ||
599 | uint8_t *copied2; | ||
600 | usize_t alloc2; | ||
601 | }; | ||
602 | |||
603 | /* the VCDIFF address cache, see the RFC */ | ||
604 | struct _xd3_addr_cache | ||
605 | { | ||
606 | usize_t s_near; | ||
607 | usize_t s_same; | ||
608 | usize_t next_slot; /* the circular index for near */ | ||
609 | usize_t *near_array; /* array of size s_near */ | ||
610 | usize_t *same_array; /* array of size s_same*256 */ | ||
611 | }; | ||
612 | |||
613 | /* the IOPT buffer list is just a list of buffers, which may be allocated | ||
614 | * during encode when using an unlimited buffer. */ | ||
615 | struct _xd3_iopt_buflist | ||
616 | { | ||
617 | xd3_rinst *buffer; | ||
618 | xd3_iopt_buflist *next; | ||
619 | }; | ||
620 | |||
621 | /* This is the record of a pre-compiled configuration, a subset of | ||
622 | xd3_config. */ | ||
623 | struct _xd3_smatcher | ||
624 | { | ||
625 | const char *name; | ||
626 | int (*string_match) (xd3_stream *stream); | ||
627 | usize_t large_look; | ||
628 | usize_t large_step; | ||
629 | usize_t small_look; | ||
630 | usize_t small_chain; | ||
631 | usize_t small_lchain; | ||
632 | usize_t max_lazy; | ||
633 | usize_t long_enough; | ||
634 | }; | ||
635 | |||
636 | /* hash table size & power-of-two hash function. */ | ||
637 | struct _xd3_hash_cfg | ||
638 | { | ||
639 | usize_t size; | ||
640 | usize_t shift; | ||
641 | usize_t mask; | ||
642 | }; | ||
643 | |||
644 | /* the sprev list */ | ||
645 | struct _xd3_slist | ||
646 | { | ||
647 | usize_t last_pos; | ||
648 | }; | ||
649 | |||
650 | /* window info (for whole state) */ | ||
651 | struct _xd3_wininfo { | ||
652 | xoff_t offset; | ||
653 | usize_t length; | ||
654 | uint32_t adler32; | ||
655 | }; | ||
656 | |||
657 | /* whole state for, e.g., merge */ | ||
658 | struct _xd3_whole_state { | ||
659 | usize_t addslen; | ||
660 | uint8_t *adds; | ||
661 | usize_t adds_alloc; | ||
662 | |||
663 | usize_t instlen; | ||
664 | xd3_winst *inst; | ||
665 | usize_t inst_alloc; | ||
666 | |||
667 | usize_t wininfolen; | ||
668 | xd3_wininfo *wininfo; | ||
669 | usize_t wininfo_alloc; | ||
670 | |||
671 | xoff_t length; | ||
672 | }; | ||
673 | |||
674 | /******************************************************************** | ||
675 | public types | ||
676 | *******************************************************************/ | ||
677 | |||
678 | /* Settings for the secondary compressor. */ | ||
679 | struct _xd3_sec_cfg | ||
680 | { | ||
681 | int data_type; /* Which section. (set automatically) */ | ||
682 | usize_t ngroups; /* Number of DJW Huffman groups. */ | ||
683 | usize_t sector_size; /* Sector size. */ | ||
684 | int inefficient; /* If true, ignore efficiency check [avoid XD3_NOSECOND]. */ | ||
685 | }; | ||
686 | |||
687 | /* This is the user-visible stream configuration. */ | ||
688 | struct _xd3_config | ||
689 | { | ||
690 | usize_t winsize; /* The encoder window size. */ | ||
691 | usize_t sprevsz; /* How far back small string | ||
692 | matching goes */ | ||
693 | usize_t iopt_size; /* entries in the | ||
694 | instruction-optimizing | ||
695 | buffer */ | ||
696 | usize_t srcwin_maxsz; /* srcwin_size grows by a factor | ||
697 | of 2 when no matches are | ||
698 | found. encoder will not seek | ||
699 | back further than this. */ | ||
700 | |||
701 | xd3_getblk_func *getblk; /* The three callbacks. */ | ||
702 | xd3_alloc_func *alloc; | ||
703 | xd3_free_func *freef; | ||
704 | void *opaque; /* Not used. */ | ||
705 | int flags; /* stream->flags are initialized | ||
706 | * from xd3_config & never | ||
707 | * modified by the library. Use | ||
708 | * xd3_set_flags to modify flags | ||
709 | * settings mid-stream. */ | ||
710 | |||
711 | xd3_sec_cfg sec_data; /* Secondary compressor config: data */ | ||
712 | xd3_sec_cfg sec_inst; /* Secondary compressor config: inst */ | ||
713 | xd3_sec_cfg sec_addr; /* Secondary compressor config: addr */ | ||
714 | |||
715 | xd3_smatch_cfg smatch_cfg; /* See enum: use fields below for | ||
716 | soft config */ | ||
717 | xd3_smatcher smatcher_soft; | ||
718 | }; | ||
719 | |||
720 | /* The primary source file object. You create one of these objects and | ||
721 | * initialize the first four fields. This library maintains the next | ||
722 | * 5 fields. The configured getblk implementation is responsible for | ||
723 | * setting the final 3 fields when called (and/or when XD3_GETSRCBLK | ||
724 | * is returned). | ||
725 | */ | ||
726 | struct _xd3_source | ||
727 | { | ||
728 | /* you set */ | ||
729 | usize_t blksize; /* block size */ | ||
730 | const char *name; /* its name, for debug/print | ||
731 | purposes */ | ||
732 | void *ioh; /* opaque handle */ | ||
733 | |||
734 | /* getblk sets */ | ||
735 | xoff_t curblkno; /* current block number: client | ||
736 | sets after getblk request */ | ||
737 | usize_t onblk; /* number of bytes on current | ||
738 | block: client sets, must be >= 0 | ||
739 | and <= blksize */ | ||
740 | const uint8_t *curblk; /* current block array: client | ||
741 | sets after getblk request */ | ||
742 | |||
743 | /* xd3 sets */ | ||
744 | usize_t srclen; /* length of this source window */ | ||
745 | xoff_t srcbase; /* offset of this source window | ||
746 | in the source itself */ | ||
747 | int shiftby; /* for power-of-two blocksizes */ | ||
748 | int maskby; /* for power-of-two blocksizes */ | ||
749 | xoff_t cpyoff_blocks; /* offset of dec_cpyoff in blocks */ | ||
750 | usize_t cpyoff_blkoff; /* offset of copy window in | ||
751 | blocks, remainder */ | ||
752 | xoff_t getblkno; /* request block number: xd3 sets | ||
753 | current getblk request */ | ||
754 | |||
755 | /* See xd3_getblk() */ | ||
756 | xoff_t max_blkno; /* Maximum block, if eof is known, | ||
757 | * otherwise, equals frontier_blkno | ||
758 | * (initially 0). */ | ||
759 | xoff_t frontier_blkno; /* If eof is unknown, the next | ||
760 | * source position to be read. | ||
761 | * Otherwise, equal to | ||
762 | * max_blkno. */ | ||
763 | usize_t onlastblk; /* Number of bytes on max_blkno */ | ||
764 | int eof_known; /* Set to true when the first | ||
765 | * partial block is read. */ | ||
766 | }; | ||
767 | |||
768 | /* The primary xd3_stream object, used for encoding and decoding. You | ||
769 | * may access only two fields: avail_out, next_out. Use the methods | ||
770 | * above to operate on xd3_stream. */ | ||
771 | struct _xd3_stream | ||
772 | { | ||
773 | /* input state */ | ||
774 | const uint8_t *next_in; /* next input byte */ | ||
775 | usize_t avail_in; /* number of bytes available at | ||
776 | next_in */ | ||
777 | xoff_t total_in; /* how many bytes in */ | ||
778 | |||
779 | /* output state */ | ||
780 | uint8_t *next_out; /* next output byte */ | ||
781 | usize_t avail_out; /* number of bytes available at | ||
782 | next_out */ | ||
783 | usize_t space_out; /* total out space */ | ||
784 | xoff_t current_window; /* number of windows encoded/decoded */ | ||
785 | xoff_t total_out; /* how many bytes out */ | ||
786 | |||
787 | /* to indicate an error, xd3 sets */ | ||
788 | const char *msg; /* last error message, NULL if | ||
789 | no error */ | ||
790 | |||
791 | /* source configuration */ | ||
792 | xd3_source *src; /* source array */ | ||
793 | |||
794 | /* encoder memory configuration */ | ||
795 | usize_t winsize; /* suggested window size */ | ||
796 | usize_t sprevsz; /* small string, previous window | ||
797 | size (power of 2) */ | ||
798 | usize_t sprevmask; /* small string, previous window | ||
799 | size mask */ | ||
800 | usize_t iopt_size; | ||
801 | usize_t iopt_unlimited; | ||
802 | usize_t srcwin_maxsz; | ||
803 | |||
804 | /* general configuration */ | ||
805 | xd3_getblk_func *getblk; /* set nxtblk, nxtblkno to scanblkno */ | ||
806 | xd3_alloc_func *alloc; /* malloc function */ | ||
807 | xd3_free_func *free; /* free function */ | ||
808 | void* opaque; /* private data object passed to | ||
809 | alloc, free, and getblk */ | ||
810 | int flags; /* various options */ | ||
811 | |||
812 | /* secondary compressor configuration */ | ||
813 | xd3_sec_cfg sec_data; /* Secondary compressor config: data */ | ||
814 | xd3_sec_cfg sec_inst; /* Secondary compressor config: inst */ | ||
815 | xd3_sec_cfg sec_addr; /* Secondary compressor config: addr */ | ||
816 | |||
817 | xd3_smatcher smatcher; | ||
818 | |||
819 | usize_t *large_table; /* table of large checksums */ | ||
820 | xd3_hash_cfg large_hash; /* large hash config */ | ||
821 | |||
822 | usize_t *small_table; /* table of small checksums */ | ||
823 | xd3_slist *small_prev; /* table of previous offsets, | ||
824 | circular linked list */ | ||
825 | int small_reset; /* true if small table should | ||
826 | be reset */ | ||
827 | |||
828 | xd3_hash_cfg small_hash; /* small hash config */ | ||
829 | xd3_addr_cache acache; /* the vcdiff address cache */ | ||
830 | xd3_encode_state enc_state; /* state of the encoder */ | ||
831 | |||
832 | usize_t taroff; /* base offset of the target input */ | ||
833 | usize_t input_position; /* current input position */ | ||
834 | usize_t min_match; /* current minimum match | ||
835 | length, avoids redundent | ||
836 | matches */ | ||
837 | usize_t unencoded_offset; /* current input, first | ||
838 | * unencoded offset. this value | ||
839 | * is <= the first instruction's | ||
840 | * position in the iopt buffer, | ||
841 | * if there is at least one | ||
842 | * match in the buffer. */ | ||
843 | |||
844 | // SRCWIN | ||
845 | // these variables plus srcwin_maxsz above (set by config) | ||
846 | int srcwin_decided; /* boolean: true if srclen and | ||
847 | srcbase have been | ||
848 | decided. */ | ||
849 | int srcwin_decided_early; /* boolean: true if srclen | ||
850 | and srcbase were | ||
851 | decided early. */ | ||
852 | xoff_t srcwin_cksum_pos; /* Source checksum position */ | ||
853 | |||
854 | // MATCH | ||
855 | xd3_match_state match_state; /* encoder match state */ | ||
856 | xoff_t match_srcpos; /* current match source | ||
857 | position relative to | ||
858 | srcbase */ | ||
859 | xoff_t match_last_srcpos; /* previously attempted | ||
860 | * srcpos, to avoid loops. */ | ||
861 | xoff_t match_minaddr; /* smallest matching address to | ||
862 | * set window params (reset each | ||
863 | * window xd3_encode_reset) */ | ||
864 | xoff_t match_maxaddr; /* largest matching address to | ||
865 | * set window params (reset each | ||
866 | * window xd3_encode_reset) */ | ||
867 | usize_t match_back; /* match extends back so far */ | ||
868 | usize_t match_maxback; /* match extends back maximum */ | ||
869 | usize_t match_fwd; /* match extends forward so far */ | ||
870 | usize_t match_maxfwd; /* match extends forward maximum */ | ||
871 | |||
872 | xoff_t maxsrcaddr; /* address of the last source | ||
873 | match (across windows) */ | ||
874 | |||
875 | uint8_t *buf_in; /* for saving buffered input */ | ||
876 | usize_t buf_avail; /* amount of saved input */ | ||
877 | const uint8_t *buf_leftover; /* leftover content of next_in | ||
878 | (i.e., user's buffer) */ | ||
879 | usize_t buf_leftavail; /* amount of leftover content */ | ||
880 | |||
881 | xd3_output *enc_current; /* current output buffer */ | ||
882 | xd3_output *enc_free; /* free output buffers */ | ||
883 | xd3_output *enc_heads[4]; /* array of encoded outputs: | ||
884 | head of chain */ | ||
885 | xd3_output *enc_tails[4]; /* array of encoded outputs: | ||
886 | tail of chain */ | ||
887 | uint32_t recode_adler32; /* set the adler32 checksum | ||
888 | * during "recode". */ | ||
889 | |||
890 | xd3_rlist iopt_used; /* instruction optimizing buffer */ | ||
891 | xd3_rlist iopt_free; | ||
892 | xd3_rinst *iout; /* next single instruction */ | ||
893 | xd3_iopt_buflist *iopt_alloc; | ||
894 | |||
895 | const uint8_t *enc_appheader; /* application header to encode */ | ||
896 | usize_t enc_appheadsz; /* application header size */ | ||
897 | |||
898 | /* decoder stuff */ | ||
899 | xd3_decode_state dec_state; /* current DEC_XXX value */ | ||
900 | usize_t dec_hdr_ind; /* VCDIFF header indicator */ | ||
901 | usize_t dec_win_ind; /* VCDIFF window indicator */ | ||
902 | usize_t dec_del_ind; /* VCDIFF delta indicator */ | ||
903 | |||
904 | uint8_t dec_magic[4]; /* First four bytes */ | ||
905 | usize_t dec_magicbytes; /* Magic position. */ | ||
906 | |||
907 | usize_t dec_secondid; /* Optional secondary compressor ID. */ | ||
908 | |||
909 | /* TODO: why decode breaks if this is usize_t? */ | ||
910 | uint32_t dec_codetblsz; /* Optional code table: length. */ | ||
911 | uint8_t *dec_codetbl; /* Optional code table: storage. */ | ||
912 | usize_t dec_codetblbytes; /* Optional code table: position. */ | ||
913 | |||
914 | /* TODO: why decode breaks if this is usize_t? */ | ||
915 | uint32_t dec_appheadsz; /* Optional application header: | ||
916 | size. */ | ||
917 | uint8_t *dec_appheader; /* Optional application header: | ||
918 | storage */ | ||
919 | usize_t dec_appheadbytes; /* Optional application header: | ||
920 | position. */ | ||
921 | |||
922 | usize_t dec_cksumbytes; /* Optional checksum: position. */ | ||
923 | uint8_t dec_cksum[4]; /* Optional checksum: storage. */ | ||
924 | uint32_t dec_adler32; /* Optional checksum: value. */ | ||
925 | |||
926 | /* TODO: why decode breaks if this is usize_t? */ | ||
927 | uint32_t dec_cpylen; /* length of copy window | ||
928 | (VCD_SOURCE or VCD_TARGET) */ | ||
929 | xoff_t dec_cpyoff; /* offset of copy window | ||
930 | (VCD_SOURCE or VCD_TARGET) */ | ||
931 | /* TODO: why decode breaks if this is usize_t? */ | ||
932 | uint32_t dec_enclen; /* length of delta encoding */ | ||
933 | /* TODO: why decode breaks if this is usize_t? */ | ||
934 | uint32_t dec_tgtlen; /* length of target window */ | ||
935 | |||
936 | #if USE_UINT64 | ||
937 | uint64_t dec_64part; /* part of a decoded uint64_t */ | ||
938 | #endif | ||
939 | #if USE_UINT32 | ||
940 | uint32_t dec_32part; /* part of a decoded uint32_t */ | ||
941 | #endif | ||
942 | |||
943 | xoff_t dec_winstart; /* offset of the start of | ||
944 | current target window */ | ||
945 | xoff_t dec_window_count; /* == current_window + 1 in | ||
946 | DEC_FINISH */ | ||
947 | usize_t dec_winbytes; /* bytes of the three sections | ||
948 | so far consumed */ | ||
949 | usize_t dec_hdrsize; /* VCDIFF + app header size */ | ||
950 | |||
951 | const uint8_t *dec_tgtaddrbase; /* Base of decoded target | ||
952 | addresses (addr >= | ||
953 | dec_cpylen). */ | ||
954 | const uint8_t *dec_cpyaddrbase; /* Base of decoded copy | ||
955 | addresses (addr < | ||
956 | dec_cpylen). */ | ||
957 | |||
958 | usize_t dec_position; /* current decoder position | ||
959 | counting the cpylen | ||
960 | offset */ | ||
961 | usize_t dec_maxpos; /* maximum decoder position | ||
962 | counting the cpylen | ||
963 | offset */ | ||
964 | xd3_hinst dec_current1; /* current instruction */ | ||
965 | xd3_hinst dec_current2; /* current instruction */ | ||
966 | |||
967 | uint8_t *dec_buffer; /* Decode buffer */ | ||
968 | uint8_t *dec_lastwin; /* In case of VCD_TARGET, the | ||
969 | last target window. */ | ||
970 | usize_t dec_lastlen; /* length of the last target | ||
971 | window */ | ||
972 | xoff_t dec_laststart; /* offset of the start of last | ||
973 | target window */ | ||
974 | usize_t dec_lastspace; /* allocated space of last | ||
975 | target window, for reuse */ | ||
976 | |||
977 | xd3_desect inst_sect; /* staging area for decoding | ||
978 | window sections */ | ||
979 | xd3_desect addr_sect; | ||
980 | xd3_desect data_sect; | ||
981 | |||
982 | xd3_code_table_func *code_table_func; | ||
983 | xd3_comp_table_func *comp_table_func; | ||
984 | const xd3_dinst *code_table; | ||
985 | const xd3_code_table_desc *code_table_desc; | ||
986 | xd3_dinst *code_table_alloc; | ||
987 | |||
988 | /* secondary compression */ | ||
989 | const xd3_sec_type *sec_type; | ||
990 | xd3_sec_stream *sec_stream_d; | ||
991 | xd3_sec_stream *sec_stream_i; | ||
992 | xd3_sec_stream *sec_stream_a; | ||
993 | |||
994 | /* state for reconstructing whole files (e.g., for merge), this only | ||
995 | * supports loading USIZE_T_MAX instructions, adds, etc. */ | ||
996 | xd3_whole_state whole_target; | ||
997 | |||
998 | /* statistics */ | ||
999 | xoff_t n_scpy; | ||
1000 | xoff_t n_tcpy; | ||
1001 | xoff_t n_add; | ||
1002 | xoff_t n_run; | ||
1003 | |||
1004 | xoff_t l_scpy; | ||
1005 | xoff_t l_tcpy; | ||
1006 | xoff_t l_add; | ||
1007 | xoff_t l_run; | ||
1008 | |||
1009 | usize_t i_slots_used; | ||
1010 | |||
1011 | #if XD3_DEBUG | ||
1012 | usize_t large_ckcnt; | ||
1013 | |||
1014 | /* memory usage */ | ||
1015 | usize_t alloc_cnt; | ||
1016 | usize_t free_cnt; | ||
1017 | #endif | ||
1018 | }; | ||
1019 | |||
1020 | /************************************************************************** | ||
1021 | PUBLIC FUNCTIONS | ||
1022 | **************************************************************************/ | ||
1023 | |||
1024 | /* This function configures an xd3_stream using the provided in-memory | ||
1025 | * input buffer, source buffer, output buffer, and flags. The output | ||
1026 | * array must be large enough or else ENOSPC will be returned. This | ||
1027 | * is the simplest in-memory encoding interface. */ | ||
1028 | int xd3_encode_memory (const uint8_t *input, | ||
1029 | usize_t input_size, | ||
1030 | const uint8_t *source, | ||
1031 | usize_t source_size, | ||
1032 | uint8_t *output_buffer, | ||
1033 | usize_t *output_size, | ||
1034 | usize_t avail_output, | ||
1035 | int flags); | ||
1036 | |||
1037 | /* The reverse of xd3_encode_memory. */ | ||
1038 | int xd3_decode_memory (const uint8_t *input, | ||
1039 | usize_t input_size, | ||
1040 | const uint8_t *source, | ||
1041 | usize_t source_size, | ||
1042 | uint8_t *output_buf, | ||
1043 | usize_t *output_size, | ||
1044 | usize_t avail_output, | ||
1045 | int flags); | ||
1046 | |||
1047 | /* This function encodes an in-memory input using a pre-configured | ||
1048 | * xd3_stream. This allows the caller to set a variety of options | ||
1049 | * which are not available in the xd3_encode/decode_memory() | ||
1050 | * functions. | ||
1051 | * | ||
1052 | * The output array must be large enough to hold the output or else | ||
1053 | * ENOSPC is returned. The source (if any) should be set using | ||
1054 | * xd3_set_source_and_size() with a single-block xd3_source. This | ||
1055 | * calls the underlying non-blocking interfaces, | ||
1056 | * xd3_encode/decode_input(), handling the necessary input/output | ||
1057 | * states. This method may be considered a reference for any | ||
1058 | * application using xd3_encode_input() directly. | ||
1059 | * | ||
1060 | * xd3_stream stream; | ||
1061 | * xd3_config config; | ||
1062 | * xd3_source src; | ||
1063 | * | ||
1064 | * memset (& src, 0, sizeof (src)); | ||
1065 | * memset (& stream, 0, sizeof (stream)); | ||
1066 | * memset (& config, 0, sizeof (config)); | ||
1067 | * | ||
1068 | * if (source != NULL) | ||
1069 | * { | ||
1070 | * src.size = source_size; | ||
1071 | * src.blksize = source_size; | ||
1072 | * src.curblkno = 0; | ||
1073 | * src.onblk = source_size; | ||
1074 | * src.curblk = source; | ||
1075 | * xd3_set_source(&stream, &src); | ||
1076 | * } | ||
1077 | * | ||
1078 | * config.flags = flags; | ||
1079 | * config.srcwin_maxsz = source_size; | ||
1080 | * config.winsize = input_size; | ||
1081 | * | ||
1082 | * ... set smatcher, appheader, encoding-table, compression-level, etc. | ||
1083 | * | ||
1084 | * xd3_config_stream(&stream, &config); | ||
1085 | * xd3_encode_stream(&stream, ...); | ||
1086 | * xd3_free_stream(&stream); | ||
1087 | */ | ||
1088 | int xd3_encode_stream (xd3_stream *stream, | ||
1089 | const uint8_t *input, | ||
1090 | usize_t input_size, | ||
1091 | uint8_t *output, | ||
1092 | usize_t *output_size, | ||
1093 | usize_t avail_output); | ||
1094 | |||
1095 | /* The reverse of xd3_encode_stream. */ | ||
1096 | int xd3_decode_stream (xd3_stream *stream, | ||
1097 | const uint8_t *input, | ||
1098 | usize_t input_size, | ||
1099 | uint8_t *output, | ||
1100 | usize_t *output_size, | ||
1101 | usize_t avail_size); | ||
1102 | |||
1103 | /* This is the non-blocking interface. | ||
1104 | * | ||
1105 | * Handling input and output states is the same for encoding or | ||
1106 | * decoding using the xd3_avail_input() and xd3_consume_output() | ||
1107 | * routines, inlined below. | ||
1108 | * | ||
1109 | * Return values: | ||
1110 | * | ||
1111 | * XD3_INPUT: the process requires more input: call | ||
1112 | * xd3_avail_input() then repeat | ||
1113 | * | ||
1114 | * XD3_OUTPUT: the process has more output: read stream->next_out, | ||
1115 | * stream->avail_out, then call xd3_consume_output(), | ||
1116 | * then repeat | ||
1117 | * | ||
1118 | * XD3_GOTHEADER: (decoder-only) notification returned following the | ||
1119 | * VCDIFF header and first window header. the decoder | ||
1120 | * may use the header to configure itself. | ||
1121 | * | ||
1122 | * XD3_WINSTART: a general notification returned once for each | ||
1123 | * window except the 0-th window, which is implied by | ||
1124 | * XD3_GOTHEADER. It is recommended to use a | ||
1125 | * switch-stmt such as: | ||
1126 | * | ||
1127 | * ... | ||
1128 | * again: | ||
1129 | * switch ((ret = xd3_decode_input (stream))) { | ||
1130 | * case XD3_GOTHEADER: { | ||
1131 | * assert(stream->current_window == 0); | ||
1132 | * stuff; | ||
1133 | * } | ||
1134 | * // fallthrough | ||
1135 | * case XD3_WINSTART: { | ||
1136 | * something(stream->current_window); | ||
1137 | * goto again; | ||
1138 | * } | ||
1139 | * ... | ||
1140 | * | ||
1141 | * XD3_WINFINISH: a general notification, following the complete | ||
1142 | * input & output of a window. at this point, | ||
1143 | * stream->total_in and stream->total_out are consistent | ||
1144 | * for either encoding or decoding. | ||
1145 | * | ||
1146 | * XD3_GETSRCBLK: If the xd3_getblk() callback is NULL, this value | ||
1147 | * is returned to initiate a non-blocking source read. | ||
1148 | */ | ||
1149 | int xd3_decode_input (xd3_stream *stream); | ||
1150 | int xd3_encode_input (xd3_stream *stream); | ||
1151 | |||
1152 | /* The xd3_config structure is used to initialize a stream - all data | ||
1153 | * is copied into stream so config may be a temporary variable. See | ||
1154 | * the [documentation] or comments on the xd3_config structure. */ | ||
1155 | int xd3_config_stream (xd3_stream *stream, | ||
1156 | xd3_config *config); | ||
1157 | |||
1158 | /* Since Xdelta3 doesn't open any files, xd3_close_stream is just an | ||
1159 | * error check that the stream is in a proper state to be closed: this | ||
1160 | * means the encoder is flushed and the decoder is at a window | ||
1161 | * boundary. The application is responsible for freeing any of the | ||
1162 | * resources it supplied. */ | ||
1163 | int xd3_close_stream (xd3_stream *stream); | ||
1164 | |||
1165 | /* This arranges for closes the stream to succeed. Does not free the | ||
1166 | * stream.*/ | ||
1167 | void xd3_abort_stream (xd3_stream *stream); | ||
1168 | |||
1169 | /* xd3_free_stream frees all memory allocated for the stream. The | ||
1170 | * application is responsible for freeing any of the resources it | ||
1171 | * supplied. */ | ||
1172 | void xd3_free_stream (xd3_stream *stream); | ||
1173 | |||
1174 | /* This function informs the encoder or decoder that source matching | ||
1175 | * (i.e., delta-compression) is possible. For encoding, this should | ||
1176 | * be called before the first xd3_encode_input. A NULL source is | ||
1177 | * ignored. For decoding, this should be called before the first | ||
1178 | * window is decoded, but the appheader may be read first | ||
1179 | * (XD3_GOTHEADER). After decoding the header, call xd3_set_source() | ||
1180 | * if you have a source file. Note: if (stream->dec_win_ind & VCD_SOURCE) | ||
1181 | * is true, it means the first window expects there to be a source file. | ||
1182 | */ | ||
1183 | int xd3_set_source (xd3_stream *stream, | ||
1184 | xd3_source *source); | ||
1185 | |||
1186 | /* If the source size is known, call this instead of xd3_set_source(). | ||
1187 | * to avoid having stream->getblk called (and/or to avoid XD3_GETSRCBLK). | ||
1188 | * | ||
1189 | * Follow these steps: | ||
1190 | xd3_source source; | ||
1191 | memset(&source, 0, sizeof(source)); | ||
1192 | source.blksize = size; | ||
1193 | source.onblk = size; | ||
1194 | source.curblk = buf; | ||
1195 | source.curblkno = 0; | ||
1196 | int ret = xd3_set_source_and_size(&stream, &source, size); | ||
1197 | ... | ||
1198 | */ | ||
1199 | int xd3_set_source_and_size (xd3_stream *stream, | ||
1200 | xd3_source *source, | ||
1201 | xoff_t source_size); | ||
1202 | |||
1203 | /* This should be called before the first call to xd3_encode_input() | ||
1204 | * to include application-specific data in the VCDIFF header. */ | ||
1205 | void xd3_set_appheader (xd3_stream *stream, | ||
1206 | const uint8_t *data, | ||
1207 | usize_t size); | ||
1208 | |||
1209 | /* xd3_get_appheader may be called in the decoder after XD3_GOTHEADER. | ||
1210 | * For convenience, the decoder always adds a single byte padding to | ||
1211 | * the end of the application header, which is set to zero in case the | ||
1212 | * application header is a string. */ | ||
1213 | int xd3_get_appheader (xd3_stream *stream, | ||
1214 | uint8_t **data, | ||
1215 | usize_t *size); | ||
1216 | |||
1217 | /* To generate a VCDIFF encoded delta with xd3_encode_init() from | ||
1218 | * another format, use: | ||
1219 | * | ||
1220 | * xd3_encode_init_partial() -- initialze encoder state (w/o hash tables) | ||
1221 | * xd3_init_cache() -- reset VCDIFF address cache | ||
1222 | * xd3_found_match() -- to report a copy instruction | ||
1223 | * | ||
1224 | * set stream->enc_state to ENC_INSTR and call xd3_encode_input as usual. | ||
1225 | */ | ||
1226 | int xd3_encode_init_partial (xd3_stream *stream); | ||
1227 | void xd3_init_cache (xd3_addr_cache* acache); | ||
1228 | int xd3_found_match (xd3_stream *stream, | ||
1229 | usize_t pos, usize_t size, | ||
1230 | xoff_t addr, int is_source); | ||
1231 | |||
1232 | /* Gives an error string for xdelta3-speficic errors, returns NULL for | ||
1233 | system errors */ | ||
1234 | const char* xd3_strerror (int ret); | ||
1235 | |||
1236 | /* For convenience, zero & initialize the xd3_config structure with | ||
1237 | specified flags. */ | ||
1238 | static inline | ||
1239 | void xd3_init_config (xd3_config *config, | ||
1240 | int flags) | ||
1241 | { | ||
1242 | memset (config, 0, sizeof (*config)); | ||
1243 | config->flags = flags; | ||
1244 | } | ||
1245 | |||
1246 | /* This supplies some input to the stream. | ||
1247 | * | ||
1248 | * For encoding, if the input is larger than the configured window | ||
1249 | * size (xd3_config.winsize), the entire input will be consumed and | ||
1250 | * encoded anyway. If you wish to strictly limit the window size, | ||
1251 | * limit the buffer passed to xd3_avail_input to the window size. | ||
1252 | * | ||
1253 | * For encoding, if the input is smaller than the configured window | ||
1254 | * size (xd3_config.winsize), the library will create a window-sized | ||
1255 | * buffer and accumulate input until a full-sized window can be | ||
1256 | * encoded. XD3_INPUT will be returned. The input must remain valid | ||
1257 | * until the next time xd3_encode_input() returns XD3_INPUT. | ||
1258 | * | ||
1259 | * For decoding, the input will be consumed entirely before XD3_INPUT | ||
1260 | * is returned again. | ||
1261 | */ | ||
1262 | static inline | ||
1263 | void xd3_avail_input (xd3_stream *stream, | ||
1264 | const uint8_t *idata, | ||
1265 | usize_t isize) | ||
1266 | { | ||
1267 | /* Even if isize is zero, the code expects a non-NULL idata. Why? | ||
1268 | * It uses this value to determine whether xd3_avail_input has ever | ||
1269 | * been called. If xd3_encode_input is called before | ||
1270 | * xd3_avail_input it will return XD3_INPUT right away without | ||
1271 | * allocating a stream->winsize buffer. This is to avoid an | ||
1272 | * unwanted allocation. */ | ||
1273 | XD3_ASSERT (idata != NULL || isize == 0); | ||
1274 | |||
1275 | stream->next_in = idata; | ||
1276 | stream->avail_in = isize; | ||
1277 | } | ||
1278 | |||
1279 | /* This acknowledges receipt of output data, must be called after any | ||
1280 | * XD3_OUTPUT return. */ | ||
1281 | static inline | ||
1282 | void xd3_consume_output (xd3_stream *stream) | ||
1283 | { | ||
1284 | stream->avail_out = 0; | ||
1285 | } | ||
1286 | |||
1287 | /* These are set for each XD3_WINFINISH return. */ | ||
1288 | static inline | ||
1289 | int xd3_encoder_used_source (xd3_stream *stream) { | ||
1290 | return stream->src != NULL && stream->src->srclen > 0; | ||
1291 | } | ||
1292 | static inline | ||
1293 | xoff_t xd3_encoder_srcbase (xd3_stream *stream) { | ||
1294 | return stream->src->srcbase; | ||
1295 | } | ||
1296 | static inline | ||
1297 | usize_t xd3_encoder_srclen (xd3_stream *stream) { | ||
1298 | return stream->src->srclen; | ||
1299 | } | ||
1300 | |||
1301 | /* Checks for legal flag changes. */ | ||
1302 | static inline | ||
1303 | void xd3_set_flags (xd3_stream *stream, int flags) | ||
1304 | { | ||
1305 | /* The bitwise difference should contain only XD3_FLUSH or | ||
1306 | XD3_SKIP_WINDOW */ | ||
1307 | XD3_ASSERT(((flags ^ stream->flags) & ~(XD3_FLUSH | XD3_SKIP_WINDOW)) == 0); | ||
1308 | stream->flags = flags; | ||
1309 | } | ||
1310 | |||
1311 | /* Gives some extra information about the latest library error, if any | ||
1312 | * is known. */ | ||
1313 | static inline | ||
1314 | const char* xd3_errstring (xd3_stream *stream) | ||
1315 | { | ||
1316 | return stream->msg ? stream->msg : ""; | ||
1317 | } | ||
1318 | |||
1319 | |||
1320 | /* 64-bit divisions are expensive, which is why we require a | ||
1321 | * power-of-two source->blksize. To relax this restriction is | ||
1322 | * relatively easy, see the history for xd3_blksize_div(). */ | ||
1323 | static inline | ||
1324 | void xd3_blksize_div (const xoff_t offset, | ||
1325 | const xd3_source *source, | ||
1326 | xoff_t *blkno, | ||
1327 | usize_t *blkoff) { | ||
1328 | *blkno = (xoff_t) (offset >> source->shiftby); | ||
1329 | *blkoff = (usize_t) (offset & source->maskby); | ||
1330 | XD3_ASSERT (*blkoff < source->blksize); | ||
1331 | } | ||
1332 | |||
1333 | static inline | ||
1334 | void xd3_blksize_add (xoff_t *blkno, | ||
1335 | usize_t *blkoff, | ||
1336 | const xd3_source *source, | ||
1337 | const usize_t add) | ||
1338 | { | ||
1339 | usize_t blkdiff; | ||
1340 | |||
1341 | /* Does not check for overflow, checked in xdelta3-decode.h. */ | ||
1342 | *blkoff += add; | ||
1343 | blkdiff = *blkoff >> source->shiftby; | ||
1344 | |||
1345 | if (blkdiff) | ||
1346 | { | ||
1347 | *blkno += blkdiff; | ||
1348 | *blkoff &= source->maskby; | ||
1349 | } | ||
1350 | |||
1351 | XD3_ASSERT (*blkoff < source->blksize); | ||
1352 | } | ||
1353 | |||
1354 | #define XD3_NOOP 0U | ||
1355 | #define XD3_ADD 1U | ||
1356 | #define XD3_RUN 2U | ||
1357 | #define XD3_CPY 3U /* XD3_CPY rtypes are represented as (XD3_CPY + | ||
1358 | * copy-mode value) */ | ||
1359 | |||
1360 | #if XD3_DEBUG | ||
1361 | #define IF_DEBUG(x) x | ||
1362 | #else | ||
1363 | #define IF_DEBUG(x) | ||
1364 | #endif | ||
1365 | #if XD3_DEBUG > 1 | ||
1366 | #define IF_DEBUG1(x) x | ||
1367 | #else | ||
1368 | #define IF_DEBUG1(x) | ||
1369 | #endif | ||
1370 | #if XD3_DEBUG > 2 | ||
1371 | #define IF_DEBUG2(x) x | ||
1372 | #else | ||
1373 | #define IF_DEBUG2(x) | ||
1374 | #endif | ||
1375 | |||
1376 | #define SIZEOF_ARRAY(x) (sizeof(x) / sizeof(x[0])) | ||
1377 | |||
1378 | #endif /* _XDELTA3_H_ */ | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1_to_v2.bin b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1_to_v2.bin new file mode 100644 index 0000000..8621f0e --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v1_to_v2.bin | |||
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diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v2.bin b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v2.bin new file mode 100644 index 0000000..0242c57 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/file_v2.bin | |||
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1 | /* xdelta 3 - delta compression tools and library | ||
2 | * Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, | ||
3 | * 2008, 2009, 2010. Joshua P. MacDonald | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; either version 2 of the License, or | ||
8 | * (at your option) any later version. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | * You should have received a copy of the GNU General Public License | ||
16 | * along with this program; if not, write to the Free Software | ||
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
18 | |||
19 | ------------------------------------------------------------------- | ||
20 | |||
21 | Xdelta 3 | ||
22 | |||
23 | The goal of this library is to to implement both the (stand-alone) | ||
24 | data-compression and delta-compression aspects of VCDIFF encoding, and | ||
25 | to support a programming interface that works like Zlib | ||
26 | (http://www.gzip.org/zlib.html). See RFC3284: The VCDIFF Generic | ||
27 | Differencing and Compression Data Format. | ||
28 | |||
29 | VCDIFF is a unified encoding that combines data-compression and | ||
30 | delta-encoding ("differencing"). | ||
31 | |||
32 | VCDIFF has a detailed byte-code instruction set with many features. | ||
33 | The instruction format supports an immediate size operand for small | ||
34 | COPYs and ADDs (e.g., under 18 bytes). There are also instruction | ||
35 | "modes", which are used to compress COPY addresses by using two | ||
36 | address caches. An instruction mode refers to slots in the NEAR | ||
37 | and SAME caches for recent addresses. NEAR remembers the | ||
38 | previous 4 (by default) COPY addresses, and SAME catches | ||
39 | frequent re-uses of the same address using a 3-way (by default) | ||
40 | 256-entry associative cache of [ADDR mod 256], the encoded byte. | ||
41 | A hit in the NEAR/SAME cache requires 0/1 ADDR bytes. | ||
42 | |||
43 | VCDIFF has a default instruction table, but an alternate | ||
44 | instruction tables may themselves be be delta-compressed and | ||
45 | included in the encoding header. This allows even more freedom. | ||
46 | There are 9 instruction modes in the default code table, 4 near, 3 | ||
47 | same, VCD_SELF (absolute encoding) and VCD_HERE (relative to the | ||
48 | current position). | ||
49 | |||
50 | ---------------------------------------------------------------------- | ||
51 | |||
52 | Algorithms | ||
53 | |||
54 | Aside from the details of encoding and decoding, there are a bunch | ||
55 | of algorithms needed. | ||
56 | |||
57 | 1. STRING-MATCH. A two-level fingerprinting approach is used. A | ||
58 | single loop computes the two checksums -- small and large -- at | ||
59 | successive offsets in the TARGET file. The large checksum is more | ||
60 | accurate and is used to discover SOURCE matches, which are | ||
61 | potentially very long. The small checksum is used to discover | ||
62 | copies within the TARGET. Small matching, which is more expensive, | ||
63 | usually dominates the large STRING-MATCH costs in this code - the | ||
64 | more exhaustive the search, the better the results. Either of the | ||
65 | two string-matching mechanisms may be disabled. | ||
66 | |||
67 | 2. INSTRUCTION SELECTION. The IOPT buffer here represents a queue | ||
68 | used to store overlapping copy instructions. There are two possible | ||
69 | optimizations that go beyond a greedy search. Both of these fall | ||
70 | into the category of "non-greedy matching" optimizations. | ||
71 | |||
72 | The first optimization stems from backward SOURCE-COPY matching. | ||
73 | When a new SOURCE-COPY instruction covers a previous instruction in | ||
74 | the target completely, it is erased from the queue. Randal Burns | ||
75 | originally analyzed these algorithms and did a lot of related work | ||
76 | (\cite the 1.5-pass algorithm). | ||
77 | |||
78 | The second optimization comes by the encoding of common very-small | ||
79 | COPY and ADD instructions, for which there are special DOUBLE-code | ||
80 | instructions, which code two instructions in a single byte. | ||
81 | |||
82 | The cost of bad instruction-selection overhead is relatively high | ||
83 | for data-compression, relative to delta-compression, so this second | ||
84 | optimization is fairly important. With "lazy" matching (the name | ||
85 | used in Zlib for a similar optimization), the string-match | ||
86 | algorithm searches after a match for potential overlapping copy | ||
87 | instructions. In Xdelta and by default, VCDIFF, the minimum match | ||
88 | size is 4 bytes, whereas Zlib searches with a 3-byte minimum. This | ||
89 | feature, combined with double instructions, provides a nice | ||
90 | challenge. Search in this file for "black magic", a heuristic. | ||
91 | |||
92 | 3. STREAM ALIGNMENT. Stream alignment is needed to compress large | ||
93 | inputs in constant space. See xd3_srcwin_move_point(). | ||
94 | |||
95 | 4. WINDOW SELECTION. When the IOPT buffer flushes, in the first call | ||
96 | to xd3_iopt_finish_encoding containing any kind of copy instruction, | ||
97 | the parameters of the source window must be decided: the offset into | ||
98 | the source and the length of the window. Since the IOPT buffer is | ||
99 | finite, the program may be forced to fix these values before knowing | ||
100 | the best offset/length. | ||
101 | |||
102 | 5. SECONDARY COMPRESSION. VCDIFF supports a secondary encoding to | ||
103 | be applied to the individual sections of the data format, which are | ||
104 | ADDRess, INSTruction, and DATA. Several secondary compressor | ||
105 | variations are implemented here, although none is standardized yet. | ||
106 | |||
107 | One is an adaptive huffman algorithm -- the FGK algorithm (Faller, | ||
108 | Gallager, and Knuth, 1985). This compressor is extremely slow. | ||
109 | |||
110 | The other is a simple static Huffman routine, which is the base | ||
111 | case of a semi-adaptive scheme published by D.J. Wheeler and first | ||
112 | widely used in bzip2 (by Julian Seward). This is a very | ||
113 | interesting algorithm, originally published in nearly cryptic form | ||
114 | by D.J. Wheeler. !!!NOTE!!! Because these are not standardized, | ||
115 | secondary compression remains off by default. | ||
116 | ftp://ftp.cl.cam.ac.uk/users/djw3/bred3.{c,ps} | ||
117 | -------------------------------------------------------------------- | ||
118 | |||
119 | Other Features | ||
120 | |||
121 | 1. USER CONVENIENCE | ||
122 | |||
123 | For user convenience, it is essential to recognize Gzip-compressed | ||
124 | files and automatically Gzip-decompress them prior to | ||
125 | delta-compression (or else no delta-compression will be achieved | ||
126 | unless the user manually decompresses the inputs). The compressed | ||
127 | represention competes with Xdelta, and this must be hidden from the | ||
128 | command-line user interface. The Xdelta-1.x encoding was simple, not | ||
129 | compressed itself, so Xdelta-1.x uses Zlib internally to compress the | ||
130 | representation. | ||
131 | |||
132 | This implementation supports external compression, which implements | ||
133 | the necessary fork() and pipe() mechanics. There is a tricky step | ||
134 | involved to support automatic detection of a compressed input in a | ||
135 | non-seekable input. First you read a bit of the input to detect | ||
136 | magic headers. When a compressed format is recognized, exec() the | ||
137 | external compression program and create a second child process to | ||
138 | copy the original input stream. [Footnote: There is a difficulty | ||
139 | related to using Gzip externally. It is not possible to decompress | ||
140 | and recompress a Gzip file transparently. If FILE.GZ had a | ||
141 | cryptographic signature, then, after: (1) Gzip-decompression, (2) | ||
142 | Xdelta-encoding, (3) Gzip-compression the signature could be | ||
143 | broken. The only way to solve this problem is to guess at Gzip's | ||
144 | compression level or control it by other means. I recommend that | ||
145 | specific implementations of any compression scheme store | ||
146 | information needed to exactly re-compress the input, that way | ||
147 | external compression is transparent - however, this won't happen | ||
148 | here until it has stabilized.] | ||
149 | |||
150 | 2. APPLICATION-HEADER | ||
151 | |||
152 | This feature was introduced in RFC3284. It allows any application | ||
153 | to include a header within the VCDIFF file format. This allows | ||
154 | general inter-application data exchange with support for | ||
155 | application-specific extensions to communicate metadata. | ||
156 | |||
157 | 3. VCDIFF CHECKSUM | ||
158 | |||
159 | An optional checksum value is included with each window, which can | ||
160 | be used to validate the final result. This verifies the correct source | ||
161 | file was used for decompression as well as the obvious advantage: | ||
162 | checking the implementation (and underlying) correctness. | ||
163 | |||
164 | 4. LIGHT WEIGHT | ||
165 | |||
166 | The code makes efforts to avoid copying data more than necessary. | ||
167 | The code delays many initialization tasks until the first use, it | ||
168 | optimizes for identical (perfectly matching) inputs. It does not | ||
169 | compute any checksums until the first lookup misses. Memory usage | ||
170 | is reduced. String-matching is templatized (by slightly gross use | ||
171 | of CPP) to hard-code alternative compile-time defaults. The code | ||
172 | has few outside dependencies. | ||
173 | ---------------------------------------------------------------------- | ||
174 | |||
175 | The default rfc3284 instruction table: | ||
176 | (see RFC for the explanation) | ||
177 | |||
178 | TYPE SIZE MODE TYPE SIZE MODE INDEX | ||
179 | -------------------------------------------------------------------- | ||
180 | 1. Run 0 0 Noop 0 0 0 | ||
181 | 2. Add 0, [1,17] 0 Noop 0 0 [1,18] | ||
182 | 3. Copy 0, [4,18] 0 Noop 0 0 [19,34] | ||
183 | 4. Copy 0, [4,18] 1 Noop 0 0 [35,50] | ||
184 | 5. Copy 0, [4,18] 2 Noop 0 0 [51,66] | ||
185 | 6. Copy 0, [4,18] 3 Noop 0 0 [67,82] | ||
186 | 7. Copy 0, [4,18] 4 Noop 0 0 [83,98] | ||
187 | 8. Copy 0, [4,18] 5 Noop 0 0 [99,114] | ||
188 | 9. Copy 0, [4,18] 6 Noop 0 0 [115,130] | ||
189 | 10. Copy 0, [4,18] 7 Noop 0 0 [131,146] | ||
190 | 11. Copy 0, [4,18] 8 Noop 0 0 [147,162] | ||
191 | 12. Add [1,4] 0 Copy [4,6] 0 [163,174] | ||
192 | 13. Add [1,4] 0 Copy [4,6] 1 [175,186] | ||
193 | 14. Add [1,4] 0 Copy [4,6] 2 [187,198] | ||
194 | 15. Add [1,4] 0 Copy [4,6] 3 [199,210] | ||
195 | 16. Add [1,4] 0 Copy [4,6] 4 [211,222] | ||
196 | 17. Add [1,4] 0 Copy [4,6] 5 [223,234] | ||
197 | 18. Add [1,4] 0 Copy 4 6 [235,238] | ||
198 | 19. Add [1,4] 0 Copy 4 7 [239,242] | ||
199 | 20. Add [1,4] 0 Copy 4 8 [243,246] | ||
200 | 21. Copy 4 [0,8] Add 1 0 [247,255] | ||
201 | -------------------------------------------------------------------- | ||
202 | |||
203 | Reading the source: Overview | ||
204 | |||
205 | This file includes itself in several passes to macro-expand certain | ||
206 | sections with variable forms. Just read ahead, there's only a | ||
207 | little confusion. I know this sounds ugly, but hard-coding some of | ||
208 | the string-matching parameters results in a 10-15% increase in | ||
209 | string-match performance. The only time this hurts is when you have | ||
210 | unbalanced #if/endifs. | ||
211 | |||
212 | A single compilation unit tames the Makefile. In short, this is to | ||
213 | allow the above-described hack without an explodingMakefile. The | ||
214 | single compilation unit includes the core library features, | ||
215 | configurable string-match templates, optional main() command-line | ||
216 | tool, misc optional features, and a regression test. Features are | ||
217 | controled with CPP #defines, see Makefile.am. | ||
218 | |||
219 | The initial __XDELTA3_C_HEADER_PASS__ starts first, the _INLINE_ and | ||
220 | _TEMPLATE_ sections follow. Easy stuff first, hard stuff last. | ||
221 | |||
222 | Optional features include: | ||
223 | |||
224 | xdelta3-main.h The command-line interface, external compression | ||
225 | support, POSIX-specific, info & VCDIFF-debug tools. | ||
226 | xdelta3-second.h The common secondary compression routines. | ||
227 | xdelta3-decoder.h All decoding routines. | ||
228 | xdelta3-djw.h The semi-adaptive huffman secondary encoder. | ||
229 | xdelta3-fgk.h The adaptive huffman secondary encoder. | ||
230 | xdelta3-test.h The unit test covers major algorithms, | ||
231 | encoding and decoding. There are single-bit | ||
232 | error decoding tests. There are 32/64-bit file size | ||
233 | boundary tests. There are command-line tests. | ||
234 | There are compression tests. There are external | ||
235 | compression tests. There are string-matching tests. | ||
236 | There should be more tests... | ||
237 | |||
238 | Additional headers include: | ||
239 | |||
240 | xdelta3.h The public header file. | ||
241 | xdelta3-cfgs.h The default settings for default, built-in | ||
242 | encoders. These are hard-coded at | ||
243 | compile-time. There is also a single | ||
244 | soft-coded string matcher for experimenting | ||
245 | with arbitrary values. | ||
246 | xdelta3-list.h A cyclic list template | ||
247 | |||
248 | Misc little debug utilities: | ||
249 | |||
250 | badcopy.c Randomly modifies an input file based on two | ||
251 | parameters: (1) the probability that a byte in | ||
252 | the file is replaced with a pseudo-random value, | ||
253 | and (2) the mean change size. Changes are | ||
254 | generated using an expoential distribution | ||
255 | which approximates the expected error_prob | ||
256 | distribution. | ||
257 | -------------------------------------------------------------------- | ||
258 | |||
259 | This file itself is unusually large. I hope to defend this layout | ||
260 | with lots of comments. Everything in this file is related to | ||
261 | encoding and decoding. I like it all together - the template stuff | ||
262 | is just a hack. */ | ||
263 | |||
264 | #ifndef __XDELTA3_C_HEADER_PASS__ | ||
265 | #define __XDELTA3_C_HEADER_PASS__ | ||
266 | |||
267 | #include <errno.h> | ||
268 | #include <string.h> | ||
269 | |||
270 | #include "xdelta3.h" | ||
271 | |||
272 | /*********************************************************************** | ||
273 | STATIC CONFIGURATION | ||
274 | ***********************************************************************/ | ||
275 | |||
276 | #ifndef XD3_MAIN /* the main application */ | ||
277 | #define XD3_MAIN 0 | ||
278 | #endif | ||
279 | |||
280 | #ifndef VCDIFF_TOOLS | ||
281 | #define VCDIFF_TOOLS XD3_MAIN | ||
282 | #endif | ||
283 | |||
284 | #ifndef SECONDARY_FGK /* one from the algorithm preservation department: */ | ||
285 | #define SECONDARY_FGK 0 /* adaptive Huffman routines */ | ||
286 | #endif | ||
287 | |||
288 | #ifndef SECONDARY_DJW /* semi-adaptive/static Huffman for the eventual */ | ||
289 | #define SECONDARY_DJW 0 /* standardization, off by default until such time. */ | ||
290 | #endif | ||
291 | |||
292 | #ifndef GENERIC_ENCODE_TABLES /* These three are the RFC-spec'd app-specific */ | ||
293 | #define GENERIC_ENCODE_TABLES 0 /* code features. This is tested but not recommended */ | ||
294 | #endif /* unless there's a real application. */ | ||
295 | #ifndef GENERIC_ENCODE_TABLES_COMPUTE | ||
296 | #define GENERIC_ENCODE_TABLES_COMPUTE 0 | ||
297 | #endif | ||
298 | #ifndef GENERIC_ENCODE_TABLES_COMPUTE_PRINT | ||
299 | #define GENERIC_ENCODE_TABLES_COMPUTE_PRINT 0 | ||
300 | #endif | ||
301 | |||
302 | #if XD3_ENCODER | ||
303 | #define IF_ENCODER(x) x | ||
304 | #else | ||
305 | #define IF_ENCODER(x) | ||
306 | #endif | ||
307 | |||
308 | /***********************************************************************/ | ||
309 | |||
310 | /* header indicator bits */ | ||
311 | #define VCD_SECONDARY (1U << 0) /* uses secondary compressor */ | ||
312 | #define VCD_CODETABLE (1U << 1) /* supplies code table data */ | ||
313 | #define VCD_APPHEADER (1U << 2) /* supplies application data */ | ||
314 | #define VCD_INVHDR (~0x7U) | ||
315 | |||
316 | /* window indicator bits */ | ||
317 | #define VCD_SOURCE (1U << 0) /* copy window in source file */ | ||
318 | #define VCD_TARGET (1U << 1) /* copy window in target file */ | ||
319 | #define VCD_ADLER32 (1U << 2) /* has adler32 checksum */ | ||
320 | #define VCD_INVWIN (~0x7U) | ||
321 | |||
322 | #define VCD_SRCORTGT (VCD_SOURCE | VCD_TARGET) | ||
323 | |||
324 | /* delta indicator bits */ | ||
325 | #define VCD_DATACOMP (1U << 0) | ||
326 | #define VCD_INSTCOMP (1U << 1) | ||
327 | #define VCD_ADDRCOMP (1U << 2) | ||
328 | #define VCD_INVDEL (~0x7U) | ||
329 | |||
330 | typedef enum { | ||
331 | VCD_DJW_ID = 1, | ||
332 | VCD_FGK_ID = 16, /* Note: these are not standard IANA-allocated IDs! */ | ||
333 | } xd3_secondary_ids; | ||
334 | |||
335 | typedef enum { | ||
336 | SEC_NOFLAGS = 0, | ||
337 | |||
338 | /* Note: SEC_COUNT_FREQS Not implemented (to eliminate 1st Huffman pass) */ | ||
339 | SEC_COUNT_FREQS = (1 << 0), | ||
340 | } xd3_secondary_flags; | ||
341 | |||
342 | typedef enum { | ||
343 | DATA_SECTION, /* These indicate which section to the secondary | ||
344 | * compressor. */ | ||
345 | INST_SECTION, /* The header section is not compressed, therefore not | ||
346 | * listed here. */ | ||
347 | ADDR_SECTION, | ||
348 | } xd3_section_type; | ||
349 | |||
350 | typedef unsigned int xd3_rtype; | ||
351 | |||
352 | /***********************************************************************/ | ||
353 | |||
354 | #include "xdelta3-list.h" | ||
355 | |||
356 | XD3_MAKELIST(xd3_rlist, xd3_rinst, link); | ||
357 | |||
358 | /***********************************************************************/ | ||
359 | |||
360 | #define SECONDARY_MIN_SAVINGS 2 /* Secondary compression has to save | ||
361 | at least this many bytes. */ | ||
362 | #define SECONDARY_MIN_INPUT 10 /* Secondary compression needs at | ||
363 | least this many bytes. */ | ||
364 | |||
365 | #define VCDIFF_MAGIC1 0xd6 /* 1st file byte */ | ||
366 | #define VCDIFF_MAGIC2 0xc3 /* 2nd file byte */ | ||
367 | #define VCDIFF_MAGIC3 0xc4 /* 3rd file byte */ | ||
368 | #define VCDIFF_VERSION 0x00 /* 4th file byte */ | ||
369 | |||
370 | #define VCD_SELF 0 /* 1st address mode */ | ||
371 | #define VCD_HERE 1 /* 2nd address mode */ | ||
372 | |||
373 | #define CODE_TABLE_STRING_SIZE (6 * 256) /* Should fit a code table string. */ | ||
374 | #define CODE_TABLE_VCDIFF_SIZE (6 * 256) /* Should fit a compressed code | ||
375 | * table string */ | ||
376 | |||
377 | #define SECONDARY_ANY (SECONDARY_DJW || SECONDARY_FGK) | ||
378 | |||
379 | #define ALPHABET_SIZE 256 /* Used in test code--size of the secondary | ||
380 | * compressor alphabet. */ | ||
381 | |||
382 | #define HASH_PERMUTE 1 /* The input is permuted by random nums */ | ||
383 | #define ADLER_LARGE_CKSUM 1 /* Adler checksum vs. RK checksum */ | ||
384 | |||
385 | #define HASH_CKOFFSET 1U /* Table entries distinguish "no-entry" from | ||
386 | * offset 0 using this offset. */ | ||
387 | |||
388 | #define MIN_SMALL_LOOK 2U /* Match-optimization stuff. */ | ||
389 | #define MIN_LARGE_LOOK 2U | ||
390 | #define MIN_MATCH_OFFSET 1U | ||
391 | #define MAX_MATCH_SPLIT 18U /* VCDIFF code table: 18 is the default limit | ||
392 | * for direct-coded ADD sizes */ | ||
393 | |||
394 | #define LEAST_MATCH_INCR 0 /* The least number of bytes an overlapping | ||
395 | * match must beat the preceding match by. This | ||
396 | * is a bias for the lazy match optimization. A | ||
397 | * non-zero value means that an adjacent match | ||
398 | * has to be better by more than the step | ||
399 | * between them. 0. */ | ||
400 | |||
401 | #define MIN_MATCH 4U /* VCDIFF code table: MIN_MATCH=4 */ | ||
402 | #define MIN_ADD 1U /* 1 */ | ||
403 | #define MIN_RUN 8U /* The shortest run, if it is shorter than this | ||
404 | * an immediate add/copy will be just as good. | ||
405 | * ADD1/COPY6 = 1I+1D+1A bytes, RUN18 = | ||
406 | * 1I+1D+1A. */ | ||
407 | |||
408 | #define MAX_MODES 9 /* Maximum number of nodes used for | ||
409 | * compression--does not limit decompression. */ | ||
410 | |||
411 | #define ENC_SECTS 4 /* Number of separate output sections. */ | ||
412 | |||
413 | #define HDR_TAIL(s) ((s)->enc_tails[0]) | ||
414 | #define DATA_TAIL(s) ((s)->enc_tails[1]) | ||
415 | #define INST_TAIL(s) ((s)->enc_tails[2]) | ||
416 | #define ADDR_TAIL(s) ((s)->enc_tails[3]) | ||
417 | |||
418 | #define HDR_HEAD(s) ((s)->enc_heads[0]) | ||
419 | #define DATA_HEAD(s) ((s)->enc_heads[1]) | ||
420 | #define INST_HEAD(s) ((s)->enc_heads[2]) | ||
421 | #define ADDR_HEAD(s) ((s)->enc_heads[3]) | ||
422 | |||
423 | #define TOTAL_MODES(x) (2+(x)->acache.s_same+(x)->acache.s_near) | ||
424 | |||
425 | /* Template instances. */ | ||
426 | #if XD3_BUILD_SLOW | ||
427 | #define IF_BUILD_SLOW(x) x | ||
428 | #else | ||
429 | #define IF_BUILD_SLOW(x) | ||
430 | #endif | ||
431 | #if XD3_BUILD_FAST | ||
432 | #define IF_BUILD_FAST(x) x | ||
433 | #else | ||
434 | #define IF_BUILD_FAST(x) | ||
435 | #endif | ||
436 | #if XD3_BUILD_FASTER | ||
437 | #define IF_BUILD_FASTER(x) x | ||
438 | #else | ||
439 | #define IF_BUILD_FASTER(x) | ||
440 | #endif | ||
441 | #if XD3_BUILD_FASTEST | ||
442 | #define IF_BUILD_FASTEST(x) x | ||
443 | #else | ||
444 | #define IF_BUILD_FASTEST(x) | ||
445 | #endif | ||
446 | #if XD3_BUILD_SOFT | ||
447 | #define IF_BUILD_SOFT(x) x | ||
448 | #else | ||
449 | #define IF_BUILD_SOFT(x) | ||
450 | #endif | ||
451 | #if XD3_BUILD_DEFAULT | ||
452 | #define IF_BUILD_DEFAULT(x) x | ||
453 | #else | ||
454 | #define IF_BUILD_DEFAULT(x) | ||
455 | #endif | ||
456 | |||
457 | /* Consume N bytes of input, only used by the decoder. */ | ||
458 | #define DECODE_INPUT(n) \ | ||
459 | do { \ | ||
460 | stream->total_in += (xoff_t) (n); \ | ||
461 | stream->avail_in -= (n); \ | ||
462 | stream->next_in += (n); \ | ||
463 | } while (0) | ||
464 | |||
465 | /* Update the run-length state */ | ||
466 | #define NEXTRUN(c) do { if ((c) == run_c) { run_l += 1; } \ | ||
467 | else { run_c = (c); run_l = 1; } } while (0) | ||
468 | |||
469 | /* This CPP-conditional stuff can be cleaned up... */ | ||
470 | #if REGRESSION_TEST | ||
471 | #define IF_REGRESSION(x) x | ||
472 | #else | ||
473 | #define IF_REGRESSION(x) | ||
474 | #endif | ||
475 | |||
476 | /***********************************************************************/ | ||
477 | |||
478 | #if XD3_ENCODER | ||
479 | static void* xd3_alloc0 (xd3_stream *stream, | ||
480 | usize_t elts, | ||
481 | usize_t size); | ||
482 | |||
483 | |||
484 | static xd3_output* xd3_alloc_output (xd3_stream *stream, | ||
485 | xd3_output *old_output); | ||
486 | |||
487 | static int xd3_alloc_iopt (xd3_stream *stream, usize_t elts); | ||
488 | |||
489 | static void xd3_free_output (xd3_stream *stream, | ||
490 | xd3_output *output); | ||
491 | |||
492 | static int xd3_emit_byte (xd3_stream *stream, | ||
493 | xd3_output **outputp, | ||
494 | uint8_t code); | ||
495 | |||
496 | static int xd3_emit_bytes (xd3_stream *stream, | ||
497 | xd3_output **outputp, | ||
498 | const uint8_t *base, | ||
499 | usize_t size); | ||
500 | |||
501 | static int xd3_emit_double (xd3_stream *stream, xd3_rinst *first, | ||
502 | xd3_rinst *second, usize_t code); | ||
503 | static int xd3_emit_single (xd3_stream *stream, xd3_rinst *single, | ||
504 | usize_t code); | ||
505 | |||
506 | static usize_t xd3_sizeof_output (xd3_output *output); | ||
507 | static void xd3_encode_reset (xd3_stream *stream); | ||
508 | |||
509 | static int xd3_source_match_setup (xd3_stream *stream, xoff_t srcpos); | ||
510 | static int xd3_source_extend_match (xd3_stream *stream); | ||
511 | static int xd3_srcwin_setup (xd3_stream *stream); | ||
512 | static usize_t xd3_iopt_last_matched (xd3_stream *stream); | ||
513 | static int xd3_emit_uint32_t (xd3_stream *stream, xd3_output **output, | ||
514 | uint32_t num); | ||
515 | |||
516 | static usize_t xd3_smatch (xd3_stream *stream, | ||
517 | usize_t base, | ||
518 | usize_t scksum, | ||
519 | usize_t *match_offset); | ||
520 | static int xd3_string_match_init (xd3_stream *stream); | ||
521 | static uint32_t xd3_scksum (uint32_t *state, const uint8_t *seg, | ||
522 | const usize_t ln); | ||
523 | static usize_t xd3_comprun (const uint8_t *seg, usize_t slook, uint8_t *run_cp); | ||
524 | static int xd3_srcwin_move_point (xd3_stream *stream, | ||
525 | usize_t *next_move_point); | ||
526 | |||
527 | static int xd3_emit_run (xd3_stream *stream, usize_t pos, | ||
528 | usize_t size, uint8_t *run_c); | ||
529 | static usize_t xd3_checksum_hash (const xd3_hash_cfg *cfg, | ||
530 | const usize_t cksum); | ||
531 | static xoff_t xd3_source_cksum_offset(xd3_stream *stream, usize_t low); | ||
532 | static void xd3_scksum_insert (xd3_stream *stream, | ||
533 | usize_t inx, | ||
534 | usize_t scksum, | ||
535 | usize_t pos); | ||
536 | |||
537 | |||
538 | #if XD3_DEBUG | ||
539 | static void xd3_verify_run_state (xd3_stream *stream, | ||
540 | const uint8_t *inp, | ||
541 | usize_t x_run_l, | ||
542 | uint8_t *x_run_c); | ||
543 | static void xd3_verify_large_state (xd3_stream *stream, | ||
544 | const uint8_t *inp, | ||
545 | uint32_t x_cksum); | ||
546 | static void xd3_verify_small_state (xd3_stream *stream, | ||
547 | const uint8_t *inp, | ||
548 | uint32_t x_cksum); | ||
549 | |||
550 | #endif /* XD3_DEBUG */ | ||
551 | #endif /* XD3_ENCODER */ | ||
552 | |||
553 | static int xd3_decode_allocate (xd3_stream *stream, usize_t size, | ||
554 | uint8_t **copied1, usize_t *alloc1); | ||
555 | |||
556 | static void xd3_compute_code_table_string (const xd3_dinst *code_table, | ||
557 | uint8_t *str); | ||
558 | static void* xd3_alloc (xd3_stream *stream, usize_t elts, usize_t size); | ||
559 | static void xd3_free (xd3_stream *stream, void *ptr); | ||
560 | |||
561 | static int xd3_read_uint32_t (xd3_stream *stream, const uint8_t **inpp, | ||
562 | const uint8_t *max, uint32_t *valp); | ||
563 | |||
564 | #if REGRESSION_TEST | ||
565 | static int xd3_selftest (void); | ||
566 | #endif | ||
567 | |||
568 | /***********************************************************************/ | ||
569 | |||
570 | #define UINT32_OFLOW_MASK 0xfe000000U | ||
571 | #define UINT64_OFLOW_MASK 0xfe00000000000000ULL | ||
572 | |||
573 | #ifndef UINT32_MAX | ||
574 | #define UINT32_MAX 4294967295U | ||
575 | #endif | ||
576 | |||
577 | #ifndef UINT64_MAX | ||
578 | #define UINT64_MAX 18446744073709551615ULL | ||
579 | #endif | ||
580 | |||
581 | #if SIZEOF_USIZE_T == 4 | ||
582 | #define USIZE_T_MAX UINT32_MAX | ||
583 | #define xd3_decode_size xd3_decode_uint32_t | ||
584 | #define xd3_emit_size xd3_emit_uint32_t | ||
585 | #define xd3_sizeof_size xd3_sizeof_uint32_t | ||
586 | #define xd3_read_size xd3_read_uint32_t | ||
587 | #elif SIZEOF_USIZE_T == 8 | ||
588 | #define USIZE_T_MAX UINT64_MAX | ||
589 | #define xd3_decode_size xd3_decode_uint64_t | ||
590 | #define xd3_emit_size xd3_emit_uint64_t | ||
591 | #define xd3_sizeof_size xd3_sizeof_uint64_t | ||
592 | #define xd3_read_size xd3_read_uint64_t | ||
593 | #endif | ||
594 | |||
595 | #if SIZEOF_XOFF_T == 4 | ||
596 | #define XOFF_T_MAX UINT32_MAX | ||
597 | #define xd3_decode_offset xd3_decode_uint32_t | ||
598 | #define xd3_emit_offset xd3_emit_uint32_t | ||
599 | #elif SIZEOF_XOFF_T == 8 | ||
600 | #define XOFF_T_MAX UINT64_MAX | ||
601 | #define xd3_decode_offset xd3_decode_uint64_t | ||
602 | #define xd3_emit_offset xd3_emit_uint64_t | ||
603 | #endif | ||
604 | |||
605 | #define USIZE_T_OVERFLOW(a,b) ((USIZE_T_MAX - (usize_t) (a)) < (usize_t) (b)) | ||
606 | #define XOFF_T_OVERFLOW(a,b) ((XOFF_T_MAX - (xoff_t) (a)) < (xoff_t) (b)) | ||
607 | |||
608 | const char* xd3_strerror (int ret) | ||
609 | { | ||
610 | switch (ret) | ||
611 | { | ||
612 | case XD3_INPUT: return "XD3_INPUT"; | ||
613 | case XD3_OUTPUT: return "XD3_OUTPUT"; | ||
614 | case XD3_GETSRCBLK: return "XD3_GETSRCBLK"; | ||
615 | case XD3_GOTHEADER: return "XD3_GOTHEADER"; | ||
616 | case XD3_WINSTART: return "XD3_WINSTART"; | ||
617 | case XD3_WINFINISH: return "XD3_WINFINISH"; | ||
618 | case XD3_TOOFARBACK: return "XD3_TOOFARBACK"; | ||
619 | case XD3_INTERNAL: return "XD3_INTERNAL"; | ||
620 | case XD3_INVALID: return "XD3_INVALID"; | ||
621 | case XD3_INVALID_INPUT: return "XD3_INVALID_INPUT"; | ||
622 | case XD3_NOSECOND: return "XD3_NOSECOND"; | ||
623 | case XD3_UNIMPLEMENTED: return "XD3_UNIMPLEMENTED"; | ||
624 | } | ||
625 | return NULL; | ||
626 | } | ||
627 | |||
628 | /***********************************************************************/ | ||
629 | |||
630 | #define xd3_sec_data(s) ((s)->sec_stream_d) | ||
631 | #define xd3_sec_inst(s) ((s)->sec_stream_i) | ||
632 | #define xd3_sec_addr(s) ((s)->sec_stream_a) | ||
633 | |||
634 | struct _xd3_sec_type | ||
635 | { | ||
636 | int id; | ||
637 | const char *name; | ||
638 | xd3_secondary_flags flags; | ||
639 | |||
640 | /* xd3_sec_stream is opaque to the generic code */ | ||
641 | xd3_sec_stream* (*alloc) (xd3_stream *stream); | ||
642 | void (*destroy) (xd3_stream *stream, | ||
643 | xd3_sec_stream *sec); | ||
644 | void (*init) (xd3_sec_stream *sec); | ||
645 | int (*decode) (xd3_stream *stream, | ||
646 | xd3_sec_stream *sec_stream, | ||
647 | const uint8_t **input, | ||
648 | const uint8_t *input_end, | ||
649 | uint8_t **output, | ||
650 | const uint8_t *output_end); | ||
651 | #if XD3_ENCODER | ||
652 | int (*encode) (xd3_stream *stream, | ||
653 | xd3_sec_stream *sec_stream, | ||
654 | xd3_output *input, | ||
655 | xd3_output *output, | ||
656 | xd3_sec_cfg *cfg); | ||
657 | #endif | ||
658 | }; | ||
659 | |||
660 | #define BIT_STATE_ENCODE_INIT { 0, 1 } | ||
661 | #define BIT_STATE_DECODE_INIT { 0, 0x100 } | ||
662 | |||
663 | typedef struct _bit_state bit_state; | ||
664 | struct _bit_state | ||
665 | { | ||
666 | usize_t cur_byte; | ||
667 | usize_t cur_mask; | ||
668 | }; | ||
669 | |||
670 | #if SECONDARY_ANY == 0 | ||
671 | #define IF_SEC(x) | ||
672 | #define IF_NSEC(x) x | ||
673 | #else /* yuck */ | ||
674 | #define IF_SEC(x) x | ||
675 | #define IF_NSEC(x) | ||
676 | static int | ||
677 | xd3_decode_secondary (xd3_stream *stream, | ||
678 | xd3_desect *sect, | ||
679 | xd3_sec_stream **sec_streamp); | ||
680 | #if XD3_ENCODER | ||
681 | static int | ||
682 | xd3_encode_secondary (xd3_stream *stream, | ||
683 | xd3_output **head, | ||
684 | xd3_output **tail, | ||
685 | xd3_sec_stream **sec_streamp, | ||
686 | xd3_sec_cfg *cfg, | ||
687 | int *did_it); | ||
688 | #endif | ||
689 | #endif /* SECONDARY_ANY */ | ||
690 | |||
691 | #if SECONDARY_FGK | ||
692 | extern const xd3_sec_type fgk_sec_type; | ||
693 | #define IF_FGK(x) x | ||
694 | #define FGK_CASE(s) \ | ||
695 | s->sec_type = & fgk_sec_type; \ | ||
696 | break; | ||
697 | #else | ||
698 | #define IF_FGK(x) | ||
699 | #define FGK_CASE(s) \ | ||
700 | s->msg = "unavailable secondary compressor: FGK Adaptive Huffman"; \ | ||
701 | return XD3_INTERNAL; | ||
702 | #endif | ||
703 | |||
704 | #if SECONDARY_DJW | ||
705 | extern const xd3_sec_type djw_sec_type; | ||
706 | #define IF_DJW(x) x | ||
707 | #define DJW_CASE(s) \ | ||
708 | s->sec_type = & djw_sec_type; \ | ||
709 | break; | ||
710 | #else | ||
711 | #define IF_DJW(x) | ||
712 | #define DJW_CASE(s) \ | ||
713 | s->msg = "unavailable secondary compressor: DJW Static Huffman"; \ | ||
714 | return XD3_INTERNAL; | ||
715 | #endif | ||
716 | |||
717 | /***********************************************************************/ | ||
718 | |||
719 | #include "xdelta3-hash.h" | ||
720 | |||
721 | /* Process template passes - this includes xdelta3.c several times. */ | ||
722 | #define __XDELTA3_C_TEMPLATE_PASS__ | ||
723 | #include "xdelta3-cfgs.h" | ||
724 | #undef __XDELTA3_C_TEMPLATE_PASS__ | ||
725 | |||
726 | /* Process the inline pass. */ | ||
727 | #define __XDELTA3_C_INLINE_PASS__ | ||
728 | #include "xdelta3.c" | ||
729 | #undef __XDELTA3_C_INLINE_PASS__ | ||
730 | |||
731 | /* Secondary compression */ | ||
732 | #if SECONDARY_ANY | ||
733 | #include "xdelta3-second.h" | ||
734 | #endif | ||
735 | |||
736 | #if SECONDARY_FGK | ||
737 | #include "xdelta3-fgk.h" | ||
738 | const xd3_sec_type fgk_sec_type = | ||
739 | { | ||
740 | VCD_FGK_ID, | ||
741 | "FGK Adaptive Huffman", | ||
742 | SEC_NOFLAGS, | ||
743 | (xd3_sec_stream* (*)(xd3_stream*)) fgk_alloc, | ||
744 | (void (*)(xd3_stream*, xd3_sec_stream*)) fgk_destroy, | ||
745 | (void (*)(xd3_sec_stream*)) fgk_init, | ||
746 | (int (*)(xd3_stream*, xd3_sec_stream*, const uint8_t**, const uint8_t*, | ||
747 | uint8_t**, const uint8_t*)) xd3_decode_fgk, | ||
748 | IF_ENCODER((int (*)(xd3_stream*, xd3_sec_stream*, xd3_output*, | ||
749 | xd3_output*, xd3_sec_cfg*)) xd3_encode_fgk) | ||
750 | }; | ||
751 | #endif | ||
752 | |||
753 | #if SECONDARY_DJW | ||
754 | #include "xdelta3-djw.h" | ||
755 | const xd3_sec_type djw_sec_type = | ||
756 | { | ||
757 | VCD_DJW_ID, | ||
758 | "Static Huffman", | ||
759 | SEC_COUNT_FREQS, | ||
760 | (xd3_sec_stream* (*)(xd3_stream*)) djw_alloc, | ||
761 | (void (*)(xd3_stream*, xd3_sec_stream*)) djw_destroy, | ||
762 | (void (*)(xd3_sec_stream*)) djw_init, | ||
763 | (int (*)(xd3_stream*, xd3_sec_stream*, const uint8_t**, const uint8_t*, | ||
764 | uint8_t**, const uint8_t*)) xd3_decode_huff, | ||
765 | IF_ENCODER((int (*)(xd3_stream*, xd3_sec_stream*, xd3_output*, | ||
766 | xd3_output*, xd3_sec_cfg*)) xd3_encode_huff) | ||
767 | }; | ||
768 | #endif | ||
769 | |||
770 | #if XD3_MAIN || PYTHON_MODULE || SWIG_MODULE || NOT_MAIN | ||
771 | #include "xdelta3-main.h" | ||
772 | #endif | ||
773 | |||
774 | #if REGRESSION_TEST | ||
775 | #include "xdelta3-test.h" | ||
776 | #endif | ||
777 | |||
778 | #if PYTHON_MODULE | ||
779 | #include "xdelta3-python.h" | ||
780 | #endif | ||
781 | |||
782 | #endif /* __XDELTA3_C_HEADER_PASS__ */ | ||
783 | #ifdef __XDELTA3_C_INLINE_PASS__ | ||
784 | |||
785 | /**************************************************************** | ||
786 | Instruction tables | ||
787 | *****************************************************************/ | ||
788 | |||
789 | /* The following code implements a parametrized description of the | ||
790 | * code table given above for a few reasons. It is not necessary for | ||
791 | * implementing the standard, to support compression with variable | ||
792 | * tables, so an implementation is only required to know the default | ||
793 | * code table to begin decompression. (If the encoder uses an | ||
794 | * alternate table, the table is included in compressed form inside | ||
795 | * the VCDIFF file.) | ||
796 | * | ||
797 | * Before adding variable-table support there were two functions which | ||
798 | * were hard-coded to the default table above. | ||
799 | * xd3_compute_default_table() would create the default table by | ||
800 | * filling a 256-elt array of xd3_dinst values. The corresponding | ||
801 | * function, xd3_choose_instruction(), would choose an instruction | ||
802 | * based on the hard-coded parameters of the default code table. | ||
803 | * | ||
804 | * Notes: The parametrized code table description here only generates | ||
805 | * tables of a certain regularity similar to the default table by | ||
806 | * allowing to vary the distribution of single- and | ||
807 | * double-instructions and change the number of near and same copy | ||
808 | * modes. More exotic tables are only possible by extending this | ||
809 | * code. | ||
810 | * | ||
811 | * For performance reasons, both the parametrized and non-parametrized | ||
812 | * versions of xd3_choose_instruction remain. The parametrized | ||
813 | * version is only needed for testing multi-table decoding support. | ||
814 | * If ever multi-table encoding is required, this can be optimized by | ||
815 | * compiling static functions for each table. | ||
816 | */ | ||
817 | |||
818 | /* The XD3_CHOOSE_INSTRUCTION calls xd3_choose_instruction with the | ||
819 | * table description when GENERIC_ENCODE_TABLES are in use. The | ||
820 | * IF_GENCODETBL macro enables generic-code-table specific code. */ | ||
821 | #if GENERIC_ENCODE_TABLES | ||
822 | #define XD3_CHOOSE_INSTRUCTION(stream,prev,inst) xd3_choose_instruction (stream->code_table_desc, prev, inst) | ||
823 | #define IF_GENCODETBL(x) x | ||
824 | #else | ||
825 | #define XD3_CHOOSE_INSTRUCTION(stream,prev,inst) xd3_choose_instruction (prev, inst) | ||
826 | #define IF_GENCODETBL(x) | ||
827 | #endif | ||
828 | |||
829 | /* This structure maintains information needed by | ||
830 | * xd3_choose_instruction to compute the code for a double instruction | ||
831 | * by first indexing an array of code_table_sizes by copy mode, then | ||
832 | * using (offset + (muliplier * X)) */ | ||
833 | struct _xd3_code_table_sizes { | ||
834 | uint8_t cpy_max; | ||
835 | uint8_t offset; | ||
836 | uint8_t mult; | ||
837 | }; | ||
838 | |||
839 | /* This contains a complete description of a code table. */ | ||
840 | struct _xd3_code_table_desc | ||
841 | { | ||
842 | /* Assumes a single RUN instruction */ | ||
843 | /* Assumes that MIN_MATCH is 4 */ | ||
844 | |||
845 | uint8_t add_sizes; /* Number of immediate-size single adds (default 17) */ | ||
846 | uint8_t near_modes; /* Number of near copy modes (default 4) */ | ||
847 | uint8_t same_modes; /* Number of same copy modes (default 3) */ | ||
848 | uint8_t cpy_sizes; /* Number of immediate-size single copies (default 15) */ | ||
849 | |||
850 | uint8_t addcopy_add_max; /* Maximum add size for an add-copy double instruction, | ||
851 | all modes (default 4) */ | ||
852 | uint8_t addcopy_near_cpy_max; /* Maximum cpy size for an add-copy double instruction, | ||
853 | up through VCD_NEAR modes (default 6) */ | ||
854 | uint8_t addcopy_same_cpy_max; /* Maximum cpy size for an add-copy double instruction, | ||
855 | VCD_SAME modes (default 4) */ | ||
856 | |||
857 | uint8_t copyadd_add_max; /* Maximum add size for a copy-add double instruction, | ||
858 | all modes (default 1) */ | ||
859 | uint8_t copyadd_near_cpy_max; /* Maximum cpy size for a copy-add double instruction, | ||
860 | up through VCD_NEAR modes (default 4) */ | ||
861 | uint8_t copyadd_same_cpy_max; /* Maximum cpy size for a copy-add double instruction, | ||
862 | VCD_SAME modes (default 4) */ | ||
863 | |||
864 | xd3_code_table_sizes addcopy_max_sizes[MAX_MODES]; | ||
865 | xd3_code_table_sizes copyadd_max_sizes[MAX_MODES]; | ||
866 | }; | ||
867 | |||
868 | /* The rfc3284 code table is represented: */ | ||
869 | static const xd3_code_table_desc __rfc3284_code_table_desc = { | ||
870 | 17, /* add sizes */ | ||
871 | 4, /* near modes */ | ||
872 | 3, /* same modes */ | ||
873 | 15, /* copy sizes */ | ||
874 | |||
875 | 4, /* add-copy max add */ | ||
876 | 6, /* add-copy max cpy, near */ | ||
877 | 4, /* add-copy max cpy, same */ | ||
878 | |||
879 | 1, /* copy-add max add */ | ||
880 | 4, /* copy-add max cpy, near */ | ||
881 | 4, /* copy-add max cpy, same */ | ||
882 | |||
883 | /* addcopy */ | ||
884 | { {6,163,3},{6,175,3},{6,187,3},{6,199,3},{6,211,3},{6,223,3},{4,235,1},{4,239,1},{4,243,1} }, | ||
885 | /* copyadd */ | ||
886 | { {4,247,1},{4,248,1},{4,249,1},{4,250,1},{4,251,1},{4,252,1},{4,253,1},{4,254,1},{4,255,1} }, | ||
887 | }; | ||
888 | |||
889 | #if GENERIC_ENCODE_TABLES | ||
890 | /* An alternate code table for testing (5 near, 0 same): | ||
891 | * | ||
892 | * TYPE SIZE MODE TYPE SIZE MODE INDEX | ||
893 | * --------------------------------------------------------------- | ||
894 | * 1. Run 0 0 Noop 0 0 0 | ||
895 | * 2. Add 0, [1,23] 0 Noop 0 0 [1,24] | ||
896 | * 3. Copy 0, [4,20] 0 Noop 0 0 [25,42] | ||
897 | * 4. Copy 0, [4,20] 1 Noop 0 0 [43,60] | ||
898 | * 5. Copy 0, [4,20] 2 Noop 0 0 [61,78] | ||
899 | * 6. Copy 0, [4,20] 3 Noop 0 0 [79,96] | ||
900 | * 7. Copy 0, [4,20] 4 Noop 0 0 [97,114] | ||
901 | * 8. Copy 0, [4,20] 5 Noop 0 0 [115,132] | ||
902 | * 9. Copy 0, [4,20] 6 Noop 0 0 [133,150] | ||
903 | * 10. Add [1,4] 0 Copy [4,6] 0 [151,162] | ||
904 | * 11. Add [1,4] 0 Copy [4,6] 1 [163,174] | ||
905 | * 12. Add [1,4] 0 Copy [4,6] 2 [175,186] | ||
906 | * 13. Add [1,4] 0 Copy [4,6] 3 [187,198] | ||
907 | * 14. Add [1,4] 0 Copy [4,6] 4 [199,210] | ||
908 | * 15. Add [1,4] 0 Copy [4,6] 5 [211,222] | ||
909 | * 16. Add [1,4] 0 Copy [4,6] 6 [223,234] | ||
910 | * 17. Copy 4 [0,6] Add [1,3] 0 [235,255] | ||
911 | * --------------------------------------------------------------- */ | ||
912 | static const xd3_code_table_desc __alternate_code_table_desc = { | ||
913 | 23, /* add sizes */ | ||
914 | 5, /* near modes */ | ||
915 | 0, /* same modes */ | ||
916 | 17, /* copy sizes */ | ||
917 | |||
918 | 4, /* add-copy max add */ | ||
919 | 6, /* add-copy max cpy, near */ | ||
920 | 0, /* add-copy max cpy, same */ | ||
921 | |||
922 | 3, /* copy-add max add */ | ||
923 | 4, /* copy-add max cpy, near */ | ||
924 | 0, /* copy-add max cpy, same */ | ||
925 | |||
926 | /* addcopy */ | ||
927 | { {6,151,3},{6,163,3},{6,175,3},{6,187,3},{6,199,3},{6,211,3},{6,223,3},{0,0,0},{0,0,0} }, | ||
928 | /* copyadd */ | ||
929 | { {4,235,1},{4,238,1},{4,241,1},{4,244,1},{4,247,1},{4,250,1},{4,253,1},{0,0,0},{0,0,0} }, | ||
930 | }; | ||
931 | #endif | ||
932 | |||
933 | /* Computes code table entries of TBL using the specified description. */ | ||
934 | static void | ||
935 | xd3_build_code_table (const xd3_code_table_desc *desc, xd3_dinst *tbl) | ||
936 | { | ||
937 | usize_t size1, size2, mode; | ||
938 | usize_t cpy_modes = 2 + desc->near_modes + desc->same_modes; | ||
939 | xd3_dinst *d = tbl; | ||
940 | |||
941 | (d++)->type1 = XD3_RUN; | ||
942 | (d++)->type1 = XD3_ADD; | ||
943 | |||
944 | for (size1 = 1; size1 <= desc->add_sizes; size1 += 1, d += 1) | ||
945 | { | ||
946 | d->type1 = XD3_ADD; | ||
947 | d->size1 = size1; | ||
948 | } | ||
949 | |||
950 | for (mode = 0; mode < cpy_modes; mode += 1) | ||
951 | { | ||
952 | (d++)->type1 = XD3_CPY + mode; | ||
953 | |||
954 | for (size1 = MIN_MATCH; size1 < MIN_MATCH + desc->cpy_sizes; size1 += 1, d += 1) | ||
955 | { | ||
956 | d->type1 = XD3_CPY + mode; | ||
957 | d->size1 = size1; | ||
958 | } | ||
959 | } | ||
960 | |||
961 | for (mode = 0; mode < cpy_modes; mode += 1) | ||
962 | { | ||
963 | for (size1 = 1; size1 <= desc->addcopy_add_max; size1 += 1) | ||
964 | { | ||
965 | usize_t max = (mode < 2U + desc->near_modes) ? | ||
966 | desc->addcopy_near_cpy_max : | ||
967 | desc->addcopy_same_cpy_max; | ||
968 | |||
969 | for (size2 = MIN_MATCH; size2 <= max; size2 += 1, d += 1) | ||
970 | { | ||
971 | d->type1 = XD3_ADD; | ||
972 | d->size1 = size1; | ||
973 | d->type2 = XD3_CPY + mode; | ||
974 | d->size2 = size2; | ||
975 | } | ||
976 | } | ||
977 | } | ||
978 | |||
979 | for (mode = 0; mode < cpy_modes; mode += 1) | ||
980 | { | ||
981 | usize_t max = (mode < 2U + desc->near_modes) ? | ||
982 | desc->copyadd_near_cpy_max : | ||
983 | desc->copyadd_same_cpy_max; | ||
984 | |||
985 | for (size1 = MIN_MATCH; size1 <= max; size1 += 1) | ||
986 | { | ||
987 | for (size2 = 1; size2 <= desc->copyadd_add_max; size2 += 1, d += 1) | ||
988 | { | ||
989 | d->type1 = XD3_CPY + mode; | ||
990 | d->size1 = size1; | ||
991 | d->type2 = XD3_ADD; | ||
992 | d->size2 = size2; | ||
993 | } | ||
994 | } | ||
995 | } | ||
996 | |||
997 | XD3_ASSERT (d - tbl == 256); | ||
998 | } | ||
999 | |||
1000 | /* This function generates the static default code table. */ | ||
1001 | static const xd3_dinst* | ||
1002 | xd3_rfc3284_code_table (void) | ||
1003 | { | ||
1004 | static xd3_dinst __rfc3284_code_table[256]; | ||
1005 | |||
1006 | if (__rfc3284_code_table[0].type1 != XD3_RUN) | ||
1007 | { | ||
1008 | xd3_build_code_table (& __rfc3284_code_table_desc, __rfc3284_code_table); | ||
1009 | } | ||
1010 | |||
1011 | return __rfc3284_code_table; | ||
1012 | } | ||
1013 | |||
1014 | #if XD3_ENCODER | ||
1015 | #if GENERIC_ENCODE_TABLES | ||
1016 | /* This function generates the alternate code table. */ | ||
1017 | static const xd3_dinst* | ||
1018 | xd3_alternate_code_table (void) | ||
1019 | { | ||
1020 | static xd3_dinst __alternate_code_table[256]; | ||
1021 | |||
1022 | if (__alternate_code_table[0].type1 != XD3_RUN) | ||
1023 | { | ||
1024 | xd3_build_code_table (& __alternate_code_table_desc, __alternate_code_table); | ||
1025 | } | ||
1026 | |||
1027 | return __alternate_code_table; | ||
1028 | } | ||
1029 | |||
1030 | /* This function computes the ideal second instruction INST based on | ||
1031 | * preceding instruction PREV. If it is possible to issue a double | ||
1032 | * instruction based on this pair it sets PREV->code2, otherwise it | ||
1033 | * sets INST->code1. */ | ||
1034 | static void | ||
1035 | xd3_choose_instruction (const xd3_code_table_desc *desc, xd3_rinst *prev, xd3_rinst *inst) | ||
1036 | { | ||
1037 | switch (inst->type) | ||
1038 | { | ||
1039 | case XD3_RUN: | ||
1040 | /* The 0th instruction is RUN */ | ||
1041 | inst->code1 = 0; | ||
1042 | break; | ||
1043 | |||
1044 | case XD3_ADD: | ||
1045 | |||
1046 | if (inst->size > desc->add_sizes) | ||
1047 | { | ||
1048 | /* The first instruction is non-immediate ADD */ | ||
1049 | inst->code1 = 1; | ||
1050 | } | ||
1051 | else | ||
1052 | { | ||
1053 | /* The following ADD_SIZES instructions are immediate ADDs */ | ||
1054 | inst->code1 = 1 + inst->size; | ||
1055 | |||
1056 | /* Now check for a possible COPY-ADD double instruction */ | ||
1057 | if (prev != NULL) | ||
1058 | { | ||
1059 | int prev_mode = prev->type - XD3_CPY; | ||
1060 | |||
1061 | /* If previous is a copy. Note: as long as the previous | ||
1062 | * is not a RUN instruction, it should be a copy because | ||
1063 | * it cannot be an add. This check is more clear. */ | ||
1064 | if (prev_mode >= 0 && inst->size <= desc->copyadd_add_max) | ||
1065 | { | ||
1066 | const xd3_code_table_sizes *sizes = & desc->copyadd_max_sizes[prev_mode]; | ||
1067 | |||
1068 | /* This check and the inst->size-<= above are == in | ||
1069 | the default table. */ | ||
1070 | if (prev->size <= sizes->cpy_max) | ||
1071 | { | ||
1072 | /* The second and third exprs are 0 in the | ||
1073 | default table. */ | ||
1074 | prev->code2 = sizes->offset + | ||
1075 | (sizes->mult * (prev->size - MIN_MATCH)) + | ||
1076 | (inst->size - MIN_ADD); | ||
1077 | } | ||
1078 | } | ||
1079 | } | ||
1080 | } | ||
1081 | break; | ||
1082 | |||
1083 | default: | ||
1084 | { | ||
1085 | int mode = inst->type - XD3_CPY; | ||
1086 | |||
1087 | /* The large copy instruction is offset by the run, large add, | ||
1088 | * and immediate adds, then multipled by the number of | ||
1089 | * immediate copies plus one (the large copy) (i.e., if there | ||
1090 | * are 15 immediate copy instructions then there are 16 copy | ||
1091 | * instructions per mode). */ | ||
1092 | inst->code1 = 2 + desc->add_sizes + (1 + desc->cpy_sizes) * mode; | ||
1093 | |||
1094 | /* Now if the copy is short enough for an immediate instruction. */ | ||
1095 | if (inst->size < MIN_MATCH + desc->cpy_sizes && | ||
1096 | /* TODO: there needs to be a more comprehensive test for this | ||
1097 | * boundary condition, merge is now exercising code in which | ||
1098 | * size < MIN_MATCH is possible and it's unclear if the above | ||
1099 | * size < (MIN_MATCH + cpy_sizes) should be a <= from inspection | ||
1100 | * of the default table version below. */ | ||
1101 | inst->size >= MIN_MATCH) | ||
1102 | { | ||
1103 | inst->code1 += inst->size + 1 - MIN_MATCH; | ||
1104 | |||
1105 | /* Now check for a possible ADD-COPY double instruction. */ | ||
1106 | if ( (prev != NULL) && | ||
1107 | (prev->type == XD3_ADD) && | ||
1108 | (prev->size <= desc->addcopy_add_max) ) | ||
1109 | { | ||
1110 | const xd3_code_table_sizes *sizes = & desc->addcopy_max_sizes[mode]; | ||
1111 | |||
1112 | if (inst->size <= sizes->cpy_max) | ||
1113 | { | ||
1114 | prev->code2 = sizes->offset + | ||
1115 | (sizes->mult * (prev->size - MIN_ADD)) + | ||
1116 | (inst->size - MIN_MATCH); | ||
1117 | } | ||
1118 | } | ||
1119 | } | ||
1120 | } | ||
1121 | } | ||
1122 | } | ||
1123 | #else /* GENERIC_ENCODE_TABLES */ | ||
1124 | |||
1125 | /* This version of xd3_choose_instruction is hard-coded for the default | ||
1126 | table. */ | ||
1127 | static void | ||
1128 | xd3_choose_instruction (xd3_rinst *prev, xd3_rinst *inst) | ||
1129 | { | ||
1130 | switch (inst->type) | ||
1131 | { | ||
1132 | case XD3_RUN: | ||
1133 | inst->code1 = 0; | ||
1134 | break; | ||
1135 | |||
1136 | case XD3_ADD: | ||
1137 | inst->code1 = 1; | ||
1138 | |||
1139 | if (inst->size <= 17) | ||
1140 | { | ||
1141 | inst->code1 += inst->size; | ||
1142 | |||
1143 | if ( (inst->size == 1) && | ||
1144 | (prev != NULL) && | ||
1145 | (prev->size == 4) && | ||
1146 | (prev->type >= XD3_CPY) ) | ||
1147 | { | ||
1148 | prev->code2 = 247 + (prev->type - XD3_CPY); | ||
1149 | } | ||
1150 | } | ||
1151 | |||
1152 | break; | ||
1153 | |||
1154 | default: | ||
1155 | { | ||
1156 | int mode = inst->type - XD3_CPY; | ||
1157 | |||
1158 | XD3_ASSERT (inst->type >= XD3_CPY && inst->type < 12); | ||
1159 | |||
1160 | inst->code1 = 19 + 16 * mode; | ||
1161 | |||
1162 | if (inst->size <= 18 && inst->size >= 4) | ||
1163 | { | ||
1164 | inst->code1 += inst->size - 3; | ||
1165 | |||
1166 | if ( (prev != NULL) && | ||
1167 | (prev->type == XD3_ADD) && | ||
1168 | (prev->size <= 4) ) | ||
1169 | { | ||
1170 | if ( (inst->size <= 6) && | ||
1171 | (mode <= 5) ) | ||
1172 | { | ||
1173 | prev->code2 = 163 + (mode * 12) + (3 * (prev->size - 1)) + (inst->size - 4); | ||
1174 | |||
1175 | XD3_ASSERT (prev->code2 <= 234); | ||
1176 | } | ||
1177 | else if ( (inst->size == 4) && | ||
1178 | (mode >= 6) ) | ||
1179 | { | ||
1180 | prev->code2 = 235 + ((mode - 6) * 4) + (prev->size - 1); | ||
1181 | |||
1182 | XD3_ASSERT (prev->code2 <= 246); | ||
1183 | } | ||
1184 | } | ||
1185 | } | ||
1186 | |||
1187 | XD3_ASSERT (inst->code1 <= 162); | ||
1188 | } | ||
1189 | break; | ||
1190 | } | ||
1191 | } | ||
1192 | #endif /* GENERIC_ENCODE_TABLES */ | ||
1193 | |||
1194 | /*********************************************************************** | ||
1195 | Instruction table encoder/decoder | ||
1196 | ***********************************************************************/ | ||
1197 | |||
1198 | #if GENERIC_ENCODE_TABLES | ||
1199 | #if GENERIC_ENCODE_TABLES_COMPUTE == 0 | ||
1200 | |||
1201 | /* In this case, we hard-code the result of | ||
1202 | * compute_code_table_encoding for each alternate code table, | ||
1203 | * presuming that saves time/space. This has been 131 bytes, but | ||
1204 | * secondary compression was turned off. */ | ||
1205 | static const uint8_t __alternate_code_table_compressed[178] = | ||
1206 | {0xd6,0xc3,0xc4,0x00,0x00,0x01,0x8a,0x6f,0x40,0x81,0x27,0x8c,0x00,0x00,0x4a,0x4a,0x0d,0x02,0x01,0x03, | ||
1207 | 0x01,0x03,0x00,0x01,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e, | ||
1208 | 0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x00,0x01,0x01,0x01,0x02,0x02,0x02,0x03,0x03,0x03,0x04, | ||
1209 | 0x04,0x04,0x04,0x00,0x04,0x05,0x06,0x01,0x02,0x03,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x05,0x05,0x05, | ||
1210 | 0x06,0x06,0x06,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x00,0x02,0x00,0x18,0x13,0x63,0x00,0x1b,0x00,0x54, | ||
1211 | 0x00,0x15,0x23,0x6f,0x00,0x28,0x13,0x54,0x00,0x15,0x01,0x1a,0x31,0x23,0x6c,0x0d,0x23,0x48,0x00,0x15, | ||
1212 | 0x93,0x6f,0x00,0x28,0x04,0x23,0x51,0x04,0x32,0x00,0x2b,0x00,0x12,0x00,0x12,0x00,0x12,0x00,0x12,0x00, | ||
1213 | 0x12,0x00,0x12,0x53,0x57,0x9c,0x07,0x43,0x6f,0x00,0x34,0x00,0x0c,0x00,0x0c,0x00,0x0c,0x00,0x0c,0x00, | ||
1214 | 0x0c,0x00,0x0c,0x00,0x15,0x00,0x82,0x6f,0x00,0x15,0x12,0x0c,0x00,0x03,0x03,0x00,0x06,0x00,}; | ||
1215 | |||
1216 | static int | ||
1217 | xd3_compute_alternate_table_encoding (xd3_stream *stream, const uint8_t **data, usize_t *size) | ||
1218 | { | ||
1219 | (*data) = __alternate_code_table_compressed; | ||
1220 | (*size) = sizeof (__alternate_code_table_compressed); | ||
1221 | return 0; | ||
1222 | } | ||
1223 | |||
1224 | #else | ||
1225 | |||
1226 | /* The alternate code table will be computed and stored here. */ | ||
1227 | static uint8_t __alternate_code_table_compressed[CODE_TABLE_VCDIFF_SIZE]; | ||
1228 | static usize_t __alternate_code_table_compressed_size; | ||
1229 | |||
1230 | /* This function generates a delta describing the code table for | ||
1231 | * encoding within a VCDIFF file. This function is NOT thread safe | ||
1232 | * because it is only intended that this function is used to generate | ||
1233 | * statically-compiled strings. "comp_string" must be sized | ||
1234 | * CODE_TABLE_VCDIFF_SIZE. */ | ||
1235 | int xd3_compute_code_table_encoding (xd3_stream *in_stream, | ||
1236 | const xd3_dinst *code_table, | ||
1237 | uint8_t *comp_string, | ||
1238 | usize_t *comp_string_size) | ||
1239 | { | ||
1240 | /* Use DJW secondary compression if it is on by default. This saves | ||
1241 | * about 20 bytes. */ | ||
1242 | uint8_t dflt_string[CODE_TABLE_STRING_SIZE]; | ||
1243 | uint8_t code_string[CODE_TABLE_STRING_SIZE]; | ||
1244 | |||
1245 | xd3_compute_code_table_string (xd3_rfc3284_code_table (), dflt_string); | ||
1246 | xd3_compute_code_table_string (code_table, code_string); | ||
1247 | |||
1248 | return xd3_encode_memory (code_string, CODE_TABLE_STRING_SIZE, | ||
1249 | dflt_string, CODE_TABLE_STRING_SIZE, | ||
1250 | comp_string, comp_string_size, | ||
1251 | CODE_TABLE_VCDIFF_SIZE, | ||
1252 | /* flags */ 0); | ||
1253 | } | ||
1254 | |||
1255 | /* Compute a delta between alternate and rfc3284 tables. As soon as | ||
1256 | * another alternate table is added, this code should become generic. | ||
1257 | * For now there is only one alternate table for testing. */ | ||
1258 | static int | ||
1259 | xd3_compute_alternate_table_encoding (xd3_stream *stream, const uint8_t **data, usize_t *size) | ||
1260 | { | ||
1261 | int ret; | ||
1262 | |||
1263 | if (__alternate_code_table_compressed[0] == 0) | ||
1264 | { | ||
1265 | if ((ret = xd3_compute_code_table_encoding (stream, xd3_alternate_code_table (), | ||
1266 | __alternate_code_table_compressed, | ||
1267 | & __alternate_code_table_compressed_size))) | ||
1268 | { | ||
1269 | return ret; | ||
1270 | } | ||
1271 | |||
1272 | /* During development of a new code table, enable this variable to print | ||
1273 | * the new static contents and determine its size. At run time the | ||
1274 | * table will be filled in appropriately, but at least it should have | ||
1275 | * the proper size beforehand. */ | ||
1276 | #if GENERIC_ENCODE_TABLES_COMPUTE_PRINT | ||
1277 | { | ||
1278 | int i; | ||
1279 | |||
1280 | DP(RINT, "\nstatic const usize_t __alternate_code_table_compressed_size = %u;\n", | ||
1281 | __alternate_code_table_compressed_size); | ||
1282 | |||
1283 | DP(RINT, "static const uint8_t __alternate_code_table_compressed[%u] =\n{", | ||
1284 | __alternate_code_table_compressed_size); | ||
1285 | |||
1286 | for (i = 0; i < __alternate_code_table_compressed_size; i += 1) | ||
1287 | { | ||
1288 | DP(RINT, "0x%02x,", __alternate_code_table_compressed[i]); | ||
1289 | if ((i % 20) == 19) { DP(RINT, "\n"); } | ||
1290 | } | ||
1291 | |||
1292 | DP(RINT, "};\n"); | ||
1293 | } | ||
1294 | #endif | ||
1295 | } | ||
1296 | |||
1297 | (*data) = __alternate_code_table_compressed; | ||
1298 | (*size) = __alternate_code_table_compressed_size; | ||
1299 | |||
1300 | return 0; | ||
1301 | } | ||
1302 | #endif /* GENERIC_ENCODE_TABLES_COMPUTE != 0 */ | ||
1303 | #endif /* GENERIC_ENCODE_TABLES */ | ||
1304 | |||
1305 | #endif /* XD3_ENCODER */ | ||
1306 | |||
1307 | /* This function generates the 1536-byte string specified in sections 5.4 and | ||
1308 | * 7 of rfc3284, which is used to represent a code table within a VCDIFF | ||
1309 | * file. */ | ||
1310 | void xd3_compute_code_table_string (const xd3_dinst *code_table, uint8_t *str) | ||
1311 | { | ||
1312 | int i, s; | ||
1313 | |||
1314 | XD3_ASSERT (CODE_TABLE_STRING_SIZE == 6 * 256); | ||
1315 | |||
1316 | for (s = 0; s < 6; s += 1) | ||
1317 | { | ||
1318 | for (i = 0; i < 256; i += 1) | ||
1319 | { | ||
1320 | switch (s) | ||
1321 | { | ||
1322 | case 0: *str++ = (code_table[i].type1 >= XD3_CPY ? XD3_CPY : code_table[i].type1); break; | ||
1323 | case 1: *str++ = (code_table[i].type2 >= XD3_CPY ? XD3_CPY : code_table[i].type2); break; | ||
1324 | case 2: *str++ = (code_table[i].size1); break; | ||
1325 | case 3: *str++ = (code_table[i].size2); break; | ||
1326 | case 4: *str++ = (code_table[i].type1 >= XD3_CPY ? code_table[i].type1 - XD3_CPY : 0); break; | ||
1327 | case 5: *str++ = (code_table[i].type2 >= XD3_CPY ? code_table[i].type2 - XD3_CPY : 0); break; | ||
1328 | } | ||
1329 | } | ||
1330 | } | ||
1331 | } | ||
1332 | |||
1333 | /* This function translates the code table string into the internal representation. The | ||
1334 | * stream's near and same-modes should already be set. */ | ||
1335 | static int | ||
1336 | xd3_apply_table_string (xd3_stream *stream, const uint8_t *code_string) | ||
1337 | { | ||
1338 | int i, s; | ||
1339 | int modes = TOTAL_MODES (stream); | ||
1340 | xd3_dinst *code_table; | ||
1341 | |||
1342 | if ((code_table = stream->code_table_alloc = | ||
1343 | (xd3_dinst*) xd3_alloc (stream, | ||
1344 | (usize_t) sizeof (xd3_dinst), | ||
1345 | 256)) == NULL) | ||
1346 | { | ||
1347 | return ENOMEM; | ||
1348 | } | ||
1349 | |||
1350 | for (s = 0; s < 6; s += 1) | ||
1351 | { | ||
1352 | for (i = 0; i < 256; i += 1) | ||
1353 | { | ||
1354 | switch (s) | ||
1355 | { | ||
1356 | case 0: | ||
1357 | if (*code_string > XD3_CPY) | ||
1358 | { | ||
1359 | stream->msg = "invalid code-table opcode"; | ||
1360 | return XD3_INTERNAL; | ||
1361 | } | ||
1362 | code_table[i].type1 = *code_string++; | ||
1363 | break; | ||
1364 | case 1: | ||
1365 | if (*code_string > XD3_CPY) | ||
1366 | { | ||
1367 | stream->msg = "invalid code-table opcode"; | ||
1368 | return XD3_INTERNAL; | ||
1369 | } | ||
1370 | code_table[i].type2 = *code_string++; | ||
1371 | break; | ||
1372 | case 2: | ||
1373 | if (*code_string != 0 && code_table[i].type1 == XD3_NOOP) | ||
1374 | { | ||
1375 | stream->msg = "invalid code-table size"; | ||
1376 | return XD3_INTERNAL; | ||
1377 | } | ||
1378 | code_table[i].size1 = *code_string++; | ||
1379 | break; | ||
1380 | case 3: | ||
1381 | if (*code_string != 0 && code_table[i].type2 == XD3_NOOP) | ||
1382 | { | ||
1383 | stream->msg = "invalid code-table size"; | ||
1384 | return XD3_INTERNAL; | ||
1385 | } | ||
1386 | code_table[i].size2 = *code_string++; | ||
1387 | break; | ||
1388 | case 4: | ||
1389 | if (*code_string >= modes) | ||
1390 | { | ||
1391 | stream->msg = "invalid code-table mode"; | ||
1392 | return XD3_INTERNAL; | ||
1393 | } | ||
1394 | if (*code_string != 0 && code_table[i].type1 != XD3_CPY) | ||
1395 | { | ||
1396 | stream->msg = "invalid code-table mode"; | ||
1397 | return XD3_INTERNAL; | ||
1398 | } | ||
1399 | code_table[i].type1 += *code_string++; | ||
1400 | break; | ||
1401 | case 5: | ||
1402 | if (*code_string >= modes) | ||
1403 | { | ||
1404 | stream->msg = "invalid code-table mode"; | ||
1405 | return XD3_INTERNAL; | ||
1406 | } | ||
1407 | if (*code_string != 0 && code_table[i].type2 != XD3_CPY) | ||
1408 | { | ||
1409 | stream->msg = "invalid code-table mode"; | ||
1410 | return XD3_INTERNAL; | ||
1411 | } | ||
1412 | code_table[i].type2 += *code_string++; | ||
1413 | break; | ||
1414 | } | ||
1415 | } | ||
1416 | } | ||
1417 | |||
1418 | stream->code_table = code_table; | ||
1419 | return 0; | ||
1420 | } | ||
1421 | |||
1422 | /* This function applies a code table delta and returns an actual code table. */ | ||
1423 | static int | ||
1424 | xd3_apply_table_encoding (xd3_stream *in_stream, const uint8_t *data, usize_t size) | ||
1425 | { | ||
1426 | uint8_t dflt_string[CODE_TABLE_STRING_SIZE]; | ||
1427 | uint8_t code_string[CODE_TABLE_STRING_SIZE]; | ||
1428 | usize_t code_size; | ||
1429 | int ret; | ||
1430 | |||
1431 | xd3_compute_code_table_string (xd3_rfc3284_code_table (), dflt_string); | ||
1432 | |||
1433 | if ((ret = xd3_decode_memory (data, size, | ||
1434 | dflt_string, CODE_TABLE_STRING_SIZE, | ||
1435 | code_string, &code_size, | ||
1436 | CODE_TABLE_STRING_SIZE, | ||
1437 | 0))) { return ret; } | ||
1438 | |||
1439 | if (code_size != sizeof (code_string)) | ||
1440 | { | ||
1441 | in_stream->msg = "corrupt code-table encoding"; | ||
1442 | return XD3_INTERNAL; | ||
1443 | } | ||
1444 | |||
1445 | return xd3_apply_table_string (in_stream, code_string); | ||
1446 | } | ||
1447 | |||
1448 | /***********************************************************************/ | ||
1449 | |||
1450 | static inline void | ||
1451 | xd3_swap_uint8p (uint8_t** p1, uint8_t** p2) | ||
1452 | { | ||
1453 | uint8_t *t = (*p1); | ||
1454 | (*p1) = (*p2); | ||
1455 | (*p2) = t; | ||
1456 | } | ||
1457 | |||
1458 | static inline void | ||
1459 | xd3_swap_usize_t (usize_t* p1, usize_t* p2) | ||
1460 | { | ||
1461 | usize_t t = (*p1); | ||
1462 | (*p1) = (*p2); | ||
1463 | (*p2) = t; | ||
1464 | } | ||
1465 | |||
1466 | /* It's not constant time, but it computes the log. */ | ||
1467 | static int | ||
1468 | xd3_check_pow2 (usize_t value, usize_t *logof) | ||
1469 | { | ||
1470 | usize_t x = 1; | ||
1471 | usize_t nolog; | ||
1472 | if (logof == NULL) { | ||
1473 | logof = &nolog; | ||
1474 | } | ||
1475 | |||
1476 | *logof = 0; | ||
1477 | |||
1478 | for (; x != 0; x <<= 1, *logof += 1) | ||
1479 | { | ||
1480 | if (x == value) | ||
1481 | { | ||
1482 | return 0; | ||
1483 | } | ||
1484 | } | ||
1485 | |||
1486 | return XD3_INTERNAL; | ||
1487 | } | ||
1488 | |||
1489 | static usize_t | ||
1490 | xd3_pow2_roundup (usize_t x) | ||
1491 | { | ||
1492 | usize_t i = 1; | ||
1493 | while (x > i) { | ||
1494 | i <<= 1U; | ||
1495 | } | ||
1496 | return i; | ||
1497 | } | ||
1498 | |||
1499 | static usize_t | ||
1500 | xd3_round_blksize (usize_t sz, usize_t blksz) | ||
1501 | { | ||
1502 | usize_t mod = sz & (blksz-1); | ||
1503 | |||
1504 | XD3_ASSERT (xd3_check_pow2 (blksz, NULL) == 0); | ||
1505 | |||
1506 | return mod ? (sz + (blksz - mod)) : sz; | ||
1507 | } | ||
1508 | |||
1509 | /*********************************************************************** | ||
1510 | Adler32 stream function: code copied from Zlib, defined in RFC1950 | ||
1511 | ***********************************************************************/ | ||
1512 | |||
1513 | #define A32_BASE 65521L /* Largest prime smaller than 2^16 */ | ||
1514 | #define A32_NMAX 5552 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ | ||
1515 | |||
1516 | #define A32_DO1(buf,i) {s1 += buf[i]; s2 += s1;} | ||
1517 | #define A32_DO2(buf,i) A32_DO1(buf,i); A32_DO1(buf,i+1); | ||
1518 | #define A32_DO4(buf,i) A32_DO2(buf,i); A32_DO2(buf,i+2); | ||
1519 | #define A32_DO8(buf,i) A32_DO4(buf,i); A32_DO4(buf,i+4); | ||
1520 | #define A32_DO16(buf) A32_DO8(buf,0); A32_DO8(buf,8); | ||
1521 | |||
1522 | static unsigned long adler32 (unsigned long adler, const uint8_t *buf, | ||
1523 | usize_t len) | ||
1524 | { | ||
1525 | unsigned long s1 = adler & 0xffff; | ||
1526 | unsigned long s2 = (adler >> 16) & 0xffff; | ||
1527 | int k; | ||
1528 | |||
1529 | while (len > 0) | ||
1530 | { | ||
1531 | k = (len < A32_NMAX) ? len : A32_NMAX; | ||
1532 | len -= k; | ||
1533 | |||
1534 | while (k >= 16) | ||
1535 | { | ||
1536 | A32_DO16(buf); | ||
1537 | buf += 16; | ||
1538 | k -= 16; | ||
1539 | } | ||
1540 | |||
1541 | if (k != 0) | ||
1542 | { | ||
1543 | do | ||
1544 | { | ||
1545 | s1 += *buf++; | ||
1546 | s2 += s1; | ||
1547 | } | ||
1548 | while (--k); | ||
1549 | } | ||
1550 | |||
1551 | s1 %= A32_BASE; | ||
1552 | s2 %= A32_BASE; | ||
1553 | } | ||
1554 | |||
1555 | return (s2 << 16) | s1; | ||
1556 | } | ||
1557 | |||
1558 | /*********************************************************************** | ||
1559 | Run-length function | ||
1560 | ***********************************************************************/ | ||
1561 | |||
1562 | #if XD3_ENCODER | ||
1563 | static usize_t | ||
1564 | xd3_comprun (const uint8_t *seg, usize_t slook, uint8_t *run_cp) | ||
1565 | { | ||
1566 | usize_t i; | ||
1567 | usize_t run_l = 0; | ||
1568 | uint8_t run_c = 0; | ||
1569 | |||
1570 | for (i = 0; i < slook; i += 1) | ||
1571 | { | ||
1572 | NEXTRUN(seg[i]); | ||
1573 | } | ||
1574 | |||
1575 | (*run_cp) = run_c; | ||
1576 | |||
1577 | return run_l; | ||
1578 | } | ||
1579 | #endif | ||
1580 | |||
1581 | /*********************************************************************** | ||
1582 | Basic encoder/decoder functions | ||
1583 | ***********************************************************************/ | ||
1584 | |||
1585 | static inline int | ||
1586 | xd3_decode_byte (xd3_stream *stream, usize_t *val) | ||
1587 | { | ||
1588 | if (stream->avail_in == 0) | ||
1589 | { | ||
1590 | stream->msg = "further input required"; | ||
1591 | return XD3_INPUT; | ||
1592 | } | ||
1593 | |||
1594 | (*val) = stream->next_in[0]; | ||
1595 | |||
1596 | DECODE_INPUT (1); | ||
1597 | return 0; | ||
1598 | } | ||
1599 | |||
1600 | static inline int | ||
1601 | xd3_decode_bytes (xd3_stream *stream, uint8_t *buf, usize_t *pos, usize_t size) | ||
1602 | { | ||
1603 | usize_t want; | ||
1604 | usize_t take; | ||
1605 | |||
1606 | /* Note: The case where (*pos == size) happens when a zero-length | ||
1607 | * appheader or code table is transmitted, but there is nothing in | ||
1608 | * the standard against that. */ | ||
1609 | while (*pos < size) | ||
1610 | { | ||
1611 | if (stream->avail_in == 0) | ||
1612 | { | ||
1613 | stream->msg = "further input required"; | ||
1614 | return XD3_INPUT; | ||
1615 | } | ||
1616 | |||
1617 | want = size - *pos; | ||
1618 | take = min (want, stream->avail_in); | ||
1619 | |||
1620 | memcpy (buf + *pos, stream->next_in, (size_t) take); | ||
1621 | |||
1622 | DECODE_INPUT (take); | ||
1623 | (*pos) += take; | ||
1624 | } | ||
1625 | |||
1626 | return 0; | ||
1627 | } | ||
1628 | |||
1629 | #if XD3_ENCODER | ||
1630 | static inline int | ||
1631 | xd3_emit_byte (xd3_stream *stream, | ||
1632 | xd3_output **outputp, | ||
1633 | uint8_t code) | ||
1634 | { | ||
1635 | xd3_output *output = (*outputp); | ||
1636 | |||
1637 | if (output->next == output->avail) | ||
1638 | { | ||
1639 | xd3_output *aoutput; | ||
1640 | |||
1641 | if ((aoutput = xd3_alloc_output (stream, output)) == NULL) | ||
1642 | { | ||
1643 | return ENOMEM; | ||
1644 | } | ||
1645 | |||
1646 | output = (*outputp) = aoutput; | ||
1647 | } | ||
1648 | |||
1649 | output->base[output->next++] = code; | ||
1650 | |||
1651 | return 0; | ||
1652 | } | ||
1653 | |||
1654 | static inline int | ||
1655 | xd3_emit_bytes (xd3_stream *stream, | ||
1656 | xd3_output **outputp, | ||
1657 | const uint8_t *base, | ||
1658 | usize_t size) | ||
1659 | { | ||
1660 | xd3_output *output = (*outputp); | ||
1661 | |||
1662 | do | ||
1663 | { | ||
1664 | usize_t take; | ||
1665 | |||
1666 | if (output->next == output->avail) | ||
1667 | { | ||
1668 | xd3_output *aoutput; | ||
1669 | |||
1670 | if ((aoutput = xd3_alloc_output (stream, output)) == NULL) | ||
1671 | { | ||
1672 | return ENOMEM; | ||
1673 | } | ||
1674 | |||
1675 | output = (*outputp) = aoutput; | ||
1676 | } | ||
1677 | |||
1678 | take = min (output->avail - output->next, size); | ||
1679 | |||
1680 | memcpy (output->base + output->next, base, (size_t) take); | ||
1681 | |||
1682 | output->next += take; | ||
1683 | size -= take; | ||
1684 | base += take; | ||
1685 | } | ||
1686 | while (size > 0); | ||
1687 | |||
1688 | return 0; | ||
1689 | } | ||
1690 | #endif /* XD3_ENCODER */ | ||
1691 | |||
1692 | /********************************************************************* | ||
1693 | Integer encoder/decoder functions | ||
1694 | **********************************************************************/ | ||
1695 | |||
1696 | #define DECODE_INTEGER_TYPE(PART,OFLOW) \ | ||
1697 | while (stream->avail_in != 0) \ | ||
1698 | { \ | ||
1699 | usize_t next = stream->next_in[0]; \ | ||
1700 | \ | ||
1701 | DECODE_INPUT(1); \ | ||
1702 | \ | ||
1703 | if (PART & OFLOW) \ | ||
1704 | { \ | ||
1705 | stream->msg = "overflow in decode_integer"; \ | ||
1706 | return XD3_INVALID_INPUT; \ | ||
1707 | } \ | ||
1708 | \ | ||
1709 | PART = (PART << 7) | (next & 127); \ | ||
1710 | \ | ||
1711 | if ((next & 128) == 0) \ | ||
1712 | { \ | ||
1713 | (*val) = PART; \ | ||
1714 | PART = 0; \ | ||
1715 | return 0; \ | ||
1716 | } \ | ||
1717 | } \ | ||
1718 | \ | ||
1719 | stream->msg = "further input required"; \ | ||
1720 | return XD3_INPUT | ||
1721 | |||
1722 | #define READ_INTEGER_TYPE(TYPE, OFLOW) \ | ||
1723 | TYPE val = 0; \ | ||
1724 | const uint8_t *inp = (*inpp); \ | ||
1725 | usize_t next; \ | ||
1726 | \ | ||
1727 | do \ | ||
1728 | { \ | ||
1729 | if (inp == max) \ | ||
1730 | { \ | ||
1731 | stream->msg = "end-of-input in read_integer"; \ | ||
1732 | return XD3_INVALID_INPUT; \ | ||
1733 | } \ | ||
1734 | \ | ||
1735 | if (val & OFLOW) \ | ||
1736 | { \ | ||
1737 | stream->msg = "overflow in read_intger"; \ | ||
1738 | return XD3_INVALID_INPUT; \ | ||
1739 | } \ | ||
1740 | \ | ||
1741 | next = (*inp++); \ | ||
1742 | val = (val << 7) | (next & 127); \ | ||
1743 | } \ | ||
1744 | while (next & 128); \ | ||
1745 | \ | ||
1746 | (*valp) = val; \ | ||
1747 | (*inpp) = inp; \ | ||
1748 | \ | ||
1749 | return 0 | ||
1750 | |||
1751 | #define EMIT_INTEGER_TYPE() \ | ||
1752 | /* max 64-bit value in base-7 encoding is 9.1 bytes */ \ | ||
1753 | uint8_t buf[10]; \ | ||
1754 | usize_t bufi = 10; \ | ||
1755 | \ | ||
1756 | /* This loop performs division and turns on all MSBs. */ \ | ||
1757 | do \ | ||
1758 | { \ | ||
1759 | buf[--bufi] = (num & 127) | 128; \ | ||
1760 | num >>= 7U; \ | ||
1761 | } \ | ||
1762 | while (num != 0); \ | ||
1763 | \ | ||
1764 | /* Turn off MSB of the last byte. */ \ | ||
1765 | buf[9] &= 127; \ | ||
1766 | \ | ||
1767 | return xd3_emit_bytes (stream, output, buf + bufi, 10 - bufi) | ||
1768 | |||
1769 | #define IF_SIZEOF32(x) if (num < (1U << (7 * (x)))) return (x); | ||
1770 | #define IF_SIZEOF64(x) if (num < (1ULL << (7 * (x)))) return (x); | ||
1771 | |||
1772 | #if USE_UINT32 | ||
1773 | static inline uint32_t | ||
1774 | xd3_sizeof_uint32_t (uint32_t num) | ||
1775 | { | ||
1776 | IF_SIZEOF32(1); | ||
1777 | IF_SIZEOF32(2); | ||
1778 | IF_SIZEOF32(3); | ||
1779 | IF_SIZEOF32(4); | ||
1780 | return 5; | ||
1781 | } | ||
1782 | |||
1783 | static inline int | ||
1784 | xd3_decode_uint32_t (xd3_stream *stream, uint32_t *val) | ||
1785 | { DECODE_INTEGER_TYPE (stream->dec_32part, UINT32_OFLOW_MASK); } | ||
1786 | |||
1787 | static inline int | ||
1788 | xd3_read_uint32_t (xd3_stream *stream, const uint8_t **inpp, | ||
1789 | const uint8_t *max, uint32_t *valp) | ||
1790 | { READ_INTEGER_TYPE (uint32_t, UINT32_OFLOW_MASK); } | ||
1791 | |||
1792 | #if XD3_ENCODER | ||
1793 | static inline int | ||
1794 | xd3_emit_uint32_t (xd3_stream *stream, xd3_output **output, uint32_t num) | ||
1795 | { EMIT_INTEGER_TYPE (); } | ||
1796 | #endif | ||
1797 | #endif | ||
1798 | |||
1799 | #if USE_UINT64 | ||
1800 | static inline int | ||
1801 | xd3_decode_uint64_t (xd3_stream *stream, uint64_t *val) | ||
1802 | { DECODE_INTEGER_TYPE (stream->dec_64part, UINT64_OFLOW_MASK); } | ||
1803 | |||
1804 | #if XD3_ENCODER | ||
1805 | static inline int | ||
1806 | xd3_emit_uint64_t (xd3_stream *stream, xd3_output **output, uint64_t num) | ||
1807 | { EMIT_INTEGER_TYPE (); } | ||
1808 | #endif | ||
1809 | |||
1810 | /* These are tested but not used */ | ||
1811 | #if REGRESSION_TEST | ||
1812 | static int | ||
1813 | xd3_read_uint64_t (xd3_stream *stream, const uint8_t **inpp, | ||
1814 | const uint8_t *max, uint64_t *valp) | ||
1815 | { READ_INTEGER_TYPE (uint64_t, UINT64_OFLOW_MASK); } | ||
1816 | |||
1817 | static uint32_t | ||
1818 | xd3_sizeof_uint64_t (uint64_t num) | ||
1819 | { | ||
1820 | IF_SIZEOF64(1); | ||
1821 | IF_SIZEOF64(2); | ||
1822 | IF_SIZEOF64(3); | ||
1823 | IF_SIZEOF64(4); | ||
1824 | IF_SIZEOF64(5); | ||
1825 | IF_SIZEOF64(6); | ||
1826 | IF_SIZEOF64(7); | ||
1827 | IF_SIZEOF64(8); | ||
1828 | IF_SIZEOF64(9); | ||
1829 | |||
1830 | return 10; | ||
1831 | } | ||
1832 | #endif | ||
1833 | |||
1834 | #endif | ||
1835 | |||
1836 | /*********************************************************************** | ||
1837 | Address cache stuff | ||
1838 | ***********************************************************************/ | ||
1839 | |||
1840 | static int | ||
1841 | xd3_alloc_cache (xd3_stream *stream) | ||
1842 | { | ||
1843 | if (stream->acache.near_array != NULL) | ||
1844 | { | ||
1845 | xd3_free (stream, stream->acache.near_array); | ||
1846 | } | ||
1847 | |||
1848 | if (stream->acache.same_array != NULL) | ||
1849 | { | ||
1850 | xd3_free (stream, stream->acache.same_array); | ||
1851 | } | ||
1852 | |||
1853 | if (((stream->acache.s_near > 0) && | ||
1854 | (stream->acache.near_array = (usize_t*) | ||
1855 | xd3_alloc (stream, stream->acache.s_near, | ||
1856 | (usize_t) sizeof (usize_t))) | ||
1857 | == NULL) || | ||
1858 | ((stream->acache.s_same > 0) && | ||
1859 | (stream->acache.same_array = (usize_t*) | ||
1860 | xd3_alloc (stream, stream->acache.s_same * 256, | ||
1861 | (usize_t) sizeof (usize_t))) | ||
1862 | == NULL)) | ||
1863 | { | ||
1864 | return ENOMEM; | ||
1865 | } | ||
1866 | |||
1867 | return 0; | ||
1868 | } | ||
1869 | |||
1870 | void | ||
1871 | xd3_init_cache (xd3_addr_cache* acache) | ||
1872 | { | ||
1873 | if (acache->s_near > 0) | ||
1874 | { | ||
1875 | memset (acache->near_array, 0, acache->s_near * sizeof (usize_t)); | ||
1876 | acache->next_slot = 0; | ||
1877 | } | ||
1878 | |||
1879 | if (acache->s_same > 0) | ||
1880 | { | ||
1881 | memset (acache->same_array, 0, acache->s_same * 256 * sizeof (usize_t)); | ||
1882 | } | ||
1883 | } | ||
1884 | |||
1885 | static void | ||
1886 | xd3_update_cache (xd3_addr_cache* acache, usize_t addr) | ||
1887 | { | ||
1888 | if (acache->s_near > 0) | ||
1889 | { | ||
1890 | acache->near_array[acache->next_slot] = addr; | ||
1891 | acache->next_slot = (acache->next_slot + 1) % acache->s_near; | ||
1892 | } | ||
1893 | |||
1894 | if (acache->s_same > 0) | ||
1895 | { | ||
1896 | acache->same_array[addr % (acache->s_same*256)] = addr; | ||
1897 | } | ||
1898 | } | ||
1899 | |||
1900 | #if XD3_ENCODER | ||
1901 | /* OPT: this gets called a lot, can it be optimized? */ | ||
1902 | static int | ||
1903 | xd3_encode_address (xd3_stream *stream, | ||
1904 | usize_t addr, | ||
1905 | usize_t here, | ||
1906 | uint8_t* mode) | ||
1907 | { | ||
1908 | usize_t d, bestd; | ||
1909 | usize_t i, bestm, ret; | ||
1910 | xd3_addr_cache* acache = & stream->acache; | ||
1911 | |||
1912 | #define SMALLEST_INT(x) do { if (((x) & ~127U) == 0) { goto good; } } while (0) | ||
1913 | |||
1914 | /* Attempt to find the address mode that yields the smallest integer value | ||
1915 | * for "d", the encoded address value, thereby minimizing the encoded size | ||
1916 | * of the address. */ | ||
1917 | bestd = addr; | ||
1918 | bestm = VCD_SELF; | ||
1919 | |||
1920 | XD3_ASSERT (addr < here); | ||
1921 | |||
1922 | SMALLEST_INT (bestd); | ||
1923 | |||
1924 | if ((d = here-addr) < bestd) | ||
1925 | { | ||
1926 | bestd = d; | ||
1927 | bestm = VCD_HERE; | ||
1928 | |||
1929 | SMALLEST_INT (bestd); | ||
1930 | } | ||
1931 | |||
1932 | for (i = 0; i < acache->s_near; i += 1) | ||
1933 | { | ||
1934 | /* Note: If we used signed computation here, we'd could compte d | ||
1935 | * and then check (d >= 0 && d < bestd). */ | ||
1936 | if (addr >= acache->near_array[i]) | ||
1937 | { | ||
1938 | d = addr - acache->near_array[i]; | ||
1939 | |||
1940 | if (d < bestd) | ||
1941 | { | ||
1942 | bestd = d; | ||
1943 | bestm = i+2; /* 2 counts the VCD_SELF, VCD_HERE modes */ | ||
1944 | |||
1945 | SMALLEST_INT (bestd); | ||
1946 | } | ||
1947 | } | ||
1948 | } | ||
1949 | |||
1950 | if (acache->s_same > 0 && | ||
1951 | acache->same_array[d = addr%(acache->s_same*256)] == addr) | ||
1952 | { | ||
1953 | bestd = d%256; | ||
1954 | /* 2 + s_near offsets past the VCD_NEAR modes */ | ||
1955 | bestm = acache->s_near + 2 + d/256; | ||
1956 | |||
1957 | if ((ret = xd3_emit_byte (stream, & ADDR_TAIL (stream), bestd))) | ||
1958 | { | ||
1959 | return ret; | ||
1960 | } | ||
1961 | } | ||
1962 | else | ||
1963 | { | ||
1964 | good: | ||
1965 | |||
1966 | if ((ret = xd3_emit_size (stream, & ADDR_TAIL (stream), bestd))) | ||
1967 | { | ||
1968 | return ret; | ||
1969 | } | ||
1970 | } | ||
1971 | |||
1972 | xd3_update_cache (acache, addr); | ||
1973 | |||
1974 | (*mode) += bestm; | ||
1975 | |||
1976 | return 0; | ||
1977 | } | ||
1978 | #endif | ||
1979 | |||
1980 | static int | ||
1981 | xd3_decode_address (xd3_stream *stream, usize_t here, | ||
1982 | usize_t mode, const uint8_t **inpp, | ||
1983 | const uint8_t *max, uint32_t *valp) | ||
1984 | { | ||
1985 | int ret; | ||
1986 | usize_t same_start = 2 + stream->acache.s_near; | ||
1987 | |||
1988 | if (mode < same_start) | ||
1989 | { | ||
1990 | if ((ret = xd3_read_size (stream, inpp, max, valp))) { return ret; } | ||
1991 | |||
1992 | switch (mode) | ||
1993 | { | ||
1994 | case VCD_SELF: | ||
1995 | break; | ||
1996 | case VCD_HERE: | ||
1997 | (*valp) = here - (*valp); | ||
1998 | break; | ||
1999 | default: | ||
2000 | (*valp) += stream->acache.near_array[mode - 2]; | ||
2001 | break; | ||
2002 | } | ||
2003 | } | ||
2004 | else | ||
2005 | { | ||
2006 | if (*inpp == max) | ||
2007 | { | ||
2008 | stream->msg = "address underflow"; | ||
2009 | return XD3_INVALID_INPUT; | ||
2010 | } | ||
2011 | |||
2012 | mode -= same_start; | ||
2013 | |||
2014 | (*valp) = stream->acache.same_array[mode*256 + (**inpp)]; | ||
2015 | |||
2016 | (*inpp) += 1; | ||
2017 | } | ||
2018 | |||
2019 | xd3_update_cache (& stream->acache, *valp); | ||
2020 | |||
2021 | return 0; | ||
2022 | } | ||
2023 | |||
2024 | /*********************************************************************** | ||
2025 | Alloc/free | ||
2026 | ***********************************************************************/ | ||
2027 | |||
2028 | static void* | ||
2029 | __xd3_alloc_func (void* opaque, usize_t items, usize_t size) | ||
2030 | { | ||
2031 | return malloc ((size_t) items * (size_t) size); | ||
2032 | } | ||
2033 | |||
2034 | static void | ||
2035 | __xd3_free_func (void* opaque, void* address) | ||
2036 | { | ||
2037 | free (address); | ||
2038 | } | ||
2039 | |||
2040 | static void* | ||
2041 | xd3_alloc (xd3_stream *stream, | ||
2042 | usize_t elts, | ||
2043 | usize_t size) | ||
2044 | { | ||
2045 | void *a = stream->alloc (stream->opaque, elts, size); | ||
2046 | |||
2047 | if (a != NULL) | ||
2048 | { | ||
2049 | IF_DEBUG (stream->alloc_cnt += 1); | ||
2050 | IF_DEBUG2 (DP(RINT "[stream %p malloc] size %u ptr %p\n", | ||
2051 | stream, elts * size, a)); | ||
2052 | } | ||
2053 | else | ||
2054 | { | ||
2055 | stream->msg = "out of memory"; | ||
2056 | } | ||
2057 | |||
2058 | return a; | ||
2059 | } | ||
2060 | |||
2061 | static void | ||
2062 | xd3_free (xd3_stream *stream, | ||
2063 | void *ptr) | ||
2064 | { | ||
2065 | if (ptr != NULL) | ||
2066 | { | ||
2067 | IF_DEBUG (stream->free_cnt += 1); | ||
2068 | XD3_ASSERT (stream->free_cnt <= stream->alloc_cnt); | ||
2069 | IF_DEBUG2 (DP(RINT "[stream %p free] %p\n", | ||
2070 | stream, ptr)); | ||
2071 | stream->free (stream->opaque, ptr); | ||
2072 | } | ||
2073 | } | ||
2074 | |||
2075 | #if XD3_ENCODER | ||
2076 | static void* | ||
2077 | xd3_alloc0 (xd3_stream *stream, | ||
2078 | usize_t elts, | ||
2079 | usize_t size) | ||
2080 | { | ||
2081 | void *a = xd3_alloc (stream, elts, size); | ||
2082 | |||
2083 | if (a != NULL) | ||
2084 | { | ||
2085 | memset (a, 0, (size_t) (elts * size)); | ||
2086 | } | ||
2087 | |||
2088 | return a; | ||
2089 | } | ||
2090 | |||
2091 | static xd3_output* | ||
2092 | xd3_alloc_output (xd3_stream *stream, | ||
2093 | xd3_output *old_output) | ||
2094 | { | ||
2095 | xd3_output *output; | ||
2096 | uint8_t *base; | ||
2097 | |||
2098 | if (stream->enc_free != NULL) | ||
2099 | { | ||
2100 | output = stream->enc_free; | ||
2101 | stream->enc_free = output->next_page; | ||
2102 | } | ||
2103 | else | ||
2104 | { | ||
2105 | if ((output = (xd3_output*) xd3_alloc (stream, 1, | ||
2106 | (usize_t) sizeof (xd3_output))) | ||
2107 | == NULL) | ||
2108 | { | ||
2109 | return NULL; | ||
2110 | } | ||
2111 | |||
2112 | if ((base = (uint8_t*) xd3_alloc (stream, XD3_ALLOCSIZE, | ||
2113 | sizeof (uint8_t))) == NULL) | ||
2114 | { | ||
2115 | xd3_free (stream, output); | ||
2116 | return NULL; | ||
2117 | } | ||
2118 | |||
2119 | output->base = base; | ||
2120 | output->avail = XD3_ALLOCSIZE; | ||
2121 | } | ||
2122 | |||
2123 | output->next = 0; | ||
2124 | |||
2125 | if (old_output) | ||
2126 | { | ||
2127 | old_output->next_page = output; | ||
2128 | } | ||
2129 | |||
2130 | output->next_page = NULL; | ||
2131 | |||
2132 | return output; | ||
2133 | } | ||
2134 | |||
2135 | static usize_t | ||
2136 | xd3_sizeof_output (xd3_output *output) | ||
2137 | { | ||
2138 | usize_t s = 0; | ||
2139 | |||
2140 | for (; output; output = output->next_page) | ||
2141 | { | ||
2142 | s += output->next; | ||
2143 | } | ||
2144 | |||
2145 | return s; | ||
2146 | } | ||
2147 | |||
2148 | static void | ||
2149 | xd3_freelist_output (xd3_stream *stream, | ||
2150 | xd3_output *output) | ||
2151 | { | ||
2152 | xd3_output *tmp; | ||
2153 | |||
2154 | while (output) | ||
2155 | { | ||
2156 | tmp = output; | ||
2157 | output = output->next_page; | ||
2158 | |||
2159 | tmp->next = 0; | ||
2160 | tmp->next_page = stream->enc_free; | ||
2161 | stream->enc_free = tmp; | ||
2162 | } | ||
2163 | } | ||
2164 | |||
2165 | static void | ||
2166 | xd3_free_output (xd3_stream *stream, | ||
2167 | xd3_output *output) | ||
2168 | { | ||
2169 | xd3_output *next; | ||
2170 | |||
2171 | again: | ||
2172 | if (output == NULL) | ||
2173 | { | ||
2174 | return; | ||
2175 | } | ||
2176 | |||
2177 | next = output->next_page; | ||
2178 | |||
2179 | xd3_free (stream, output->base); | ||
2180 | xd3_free (stream, output); | ||
2181 | |||
2182 | output = next; | ||
2183 | goto again; | ||
2184 | } | ||
2185 | #endif /* XD3_ENCODER */ | ||
2186 | |||
2187 | void | ||
2188 | xd3_free_stream (xd3_stream *stream) | ||
2189 | { | ||
2190 | xd3_iopt_buflist *blist = stream->iopt_alloc; | ||
2191 | |||
2192 | while (blist != NULL) | ||
2193 | { | ||
2194 | xd3_iopt_buflist *tmp = blist; | ||
2195 | blist = blist->next; | ||
2196 | xd3_free (stream, tmp->buffer); | ||
2197 | xd3_free (stream, tmp); | ||
2198 | } | ||
2199 | |||
2200 | xd3_free (stream, stream->large_table); | ||
2201 | xd3_free (stream, stream->small_table); | ||
2202 | xd3_free (stream, stream->small_prev); | ||
2203 | |||
2204 | #if XD3_ENCODER | ||
2205 | { | ||
2206 | int i; | ||
2207 | for (i = 0; i < ENC_SECTS; i += 1) | ||
2208 | { | ||
2209 | xd3_free_output (stream, stream->enc_heads[i]); | ||
2210 | } | ||
2211 | xd3_free_output (stream, stream->enc_free); | ||
2212 | } | ||
2213 | #endif | ||
2214 | |||
2215 | xd3_free (stream, stream->acache.near_array); | ||
2216 | xd3_free (stream, stream->acache.same_array); | ||
2217 | |||
2218 | xd3_free (stream, stream->inst_sect.copied1); | ||
2219 | xd3_free (stream, stream->addr_sect.copied1); | ||
2220 | xd3_free (stream, stream->data_sect.copied1); | ||
2221 | |||
2222 | xd3_free (stream, stream->dec_buffer); | ||
2223 | xd3_free (stream, (uint8_t*) stream->dec_lastwin); | ||
2224 | |||
2225 | xd3_free (stream, stream->buf_in); | ||
2226 | xd3_free (stream, stream->dec_appheader); | ||
2227 | xd3_free (stream, stream->dec_codetbl); | ||
2228 | xd3_free (stream, stream->code_table_alloc); | ||
2229 | |||
2230 | #if SECONDARY_ANY | ||
2231 | xd3_free (stream, stream->inst_sect.copied2); | ||
2232 | xd3_free (stream, stream->addr_sect.copied2); | ||
2233 | xd3_free (stream, stream->data_sect.copied2); | ||
2234 | |||
2235 | if (stream->sec_type != NULL) | ||
2236 | { | ||
2237 | stream->sec_type->destroy (stream, stream->sec_stream_d); | ||
2238 | stream->sec_type->destroy (stream, stream->sec_stream_i); | ||
2239 | stream->sec_type->destroy (stream, stream->sec_stream_a); | ||
2240 | } | ||
2241 | #endif | ||
2242 | |||
2243 | xd3_free (stream, stream->whole_target.adds); | ||
2244 | xd3_free (stream, stream->whole_target.inst); | ||
2245 | xd3_free (stream, stream->whole_target.wininfo); | ||
2246 | |||
2247 | XD3_ASSERT (stream->alloc_cnt == stream->free_cnt); | ||
2248 | |||
2249 | memset (stream, 0, sizeof (xd3_stream)); | ||
2250 | } | ||
2251 | |||
2252 | #if (XD3_DEBUG > 1 || VCDIFF_TOOLS) | ||
2253 | static const char* | ||
2254 | xd3_rtype_to_string (xd3_rtype type, int print_mode) | ||
2255 | { | ||
2256 | switch (type) | ||
2257 | { | ||
2258 | case XD3_NOOP: | ||
2259 | return "NOOP "; | ||
2260 | case XD3_RUN: | ||
2261 | return "RUN "; | ||
2262 | case XD3_ADD: | ||
2263 | return "ADD "; | ||
2264 | default: break; | ||
2265 | } | ||
2266 | if (! print_mode) | ||
2267 | { | ||
2268 | return "CPY "; | ||
2269 | } | ||
2270 | switch (type) | ||
2271 | { | ||
2272 | case XD3_CPY + 0: return "CPY_0"; | ||
2273 | case XD3_CPY + 1: return "CPY_1"; | ||
2274 | case XD3_CPY + 2: return "CPY_2"; | ||
2275 | case XD3_CPY + 3: return "CPY_3"; | ||
2276 | case XD3_CPY + 4: return "CPY_4"; | ||
2277 | case XD3_CPY + 5: return "CPY_5"; | ||
2278 | case XD3_CPY + 6: return "CPY_6"; | ||
2279 | case XD3_CPY + 7: return "CPY_7"; | ||
2280 | case XD3_CPY + 8: return "CPY_8"; | ||
2281 | case XD3_CPY + 9: return "CPY_9"; | ||
2282 | default: return "CPY>9"; | ||
2283 | } | ||
2284 | } | ||
2285 | #endif | ||
2286 | |||
2287 | /**************************************************************** | ||
2288 | Stream configuration | ||
2289 | ******************************************************************/ | ||
2290 | |||
2291 | int | ||
2292 | xd3_config_stream(xd3_stream *stream, | ||
2293 | xd3_config *config) | ||
2294 | { | ||
2295 | int ret; | ||
2296 | xd3_config defcfg; | ||
2297 | xd3_smatcher *smatcher = &stream->smatcher; | ||
2298 | |||
2299 | if (config == NULL) | ||
2300 | { | ||
2301 | config = & defcfg; | ||
2302 | memset (config, 0, sizeof (*config)); | ||
2303 | } | ||
2304 | |||
2305 | /* Initial setup: no error checks yet */ | ||
2306 | memset (stream, 0, sizeof (*stream)); | ||
2307 | |||
2308 | stream->winsize = config->winsize ? config->winsize : XD3_DEFAULT_WINSIZE; | ||
2309 | stream->sprevsz = config->sprevsz ? config->sprevsz : XD3_DEFAULT_SPREVSZ; | ||
2310 | stream->srcwin_maxsz = config->srcwin_maxsz ? | ||
2311 | config->srcwin_maxsz : XD3_DEFAULT_SRCWINSZ; | ||
2312 | |||
2313 | if (config->iopt_size == 0) | ||
2314 | { | ||
2315 | stream->iopt_size = XD3_ALLOCSIZE / sizeof(xd3_rinst); | ||
2316 | stream->iopt_unlimited = 1; | ||
2317 | } | ||
2318 | else | ||
2319 | { | ||
2320 | stream->iopt_size = config->iopt_size; | ||
2321 | } | ||
2322 | |||
2323 | stream->getblk = config->getblk; | ||
2324 | stream->alloc = config->alloc ? config->alloc : __xd3_alloc_func; | ||
2325 | stream->free = config->freef ? config->freef : __xd3_free_func; | ||
2326 | stream->opaque = config->opaque; | ||
2327 | stream->flags = config->flags; | ||
2328 | |||
2329 | /* Secondary setup. */ | ||
2330 | stream->sec_data = config->sec_data; | ||
2331 | stream->sec_inst = config->sec_inst; | ||
2332 | stream->sec_addr = config->sec_addr; | ||
2333 | |||
2334 | stream->sec_data.data_type = DATA_SECTION; | ||
2335 | stream->sec_inst.data_type = INST_SECTION; | ||
2336 | stream->sec_addr.data_type = ADDR_SECTION; | ||
2337 | |||
2338 | /* Check static sizes. */ | ||
2339 | if (sizeof (usize_t) != SIZEOF_USIZE_T || | ||
2340 | sizeof (xoff_t) != SIZEOF_XOFF_T || | ||
2341 | (ret = xd3_check_pow2(XD3_ALLOCSIZE, NULL))) | ||
2342 | { | ||
2343 | stream->msg = "incorrect compilation: wrong integer sizes"; | ||
2344 | return XD3_INTERNAL; | ||
2345 | } | ||
2346 | |||
2347 | /* Check/set secondary compressor. */ | ||
2348 | switch (stream->flags & XD3_SEC_TYPE) | ||
2349 | { | ||
2350 | case 0: | ||
2351 | if (stream->flags & XD3_SEC_NOALL) | ||
2352 | { | ||
2353 | stream->msg = "XD3_SEC flags require a secondary compressor type"; | ||
2354 | return XD3_INTERNAL; | ||
2355 | } | ||
2356 | break; | ||
2357 | case XD3_SEC_FGK: | ||
2358 | FGK_CASE (stream); | ||
2359 | case XD3_SEC_DJW: | ||
2360 | DJW_CASE (stream); | ||
2361 | default: | ||
2362 | stream->msg = "too many secondary compressor types set"; | ||
2363 | return XD3_INTERNAL; | ||
2364 | } | ||
2365 | |||
2366 | /* Check/set encoder code table. */ | ||
2367 | switch (stream->flags & XD3_ALT_CODE_TABLE) { | ||
2368 | case 0: | ||
2369 | stream->code_table_desc = & __rfc3284_code_table_desc; | ||
2370 | stream->code_table_func = xd3_rfc3284_code_table; | ||
2371 | break; | ||
2372 | #if GENERIC_ENCODE_TABLES | ||
2373 | case XD3_ALT_CODE_TABLE: | ||
2374 | stream->code_table_desc = & __alternate_code_table_desc; | ||
2375 | stream->code_table_func = xd3_alternate_code_table; | ||
2376 | stream->comp_table_func = xd3_compute_alternate_table_encoding; | ||
2377 | break; | ||
2378 | #endif | ||
2379 | default: | ||
2380 | stream->msg = "alternate code table support was not compiled"; | ||
2381 | return XD3_INTERNAL; | ||
2382 | } | ||
2383 | |||
2384 | /* Check sprevsz */ | ||
2385 | if (smatcher->small_chain == 1 && | ||
2386 | smatcher->small_lchain == 1) | ||
2387 | { | ||
2388 | stream->sprevsz = 0; | ||
2389 | } | ||
2390 | else | ||
2391 | { | ||
2392 | if ((ret = xd3_check_pow2 (stream->sprevsz, NULL))) | ||
2393 | { | ||
2394 | stream->msg = "sprevsz is required to be a power of two"; | ||
2395 | return XD3_INTERNAL; | ||
2396 | } | ||
2397 | |||
2398 | stream->sprevmask = stream->sprevsz - 1; | ||
2399 | } | ||
2400 | |||
2401 | /* Default scanner settings. */ | ||
2402 | #if XD3_ENCODER | ||
2403 | switch (config->smatch_cfg) | ||
2404 | { | ||
2405 | IF_BUILD_SOFT(case XD3_SMATCH_SOFT: | ||
2406 | { | ||
2407 | *smatcher = config->smatcher_soft; | ||
2408 | smatcher->string_match = __smatcher_soft.string_match; | ||
2409 | smatcher->name = __smatcher_soft.name; | ||
2410 | if (smatcher->large_look < MIN_MATCH || | ||
2411 | smatcher->large_step < 1 || | ||
2412 | smatcher->small_look < MIN_MATCH) | ||
2413 | { | ||
2414 | stream->msg = "invalid soft string-match config"; | ||
2415 | return XD3_INVALID; | ||
2416 | } | ||
2417 | break; | ||
2418 | }) | ||
2419 | |||
2420 | IF_BUILD_DEFAULT(case XD3_SMATCH_DEFAULT: | ||
2421 | *smatcher = __smatcher_default; | ||
2422 | break;) | ||
2423 | IF_BUILD_SLOW(case XD3_SMATCH_SLOW: | ||
2424 | *smatcher = __smatcher_slow; | ||
2425 | break;) | ||
2426 | IF_BUILD_FASTEST(case XD3_SMATCH_FASTEST: | ||
2427 | *smatcher = __smatcher_fastest; | ||
2428 | break;) | ||
2429 | IF_BUILD_FASTER(case XD3_SMATCH_FASTER: | ||
2430 | *smatcher = __smatcher_faster; | ||
2431 | break;) | ||
2432 | IF_BUILD_FAST(case XD3_SMATCH_FAST: | ||
2433 | *smatcher = __smatcher_fast; | ||
2434 | break;) | ||
2435 | default: | ||
2436 | stream->msg = "invalid string match config type"; | ||
2437 | return XD3_INTERNAL; | ||
2438 | } | ||
2439 | |||
2440 | if (config->smatch_cfg == XD3_SMATCH_DEFAULT && | ||
2441 | (stream->flags & XD3_COMPLEVEL_MASK) != 0) | ||
2442 | { | ||
2443 | int level = (stream->flags & XD3_COMPLEVEL_MASK) >> XD3_COMPLEVEL_SHIFT; | ||
2444 | |||
2445 | switch (level) | ||
2446 | { | ||
2447 | case 1: | ||
2448 | IF_BUILD_FASTEST(*smatcher = __smatcher_fastest; | ||
2449 | break;) | ||
2450 | case 2: | ||
2451 | IF_BUILD_FASTER(*smatcher = __smatcher_faster; | ||
2452 | break;) | ||
2453 | case 3: case 4: case 5: | ||
2454 | IF_BUILD_FAST(*smatcher = __smatcher_fast; | ||
2455 | break;) | ||
2456 | case 6: | ||
2457 | IF_BUILD_DEFAULT(*smatcher = __smatcher_default; | ||
2458 | break;) | ||
2459 | default: | ||
2460 | IF_BUILD_SLOW(*smatcher = __smatcher_slow; | ||
2461 | break;) | ||
2462 | IF_BUILD_DEFAULT(*smatcher = __smatcher_default; | ||
2463 | break;) | ||
2464 | IF_BUILD_FAST(*smatcher = __smatcher_fast; | ||
2465 | break;) | ||
2466 | IF_BUILD_FASTER(*smatcher = __smatcher_faster; | ||
2467 | break;) | ||
2468 | IF_BUILD_FASTEST(*smatcher = __smatcher_fastest; | ||
2469 | break;) | ||
2470 | } | ||
2471 | } | ||
2472 | #endif | ||
2473 | |||
2474 | return 0; | ||
2475 | } | ||
2476 | |||
2477 | /*********************************************************** | ||
2478 | Getblk interface | ||
2479 | ***********************************************************/ | ||
2480 | |||
2481 | inline | ||
2482 | xoff_t xd3_source_eof(const xd3_source *src) | ||
2483 | { | ||
2484 | xoff_t r = (src->blksize * src->max_blkno) + (xoff_t)src->onlastblk; | ||
2485 | return r; | ||
2486 | } | ||
2487 | |||
2488 | inline | ||
2489 | usize_t xd3_bytes_on_srcblk (xd3_source *src, xoff_t blkno) | ||
2490 | { | ||
2491 | usize_t r = (blkno == src->max_blkno ? | ||
2492 | src->onlastblk : | ||
2493 | src->blksize); | ||
2494 | return r; | ||
2495 | } | ||
2496 | |||
2497 | /* This function interfaces with the client getblk function, checks | ||
2498 | * its results, updates frontier_blkno, max_blkno, onlastblk, eof_known. */ | ||
2499 | static int | ||
2500 | xd3_getblk (xd3_stream *stream, xoff_t blkno) | ||
2501 | { | ||
2502 | int ret; | ||
2503 | xd3_source *source = stream->src; | ||
2504 | |||
2505 | if (source->curblk == NULL || blkno != source->curblkno) | ||
2506 | { | ||
2507 | source->getblkno = blkno; | ||
2508 | |||
2509 | if (stream->getblk == NULL) | ||
2510 | { | ||
2511 | stream->msg = "getblk source input"; | ||
2512 | return XD3_GETSRCBLK; | ||
2513 | } | ||
2514 | |||
2515 | ret = stream->getblk (stream, source, blkno); | ||
2516 | if (ret != 0) | ||
2517 | { | ||
2518 | IF_DEBUG1 (DP(RINT "[getblk] app error blkno %"Q"u: %s\n", | ||
2519 | blkno, xd3_strerror (ret))); | ||
2520 | return ret; | ||
2521 | } | ||
2522 | } | ||
2523 | |||
2524 | if (blkno >= source->frontier_blkno) | ||
2525 | { | ||
2526 | if (blkno > source->max_blkno) | ||
2527 | { | ||
2528 | source->max_blkno = blkno; | ||
2529 | source->onlastblk = source->onblk; | ||
2530 | } | ||
2531 | |||
2532 | if (source->onblk == source->blksize) | ||
2533 | { | ||
2534 | source->frontier_blkno = blkno + 1; | ||
2535 | |||
2536 | IF_DEBUG2 (DP(RINT "[getblk] full source blkno %"Q"u: " | ||
2537 | "source length unknown %"Q"u\n", | ||
2538 | blkno, | ||
2539 | xd3_source_eof (source))); | ||
2540 | } | ||
2541 | else | ||
2542 | { | ||
2543 | if (!source->eof_known) | ||
2544 | { | ||
2545 | IF_DEBUG2 (DP(RINT "[getblk] eof block has %d bytes; " | ||
2546 | "source length known %"Q"u\n", | ||
2547 | xd3_bytes_on_srcblk (source, blkno), | ||
2548 | xd3_source_eof (source))); | ||
2549 | source->eof_known = 1; | ||
2550 | } | ||
2551 | |||
2552 | source->frontier_blkno = blkno; | ||
2553 | } | ||
2554 | } | ||
2555 | |||
2556 | XD3_ASSERT (source->curblk != NULL); | ||
2557 | IF_DEBUG2 (DP(RINT "[getblk] read source block %"Q"u onblk %u blksize %u\n", | ||
2558 | blkno, source->onblk, source->blksize)); | ||
2559 | |||
2560 | if (blkno == source->max_blkno) | ||
2561 | { | ||
2562 | /* In case the application sets the source as 1 block w/ a | ||
2563 | preset buffer. */ | ||
2564 | source->onlastblk = source->onblk; | ||
2565 | |||
2566 | if (source->onblk == source->blksize) | ||
2567 | { | ||
2568 | source->frontier_blkno = blkno + 1; | ||
2569 | } | ||
2570 | } | ||
2571 | return 0; | ||
2572 | } | ||
2573 | |||
2574 | /*********************************************************** | ||
2575 | Stream open/close | ||
2576 | ***************************************************************/ | ||
2577 | |||
2578 | int | ||
2579 | xd3_set_source (xd3_stream *stream, | ||
2580 | xd3_source *src) | ||
2581 | { | ||
2582 | usize_t shiftby; | ||
2583 | |||
2584 | stream->src = src; | ||
2585 | src->srclen = 0; | ||
2586 | src->srcbase = 0; | ||
2587 | |||
2588 | /* Enforce power-of-two blocksize so that source-block number | ||
2589 | * calculations are cheap. */ | ||
2590 | if (!xd3_check_pow2 (src->blksize, &shiftby) == 0) | ||
2591 | { | ||
2592 | int check; | ||
2593 | src->blksize = xd3_pow2_roundup(src->blksize); | ||
2594 | check = xd3_check_pow2 (src->blksize, &shiftby); | ||
2595 | XD3_ASSERT (check == 0); | ||
2596 | IF_DEBUG1 (DP(RINT "raising srcblksz to %u\n", src->blksize)); | ||
2597 | } | ||
2598 | |||
2599 | src->shiftby = shiftby; | ||
2600 | src->maskby = (1 << shiftby) - 1; | ||
2601 | return 0; | ||
2602 | } | ||
2603 | |||
2604 | int | ||
2605 | xd3_set_source_and_size (xd3_stream *stream, | ||
2606 | xd3_source *user_source, | ||
2607 | xoff_t source_size) { | ||
2608 | int ret = xd3_set_source (stream, user_source); | ||
2609 | if (ret == 0) | ||
2610 | { | ||
2611 | stream->src->eof_known = 1; | ||
2612 | IF_DEBUG2 (DP(RINT "[set source] size known %"Q"u\n", | ||
2613 | source_size)); | ||
2614 | |||
2615 | xd3_blksize_div(source_size, | ||
2616 | stream->src, | ||
2617 | &stream->src->max_blkno, | ||
2618 | &stream->src->onlastblk); | ||
2619 | } | ||
2620 | return ret; | ||
2621 | } | ||
2622 | |||
2623 | void | ||
2624 | xd3_abort_stream (xd3_stream *stream) | ||
2625 | { | ||
2626 | stream->dec_state = DEC_ABORTED; | ||
2627 | stream->enc_state = ENC_ABORTED; | ||
2628 | } | ||
2629 | |||
2630 | int | ||
2631 | xd3_close_stream (xd3_stream *stream) | ||
2632 | { | ||
2633 | if (stream->enc_state != 0 && stream->enc_state != ENC_ABORTED) | ||
2634 | { | ||
2635 | if (stream->buf_leftover != NULL) | ||
2636 | { | ||
2637 | stream->msg = "encoding is incomplete"; | ||
2638 | return XD3_INTERNAL; | ||
2639 | } | ||
2640 | |||
2641 | if (stream->enc_state == ENC_POSTWIN) | ||
2642 | { | ||
2643 | #if XD3_ENCODER | ||
2644 | xd3_encode_reset (stream); | ||
2645 | #endif | ||
2646 | stream->current_window += 1; | ||
2647 | stream->enc_state = ENC_INPUT; | ||
2648 | } | ||
2649 | |||
2650 | /* If encoding, should be ready for more input but not actually | ||
2651 | have any. */ | ||
2652 | if (stream->enc_state != ENC_INPUT || stream->avail_in != 0) | ||
2653 | { | ||
2654 | stream->msg = "encoding is incomplete"; | ||
2655 | return XD3_INTERNAL; | ||
2656 | } | ||
2657 | } | ||
2658 | else | ||
2659 | { | ||
2660 | switch (stream->dec_state) | ||
2661 | { | ||
2662 | case DEC_VCHEAD: | ||
2663 | case DEC_WININD: | ||
2664 | /* TODO: Address the zero-byte ambiguity. Does the encoder | ||
2665 | * emit a window or not? If so, then catch an error here. | ||
2666 | * If not, need another routine to say | ||
2667 | * decode_at_least_one_if_empty. */ | ||
2668 | case DEC_ABORTED: | ||
2669 | break; | ||
2670 | default: | ||
2671 | /* If decoding, should be ready for the next window. */ | ||
2672 | stream->msg = "EOF in decode"; | ||
2673 | return XD3_INTERNAL; | ||
2674 | } | ||
2675 | } | ||
2676 | |||
2677 | return 0; | ||
2678 | } | ||
2679 | |||
2680 | /************************************************************** | ||
2681 | Application header | ||
2682 | ****************************************************************/ | ||
2683 | |||
2684 | int | ||
2685 | xd3_get_appheader (xd3_stream *stream, | ||
2686 | uint8_t **data, | ||
2687 | usize_t *size) | ||
2688 | { | ||
2689 | if (stream->dec_state < DEC_WININD) | ||
2690 | { | ||
2691 | stream->msg = "application header not available"; | ||
2692 | return XD3_INTERNAL; | ||
2693 | } | ||
2694 | |||
2695 | (*data) = stream->dec_appheader; | ||
2696 | (*size) = stream->dec_appheadsz; | ||
2697 | return 0; | ||
2698 | } | ||
2699 | |||
2700 | /********************************************************** | ||
2701 | Decoder stuff | ||
2702 | *************************************************/ | ||
2703 | |||
2704 | #include "xdelta3-decode.h" | ||
2705 | |||
2706 | /**************************************************************** | ||
2707 | Encoder stuff | ||
2708 | *****************************************************************/ | ||
2709 | |||
2710 | #if XD3_ENCODER | ||
2711 | void | ||
2712 | xd3_set_appheader (xd3_stream *stream, | ||
2713 | const uint8_t *data, | ||
2714 | usize_t size) | ||
2715 | { | ||
2716 | stream->enc_appheader = data; | ||
2717 | stream->enc_appheadsz = size; | ||
2718 | } | ||
2719 | |||
2720 | #if XD3_DEBUG | ||
2721 | static int | ||
2722 | xd3_iopt_check (xd3_stream *stream) | ||
2723 | { | ||
2724 | usize_t ul = xd3_rlist_length (& stream->iopt_used); | ||
2725 | usize_t fl = xd3_rlist_length (& stream->iopt_free); | ||
2726 | |||
2727 | return (ul + fl + (stream->iout ? 1 : 0)) == stream->iopt_size; | ||
2728 | } | ||
2729 | #endif | ||
2730 | |||
2731 | static xd3_rinst* | ||
2732 | xd3_iopt_free (xd3_stream *stream, xd3_rinst *i) | ||
2733 | { | ||
2734 | xd3_rinst *n = xd3_rlist_remove (i); | ||
2735 | xd3_rlist_push_back (& stream->iopt_free, i); | ||
2736 | return n; | ||
2737 | } | ||
2738 | |||
2739 | static void | ||
2740 | xd3_iopt_free_nonadd (xd3_stream *stream, xd3_rinst *i) | ||
2741 | { | ||
2742 | if (i->type != XD3_ADD) | ||
2743 | { | ||
2744 | xd3_rlist_push_back (& stream->iopt_free, i); | ||
2745 | } | ||
2746 | } | ||
2747 | |||
2748 | /* When an instruction is ready to flush from the iopt buffer, this | ||
2749 | * function is called to produce an encoding. It writes the | ||
2750 | * instruction plus size, address, and data to the various encoding | ||
2751 | * sections. */ | ||
2752 | static int | ||
2753 | xd3_iopt_finish_encoding (xd3_stream *stream, xd3_rinst *inst) | ||
2754 | { | ||
2755 | int ret; | ||
2756 | |||
2757 | /* Check for input overflow. */ | ||
2758 | XD3_ASSERT (inst->pos + inst->size <= stream->avail_in); | ||
2759 | |||
2760 | switch (inst->type) | ||
2761 | { | ||
2762 | case XD3_CPY: | ||
2763 | { | ||
2764 | /* the address may have an offset if there is a source window. */ | ||
2765 | usize_t addr; | ||
2766 | xd3_source *src = stream->src; | ||
2767 | |||
2768 | if (src != NULL) | ||
2769 | { | ||
2770 | /* If there is a source copy, the source must have its | ||
2771 | * source window decided before we can encode. This can | ||
2772 | * be bad -- we have to make this decision even if no | ||
2773 | * source matches have been found. */ | ||
2774 | if (stream->srcwin_decided == 0) | ||
2775 | { | ||
2776 | if ((ret = xd3_srcwin_setup (stream))) { return ret; } | ||
2777 | } | ||
2778 | else | ||
2779 | { | ||
2780 | stream->srcwin_decided_early = (!stream->src->eof_known || | ||
2781 | (stream->srcwin_cksum_pos < | ||
2782 | xd3_source_eof (stream->src))); | ||
2783 | } | ||
2784 | |||
2785 | /* xtra field indicates the copy is from the source */ | ||
2786 | if (inst->xtra) | ||
2787 | { | ||
2788 | XD3_ASSERT (inst->addr >= src->srcbase); | ||
2789 | XD3_ASSERT (inst->addr + inst->size <= | ||
2790 | src->srcbase + src->srclen); | ||
2791 | addr = (usize_t)(inst->addr - src->srcbase); | ||
2792 | stream->n_scpy += 1; | ||
2793 | stream->l_scpy += (xoff_t) inst->size; | ||
2794 | } | ||
2795 | else | ||
2796 | { | ||
2797 | /* with source window: target copy address is offset | ||
2798 | * by taroff. */ | ||
2799 | addr = stream->taroff + (usize_t) inst->addr; | ||
2800 | stream->n_tcpy += 1; | ||
2801 | stream->l_tcpy += (xoff_t) inst->size; | ||
2802 | } | ||
2803 | } | ||
2804 | else | ||
2805 | { | ||
2806 | addr = (usize_t) inst->addr; | ||
2807 | stream->n_tcpy += 1; | ||
2808 | stream->l_tcpy += inst->size; | ||
2809 | } | ||
2810 | |||
2811 | /* Note: used to assert inst->size >= MIN_MATCH, but not true | ||
2812 | * for merge operations & identical match heuristics. */ | ||
2813 | /* the "here" position is always offset by taroff */ | ||
2814 | if ((ret = xd3_encode_address (stream, addr, inst->pos + stream->taroff, | ||
2815 | & inst->type))) | ||
2816 | { | ||
2817 | return ret; | ||
2818 | } | ||
2819 | |||
2820 | IF_DEBUG2 ({ | ||
2821 | static int cnt; | ||
2822 | DP(RINT "[iopt copy:%d] pos %"Q"u-%"Q"u addr %"Q"u-%"Q"u size %u\n", | ||
2823 | cnt++, | ||
2824 | stream->total_in + inst->pos, | ||
2825 | stream->total_in + inst->pos + inst->size, | ||
2826 | inst->addr, inst->addr + inst->size, inst->size); | ||
2827 | }); | ||
2828 | break; | ||
2829 | } | ||
2830 | case XD3_RUN: | ||
2831 | { | ||
2832 | XD3_ASSERT (inst->size >= MIN_MATCH); | ||
2833 | |||
2834 | if ((ret = xd3_emit_byte (stream, & DATA_TAIL (stream), inst->xtra))) { return ret; } | ||
2835 | |||
2836 | stream->n_run += 1; | ||
2837 | stream->l_run += inst->size; | ||
2838 | |||
2839 | IF_DEBUG2 ({ | ||
2840 | static int cnt; | ||
2841 | DP(RINT "[iopt run:%d] pos %"Q"u size %u\n", cnt++, stream->total_in + inst->pos, inst->size); | ||
2842 | }); | ||
2843 | break; | ||
2844 | } | ||
2845 | case XD3_ADD: | ||
2846 | { | ||
2847 | if ((ret = xd3_emit_bytes (stream, & DATA_TAIL (stream), | ||
2848 | stream->next_in + inst->pos, inst->size))) { return ret; } | ||
2849 | |||
2850 | stream->n_add += 1; | ||
2851 | stream->l_add += inst->size; | ||
2852 | |||
2853 | IF_DEBUG2 ({ | ||
2854 | static int cnt; | ||
2855 | DP(RINT "[iopt add:%d] pos %"Q"u size %u\n", cnt++, stream->total_in + inst->pos, inst->size); | ||
2856 | }); | ||
2857 | |||
2858 | break; | ||
2859 | } | ||
2860 | } | ||
2861 | |||
2862 | /* This is the only place stream->unencoded_offset is incremented. */ | ||
2863 | XD3_ASSERT (stream->unencoded_offset == inst->pos); | ||
2864 | stream->unencoded_offset += inst->size; | ||
2865 | |||
2866 | inst->code2 = 0; | ||
2867 | |||
2868 | XD3_CHOOSE_INSTRUCTION (stream, stream->iout, inst); | ||
2869 | |||
2870 | if (stream->iout != NULL) | ||
2871 | { | ||
2872 | if (stream->iout->code2 != 0) | ||
2873 | { | ||
2874 | if ((ret = xd3_emit_double (stream, stream->iout, inst, stream->iout->code2))) { return ret; } | ||
2875 | |||
2876 | xd3_iopt_free_nonadd (stream, stream->iout); | ||
2877 | xd3_iopt_free_nonadd (stream, inst); | ||
2878 | stream->iout = NULL; | ||
2879 | return 0; | ||
2880 | } | ||
2881 | else | ||
2882 | { | ||
2883 | if ((ret = xd3_emit_single (stream, stream->iout, stream->iout->code1))) { return ret; } | ||
2884 | |||
2885 | xd3_iopt_free_nonadd (stream, stream->iout); | ||
2886 | } | ||
2887 | } | ||
2888 | |||
2889 | stream->iout = inst; | ||
2890 | |||
2891 | return 0; | ||
2892 | } | ||
2893 | |||
2894 | /* This possibly encodes an add instruction, iadd, which must remain | ||
2895 | * on the stack until the following call to | ||
2896 | * xd3_iopt_finish_encoding. */ | ||
2897 | static int | ||
2898 | xd3_iopt_add (xd3_stream *stream, usize_t pos, xd3_rinst *iadd) | ||
2899 | { | ||
2900 | int ret; | ||
2901 | usize_t off = stream->unencoded_offset; | ||
2902 | |||
2903 | if (pos > off) | ||
2904 | { | ||
2905 | iadd->type = XD3_ADD; | ||
2906 | iadd->pos = off; | ||
2907 | iadd->size = pos - off; | ||
2908 | |||
2909 | if ((ret = xd3_iopt_finish_encoding (stream, iadd))) { return ret; } | ||
2910 | } | ||
2911 | |||
2912 | return 0; | ||
2913 | } | ||
2914 | |||
2915 | /* This function calls xd3_iopt_finish_encoding to finish encoding an | ||
2916 | * instruction, and it may also produce an add instruction for an | ||
2917 | * unmatched region. */ | ||
2918 | static int | ||
2919 | xd3_iopt_add_encoding (xd3_stream *stream, xd3_rinst *inst) | ||
2920 | { | ||
2921 | int ret; | ||
2922 | xd3_rinst iadd; | ||
2923 | |||
2924 | if ((ret = xd3_iopt_add (stream, inst->pos, & iadd))) { return ret; } | ||
2925 | |||
2926 | if ((ret = xd3_iopt_finish_encoding (stream, inst))) { return ret; } | ||
2927 | |||
2928 | return 0; | ||
2929 | } | ||
2930 | |||
2931 | /* Generates a final add instruction to encode the remaining input. */ | ||
2932 | static int | ||
2933 | xd3_iopt_add_finalize (xd3_stream *stream) | ||
2934 | { | ||
2935 | int ret; | ||
2936 | xd3_rinst iadd; | ||
2937 | |||
2938 | if ((ret = xd3_iopt_add (stream, stream->avail_in, & iadd))) { return ret; } | ||
2939 | |||
2940 | if (stream->iout) | ||
2941 | { | ||
2942 | if ((ret = xd3_emit_single (stream, stream->iout, stream->iout->code1))) { return ret; } | ||
2943 | |||
2944 | xd3_iopt_free_nonadd (stream, stream->iout); | ||
2945 | stream->iout = NULL; | ||
2946 | } | ||
2947 | |||
2948 | return 0; | ||
2949 | } | ||
2950 | |||
2951 | /* Compact the instruction buffer by choosing the best non-overlapping | ||
2952 | * instructions when lazy string-matching. There are no ADDs in the | ||
2953 | * iopt buffer because those are synthesized in xd3_iopt_add_encoding | ||
2954 | * and during xd3_iopt_add_finalize. */ | ||
2955 | static int | ||
2956 | xd3_iopt_flush_instructions (xd3_stream *stream, int force) | ||
2957 | { | ||
2958 | xd3_rinst *r1 = xd3_rlist_front (& stream->iopt_used); | ||
2959 | xd3_rinst *r2; | ||
2960 | xd3_rinst *r3; | ||
2961 | usize_t r1end; | ||
2962 | usize_t r2end; | ||
2963 | usize_t r2off; | ||
2964 | usize_t r2moff; | ||
2965 | usize_t gap; | ||
2966 | usize_t flushed; | ||
2967 | int ret; | ||
2968 | |||
2969 | XD3_ASSERT (xd3_iopt_check (stream)); | ||
2970 | |||
2971 | /* Note: once tried to skip this step if it's possible to assert | ||
2972 | * there are no overlapping instructions. Doesn't work because | ||
2973 | * xd3_opt_erase leaves overlapping instructions. */ | ||
2974 | while (! xd3_rlist_end (& stream->iopt_used, r1) && | ||
2975 | ! xd3_rlist_end (& stream->iopt_used, r2 = xd3_rlist_next (r1))) | ||
2976 | { | ||
2977 | r1end = r1->pos + r1->size; | ||
2978 | |||
2979 | /* If the instructions do not overlap, continue. */ | ||
2980 | if (r1end <= r2->pos) | ||
2981 | { | ||
2982 | r1 = r2; | ||
2983 | continue; | ||
2984 | } | ||
2985 | |||
2986 | r2end = r2->pos + r2->size; | ||
2987 | |||
2988 | /* The min_match adjustments prevent this. */ | ||
2989 | XD3_ASSERT (r2end > (r1end + LEAST_MATCH_INCR)); | ||
2990 | |||
2991 | /* If r3 is available... */ | ||
2992 | if (! xd3_rlist_end (& stream->iopt_used, r3 = xd3_rlist_next (r2))) | ||
2993 | { | ||
2994 | /* If r3 starts before r1 finishes or just about, r2 is irrelevant */ | ||
2995 | if (r3->pos <= r1end + 1) | ||
2996 | { | ||
2997 | xd3_iopt_free (stream, r2); | ||
2998 | continue; | ||
2999 | } | ||
3000 | } | ||
3001 | else if (! force) | ||
3002 | { | ||
3003 | /* Unless force, end the loop when r3 is not available. */ | ||
3004 | break; | ||
3005 | } | ||
3006 | |||
3007 | r2off = r2->pos - r1->pos; | ||
3008 | r2moff = r2end - r1end; | ||
3009 | gap = r2end - r1->pos; | ||
3010 | |||
3011 | /* If the two matches overlap almost entirely, choose the better match | ||
3012 | * and discard the other. The else branch can still create inefficient | ||
3013 | * copies, e.g., a 4-byte copy that takes 4 bytes to encode, which | ||
3014 | * xd3_smatch() wouldn't allow by its crude efficiency check. However, | ||
3015 | * in this case there are adjacent copies which mean the add would cost | ||
3016 | * one extra byte. Allow the inefficiency here. */ | ||
3017 | if (gap < 2*MIN_MATCH || r2moff <= 2 || r2off <= 2) | ||
3018 | { | ||
3019 | /* Only one match should be used, choose the longer one. */ | ||
3020 | if (r1->size < r2->size) | ||
3021 | { | ||
3022 | xd3_iopt_free (stream, r1); | ||
3023 | r1 = r2; | ||
3024 | } | ||
3025 | else | ||
3026 | { | ||
3027 | /* We are guaranteed that r1 does not overlap now, so advance past r2 */ | ||
3028 | r1 = xd3_iopt_free (stream, r2); | ||
3029 | } | ||
3030 | continue; | ||
3031 | } | ||
3032 | else | ||
3033 | { | ||
3034 | /* Shorten one of the instructions -- could be optimized | ||
3035 | * based on the address cache. */ | ||
3036 | usize_t average; | ||
3037 | usize_t newsize; | ||
3038 | usize_t adjust1; | ||
3039 | |||
3040 | XD3_ASSERT (r1end > r2->pos && r2end > r1->pos); | ||
3041 | |||
3042 | /* Try to balance the length of both instructions, but avoid | ||
3043 | * making both longer than MAX_MATCH_SPLIT . */ | ||
3044 | average = gap / 2; | ||
3045 | newsize = min (MAX_MATCH_SPLIT, gap - average); | ||
3046 | |||
3047 | /* Should be possible to simplify this code. */ | ||
3048 | if (newsize > r1->size) | ||
3049 | { | ||
3050 | /* shorten r2 */ | ||
3051 | adjust1 = r1end - r2->pos; | ||
3052 | } | ||
3053 | else if (newsize > r2->size) | ||
3054 | { | ||
3055 | /* shorten r1 */ | ||
3056 | adjust1 = r1end - r2->pos; | ||
3057 | |||
3058 | XD3_ASSERT (r1->size > adjust1); | ||
3059 | |||
3060 | r1->size -= adjust1; | ||
3061 | |||
3062 | /* don't shorten r2 */ | ||
3063 | adjust1 = 0; | ||
3064 | } | ||
3065 | else | ||
3066 | { | ||
3067 | /* shorten r1 */ | ||
3068 | adjust1 = r1->size - newsize; | ||
3069 | |||
3070 | if (r2->pos > r1end - adjust1) | ||
3071 | { | ||
3072 | adjust1 -= r2->pos - (r1end - adjust1); | ||
3073 | } | ||
3074 | |||
3075 | XD3_ASSERT (r1->size > adjust1); | ||
3076 | |||
3077 | r1->size -= adjust1; | ||
3078 | |||
3079 | /* shorten r2 */ | ||
3080 | XD3_ASSERT (r1->pos + r1->size >= r2->pos); | ||
3081 | |||
3082 | adjust1 = r1->pos + r1->size - r2->pos; | ||
3083 | } | ||
3084 | |||
3085 | /* Fallthrough above if-else, shorten r2 */ | ||
3086 | XD3_ASSERT (r2->size > adjust1); | ||
3087 | |||
3088 | r2->size -= adjust1; | ||
3089 | r2->pos += adjust1; | ||
3090 | r2->addr += adjust1; | ||
3091 | |||
3092 | XD3_ASSERT (r1->size >= MIN_MATCH); | ||
3093 | XD3_ASSERT (r2->size >= MIN_MATCH); | ||
3094 | |||
3095 | r1 = r2; | ||
3096 | } | ||
3097 | } | ||
3098 | |||
3099 | XD3_ASSERT (xd3_iopt_check (stream)); | ||
3100 | |||
3101 | /* If forcing, pick instructions until the list is empty, otherwise | ||
3102 | * this empties 50% of the queue. */ | ||
3103 | for (flushed = 0; ! xd3_rlist_empty (& stream->iopt_used); ) | ||
3104 | { | ||
3105 | xd3_rinst *renc = xd3_rlist_pop_front (& stream->iopt_used); | ||
3106 | if ((ret = xd3_iopt_add_encoding (stream, renc))) | ||
3107 | { | ||
3108 | return ret; | ||
3109 | } | ||
3110 | |||
3111 | if (! force) | ||
3112 | { | ||
3113 | if (++flushed > stream->iopt_size / 2) | ||
3114 | { | ||
3115 | break; | ||
3116 | } | ||
3117 | |||
3118 | /* If there are only two instructions remaining, break, | ||
3119 | * because they were not optimized. This means there were | ||
3120 | * more than 50% eliminated by the loop above. */ | ||
3121 | r1 = xd3_rlist_front (& stream->iopt_used); | ||
3122 | if (xd3_rlist_end(& stream->iopt_used, r1) || | ||
3123 | xd3_rlist_end(& stream->iopt_used, r2 = xd3_rlist_next (r1)) || | ||
3124 | xd3_rlist_end(& stream->iopt_used, r3 = xd3_rlist_next (r2))) | ||
3125 | { | ||
3126 | break; | ||
3127 | } | ||
3128 | } | ||
3129 | } | ||
3130 | |||
3131 | XD3_ASSERT (xd3_iopt_check (stream)); | ||
3132 | |||
3133 | XD3_ASSERT (!force || xd3_rlist_length (& stream->iopt_used) == 0); | ||
3134 | |||
3135 | return 0; | ||
3136 | } | ||
3137 | |||
3138 | static int | ||
3139 | xd3_iopt_get_slot (xd3_stream *stream, xd3_rinst** iptr) | ||
3140 | { | ||
3141 | xd3_rinst *i; | ||
3142 | int ret; | ||
3143 | |||
3144 | if (xd3_rlist_empty (& stream->iopt_free)) | ||
3145 | { | ||
3146 | if (stream->iopt_unlimited) | ||
3147 | { | ||
3148 | usize_t elts = XD3_ALLOCSIZE / sizeof(xd3_rinst); | ||
3149 | |||
3150 | if ((ret = xd3_alloc_iopt (stream, elts))) | ||
3151 | { | ||
3152 | return ret; | ||
3153 | } | ||
3154 | |||
3155 | stream->iopt_size += elts; | ||
3156 | } | ||
3157 | else | ||
3158 | { | ||
3159 | if ((ret = xd3_iopt_flush_instructions (stream, 0))) { return ret; } | ||
3160 | |||
3161 | XD3_ASSERT (! xd3_rlist_empty (& stream->iopt_free)); | ||
3162 | } | ||
3163 | } | ||
3164 | |||
3165 | i = xd3_rlist_pop_back (& stream->iopt_free); | ||
3166 | |||
3167 | xd3_rlist_push_back (& stream->iopt_used, i); | ||
3168 | |||
3169 | (*iptr) = i; | ||
3170 | |||
3171 | ++stream->i_slots_used; | ||
3172 | |||
3173 | return 0; | ||
3174 | } | ||
3175 | |||
3176 | /* A copy is about to be emitted that extends backwards to POS, | ||
3177 | * therefore it may completely cover some existing instructions in the | ||
3178 | * buffer. If an instruction is completely covered by this new match, | ||
3179 | * erase it. If the new instruction is covered by the previous one, | ||
3180 | * return 1 to skip it. */ | ||
3181 | static void | ||
3182 | xd3_iopt_erase (xd3_stream *stream, usize_t pos, usize_t size) | ||
3183 | { | ||
3184 | while (! xd3_rlist_empty (& stream->iopt_used)) | ||
3185 | { | ||
3186 | xd3_rinst *r = xd3_rlist_back (& stream->iopt_used); | ||
3187 | |||
3188 | /* Verify that greedy is working. The previous instruction | ||
3189 | * should end before the new one begins. */ | ||
3190 | XD3_ASSERT ((stream->flags & XD3_BEGREEDY) == 0 || (r->pos + r->size <= pos)); | ||
3191 | /* Verify that min_match is working. The previous instruction | ||
3192 | * should end before the new one ends. */ | ||
3193 | XD3_ASSERT ((stream->flags & XD3_BEGREEDY) != 0 || (r->pos + r->size < pos + size)); | ||
3194 | |||
3195 | /* See if the last instruction starts before the new | ||
3196 | * instruction. If so, there is nothing to erase. */ | ||
3197 | if (r->pos < pos) | ||
3198 | { | ||
3199 | return; | ||
3200 | } | ||
3201 | |||
3202 | /* Otherwise, the new instruction covers the old one, delete it | ||
3203 | and repeat. */ | ||
3204 | xd3_rlist_remove (r); | ||
3205 | xd3_rlist_push_back (& stream->iopt_free, r); | ||
3206 | --stream->i_slots_used; | ||
3207 | } | ||
3208 | } | ||
3209 | |||
3210 | /* This function tells the last matched input position. */ | ||
3211 | static usize_t | ||
3212 | xd3_iopt_last_matched (xd3_stream *stream) | ||
3213 | { | ||
3214 | xd3_rinst *r; | ||
3215 | |||
3216 | if (xd3_rlist_empty (& stream->iopt_used)) | ||
3217 | { | ||
3218 | return 0; | ||
3219 | } | ||
3220 | |||
3221 | r = xd3_rlist_back (& stream->iopt_used); | ||
3222 | |||
3223 | return r->pos + r->size; | ||
3224 | } | ||
3225 | |||
3226 | /********************************************************* | ||
3227 | Emit routines | ||
3228 | ***********************************************************/ | ||
3229 | |||
3230 | static int | ||
3231 | xd3_emit_single (xd3_stream *stream, xd3_rinst *single, usize_t code) | ||
3232 | { | ||
3233 | int has_size = stream->code_table[code].size1 == 0; | ||
3234 | int ret; | ||
3235 | |||
3236 | IF_DEBUG2 (DP(RINT "[emit1] %u %s (%u) code %u\n", | ||
3237 | single->pos, | ||
3238 | xd3_rtype_to_string ((xd3_rtype) single->type, 0), | ||
3239 | single->size, | ||
3240 | code)); | ||
3241 | |||
3242 | if ((ret = xd3_emit_byte (stream, & INST_TAIL (stream), code))) | ||
3243 | { | ||
3244 | return ret; | ||
3245 | } | ||
3246 | |||
3247 | if (has_size) | ||
3248 | { | ||
3249 | if ((ret = xd3_emit_size (stream, & INST_TAIL (stream), single->size))) | ||
3250 | { | ||
3251 | return ret; | ||
3252 | } | ||
3253 | } | ||
3254 | |||
3255 | return 0; | ||
3256 | } | ||
3257 | |||
3258 | static int | ||
3259 | xd3_emit_double (xd3_stream *stream, xd3_rinst *first, | ||
3260 | xd3_rinst *second, usize_t code) | ||
3261 | { | ||
3262 | int ret; | ||
3263 | |||
3264 | /* All double instructions use fixed sizes, so all we need to do is | ||
3265 | * output the instruction code, no sizes. */ | ||
3266 | XD3_ASSERT (stream->code_table[code].size1 != 0 && | ||
3267 | stream->code_table[code].size2 != 0); | ||
3268 | |||
3269 | if ((ret = xd3_emit_byte (stream, & INST_TAIL (stream), code))) | ||
3270 | { | ||
3271 | return ret; | ||
3272 | } | ||
3273 | |||
3274 | IF_DEBUG2 (DP(RINT "[emit2]: %u %s (%u) %s (%u) code %u\n", | ||
3275 | first->pos, | ||
3276 | xd3_rtype_to_string ((xd3_rtype) first->type, 0), | ||
3277 | first->size, | ||
3278 | xd3_rtype_to_string ((xd3_rtype) second->type, 0), | ||
3279 | second->size, | ||
3280 | code)); | ||
3281 | |||
3282 | return 0; | ||
3283 | } | ||
3284 | |||
3285 | /* This enters a potential run instruction into the iopt buffer. The | ||
3286 | * position argument is relative to the target window. */ | ||
3287 | static int | ||
3288 | xd3_emit_run (xd3_stream *stream, usize_t pos, usize_t size, uint8_t *run_c) | ||
3289 | { | ||
3290 | xd3_rinst* ri; | ||
3291 | int ret; | ||
3292 | |||
3293 | if ((ret = xd3_iopt_get_slot (stream, & ri))) { return ret; } | ||
3294 | |||
3295 | ri->type = XD3_RUN; | ||
3296 | ri->xtra = *run_c; | ||
3297 | ri->pos = pos; | ||
3298 | ri->size = size; | ||
3299 | |||
3300 | return 0; | ||
3301 | } | ||
3302 | |||
3303 | /* This enters a potential copy instruction into the iopt buffer. The | ||
3304 | * position argument is relative to the target window.. */ | ||
3305 | int | ||
3306 | xd3_found_match (xd3_stream *stream, usize_t pos, | ||
3307 | usize_t size, xoff_t addr, int is_source) | ||
3308 | { | ||
3309 | xd3_rinst* ri; | ||
3310 | int ret; | ||
3311 | |||
3312 | if ((ret = xd3_iopt_get_slot (stream, & ri))) { return ret; } | ||
3313 | |||
3314 | ri->type = XD3_CPY; | ||
3315 | ri->xtra = is_source; | ||
3316 | ri->pos = pos; | ||
3317 | ri->size = size; | ||
3318 | ri->addr = addr; | ||
3319 | |||
3320 | return 0; | ||
3321 | } | ||
3322 | |||
3323 | static int | ||
3324 | xd3_emit_hdr (xd3_stream *stream) | ||
3325 | { | ||
3326 | int ret; | ||
3327 | int use_secondary = stream->sec_type != NULL; | ||
3328 | int use_adler32 = stream->flags & (XD3_ADLER32 | XD3_ADLER32_RECODE); | ||
3329 | int vcd_source = xd3_encoder_used_source (stream); | ||
3330 | usize_t win_ind = 0; | ||
3331 | usize_t del_ind = 0; | ||
3332 | usize_t enc_len; | ||
3333 | usize_t tgt_len; | ||
3334 | usize_t data_len; | ||
3335 | usize_t inst_len; | ||
3336 | usize_t addr_len; | ||
3337 | |||
3338 | if (stream->current_window == 0) | ||
3339 | { | ||
3340 | usize_t hdr_ind = 0; | ||
3341 | int use_appheader = stream->enc_appheader != NULL; | ||
3342 | int use_gencodetbl = GENERIC_ENCODE_TABLES && | ||
3343 | (stream->code_table_desc != & __rfc3284_code_table_desc); | ||
3344 | |||
3345 | if (use_secondary) { hdr_ind |= VCD_SECONDARY; } | ||
3346 | if (use_gencodetbl) { hdr_ind |= VCD_CODETABLE; } | ||
3347 | if (use_appheader) { hdr_ind |= VCD_APPHEADER; } | ||
3348 | |||
3349 | if ((ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3350 | VCDIFF_MAGIC1)) != 0 || | ||
3351 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3352 | VCDIFF_MAGIC2)) != 0 || | ||
3353 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3354 | VCDIFF_MAGIC3)) != 0 || | ||
3355 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3356 | VCDIFF_VERSION)) != 0 || | ||
3357 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), hdr_ind)) != 0) | ||
3358 | { | ||
3359 | return ret; | ||
3360 | } | ||
3361 | |||
3362 | /* Secondary compressor ID */ | ||
3363 | #if SECONDARY_ANY | ||
3364 | if (use_secondary && | ||
3365 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3366 | stream->sec_type->id))) | ||
3367 | { | ||
3368 | return ret; | ||
3369 | } | ||
3370 | #endif | ||
3371 | |||
3372 | /* Compressed code table */ | ||
3373 | if (use_gencodetbl) | ||
3374 | { | ||
3375 | usize_t code_table_size; | ||
3376 | const uint8_t *code_table_data; | ||
3377 | |||
3378 | if ((ret = stream->comp_table_func (stream, & code_table_data, | ||
3379 | & code_table_size))) | ||
3380 | { | ||
3381 | return ret; | ||
3382 | } | ||
3383 | |||
3384 | if ((ret = xd3_emit_size (stream, & HDR_TAIL (stream), | ||
3385 | code_table_size + 2)) || | ||
3386 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3387 | stream->code_table_desc->near_modes)) || | ||
3388 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), | ||
3389 | stream->code_table_desc->same_modes)) || | ||
3390 | (ret = xd3_emit_bytes (stream, & HDR_TAIL (stream), | ||
3391 | code_table_data, code_table_size))) | ||
3392 | { | ||
3393 | return ret; | ||
3394 | } | ||
3395 | } | ||
3396 | |||
3397 | /* Application header */ | ||
3398 | if (use_appheader) | ||
3399 | { | ||
3400 | if ((ret = xd3_emit_size (stream, & HDR_TAIL (stream), | ||
3401 | stream->enc_appheadsz)) || | ||
3402 | (ret = xd3_emit_bytes (stream, & HDR_TAIL (stream), | ||
3403 | stream->enc_appheader, | ||
3404 | stream->enc_appheadsz))) | ||
3405 | { | ||
3406 | return ret; | ||
3407 | } | ||
3408 | } | ||
3409 | } | ||
3410 | |||
3411 | /* try to compress this window */ | ||
3412 | #if SECONDARY_ANY | ||
3413 | if (use_secondary) | ||
3414 | { | ||
3415 | int data_sec = 0; | ||
3416 | int inst_sec = 0; | ||
3417 | int addr_sec = 0; | ||
3418 | |||
3419 | # define ENCODE_SECONDARY_SECTION(UPPER,LOWER) \ | ||
3420 | ((stream->flags & XD3_SEC_NO ## UPPER) == 0 && \ | ||
3421 | (ret = xd3_encode_secondary (stream, \ | ||
3422 | & UPPER ## _HEAD (stream), \ | ||
3423 | & UPPER ## _TAIL (stream), \ | ||
3424 | & xd3_sec_ ## LOWER (stream), \ | ||
3425 | & stream->sec_ ## LOWER, \ | ||
3426 | & LOWER ## _sec))) | ||
3427 | |||
3428 | if (ENCODE_SECONDARY_SECTION (DATA, data) || | ||
3429 | ENCODE_SECONDARY_SECTION (INST, inst) || | ||
3430 | ENCODE_SECONDARY_SECTION (ADDR, addr)) | ||
3431 | { | ||
3432 | return ret; | ||
3433 | } | ||
3434 | |||
3435 | del_ind |= (data_sec ? VCD_DATACOMP : 0); | ||
3436 | del_ind |= (inst_sec ? VCD_INSTCOMP : 0); | ||
3437 | del_ind |= (addr_sec ? VCD_ADDRCOMP : 0); | ||
3438 | } | ||
3439 | #endif | ||
3440 | |||
3441 | /* if (vcd_target) { win_ind |= VCD_TARGET; } */ | ||
3442 | if (vcd_source) { win_ind |= VCD_SOURCE; } | ||
3443 | if (use_adler32) { win_ind |= VCD_ADLER32; } | ||
3444 | |||
3445 | /* window indicator */ | ||
3446 | if ((ret = xd3_emit_byte (stream, & HDR_TAIL (stream), win_ind))) | ||
3447 | { | ||
3448 | return ret; | ||
3449 | } | ||
3450 | |||
3451 | /* source window */ | ||
3452 | if (vcd_source) | ||
3453 | { | ||
3454 | /* or (vcd_target) { ... } */ | ||
3455 | if ((ret = xd3_emit_size (stream, & HDR_TAIL (stream), | ||
3456 | stream->src->srclen)) || | ||
3457 | (ret = xd3_emit_offset (stream, & HDR_TAIL (stream), | ||
3458 | stream->src->srcbase))) { return ret; } | ||
3459 | } | ||
3460 | |||
3461 | tgt_len = stream->avail_in; | ||
3462 | data_len = xd3_sizeof_output (DATA_HEAD (stream)); | ||
3463 | inst_len = xd3_sizeof_output (INST_HEAD (stream)); | ||
3464 | addr_len = xd3_sizeof_output (ADDR_HEAD (stream)); | ||
3465 | |||
3466 | /* The enc_len field is a redundency for future extensions.*/ | ||
3467 | enc_len = (1 + (xd3_sizeof_size (tgt_len) + | ||
3468 | xd3_sizeof_size (data_len) + | ||
3469 | xd3_sizeof_size (inst_len) + | ||
3470 | xd3_sizeof_size (addr_len)) + | ||
3471 | data_len + | ||
3472 | inst_len + | ||
3473 | addr_len + | ||
3474 | (use_adler32 ? 4 : 0)); | ||
3475 | |||
3476 | if ((ret = xd3_emit_size (stream, & HDR_TAIL (stream), enc_len)) || | ||
3477 | (ret = xd3_emit_size (stream, & HDR_TAIL (stream), tgt_len)) || | ||
3478 | (ret = xd3_emit_byte (stream, & HDR_TAIL (stream), del_ind)) || | ||
3479 | (ret = xd3_emit_size (stream, & HDR_TAIL (stream), data_len)) || | ||
3480 | (ret = xd3_emit_size (stream, & HDR_TAIL (stream), inst_len)) || | ||
3481 | (ret = xd3_emit_size (stream, & HDR_TAIL (stream), addr_len))) | ||
3482 | { | ||
3483 | return ret; | ||
3484 | } | ||
3485 | |||
3486 | if (use_adler32) | ||
3487 | { | ||
3488 | uint8_t send[4]; | ||
3489 | uint32_t a32; | ||
3490 | |||
3491 | if (stream->flags & XD3_ADLER32) | ||
3492 | { | ||
3493 | a32 = adler32 (1L, stream->next_in, stream->avail_in); | ||
3494 | } | ||
3495 | else | ||
3496 | { | ||
3497 | a32 = stream->recode_adler32; | ||
3498 | } | ||
3499 | |||
3500 | /* Four bytes. */ | ||
3501 | send[0] = (uint8_t) (a32 >> 24); | ||
3502 | send[1] = (uint8_t) (a32 >> 16); | ||
3503 | send[2] = (uint8_t) (a32 >> 8); | ||
3504 | send[3] = (uint8_t) (a32 & 0x000000FFU); | ||
3505 | |||
3506 | if ((ret = xd3_emit_bytes (stream, & HDR_TAIL (stream), send, 4))) | ||
3507 | { | ||
3508 | return ret; | ||
3509 | } | ||
3510 | } | ||
3511 | |||
3512 | return 0; | ||
3513 | } | ||
3514 | |||
3515 | /**************************************************************** | ||
3516 | Encode routines | ||
3517 | ****************************************************************/ | ||
3518 | |||
3519 | static int | ||
3520 | xd3_encode_buffer_leftover (xd3_stream *stream) | ||
3521 | { | ||
3522 | usize_t take; | ||
3523 | usize_t room; | ||
3524 | |||
3525 | /* Allocate the buffer. */ | ||
3526 | if (stream->buf_in == NULL && | ||
3527 | (stream->buf_in = (uint8_t*) xd3_alloc (stream, stream->winsize, 1)) == NULL) | ||
3528 | { | ||
3529 | return ENOMEM; | ||
3530 | } | ||
3531 | |||
3532 | IF_DEBUG2 (DP(RINT "[leftover] flush?=%s\n", (stream->flags & XD3_FLUSH) ? "yes" : "no")); | ||
3533 | |||
3534 | /* Take leftover input first. */ | ||
3535 | if (stream->buf_leftover != NULL) | ||
3536 | { | ||
3537 | XD3_ASSERT (stream->buf_avail == 0); | ||
3538 | XD3_ASSERT (stream->buf_leftavail < stream->winsize); | ||
3539 | |||
3540 | IF_DEBUG2 (DP(RINT "[leftover] previous %u avail %u\n", stream->buf_leftavail, stream->avail_in)); | ||
3541 | |||
3542 | memcpy (stream->buf_in, stream->buf_leftover, stream->buf_leftavail); | ||
3543 | |||
3544 | stream->buf_leftover = NULL; | ||
3545 | stream->buf_avail = stream->buf_leftavail; | ||
3546 | } | ||
3547 | |||
3548 | /* Copy into the buffer. */ | ||
3549 | room = stream->winsize - stream->buf_avail; | ||
3550 | take = min (room, stream->avail_in); | ||
3551 | |||
3552 | memcpy (stream->buf_in + stream->buf_avail, stream->next_in, take); | ||
3553 | |||
3554 | stream->buf_avail += take; | ||
3555 | |||
3556 | if (take < stream->avail_in) | ||
3557 | { | ||
3558 | /* Buffer is full */ | ||
3559 | stream->buf_leftover = stream->next_in + take; | ||
3560 | stream->buf_leftavail = stream->avail_in - take; | ||
3561 | } | ||
3562 | else if ((stream->buf_avail < stream->winsize) && !(stream->flags & XD3_FLUSH)) | ||
3563 | { | ||
3564 | /* Buffer has space */ | ||
3565 | IF_DEBUG2 (DP(RINT "[leftover] emptied %u\n", take)); | ||
3566 | return XD3_INPUT; | ||
3567 | } | ||
3568 | |||
3569 | /* Use the buffer: */ | ||
3570 | IF_DEBUG2 (DP(RINT "[leftover] take %u remaining %u\n", take, stream->buf_leftavail)); | ||
3571 | stream->next_in = stream->buf_in; | ||
3572 | stream->avail_in = stream->buf_avail; | ||
3573 | stream->buf_avail = 0; | ||
3574 | |||
3575 | return 0; | ||
3576 | } | ||
3577 | |||
3578 | /* Allocates one block of xd3_rlist elements */ | ||
3579 | static int | ||
3580 | xd3_alloc_iopt (xd3_stream *stream, usize_t elts) | ||
3581 | { | ||
3582 | usize_t i; | ||
3583 | xd3_iopt_buflist* last = | ||
3584 | (xd3_iopt_buflist*) xd3_alloc (stream, sizeof (xd3_iopt_buflist), 1); | ||
3585 | |||
3586 | if (last == NULL || | ||
3587 | (last->buffer = (xd3_rinst*) xd3_alloc (stream, sizeof (xd3_rinst), elts)) == NULL) | ||
3588 | { | ||
3589 | return ENOMEM; | ||
3590 | } | ||
3591 | |||
3592 | last->next = stream->iopt_alloc; | ||
3593 | stream->iopt_alloc = last; | ||
3594 | |||
3595 | for (i = 0; i < elts; i += 1) | ||
3596 | { | ||
3597 | xd3_rlist_push_back (& stream->iopt_free, & last->buffer[i]); | ||
3598 | } | ||
3599 | |||
3600 | return 0; | ||
3601 | } | ||
3602 | |||
3603 | /* This function allocates all memory initially used by the encoder. */ | ||
3604 | static int | ||
3605 | xd3_encode_init (xd3_stream *stream, int full_init) | ||
3606 | { | ||
3607 | int i; | ||
3608 | |||
3609 | if (full_init) | ||
3610 | { | ||
3611 | int large_comp = (stream->src != NULL); | ||
3612 | int small_comp = ! (stream->flags & XD3_NOCOMPRESS); | ||
3613 | |||
3614 | /* Memory allocations for checksum tables are delayed until | ||
3615 | * xd3_string_match_init in the first call to string_match--that way | ||
3616 | * identical or short inputs require no table allocation. */ | ||
3617 | if (large_comp) | ||
3618 | { | ||
3619 | usize_t hash_values = (stream->srcwin_maxsz / | ||
3620 | stream->smatcher.large_step); | ||
3621 | |||
3622 | xd3_size_hashtable (stream, | ||
3623 | hash_values, | ||
3624 | & stream->large_hash); | ||
3625 | } | ||
3626 | |||
3627 | if (small_comp) | ||
3628 | { | ||
3629 | /* TODO: This is under devel: used to have min(sprevsz) here, which sort | ||
3630 | * of makes sense, but observed fast performance w/ larger tables, which | ||
3631 | * also sort of makes sense. @@@ */ | ||
3632 | usize_t hash_values = stream->winsize; | ||
3633 | |||
3634 | xd3_size_hashtable (stream, | ||
3635 | hash_values, | ||
3636 | & stream->small_hash); | ||
3637 | } | ||
3638 | } | ||
3639 | |||
3640 | /* data buffers */ | ||
3641 | for (i = 0; i < ENC_SECTS; i += 1) | ||
3642 | { | ||
3643 | if ((stream->enc_heads[i] = | ||
3644 | stream->enc_tails[i] = | ||
3645 | xd3_alloc_output (stream, NULL)) == NULL) | ||
3646 | { | ||
3647 | return ENOMEM; | ||
3648 | } | ||
3649 | } | ||
3650 | |||
3651 | /* iopt buffer */ | ||
3652 | xd3_rlist_init (& stream->iopt_used); | ||
3653 | xd3_rlist_init (& stream->iopt_free); | ||
3654 | |||
3655 | if (xd3_alloc_iopt (stream, stream->iopt_size) != 0) { goto fail; } | ||
3656 | |||
3657 | XD3_ASSERT (xd3_rlist_length (& stream->iopt_free) == stream->iopt_size); | ||
3658 | XD3_ASSERT (xd3_rlist_length (& stream->iopt_used) == 0); | ||
3659 | |||
3660 | /* address cache, code table */ | ||
3661 | stream->acache.s_near = stream->code_table_desc->near_modes; | ||
3662 | stream->acache.s_same = stream->code_table_desc->same_modes; | ||
3663 | stream->code_table = stream->code_table_func (); | ||
3664 | |||
3665 | return xd3_alloc_cache (stream); | ||
3666 | |||
3667 | fail: | ||
3668 | |||
3669 | return ENOMEM; | ||
3670 | } | ||
3671 | |||
3672 | int | ||
3673 | xd3_encode_init_full (xd3_stream *stream) | ||
3674 | { | ||
3675 | return xd3_encode_init (stream, 1); | ||
3676 | } | ||
3677 | |||
3678 | int | ||
3679 | xd3_encode_init_partial (xd3_stream *stream) | ||
3680 | { | ||
3681 | return xd3_encode_init (stream, 0); | ||
3682 | } | ||
3683 | |||
3684 | /* Called after the ENC_POSTOUT state, this puts the output buffers | ||
3685 | * back into separate lists and re-initializes some variables. (The | ||
3686 | * output lists were spliced together during the ENC_FLUSH state.) */ | ||
3687 | static void | ||
3688 | xd3_encode_reset (xd3_stream *stream) | ||
3689 | { | ||
3690 | int i; | ||
3691 | xd3_output *olist; | ||
3692 | |||
3693 | stream->avail_in = 0; | ||
3694 | stream->small_reset = 1; | ||
3695 | stream->i_slots_used = 0; | ||
3696 | |||
3697 | if (stream->src != NULL) | ||
3698 | { | ||
3699 | stream->src->srcbase = 0; | ||
3700 | stream->src->srclen = 0; | ||
3701 | stream->srcwin_decided = 0; | ||
3702 | stream->srcwin_decided_early = 0; | ||
3703 | stream->match_minaddr = 0; | ||
3704 | stream->match_maxaddr = 0; | ||
3705 | stream->taroff = 0; | ||
3706 | } | ||
3707 | |||
3708 | /* Reset output chains. */ | ||
3709 | olist = stream->enc_heads[0]; | ||
3710 | |||
3711 | for (i = 0; i < ENC_SECTS; i += 1) | ||
3712 | { | ||
3713 | XD3_ASSERT (olist != NULL); | ||
3714 | |||
3715 | stream->enc_heads[i] = olist; | ||
3716 | stream->enc_tails[i] = olist; | ||
3717 | olist = olist->next_page; | ||
3718 | |||
3719 | stream->enc_heads[i]->next = 0; | ||
3720 | stream->enc_heads[i]->next_page = NULL; | ||
3721 | |||
3722 | stream->enc_tails[i]->next_page = NULL; | ||
3723 | stream->enc_tails[i] = stream->enc_heads[i]; | ||
3724 | } | ||
3725 | |||
3726 | xd3_freelist_output (stream, olist); | ||
3727 | } | ||
3728 | |||
3729 | /* The main encoding routine. */ | ||
3730 | int | ||
3731 | xd3_encode_input (xd3_stream *stream) | ||
3732 | { | ||
3733 | int ret, i; | ||
3734 | |||
3735 | if (stream->dec_state != 0) | ||
3736 | { | ||
3737 | stream->msg = "encoder/decoder transition"; | ||
3738 | return XD3_INTERNAL; | ||
3739 | } | ||
3740 | |||
3741 | switch (stream->enc_state) | ||
3742 | { | ||
3743 | case ENC_INIT: | ||
3744 | /* Only reached on first time through: memory setup. */ | ||
3745 | if ((ret = xd3_encode_init_full (stream))) { return ret; } | ||
3746 | |||
3747 | stream->enc_state = ENC_INPUT; | ||
3748 | |||
3749 | case ENC_INPUT: | ||
3750 | |||
3751 | /* If there is no input yet, just return. This checks for | ||
3752 | * next_in == NULL, not avail_in == 0 since zero bytes is a | ||
3753 | * valid input. There is an assertion in xd3_avail_input() that | ||
3754 | * next_in != NULL for this reason. By returning right away we | ||
3755 | * avoid creating an input buffer before the caller has supplied | ||
3756 | * its first data. It is possible for xd3_avail_input to be | ||
3757 | * called both before and after the first call to | ||
3758 | * xd3_encode_input(). */ | ||
3759 | if (stream->next_in == NULL) | ||
3760 | { | ||
3761 | return XD3_INPUT; | ||
3762 | } | ||
3763 | |||
3764 | enc_flush: | ||
3765 | /* See if we should buffer the input: either if there is already | ||
3766 | * a leftover buffer, or if the input is short of winsize | ||
3767 | * without flush. The label at this point is reached by a goto | ||
3768 | * below, when there is leftover input after postout. */ | ||
3769 | if ((stream->buf_leftover != NULL) || | ||
3770 | (stream->buf_avail != 0) || | ||
3771 | (stream->avail_in < stream->winsize && ! (stream->flags & XD3_FLUSH))) | ||
3772 | { | ||
3773 | if ((ret = xd3_encode_buffer_leftover (stream))) { return ret; } | ||
3774 | } | ||
3775 | |||
3776 | /* Initalize the address cache before each window. */ | ||
3777 | xd3_init_cache (& stream->acache); | ||
3778 | |||
3779 | stream->input_position = 0; | ||
3780 | stream->min_match = MIN_MATCH; | ||
3781 | stream->unencoded_offset = 0; | ||
3782 | |||
3783 | stream->enc_state = ENC_SEARCH; | ||
3784 | |||
3785 | IF_DEBUG2 (DP(RINT "[WINSTART:%"Q"u] input bytes %u offset %"Q"u\n", | ||
3786 | stream->current_window, stream->avail_in, | ||
3787 | stream->total_in)); | ||
3788 | return XD3_WINSTART; | ||
3789 | |||
3790 | case ENC_SEARCH: | ||
3791 | IF_DEBUG2 (DP(RINT "[SEARCH] match_state %d avail_in %u %s\n", | ||
3792 | stream->match_state, stream->avail_in, | ||
3793 | stream->src ? "source" : "no source")); | ||
3794 | |||
3795 | /* Reentrant matching. */ | ||
3796 | if (stream->src != NULL) | ||
3797 | { | ||
3798 | switch (stream->match_state) | ||
3799 | { | ||
3800 | case MATCH_TARGET: | ||
3801 | /* Try matching forward at the start of the target. | ||
3802 | * This is entered the first time through, to check for | ||
3803 | * a perfect match, and whenever there is a source match | ||
3804 | * that extends to the end of the previous window. The | ||
3805 | * match_srcpos field is initially zero and later set | ||
3806 | * during xd3_source_extend_match. */ | ||
3807 | |||
3808 | if (stream->avail_in > 0) | ||
3809 | { | ||
3810 | /* This call can't fail because the source window is | ||
3811 | * unrestricted. */ | ||
3812 | ret = xd3_source_match_setup (stream, stream->match_srcpos); | ||
3813 | XD3_ASSERT (ret == 0); | ||
3814 | stream->match_state = MATCH_FORWARD; | ||
3815 | } | ||
3816 | else | ||
3817 | { | ||
3818 | stream->match_state = MATCH_SEARCHING; | ||
3819 | stream->match_fwd = 0; | ||
3820 | } | ||
3821 | XD3_ASSERT (stream->match_fwd == 0); | ||
3822 | |||
3823 | case MATCH_FORWARD: | ||
3824 | case MATCH_BACKWARD: | ||
3825 | if (stream->avail_in != 0) | ||
3826 | { | ||
3827 | if ((ret = xd3_source_extend_match (stream)) != 0) | ||
3828 | { | ||
3829 | return ret; | ||
3830 | } | ||
3831 | |||
3832 | /* The search has to make forward progress here | ||
3833 | * or else it can get stuck in a match-backward | ||
3834 | * (getsrcblk) then match-forward (getsrcblk), | ||
3835 | * find insufficient match length, then repeat | ||
3836 | * exactly the same search. | ||
3837 | */ | ||
3838 | stream->input_position += stream->match_fwd; | ||
3839 | } | ||
3840 | |||
3841 | case MATCH_SEARCHING: | ||
3842 | /* Continue string matching. (It's possible that the | ||
3843 | * initial match continued through the entire input, in | ||
3844 | * which case we're still in MATCH_FORWARD and should | ||
3845 | * remain so for the next input window.) */ | ||
3846 | break; | ||
3847 | } | ||
3848 | } | ||
3849 | |||
3850 | /* String matching... */ | ||
3851 | if (stream->avail_in != 0 && | ||
3852 | (ret = stream->smatcher.string_match (stream))) | ||
3853 | { | ||
3854 | return ret; | ||
3855 | } | ||
3856 | |||
3857 | stream->enc_state = ENC_INSTR; | ||
3858 | |||
3859 | case ENC_INSTR: | ||
3860 | /* Note: Jump here to encode VCDIFF deltas w/o using this | ||
3861 | * string-matching code. Merging code code enters here. */ | ||
3862 | |||
3863 | /* Flush the instrution buffer, then possibly add one more | ||
3864 | * instruction, then emit the header. */ | ||
3865 | if ((ret = xd3_iopt_flush_instructions (stream, 1)) || | ||
3866 | (ret = xd3_iopt_add_finalize (stream))) | ||
3867 | { | ||
3868 | return ret; | ||
3869 | } | ||
3870 | |||
3871 | stream->enc_state = ENC_FLUSH; | ||
3872 | |||
3873 | case ENC_FLUSH: | ||
3874 | /* Note: main_recode_func() bypasses string-matching by setting | ||
3875 | * ENC_FLUSH. */ | ||
3876 | if ((ret = xd3_emit_hdr (stream))) | ||
3877 | { | ||
3878 | return ret; | ||
3879 | } | ||
3880 | |||
3881 | /* Begin output. */ | ||
3882 | stream->enc_current = HDR_HEAD (stream); | ||
3883 | |||
3884 | /* Chain all the outputs together. After doing this, it looks | ||
3885 | * as if there is only one section. The other enc_heads are set | ||
3886 | * to NULL to avoid freeing them more than once. */ | ||
3887 | for (i = 1; i < ENC_SECTS; i += 1) | ||
3888 | { | ||
3889 | stream->enc_tails[i-1]->next_page = stream->enc_heads[i]; | ||
3890 | stream->enc_heads[i] = NULL; | ||
3891 | } | ||
3892 | |||
3893 | enc_output: | ||
3894 | |||
3895 | stream->enc_state = ENC_POSTOUT; | ||
3896 | stream->next_out = stream->enc_current->base; | ||
3897 | stream->avail_out = stream->enc_current->next; | ||
3898 | stream->total_out += (xoff_t) stream->avail_out; | ||
3899 | |||
3900 | /* If there is any output in this buffer, return it, otherwise | ||
3901 | * fall through to handle the next buffer or finish the window | ||
3902 | * after all buffers have been output. */ | ||
3903 | if (stream->avail_out > 0) | ||
3904 | { | ||
3905 | /* This is the only place xd3_encode returns XD3_OUTPUT */ | ||
3906 | return XD3_OUTPUT; | ||
3907 | } | ||
3908 | |||
3909 | case ENC_POSTOUT: | ||
3910 | |||
3911 | if (stream->avail_out != 0) | ||
3912 | { | ||
3913 | stream->msg = "missed call to consume output"; | ||
3914 | return XD3_INTERNAL; | ||
3915 | } | ||
3916 | |||
3917 | /* Continue outputting one buffer at a time, until the next is NULL. */ | ||
3918 | if ((stream->enc_current = stream->enc_current->next_page) != NULL) | ||
3919 | { | ||
3920 | goto enc_output; | ||
3921 | } | ||
3922 | |||
3923 | stream->total_in += (xoff_t) stream->avail_in; | ||
3924 | stream->enc_state = ENC_POSTWIN; | ||
3925 | |||
3926 | IF_DEBUG2 (DP(RINT "[WINFINISH:%"Q"u] in=%"Q"u\n", | ||
3927 | stream->current_window, | ||
3928 | stream->total_in)); | ||
3929 | return XD3_WINFINISH; | ||
3930 | |||
3931 | case ENC_POSTWIN: | ||
3932 | |||
3933 | xd3_encode_reset (stream); | ||
3934 | |||
3935 | stream->current_window += 1; | ||
3936 | stream->enc_state = ENC_INPUT; | ||
3937 | |||
3938 | /* If there is leftover input to flush, repeat. */ | ||
3939 | if (stream->buf_leftover != NULL) | ||
3940 | { | ||
3941 | goto enc_flush; | ||
3942 | } | ||
3943 | |||
3944 | /* Ready for more input. */ | ||
3945 | return XD3_INPUT; | ||
3946 | |||
3947 | default: | ||
3948 | stream->msg = "invalid state"; | ||
3949 | return XD3_INTERNAL; | ||
3950 | } | ||
3951 | } | ||
3952 | #endif /* XD3_ENCODER */ | ||
3953 | |||
3954 | /***************************************************************** | ||
3955 | Client convenience functions | ||
3956 | ******************************************************************/ | ||
3957 | |||
3958 | static int | ||
3959 | xd3_process_stream (int is_encode, | ||
3960 | xd3_stream *stream, | ||
3961 | int (*func) (xd3_stream *), | ||
3962 | int close_stream, | ||
3963 | const uint8_t *input, | ||
3964 | usize_t input_size, | ||
3965 | uint8_t *output, | ||
3966 | usize_t *output_size, | ||
3967 | usize_t output_size_max) | ||
3968 | { | ||
3969 | usize_t ipos = 0; | ||
3970 | usize_t n = min(stream->winsize, input_size); | ||
3971 | |||
3972 | (*output_size) = 0; | ||
3973 | |||
3974 | stream->flags |= XD3_FLUSH; | ||
3975 | |||
3976 | xd3_avail_input (stream, input + ipos, n); | ||
3977 | ipos += n; | ||
3978 | |||
3979 | for (;;) | ||
3980 | { | ||
3981 | int ret; | ||
3982 | switch((ret = func (stream))) | ||
3983 | { | ||
3984 | case XD3_OUTPUT: { /* memcpy below */ break; } | ||
3985 | case XD3_INPUT: { | ||
3986 | n = min(stream->winsize, input_size - ipos); | ||
3987 | if (n == 0) { | ||
3988 | goto done; | ||
3989 | } | ||
3990 | xd3_avail_input (stream, input + ipos, n); | ||
3991 | ipos += n; | ||
3992 | continue; | ||
3993 | } | ||
3994 | case XD3_GOTHEADER: { /* ignore */ continue; } | ||
3995 | case XD3_WINSTART: { /* ignore */ continue; } | ||
3996 | case XD3_WINFINISH: { /* ignore */ continue; } | ||
3997 | case XD3_GETSRCBLK: | ||
3998 | { | ||
3999 | stream->msg = "stream requires source input"; | ||
4000 | return XD3_INTERNAL; | ||
4001 | } | ||
4002 | case 0: | ||
4003 | { | ||
4004 | /* xd3_encode_input/xd3_decode_input never return 0 */ | ||
4005 | stream->msg = "invalid return: 0"; | ||
4006 | return XD3_INTERNAL; | ||
4007 | } | ||
4008 | default: | ||
4009 | return ret; | ||
4010 | } | ||
4011 | |||
4012 | if (*output_size + stream->avail_out > output_size_max) | ||
4013 | { | ||
4014 | stream->msg = "insufficient output space"; | ||
4015 | return ENOSPC; | ||
4016 | } | ||
4017 | |||
4018 | memcpy (output + *output_size, stream->next_out, stream->avail_out); | ||
4019 | |||
4020 | *output_size += stream->avail_out; | ||
4021 | |||
4022 | xd3_consume_output (stream); | ||
4023 | } | ||
4024 | done: | ||
4025 | return (close_stream == 0) ? 0 : xd3_close_stream (stream); | ||
4026 | } | ||
4027 | |||
4028 | static int | ||
4029 | xd3_process_memory (int is_encode, | ||
4030 | int (*func) (xd3_stream *), | ||
4031 | int close_stream, | ||
4032 | const uint8_t *input, | ||
4033 | usize_t input_size, | ||
4034 | const uint8_t *source, | ||
4035 | usize_t source_size, | ||
4036 | uint8_t *output, | ||
4037 | usize_t *output_size, | ||
4038 | usize_t output_size_max, | ||
4039 | int flags) { | ||
4040 | xd3_stream stream; | ||
4041 | xd3_config config; | ||
4042 | xd3_source src; | ||
4043 | int ret; | ||
4044 | |||
4045 | memset (& stream, 0, sizeof (stream)); | ||
4046 | memset (& config, 0, sizeof (config)); | ||
4047 | |||
4048 | if (input == NULL || output == NULL) { | ||
4049 | stream.msg = "invalid input/output buffer"; | ||
4050 | ret = XD3_INTERNAL; | ||
4051 | goto exit; | ||
4052 | } | ||
4053 | |||
4054 | config.flags = flags; | ||
4055 | |||
4056 | if (is_encode) | ||
4057 | { | ||
4058 | config.srcwin_maxsz = source_size; | ||
4059 | config.winsize = min(input_size, (usize_t) XD3_DEFAULT_WINSIZE); | ||
4060 | config.iopt_size = min(input_size / 32, XD3_DEFAULT_IOPT_SIZE); | ||
4061 | config.iopt_size = max(config.iopt_size, 128U); | ||
4062 | config.sprevsz = xd3_pow2_roundup (config.winsize); | ||
4063 | } | ||
4064 | |||
4065 | if ((ret = xd3_config_stream (&stream, &config)) != 0) | ||
4066 | { | ||
4067 | goto exit; | ||
4068 | } | ||
4069 | |||
4070 | if (source != NULL) | ||
4071 | { | ||
4072 | memset (& src, 0, sizeof (src)); | ||
4073 | |||
4074 | src.blksize = source_size; | ||
4075 | src.onblk = source_size; | ||
4076 | src.curblk = source; | ||
4077 | src.curblkno = 0; | ||
4078 | |||
4079 | if ((ret = xd3_set_source_and_size (&stream, &src, source_size)) != 0) | ||
4080 | { | ||
4081 | goto exit; | ||
4082 | } | ||
4083 | } | ||
4084 | |||
4085 | if ((ret = xd3_process_stream (is_encode, | ||
4086 | & stream, | ||
4087 | func, 1, | ||
4088 | input, input_size, | ||
4089 | output, | ||
4090 | output_size, | ||
4091 | output_size_max)) != 0) | ||
4092 | { | ||
4093 | goto exit; | ||
4094 | } | ||
4095 | |||
4096 | exit: | ||
4097 | if (ret != 0) | ||
4098 | { | ||
4099 | IF_DEBUG2 (DP(RINT "process_memory: %d: %s\n", ret, stream.msg)); | ||
4100 | } | ||
4101 | xd3_free_stream(&stream); | ||
4102 | return ret; | ||
4103 | } | ||
4104 | |||
4105 | int | ||
4106 | xd3_decode_stream (xd3_stream *stream, | ||
4107 | const uint8_t *input, | ||
4108 | usize_t input_size, | ||
4109 | uint8_t *output, | ||
4110 | usize_t *output_size, | ||
4111 | usize_t output_size_max) | ||
4112 | { | ||
4113 | return xd3_process_stream (0, stream, & xd3_decode_input, 1, | ||
4114 | input, input_size, | ||
4115 | output, output_size, output_size_max); | ||
4116 | } | ||
4117 | |||
4118 | int | ||
4119 | xd3_decode_memory (const uint8_t *input, | ||
4120 | usize_t input_size, | ||
4121 | const uint8_t *source, | ||
4122 | usize_t source_size, | ||
4123 | uint8_t *output, | ||
4124 | usize_t *output_size, | ||
4125 | usize_t output_size_max, | ||
4126 | int flags) { | ||
4127 | return xd3_process_memory (0, & xd3_decode_input, 1, | ||
4128 | input, input_size, | ||
4129 | source, source_size, | ||
4130 | output, output_size, output_size_max, | ||
4131 | flags); | ||
4132 | } | ||
4133 | |||
4134 | |||
4135 | #if XD3_ENCODER | ||
4136 | int | ||
4137 | xd3_encode_stream (xd3_stream *stream, | ||
4138 | const uint8_t *input, | ||
4139 | usize_t input_size, | ||
4140 | uint8_t *output, | ||
4141 | usize_t *output_size, | ||
4142 | usize_t output_size_max) | ||
4143 | { | ||
4144 | return xd3_process_stream (1, stream, & xd3_encode_input, 1, | ||
4145 | input, input_size, | ||
4146 | output, output_size, output_size_max); | ||
4147 | } | ||
4148 | |||
4149 | int | ||
4150 | xd3_encode_memory (const uint8_t *input, | ||
4151 | usize_t input_size, | ||
4152 | const uint8_t *source, | ||
4153 | usize_t source_size, | ||
4154 | uint8_t *output, | ||
4155 | usize_t *output_size, | ||
4156 | usize_t output_size_max, | ||
4157 | int flags) { | ||
4158 | return xd3_process_memory (1, & xd3_encode_input, 1, | ||
4159 | input, input_size, | ||
4160 | source, source_size, | ||
4161 | output, output_size, output_size_max, | ||
4162 | flags); | ||
4163 | } | ||
4164 | #endif | ||
4165 | |||
4166 | |||
4167 | /************************************************************* | ||
4168 | String matching helpers | ||
4169 | *************************************************************/ | ||
4170 | |||
4171 | #if XD3_ENCODER | ||
4172 | /* Do the initial xd3_string_match() checksum table setup. | ||
4173 | * Allocations are delayed until first use to avoid allocation | ||
4174 | * sometimes (e.g., perfect matches, zero-length inputs). */ | ||
4175 | static int | ||
4176 | xd3_string_match_init (xd3_stream *stream) | ||
4177 | { | ||
4178 | const int DO_SMALL = ! (stream->flags & XD3_NOCOMPRESS); | ||
4179 | const int DO_LARGE = (stream->src != NULL); | ||
4180 | |||
4181 | if (DO_LARGE && stream->large_table == NULL) | ||
4182 | { | ||
4183 | if ((stream->large_table = | ||
4184 | (usize_t*) xd3_alloc0 (stream, stream->large_hash.size, sizeof (usize_t))) == NULL) | ||
4185 | { | ||
4186 | return ENOMEM; | ||
4187 | } | ||
4188 | } | ||
4189 | |||
4190 | if (DO_SMALL) | ||
4191 | { | ||
4192 | /* Subsequent calls can return immediately after checking reset. */ | ||
4193 | if (stream->small_table != NULL) | ||
4194 | { | ||
4195 | /* The target hash table is reinitialized once per window. */ | ||
4196 | /* TODO: This would not have to be reinitialized if absolute | ||
4197 | * offsets were being stored. */ | ||
4198 | if (stream->small_reset) | ||
4199 | { | ||
4200 | stream->small_reset = 0; | ||
4201 | memset (stream->small_table, 0, | ||
4202 | sizeof (usize_t) * stream->small_hash.size); | ||
4203 | } | ||
4204 | |||
4205 | return 0; | ||
4206 | } | ||
4207 | |||
4208 | if ((stream->small_table = | ||
4209 | (usize_t*) xd3_alloc0 (stream, | ||
4210 | stream->small_hash.size, | ||
4211 | sizeof (usize_t))) == NULL) | ||
4212 | { | ||
4213 | return ENOMEM; | ||
4214 | } | ||
4215 | |||
4216 | /* If there is a previous table needed. */ | ||
4217 | if (stream->smatcher.small_lchain > 1 || | ||
4218 | stream->smatcher.small_chain > 1) | ||
4219 | { | ||
4220 | if ((stream->small_prev = | ||
4221 | (xd3_slist*) xd3_alloc (stream, | ||
4222 | stream->sprevsz, | ||
4223 | sizeof (xd3_slist))) == NULL) | ||
4224 | { | ||
4225 | return ENOMEM; | ||
4226 | } | ||
4227 | } | ||
4228 | } | ||
4229 | |||
4230 | return 0; | ||
4231 | } | ||
4232 | |||
4233 | #if XD3_USE_LARGEFILE64 | ||
4234 | /* This function handles the 32/64bit ambiguity -- file positions are 64bit | ||
4235 | * but the hash table for source-offsets is 32bit. */ | ||
4236 | static xoff_t | ||
4237 | xd3_source_cksum_offset(xd3_stream *stream, usize_t low) | ||
4238 | { | ||
4239 | xoff_t scp = stream->srcwin_cksum_pos; | ||
4240 | xoff_t s0 = scp >> 32; | ||
4241 | |||
4242 | usize_t sr = (usize_t) scp; | ||
4243 | |||
4244 | if (s0 == 0) { | ||
4245 | return low; | ||
4246 | } | ||
4247 | |||
4248 | /* This should not be >= because srcwin_cksum_pos is the next | ||
4249 | * position to index. */ | ||
4250 | if (low > sr) { | ||
4251 | return (--s0 << 32) | low; | ||
4252 | } | ||
4253 | |||
4254 | return (s0 << 32) | low; | ||
4255 | } | ||
4256 | #else | ||
4257 | static xoff_t | ||
4258 | xd3_source_cksum_offset(xd3_stream *stream, usize_t low) | ||
4259 | { | ||
4260 | return (xoff_t) low; | ||
4261 | } | ||
4262 | #endif | ||
4263 | |||
4264 | /* This function sets up the stream->src fields srcbase, srclen. The | ||
4265 | * call is delayed until these values are needed to encode a copy | ||
4266 | * address. At this point the decision has to be made. */ | ||
4267 | static int | ||
4268 | xd3_srcwin_setup (xd3_stream *stream) | ||
4269 | { | ||
4270 | xd3_source *src = stream->src; | ||
4271 | xoff_t length, x; | ||
4272 | |||
4273 | /* Check the undecided state. */ | ||
4274 | XD3_ASSERT (src->srclen == 0 && src->srcbase == 0); | ||
4275 | |||
4276 | /* Avoid repeating this call. */ | ||
4277 | stream->srcwin_decided = 1; | ||
4278 | |||
4279 | /* If the stream is flushing, then the iopt buffer was able to | ||
4280 | * contain the complete encoding. If no copies were issued no | ||
4281 | * source window is actually needed. This prevents the VCDIFF | ||
4282 | * header from including source base/len. xd3_emit_hdr checks for | ||
4283 | * srclen == 0. */ | ||
4284 | if (stream->enc_state == ENC_INSTR && stream->match_maxaddr == 0) | ||
4285 | { | ||
4286 | goto done; | ||
4287 | } | ||
4288 | |||
4289 | /* Check for overflow, srclen is usize_t - this can't happen unless | ||
4290 | * XD3_DEFAULT_SRCBACK and related parameters are extreme - should | ||
4291 | * use smaller windows. */ | ||
4292 | length = stream->match_maxaddr - stream->match_minaddr; | ||
4293 | |||
4294 | x = (xoff_t) USIZE_T_MAX; | ||
4295 | if (length > x) | ||
4296 | { | ||
4297 | stream->msg = "source window length overflow (not 64bit)"; | ||
4298 | return XD3_INTERNAL; | ||
4299 | } | ||
4300 | |||
4301 | /* If ENC_INSTR, then we know the exact source window to use because | ||
4302 | * no more copies can be issued. */ | ||
4303 | if (stream->enc_state == ENC_INSTR) | ||
4304 | { | ||
4305 | src->srcbase = stream->match_minaddr; | ||
4306 | src->srclen = (usize_t) length; | ||
4307 | XD3_ASSERT (src->srclen); | ||
4308 | goto done; | ||
4309 | } | ||
4310 | |||
4311 | /* Otherwise, we have to make a guess. More copies may still be | ||
4312 | * issued, but we have to decide the source window base and length | ||
4313 | * now. */ | ||
4314 | src->srcbase = stream->match_minaddr; | ||
4315 | src->srclen = max ((usize_t) length, | ||
4316 | stream->avail_in + (stream->avail_in >> 2)); | ||
4317 | |||
4318 | /* OPT: If we know the source size, it might be possible to reduce | ||
4319 | * srclen. */ | ||
4320 | XD3_ASSERT (src->srclen); | ||
4321 | done: | ||
4322 | /* Set the taroff. This convenience variable is used even when | ||
4323 | stream->src == NULL. */ | ||
4324 | stream->taroff = src->srclen; | ||
4325 | return 0; | ||
4326 | } | ||
4327 | |||
4328 | /* Sets the bounding region for a newly discovered source match, prior | ||
4329 | * to calling xd3_source_extend_match(). This sets the match_maxfwd, | ||
4330 | * match_maxback variables. Note: srcpos is an absolute position | ||
4331 | * (xoff_t) but the match_maxfwd, match_maxback variables are usize_t. | ||
4332 | * Returns 0 if the setup succeeds, or 1 if the source position lies | ||
4333 | * outside an already-decided srcbase/srclen window. */ | ||
4334 | static int | ||
4335 | xd3_source_match_setup (xd3_stream *stream, xoff_t srcpos) | ||
4336 | { | ||
4337 | xd3_source *src = stream->src; | ||
4338 | usize_t greedy_or_not; | ||
4339 | xoff_t frontier_pos; | ||
4340 | |||
4341 | stream->match_maxback = 0; | ||
4342 | stream->match_maxfwd = 0; | ||
4343 | stream->match_back = 0; | ||
4344 | stream->match_fwd = 0; | ||
4345 | |||
4346 | /* This avoids a non-blocking endless loop caused by scanning | ||
4347 | * backwards across a block boundary, only to find not enough | ||
4348 | * matching bytes to beat the current min_match due to a better lazy | ||
4349 | * target match: the re-entry to xd3_string_match() repeats the same | ||
4350 | * long match because the input position hasn't changed. TODO: if | ||
4351 | * ever duplicates are added to the source hash table, this logic | ||
4352 | * won't suffice to avoid loops. See testing/regtest.cc's | ||
4353 | * TestNonBlockingProgress test! */ | ||
4354 | if (srcpos != 0 && srcpos == stream->match_last_srcpos) | ||
4355 | { | ||
4356 | IF_DEBUG2(DP(RINT "[match_setup] looping failure\n")); | ||
4357 | goto bad; | ||
4358 | } | ||
4359 | |||
4360 | /* Implement srcwin_maxsz, which prevents the encoder from seeking | ||
4361 | * back further than the LRU cache maintaining FIFO discipline, (to | ||
4362 | * avoid seeking). */ | ||
4363 | frontier_pos = | ||
4364 | stream->src->frontier_blkno * stream->src->blksize; | ||
4365 | IF_DEBUG1(DP(RINT "[match_setup] frontier_pos %"Q"u, srcpos %"Q"u, " | ||
4366 | "srcwin_maxsz %u\n", | ||
4367 | frontier_pos, srcpos, stream->srcwin_maxsz)); | ||
4368 | if (srcpos < frontier_pos && | ||
4369 | frontier_pos - srcpos > stream->srcwin_maxsz) { | ||
4370 | IF_DEBUG1(DP(RINT "[match_setup] rejected due to srcwin_maxsz " | ||
4371 | "distance eof=%"Q"u srcpos=%"Q"u maxsz=%u\n", | ||
4372 | xd3_source_eof (stream->src), | ||
4373 | srcpos, stream->srcwin_maxsz)); | ||
4374 | goto bad; | ||
4375 | } | ||
4376 | |||
4377 | /* Going backwards, the 1.5-pass algorithm allows some | ||
4378 | * already-matched input may be covered by a longer source match. | ||
4379 | * The greedy algorithm does not allow this. */ | ||
4380 | if (stream->flags & XD3_BEGREEDY) | ||
4381 | { | ||
4382 | /* The greedy algorithm allows backward matching to the last | ||
4383 | matched position. */ | ||
4384 | greedy_or_not = xd3_iopt_last_matched (stream); | ||
4385 | } | ||
4386 | else | ||
4387 | { | ||
4388 | /* The 1.5-pass algorithm allows backward matching to go back as | ||
4389 | * far as the unencoded offset, which is updated as instructions | ||
4390 | * pass out of the iopt buffer. If this (default) is chosen, it | ||
4391 | * means xd3_iopt_erase may be called to eliminate instructions | ||
4392 | * when a covering source match is found. */ | ||
4393 | greedy_or_not = stream->unencoded_offset; | ||
4394 | } | ||
4395 | |||
4396 | /* Backward target match limit. */ | ||
4397 | XD3_ASSERT (stream->input_position >= greedy_or_not); | ||
4398 | stream->match_maxback = stream->input_position - greedy_or_not; | ||
4399 | |||
4400 | /* Forward target match limit. */ | ||
4401 | XD3_ASSERT (stream->avail_in > stream->input_position); | ||
4402 | stream->match_maxfwd = stream->avail_in - stream->input_position; | ||
4403 | |||
4404 | /* Now we take the source position into account. It depends whether | ||
4405 | * the srclen/srcbase have been decided yet. */ | ||
4406 | if (stream->srcwin_decided == 0) | ||
4407 | { | ||
4408 | /* Unrestricted case: the match can cover the entire source, | ||
4409 | * 0--src->size. We compare the usize_t | ||
4410 | * match_maxfwd/match_maxback against the xoff_t | ||
4411 | * src->size/srcpos values and take the min. */ | ||
4412 | if (srcpos < (xoff_t) stream->match_maxback) | ||
4413 | { | ||
4414 | stream->match_maxback = (usize_t) srcpos; | ||
4415 | } | ||
4416 | |||
4417 | if (stream->src->eof_known) | ||
4418 | { | ||
4419 | xoff_t srcavail = xd3_source_eof (stream->src) - srcpos; | ||
4420 | |||
4421 | if (srcavail < (xoff_t) stream->match_maxfwd) | ||
4422 | { | ||
4423 | stream->match_maxfwd = (usize_t) srcavail; | ||
4424 | } | ||
4425 | } | ||
4426 | |||
4427 | IF_DEBUG1(DP(RINT | ||
4428 | "[match_setup] srcpos %"Q"u (tgtpos %"Q"u) " | ||
4429 | "unrestricted maxback %u maxfwd %u\n", | ||
4430 | srcpos, | ||
4431 | stream->total_in + stream->input_position, | ||
4432 | stream->match_maxback, | ||
4433 | stream->match_maxfwd)); | ||
4434 | goto good; | ||
4435 | } | ||
4436 | |||
4437 | /* Decided some source window. */ | ||
4438 | XD3_ASSERT (src->srclen > 0); | ||
4439 | |||
4440 | /* Restricted case: fail if the srcpos lies outside the source window */ | ||
4441 | if ((srcpos < src->srcbase) || | ||
4442 | (srcpos > (src->srcbase + (xoff_t) src->srclen))) | ||
4443 | { | ||
4444 | IF_DEBUG1(DP(RINT "[match_setup] restricted source window failure\n")); | ||
4445 | goto bad; | ||
4446 | } | ||
4447 | else | ||
4448 | { | ||
4449 | usize_t srcavail; | ||
4450 | |||
4451 | srcavail = (usize_t) (srcpos - src->srcbase); | ||
4452 | if (srcavail < stream->match_maxback) | ||
4453 | { | ||
4454 | stream->match_maxback = srcavail; | ||
4455 | } | ||
4456 | |||
4457 | srcavail = (usize_t) (src->srcbase + (xoff_t) src->srclen - srcpos); | ||
4458 | if (srcavail < stream->match_maxfwd) | ||
4459 | { | ||
4460 | stream->match_maxfwd = srcavail; | ||
4461 | } | ||
4462 | |||
4463 | IF_DEBUG1(DP(RINT | ||
4464 | "[match_setup] srcpos %"Q"u (tgtpos %"Q"u) " | ||
4465 | "restricted maxback %u maxfwd %u\n", | ||
4466 | srcpos, | ||
4467 | stream->total_in + stream->input_position, | ||
4468 | stream->match_maxback, | ||
4469 | stream->match_maxfwd)); | ||
4470 | goto good; | ||
4471 | } | ||
4472 | |||
4473 | good: | ||
4474 | stream->match_state = MATCH_BACKWARD; | ||
4475 | stream->match_srcpos = srcpos; | ||
4476 | stream->match_last_srcpos = srcpos; | ||
4477 | return 0; | ||
4478 | |||
4479 | bad: | ||
4480 | stream->match_state = MATCH_SEARCHING; | ||
4481 | return 1; | ||
4482 | } | ||
4483 | |||
4484 | static inline int | ||
4485 | xd3_forward_match(const uint8_t *s1c, const uint8_t *s2c, int n) | ||
4486 | { | ||
4487 | int i = 0; | ||
4488 | #if UNALIGNED_OK | ||
4489 | int nint = n / sizeof(int); | ||
4490 | |||
4491 | if (nint >> 3) | ||
4492 | { | ||
4493 | int j = 0; | ||
4494 | const int *s1 = (const int*)s1c; | ||
4495 | const int *s2 = (const int*)s2c; | ||
4496 | int nint_8 = nint - 8; | ||
4497 | |||
4498 | while (i <= nint_8 && | ||
4499 | s1[i++] == s2[j++] && | ||
4500 | s1[i++] == s2[j++] && | ||
4501 | s1[i++] == s2[j++] && | ||
4502 | s1[i++] == s2[j++] && | ||
4503 | s1[i++] == s2[j++] && | ||
4504 | s1[i++] == s2[j++] && | ||
4505 | s1[i++] == s2[j++] && | ||
4506 | s1[i++] == s2[j++]) { } | ||
4507 | |||
4508 | i = (i - 1) * sizeof(int); | ||
4509 | } | ||
4510 | #endif | ||
4511 | |||
4512 | while (i < n && s1c[i] == s2c[i]) | ||
4513 | { | ||
4514 | i++; | ||
4515 | } | ||
4516 | return i; | ||
4517 | } | ||
4518 | |||
4519 | /* This function expands the source match backward and forward. It is | ||
4520 | * reentrant, since xd3_getblk may return XD3_GETSRCBLK, so most | ||
4521 | * variables are kept in xd3_stream. There are two callers of this | ||
4522 | * function, the string_matching routine when a checksum match is | ||
4523 | * discovered, and xd3_encode_input whenever a continuing (or initial) | ||
4524 | * match is suspected. The two callers do different things with the | ||
4525 | * input_position, thus this function leaves that variable untouched. | ||
4526 | * If a match is taken the resulting stream->match_fwd is left | ||
4527 | * non-zero. */ | ||
4528 | static int | ||
4529 | xd3_source_extend_match (xd3_stream *stream) | ||
4530 | { | ||
4531 | int ret; | ||
4532 | xd3_source *src = stream->src; | ||
4533 | xoff_t matchoff; /* matchoff is the current right/left-boundary of | ||
4534 | the source match being tested. */ | ||
4535 | usize_t streamoff; /* streamoff is the current right/left-boundary | ||
4536 | of the input match being tested. */ | ||
4537 | xoff_t tryblk; /* tryblk, tryoff are the block, offset position | ||
4538 | of matchoff */ | ||
4539 | usize_t tryoff; | ||
4540 | usize_t tryrem; /* tryrem is the number of matchable bytes */ | ||
4541 | usize_t matched; | ||
4542 | |||
4543 | IF_DEBUG2(DP(RINT "[extend match] srcpos %"Q"u\n", | ||
4544 | stream->match_srcpos)); | ||
4545 | |||
4546 | XD3_ASSERT (src != NULL); | ||
4547 | |||
4548 | /* Does it make sense to compute backward match AFTER forward match? */ | ||
4549 | if (stream->match_state == MATCH_BACKWARD) | ||
4550 | { | ||
4551 | /* Note: this code is practically duplicated below, substituting | ||
4552 | * match_fwd/match_back and direction. TODO: Consolidate? */ | ||
4553 | matchoff = stream->match_srcpos - stream->match_back; | ||
4554 | streamoff = stream->input_position - stream->match_back; | ||
4555 | xd3_blksize_div (matchoff, src, &tryblk, &tryoff); | ||
4556 | |||
4557 | /* this loops backward over source blocks */ | ||
4558 | while (stream->match_back < stream->match_maxback) | ||
4559 | { | ||
4560 | /* see if we're backing across a source block boundary */ | ||
4561 | if (tryoff == 0) | ||
4562 | { | ||
4563 | tryoff = src->blksize; | ||
4564 | tryblk -= 1; | ||
4565 | } | ||
4566 | |||
4567 | if ((ret = xd3_getblk (stream, tryblk))) | ||
4568 | { | ||
4569 | /* if search went too far back, continue forward. */ | ||
4570 | if (ret == XD3_TOOFARBACK) | ||
4571 | { | ||
4572 | break; | ||
4573 | } | ||
4574 | |||
4575 | /* could be a XD3_GETSRCBLK failure. */ | ||
4576 | return ret; | ||
4577 | } | ||
4578 | |||
4579 | tryrem = min (tryoff, stream->match_maxback - stream->match_back); | ||
4580 | |||
4581 | IF_DEBUG2(DP(RINT "[maxback] maxback %u trysrc %"Q"u/%u tgt %u tryrem %u\n", | ||
4582 | stream->match_maxback, tryblk, tryoff, streamoff, tryrem)); | ||
4583 | |||
4584 | /* TODO: This code can be optimized similar to xd3_match_forward() */ | ||
4585 | for (; tryrem != 0; tryrem -= 1, stream->match_back += 1) | ||
4586 | { | ||
4587 | if (src->curblk[tryoff-1] != stream->next_in[streamoff-1]) | ||
4588 | { | ||
4589 | goto doneback; | ||
4590 | } | ||
4591 | |||
4592 | tryoff -= 1; | ||
4593 | streamoff -= 1; | ||
4594 | } | ||
4595 | } | ||
4596 | |||
4597 | doneback: | ||
4598 | stream->match_state = MATCH_FORWARD; | ||
4599 | } | ||
4600 | |||
4601 | XD3_ASSERT (stream->match_state == MATCH_FORWARD); | ||
4602 | |||
4603 | matchoff = stream->match_srcpos + stream->match_fwd; | ||
4604 | streamoff = stream->input_position + stream->match_fwd; | ||
4605 | xd3_blksize_div (matchoff, src, & tryblk, & tryoff); | ||
4606 | |||
4607 | /* Note: practically the same code as backwards case above: same comments */ | ||
4608 | while (stream->match_fwd < stream->match_maxfwd) | ||
4609 | { | ||
4610 | if (tryoff == src->blksize) | ||
4611 | { | ||
4612 | tryoff = 0; | ||
4613 | tryblk += 1; | ||
4614 | } | ||
4615 | |||
4616 | if ((ret = xd3_getblk (stream, tryblk))) | ||
4617 | { | ||
4618 | /* if search went too far back, continue forward. */ | ||
4619 | if (ret == XD3_TOOFARBACK) | ||
4620 | { | ||
4621 | break; | ||
4622 | } | ||
4623 | |||
4624 | /* could be a XD3_GETSRCBLK failure. */ | ||
4625 | return ret; | ||
4626 | } | ||
4627 | |||
4628 | tryrem = min(stream->match_maxfwd - stream->match_fwd, | ||
4629 | src->onblk - tryoff); | ||
4630 | |||
4631 | if (tryrem == 0) | ||
4632 | { | ||
4633 | /* Generally, this means we have a power-of-two size source | ||
4634 | * and we just found the end-of-file, in this case it's an | ||
4635 | * empty block. */ | ||
4636 | XD3_ASSERT (src->onblk < src->blksize); | ||
4637 | break; | ||
4638 | } | ||
4639 | |||
4640 | matched = xd3_forward_match(src->curblk + tryoff, | ||
4641 | stream->next_in + streamoff, | ||
4642 | tryrem); | ||
4643 | tryoff += matched; | ||
4644 | streamoff += matched; | ||
4645 | stream->match_fwd += matched; | ||
4646 | |||
4647 | if (tryrem != matched) | ||
4648 | { | ||
4649 | break; | ||
4650 | } | ||
4651 | } | ||
4652 | |||
4653 | stream->match_state = MATCH_SEARCHING; | ||
4654 | |||
4655 | /* If the match ends short of the last instruction end, we probably | ||
4656 | * don't want it. There is the possibility that a copy ends short | ||
4657 | * of the last copy but also goes further back, in which case we | ||
4658 | * might want it. This code does not implement such: if so we would | ||
4659 | * need more complicated xd3_iopt_erase logic. */ | ||
4660 | if (stream->match_fwd < stream->min_match) | ||
4661 | { | ||
4662 | stream->match_fwd = 0; | ||
4663 | } | ||
4664 | else | ||
4665 | { | ||
4666 | usize_t total = stream->match_fwd + stream->match_back; | ||
4667 | |||
4668 | /* Correct the variables to remove match_back from the equation. */ | ||
4669 | usize_t target_position = stream->input_position - stream->match_back; | ||
4670 | usize_t match_length = stream->match_back + stream->match_fwd; | ||
4671 | xoff_t match_position = stream->match_srcpos - stream->match_back; | ||
4672 | xoff_t match_end = stream->match_srcpos + stream->match_fwd; | ||
4673 | |||
4674 | /* At this point we may have to erase any iopt-buffer | ||
4675 | * instructions that are fully covered by a backward-extending | ||
4676 | * copy. */ | ||
4677 | if (stream->match_back > 0) | ||
4678 | { | ||
4679 | xd3_iopt_erase (stream, target_position, total); | ||
4680 | } | ||
4681 | |||
4682 | stream->match_back = 0; | ||
4683 | |||
4684 | /* Update ranges. The first source match occurs with both | ||
4685 | values set to 0. */ | ||
4686 | if (stream->match_maxaddr == 0 || | ||
4687 | match_position < stream->match_minaddr) | ||
4688 | { | ||
4689 | stream->match_minaddr = match_position; | ||
4690 | } | ||
4691 | |||
4692 | if (match_end > stream->match_maxaddr) | ||
4693 | { | ||
4694 | /* Note: per-window */ | ||
4695 | stream->match_maxaddr = match_end; | ||
4696 | } | ||
4697 | |||
4698 | if (match_end > stream->maxsrcaddr) | ||
4699 | { | ||
4700 | /* Note: across windows */ | ||
4701 | stream->maxsrcaddr = match_end; | ||
4702 | } | ||
4703 | |||
4704 | IF_DEBUG1 ({ | ||
4705 | static int x = 0; | ||
4706 | DP(RINT "[source match:%d] <inp %"Q"u %"Q"u> <src %"Q"u %"Q"u> (%s) [ %u bytes ]\n", | ||
4707 | x++, | ||
4708 | stream->total_in + target_position, | ||
4709 | stream->total_in + target_position + match_length, | ||
4710 | match_position, | ||
4711 | match_position + match_length, | ||
4712 | (stream->total_in + target_position == match_position) ? "same" : "diff", | ||
4713 | match_length); | ||
4714 | }); | ||
4715 | |||
4716 | if ((ret = xd3_found_match (stream, | ||
4717 | /* decoder position */ target_position, | ||
4718 | /* length */ match_length, | ||
4719 | /* address */ match_position, | ||
4720 | /* is_source */ 1))) | ||
4721 | { | ||
4722 | return ret; | ||
4723 | } | ||
4724 | |||
4725 | /* If the match ends with the available input: */ | ||
4726 | if (target_position + match_length == stream->avail_in) | ||
4727 | { | ||
4728 | /* Setup continuing match for the next window. */ | ||
4729 | stream->match_state = MATCH_TARGET; | ||
4730 | stream->match_srcpos = match_end; | ||
4731 | } | ||
4732 | } | ||
4733 | |||
4734 | return 0; | ||
4735 | } | ||
4736 | |||
4737 | /* Update the small hash. Values in the small_table are offset by | ||
4738 | * HASH_CKOFFSET (1) to distinguish empty buckets from real offsets. */ | ||
4739 | static void | ||
4740 | xd3_scksum_insert (xd3_stream *stream, | ||
4741 | usize_t inx, | ||
4742 | usize_t scksum, | ||
4743 | usize_t pos) | ||
4744 | { | ||
4745 | /* If we are maintaining previous duplicates. */ | ||
4746 | if (stream->small_prev) | ||
4747 | { | ||
4748 | usize_t last_pos = stream->small_table[inx]; | ||
4749 | xd3_slist *pos_list = & stream->small_prev[pos & stream->sprevmask]; | ||
4750 | |||
4751 | /* Note last_pos is offset by HASH_CKOFFSET. */ | ||
4752 | pos_list->last_pos = last_pos; | ||
4753 | } | ||
4754 | |||
4755 | /* Enter the new position into the hash bucket. */ | ||
4756 | stream->small_table[inx] = pos + HASH_CKOFFSET; | ||
4757 | } | ||
4758 | |||
4759 | #if XD3_DEBUG | ||
4760 | static int | ||
4761 | xd3_check_smatch (const uint8_t *ref0, const uint8_t *inp0, | ||
4762 | const uint8_t *inp_max, usize_t cmp_len) | ||
4763 | { | ||
4764 | usize_t i; | ||
4765 | |||
4766 | for (i = 0; i < cmp_len; i += 1) | ||
4767 | { | ||
4768 | XD3_ASSERT (ref0[i] == inp0[i]); | ||
4769 | } | ||
4770 | |||
4771 | if (inp0 + cmp_len < inp_max) | ||
4772 | { | ||
4773 | XD3_ASSERT (inp0[i] != ref0[i]); | ||
4774 | } | ||
4775 | |||
4776 | return 1; | ||
4777 | } | ||
4778 | #endif /* XD3_DEBUG */ | ||
4779 | |||
4780 | /* When the hash table indicates a possible small string match, it | ||
4781 | * calls this routine to find the best match. The first matching | ||
4782 | * position is taken from the small_table, HASH_CKOFFSET is subtracted | ||
4783 | * to get the actual position. After checking that match, if previous | ||
4784 | * linked lists are in use (because stream->smatcher.small_chain > 1), | ||
4785 | * previous matches are tested searching for the longest match. If | ||
4786 | * (stream->min_match > MIN_MATCH) then a lazy match is in effect. | ||
4787 | */ | ||
4788 | static usize_t | ||
4789 | xd3_smatch (xd3_stream *stream, | ||
4790 | usize_t base, | ||
4791 | usize_t scksum, | ||
4792 | usize_t *match_offset) | ||
4793 | { | ||
4794 | usize_t cmp_len; | ||
4795 | usize_t match_length = 0; | ||
4796 | usize_t chain = (stream->min_match == MIN_MATCH ? | ||
4797 | stream->smatcher.small_chain : | ||
4798 | stream->smatcher.small_lchain); | ||
4799 | const uint8_t *inp_max = stream->next_in + stream->avail_in; | ||
4800 | const uint8_t *inp; | ||
4801 | const uint8_t *ref; | ||
4802 | |||
4803 | SMALL_HASH_DEBUG1 (stream, stream->next_in + stream->input_position); | ||
4804 | |||
4805 | XD3_ASSERT (stream->min_match + stream->input_position <= stream->avail_in); | ||
4806 | |||
4807 | base -= HASH_CKOFFSET; | ||
4808 | |||
4809 | again: | ||
4810 | |||
4811 | IF_DEBUG2 (DP(RINT "smatch at base=%u inp=%u cksum=%u\n", base, | ||
4812 | stream->input_position, scksum)); | ||
4813 | |||
4814 | /* For small matches, we can always go to the end-of-input because | ||
4815 | * the matching position must be less than the input position. */ | ||
4816 | XD3_ASSERT (base < stream->input_position); | ||
4817 | |||
4818 | ref = stream->next_in + base; | ||
4819 | inp = stream->next_in + stream->input_position; | ||
4820 | |||
4821 | SMALL_HASH_DEBUG2 (stream, ref); | ||
4822 | |||
4823 | /* Expand potential match forward. */ | ||
4824 | while (inp < inp_max && *inp == *ref) | ||
4825 | { | ||
4826 | ++inp; | ||
4827 | ++ref; | ||
4828 | } | ||
4829 | |||
4830 | cmp_len = (usize_t)(inp - (stream->next_in + stream->input_position)); | ||
4831 | |||
4832 | /* Verify correctness */ | ||
4833 | XD3_ASSERT (xd3_check_smatch (stream->next_in + base, | ||
4834 | stream->next_in + stream->input_position, | ||
4835 | inp_max, cmp_len)); | ||
4836 | |||
4837 | /* Update longest match */ | ||
4838 | if (cmp_len > match_length) | ||
4839 | { | ||
4840 | ( match_length) = cmp_len; | ||
4841 | (*match_offset) = base; | ||
4842 | |||
4843 | /* Stop if we match the entire input or have a long_enough match. */ | ||
4844 | if (inp == inp_max || cmp_len >= stream->smatcher.long_enough) | ||
4845 | { | ||
4846 | goto done; | ||
4847 | } | ||
4848 | } | ||
4849 | |||
4850 | /* If we have not reached the chain limit, see if there is another | ||
4851 | previous position. */ | ||
4852 | while (--chain != 0) | ||
4853 | { | ||
4854 | /* Calculate the previous offset. */ | ||
4855 | usize_t prev_pos = stream->small_prev[base & stream->sprevmask].last_pos; | ||
4856 | usize_t diff_pos; | ||
4857 | |||
4858 | if (prev_pos == 0) | ||
4859 | { | ||
4860 | break; | ||
4861 | } | ||
4862 | |||
4863 | prev_pos -= HASH_CKOFFSET; | ||
4864 | |||
4865 | if (prev_pos > base) | ||
4866 | { | ||
4867 | break; | ||
4868 | } | ||
4869 | |||
4870 | base = prev_pos; | ||
4871 | |||
4872 | XD3_ASSERT (stream->input_position > base); | ||
4873 | diff_pos = stream->input_position - base; | ||
4874 | |||
4875 | /* Stop searching if we go beyond sprevsz, since those entries | ||
4876 | * are for unrelated checksum entries. */ | ||
4877 | if (diff_pos & ~stream->sprevmask) | ||
4878 | { | ||
4879 | break; | ||
4880 | } | ||
4881 | |||
4882 | goto again; | ||
4883 | } | ||
4884 | |||
4885 | done: | ||
4886 | /* Crude efficiency test: if the match is very short and very far back, it's | ||
4887 | * unlikely to help, but the exact calculation requires knowing the state of | ||
4888 | * the address cache and adjacent instructions, which we can't do here. | ||
4889 | * Rather than encode a probably inefficient copy here and check it later | ||
4890 | * (which complicates the code a lot), do this: | ||
4891 | */ | ||
4892 | if (match_length == 4 && stream->input_position - (*match_offset) >= 1<<14) | ||
4893 | { | ||
4894 | /* It probably takes >2 bytes to encode an address >= 2^14 from here */ | ||
4895 | return 0; | ||
4896 | } | ||
4897 | if (match_length == 5 && stream->input_position - (*match_offset) >= 1<<21) | ||
4898 | { | ||
4899 | /* It probably takes >3 bytes to encode an address >= 2^21 from here */ | ||
4900 | return 0; | ||
4901 | } | ||
4902 | |||
4903 | /* It's unlikely that a window is large enough for the (match_length == 6 && | ||
4904 | * address >= 2^28) check */ | ||
4905 | return match_length; | ||
4906 | } | ||
4907 | |||
4908 | #if XD3_DEBUG | ||
4909 | static void | ||
4910 | xd3_verify_small_state (xd3_stream *stream, | ||
4911 | const uint8_t *inp, | ||
4912 | uint32_t x_cksum) | ||
4913 | { | ||
4914 | uint32_t state; | ||
4915 | uint32_t cksum = xd3_scksum (&state, inp, stream->smatcher.small_look); | ||
4916 | |||
4917 | XD3_ASSERT (cksum == x_cksum); | ||
4918 | } | ||
4919 | |||
4920 | static void | ||
4921 | xd3_verify_large_state (xd3_stream *stream, | ||
4922 | const uint8_t *inp, | ||
4923 | uint32_t x_cksum) | ||
4924 | { | ||
4925 | uint32_t cksum = xd3_lcksum (inp, stream->smatcher.large_look); | ||
4926 | XD3_ASSERT (cksum == x_cksum); | ||
4927 | } | ||
4928 | static void | ||
4929 | xd3_verify_run_state (xd3_stream *stream, | ||
4930 | const uint8_t *inp, | ||
4931 | usize_t x_run_l, | ||
4932 | uint8_t *x_run_c) | ||
4933 | { | ||
4934 | usize_t slook = stream->smatcher.small_look; | ||
4935 | uint8_t run_c; | ||
4936 | usize_t run_l = xd3_comprun (inp, slook, &run_c); | ||
4937 | |||
4938 | XD3_ASSERT (run_l == 0 || run_c == *x_run_c); | ||
4939 | XD3_ASSERT (x_run_l > slook || run_l == x_run_l); | ||
4940 | } | ||
4941 | #endif /* XD3_DEBUG */ | ||
4942 | |||
4943 | /* This function computes more source checksums to advance the window. | ||
4944 | * Called at every entrance to the string-match loop and each time | ||
4945 | * stream->input_position reaches the value returned as | ||
4946 | * *next_move_point. NB: this is one of the most expensive functions | ||
4947 | * in this code and also the most critical for good compression. | ||
4948 | * TODO: optimize the inner loop | ||
4949 | */ | ||
4950 | static int | ||
4951 | xd3_srcwin_move_point (xd3_stream *stream, usize_t *next_move_point) | ||
4952 | { | ||
4953 | xoff_t logical_input_cksum_pos; | ||
4954 | xoff_t source_size; | ||
4955 | |||
4956 | if (stream->src->eof_known) | ||
4957 | { | ||
4958 | source_size = xd3_source_eof (stream->src); | ||
4959 | XD3_ASSERT(stream->srcwin_cksum_pos <= source_size); | ||
4960 | |||
4961 | if (stream->srcwin_cksum_pos == source_size) | ||
4962 | { | ||
4963 | *next_move_point = USIZE_T_MAX; | ||
4964 | return 0; | ||
4965 | } | ||
4966 | } | ||
4967 | |||
4968 | /* Begin by advancing at twice the input rate, up to half the | ||
4969 | * maximum window size. */ | ||
4970 | logical_input_cksum_pos = min((stream->total_in + stream->input_position) * 2, | ||
4971 | (stream->total_in + stream->input_position) + | ||
4972 | (stream->srcwin_maxsz / 2)); | ||
4973 | |||
4974 | /* If srcwin_cksum_pos is already greater, wait until the difference | ||
4975 | * is met. */ | ||
4976 | if (stream->srcwin_cksum_pos > logical_input_cksum_pos) | ||
4977 | { | ||
4978 | *next_move_point = stream->input_position + | ||
4979 | (usize_t)(stream->srcwin_cksum_pos - logical_input_cksum_pos); | ||
4980 | return 0; | ||
4981 | } | ||
4982 | |||
4983 | /* A long match may have extended past srcwin_cksum_pos. Don't | ||
4984 | * start checksumming already-matched source data. */ | ||
4985 | if (stream->maxsrcaddr > stream->srcwin_cksum_pos) | ||
4986 | { | ||
4987 | stream->srcwin_cksum_pos = stream->maxsrcaddr; | ||
4988 | } | ||
4989 | |||
4990 | if (logical_input_cksum_pos < stream->srcwin_cksum_pos) | ||
4991 | { | ||
4992 | logical_input_cksum_pos = stream->srcwin_cksum_pos; | ||
4993 | } | ||
4994 | |||
4995 | /* Advance at least one source block. With the command-line | ||
4996 | * defaults this means: | ||
4997 | * | ||
4998 | * if (src->size <= srcwin_maxsz), index the entire source at once | ||
4999 | * using the position of the first non-match. This is good for | ||
5000 | * small inputs, especially when the content may have moved anywhere | ||
5001 | * in the file (e.g., tar files). | ||
5002 | * | ||
5003 | * if (src->size > srcwin_maxsz), index at least one block (which | ||
5004 | * the command-line sets to 1/32 of srcwin_maxsz) ahead of the | ||
5005 | * logical position. This is good for different reasons: when a | ||
5006 | * long match spanning several source blocks is encountered, this | ||
5007 | * avoids computing checksums for those blocks. If the data can | ||
5008 | * move anywhere, this is bad. | ||
5009 | */ | ||
5010 | logical_input_cksum_pos += stream->src->blksize; | ||
5011 | |||
5012 | while (stream->srcwin_cksum_pos < logical_input_cksum_pos && | ||
5013 | (!stream->src->eof_known || | ||
5014 | stream->srcwin_cksum_pos < xd3_source_eof (stream->src))) | ||
5015 | { | ||
5016 | xoff_t blkno; | ||
5017 | xoff_t blkbaseoffset; | ||
5018 | usize_t blkrem; | ||
5019 | ssize_t oldpos; /* Using ssize_t because of a */ | ||
5020 | ssize_t blkpos; /* do { blkpos-- } | ||
5021 | while (blkpos >= oldpos); */ | ||
5022 | int ret; | ||
5023 | xd3_blksize_div (stream->srcwin_cksum_pos, | ||
5024 | stream->src, &blkno, &blkrem); | ||
5025 | oldpos = blkrem; | ||
5026 | |||
5027 | if ((ret = xd3_getblk (stream, blkno))) | ||
5028 | { | ||
5029 | /* TOOFARBACK should never occur here, since we read forward. */ | ||
5030 | if (ret == XD3_TOOFARBACK) | ||
5031 | { | ||
5032 | ret = XD3_INTERNAL; | ||
5033 | } | ||
5034 | IF_DEBUG1 (DP(RINT | ||
5035 | "[srcwin_move_point] async getblk return for %"Q"u\n", | ||
5036 | blkno)); | ||
5037 | return ret; | ||
5038 | } | ||
5039 | |||
5040 | IF_DEBUG1 (DP(RINT | ||
5041 | "[srcwin_move_point] T=%"Q"u{%"Q"u} S=%"Q"u EOF=%"Q"u %s\n", | ||
5042 | stream->total_in + stream->input_position, | ||
5043 | logical_input_cksum_pos, | ||
5044 | stream->srcwin_cksum_pos, | ||
5045 | xd3_source_eof (stream->src), | ||
5046 | stream->src->eof_known ? "known" : "unknown")); | ||
5047 | |||
5048 | blkpos = xd3_bytes_on_srcblk (stream->src, blkno); | ||
5049 | |||
5050 | if (blkpos < (ssize_t) stream->smatcher.large_look) | ||
5051 | { | ||
5052 | stream->srcwin_cksum_pos = (blkno + 1) * stream->src->blksize; | ||
5053 | IF_DEBUG1 (DP(RINT "[srcwin_move_point] continue (end-of-block)\n")); | ||
5054 | continue; | ||
5055 | } | ||
5056 | |||
5057 | /* This inserts checksums for the entire block, in reverse, | ||
5058 | * starting from the end of the block. This logic does not test | ||
5059 | * stream->srcwin_cksum_pos because it always advances it to the | ||
5060 | * start of the next block. | ||
5061 | * | ||
5062 | * oldpos is the srcwin_cksum_pos within this block. blkpos is | ||
5063 | * the number of bytes available. Each iteration inspects | ||
5064 | * large_look bytes then steps back large_step bytes. The | ||
5065 | * if-stmt above ensures at least one large_look of data. */ | ||
5066 | blkpos -= stream->smatcher.large_look; | ||
5067 | blkbaseoffset = stream->src->blksize * blkno; | ||
5068 | |||
5069 | do | ||
5070 | { | ||
5071 | uint32_t cksum = xd3_lcksum (stream->src->curblk + blkpos, | ||
5072 | stream->smatcher.large_look); | ||
5073 | usize_t hval = xd3_checksum_hash (& stream->large_hash, cksum); | ||
5074 | |||
5075 | stream->large_table[hval] = | ||
5076 | (usize_t) (blkbaseoffset + | ||
5077 | (xoff_t)(blkpos + HASH_CKOFFSET)); | ||
5078 | |||
5079 | IF_DEBUG (stream->large_ckcnt += 1); | ||
5080 | |||
5081 | blkpos -= stream->smatcher.large_step; | ||
5082 | } | ||
5083 | while (blkpos >= oldpos); | ||
5084 | |||
5085 | stream->srcwin_cksum_pos = (blkno + 1) * stream->src->blksize; | ||
5086 | } | ||
5087 | |||
5088 | IF_DEBUG1 (DP(RINT | ||
5089 | "[srcwin_move_point] exited loop T=%"Q"u{%"Q"u} " | ||
5090 | "S=%"Q"u EOF=%"Q"u %s\n", | ||
5091 | stream->total_in + stream->input_position, | ||
5092 | logical_input_cksum_pos, | ||
5093 | stream->srcwin_cksum_pos, | ||
5094 | xd3_source_eof (stream->src), | ||
5095 | stream->src->eof_known ? "known" : "unknown")); | ||
5096 | |||
5097 | if (stream->src->eof_known) | ||
5098 | { | ||
5099 | source_size = xd3_source_eof (stream->src); | ||
5100 | |||
5101 | if (stream->srcwin_cksum_pos >= source_size) | ||
5102 | { | ||
5103 | /* This invariant is needed for xd3_source_cksum_offset() */ | ||
5104 | stream->srcwin_cksum_pos = source_size; | ||
5105 | *next_move_point = USIZE_T_MAX; | ||
5106 | IF_DEBUG1 (DP(RINT | ||
5107 | "[srcwin_move_point] finished with source input\n")); | ||
5108 | return 0; | ||
5109 | } | ||
5110 | } | ||
5111 | |||
5112 | /* How long until this function should be called again. */ | ||
5113 | XD3_ASSERT(stream->srcwin_cksum_pos >= logical_input_cksum_pos); | ||
5114 | *next_move_point = stream->input_position + 1 + | ||
5115 | (usize_t)(stream->srcwin_cksum_pos - logical_input_cksum_pos); | ||
5116 | return 0; | ||
5117 | } | ||
5118 | |||
5119 | #endif /* XD3_ENCODER */ | ||
5120 | |||
5121 | /******************************************************************** | ||
5122 | TEMPLATE pass | ||
5123 | *********************************************************************/ | ||
5124 | |||
5125 | #endif /* __XDELTA3_C_INLINE_PASS__ */ | ||
5126 | #ifdef __XDELTA3_C_TEMPLATE_PASS__ | ||
5127 | |||
5128 | #if XD3_ENCODER | ||
5129 | |||
5130 | /******************************************************************** | ||
5131 | Templates | ||
5132 | *******************************************************************/ | ||
5133 | |||
5134 | /* Template macros */ | ||
5135 | #define XD3_TEMPLATE(x) XD3_TEMPLATE2(x,TEMPLATE) | ||
5136 | #define XD3_TEMPLATE2(x,n) XD3_TEMPLATE3(x,n) | ||
5137 | #define XD3_TEMPLATE3(x,n) x ## n | ||
5138 | #define XD3_STRINGIFY(x) XD3_STRINGIFY2(x) | ||
5139 | #define XD3_STRINGIFY2(x) #x | ||
5140 | |||
5141 | static int XD3_TEMPLATE(xd3_string_match_) (xd3_stream *stream); | ||
5142 | |||
5143 | static const xd3_smatcher XD3_TEMPLATE(__smatcher_) = | ||
5144 | { | ||
5145 | XD3_STRINGIFY(TEMPLATE), | ||
5146 | XD3_TEMPLATE(xd3_string_match_), | ||
5147 | #if SOFTCFG == 1 | ||
5148 | 0, 0, 0, 0, 0, 0, 0 | ||
5149 | #else | ||
5150 | LLOOK, LSTEP, SLOOK, SCHAIN, SLCHAIN, MAXLAZY, LONGENOUGH | ||
5151 | #endif | ||
5152 | }; | ||
5153 | |||
5154 | static int | ||
5155 | XD3_TEMPLATE(xd3_string_match_) (xd3_stream *stream) | ||
5156 | { | ||
5157 | const int DO_SMALL = ! (stream->flags & XD3_NOCOMPRESS); | ||
5158 | const int DO_LARGE = (stream->src != NULL); | ||
5159 | const int DO_RUN = (1); | ||
5160 | |||
5161 | const uint8_t *inp; | ||
5162 | uint32_t scksum = 0; | ||
5163 | uint32_t scksum_state = 0; | ||
5164 | uint32_t lcksum = 0; | ||
5165 | usize_t sinx; | ||
5166 | usize_t linx; | ||
5167 | uint8_t run_c; | ||
5168 | usize_t run_l; | ||
5169 | int ret; | ||
5170 | usize_t match_length; | ||
5171 | usize_t match_offset = 0; | ||
5172 | usize_t next_move_point; | ||
5173 | |||
5174 | /* If there will be no compression due to settings or short input, | ||
5175 | * skip it entirely. */ | ||
5176 | if (! (DO_SMALL || DO_LARGE || DO_RUN) || | ||
5177 | stream->input_position + SLOOK > stream->avail_in) { goto loopnomore; } | ||
5178 | |||
5179 | if ((ret = xd3_string_match_init (stream))) { return ret; } | ||
5180 | |||
5181 | /* The restartloop label is reached when the incremental loop state | ||
5182 | * needs to be reset. */ | ||
5183 | restartloop: | ||
5184 | |||
5185 | /* If there is not enough input remaining for any kind of match, | ||
5186 | skip it. */ | ||
5187 | if (stream->input_position + SLOOK > stream->avail_in) { goto loopnomore; } | ||
5188 | |||
5189 | /* Now reset the incremental loop state: */ | ||
5190 | |||
5191 | /* The min_match variable is updated to avoid matching the same lazy | ||
5192 | * match over and over again. For example, if you find a (small) | ||
5193 | * match of length 9 at one position, you will likely find a match | ||
5194 | * of length 8 at the next position. */ | ||
5195 | if (xd3_iopt_last_matched (stream) > stream->input_position) | ||
5196 | { | ||
5197 | stream->min_match = max(MIN_MATCH, | ||
5198 | 1 + xd3_iopt_last_matched(stream) - | ||
5199 | stream->input_position); | ||
5200 | } | ||
5201 | else | ||
5202 | { | ||
5203 | stream->min_match = MIN_MATCH; | ||
5204 | } | ||
5205 | |||
5206 | /* The current input byte. */ | ||
5207 | inp = stream->next_in + stream->input_position; | ||
5208 | |||
5209 | /* Small match state. */ | ||
5210 | if (DO_SMALL) | ||
5211 | { | ||
5212 | scksum = xd3_scksum (&scksum_state, inp, SLOOK); | ||
5213 | } | ||
5214 | |||
5215 | /* Run state. */ | ||
5216 | if (DO_RUN) | ||
5217 | { | ||
5218 | run_l = xd3_comprun (inp, SLOOK, & run_c); | ||
5219 | } | ||
5220 | |||
5221 | /* Large match state. We continue the loop even after not enough | ||
5222 | * bytes for LLOOK remain, so always check stream->input_position in | ||
5223 | * DO_LARGE code. */ | ||
5224 | if (DO_LARGE && (stream->input_position + LLOOK <= stream->avail_in)) | ||
5225 | { | ||
5226 | /* Source window: next_move_point is the point that | ||
5227 | * stream->input_position must reach before computing more | ||
5228 | * source checksum. */ | ||
5229 | if ((ret = xd3_srcwin_move_point (stream, & next_move_point))) | ||
5230 | { | ||
5231 | return ret; | ||
5232 | } | ||
5233 | |||
5234 | lcksum = xd3_lcksum (inp, LLOOK); | ||
5235 | } | ||
5236 | |||
5237 | /* TRYLAZYLEN: True if a certain length match should be followed by | ||
5238 | * lazy search. This checks that LEN is shorter than MAXLAZY and | ||
5239 | * that there is enough leftover data to consider lazy matching. | ||
5240 | * "Enough" is set to 2 since the next match will start at the next | ||
5241 | * offset, it must match two extra characters. */ | ||
5242 | #define TRYLAZYLEN(LEN,POS,MAX) ((MAXLAZY) > 0 && (LEN) < (MAXLAZY) \ | ||
5243 | && (POS) + (LEN) <= (MAX) - 2) | ||
5244 | |||
5245 | /* HANDLELAZY: This statement is called each time an instruciton is | ||
5246 | * emitted (three cases). If the instruction is large enough, the | ||
5247 | * loop is restarted, otherwise lazy matching may ensue. */ | ||
5248 | #define HANDLELAZY(mlen) \ | ||
5249 | if (TRYLAZYLEN ((mlen), (stream->input_position), (stream->avail_in))) \ | ||
5250 | { stream->min_match = (mlen) + LEAST_MATCH_INCR; goto updateone; } \ | ||
5251 | else \ | ||
5252 | { stream->input_position += (mlen); goto restartloop; } | ||
5253 | |||
5254 | /* Now loop over one input byte at a time until a match is found... */ | ||
5255 | for (;; inp += 1, stream->input_position += 1) | ||
5256 | { | ||
5257 | /* Now we try three kinds of string match in order of expense: | ||
5258 | * run, large match, small match. */ | ||
5259 | |||
5260 | /* Expand the start of a RUN. The test for (run_l == SLOOK) | ||
5261 | * avoids repeating this check when we pass through a run area | ||
5262 | * performing lazy matching. The run is only expanded once when | ||
5263 | * the min_match is first reached. If lazy matching is | ||
5264 | * performed, the run_l variable will remain inconsistent until | ||
5265 | * the first non-running input character is reached, at which | ||
5266 | * time the run_l may then again grow to SLOOK. */ | ||
5267 | if (DO_RUN && run_l == SLOOK) | ||
5268 | { | ||
5269 | usize_t max_len = stream->avail_in - stream->input_position; | ||
5270 | |||
5271 | IF_DEBUG (xd3_verify_run_state (stream, inp, run_l, &run_c)); | ||
5272 | |||
5273 | while (run_l < max_len && inp[run_l] == run_c) { run_l += 1; } | ||
5274 | |||
5275 | /* Output a RUN instruction. */ | ||
5276 | if (run_l >= stream->min_match && run_l >= MIN_RUN) | ||
5277 | { | ||
5278 | if ((ret = xd3_emit_run (stream, stream->input_position, | ||
5279 | run_l, &run_c))) { return ret; } | ||
5280 | |||
5281 | HANDLELAZY (run_l); | ||
5282 | } | ||
5283 | } | ||
5284 | |||
5285 | /* If there is enough input remaining. */ | ||
5286 | if (DO_LARGE && (stream->input_position + LLOOK <= stream->avail_in)) | ||
5287 | { | ||
5288 | if ((stream->input_position >= next_move_point) && | ||
5289 | (ret = xd3_srcwin_move_point (stream, & next_move_point))) | ||
5290 | { | ||
5291 | return ret; | ||
5292 | } | ||
5293 | |||
5294 | linx = xd3_checksum_hash (& stream->large_hash, lcksum); | ||
5295 | |||
5296 | IF_DEBUG (xd3_verify_large_state (stream, inp, lcksum)); | ||
5297 | |||
5298 | if (stream->large_table[linx] != 0) | ||
5299 | { | ||
5300 | /* the match_setup will fail if the source window has | ||
5301 | * been decided and the match lies outside it. | ||
5302 | * OPT: Consider forcing a window at this point to | ||
5303 | * permit a new source window. */ | ||
5304 | xoff_t adj_offset = | ||
5305 | xd3_source_cksum_offset(stream, | ||
5306 | stream->large_table[linx] - | ||
5307 | HASH_CKOFFSET); | ||
5308 | if (xd3_source_match_setup (stream, adj_offset) == 0) | ||
5309 | { | ||
5310 | if ((ret = xd3_source_extend_match (stream))) | ||
5311 | { | ||
5312 | return ret; | ||
5313 | } | ||
5314 | |||
5315 | /* Update stream position. match_fwd is zero if no | ||
5316 | * match. */ | ||
5317 | if (stream->match_fwd > 0) | ||
5318 | { | ||
5319 | HANDLELAZY (stream->match_fwd); | ||
5320 | } | ||
5321 | } | ||
5322 | } | ||
5323 | } | ||
5324 | |||
5325 | /* Small matches. */ | ||
5326 | if (DO_SMALL) | ||
5327 | { | ||
5328 | sinx = xd3_checksum_hash (& stream->small_hash, scksum); | ||
5329 | |||
5330 | /* Verify incremental state in debugging mode. */ | ||
5331 | IF_DEBUG (xd3_verify_small_state (stream, inp, scksum)); | ||
5332 | |||
5333 | /* Search for the longest match */ | ||
5334 | if (stream->small_table[sinx] != 0) | ||
5335 | { | ||
5336 | match_length = xd3_smatch (stream, | ||
5337 | stream->small_table[sinx], | ||
5338 | scksum, | ||
5339 | & match_offset); | ||
5340 | } | ||
5341 | else | ||
5342 | { | ||
5343 | match_length = 0; | ||
5344 | } | ||
5345 | |||
5346 | /* Insert a hash for this string. */ | ||
5347 | xd3_scksum_insert (stream, sinx, scksum, stream->input_position); | ||
5348 | |||
5349 | /* Maybe output a COPY instruction */ | ||
5350 | if (match_length >= stream->min_match) | ||
5351 | { | ||
5352 | IF_DEBUG2 ({ | ||
5353 | static int x = 0; | ||
5354 | DP(RINT "[target match:%d] <inp %u %u> <cpy %u %u> " | ||
5355 | "(-%d) [ %u bytes ]\n", | ||
5356 | x++, | ||
5357 | stream->input_position, | ||
5358 | stream->input_position + match_length, | ||
5359 | match_offset, | ||
5360 | match_offset + match_length, | ||
5361 | stream->input_position - match_offset, | ||
5362 | match_length); | ||
5363 | }); | ||
5364 | |||
5365 | if ((ret = xd3_found_match (stream, | ||
5366 | /* decoder position */ | ||
5367 | stream->input_position, | ||
5368 | /* length */ match_length, | ||
5369 | /* address */ (xoff_t) match_offset, | ||
5370 | /* is_source */ 0))) | ||
5371 | { | ||
5372 | return ret; | ||
5373 | } | ||
5374 | |||
5375 | /* Copy instruction. */ | ||
5376 | HANDLELAZY (match_length); | ||
5377 | } | ||
5378 | } | ||
5379 | |||
5380 | /* The logic above prevents excess work during lazy matching by | ||
5381 | * increasing min_match to avoid smaller matches. Each time we | ||
5382 | * advance stream->input_position by one, the minimum match | ||
5383 | * shortens as well. */ | ||
5384 | if (stream->min_match > MIN_MATCH) | ||
5385 | { | ||
5386 | stream->min_match -= 1; | ||
5387 | } | ||
5388 | |||
5389 | updateone: | ||
5390 | |||
5391 | /* See if there are no more incremental cksums to compute. */ | ||
5392 | if (stream->input_position + SLOOK == stream->avail_in) | ||
5393 | { | ||
5394 | goto loopnomore; | ||
5395 | } | ||
5396 | |||
5397 | /* Compute next RUN, CKSUM */ | ||
5398 | if (DO_RUN) | ||
5399 | { | ||
5400 | NEXTRUN (inp[SLOOK]); | ||
5401 | } | ||
5402 | |||
5403 | if (DO_SMALL) | ||
5404 | { | ||
5405 | scksum = xd3_small_cksum_update (&scksum_state, inp, SLOOK); | ||
5406 | } | ||
5407 | |||
5408 | if (DO_LARGE && (stream->input_position + LLOOK < stream->avail_in)) | ||
5409 | { | ||
5410 | lcksum = xd3_large_cksum_update (lcksum, inp, LLOOK); | ||
5411 | } | ||
5412 | } | ||
5413 | |||
5414 | loopnomore: | ||
5415 | return 0; | ||
5416 | } | ||
5417 | |||
5418 | #endif /* XD3_ENCODER */ | ||
5419 | #endif /* __XDELTA3_C_TEMPLATE_PASS__ */ | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/main.m b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/main.m new file mode 100644 index 0000000..4bd53ea --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/main.m | |||
@@ -0,0 +1,18 @@ | |||
1 | // | ||
2 | // main.m | ||
3 | // xdelta3-ios-test | ||
4 | // | ||
5 | // Created by Joshua MacDonald on 6/16/12. | ||
6 | // Copyright (c) 2011, 2012 Joshua MacDonald. All rights reserved. | ||
7 | // | ||
8 | |||
9 | #import <UIKit/UIKit.h> | ||
10 | |||
11 | #import "Xd3iOSAppDelegate.h" | ||
12 | |||
13 | int main(int argc, char *argv[]) | ||
14 | { | ||
15 | @autoreleasepool { | ||
16 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([Xd3iOSAppDelegate class])); | ||
17 | } | ||
18 | } | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Info.plist b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Info.plist new file mode 100644 index 0000000..d0e8a58 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Info.plist | |||
@@ -0,0 +1,52 @@ | |||
1 | <?xml version="1.0" encoding="UTF-8"?> | ||
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> | ||
3 | <plist version="1.0"> | ||
4 | <dict> | ||
5 | <key>CFBundleDevelopmentRegion</key> | ||
6 | <string>en</string> | ||
7 | <key>CFBundleDisplayName</key> | ||
8 | <string>${PRODUCT_NAME}</string> | ||
9 | <key>CFBundleExecutable</key> | ||
10 | <string>${EXECUTABLE_NAME}</string> | ||
11 | <key>CFBundleIconFiles</key> | ||
12 | <array/> | ||
13 | <key>CFBundleIdentifier</key> | ||
14 | <string>Joshua-MacDonald.${PRODUCT_NAME:rfc1034identifier}</string> | ||
15 | <key>CFBundleInfoDictionaryVersion</key> | ||
16 | <string>6.0</string> | ||
17 | <key>CFBundleName</key> | ||
18 | <string>${PRODUCT_NAME}</string> | ||
19 | <key>CFBundlePackageType</key> | ||
20 | <string>APPL</string> | ||
21 | <key>CFBundleShortVersionString</key> | ||
22 | <string>1.0</string> | ||
23 | <key>CFBundleSignature</key> | ||
24 | <string>????</string> | ||
25 | <key>CFBundleVersion</key> | ||
26 | <string>1.0</string> | ||
27 | <key>LSRequiresIPhoneOS</key> | ||
28 | <true/> | ||
29 | <key>UIMainStoryboardFile</key> | ||
30 | <string>MainStoryboard_iPhone</string> | ||
31 | <key>UIMainStoryboardFile~ipad</key> | ||
32 | <string>MainStoryboard_iPad</string> | ||
33 | <key>UIRequiredDeviceCapabilities</key> | ||
34 | <array> | ||
35 | <string>armv7</string> | ||
36 | </array> | ||
37 | <key>UISupportedInterfaceOrientations</key> | ||
38 | <array> | ||
39 | <string>UIInterfaceOrientationPortrait</string> | ||
40 | <string>UIInterfaceOrientationLandscapeLeft</string> | ||
41 | <string>UIInterfaceOrientationLandscapeRight</string> | ||
42 | <string>UIInterfaceOrientationPortraitUpsideDown</string> | ||
43 | </array> | ||
44 | <key>UISupportedInterfaceOrientations~ipad</key> | ||
45 | <array> | ||
46 | <string>UIInterfaceOrientationPortrait</string> | ||
47 | <string>UIInterfaceOrientationPortraitUpsideDown</string> | ||
48 | <string>UIInterfaceOrientationLandscapeLeft</string> | ||
49 | <string>UIInterfaceOrientationLandscapeRight</string> | ||
50 | </array> | ||
51 | </dict> | ||
52 | </plist> | ||
diff --git a/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Prefix.pch b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Prefix.pch new file mode 100644 index 0000000..69f0135 --- /dev/null +++ b/xdelta3/examples/iOS/xdelta3-ios-test/xdelta3-ios-test/xdelta3-ios-test-Prefix.pch | |||
@@ -0,0 +1,14 @@ | |||
1 | // | ||
2 | // Prefix header for all source files of the 'xdelta3-ios-test' target in the 'xdelta3-ios-test' project | ||
3 | // | ||
4 | |||
5 | #import <Availability.h> | ||
6 | |||
7 | #ifndef __IPHONE_5_0 | ||
8 | #warning "This project uses features only available in iOS SDK 5.0 and later." | ||
9 | #endif | ||
10 | |||
11 | #ifdef __OBJC__ | ||
12 | #import <UIKit/UIKit.h> | ||
13 | #import <Foundation/Foundation.h> | ||
14 | #endif | ||