1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* Copyright (C) 2007 Josh MacDonald */
#include <stdio.h>
#define SPACE_MAX 32768
#define PAGE_SIZE 4096
#define OUTPUT_MAX 1024
#define IOPT_SIZE 1024
#define XD3_ALLOCSIZE 256
// typedef void* (xd3_alloc_func) (void *opaque,
// usize_t items,
// usize_t size);
// typedef void (xd3_free_func) (void *opaque,
// void *address);
#include "xdelta3.h"
#include "xdelta3.c"
typedef struct _context {
uint8_t *buffer;
int allocated;
} context_t;
void*
process_alloc (void* opaque, usize_t items, usize_t size)
{
context_t *ctx = (context_t*) opaque;
usize_t t = items * size;
void *ret;
if (ctx->allocated + t > SPACE_MAX)
{
return NULL;
}
ret = ctx->buffer + ctx->allocated;
ctx->allocated += t;
return ret;
}
int
process_page (int is_encode,
int (*func) (xd3_stream *),
const uint8_t *input,
usize_t input_size,
const uint8_t *source,
uint8_t *output,
usize_t *output_size,
usize_t output_size_max,
int flags) {
xd3_stream *stream;
xd3_config *config;
xd3_source *src;
context_t *ctx = calloc(OUTPUT_MAX, 1);
int ret;
ctx->buffer = ((char*)ctx) + sizeof(*ctx);
ctx->allocated = sizeof(*ctx);
stream = process_alloc (ctx, 1, sizeof(*stream));
config = process_alloc (ctx, 1, sizeof(*config));
src = process_alloc (ctx, 1, sizeof(*src));
config->flags = flags;
config->winsize = PAGE_SIZE;
config->sprevsz = PAGE_SIZE;
config->srcwin_maxsz = PAGE_SIZE;
config->iopt_size = IOPT_SIZE;
config->alloc = &process_alloc;
src->size = PAGE_SIZE;
src->blksize = PAGE_SIZE;
src->onblk = PAGE_SIZE;
src->curblk = source;
src->curblkno = 0;
if ((ret = xd3_config_stream (stream, config)) != 0 ||
(ret = xd3_set_source (stream, src)) != 0 ||
(ret = xd3_process_stream (is_encode,
stream,
func, 1,
input, PAGE_SIZE,
output, output_size,
output_size_max)) != 0)
{
// (void) 0;
}
xd3_free_stream (stream);
return ret;
}
int test(int stride, int encode_flags)
{
uint8_t frompg[PAGE_SIZE];
uint8_t topg[PAGE_SIZE];
uint8_t output[OUTPUT_MAX];
uint8_t reout[OUTPUT_MAX];
usize_t output_size;
usize_t re_size;
int i, j, ret;
for (i = 0; i < PAGE_SIZE; i++)
{
topg[i] = frompg[i] = lrand48();
}
// change 1 byte every stride
if (stride > 0)
{
for (j = stride; j <= PAGE_SIZE; j += stride)
{
topg[j - 1] ^= 0xff;
}
}
if ((ret = process_page (1, xd3_encode_input,
topg, PAGE_SIZE,
frompg, output,
&output_size, OUTPUT_MAX,
encode_flags)) != 0)
{
return ret;
}
if ((ret = process_page (1, xd3_decode_input,
output, output_size,
frompg, reout,
&re_size, PAGE_SIZE,
0)) != 0)
{
return ret;
}
if (output_size > OUTPUT_MAX || re_size != PAGE_SIZE)
{
printf ("internal error\n");
return -1;
}
printf("stride %d flags 0x%x size %u ", stride, encode_flags, output_size);
printf("%s\n", (ret == 0) ? "OK" : "FAIL");
return 0;
}
int main()
{
int stride;
int level;
int ret;
for (level = 1; level < 10; level = (level == 1 ? 3 : level + 3))
{
int lflag = level << XD3_COMPLEVEL_SHIFT;
for (stride = 0; stride <= PAGE_SIZE; stride += PAGE_SIZE / 64)
{
if ((ret = test(stride, lflag)) ||
(ret = test(stride, lflag | XD3_ADLER32)) ||
(ret = test(stride, lflag | XD3_SEC_DJW)))
{
return ret;
}
}
}
return 0;
}
|
