regtest.go tests a random stream and an offset copy

1 files changed, 92 insertions, 8 deletions

diff --git a/xdelta3/go/src/regtest.go b/xdelta3/go/src/regtest.go
index aee419d..d31e905 100644
--- a/xdelta3/go/src/regtest.go
+++ b/xdelta3/go/src/regtest.go
@@ -1,13 +1,17 @@
 package main
 
 import (
+        "bytes"
+        "fmt"
         "io"
         "io/ioutil"
         "xdelta"
 )
 
 const (
+        blocksize = 1<<20
         prog = "/Users/jmacd/src/xdelta/xdelta3/xdelta3"
+        seed = 1422253499919909358
 )
 
 func drain(f io.ReadCloser) <-chan []byte {
@@ -39,16 +43,11 @@ func write(f io.WriteCloser, b []byte) {
         }
 }
 
-func main() {
-        x := xdelta.Program{prog}
-        smokeTest(x)
-}
-
-func smokeTest(p xdelta.Program) {
+func smokeTest(r *xdelta.Runner, p *xdelta.Program) {
         target := "Hello world!"
         source := "Hello world, nice to meet you!"
         
-        run, err := p.Exec(true, []string{"-e"})
+        run, err := r.Exec(p, true, []string{"-e"})
         if err != nil {
                 panic(err)
         }
@@ -62,7 +61,7 @@ func smokeTest(p xdelta.Program) {
                 panic(err)
         }
 
-        run, err = p.Exec(true, []string{"-d"})
+        run, err = r.Exec(p, true, []string{"-d"})
         if err != nil {
                 panic(err)
         }
@@ -81,3 +80,88 @@ func smokeTest(p xdelta.Program) {
                 panic("It's not working!!!")
         }
 }
+
+func copyStreams(r io.ReadCloser, w io.WriteCloser) {
+        _, err := io.Copy(w, r)
+        if err != nil {
+                panic(err)
+        }
+        err = r.Close()
+        if err != nil {
+                panic(err)
+        }
+        err = w.Close()
+        if err != nil {
+                panic(err)
+        }
+}
+
+func compareStreams(r1 io.ReadCloser, r2 io.ReadCloser, length int64) {
+        b1 := make([]byte, blocksize)
+        b2 := make([]byte, blocksize)
+        var idx int64
+        for length > 0 {
+                c := blocksize
+                if length < blocksize {
+                        c = int(length)
+                }
+                if _, err := io.ReadFull(r1, b1[0:c]); err != nil {
+                        panic(err)
+                }
+                if _, err := io.ReadFull(r2, b2[0:c]); err != nil {
+                        panic(err)
+                }
+                if bytes.Compare(b1[0:c], b2[0:c]) != 0 {
+                        fmt.Println("B1 is", string(b1[0:c]))
+                        fmt.Println("B2 is", string(b2[0:c]))                   
+                        panic(fmt.Sprint("Bytes do not compare at ", idx))
+                }
+                length -= int64(c)
+                idx += int64(c)
+        }
+}
+
+func offsetTest(r *xdelta.Runner, p *xdelta.Program, offset, length int64) {
+        enc, err := r.Exec(p, true, []string{"-e"})
+        if err != nil {
+                panic(err)
+        }
+        dec, err := r.Exec(p, true, []string{"-d"})
+        if err != nil {
+                panic(err)
+        }
+
+        read, write := io.Pipe()
+
+        go copyStreams(enc.Stdout, dec.Stdin)
+        go compareStreams(dec.Stdout, read, length)
+
+        empty(enc.Stderr)  // Use these?
+        empty(dec.Stderr)
+
+        // TODO: seems possible to use one WriteRstreams call to generate
+        // the source and target for both encoder and decoder.  Why not?
+        xdelta.WriteRstreams(seed, offset, length, enc.Srcin, enc.Stdin)
+        xdelta.WriteRstreams(seed, offset, length, dec.Srcin, write)
+
+        if err := enc.Cmd.Wait(); err != nil {
+                panic(err)
+        }
+        if err := dec.Cmd.Wait(); err != nil {
+                panic(err)
+        }
+}
+
+func main() {
+        r, err := xdelta.NewRunner()
+        if err != nil {
+                panic(err)
+        }
+        defer r.Cleanup()
+
+        prog := &xdelta.Program{prog}
+
+        smokeTest(r, prog)
+
+        offsetTest(r, prog, 0, 1024 << 20)
+}