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|
package main
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"xdelta"
)
const (
blocksize = 1<<16
winsize = 1<<26
prog = "/Users/jmacd/src/xdelta/xdelta3/build/m64/64size-64off/xdelta3"
seed = 1422253499919909358
)
func drain(f io.ReadCloser) <-chan []byte {
c := make(chan []byte)
go func() {
if b, err := ioutil.ReadAll(f); err != nil {
panic(err)
} else {
c <- b
}
}()
return c
}
func empty(f io.ReadCloser, desc string) {
go func() {
s := bufio.NewScanner(f)
for s.Scan() {
os.Stderr.Write([]byte(fmt.Sprint(desc, ": ", s.Text(), "\n")))
}
if err := s.Err(); err != nil {
fmt.Println("error reading input:", err)
}
}()
}
func write(f io.WriteCloser, b []byte) {
if _, err := f.Write(b); err != nil {
panic(err)
}
if err := f.Close(); err != nil {
panic(err)
}
}
func smokeTest(r *xdelta.Runner, p *xdelta.Program) {
target := "Hello world!"
source := "Hello world, nice to meet you!"
run, err := r.Exec(p, true, []string{"-e"})
if err != nil {
panic(err)
}
encodeout := drain(run.Stdout)
empty(run.Stderr, "encode")
write(run.Stdin, []byte(target))
write(run.Srcin, []byte(source))
if err := run.Cmd.Wait(); err != nil {
panic(err)
}
run, err = r.Exec(p, true, []string{"-d"})
if err != nil {
panic(err)
}
decodeout := drain(run.Stdout)
empty(run.Stderr, "decode")
write(run.Stdin, <-encodeout)
write(run.Srcin, []byte(source))
if err := run.Cmd.Wait(); err != nil {
panic(err)
}
if string(<-decodeout) != target {
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, bufsize, length int64) {
enc, err := r.Exec(p, true, []string{"-e", "-1", "-n", fmt.Sprint("-B", bufsize), "-vv", fmt.Sprint("-W", winsize)})
if err != nil {
panic(err)
}
dec, err := r.Exec(p, true, []string{"-d", fmt.Sprint("-B", bufsize), "-vv", fmt.Sprint("-W", winsize)})
if err != nil {
panic(err)
}
read, write := io.Pipe()
go copyStreams(enc.Stdout, dec.Stdin)
go compareStreams(dec.Stdout, read, length)
empty(enc.Stderr, "encode")
empty(dec.Stderr, "decode")
// 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, 1 << 31, 1 << 32, 1 << 33)
}
|
