72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
package xdelta
|
|
|
|
|
|
import (
|
|
"io"
|
|
"math/rand"
|
|
)
|
|
|
|
const (
|
|
blocksize = 1<<17
|
|
)
|
|
|
|
func (t *TestGroup) WriteRstreams(desc string, seed, offset, len int64,
|
|
src, tgt io.WriteCloser) {
|
|
t.Go("src-write:"+desc, func (g *Goroutine) {
|
|
writeOne(g, seed, 0, len, tgt, false)
|
|
})
|
|
t.Go("tgt-write:"+desc, func (g *Goroutine) {
|
|
writeOne(g, seed, offset, len, src, true)
|
|
})
|
|
}
|
|
|
|
func writeOne(g *Goroutine, seed, offset, len int64, stream io.WriteCloser, readall bool) {
|
|
if !readall {
|
|
// Allow the source-read to fail or block until the process terminates.
|
|
// This behavior is reserved for the decoder, which is not required to
|
|
// read the entire source.
|
|
g.OK()
|
|
}
|
|
if offset != 0 {
|
|
// Fill with other random data until the offset
|
|
if err := writeRand(g, rand.New(rand.NewSource(^seed)), offset, stream); err != nil {
|
|
g.Panic(err)
|
|
}
|
|
}
|
|
if err := writeRand(g, rand.New(rand.NewSource(seed)),
|
|
len - offset, stream); err != nil {
|
|
g.Panic(err)
|
|
}
|
|
if err := stream.Close(); err != nil {
|
|
g.Panic(err)
|
|
}
|
|
g.OK()
|
|
}
|
|
|
|
func writeRand(g *Goroutine, r *rand.Rand, len int64, s io.Writer) error {
|
|
blk := make([]byte, blocksize)
|
|
for len > 0 {
|
|
fillRand(r, blk)
|
|
c := blocksize
|
|
if len < blocksize {
|
|
c = int(len)
|
|
}
|
|
if _, err := s.Write(blk[0:c]); err != nil {
|
|
return err
|
|
}
|
|
len -= int64(c)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func fillRand(r *rand.Rand, blk []byte) {
|
|
for p := 0; p < len(blk); {
|
|
v := r.Int63()
|
|
for i := 7; i != 0 && p < len(blk); i-- {
|
|
blk[p] = byte(v)
|
|
p++
|
|
v >>= 8
|
|
}
|
|
}
|
|
}
|