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// Copyright 2014 Docker authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the DOCKER-LICENSE file.
package docker
import (
"encoding/binary"
"errors"
"io"
)
const (
stdWriterPrefixLen = 8
stdWriterFdIndex = 0
stdWriterSizeIndex = 4
)
var errInvalidStdHeader = errors.New("Unrecognized input header")
func stdCopy(dstout, dsterr io.Writer, src io.Reader) (written int64, err error) {
var (
buf = make([]byte, 32*1024+stdWriterPrefixLen+1)
bufLen = len(buf)
nr, nw int
er, ew error
out io.Writer
frameSize int
)
for {
for nr < stdWriterPrefixLen {
var nr2 int
nr2, er = src.Read(buf[nr:])
if er == io.EOF {
if nr < stdWriterPrefixLen && nr2 < stdWriterPrefixLen {
return written, nil
}
nr += nr2
break
} else if er != nil {
return 0, er
}
nr += nr2
}
switch buf[stdWriterFdIndex] {
case 0:
fallthrough
case 1:
out = dstout
case 2:
out = dsterr
default:
return 0, errInvalidStdHeader
}
frameSize = int(binary.BigEndian.Uint32(buf[stdWriterSizeIndex : stdWriterSizeIndex+4]))
if frameSize+stdWriterPrefixLen > bufLen {
buf = append(buf, make([]byte, frameSize+stdWriterPrefixLen-len(buf)+1)...)
bufLen = len(buf)
}
for nr < frameSize+stdWriterPrefixLen {
var nr2 int
nr2, er = src.Read(buf[nr:])
if er == io.EOF {
if nr == 0 {
return written, nil
}
nr += nr2
break
} else if er != nil {
return 0, er
}
nr += nr2
}
bound := frameSize + stdWriterPrefixLen
if bound > nr {
bound = nr
}
nw, ew = out.Write(buf[stdWriterPrefixLen:bound])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
return 0, ew
}
if nw != frameSize {
return written, io.ErrShortWrite
}
copy(buf, buf[frameSize+stdWriterPrefixLen:])
nr -= frameSize + stdWriterPrefixLen
}
}
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