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// Copyright 2014 go-dockerclient authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testing
import (
"encoding/binary"
"errors"
"io"
)
type stdType [8]byte
var (
stdin = stdType{0: 0}
stdout = stdType{0: 1}
stderr = stdType{0: 2}
)
type stdWriter struct {
io.Writer
prefix stdType
sizeBuf []byte
}
func (w *stdWriter) Write(buf []byte) (n int, err error) {
if w == nil || w.Writer == nil {
return 0, errors.New("Writer not instanciated")
}
binary.BigEndian.PutUint32(w.prefix[4:], uint32(len(buf)))
buf = append(w.prefix[:], buf...)
n, err = w.Writer.Write(buf)
return n - 8, err
}
func newStdWriter(w io.Writer, t stdType) *stdWriter {
if len(t) != 8 {
return nil
}
return &stdWriter{Writer: w, prefix: t, sizeBuf: make([]byte, 4)}
}
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