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// Extensions for Protocol Buffers to create more go like structures.
//
// Copyright (c) 2013, Vastech SA (PTY) LTD. All rights reserved.
// http://code.google.com/p/gogoprotobuf/gogoproto
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package io
import (
"code.google.com/p/gogoprotobuf/proto"
"encoding/binary"
"errors"
"io"
)
var (
errSmallBuffer = errors.New("Buffer Too Small")
errLargeValue = errors.New("Value is Larger than 64 bits")
)
func NewDelimitedWriter(w io.Writer) WriteCloser {
return &varintWriter{w, make([]byte, 10), nil}
}
type varintWriter struct {
w io.Writer
lenBuf []byte
buffer []byte
}
func (this *varintWriter) WriteMsg(msg proto.Message) (err error) {
var data []byte
if m, ok := msg.(marshaler); ok {
n := m.Size()
if n >= len(this.buffer) {
this.buffer = make([]byte, n)
}
_, err = m.MarshalTo(this.buffer)
if err != nil {
return err
}
data = this.buffer[:n]
} else {
data, err = proto.Marshal(msg)
if err != nil {
return err
}
}
length := uint64(len(data))
n := binary.PutUvarint(this.lenBuf, length)
_, err = this.w.Write(this.lenBuf[:n])
if err != nil {
return err
}
_, err = this.w.Write(data)
return err
}
func (this *varintWriter) Close() error {
if closer, ok := this.w.(io.Closer); ok {
return closer.Close()
}
return nil
}
func NewDelimitedReader(r io.Reader, maxSize int) ReadCloser {
return &varintReader{r, make([]byte, 10), nil, maxSize}
}
type varintReader struct {
r io.Reader
lenBuf []byte
buf []byte
maxSize int
}
func (this *varintReader) ReadMsg(msg proto.Message) error {
firstLen, err := this.r.Read(this.lenBuf)
if err != nil {
return err
}
length64, lenLen := binary.Uvarint(this.lenBuf)
if lenLen <= 0 {
if lenLen == 0 {
return errSmallBuffer
}
return errLargeValue
}
msgLen := int(length64)
if len(this.buf) < msgLen {
this.buf = make([]byte, msgLen)
}
prefixN := copy(this.buf, this.lenBuf[lenLen:firstLen])
if _, err := io.ReadFull(this.r, this.buf[prefixN:msgLen]); err != nil {
return err
}
return proto.Unmarshal(this.buf[:msgLen], msg)
}
func (this *varintReader) Close() error {
if closer, ok := this.r.(io.Closer); ok {
return closer.Close()
}
return nil
}
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