mirror of
https://github.com/octoleo/syncthing.git
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139 lines
3.8 KiB
Go
139 lines
3.8 KiB
Go
// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package io
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import (
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"encoding/binary"
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"io"
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"github.com/gogo/protobuf/proto"
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)
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const uint32BinaryLen = 4
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func NewUint32DelimitedWriter(w io.Writer, byteOrder binary.ByteOrder) WriteCloser {
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return &uint32Writer{w, byteOrder, nil, make([]byte, uint32BinaryLen)}
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}
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func NewSizeUint32DelimitedWriter(w io.Writer, byteOrder binary.ByteOrder, size int) WriteCloser {
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return &uint32Writer{w, byteOrder, make([]byte, size), make([]byte, uint32BinaryLen)}
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}
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type uint32Writer struct {
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w io.Writer
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byteOrder binary.ByteOrder
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buffer []byte
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lenBuf []byte
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}
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func (this *uint32Writer) writeFallback(msg proto.Message) error {
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data, err := proto.Marshal(msg)
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if err != nil {
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return err
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}
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length := uint32(len(data))
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this.byteOrder.PutUint32(this.lenBuf, length)
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if _, err = this.w.Write(this.lenBuf); err != nil {
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return err
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}
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_, err = this.w.Write(data)
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return err
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}
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func (this *uint32Writer) WriteMsg(msg proto.Message) error {
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m, ok := msg.(marshaler)
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if !ok {
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return this.writeFallback(msg)
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}
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n, ok := getSize(m)
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if !ok {
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return this.writeFallback(msg)
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}
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size := n + uint32BinaryLen
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if size > len(this.buffer) {
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this.buffer = make([]byte, size)
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}
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this.byteOrder.PutUint32(this.buffer, uint32(n))
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if _, err := m.MarshalTo(this.buffer[uint32BinaryLen:]); err != nil {
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return err
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}
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_, err := this.w.Write(this.buffer[:size])
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return err
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}
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func (this *uint32Writer) Close() error {
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if closer, ok := this.w.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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type uint32Reader struct {
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r io.Reader
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byteOrder binary.ByteOrder
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lenBuf []byte
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buf []byte
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maxSize int
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}
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func NewUint32DelimitedReader(r io.Reader, byteOrder binary.ByteOrder, maxSize int) ReadCloser {
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return &uint32Reader{r, byteOrder, make([]byte, 4), nil, maxSize}
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}
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func (this *uint32Reader) ReadMsg(msg proto.Message) error {
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if _, err := io.ReadFull(this.r, this.lenBuf); err != nil {
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return err
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}
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length32 := this.byteOrder.Uint32(this.lenBuf)
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length := int(length32)
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if length < 0 || length > this.maxSize {
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return io.ErrShortBuffer
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}
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if length >= len(this.buf) {
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this.buf = make([]byte, length)
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}
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_, err := io.ReadFull(this.r, this.buf[:length])
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if err != nil {
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return err
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}
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return proto.Unmarshal(this.buf[:length], msg)
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}
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func (this *uint32Reader) Close() error {
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if closer, ok := this.r.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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