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99 lines
2.8 KiB
99 lines
2.8 KiB
// 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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//
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// Modified to return number of bytes written by Writer.WriteMsg(), and added byteReader.
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package protoio
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import (
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"io"
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"github.com/gogo/protobuf/proto"
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)
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type Writer interface {
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WriteMsg(proto.Message) (int, error)
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}
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type WriteCloser interface {
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Writer
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io.Closer
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}
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type Reader interface {
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ReadMsg(msg proto.Message) (int, error)
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}
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type ReadCloser interface {
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Reader
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io.Closer
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}
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type marshaler interface {
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MarshalTo(data []byte) (n int, err error)
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}
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func getSize(v interface{}) (int, bool) {
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if sz, ok := v.(interface {
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Size() (n int)
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}); ok {
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return sz.Size(), true
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} else if sz, ok := v.(interface {
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ProtoSize() (n int)
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}); ok {
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return sz.ProtoSize(), true
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} else {
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return 0, false
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}
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}
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// byteReader wraps an io.Reader and implements io.ByteReader, required by
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// binary.ReadUvarint(). Reading one byte at a time is extremely slow, but this
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// is what Amino did previously anyway, and the caller can wrap the underlying
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// reader in a bufio.Reader if appropriate.
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type byteReader struct {
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reader io.Reader
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buf []byte
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bytesRead int // keeps track of bytes read via ReadByte()
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}
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func newByteReader(r io.Reader) *byteReader {
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return &byteReader{
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reader: r,
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buf: make([]byte, 1),
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}
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}
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func (r *byteReader) ReadByte() (byte, error) {
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n, err := r.reader.Read(r.buf)
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r.bytesRead += n
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if err != nil {
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return 0x00, err
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}
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return r.buf[0], nil
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}
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