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io.go
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io.go
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// Protocol Buffers for Go with Gadgets
//
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
// http://github.com/gogo/protobuf
//
// 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.
//
// Modified to return number of bytes written by Writer.WriteMsg(), and added byteReader.
package protoio
import (
"io"
"github.com/gogo/protobuf/proto"
)
type Writer interface {
WriteMsg(proto.Message) (int, error)
}
type WriteCloser interface {
Writer
io.Closer
}
type Reader interface {
ReadMsg(msg proto.Message) (int, error)
}
type ReadCloser interface {
Reader
io.Closer
}
type marshaler interface {
MarshalTo(data []byte) (n int, err error)
}
func getSize(v interface{}) (int, bool) {
if sz, ok := v.(interface {
Size() (n int)
}); ok {
return sz.Size(), true
} else if sz, ok := v.(interface {
ProtoSize() (n int)
}); ok {
return sz.ProtoSize(), true
} else {
return 0, false
}
}
// byteReader wraps an io.Reader and implements io.ByteReader, required by
// binary.ReadUvarint(). Reading one byte at a time is extremely slow, but this
// is what Amino did previously anyway, and the caller can wrap the underlying
// reader in a bufio.Reader if appropriate.
type byteReader struct {
reader io.Reader
buf []byte
bytesRead int // keeps track of bytes read via ReadByte()
}
func newByteReader(r io.Reader) *byteReader {
return &byteReader{
reader: r,
buf: make([]byte, 1),
}
}
func (r *byteReader) ReadByte() (byte, error) {
n, err := r.reader.Read(r.buf)
r.bytesRead += n
if err != nil {
return 0x00, err
}
return r.buf[0], nil
}