92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
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// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2015, 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 codec
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import (
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"github.com/gogo/protobuf/proto"
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)
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type Codec interface {
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Marshal(v interface{}) ([]byte, error)
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Unmarshal(data []byte, v interface{}) error
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String() string
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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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type codec struct {
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buf []byte
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}
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func (this *codec) String() string {
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return "proto"
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}
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func New(size int) Codec {
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return &codec{make([]byte, size)}
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}
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func (this *codec) Marshal(v interface{}) ([]byte, error) {
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if m, ok := v.(marshaler); ok {
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n, ok := getSize(v)
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if !ok {
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return proto.Marshal(v.(proto.Message))
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}
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if n > len(this.buf) {
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this.buf = make([]byte, n)
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}
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_, err := m.MarshalTo(this.buf)
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if err != nil {
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return nil, err
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}
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return this.buf[:n], nil
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}
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return proto.Marshal(v.(proto.Message))
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}
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func (this *codec) Unmarshal(data []byte, v interface{}) error {
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return proto.Unmarshal(data, v.(proto.Message))
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}
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