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