| // 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)) |
| } |