1// Protocol Buffers for Go with Gadgets
2//
3// Copyright (c) 2013, The GoGo Authors. All rights reserved.
4// http://github.com/gogo/protobuf
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met:
9//
10//     * Redistributions of source code must retain the above copyright
11// notice, this list of conditions and the following disclaimer.
12//     * Redistributions in binary form must reproduce the above
13// copyright notice, this list of conditions and the following disclaimer
14// in the documentation and/or other materials provided with the
15// distribution.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29package io
30
31import (
32	"github.com/gogo/protobuf/proto"
33	"io"
34)
35
36type Writer interface {
37	WriteMsg(proto.Message) error
38}
39
40type WriteCloser interface {
41	Writer
42	io.Closer
43}
44
45type Reader interface {
46	ReadMsg(msg proto.Message) error
47}
48
49type ReadCloser interface {
50	Reader
51	io.Closer
52}
53
54type marshaler interface {
55	MarshalTo(data []byte) (n int, err error)
56}
57
58func getSize(v interface{}) (int, bool) {
59	if sz, ok := v.(interface {
60		Size() (n int)
61	}); ok {
62		return sz.Size(), true
63	} else if sz, ok := v.(interface {
64		ProtoSize() (n int)
65	}); ok {
66		return sz.ProtoSize(), true
67	} else {
68		return 0, false
69	}
70}
71