1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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.
#endregion
namespace Google.Protobuf
{
/// <summary>
/// This class is used internally by the Protocol Buffer Library and generated
/// message implementations. It is public only for the sake of those generated
/// messages. Others should not use this class directly.
/// <para>
/// This class contains constants and helper functions useful for dealing with
/// the Protocol Buffer wire format.
/// </para>
/// </summary>
public static class WireFormat
{
/// <summary>
/// Wire types within protobuf encoding.
/// </summary>
public enum WireType : uint
{
/// <summary>
/// Variable-length integer.
/// </summary>
Varint = 0,
/// <summary>
/// A fixed-length 64-bit value.
/// </summary>
Fixed64 = 1,
/// <summary>
/// A length-delimited value, i.e. a length followed by that many bytes of data.
/// </summary>
LengthDelimited = 2,
/// <summary>
/// A "start group" value
/// </summary>
StartGroup = 3,
/// <summary>
/// An "end group" value
/// </summary>
EndGroup = 4,
/// <summary>
/// A fixed-length 32-bit value.
/// </summary>
Fixed32 = 5
}
private const int TagTypeBits = 3;
private const uint TagTypeMask = (1 << TagTypeBits) - 1;
/// <summary>
/// Given a tag value, determines the wire type (lower 3 bits).
/// </summary>
public static WireType GetTagWireType(uint tag)
{
return (WireType) (tag & TagTypeMask);
}
/// <summary>
/// Given a tag value, determines the field number (the upper 29 bits).
/// </summary>
public static int GetTagFieldNumber(uint tag)
{
return (int) tag >> TagTypeBits;
}
/// <summary>
/// Makes a tag value given a field number and wire type.
/// </summary>
public static uint MakeTag(int fieldNumber, WireType wireType)
{
return (uint) (fieldNumber << TagTypeBits) | (uint) wireType;
}
}
}
|
