81 lines
2.6 KiB
C#
81 lines
2.6 KiB
C#
#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#endregion
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namespace Google.Protobuf
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{
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/// <summary>
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/// This class is used internally by the Protocol Buffer Library and generated
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/// message implementations. It is public only for the sake of those generated
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/// messages. Others should not use this class directly.
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/// <para>
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/// This class contains constants and helper functions useful for dealing with
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/// the Protocol Buffer wire format.
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/// </para>
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/// </summary>
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public static class WireFormat
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{
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/// <summary>
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/// Wire types within protobuf encoding.
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/// </summary>
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public enum WireType : uint
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{
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/// <summary>
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/// Variable-length integer.
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/// </summary>
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Varint = 0,
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/// <summary>
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/// A fixed-length 64-bit value.
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/// </summary>
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Fixed64 = 1,
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/// <summary>
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/// A length-delimited value, i.e. a length followed by that many bytes of data.
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/// </summary>
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LengthDelimited = 2,
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/// <summary>
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/// A "start group" value
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/// </summary>
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StartGroup = 3,
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/// <summary>
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/// An "end group" value
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/// </summary>
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EndGroup = 4,
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/// <summary>
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/// A fixed-length 32-bit value.
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/// </summary>
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Fixed32 = 5
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}
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private const int TagTypeBits = 3;
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private const uint TagTypeMask = (1 << TagTypeBits) - 1;
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/// <summary>
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/// Given a tag value, determines the wire type (lower 3 bits).
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/// </summary>
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public static WireType GetTagWireType(uint tag)
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{
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return (WireType) (tag & TagTypeMask);
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}
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/// <summary>
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/// Given a tag value, determines the field number (the upper 29 bits).
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/// </summary>
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public static int GetTagFieldNumber(uint tag)
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{
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return (int) (tag >> TagTypeBits);
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}
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/// <summary>
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/// Makes a tag value given a field number and wire type.
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/// </summary>
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public static uint MakeTag(int fieldNumber, WireType wireType)
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{
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return (uint) (fieldNumber << TagTypeBits) | (uint) wireType;
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}
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}
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} |