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| 1 #region Copyright notice and license | |
| 2 // Protocol Buffers - Google's data interchange format | |
| 3 // Copyright 2008 Google Inc. All rights reserved. | |
| 4 // https://developers.google.com/protocol-buffers/ | |
| 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 // * Neither the name of Google Inc. nor the names of its | |
| 17 // contributors may be used to endorse or promote products derived from | |
| 18 // this software without specific prior written permission. | |
| 19 // | |
| 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 #endregion | |
| 32 | |
| 33 namespace Google.Protobuf | |
| 34 { | |
| 35 /// <summary> | |
| 36 /// This class is used internally by the Protocol Buffer Library and generat
ed | |
| 37 /// message implementations. It is public only for the sake of those generat
ed | |
| 38 /// messages. Others should not use this class directly. | |
| 39 /// <para> | |
| 40 /// This class contains constants and helper functions useful for dealing wi
th | |
| 41 /// the Protocol Buffer wire format. | |
| 42 /// </para> | |
| 43 /// </summary> | |
| 44 public static class WireFormat | |
| 45 { | |
| 46 /// <summary> | |
| 47 /// Wire types within protobuf encoding. | |
| 48 /// </summary> | |
| 49 public enum WireType : uint | |
| 50 { | |
| 51 /// <summary> | |
| 52 /// Variable-length integer. | |
| 53 /// </summary> | |
| 54 Varint = 0, | |
| 55 /// <summary> | |
| 56 /// A fixed-length 64-bit value. | |
| 57 /// </summary> | |
| 58 Fixed64 = 1, | |
| 59 /// <summary> | |
| 60 /// A length-delimited value, i.e. a length followed by that many by
tes of data. | |
| 61 /// </summary> | |
| 62 LengthDelimited = 2, | |
| 63 /// <summary> | |
| 64 /// A "start group" value - not supported by this implementation. | |
| 65 /// </summary> | |
| 66 StartGroup = 3, | |
| 67 /// <summary> | |
| 68 /// An "end group" value - not supported by this implementation. | |
| 69 /// </summary> | |
| 70 EndGroup = 4, | |
| 71 /// <summary> | |
| 72 /// A fixed-length 32-bit value. | |
| 73 /// </summary> | |
| 74 Fixed32 = 5 | |
| 75 } | |
| 76 | |
| 77 private const int TagTypeBits = 3; | |
| 78 private const uint TagTypeMask = (1 << TagTypeBits) - 1; | |
| 79 | |
| 80 /// <summary> | |
| 81 /// Given a tag value, determines the wire type (lower 3 bits). | |
| 82 /// </summary> | |
| 83 public static WireType GetTagWireType(uint tag) | |
| 84 { | |
| 85 return (WireType) (tag & TagTypeMask); | |
| 86 } | |
| 87 | |
| 88 /// <summary> | |
| 89 /// Given a tag value, determines the field number (the upper 29 bits). | |
| 90 /// </summary> | |
| 91 public static int GetTagFieldNumber(uint tag) | |
| 92 { | |
| 93 return (int) tag >> TagTypeBits; | |
| 94 } | |
| 95 | |
| 96 /// <summary> | |
| 97 /// Makes a tag value given a field number and wire type. | |
| 98 /// </summary> | |
| 99 public static uint MakeTag(int fieldNumber, WireType wireType) | |
| 100 { | |
| 101 return (uint) (fieldNumber << TagTypeBits) | (uint) wireType; | |
| 102 } | |
| 103 } | |
| 104 } | |
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Chromium Code Reviews
Issue 1322483002:
Revert https://codereview.chromium.org/1291903002 (protobuf roll). (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master