308 lines
10 KiB
C#
308 lines
10 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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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System;
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namespace LC.Google.Protobuf
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{
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// This part of CodedOutputStream provides all the static entry points that are used
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// by generated code and internally to compute the size of messages prior to being
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// written to an instance of CodedOutputStream.
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public sealed partial class CodedOutputStream
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{
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private const int LittleEndian64Size = 8;
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private const int LittleEndian32Size = 4;
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internal const int DoubleSize = LittleEndian64Size;
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internal const int FloatSize = LittleEndian32Size;
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internal const int BoolSize = 1;
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// double field, including the tag.
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/// </summary>
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public static int ComputeDoubleSize(double value)
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{
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return DoubleSize;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// float field, including the tag.
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/// </summary>
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public static int ComputeFloatSize(float value)
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{
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return FloatSize;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// uint64 field, including the tag.
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/// </summary>
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public static int ComputeUInt64Size(ulong value)
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{
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return ComputeRawVarint64Size(value);
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// int64 field, including the tag.
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/// </summary>
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public static int ComputeInt64Size(long value)
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{
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return ComputeRawVarint64Size((ulong) value);
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// int32 field, including the tag.
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/// </summary>
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public static int ComputeInt32Size(int value)
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{
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if (value >= 0)
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{
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return ComputeRawVarint32Size((uint) value);
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}
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else
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{
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// Must sign-extend.
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return 10;
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}
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// fixed64 field, including the tag.
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/// </summary>
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public static int ComputeFixed64Size(ulong value)
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{
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return LittleEndian64Size;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// fixed32 field, including the tag.
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/// </summary>
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public static int ComputeFixed32Size(uint value)
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{
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return LittleEndian32Size;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// bool field, including the tag.
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/// </summary>
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public static int ComputeBoolSize(bool value)
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{
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return BoolSize;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// string field, including the tag.
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/// </summary>
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public static int ComputeStringSize(String value)
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{
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int byteArraySize = WritingPrimitives.Utf8Encoding.GetByteCount(value);
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return ComputeLengthSize(byteArraySize) + byteArraySize;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// group field, including the tag.
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/// </summary>
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public static int ComputeGroupSize(IMessage value)
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{
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return value.CalculateSize();
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// embedded message field, including the tag.
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/// </summary>
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public static int ComputeMessageSize(IMessage value)
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{
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int size = value.CalculateSize();
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return ComputeLengthSize(size) + size;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// bytes field, including the tag.
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/// </summary>
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public static int ComputeBytesSize(ByteString value)
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{
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return ComputeLengthSize(value.Length) + value.Length;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// uint32 field, including the tag.
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/// </summary>
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public static int ComputeUInt32Size(uint value)
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{
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return ComputeRawVarint32Size(value);
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a
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/// enum field, including the tag. The caller is responsible for
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/// converting the enum value to its numeric value.
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/// </summary>
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public static int ComputeEnumSize(int value)
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{
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// Currently just a pass-through, but it's nice to separate it logically.
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return ComputeInt32Size(value);
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// sfixed32 field, including the tag.
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/// </summary>
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public static int ComputeSFixed32Size(int value)
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{
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return LittleEndian32Size;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// sfixed64 field, including the tag.
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/// </summary>
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public static int ComputeSFixed64Size(long value)
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{
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return LittleEndian64Size;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// sint32 field, including the tag.
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/// </summary>
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public static int ComputeSInt32Size(int value)
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{
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return ComputeRawVarint32Size(WritingPrimitives.EncodeZigZag32(value));
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode an
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/// sint64 field, including the tag.
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/// </summary>
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public static int ComputeSInt64Size(long value)
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{
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return ComputeRawVarint64Size(WritingPrimitives.EncodeZigZag64(value));
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a length,
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/// as written by <see cref="WriteLength"/>.
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/// </summary>
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public static int ComputeLengthSize(int length)
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{
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return ComputeRawVarint32Size((uint) length);
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a varint.
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/// </summary>
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public static int ComputeRawVarint32Size(uint value)
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{
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if ((value & (0xffffffff << 7)) == 0)
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{
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return 1;
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}
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if ((value & (0xffffffff << 14)) == 0)
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{
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return 2;
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}
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if ((value & (0xffffffff << 21)) == 0)
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{
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return 3;
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}
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if ((value & (0xffffffff << 28)) == 0)
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{
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return 4;
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}
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return 5;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a varint.
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/// </summary>
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public static int ComputeRawVarint64Size(ulong value)
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{
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if ((value & (0xffffffffffffffffL << 7)) == 0)
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{
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return 1;
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}
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if ((value & (0xffffffffffffffffL << 14)) == 0)
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{
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return 2;
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}
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if ((value & (0xffffffffffffffffL << 21)) == 0)
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{
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return 3;
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}
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if ((value & (0xffffffffffffffffL << 28)) == 0)
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{
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return 4;
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}
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if ((value & (0xffffffffffffffffL << 35)) == 0)
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{
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return 5;
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}
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if ((value & (0xffffffffffffffffL << 42)) == 0)
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{
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return 6;
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}
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if ((value & (0xffffffffffffffffL << 49)) == 0)
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{
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return 7;
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}
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if ((value & (0xffffffffffffffffL << 56)) == 0)
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{
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return 8;
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}
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if ((value & (0xffffffffffffffffL << 63)) == 0)
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{
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return 9;
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}
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return 10;
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}
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/// <summary>
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/// Computes the number of bytes that would be needed to encode a tag.
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/// </summary>
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public static int ComputeTagSize(int fieldNumber)
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{
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return ComputeRawVarint32Size(WireFormat.MakeTag(fieldNumber, 0));
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}
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}
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} |