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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion
using System;
namespace Google.Protobuf
{
// This part of CodedOutputStream provides all the static entry points that are used
// by generated code and internally to compute the size of messages prior to being
// written to an instance of CodedOutputStream.
public sealed partial class CodedOutputStream
{
private const int LittleEndian64Size = 8;
private const int LittleEndian32Size = 4;
internal const int DoubleSize = LittleEndian64Size;
internal const int FloatSize = LittleEndian32Size;
internal const int BoolSize = 1;
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// double field, including the tag.
/// </summary>
public static int ComputeDoubleSize(double value)
{
return DoubleSize;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// float field, including the tag.
/// </summary>
public static int ComputeFloatSize(float value)
{
return FloatSize;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// uint64 field, including the tag.
/// </summary>
public static int ComputeUInt64Size(ulong value)
{
return ComputeRawVarint64Size(value);
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// int64 field, including the tag.
/// </summary>
public static int ComputeInt64Size(long value)
{
return ComputeRawVarint64Size((ulong) value);
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// int32 field, including the tag.
/// </summary>
public static int ComputeInt32Size(int value)
{
if (value >= 0)
{
return ComputeRawVarint32Size((uint) value);
}
else
{
// Must sign-extend.
return 10;
}
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// fixed64 field, including the tag.
/// </summary>
public static int ComputeFixed64Size(ulong value)
{
return LittleEndian64Size;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// fixed32 field, including the tag.
/// </summary>
public static int ComputeFixed32Size(uint value)
{
return LittleEndian32Size;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// bool field, including the tag.
/// </summary>
public static int ComputeBoolSize(bool value)
{
return BoolSize;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// string field, including the tag.
/// </summary>
public static int ComputeStringSize(String value)
{
int byteArraySize = WritingPrimitives.Utf8Encoding.GetByteCount(value);
return ComputeLengthSize(byteArraySize) + byteArraySize;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// group field, including the tag.
/// </summary>
public static int ComputeGroupSize(IMessage value)
{
return value.CalculateSize();
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// embedded message field, including the tag.
/// </summary>
public static int ComputeMessageSize(IMessage value)
{
int size = value.CalculateSize();
return ComputeLengthSize(size) + size;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// bytes field, including the tag.
/// </summary>
public static int ComputeBytesSize(ByteString value)
{
return ComputeLengthSize(value.Length) + value.Length;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// uint32 field, including the tag.
/// </summary>
public static int ComputeUInt32Size(uint value)
{
return ComputeRawVarint32Size(value);
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a
/// enum field, including the tag. The caller is responsible for
/// converting the enum value to its numeric value.
/// </summary>
public static int ComputeEnumSize(int value)
{
// Currently just a pass-through, but it's nice to separate it logically.
return ComputeInt32Size(value);
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// sfixed32 field, including the tag.
/// </summary>
public static int ComputeSFixed32Size(int value)
{
return LittleEndian32Size;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// sfixed64 field, including the tag.
/// </summary>
public static int ComputeSFixed64Size(long value)
{
return LittleEndian64Size;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// sint32 field, including the tag.
/// </summary>
public static int ComputeSInt32Size(int value)
{
return ComputeRawVarint32Size(WritingPrimitives.EncodeZigZag32(value));
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// sint64 field, including the tag.
/// </summary>
public static int ComputeSInt64Size(long value)
{
return ComputeRawVarint64Size(WritingPrimitives.EncodeZigZag64(value));
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a length,
/// as written by <see cref="WriteLength"/>.
/// </summary>
public static int ComputeLengthSize(int length)
{
return ComputeRawVarint32Size((uint) length);
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a varint.
/// </summary>
public static int ComputeRawVarint32Size(uint value)
{
if ((value & (0xffffffff << 7)) == 0)
{
return 1;
}
if ((value & (0xffffffff << 14)) == 0)
{
return 2;
}
if ((value & (0xffffffff << 21)) == 0)
{
return 3;
}
if ((value & (0xffffffff << 28)) == 0)
{
return 4;
}
return 5;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a varint.
/// </summary>
public static int ComputeRawVarint64Size(ulong value)
{
if ((value & (0xffffffffffffffffL << 7)) == 0)
{
return 1;
}
if ((value & (0xffffffffffffffffL << 14)) == 0)
{
return 2;
}
if ((value & (0xffffffffffffffffL << 21)) == 0)
{
return 3;
}
if ((value & (0xffffffffffffffffL << 28)) == 0)
{
return 4;
}
if ((value & (0xffffffffffffffffL << 35)) == 0)
{
return 5;
}
if ((value & (0xffffffffffffffffL << 42)) == 0)
{
return 6;
}
if ((value & (0xffffffffffffffffL << 49)) == 0)
{
return 7;
}
if ((value & (0xffffffffffffffffL << 56)) == 0)
{
return 8;
}
if ((value & (0xffffffffffffffffL << 63)) == 0)
{
return 9;
}
return 10;
}
/// <summary>
/// Computes the number of bytes that would be needed to encode a tag.
/// </summary>
public static int ComputeTagSize(int fieldNumber)
{
return ComputeRawVarint32Size(WireFormat.MakeTag(fieldNumber, 0));
}
}
}