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using System;
using System.Collections.Generic;
using System.Text;
namespace Google.ProtocolBuffers {
public class WireFormat {
public enum WireType : uint {
Varint = 0,
Fixed64 = 1,
LengthDelimited = 2,
StartGroup = 3,
EndGroup = 4,
Fixed32 = 5
}
internal class MessageSetField {
internal const int Item = 1;
internal const int TypeID = 2;
internal const int Message = 3;
}
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 uint GetTagFieldNumber(uint tag) {
return 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;
}
}
}
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