private uint ReadTagSlow()
{
if (IsAtEnd)
{
return(0);
}
uint tag = ReadRawVarint32();
if (tag == 0)
{
// If we actually read zero, that's not a valid tag.
throw InvalidProtocolBufferException.InvalidTag();
}
return(tag);
}
/// <summary>
/// Reads a field tag, returning the tag of 0 for "end of stream".
/// </summary>
/// <remarks>
/// If this method returns 0, it doesn't necessarily mean the end of all
/// the data in this CodedInputStream; it may be the end of the logical stream
/// for an embedded message, for example.
/// </remarks>
/// <returns>The next field tag, or 0 for end of stream. (0 is never a valid tag.)</returns>
public uint ReadTag()
{
// Optimize for the incredibly common case of having at least one byte left in the buffer,
// and this byte being enough to get the tag. This will be true for fields up to 31.
if (bufferPos + 1 <= bufferSize)
{
uint tag = buffer[bufferPos];
if (tag < 128)
{
bufferPos++;
if (tag == 0)
{
// If we actually read zero, that's not a valid tag.
throw InvalidProtocolBufferException.InvalidTag();
}
return(tag);
}
}
return(ReadTagSlow());
}