public Guid ReadGuid()
{
ReadLength();
if (bufferSize - bufferPos >= CodedOutputStream.GuidSize)
{
ReadTag();
ByteArray.Copy(buffer, bufferPos, guidBuffer, 0, 8);
bufferPos += 8;
ReadTag();
ByteArray.Copy(buffer, bufferPos, guidBuffer, 8, 8);
bufferPos += 8;
return(new Guid(guidBuffer));
}
throw InvalidProtocolBufferException.SizeLimitExceeded();
}
/// <summary>
/// Reads a raw varint from the stream.
/// </summary>
internal ulong ReadRawVarint64()
{
int shift = 0;
ulong result = 0;
while (shift < 64)
{
byte b = ReadRawByte();
result |= (ulong)(b & 0x7F) << shift;
if ((b & 0x80) == 0)
{
return(result);
}
shift += 7;
}
throw InvalidProtocolBufferException.MalformedVarint();
}
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 fixed size of bytes from the input.
/// </summary>
/// <exception cref="InvalidProtocolBufferException">
/// the end of the stream or the current limit was reached
/// </exception>
internal byte[] ReadRawBytes(int size)
{
if (size < 0)
{
throw InvalidProtocolBufferException.NegativeSize();
}
if (size > bufferSize - bufferPos)
{
throw InvalidProtocolBufferException.TruncatedMessage();
}
// We have all the bytes we need already.
byte[] bytes = new byte[size];
ByteArray.Copy(buffer, bufferPos, bytes, 0, size);
bufferPos += size;
return(bytes);
}
/// <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());
}
/// <summary>
/// Reads a string field from the stream.
/// </summary>
public string ReadString()
{
int length = ReadLength();
// No need to read any data for an empty string.
if (length == 0)
{
return("");
}
if (length > bufferSize - bufferPos)
{
throw InvalidProtocolBufferException.TruncatedMessage();
}
// Fast path: We already have the bytes in a contiguous buffer, so
// just copy directly from it.
var result = CodedOutputStream.Utf8Encoding.GetString(buffer, bufferPos, length);
bufferPos += length;
return(result);
}
