public int Read(byte *p, int length)
{
var read = 0;
while (read < length)
{
// Read the next block from the underlying stream
if (_decodedBuffer.Offset >= _decodedBuffer.End)
{
_encodedBuffer.Reset();
// Read the payload length
if (_underlying.Read(_encodedBuffer.Data, 0, sizeOfHeader) != sizeOfHeader)
{
return(read); // Ends of stream
}
var payloadLength = ((PayloadHeader *)_encodedBuffer.Ptr)->PayloadLength;
if (_underlying.Read(_encodedBuffer.Data, 0, payloadLength + sizeof(byte)) != payloadLength + sizeof(byte))
{
return(read); // Ends of stream
}
// Decode data
_decodedBuffer.Reset();
_decodedBuffer.End += _codec.Decode(_encodedBuffer.Ptr, payloadLength, (T *)_decodedBuffer.Ptr) * sizeof(T);
// Checksum coherency
if (*(_encodedBuffer.Ptr + payloadLength) != CHECKSUM)
{
throw new CorruptedDataException("Checksum failed");
}
}
var bytesToRead = Math.Min(length - read, (int)(_decodedBuffer.End - _decodedBuffer.Offset));
Unsafe.CopyBlock(p, _decodedBuffer.Offset, (uint)bytesToRead);
read += bytesToRead;
p += bytesToRead;
_decodedBuffer.Offset += bytesToRead;
#if Debug
if ((int)(_blockEnd - _offset) <= remainingBytes)
{
throw new InvalidOperationException($"The codec {typeof(TCodec)} decoded nothing and the read is fallen in an infinity loop");
}
#endif
}
return(read);
}