public ulong TakeUnsignedBE(out ulong value, uint length)
{
if (CheckAvailable(length))
{
value = BufferIO.BytesToUIntBE(_packetBuffer, _pos, length);
_pos += length;
return(value);
}
throw _bufferErr;
}
public byte[] TakeBytes(out byte[] value, Prefix prefixFlag)
{
uint length;
bool reduce = (prefixFlag & Prefix.WithPrefix) > 0;
uint preLen = ((uint)prefixFlag) & 15;
switch (preLen)
{
case 0: // Read to end.
length = (uint)(_packetLength - _pos);
break;
case 1:
case 2:
case 4:
if (CheckAvailable(preLen))
{
length = (uint)BufferIO.BytesToUIntBE(_packetBuffer, _pos, preLen);
_pos += preLen;
if (reduce)
{
if (length < preLen)
{
throw new IOException("Data length is less than prefix length.");
}
length -= preLen;
}
break;
}
throw _bufferErr;
default:
throw new ArgumentOutOfRangeException("Invalid prefix flag.");
}
if (CheckAvailable(length))
{
value = new byte[length];
Buffer.BlockCopy(_packetBuffer, (int)_pos, value, 0, (int)length);
_pos += length;
return(value);
}
throw _bufferErr;
}
