static ulong ReadFirstByteData(ref BitSource source, byte headerLen, byte noContBits, byte preHeaderCapacity)
{
bool isExtended = preHeaderCapacity < 4;
ulong res = 0;
// For an extended first byte (yyy-xxxxxxxx)
if (isExtended)
{
// If there are still "y" bits left, get them.
if (headerLen < preHeaderCapacity)
{
res = (ulong)source.ReadInteger(source.FreeBits) << noContBits << 8;
}
// Make sure we're ready to read "x"s. There will always be "x"es as the header can not physically take them all up.
if (source.FreeBits == 0)
{
source.MoveToNewByte();
}
}
return(res | ((ulong)source.ReadInteger(source.FreeBits) << noContBits));
}