bt_compressed
lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
cBlockHeader = lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
U32 const cBlockHeader24 = lastBlock + (((U32)bt_compressed)<<1) + (U32)(cSize << 3);
case bt_compressed:
case bt_compressed: