Finally, the universal HSQ / SQX decompressor is done! Big thanks goes to -=CHE@TER=- who helped a lot with disassembling the original unpacker code from KGB game :keke: https://www.extractor.ru/ipb/index.php?showtopic=8767 I converted disassembly to Delphi code, and now it works excellent! Attached...

I've implemented a decompression program, however the SQX-1 algorithm is still not finished.
The decompressed data at first looks good, but only for few bytes.

Attached a program source with test files (compressed and decompressed - ripped from game memory, running in DOSBox).

Value at offset 5 specifies how many bits are used in counter. Examples: val = 3: 3 bits for count, 13 bits for offset val = 4: 4 bits for count, 12 bits for offset etc. In SQX-0 algorithm the first bit is checked for zero. Other logic is same as HSQ except variable bits for count/offset. SQX-1 has ...

Also one interesting thing, according to the game files, there are different types of SQX depending on byte at offset 3.

Default queue bits are:
HSQ: 0xFF
SQX-0: 0x00
SQX-1: 0x55
SQX-2: 0xFF

* Both formats have a six byte header, however SQX's is different. * HSQ uses a checksum of 0xAB, which is calculated by adding the first six bytes of the header, to perform decompression. From what it looks like, SQX doesn't use a checksum. * Both formats use at least 18-byte chunks, a two-byte he...