A single-class pure VB6 library for zip with ASM speed
Faster vectorized crc32 calculation and lots of other micro performance optimizations.
cZipArchive and vbzip.exe now support compression levels 0 through 9 where 0 means no compression (store uncompressed files), 1 to 4 use greedy LZ77, and 5 to 9 use a better (and slower) lazy algorithm.