> HolyLich wrote: > > ChangeLog: > > Fix rather unusual bug in LZ77 decompressor. We cannot use memcpy > > with overlapped areas because of unpredictable result. We must copy > > byte-by-byte. > Why don't you use memmove instead? The man page for memcpy says: > Use memmove(3) if the memory areas do overlap.
We cannot use memmove. It provides different functionality. It moves blocks, but LZ77 decompress algorithm copies bytes. Let's suppose: 012 XYZ When we say 'memmove(1, 0, 2)' we will get: 012 XXY But we (LZ77 algorithm) expect: 012 XXX (three 'X'). memcpy is rather clever (it optmizes process by coping INT instead of BYTES). This optimization is fatal for LZ77. For more information, please, refer to patch. It contains some useful comment. --HolyLich
