GitHub - grtamayo/lzuf62: Lzuf62 works on bigger files > 4GB like enwik10. Optional bitsize for sliding window implemented, WBITS = 12..20, default=17. Lzuf621 with optional bitsize of hash bucket search list (far_list_bits = 1..12), default=9. Lzuf622 and lzuf624 single file coder/decoder.

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Lzuf62 works on bigger files > 4GB like enwik10. Optional bitsize for sliding window implemented, WBITS = 12..20, default=17. Lzuf621 with optional bitsize of hash bucket search list (far_list_bits = 1..12), default=9. Lzuf622 and lzuf624 single file coder/decoder.

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Name		Name	Last commit message	Last commit date
Latest commit History 212 Commits
Readme.txt		Readme.txt
gtbitio2.c		gtbitio2.c
gtbitio2.h		gtbitio2.h
gtbitio3.c		gtbitio3.c
gtbitio3.h		gtbitio3.h
lzhash.c		lzhash.c
lzhash.h		lzhash.h
lzhash2.c		lzhash2.c
lzhash2.h		lzhash2.h
lzuf62.c		lzuf62.c
lzuf62.exe		lzuf62.exe
lzuf621.c		lzuf621.c
lzuf621.exe		lzuf621.exe
lzuf622.c		lzuf622.c
lzuf622.exe		lzuf622.exe
lzuf624.c		lzuf624.c
lzuf624.exe		lzuf624.exe
lzufd62.c		lzufd62.c
lzufd62.exe		lzufd62.exe
lzufd622.c		lzufd622.c
lzufd622.exe		lzufd622.exe
mtf.c		mtf.c
mtf.h		mtf.h
ucodes2.c		ucodes2.c
ucodes2.h		ucodes2.h
ucodes3.c		ucodes3.c
ucodes3.h		ucodes3.h
utypes.h		utypes.h

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Lempel-Ziv algorithms (LZ77/LZSS):

(1)  lzuf62.c and lzufd62.c [works on bigger files, optional sliding window size];
(2)  lzuf621.c [optional hash bucket search list size];
(3)  lzuf622.c [single file coder/decoder]:

In my tests, "lzuf622 -c17 -f2" is a little better than LZ4 high compression ("lz4 -9") in compression ratio at about the same compression speed on enwik8 and enwik9. That's testing only the 4 most recent offsets of the same hash. "Lzop -1" and "lzop -9" are better than "lz4 -1" and "lz4 -9" respectively but "lzop -9" is slower. "Lzuf622 -c17 -f3" is better than "lzop -9" but both lz4 and lzop decode way faster. Lzuf624 "-c17 -f3" is better than "lz4 -9" and lzuf624 "-c18 -f3" is better than "lzop -9". Lzuf624 decodes faster than lzuf622.

Notes:

For personal, academic, and research purposes only. Freely distributable.

Gerald Tamayo, BSIE (Mapua I.T.)
Philippines