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Merge branch 'master' of https://github.com/emmanuel-marty/lzsa

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emmanuel-marty 2019-04-08 09:44:19 +02:00
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@ -4,21 +4,22 @@ The LZSA compression tool uses an aggressive optimal packing strategy to try to
Compression ratio comparison between LZSA and other optimal packers, for a workload composed of ZX Spectrum and C64 files:
ZX7 57,36% (entropy coding)
LZ5 1.4.1 59,82%
LZSA 60,84% <------ (single byte stream)
Lizard -29 64,14% (rep-match, 4 byte streams)
LZ4_HC -19 -B4 -BD 64,5% (single byte stream)
Uncompressed 100%
Bytes Ratio Decompression speed vs. LZ4
ZX7 687133 53,30% 47,73%
LZ5 1.4.1 727107 56,40% 75%
LZSA 736539 57,13% <------ 90%
Lizard -29 776122 60,21% Not measured
LZ4_HC -19 -B4 -BD 781049 60,59% 100%
Uncompressed 1289127 100% N/A
Performance over well-known compression corpus files:
Uncompressed LZ4_HC -19 -B4 -BD LZSA
Canterbury 2810784 935827 (33,29%) 855284 (30,43%)
Silesia 211938580 77299725 (36,47%) 73793860 (34,82%)
Calgary 3251493 1248780 (38,40%) 1196809 (36,80%)
Large 11159482 3771025 (33,79%) 3648987 (32,70%)
enwik9 1000000000 371841591 (37,18%) 355427361 (35,54%)
Canterbury 2810784 935827 (33,29%) 855083 (30,42%)
Silesia 211938580 77299725 (36,47%) 73750088 (34,80%)
Calgary 3251493 1248780 (38,40%) 1196507 (36,80%)
Large 11159482 3771025 (33,79%) 3648435 (32,69%)
enwik9 1000000000 371841591 (37,18%) 355369963 (35,54%)
As an example of LZSA's simplicity, a size-optimized decompressor on 8088 has been implemented in 91 bytes.