Yann Collet
a146ee04ae
added negative compression levels
...
negative compression level trade compression ratio for more compression speed.
They turn off huffman compression of literals,
and use row 0 as baseline with a stepSize = -cLevel.
added associated test in fuzzer
also added : new advanced parameter ZSTD_p_literalCompression
2018-03-11 05:21:53 -07:00
Nick Terrell
7e5e226cbf
Split the window state into substructure
2018-02-26 13:29:57 -08:00
Yann Collet
5188749e1c
ensure compression parameters are updated when only compression level is changed
2018-02-02 16:31:20 -08:00
Nick Terrell
887cd4e35e
Split ZSTD_CCtx into smaller sub-structures
2018-01-16 11:17:50 -08:00
Nick Terrell
9a211d1f05
Load more dictionary positions into table if empty
...
If the hash table is empty load positions into the hash table
that we would otherwise skip.
| Level | Data Set | Improvement |
|-------|--------------|-------------|
| 1 | github | 0.44% |
| 1 | hg-changelog | 0.13% |
| 1 | hg-commands | 1.28% |
| 1 | hg-manifest | 0.70% |
| 3 | github | 0.74% |
| 3 | hg-changelog | 0.87% |
| 3 | hg-commands | 1.74% |
| 3 | hg-manifest | 0.23% |
2018-01-12 16:17:22 -08:00
Yann Collet
ee441d5d2b
renamed zstd_compress.h into zstd_compress_internal.h
...
to emphasize the fact that all definitions it contains
must remain private, accross lib/compress modules.
2017-11-07 16:15:23 -08:00
Stella Lau
eb3327c10a
Merge branch 'dev' of https://github.com/facebook/zstd into ldm-mergeDev
2017-09-11 15:00:01 -07:00
Yann Collet
3128e03be6
updated license header
...
to clarify dual-license meaning as "or"
2017-09-08 00:09:23 -07:00
Stella Lau
eeff55dfa8
Merge remote-tracking branch 'upstream/dev' into ldm-mergeDev
2017-09-06 15:56:32 -07:00
Nick Terrell
721726d688
Split parsers out of zstd_compress.c
2017-09-05 17:10:25 -07:00
