11 Commits

Author	SHA1	Message	Date
Nick Terrell	295ab0dbfa	Only load extra table positions for CDicts ... Zstdmt uses prefixes to load the overlap between segments. Loading extra positions makes compression non-deterministic, depending on the previous job the context was used for. Since loading extra position takes extra time as well, only do it when creating a `ZSTD_CDict`. Fixes #1077.	2018-04-02 14:41:30 -07:00
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