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Author SHA1 Message Date
Yann Collet ef984e7307 fix debug levels 
as reported by @terrelln.
2 is reserved for temporary usage only.
 2018-12-18 13:40:07 -08:00
Yann Collet 635783da12 btultra2 and very small srcSize 
When srcSize is small,
the nb of symbols produced is likely too small to warrant dedicated probability tables.
In which case, predefined distribution tables will be used instead.

There is a cheap algorithm in btultra initialization :
it presumes default distribution will be used if srcSize <= 1024.

btultra2 now uses the same threshold to shut down probability estimation,
since measured frequencies won't be used at entropy stage,
and therefore relying on them to determine sequence cost is misleading,
resulting in worse compression ratios.

This fixes btultra2 performance issue on very small input.

Note that, a proper way should be
to determine which symbol is going to use predefined probaility
and which symbol is going to use dynamic ones.
But the current algorithm is unable to make a "per-symbol" decision.
So this will require significant modifications.
 2018-12-18 12:32:58 -08:00
Yann Collet 373ff8b983 play around with rescale weights 2018-12-17 15:48:34 -08:00
Yann ColletandGitHub d4698424ce Merge pull request #1447 from lzutao/meson_symlink_soversion 
meson: More accurate Windows build support
 2018-12-14 09:18:37 -08:00
Nick TerrellandGitHub 75fa3f2eb7 Merge pull request #1446 from terrelln/overflow 
[libzstd] Fix infinite loop in decompression
 2018-12-13 16:21:15 -08:00
Nick Terrell aaea4ef924 [libzstd] Fix infinite loop in decompression 
When we switched `ZSTD_SKIPPABLEHEADERSIZE` to a macro, the places where we do:

    MEM_readLE32(ptr) + ZSTD_SKIPPABLEHEADERSIZE

can now overflow `(unsigned)-8` to `0` and we infinite loop. We now check
the frame size and reject sizes that overflow a U32.

Note that this bug never made it into a release, and was only in the dev branch
for a few days.

Credit to OSS-Fuzz
 2018-12-13 15:13:19 -08:00
Yann ColletandGitHub 4acf139e9f Merge pull request #1448 from lzutao/travis_reformat 
travis: Use script instead of Cmd env
 2018-12-13 12:04:10 -08:00
Lzu Tao b3be899469 travis: Use script instead of Cmd env 2018-12-14 02:06:14 +07:00
Lzu Tao 3ee5504fb2 Simplify logic by setting default value for MESON_INSTALL_DESTDIR_PREFIX 2018-12-13 18:07:01 +07:00
Lzu Tao ce22f76668 meson: Update man1 extension on meson 0.49.0 2018-12-13 14:58:17 +07:00
Lzu Tao abfde03cb5 meson: Update meson symlink script usage 2018-12-13 14:58:17 +07:00
Lzu Tao fa2fc274fd meson: Correct support for building on Windows 
Let soversion base on version if not set. For example, if version is 3.6.0
and soversion is not defined, it is set to 3.
 2018-12-13 14:58:17 +07:00
Lzu Tao 67babb6d23 Replace many os.path methods with pathlib one's 
Use MESON_INSTALL_DESTDIR_PREFIX variable instead of DESTDIR.
 2018-12-13 14:58:17 +07:00
Yann ColletandGitHub fbcae274a4 Merge pull request #1444 from facebook/btultra2 
btultra2
 2018-12-12 21:09:01 -08:00
Yann Collet 9a92ed401d updated compression results.csv 
and fixed nit
 2018-12-12 20:30:09 -08:00
Yann Collet 9792acda3b Merge branch 'dev' into btultra2 2018-12-12 20:18:27 -08:00
Nick TerrellandGitHub 54ca4b3c5d Merge pull request #1445 from terrelln/regression 
[regression] add more methods
 2018-12-12 11:16:54 -08:00
Nick Terrell 8c99e311cf Reset the cctx for documentation/safety 2018-12-11 15:57:56 -08:00
Nick Terrell fcfea057a1 [regression] add more methods 2018-12-11 13:10:22 -08:00
Yann Collet 52b94f902c add clarification for ZSTD_CCtx_setPledgedSrcSize() 
as requested in #1391
 2018-12-11 12:08:21 -08:00
Yann ColletandGitHub 9c3265a53f Merge pull request #1417 from facebook/advancedAPI 
Advanced API
 2018-12-10 18:48:15 -08:00
Yann Collet 5e6aaa3abb fixed btultra2 usage with prefix 
notably while using multi-threading
 2018-12-10 18:45:03 -08:00
Yann Collet 3619c34399 fix assert position within ZSTD_compress2() 2018-12-10 17:42:35 -08:00
Yann Collet 5a1e01e5f1 clarified experimentalParam 2018-12-10 17:36:20 -08:00
Yann Collet c226a7b9f3 fixed ZSTD_compress2() 
as suggested by @terrelln
 2018-12-10 17:33:49 -08:00
Yann Collet ea441ee4ae make test can accept DEBUGLEVEL argument 2018-12-09 23:20:51 -08:00
Yann Collet 37e314a68d updated clevel table for large inputs 2018-12-09 22:38:05 -08:00
Yann Collet c9c4c7ec8c update clevel table for 256K 2018-12-08 21:40:08 -08:00
Yann Collet 8075d75f9c update clevel table for 128K 2018-12-08 10:42:55 -08:00
Yann Collet 95b152ab33 updated clevel table for 16K 
to introduce btultra2
 2018-12-07 20:12:43 -08:00
Yann Collet b71bfb6cf2 paramgrill: add status line 
get information on which config is currently tested
so that console get animated during long tests.
 2018-12-07 16:02:24 -08:00
Yann Collet 27b253fadc added tests for strategy=9 (btultra2) 2018-12-07 14:20:54 -08:00
Yann Collet e68c2d86e7 refactor paramgrill for clarity 
restored ability to copy/paste the resulting compression level table into zstd_compress.c .
 2018-12-07 14:07:54 -08:00
Yann ColletandGitHub 438eb258ae Merge pull request #1440 from hungptit/dev 
Refactor examples to avoid code duplication.
 2018-12-06 20:56:19 -08:00
Hung Dang 0f52b0caad Refactor examples to avoid code duplication. 2018-12-06 22:42:19 -05:00
Yann Collet d613fd9afe linked btultra2 as strategy9 
and ensure zstdbench detects out-of-bound parameters
 2018-12-06 19:27:37 -08:00
Yann Collet 34aa401afd updated documentation 
introducing ZSTD_btultra2
 2018-12-06 17:22:19 -08:00
Yann Collet ae370b0e12 minor bound refinements 2018-12-06 16:51:17 -08:00
Yann Collet 39e28982cf introduced constants ZSTD_STRATEGY_MIN and ZSTD_STRATEGY_MAX 2018-12-06 16:16:16 -08:00
Yann Collet c3c3488981 fixed c++ assignment to enum 2018-12-06 15:57:55 -08:00
Yann ColletandGitHub 9f99ffc51b Merge pull request #1439 from obelisk/buck_readme 
Add buck build instructions to README.md
 2018-12-06 15:42:33 -08:00
Yann Collet be9e561da4 changed ZSTD_c_compressionStrategy into ZSTD_c_strategy 
also : fixed paramgrill, and limit conditions
 2018-12-06 15:00:52 -08:00
Mitchell Grenier f67da61281 Add buck build instruction to the readme 2018-12-06 14:49:17 -08:00
Yann Collet e9448cdf4c introduced strategy btultra2 
note : not yet applied on any compression level
 2018-12-06 13:38:09 -08:00
Yann Collet 0c404a48f0 moved ZSTD_WINDOWLOG_LIMIT_DEFAULT into static-linking-only area 2018-12-06 10:57:19 -08:00
Yann Collet 96d887429b clarified usage of word "job" 
only applies in MT / async context now.
 2018-12-06 10:14:34 -08:00
Yann Collet 3583d19c4e changed parameter names from ZSTD_p_* to ZSTD_c_* 
for naming consistency
 2018-12-05 17:26:02 -08:00
Yann Collet c2053310e5 updated API documentation 2018-12-05 16:23:00 -08:00
Yann Collet 3e042d5cc0 ZSTD_decompressDCtx() is compatible with sticky parameters 2018-12-04 17:30:58 -08:00
Yann Collet d7da3fc90a merge dedicated dParam setters 2018-12-04 17:06:48 -08:00