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3246 Commits

Author SHA1 Message Date
W. Felix Handte
4a0572b215 Refactor Huffman Decompression Away From Ternary Tree in ZSTD_decodeLiteralsBlock 2018-12-18 13:36:39 -08:00
W. Felix Handte
432314b58a Rename HUF_DECOMPRESS_MINIMAL -> HUF_FORCE_DECOMPRESS_X1 2018-12-18 13:36:39 -08:00
W. Felix Handte
4bbb8a48ad Add ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG 
This macro forces behavior in the opposite direction.
 2018-12-18 13:36:39 -08:00
W. Felix Handte
64553a0e35 Rename ZSTD_DECOMPRESS_MINIMAL -> ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT 2018-12-18 13:36:39 -08:00
W. Felix Handte
605dd576ee Remove Error Strings with ZSTD_STRIP_ERROR_STRINGS 2018-12-18 13:36:39 -08:00
W. Felix Handte
9d5f3963ff Add Option to Not Request Inlining with ZSTD_NO_INLINE 2018-12-18 13:36:39 -08:00
W. Felix Handte
df28e5babd Add ZSTD_DECOMPRESS_MINIMAL Macro, Which Reduces Branching of Decompress Variants 2018-12-18 13:36:39 -08:00
W. Felix Handte
f45c9df42e Totally Hide/Disable X2 Variants when HUF_DECOMPRESS_MINIMAL is Defined 2018-12-18 13:36:39 -08:00
W. Felix Handte
36a84b07a8 Load Dictionaries as X1 Tables 2018-12-18 13:36:39 -08:00
W. Felix Handte
f9cb348776 Add HUF_DECOMPRESS_MINIMAL Macro, Which Avoids Using X2 Variants 2018-12-18 13:36:39 -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
517d8c984c
Merge pull request #1449 from facebook/ovlog_def 
overlapLog default values
 2018-12-18 09:45:53 -08:00
Yann Collet
373ff8b983 play around with rescale weights 2018-12-17 15:48:34 -08:00
Yann Collet
8be145a8c1 fixed default job size 2018-12-13 16:38:08 -08:00
Nick Terrell
75fa3f2eb7
Merge pull request #1446 from terrelln/overflow 
[libzstd] Fix infinite loop in decompression
 2018-12-13 16:21:15 -08:00
Yann Collet
62180b27d5 zstdmt parameter getter/setter use int 2018-12-13 15:47:34 -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 Collet
34f01e600f fixed multiple conversions 
from 64-bit to 32-bit
 2018-12-13 14:02:22 -08:00
Yann Collet
1993f5d412 fixed ovlog tests 
and updated man page
 2018-12-12 21:09:14 -08:00
Yann Collet
f2f86d369b Merge branch 'btultra2' into ovlog_def 2018-12-12 20:58:14 -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
Yann Collet
7bb8dfc62f new overlapLog default values 
varies between 6 and 9, depending on strategy
 2018-12-11 18:10:29 -08:00
Yann Collet
eee789b7ea continued: changed to overlapLog 
in deeper code layer.
for consistency.
 2018-12-11 17:41:42 -08:00
Yann Collet
9b784dec7f changed parameter name to ZSTD_c_overlapLog 
from overlapSizeLog.

Reasoning :
`overlapLog` is already used everwhere, in the code, command line and documentation.
`ZSTD_c_overlapSizeLog` feels unnecessarily different.
 2018-12-11 16:55:33 -08:00
Yann Collet
52b94f902c add clarification for ZSTD_CCtx_setPledgedSrcSize() 
as requested in #1391
 2018-12-11 12:08:21 -08:00
Yann Collet
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
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
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 Collet
be9e561da4 changed ZSTD_c_compressionStrategy into ZSTD_c_strategy 
also : fixed paramgrill, and limit conditions
 2018-12-06 15:00:52 -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
Yann Collet
4b5a4f02d7 write the switch()case: differently 
so that it please both
compilers which warn for dead code after the switch
and
compilers which do not detect that all branches terminate.
 2018-12-04 16:59:26 -08:00
Yann Collet
85b02bf142 fixed silent conversion warning 2018-12-04 15:57:16 -08:00