| Commit message (Collapse) | Author | Age | Files | Lines |
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following suggestion from @stbrumme (#558)
Also : bumped version number, regenerated man page and html doc
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Add CMake option to not build legacy lz4c program
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fixed spelling mistake in lz4_manual and lz4.h
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Add --fast command to cli
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negative compresion level
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Fix LZ4_compress_fast_continue() docs
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Fixes #549.
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Aix 32bit fuzzer
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Preparing v1.8.2
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allow to override uname when cross-compiling
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When cross-compiling for example from Darwin to Linux it might be
useful to override uname output to force Linux and create Linux
libraries instead of Darwin libraries.
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Add `extern "C"` Guard Around Experimental HC Declarations
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Add Haiku as a validated target.
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lz4 1.8.2 works fine on Haiku and passes all tests.
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Speed optimization for optimal parser
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which measurably improves speed
on levels 9+
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also :
reserved PA for levels 9+ (instead of 8+).
In most cases, speed is lower, and compression benefit is not worth.
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the trade off is not good for regular HC parser :
compression is a little bit better, but speed cost is too large in comparison.
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Only enabled when searching forward.
note : it slighly improves compression ratio,
but measurably decreases speed.
Trade-off to analyse.
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when combining both PA and CS optimizations
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slower than expected
Pattern analyzer and Chain Swapper
work slower when both activated.
Reasons unclear.
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greatly improves speed compared to non-accelerated,
especially for slower files.
On my laptop, -b12 :
```
calgary.tar : 4.3 MB/s => 9.0 MB/s
enwik7 : 10.2 MB/s => 13.3 MB/s
silesia.tar : 4.0 MB/s => 8.7 MB/s
```
Note : this is the simplified version,
without handling dictionaries, external buffer, nor pattern analyzer.
Current `dev` branch on these samples gives :
```
calgary.tar : 4.2 MB/s
enwik7 : 9.7 MB/s
silesia.tar : 3.5 MB/s
```
interestingly, it's slower,
presumably due to handling of dictionaries.
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simplified match finder
only searching forward and within current buffer,
for easier testing of optimizations.
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Fix frametest error
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don't fix dictionaries of size 0.
setting dictEnd == source triggers prefix mode,
thus removing possibility to use CDict.
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The error can be reproduced using following command :
./frametest -v -i100000000 -s1659 -t31096808
It's actually a bug in the stream LZ4 API,
when starting a new stream
and providing a first chunk to complete with size < MINMATCH.
In which case, the chunk becomes a dictionary.
No hash was generated and stored,
but the chunk is accessible as default position 0 points to dictStart,
and position 0 is still within MAX_DISTANCE.
Then, next attempt to read 32-bits from position 0 fails.
The issue would have been mitigated by starting from index 64 KB,
effectively eliminating position 0 as too far away.
The proper fix is to eliminate such "dictionary" as too small.
Which is what this patch does.
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Fix make install
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* Uninstall didn't remove the pkg-config correctly.
* Fix `mandir`
* Allow overriding either upper- or lower-case location variables, but
always use the lower case variables.
* Add test case that ensures overriding both upper- and lower-case
variables is the same, and that the directory is empty after uninstall.
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