greg/pcompress
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310 commits 3 branches 21 tags 7.6 MiB
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23 commits

Author SHA1 Message Date
Moinak Ghosh
75dfa6a6fb Add basic framework for file type based filters during libarchive stage. 
Add packJPG filter for Jpeg files (not active yet).
Directory format changes for clarity.
 2013-11-10 23:09:42 +05:30
Moinak Ghosh
8c1f4ebe61 Add a simple log facility. 
Refactor all printfs to use log facility.
 2013-10-02 20:45:33 +05:30
Moinak Ghosh
fa78621cbf Cleanup pointer casting in code to use macros. 2013-09-22 20:11:15 +05:30
Moinak Ghosh
f8f23e5200 Major License text cleanup. 2013-03-07 20:26:48 +05:30
Moinak Ghosh
3888c8d316 Many optimization tweaks 
Optimize Rabin Deduplication and Bsdiff
Vectorize XXHash using SE4
 2013-01-20 22:02:26 +05:30
Moinak Ghosh
47ebd5b752 Fix calculation of extra scratch space for Dedupe. 
Add missing return value check in small buffer Delta2.
Update test failure detection in test driver.
 2013-01-03 22:25:14 +05:30
Moinak Ghosh
6b756eb165 Fix Delta2 handling for small buffers. 
Fix LZP handling during preprocessing.
Fix type flag handling during preprocessing.
Update test cases to use configurable list of test corpus files.
Update some more int64_t datatypes to uint64_t
Add a gitignore.
 2013-01-02 22:56:21 +05:30
Moinak Ghosh
43f5acfa2d Add more comments to code. 2012-12-31 23:27:31 +05:30
Moinak Ghosh
36d95276ee Further improvements to Delta2 performance. 
Fix the byteswap macros.
Start adding assertions.
 2012-12-28 22:12:38 +05:30
Moinak Ghosh
26a4f42506 Introduce strict compiler flags and fix scores of warnings/issues. 
Avoid different optimization flags for Dedupe sources.
Fix liberal mixing of uint64_t and int64_t (should all be uint64_t).
Fix corner case crash when decompressing.
 2012-12-27 23:06:48 +05:30
Moinak Ghosh
063624d0d3 Fix Delta2 decode handling when not compressing. 
More debug statements and other minor changes.
 2012-12-24 23:21:02 +05:30
Moinak Ghosh
d597f0f05c Major enhancements to Delta2 encoding. 
Avoid transposing below-threshold spans. Reduces compression ratio.
Use little-endian storage format for numbers to optimize for x86.
Improve embedded table detection.
Reduce header sizes.
Get rid of Gcc's LTO flag. Causes a performance drop.
Fix preprocessing behavior when LZP does not compress but Delta2 works.
 2012-12-23 23:50:45 +05:30
Moinak Ghosh
a43fdd7d2c Improve Delta2 scanning speed and effectiveness. 
Add destination buffer overflow check in Delta2.
Add rough speed computation.
 2012-12-23 00:44:56 +05:30
Moinak Ghosh
765b014018 More tweaks to Delta2 implementation. 2012-12-21 22:58:30 +05:30
Moinak Ghosh
9bd8146e88 Improve Delta2 performance. 2012-12-20 23:49:44 +05:30
Moinak Ghosh
e9c3b34ff5 Add debug build verbose messages to delta code. 2012-12-19 22:42:55 +05:30
Moinak Ghosh
c2df666daf Major improvement to Delta2 encoding algorithm. 2012-12-18 23:32:55 +05:30
Moinak Ghosh
fb30b5c295 Enable building with alternate Zlib and Bzlib. 
Update README and comments.
Fix correct setting of output size when using Delta2 without LZP.
 2012-12-16 23:17:04 +05:30
Moinak Ghosh
ef0191729e Make Delta2 encoding independent of LZP. 
Tweak Delta2 parameters.
Update README and test cases.
 2012-12-15 22:03:23 +05:30
Moinak Ghosh
a98778d62f Fine tune transpose parameters. 
Fix minor nits.
 2012-12-14 19:12:48 +05:30
Moinak Ghosh
b0f41c2888 Add matrix transpose to Delta2 encoding. 
Change confusing structure member name.
 2012-12-13 21:18:16 +05:30
Moinak Ghosh
224fb529e9 Get rid of size_t in places where 64-bitness is assumed. 2012-12-09 10:15:06 +05:30
Moinak Ghosh
51249c858d Work in progress Adaptive Delta Encoding. 2012-12-03 23:45:41 +05:30