greg/pcompress
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25 commits

Author SHA1 Message Date
Moinak Ghosh
d5ceda559e Update Licensing notes and build notes. 
More whitespace fixes.
 2014-07-26 15:28:40 +05:30
Moinak Ghosh
6fba8aa8ac More OSX compatibility code. 
Fix new warnings with Gcc 4.8.
 2014-04-28 00:12:51 +05:30
Moinak Ghosh
a022a958c3 Free PPMD buffer after compression, rather than caching. 
Introduce new API in allocator to release buffer to OS.
Release LZMA buffers after use.
 2013-12-21 23:32:27 +05:30
Moinak Ghosh
a741f34f78 Move MSDOS COM single-byte magic number checks to last in the list. 
Move advanced options flag into context structure.
Include dtd files as text type.
 2013-12-18 00:09:32 +05:30
Moinak Ghosh
6aacd903ff Structured handling of file types. 
Handling of already compressed data based on compression algorithm.
Add a few more extension types.
 2013-11-09 16:46:19 +05:30
Moinak Ghosh
cae9de9b2e Leverage file type detection(archiver) to improve compression performance. 
Use detected file/data type(archiver) for Adaptive compression modes.
Update type flags and add more extensions.
 2013-11-08 23:50:28 +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
f8f23e5200 Major License text cleanup. 2013-03-07 20:26:48 +05:30
Moinak Ghosh
39dbc4be43 Implement algo-specific minimum distance match for Delta Compression. 2013-01-14 13:20:07 +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
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
29b0d8fd7b Implement Adaptive Delta Encoding. 2012-12-05 00:09:47 +05:30
Moinak Ghosh
d054e0f713 Zlib optimizations. Use raw deflate streams to avoid unnecessary adler32. 
Change some function signatures to improve algo init function behavior.
Fix corner case dedupe bug in error handling flow.
Bump archive version signature.
 2012-11-22 21:02:50 +05:30
Moinak Ghosh
5b1a13480b Fix chunk flag setup when compression fails in adaptive mode. 
Prevent display of non-fatal errors during compression.
 2012-11-09 21:07:23 +05:30
Moinak Ghosh
3851c9c6cc Delay allocation of per-thread chunks for performance and memory efficiency. 
Avoid allocating double-buffer for single-chunk files.
Introduce lzmaMt option to indicate multithreaded LZMA.
Update README.
 2012-08-18 22:00:14 +05:30
Moinak Ghosh
9eac774eb1 Add multithreaded LZMA port from p7zip 
Compute balanced thread count between chunk threads and algo threads
Generic way to handle querying algorithm parameters
Clean up unnecessary includes
 2012-08-18 10:20:52 +05:30
Moinak Ghosh
203008def9 Further improve LZMA compression parameters to utilize all the 14 levels. 
Tweak some Rabin parmeters for better reduction with zlib and Bzip2.
 2012-07-30 23:30:13 +05:30
Moinak Ghosh
a873f92e41 Fix crash when decompressing deduped archive. 
Ensure correct level is passed to lzma.
Avoid branch when wrapping rabin window position and check for rabin window size to be power of 2.
Update rabin parameters check for adaptive modes.
Add detection of 7-bit text/8-bit binary data for later use.
 2012-07-10 20:14:23 +05:30
Moinak Ghosh
db0c9ea9ac Improve LZMA compression parameters at extreme levels. 
Fix incorrect thread calculation.
Remove some cruft.
 2012-07-09 23:28:11 +05:30
Moinak Ghosh
d3f5287ee5 Update License info to LGPLv3. 2012-07-07 22:18:29 +05:30
Moinak Ghosh
a1825a2305 Implement Parallel deduplication support. 
Restructure compression functions to take chunk flag as argument.
Add missing error flag printing in LZMA.
Only create enough threads as needed by chunk size and file size.
Minor cleanups and variable name changes.
 2012-07-01 21:44:02 +05:30
Moinak Ghosh
e46d3d10b3 Add basic compression statistics and new option to display them. 2012-05-31 21:36:33 +05:30
Moinak Ghosh
2eaf151ca0 New capability in allocator to add slab caches with user-specified size. 
Use specific slab caches in main program and Lzma to slightly reduce memory footprint.
Fix missing hashtable counter update in allocator.
Slight cleanup of repeated computation with macro in Lzma.
 2012-05-31 13:06:40 +05:30
Moinak Ghosh
07dfed7769 Initial Commit. 2012-05-28 20:19:29 +05:30