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Author SHA1 Message Date
Moinak Ghosh
296e2ab6b2 Add support for LZ4 compression including multi-pass LZ4. 
Add missing Read_Adjusted() declaration, was causing a crash with 2GB chunks.
Fix minor cut-paste issues in comments.
 2012-07-25 21:07:36 +05:30
Moinak Ghosh
53d4311534 Make LZFX Hash size dynamic. 
Use smaller min rabin block when using fast compression algos.
Add missing check for algo init function return value.
 2012-07-23 21:43:12 +05:30
Moinak Ghosh
8cfd54fe34 Add LZFX Compression support, a very fast lightweight compressor. 
Avoid a branch in the rabin loop.
 2012-07-23 00:15:08 +05:30
Moinak Ghosh
7e14909ad1 Separate initial rabin boundary detection and block splitting for performance. 
Also fix a rare corner case latent bug.
 2012-07-22 21:27:44 +05:30
Moinak Ghosh
962a2cae8a Compress Dedup index only if it is at least 90 bytes to avoid expansion. 
Some minor cleanup.
 2012-07-22 00:00:41 +05:30
Moinak Ghosh
b69dcf4d55 Remove debug statements. 2012-07-20 21:38:39 +05:30
Moinak Ghosh
fd7c7e9a65 Use 4-byte ints for header values instead of 8-byte size_t. 
Use RLE on control data if it reduces the size.
Update some comments.
Use scratch space at end of data chunk, if available.
 2012-07-20 20:53:46 +05:30
Moinak Ghosh
e788eb43b8 Implement Delta Encoding based on modified bsdiff. 
Change to more accurate Sketch value computation approach.
 2012-07-19 21:41:07 +05:30
Moinak Ghosh
1da2c40888 Use a rolling checksum based sketch value for a rabin chunk instead of a CRC64 checksum. 
Avoids additional table-lookup memory access.
Reduce Rabin window size to avoid overflows in sketch value.
No need to maintain rolling checksum in Rabin context.
A few comment cleanups.
 2012-07-13 22:06:55 +05:30
Moinak Ghosh
0091a0da02 Remove debug messages. 
Fix last segment detection.
 2012-07-10 21:11:31 +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
00d74e86c5 Fix infinite loop when dedup is disabled. 2012-07-08 22:31:09 +05:30
Moinak Ghosh
010f49f412 Implement ability to partition chunks at the last rabin boundary instead of fixed size. 2012-07-08 21:44:08 +05:30
Moinak Ghosh
d3f5287ee5 Update License info to LGPLv3. 2012-07-07 22:18:29 +05:30
Moinak Ghosh
172432698e Adjust Rabin parameters for chunksize > LZMA window size. 2012-07-07 00:01:13 +05:30
Moinak Ghosh
ea923b84f0 Use different min block size and Rabin break pattern depending on compression algo. 
Cleanup some cruft.
 2012-07-06 23:24:12 +05:30
Moinak Ghosh
f5ce45b16e Techniques to better reduce Rabin Metadata. 
Fix wrong chunk sizing with dedup enabled.
 2012-07-06 00:16:02 +05:30
Moinak Ghosh
774384c204 Remove debug statement. 2012-07-04 23:39:03 +05:30
Moinak Ghosh
3f0e1952ef Fix compile warnings. 2012-07-04 23:20:10 +05:30
Moinak Ghosh
1eee08040f Use diferent average Rabin block sizes depending on compression algorithm. 
Misc cleanups.
 2012-07-03 22:47:24 +05:30
Moinak Ghosh
a13c61e926 Change rabin index encoding scheme for better metadata compression. 2012-07-02 22:08:03 +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
f9c3644459 Updates to Rabin based Dedup. 
Change command line option.
 2012-06-29 23:45:06 +05:30
Moinak Ghosh
cbf9728278 Implement Deduplication based on Rabin Fingerprinting: work in progress. 
Fix bug that prevented pipe mode from being used.
Allow building without specialized allocator.
Use basic optimize flag in debuig build.
 2012-06-29 18:23:55 +05:30
Moinak Ghosh
8f5f531967 Add license and other minor fixes. 2012-06-21 20:40:43 +05:30
Moinak Ghosh
733923cbf2 Add ability to adjust chunk boundary based on Rabin Fingerprinting to improve compression. 
Remove unnecessary checks in compression loop.
 2012-06-21 20:27:05 +05:30
Moinak Ghosh
7e9f636f8d Change adaptive modes. 2012-06-01 22:04:08 +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
b3fe43da1d Fix dynamic slab insertion. 2012-05-31 18:12:32 +05:30
Moinak Ghosh
3cdfa86d65 Portability to Solaris and derivative platforms. 2012-05-31 18:01:34 +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
moinakg
10e0a75b67 Initial commit 2012-05-19 08:54:47 -07:00