Moinak Ghosh
a43fdd7d2c
Improve Delta2 scanning speed and effectiveness.
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Add destination buffer overflow check in Delta2.
Add rough speed computation.
2012-12-23 00:44:56 +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
d250322490
Fix issues with error handling.
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Add new tests for out of range values and corrupted file.
2012-11-24 23:53:07 +05:30
Moinak Ghosh
d054e0f713
Zlib optimizations. Use raw deflate streams to avoid unnecessary adler32.
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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
393ced991a
A couple of minor cleanups.
2012-11-18 20:20:16 +05:30
Moinak Ghosh
b2cbf0699e
Use fixed rolling-hash mask for better block size approximation.
2012-11-11 14:58:39 +05:30
Moinak Ghosh
eacbf207aa
Tweak chunking parameters for better block size distribution and dedupe ratio.
2012-11-08 19:41:33 +05:30
Moinak Ghosh
e437390e53
Add some more debug mode info.
2012-11-07 22:55:14 +05:30
Moinak Ghosh
c5ebe1f30a
Portability to Debian based distros.
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Enable SSE4/AVX detection for AMD platforms (Bulldozer has both).
Portable long long int print formatting to silence gcc 4.6 warnings.
2012-10-21 21:03:07 +05:30
Moinak Ghosh
9475ccc3d6
Fix polynomial computation.
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Fix incorrect block length when doing fixed-block dedupe.
2012-10-02 00:20:44 +05:30
Moinak Ghosh
0019efbadb
Adjust break pattern check mask for closer approximation to average block size.
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Remove unused structure member.
2012-09-29 23:31:45 +05:30
Moinak Ghosh
24e6f4e629
Switch to multiplicative rolling hash for good distribution properties.
2012-09-29 00:09:49 +05:30
Moinak Ghosh
8f8af7ed6b
Update adaptive mode heuristic based on algorithms.
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Remove incorrect check in PPMd decompression code.
More refactoring of variable names.
2012-09-27 22:29:08 +05:30
Moinak Ghosh
449dc35675
Speed up adaptive modes by using heuristics to select compression algorithm.
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Select similarity percentage based on dedupe block size for effectiveness.
2012-09-26 19:47:32 +05:30
Moinak Ghosh
333b7b011e
Fix check for size reduction in dedupe.
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Tweak debug message for clarity.
2012-09-25 23:24:33 +05:30
Moinak Ghosh
3544a8c708
Fix polynomial table computation.
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Change hashing and length bias to reduce hashtable bucket collisions.
Add support for user-selectable 60% or 40% similarity for Delta Compression.
Overall slight speedup.
2012-09-24 22:20:27 +05:30
Moinak Ghosh
8386e72566
Rewrite core dedupe logic to simplify code and improve performance.
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Hashtable based chunk-level deduplication instead of Quicksort.
Fix a corner case bug in Dedupe decompression.
2012-09-23 14:57:09 +05:30
Moinak Ghosh
99a8e4cd98
Speed up Hash computation for dedupe blocks.
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Add missing initialization of sliding window.
Update help text.
2012-09-19 20:29:44 +05:30
Moinak Ghosh
e3befd9e16
Add support for Fixed-Block deduplication.
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More refactoring of symbol names.
2012-09-16 11:12:58 +05:30
Moinak Ghosh
b9355a5dcc
Reduce dedupe loop checks for slight speed edge.
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Beginnings of Fixed-block dedupe.
Update variable name for clarity.
2012-09-15 11:14:58 +05:30
Moinak Ghosh
f3f472b860
Implement K-min-values Sketch for Similarity detection.
2012-09-11 20:26:36 +05:30
Moinak Ghosh
e6f042aaf8
Allow user-specified minimum Dedupe block size.
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Compute similarity sketch only if Delta Compression enabled.
2012-09-05 22:43:54 +05:30
Moinak Ghosh
560fa85aab
Fix secondary sketch computation, some more accuracy in diff detection.
2012-09-04 23:28:02 +05:30
Moinak Ghosh
262566b59a
Add xxHash for Rabin block checksums, slightly faster than CRC64.
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Fix missing initialization of character counts table.
Some file reorganization.
2012-09-02 20:40:32 +05:30
