commit | b8325c22bbcdf75fb0d28951b7565437834e9196 | [log] [tgz] |
---|---|---|
author | Amin Hassani <ahassani@google.com> | Tue May 22 14:57:22 2018 -0700 |
committer | Amin Hassani <ahassani@google.com> | Mon Jun 04 17:01:12 2018 -0700 |
tree | cc08c119e0af9e8d161648c0f1a069b84dc52582 | |
parent | 7d8bd3ff4572720aa61c533561cf754d5869ec05 [diff] |
Remove uncompressed blocks from deflate lists. Currently, we are including all the uncompressed blocks in the deflate buffer. But that is totally unneeded since that is just an overhead and there is no special magic puffin conversions happening. This patch removes the uncompressed blocks in FindDeflateSublocks() function. The puffdiff and other use cases still have to process uncompressed blocks. Bug: 80148425 Test: unitest Test: ran on a corpus Change-Id: I2ccf1200dd6ebb2d244d992054c1f2c4647c4c2d
Source code for Puffin: A utility for deterministic DEFLATE recompression.
TODO(ahassani): Describe the directory structure and how-tos.
Alphabet A value that occurs in the input stream. It can be either a literal:[0..255], and end of block sign [256], a length[257..285], or a distance [0..29].
Huffman code A variable length code representing the Huffman encoded of an alphabet. Huffman codes can be created uniquely using Huffman code length array.
Huffman code array An array which an array index identifies a Huffman code and the array element in that index represents the corresponding alphabet. Throughout the code, Huffman code arrays are identified by vectors with postfix hcodes_
.
Huffman reverse code array An array which an array index identifies an alphabet and the array element in that index contains the Huffman code of the alphabet. Throughout the code, The Huffman reverse code arrays are identified by vectors with postfix rcodes_
.
Huffman code length The number of bits in a Huffman code.
Huffman code length array An array of Huffman code lengths with the array index as the alphabet. Throughout the code, Huffman code length arrays are identified by vectors with postfix lens_
.