README.md
1# Puffin
2
3Source code for Puffin: A utility for deterministic DEFLATE recompression.
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5TODO(ahassani): Describe the directory structure and how-tos.
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7## Glossary
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9* __Alphabet__ A value that occurs in the input stream. It can be either a
10 literal:[0..255], and end of block sign [256], a length[257..285], or a
11 distance [0..29].
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13* __Huffman code__ A variable length code representing the Huffman encoded of an
14 alphabet. Huffman codes can be created uniquely using Huffman code length
15 array.
16* __Huffman code array__ An array which an array index identifies a Huffman code
17 and the array element in that index represents the corresponding
18 alphabet. Throughout the code, Huffman code arrays are identified by
19 vectors with postfix `hcodes_`.
20* __Huffman reverse code array__ An array which an array index identifies an
21 alphabet and the array element in that index contains the Huffman code of
22 the alphabet. Throughout the code, The Huffman reverse code arrays are
23 identified by vectors with postfix `rcodes_`.
24* __Huffman code length__ The number of bits in a Huffman code.
25* __Huffman code length array__ An array of Huffman code lengths with the array
26 index as the alphabet. Throughout the code, Huffman code length arrays
27 are identified by vectors with postfix `lens_`.
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