puffin: Guard PuffinStream agains corrupt patches.

Adds checks for input puffs and deflate arrays when given to
PuffinStream to make sure they are in the correct format and
size. e.g. ordered and non-overlapping.

BUG=none
TEST=unittests pass

Change-Id: I23ec32939a89fe456a0dfc559f6831d1b4a9cc1f
Reviewed-on: https://chromium-review.googlesource.com/764395
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
1 file changed
tree: 56a9bcb6b5c4308ec57a110fc6202f153cac6b61
  1. LICENSE
  2. Makefile
  3. OWNERS
  4. PRESUBMIT.cfg
  5. README.md
  6. libpuffdiff.pc
  7. libpuffpatch.pc
  8. puffin.gyp
  9. src/
README.md

Puffin

Source code for Puffin: A utility for deterministic DEFLATE recompression.

TODO(ahassani): Describe the directory structure and how-tos.

Glossary

  • 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_.