puffin: Guard puffpatch against corrupt patches

This CL adds some size checks for the incoming patch in puffpatch to detect
corrupt or malicious patches.

BUG=none
TEST=unittests pass

Change-Id: Ibc825f15652970a56dca2144ed39d495e5fb940d
Reviewed-on: https://chromium-review.googlesource.com/763871
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: 59225b9e5c62251038111d87bf85a87eeb04086a
  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_.