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Brandon ThomasandClaude Opus 5.5
6e90710e4b
The nightly fuzz job found a JBIG2 symbol dictionary that decoded for minutes: each bitmap side may be 65535, and up to 65535 symbols are decoded pixel by pixel. Vendored hayro-jbig2 0.3.0 with two bounds: at most 2^28 pixels per bitmap (also the page bitmap, halftone grid and grayscale image), and at most 2^26 symbol pixels per dictionary. The finding now finishes in about a second. Synthetic regression test (a 65535 x 65535 page and region behind a small /Width and /Height); the corpus sweep shows 0 regressions. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1.2 KiB
1.2 KiB
hayro-jbig2
A memory-safe, pure-Rust JBIG2 decoder.
hayro-jbig2 decodes JBIG2 images as specified in ITU-T T.88 (also known as
ISO/IEC 14492). JBIG2 is a bi-level image compression standard commonly used
in PDF documents for compressing scanned text documents.
Status
This crate is currently under development.
Safety
By default, the crate has the simd feature enabled, which uses the
fearless_simd crate to accelerate decoding of JBIG2 images with halftoning.
If you want to eliminate any usage of unsafe in this crate as well as its dependencies, you can simply disable this
feature and still get very good performance in the vast majority of cases. Unsafe code is forbidden
via a crate-level attribute.
License
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.