hayro-ccitt

A decoder for CCITT fax-encoded images.

This crate implements the CCITT Group 3 and Group 4 fax compression algorithms as defined in ITU-T Recommendations T.4 and T.6. These encodings are commonly used for bi-level (black and white) images in PDF documents and fax transmissions.

The main entry point is the decode function, which takes the encoded data and a DecoderContext, and outputs the decoded pixels through a Decoder trait that can be implemented according to your needs. For example, you could implement the trait such that the decoded pixels are written into a vector, but you could also configure it to instead print the pixels to standard output, without any intermediate allocations.

The crate is no_std compatible but requires an allocator to be available.

Safety

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.