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* Rewritten: BZip3 Format Explanation * Added: Link to ImHex Pattern * Added: Little Endian Suffix to Pseudostructs * Bugfix: I accidentally swapped 'file' and 'frame' format around. * Fixed: Used wrong field when defining used block type in size comparison * update filter names * improve phrasing in overview.md --------- Co-authored-by: Kamila Szewczyk <27734421+kspalaiologos@users.noreply.github.com>
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BZip3 Format Documentation
BZip3 is a modern compression format designed for high compression ratios while maintaining reasonable decompression speeds. It is intended to provide similar compression ratio and performance to LZMA and BZip2; as opposed to faster Lempel-Ziv codecs that usually offer worse compression ratio like ZStandard or LZ4.
This documentation covers the technical specifications of the BZip3 format.
Format Characteristics
- Block level compression (no streams)
- Maximum block size ranges from 65KiB to 511MiB
- Memory usage of ~(6 x block size), both compression and decompression
- Little-endian encoding for integers
- Embedded CRC32 checksums for data integrity
- Combines LZP, RLE followed by Burrows-Wheeler transform and arithmetic coding coupled with a statistical predictor.
Format Overview
BZip3 uses two main top-level formats:
- File Format: The standard format used by the command-line tool
- Frame Format: Used by the high-level API functions
bz3_compressandbz3_decompress.
These formats are very similar: the file format is a superset of the frame format and thus also contains a block count field.
See bzip3_format.md for more details.