bma

The archiver works under following scheme:

1. Set of filters.
2. Burrows-Wheeler Transform (BWT).
3. Advanced "Move To Front" (MTF) or "Sorted Inversion Frequencies" (SIF).
4. 1-2 encoding.
5. Arithmetic coding with use of Peter Fenwick's structural model.

The archiver has some methods of data preprocessing for improvement of compression:

• Preprocessing of texts data: EOL-coding and upper-case to lower-case convertion.
• Two variants of preprocessing for 32 bit tables (gives better compression of executable files and Microsoft Office documents).
• Transformation of relative addresses in absolute (call/jmp conversion) for better compression of executable files.
• Delta-encoding improves compression of PCM WAVE files and 24 bit pictures (not compressed Bitmap, Targa).
• LZP preprocessing speeds up BWT, but essentially slows down decompression.
• Run Length Encoding (RLE)

The compressor is featured in the BWT comparison.

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