Bzip2

From Just Solve the File Format Problem
(Redirected from BZ2)
Jump to: navigation, search
File Format
Name bzip2
Ontology
Extension(s) .bz2
MIME Type(s) application/x-bzip2
PRONOM x-fmt/268
Released 1997

bzip2 is a data compression algorithm and compressed file format.

Contents

Identification

Files begin with magic number "BZ" (bytes 42 5A). Then either an "h" (0x68; Huffman coding) or "0" (0x30; deprecated original version), then the block size, in 100kb units (TODO: clarify this).

Each compressed block starts with a magic number 0x314159265359 (yes, that is the start of decimal π, but in hex.)

The end of file marker uses magic number 0x177245385090 (square root of π, in the same ... interesting ... format.)

Software

Sample files

See also

Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox