Hammer (compression)

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File Format
Name Hammer (compression)
Ontology
Released ~1994

Hammer (sometimes abbreviated HMR) is a compressed file format used by the RISC OS games Asylum and Oddball. The format and the games were developed by Andy Southgate.

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Identification

Files begin with ASCII "Hmr", followed by a byte with value 0x00 or 0x01.

Files with 0x01 at offset 3 use a slightly different compression scheme, and are apparently expected to decompress to a FastSpr sprite file.

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