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XADMaster-wiki/Rle90Algorithm.md
Paul Taykalo 6cb09b0ad9 Migrate wiki to the Github
2018-03-09 17:43:00 +02:00

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Description

This is a simple RLE algorithm used by some old Mac archivers such as StuffIt. It uses a single-byte escape code to encode repeated runs of characters.

  • The byte 0x90 followed by a a single non-zero byte N start a run of N-1 repetitions of the last byte previously output.
  • 0x90 0x00 outputs the byte "0x90".
  • 0x90 0x01 seems to either be a no-op or illegal.
  • Any other byte sequence is a literal string.