Iff

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If and only if

Iff is a shorthand for if and only if, reglarly used in logic, theorems, and predicates elsewhere.

Interchange File Format

This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. (Feel free to ignore, fix, or tell me)

Interchange File Format (IFF) is a chunked file format originally introduced by Electronic Arts in 1985, and that specification can be referred to as EA IFF 85.

There are various mild variations, a few derivative formats, and a few that use a very similar chunking scheme.


Used in/for things like:

  • WebP
  • Audio Interchange File Format (AIFF/AIFF-C)
  • DjVu
  • 8SVX
  • Real Media File Format (RMFF)

Similar formats:

  • Microsoft's RIFF - the basis of AVI (video), WAV files storing PCM sound, ANI, and more
  • MIDI uses a similar setup
  • Nero's NRG images

Note: TIFF is not IFF-based, although it seems to have a similar approach(verify)


See also: