Interchange File Format definition file format
(IFF, full name "EA IFF 1985") A generic file format published by Electronic Arts as an open standard. IFF is chunk
-based and hierarchical so files can include other files. It is easily extensible and an all round Good Idea.
An IFF file starts with one of the following "group IDs": 'FORM', 'LIST' or 'CAT '. This is followed by an unsigned 32-bit number of bytes in the remainder of the file. Then comes an ID that indicates which type of IFF file this is. The main image type is ILBM
is either AIFF
or 8SVX, animations are ANIM
etc. An IFF file will probably have a filename extension
related to this file type stored in the file. The rest of the file is divided into chunks
each of which also has a four-byte header and byte count. Microsoft WAV
are all based around an almost identical scheme to IFF called RIFF
. The main difference is that, in RIFF files, numbers are little-endian as on Intel
processors, whereas in IFF files they are big-endian, as on the Motorola 68000
processors in the Amiga
where IFF files were first used.