Icon Heaven library
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| − | '''Icon Heaven library''' (.FIM) is a compressed icon library format associated with the OS/2 shareware utility ''Icon Heaven'', by Paul van Keep | + | '''Icon Heaven library''' (.FIM) is a compressed icon library format associated with the OS/2 shareware utility ''Icon Heaven'', by Paul van Keep. FIM probably stands for ''Frobozz Icon Manager'', which is apparently the software's nickname. |
See also [[OS/2 Icon]]. | See also [[OS/2 Icon]]. | ||
| + | |||
| + | == Format details == | ||
| + | ''[This section contains unconfirmed information based on reverse engineering. Written for the fileformats.archiveteam.org wiki.]'' | ||
| + | |||
| + | === File structure === | ||
| + | A FIM file consists of a 140-byte header, followed by a sequence of icon segments. The two-byte integer at offset 8 is the number of icons. | ||
| + | |||
| + | An icon segment consists of: | ||
| + | * ASCII "<code>ci</code>" | ||
| + | * Compressed size | ||
| + | * Original size | ||
| + | * Unknown 2-byte field | ||
| + | * Name length | ||
| + | * Name | ||
| + | * Compressed data | ||
| + | |||
| + | An icon decompresses to a complete file, in [[OS/2 Icon]] or [[OS/2 Bitmap Array|Bitmap Array]] format. | ||
| + | |||
| + | === Compression === | ||
| + | The compression scheme is a kind of [[LZW]]. Technical information follows. | ||
| + | |||
| + | All codes are 9 bits, msb-first. The code table is cleared after every 256 nonspecial codes. The only known special codes are if the very first code is 510 or 511. | ||
| + | |||
| + | Special code 510 decodes to a particular 88-byte sequence that is common in files whose decompressed size is 3498 bytes. | ||
| + | |||
| + | Special code 511 decodes to a particular 75-byte sequence that is common in files whose decompressed size is 888 bytes. | ||
== Identification == | == Identification == | ||
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** [http://cd.textfiles.com/psl/pslv3nv08/OS2/UT/FIH110.ZIP fih110.zip] | ** [http://cd.textfiles.com/psl/pslv3nv08/OS2/UT/FIH110.ZIP fih110.zip] | ||
** [http://hobbes.nmsu.edu/download/pub/os2/util/wps/fih113.zip fih113.zip] | ** [http://hobbes.nmsu.edu/download/pub/os2/util/wps/fih113.zip fih113.zip] | ||
| + | * {{Deark}} | ||
== Sample files == | == Sample files == | ||
Latest revision as of 17:33, 28 January 2026
Icon Heaven library (.FIM) is a compressed icon library format associated with the OS/2 shareware utility Icon Heaven, by Paul van Keep. FIM probably stands for Frobozz Icon Manager, which is apparently the software's nickname.
See also OS/2 Icon.
Contents |
[edit] Format details
[This section contains unconfirmed information based on reverse engineering. Written for the fileformats.archiveteam.org wiki.]
[edit] File structure
A FIM file consists of a 140-byte header, followed by a sequence of icon segments. The two-byte integer at offset 8 is the number of icons.
An icon segment consists of:
- ASCII "
ci" - Compressed size
- Original size
- Unknown 2-byte field
- Name length
- Name
- Compressed data
An icon decompresses to a complete file, in OS/2 Icon or Bitmap Array format.
[edit] Compression
The compression scheme is a kind of LZW. Technical information follows.
All codes are 9 bits, msb-first. The code table is cleared after every 256 nonspecial codes. The only known special codes are if the very first code is 510 or 511.
Special code 510 decodes to a particular 88-byte sequence that is common in files whose decompressed size is 3498 bytes.
Special code 511 decodes to a particular 75-byte sequence that is common in files whose decompressed size is 888 bytes.
[edit] Identification
Known files begin with bytes 4c 49 00 01 00 00 00 00.
[edit] Software
- Icon Heaven
- Deark
[edit] Sample files
- Some FIM files are included with Icon Heaven (see above).
- ticn10ih.zip - THE OS/2 Icon Collection #10, Icon Heaven edition
- dexvert samples — archive/iconHeaven
[edit] Links
- Icon Heaven article at OS/2 World.Com Wiki
