Zoo
From Just Solve the File Format Problem
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* [http://distcache.freebsd.org/ports-distfiles/zoo-2.10pl1.tar.gz zoo-2.10pl1.tar.gz] | * [http://distcache.freebsd.org/ports-distfiles/zoo-2.10pl1.tar.gz zoo-2.10pl1.tar.gz] | ||
* [http://www.ibiblio.org/pub/Linux/utils/compress/zoo-2.10-3.src.rpm zoo-2.10-3.src.rpm] | * [http://www.ibiblio.org/pub/Linux/utils/compress/zoo-2.10-3.src.rpm zoo-2.10-3.src.rpm] | ||
| + | * [https://build.opensuse.org/package/show/openSUSE:Factory/zoo openSUSE maintained variant of zoo-2.10] | ||
| + | * [https://github.com/troglobit/zoo zoo - GitHub] - "A service to all computer archaeologists and acts as a focal point for patches and maintenance for the long haul." Provides updated licensing terms that it is now Unlicense/Public Domain. | ||
== Sample files == | == Sample files == | ||
Latest revision as of 14:11, 4 September 2025
Zoo is a compressed archive format developed by Rahul Dhesi. It was one of the many competing archive formats in the 1980s, and was based (originally) on LZW compression. It had some popularity with Open/VMS and Amiga systems, but didn't ultimately win out over ZIP.
Contents |
[edit] Discussion
The Zoo software encompassed several different utilities, which were sometimes distributed individually, and which had their own version numbers.
- Zoo - The main program
- Ooz - Extractor
- Booz (Barebones Ooz) - Extractor; some versions can also list files
- Looz (Ooz with List) - Extract/list/execute
- Atoz - Helper utility for converting other formats (ARC, LBR) to Zoo
- Fiz - Analyze damaged Zoo files
- Stuff - File finder
- Sez - Self-Extracting Zoo utility
[edit] Compression methods
| ID | Name | Description |
|---|---|---|
| 0 | No packing | Uncompressed |
| 1 | LZD | LZW. A fairly generic LZW implementation, with a dynamic code size from 9 to 13 bits, and two special codes: 256=Clear, 257=Stop. |
| 2 | LZH | LZ77+Huffman. Nearly identical to LHA's "lh5" method. A small difference is that Zoo defines a way to mark the end of data. The format is pretty well documented in the comments in unzoo.c by Martin Schoenert (see below). |
[edit] Identification
Files have bytes DC A7 C4 FD at offset 20.
Zoo files typically start with "ZOO ?.?? Archive.", followed by the byte 0x1a, where each "?" is a digit. Regarding this field, the source code says "The contents of the text message are however not used by Zoo and they may be anything."
[edit] Related formats
- Zoo filter format
- Zoo Z format
- Brik - same author
[edit] Specifications
[Ed. note: The Zoo format information in these documents is not of the highest quality. We haven't found a specification that is reasonably complete and correct.]
- The ZOO Archive File Format from Corion.net, via FileFormat.info
- Archive format info, including ZOO
- ZOO file header format (among other archive types)
[edit] Software
- Konvertor
- Zoo - DOS binaries
- v1.20 (1986-09-06)
- v1.21 (1986-09-21)
- v1.22 (1986-10-01): [1] → ibm-wgam-wbiz-collection/xtra0320-0329.zip → xtra0321.tar → FNW315-1.ZIP → ZOO122.EXE (bare executable)
- v1.40 (1987-01-24): [2] → Shareware_Grab_Bag_1988.zip → 014/zoo140.arc
- v1.41: OS/2 Shareware BBS Full Collection → 08-Other.zip → S12215.ZIP → ZOO.EXE (bare executable)
- v2.00 (~1988-02-06)
- v2.01 (1988-08-25) - Also includes Fiz 2.0 and Stuff 1.0
- v2.10 (1991-07-09)
- Other official Zoo utilities:
- amiga-stuff.com: Archivers - Lists several versions of Zoo for Amiga
- unzoo.c by Martin Schoenert (Does not support LZD.)
- Open-source library in Free Pascal
- Deark
Original(?) source code:
- v1.41 (1987-02-07): ZOO141_C.LZH
- v1.51 (1987-07-12)
- ASME's Mechanical Engineering Toolkit Dec. 1997 → C_LANG/Z150_SRC.LZH
- As posted to Usenet comp.sources.unix 1987-08: [3]
- v2.01 (1988-08-25)
- zoo-2.01.tar.gz
- ASME's Mechanical Engineering Toolkit Dec. 1997 → C_LANG/{Z201SRC1.Z00 + Z201SRC2.Z00}
- Pegasus 2.0 → pegasus/c_2/zoo_src.zip
- v2.10, a.k.a. v2.1 (1991-07-07)
Other source code and packages:
- zoo-2.10pl1.tar.gz
- zoo-2.10-3.src.rpm
- openSUSE maintained variant of zoo-2.10
- zoo - GitHub - "A service to all computer archaeologists and acts as a focal point for patches and maintenance for the long haul." Provides updated licensing terms that it is now Unlicense/Public Domain.
[edit] Sample files
- http://cd.textfiles.com/aminet0294/AMINET/UTIL/ARC/ → *.ZOO
- http://cd.textfiles.com/garbo/PC/ → .../*.ZOO
- http://cd.textfiles.com/geminiatari/ZIP/PROGRAM/ → *.ZOO
- dexvert samples — archive/zoo
[edit] Links
- Wikipedia: Zoo (file format)
- zooplan1.zip → ZOOPLAN1.TXT - A Zoo Manifesto, by Rahul Dhesi (1986-11-01)
- The zoo Archiver User's Guide, by Bill Davidsen (for Zoo 2.01)
- Zoo man page - Includes a change log going back to v1.71
- Zoo 1.21 → ZOOHSTRY.TXT - Has some historical information about older versions
