OS/2 PACK archive
From Just Solve the File Format Problem
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== Format details == | == Format details == | ||
| − | The compression | + | |
| + | === Compression scheme === | ||
| + | The compression is a kind of [[LZW]] with 12-bit codes. Code 0 marks the end of data; codes 1-256 are literals; 257-4095 are dynamic. If the code table is full, the least-recently-used leaf code is reused. | ||
| + | |||
| + | This is the same compression used by [[LoadDskF/SaveDskF]]. | ||
| + | |||
| + | === Other format details === | ||
| + | The format apparently supports OS/2 extended attributes, compressed independently following the compressed file data. | ||
== Identification == | == Identification == | ||
Files start with bytes {{magic|a5 96 fe ff}}. | Files start with bytes {{magic|a5 96 fe ff}}. | ||
| + | |||
| + | == Software == | ||
| + | OS/2 software: | ||
| + | * UNPACK.EXE (Included with OS/2; also found in other packages.) | ||
| + | ** [https://archive.org/details/os2sharewarebbs OS/2 Shareware BBS Full Collection] → 33-VDrivers.zip → cirrus1.zip → UNPACK.EXE | ||
| + | * [https://archive.org/details/os2sharewarebbs OS/2 Shareware BBS Full Collection] → 10-Tools.zip → warptlk3.zip → TOOLKIT/BIN/PACK.EXE | ||
| + | * {{Deark}} | ||
== Sample files == | == Sample files == | ||
Revision as of 13:15, 25 April 2024
OS/2 PACK archive is a compressed archive format used for software installation on OS/2.
This article covers the format with signature bytes a5 96 fe ff. For signature a5 96 fd ff, see OS/2 PACK2 archive.
PACK format is generally associated with the OS/2 PACK.EXE and UNPACK.EXE utilities.
Contents |
Format details
Compression scheme
The compression is a kind of LZW with 12-bit codes. Code 0 marks the end of data; codes 1-256 are literals; 257-4095 are dynamic. If the code table is full, the least-recently-used leaf code is reused.
This is the same compression used by LoadDskF/SaveDskF.
Other format details
The format apparently supports OS/2 extended attributes, compressed independently following the compressed file data.
Identification
Files start with bytes a5 96 fe ff.
Software
OS/2 software:
- UNPACK.EXE (Included with OS/2; also found in other packages.)
- OS/2 Shareware BBS Full Collection → 33-VDrivers.zip → cirrus1.zip → UNPACK.EXE
- OS/2 Shareware BBS Full Collection → 10-Tools.zip → warptlk3.zip → TOOLKIT/BIN/PACK.EXE
- Deark
