Micrognosis Compression Archiver
From Just Solve the File Format Problem
(Difference between revisions)
m (→Format details) |
m (→Format details) |
||
| Line 32: | Line 32: | ||
|<code>-arn-</code> || Arithmetic N | |<code>-arn-</code> || Arithmetic N | ||
|- | |- | ||
| − | |<code>-lzs-</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's scheme of the same ID.) | + | |<code>-lzs-</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as [[LArc]]'s scheme of the same ID.) |
|- | |- | ||
|<code>-lzw-</code> || LZW BIT-12,13,14/LZW-fix,var | |<code>-lzw-</code> || LZW BIT-12,13,14/LZW-fix,var | ||
Latest revision as of 14:55, 25 April 2021
Micrognosis Compression Archiver, sometimes called MAR, is a compressed archive utility for DOS (and maybe other platforms?).
The software is a bit vague about who exactly is responsible for it. No doubt Haruhiko Okumura had a lot to do with it, but it would be nice to have independent confirmation of a connection between him and Micrognosis. The credits for version 1.0 say:
Original Version By: Stratus VOS 11.5 Version by: Haruhiko Okumura Richard Schiller
[edit] Format details
MAR uses generalized LHA format, with some custom compression schemes:
| ID | Description and remarks |
|---|---|
-hf0- |
Generic Huffman |
-ah0- |
Adaptive Huffman |
-ari- |
Arithmetic |
It also uses the standard "lh0" scheme, for uncompressed files.
The documentation lists more compression schemes, but they don't seem to be implemented:
| ID | Description and remarks |
|---|---|
-arn- |
Arithmetic N |
-lzs- |
LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's scheme of the same ID.) |
-lzw- |
LZW BIT-12,13,14/LZW-fix,var |
[edit] Identifiers
The executable file is named "MAR.EXE". MAR does not seem to have a standard filename extension, though one might logically use .MAR.
