Micrognosis Compression Archiver
From Just Solve the File Format Problem
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! ID !! Description and remarks | ! ID !! Description and remarks | ||
|- | |- | ||
| − | |<code>hf0</code> || Generic Huffman | + | |<code>-hf0-</code> || Generic Huffman |
|- | |- | ||
| − | |<code>ah0</code> || Adaptive Huffman | + | |<code>-ah0-</code> || Adaptive Huffman |
|- | |- | ||
| − | |<code>ari</code> || Arithmetic | + | |<code>-ari-</code> || Arithmetic |
|} | |} | ||
| Line 30: | Line 30: | ||
! ID !! Description and remarks | ! ID !! Description and remarks | ||
|- | |- | ||
| − | |<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 | + | |<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 |
|} | |} | ||
Revision as of 13:53, 16 October 2020
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
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 |
Identifiers
The executable file is named "MAR.EXE". MAR does not seem to have a standard filename extension, though one might logically use .MAR.
