LIF (Knowledge Dynamics)
(Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|lif}} |released=≤1989 }} '''.LIF''' is an installer-archive format, apparently associated with ''INST...") |
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This article covers the LIF format that begins with a string of ASCII-encoded hex digits. Note that the presumed successor format, [[RED (Knowledge Dynamics)|RED]], also sometimes uses the .LIF filename extension. | This article covers the LIF format that begins with a string of ASCII-encoded hex digits. Note that the presumed successor format, [[RED (Knowledge Dynamics)|RED]], also sometimes uses the .LIF filename extension. | ||
| − | == File structure == | + | == Format details == |
| + | === File structure === | ||
A LIF file consists of a sequence of member file segments. Each member consists of a 54-byte header, then the file data, which is usually compressed. | A LIF file consists of a sequence of member file segments. Each member consists of a 54-byte header, then the file data, which is usually compressed. | ||
The header starts with 34 bytes of ASCII-encoded hex digits. A filename follows. The bytes at offset 8 through 15 encode the compressed data size, which is needed to locate the next member. | The header starts with 34 bytes of ASCII-encoded hex digits. A filename follows. The bytes at offset 8 through 15 encode the compressed data size, which is needed to locate the next member. | ||
| + | |||
| + | === Header structure === | ||
| + | The 54-byte member header seems to have the following structure: | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! Offset !! Size (in file) !! Size (decoded) !! Description | ||
| + | |- | ||
| + | |0 || 8 || 4 || [[MS-DOS date/time|DOS date, time]] | ||
| + | |- | ||
| + | |8 || 8 || 4 || Compressed size | ||
| + | |- | ||
| + | |16 || 8 || 4 || Original size | ||
| + | |- | ||
| + | |24 || 4 || 2 || CRC of compressed data ([[CRC-16#CRC-16/IBM-3740|CRC-16/IBM-3740]]) | ||
| + | |- | ||
| + | |28 || 4 || 2 || CRC of uncompressed data | ||
| + | |- | ||
| + | |32 || 2 || 1 || Compression method | ||
| + | |- | ||
| + | |34 ||colspan="2"| 20 || Filename, NUL-padded. This 20-byte field might use as little as 12 bytes for the filename, with the remaining bytes having an undetermined purpose. | ||
| + | |} | ||
| + | |||
| + | === Compression methods === | ||
| + | Method 1 is uncompressed. Method 2 is [[LZW]], possibly the same as [[Zoo]]. Method 3 has been observed, but is unidentified. | ||
| + | |||
| + | FWIW, there is a "Knowledge Dynamics LZW COMPRESSOR" format that was used in some video games: [https://moddingwiki.shikadi.net/wiki/CC_Format], via [https://moddingwiki.shikadi.net/wiki/Knowledge_Dynamics_LZW_COMPRESSOR]. However, it seems different from the LZW compression used in LIF. | ||
| + | |||
| + | == Software == | ||
| + | * {{Deark}} | ||
== Sample files == | == Sample files == | ||
| Line 18: | Line 48: | ||
* {{CdTextfiles|ccbwindows93/DEMOS/FINDEMO1.ZIP|FINDEMO1.ZIP}} → *.LIF | * {{CdTextfiles|ccbwindows93/DEMOS/FINDEMO1.ZIP|FINDEMO1.ZIP}} → *.LIF | ||
* {{CdTextfiles|cica/cica9207/WIN3/DEMO/ORIGINWM.ZIP|ORIGINWM.ZIP}} → *.LIF | * {{CdTextfiles|cica/cica9207/WIN3/DEMO/ORIGINWM.ZIP|ORIGINWM.ZIP}} → *.LIF | ||
| + | * {{DexvertSamples|archive/lifArchive}} | ||
Latest revision as of 19:15, 14 November 2024
.LIF is an installer-archive format, apparently associated with INSTALL for DOS, by Knowledge Dynamics Corporation. See RED (Knowledge Dynamics) for more information about INSTALL.
This article covers the LIF format that begins with a string of ASCII-encoded hex digits. Note that the presumed successor format, RED, also sometimes uses the .LIF filename extension.
Contents |
[edit] Format details
[edit] File structure
A LIF file consists of a sequence of member file segments. Each member consists of a 54-byte header, then the file data, which is usually compressed.
The header starts with 34 bytes of ASCII-encoded hex digits. A filename follows. The bytes at offset 8 through 15 encode the compressed data size, which is needed to locate the next member.
[edit] Header structure
The 54-byte member header seems to have the following structure:
| Offset | Size (in file) | Size (decoded) | Description |
|---|---|---|---|
| 0 | 8 | 4 | DOS date, time |
| 8 | 8 | 4 | Compressed size |
| 16 | 8 | 4 | Original size |
| 24 | 4 | 2 | CRC of compressed data (CRC-16/IBM-3740) |
| 28 | 4 | 2 | CRC of uncompressed data |
| 32 | 2 | 1 | Compression method |
| 34 | 20 | Filename, NUL-padded. This 20-byte field might use as little as 12 bytes for the filename, with the remaining bytes having an undetermined purpose. | |
[edit] Compression methods
Method 1 is uncompressed. Method 2 is LZW, possibly the same as Zoo. Method 3 has been observed, but is unidentified.
FWIW, there is a "Knowledge Dynamics LZW COMPRESSOR" format that was used in some video games: [1], via [2]. However, it seems different from the LZW compression used in LIF.
[edit] Software
[edit] Sample files
- dosdrvrs.zip → *.LIF
- FINDEMO1.ZIP → *.LIF
- ORIGINWM.ZIP → *.LIF
- dexvert samples — archive/lifArchive
