Freeze/Melt
From Just Solve the File Format Problem
(Difference between revisions)
ChristoCoder (Talk | contribs) (Fixed source code link, site was dead) |
(Added an extension found "in the wild" (although I cannot get the decompressor to compile, and, as I do not want to set up an emulator, cannot test this). Fixed link.) |
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|formattype=electronic | |formattype=electronic | ||
|subcat=Compression | |subcat=Compression | ||
| − | |extensions={{ext|F}}, {{ext|f}} | + | |extensions={{ext|F}}, {{ext|f}}, {{ext|lzc}} |
}} | }} | ||
'''Freeze''' is a file compression utility used from the command line in Unix-style operating systems. '''Melt''' is the corresponding decompressor. It is considered obsolete now in favor of [[gzip]]. | '''Freeze''' is a file compression utility used from the command line in Unix-style operating systems. '''Melt''' is the corresponding decompressor. It is considered obsolete now in favor of [[gzip]]. | ||
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== References == | == References == | ||
* [http://www.esrl.noaa.gov/gmd/dv/hats/cats/stations/qnxman/freeze.html Man page] (in NOAA site, which should know something about freezing!) | * [http://www.esrl.noaa.gov/gmd/dv/hats/cats/stations/qnxman/freeze.html Man page] (in NOAA site, which should know something about freezing!) | ||
| − | * [http://ibiblio.org/pub/linux/utils/compress/freeze-2.5.0.tar.gz | + | * [http://ibiblio.org/pub/linux/utils/compress/freeze-2.5.0.tar.gz Source code] |
[[Category:File formats with case sensitive extensions]] | [[Category:File formats with case sensitive extensions]] | ||
Revision as of 00:18, 11 February 2019
Freeze is a file compression utility used from the command line in Unix-style operating systems. Melt is the corresponding decompressor. It is considered obsolete now in favor of gzip.
A two-pass compression is done with a Lempel-Zev algorithm on the first pass and a dynamic Huffman algorithm on the second. The characteristics of the Huffman table used are added to the file. File attributes, ownership, etc., are preserved, and a .F extension is added. A two-byte magic number is prepended to the file (\037\236 octal for versions 1.x, and \037\237 for later versions).
References
- Man page (in NOAA site, which should know something about freezing!)
- Source code
