Freeze/Melt

From Just Solve the File Format Problem
(Difference between revisions)
Jump to: navigation, search
 
Line 9: Line 9:
 
== Format details ==
 
== Format details ==
 
A two-pass compression is done with a [[Lempel-Zev]] algorithm on the first pass and a dynamic [[Huffman coding|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).
 
A two-pass compression is done with a [[Lempel-Zev]] algorithm on the first pass and a dynamic [[Huffman coding|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).
 +
 +
== Software ==
 +
* [http://ibiblio.org/pub/linux/utils/compress/freeze-2.5.0.tar.gz Source code]
 +
* Versions 2.1–2.5 were posted to the comp.sources.misc Usenet group in 1991–1993:
 +
** [{{CdTextfilesURL|sourcecode/usenet/compsrcs/misc/volume17/freeze/}}], [{{CdTextfilesURL|sourcecode/usenet/compsrcs/misc/volume25/freeze/}}], [{{CdTextfilesURL|sourcecode/usenet/compsrcs/misc/volume26/freeze/}}]
 +
** [https://archive.org/details/Source_Code_CD-ROM_Walnut_Creek_March_1994 Source Code CD ROM (Walnut Creek) (March 1994)]
  
 
== 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 Source code]
 
  
 
[[Category:File formats with case sensitive extensions]]
 
[[Category:File formats with case sensitive extensions]]

Latest revision as of 16:07, 18 February 2019

File Format
Name Freeze/Melt
Ontology
Extension(s) .F, .f, .lzc
Released ≤1991

Freeze is a file compression utility used from the command line in Unix-style operating systems. Melt is the corresponding decompressor. The format is sometimes called "frozen". It was developed by Leonid A. Broukhis. It is considered obsolete now in favor of gzip.

[edit] Format details

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).

[edit] Software

[edit] References

  • Man page (in NOAA site, which should know something about freezing!)
Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox