Freeze/Melt

Revision as of 12:14, 10 July 2020

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.

Disambiguation

For another format named Freeze, see Freeze!.

The LHarc/LHA software uses the terms "Freezing" and "Melting" during operation, though its format is not related.

For more icy formats, see the ICE disambiguation page.

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).

Software

• Source code
• Versions 2.1–2.5 were posted to the comp.sources.misc Usenet group in 1991–1993:
  • [1], [2], [3]
  • Source Code CD ROM (Walnut Creek) (March 1994)

References

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