CrLZH

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Revision as of 16:10, 29 March 2016 (view source) Jsummers (Talk | contribs) ← Older edit		Revision as of 13:25, 2 December 2019 (view source) Effect2 (Talk | contribs) (Added released (taken from page body); added link) Newer edit →
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	|subcat=Compression		|subcat=Compression
	|extensions={{ext|?y?}}, {{ext|yyy}}		|extensions={{ext|?y?}}, {{ext|yyy}}
		+	|released=Late 1980s
	}}		}}
−	[[CrLZH]] (often  referred to as just "LZH", but not to be confused with the format used for .lzh files) was a method of compressing single files used on [[CP/M]], devised by Roger Warren in the late 1980s. It came later than [[Squeeze]] and [[Crunch]] and generally achieved better compression than those formats. LZH files occurred standalone and as members in [[LBR]] archives. The underlying compression is based on that used by [[LHArc]].	+	[[CrLZH]] (often  referred to as just "LZH", but not to be confused with the format used for [[LZH|.lzh]] files) was a method of compressing single files used on [[CP/M]], devised by Roger Warren in the late 1980s. It came later than [[Squeeze]] and [[Crunch]] and generally achieved better compression than those formats. LZH files occurred standalone and as members in [[LBR]] archives. The underlying compression is based on that used by [[LHArc]].
	Similar to [[Squeeze]] and [[Crunch]], these files were signified in CP/M's 8.3 filename format by replacing the middle letter of the extension with Y (.?Y?), with the extension .YYY used for corner cases such as a blank extension.		Similar to [[Squeeze]] and [[Crunch]], these files were signified in CP/M's 8.3 filename format by replacing the middle letter of the extension with Y (.?Y?), with the extension .YYY used for corner cases such as a blank extension.

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Revision as of 13:25, 2 December 2019

File Format
Name	CrLZH
Ontology	Electronic File Formats Compression CrLZH
Extension(s)	.?y?, .yyy
Released	Late 1980s

CrLZH (often referred to as just "LZH", but not to be confused with the format used for .lzh files) was a method of compressing single files used on CP/M, devised by Roger Warren in the late 1980s. It came later than Squeeze and Crunch and generally achieved better compression than those formats. LZH files occurred standalone and as members in LBR archives. The underlying compression is based on that used by LHArc.

Similar to Squeeze and Crunch, these files were signified in CP/M's 8.3 filename format by replacing the middle letter of the extension with Y (.?Y?), with the extension .YYY used for corner cases such as a blank extension.

Tools

• CFX (DOS/Unix)
• lbrate by Russell Marks, c. 2001 (Unix, GPL2)
• On CP/M (or emulators):
  • The original tools were those in the CRLZH distribution, e.g. CRLZH20.LBR
  • The later LT31 deals with extracting from all of Squeeze, Crunch, CrLZH and LBR formats. Widely available in CP/M archives, e.g. LT31.LBR

References

• Some format information is in LZHREL.DOC shipped with CRLZH20.LBR
  • An extracted copy is provided here.
  • Note that the file header follows a similar/compatible structure to Squeeze and Crunch.