W8SDZ@SIMTEL20.ARPA (Keith Petersen) (11/15/86)
> I had retrieved a copy of <CPM.CCP>conix.lbr and found many of > the files had .DZC or .CZM extensions. Can you tell me what > compression scheme was used to squeeze these files? > Also, if there is some handy CP/M-80 utility to unsqueeze them, > could you pass its name along as well? Yes, there is a program called CRUNCH (and companion UNCRunch) which does Lempel-Zev-Welch style file compression on CP/M-80. It is far more efficient than SQueeze/UnSQueeze which uses the Hoffman algorithm. The efficiency of CRUNCH exceeds that of MSDOS`s ARC512.EXE utility. [Flame on] - Too bad the authors of LU and NULU never released the source code. We **COULD** have had a combined LBR/CRUNCH which would have been better than MSDOS's ARC files. Another stifling of software expansion/development caused by those who will not share the basic tools we need to keep CP/M alive. [end of flame]. Filename Type Bytes CRC Directory PD:<CPM.SQUSQ> CRUNCH20.DAT.1 ASCII 1984 E4B5H <--performance info CRUNCH22.LBR.1 BINARY 26880 FAB1H <--Z80 crunch/uncrunch (no source code available) --Keith