LHARC A New Compression Program Bench Tests Against Phil Katz's PKZIP/PKUNZIP v. 092 by William J. Flynn Chandler, Arizona (602)864-0034 March 26, 1989 LHARC.EXE is a new compression/decompression program apparantly written by a Japanese programmer (see lharc.p contained in this .ZIP). After playing with it for a couple of days I'm convinced that it is truely worthy of some very serious consideration as an archival contender. As the following tables will illustrate, LHARC is much slower than Katz's PKZIP (even when PKZIP is set to the -ea4/-eb4 option). However, LHARC will consistently produce compression ratios 3% to 4% tighter than ZIP's. This would be pretty amazing in itself, but consider that LHARC is a Compression AND Decompression program AND makes self extracting archives, all in the 27K program - LHARC.EXE! I'm fairly certain that the .ZIP format will become the compression "standard" because it is well written, and has a lot of momentum behind it at the moment. But I would bet there's a lot of de-compiling going on at the Katz residence over this little hummer. 컫컴컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � File name � QEDIT.DOC � Q.EXE � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � Original Size � 251,444 � 274,080 � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � LHARC Size � 70,316 � 166,537 � � % of Orig. � 27.96% � 60.76% � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � LHARC Time � 84.3 sec � 73.1 sec � * 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � PKZIP Size � 79,158 � 208,697 � � % of Orig. � 31.48% � 76.14% � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � PKZIP Time � 10.1 sec � 17.8 sec � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � PKZIP -ea4/-eb4 � 77,369 � 177,051 � � Size � 30.77% � 64.6% � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � PKZIP -ea4/-eb4 � � � � Time � 40.8 sec � 40.5 sec � 曲袴袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴妄袴袴袴袴袴袴袴袴袴袴� � LHARC Self-Extract. � � � � Size � 71,638 � 167,859 � 賈袴袴袴袴袴袴袴袴袴袴袴鳩袴袴袴袴袴袴袴袴袴袴鳩袴袴袴袴袴袴袴袴袴袴� * All times run on an 8MHz AT