Latest and Greatest ARC (with squashing) pre-release (1/9)
Howard Chu
hyc at umix.cc.umich.edu
Thu Apr 14 15:55:08 AEST 1988
Howdy... I'm calling this a pre-release, but there's nothing wrong with
the included code. (Assuming you're on a BSD style machine.) It may even
work on a Sys V flavor machine; I don't know. When I find out for certain,
the resulting code will be posted to comp.sources.misc. (I hope. Depends
on Brandon, I guess.) Meanwhile, I've sent a copy of this to Jon Zeeff,
(umix!b-tech!zeeff) who has promised to test this for me on his Sys V
machine. (Got that, Jon? If there are any delays, the entire alt world
will blame it on you... }-) Anyway... Cut all this crud out, cat all 9
pieces together, unshar it, and read the Readme file. You should be able
to just type make, walk away for a few minutes, and come back to find a
shiny new arc program on your machine... While it's nearly identical to
the MSDOS program, even if you're familiar with how to use ARC you should
read my notes on the two new options... neuf'o'dix. Further info in the
Readme. byefornow
# This is a shell archive.
# Remove everything above and including the cut line.
# Then run the rest of the file through sh.
#----cut here-----cut here-----cut here-----cut here-----
#!/bin/sh
# shar: Shell Archiver
# Run the following text with /bin/sh to create:
# Readme
# Manifest
# Make.tws
# Makefile
# Arc.doc
# Arcinfo
# arc.c
# arc.h
# arcadd.c
# arccode.c
# arccvt.c
# arcdata.c
# arcdel.c
# arcdos.c
# arcext.c
# arcio.c
# arclst.c
# arclzw.c
# arcmatch.c
# arcmisc.c
# arcpack.c
# arcrun.c
# arcs.h
# arcsqs.c
# arcsvc.c
# arctst.c
# arcunp.c
# arcusq.c
# dtime.c
# dtimep.lex
# lexedit.sed
# lexstring.c
# libtws.3
# tws.h
# This archive created: Thu Apr 14 00:30:56 1988
echo shar: extracting Readme '(4232 characters)'
sed 's/^XX//' << \SHAR_EOF > Readme
XXGreetings,
XX herein you should be pleased to find the complete sources for the
XXlatest and greatest version of ARC, based on the sources for version 5.20
XXof the MSDOS ARC program. The patches to the previous release, 5.12, with
XXsquashing algorithm, have also been applied here. The code is known to
XXwork on a Sun 3 running SunOS 3.4, Apollo DN3000 running SR9.7 DOMAIN/IX,
XXVax 750 running 4.3BSD, and IBM 3090 running MTS. I shall probably begin
XXporting to my Atari ST in a few days as well...
XX Also included is a detailed description of the format of a .ARC
XXfile directory entry, in the file named Arcinfo. Could be useful if you're
XXtrying to port ARC to any more esoteric systems...
XX One final necessary inclusion: sources for libtws.a, which was
XXposted a long time ago to mod.sources as part of a package he called
XX"phoon" - a program that calculated and displayed the PHase of the mOON.
XXThe only thing I use the time routines for here is to convert an expanded
XXdate/time back into a Unix style time value, for keeping file modification
XXtimes straight.
XX I have not written a man page; if you need docs for this program,
XXsee the docs for ARC 5.20 on a PC. Operation is pretty much identical,
XXexcept as noted below.
XX
XXA necessary legal note: ARC is copywritten by Systems Enhancement
XXAssociates. You may freely distribute the ARC program as long as you do not
XXcharge for distribution. The comments in the code indicate that the program
XXis intended to be distributed in unmodified form (i.e., lots of people will
XXget very angry at you if you rewrite a banner to claim that you wrote the
XXprogram, or if you do something vile like insert a virus.). This is a moot
XXpoint, really, since the sources were made public by the SEA folk to allow
XX(heck, encourage!) other people to use and modify the code. (The point is
XXmoot only in this context - I'm not distributing binary executables...)
XXOrdinarily, if you liked this program, you'd send a registration fee to SEA
XXand they'd promise to give you technical support. The registration form is
XXincluded here, at the end of the doc file. I suppose you can send them your
XXmoney if you want, after using this code. I don't see why, though, since
XXthey didn't write the non-MSDOS code, and probably won't provide any
XXsupport for it. (Actually, I suppose it would be very easy for them to pick
XXthis up and then offer to support non-MSDOS users. Whatever...) In any case,
XXThey didn't write all of what you're about to see, and neither did I, but I
XXsuspect neither the SEA folk, myself, or any of the many others who have
XXinvested time in this program would appreciate it much if you were to charge
XXanything for distributing this code. neuf'o'dix.
XX
XXThings to note - if you specify the "q" (use squashing) option, ARC will
XXnot bother trying the other compression methods at all. This may or may
XXnot be desirable. (A small speed gain, but Squashing isn't always better
XXthan Crunching...) Also, as of version 5.20, ARC no longer uses the Huffman
XXSqueeze algorithm for compression. This is also a speed gain, since it no
XXlonger spends time performing 3 different compression methods simultaneously
XXand choose the best. (Now it only tries two at most.)
XX
XXAnother thing - this version, unlike for MSDOS, distinguishes between text
XXand binary files. The default is text, which will strip CRs from files
XXupon extraction, and will insert them before LFs upon storage. Should make
XXsending text files between machines a little less painful than before.
XX(On a 370 machine it also translates from and to ASCII/EBCDIC, so all
XXfiles are stored internally in an MSDOS usable format, i.e, ASCII text,
XXCR/LF line terminator...)
XX
XXTo compile all this stuff... Edit Make.tws (shouldn't need to change anything
XXhere, really.) Edit arc.h. I've never run this on a pure System V Unix, so
XXI can't say how it'll behave, but it should still compile with BSD defined.
XXAfter that, just type make and wait a while... Ok... Well, I've had this
XXfor a while, and it works for me, but if somehow I've goofed, let me know.
XX
XX /
XX /_ , ,_. Howard Chu
XX/ /(_/(__ University of Michigan
XX / Computing Center College of LS&A
XX ' Unix Project Information Systems
SHAR_EOF
if test 4232 -ne "`wc -c Readme`"
then
echo shar: error transmitting Readme '(should have been 4232 characters)'
fi
echo shar: extracting Manifest '(2051 characters)'
sed 's/^XX//' << \SHAR_EOF > Manifest
XXContents of this distribution....
XX 55115 Apr 14 00:08 Arc.doc Docs for original PC ARC 5.20
XX 5577 Apr 11 19:15 Arcinfo Description of .ARC file format
XX 1323 Apr 11 19:10 Make.tws Makefile for the time routine library
XX 1697 Apr 11 18:48 Makefile Makefile for ARC
XX 2051 Apr 11 19:16 Manifest This file
XX 4232 Apr 11 19:50 Readme Brief description of this package
XX 10348 Apr 11 18:57 arc.c Main routine, option parser...
XX 3115 Apr 11 17:40 arc.h System dependencies, externs
XX 9205 Apr 11 17:43 arcadd.c Top level routine for adding to archive
XX 1314 Apr 8 16:43 arccode.c Code for file encryption/decryption
XX 3800 Apr 11 17:45 arccvt.c Convert from old to new packing method
XX 1838 Apr 11 17:46 arcdata.c Declarations of externs from arc.h
XX 2077 Apr 8 16:43 arcdel.c delete files from archive
XX 5048 Apr 11 17:46 arcdos.c OS specific file management routines
XX 5231 Apr 11 17:52 arcext.c Top level routine for extraction
XX 7950 Apr 11 17:54 arcio.c OS specific low-level I/O routines
XX 4534 Apr 11 17:56 arclst.c list contents of archive
XX 23283 Apr 11 18:06 arclzw.c low-level lempel-ziv-welch compression
XX 3403 Apr 11 18:14 arcmatch.c pattern matching routines
XX 11060 Apr 11 18:20 arcmisc.c OS specific miscellaneous functions
XX 7219 Apr 11 18:50 arcpack.c mid-level compression code
XX 3287 Apr 8 16:44 arcrun.c run files from archive
XX 1832 Dec 19 03:52 arcs.h Declaration of .ARC header format
XX 11230 Apr 11 18:32 arcsqs.c low-level squash code
XX 5470 Apr 11 18:35 arcsvc.c .ARC file utilities
XX 1437 Apr 8 16:44 arctst.c test archive integrity
XX 5622 Apr 11 18:51 arcunp.c mid-level extraction code
XX 2678 Apr 11 18:40 arcusq.c low-level Huffman unSqueezer
XX 9035 Apr 11 19:10 dtime.c sources for the time routine library...
XX 7327 Apr 11 19:11 dtimep.lex
XX 356 Apr 11 19:12 lexedit.sed
XX 3765 Apr 11 19:12 lexstring.c
XX 2241 Apr 11 19:13 libtws.3 man page for the time routine library
XX 2999 Aug 13 1987 tws.h
SHAR_EOF
if test 2051 -ne "`wc -c Manifest`"
then
echo shar: error transmitting Manifest '(should have been 2051 characters)'
fi
echo shar: extracting Make.tws '(1323 characters)'
sed 's/^XX//' << \SHAR_EOF > Make.tws
XX# Makefile for phoon, deltime, parsetime, and libtws (stolen from mh).
XX
XX# Valid options:
XX# BSD42 Set this if your system is BSD 4.2 or later.
XX# SYS5 Set this if your system is System V.
XX# EUROPE Makes nn/nn/nn mean dd/mm/yy instead of mm/dd/yy.
XX# ATZ This has something to do with alpha-numeric time zones.
XX# DSTXXX This has something to do with daylight savings time.
XX# HUJI I don't
XX# INETONLY know what
XX# LEXDEBUG the rest of these
XX# ONECASE do.
XX#
XX# Original posted to mod.sources by Jef Poskanzer. Cannibalized for use
XX# with ARC by Howard Chu.
XXOPTIONS = -DBSD42 -DATZ -DDSTXXX -DONECASE
XX
XX
XXCC = cc
XXCFLAGS = -O $(OPTIONS)
XXLDFLAGS = -ns
XX
XXlibtws.a: dtime.o dtimep.o lexstring.o
XX ar r libtws.a dtime.o dtimep.o lexstring.o
XX# The following amusing bullshit makes sure that ranlib
XX# gets executed if it is present, no matter which shell
XX# make uses. If there's a better way to do this, someone
XX# please tell me!
XX -if test -r /usr/bin/ranlib ; then ranlib libtws.a ; fi
XX -if ( -r /usr/bin/ranlib ) ranlib libtws.a
XX
XXdtime.o: dtime.c tws.h
XX
XXdtimep.o: dtimep.c tws.h
XX
XXdtimep.c: dtimep.lex
XX lex -nt dtimep.lex | sed -f lexedit.sed > dtimep.c
XX
XXlexstring.o: lexstring.c
XX $(CC) $(CFLAGS) -c lexstring.c
SHAR_EOF
if test 1323 -ne "`wc -c Make.tws`"
then
echo shar: error transmitting Make.tws '(should have been 1323 characters)'
fi
echo shar: extracting Makefile '(1697 characters)'
sed 's/^XX//' << \SHAR_EOF > Makefile
XX#
XX# Makefile for Hack-attack 1.3
XX# VAX 11/780 BSD4.2 "ARC" utility
XX#
XX# Originals from Dan Lanciani, James Turner, and others...
XX#
XX# Modified to support squashing, also added targets for the time routine
XX# library. -- Howard Chu, hyc at umix.cc.umich.edu, 4-11-88
XX#
XXCFLAGS = -O
XX
XXOBJS = arc.o arcadd.o arccode.o arccvt.o arcdata.o arcdel.o arcdos.o \
XXarcext.o arcio.o arclst.o arclzw.o arcmatch.o arcpack.o arcrun.o \
XXarcsqs.o arcsvc.o arctst.o arcunp.o arcusq.o arcmisc.o
XX
XX
XXSRCS = arc.c arcadd.c arccode.c arccvt.c arcdata.c arcdel.c arcdos.c \
XXarcext.c arcio.c arclst.c arclzw.c arcmatch.c arcpack.c arcrun.c \
XXarcsqs.c arcsvc.c arctst.c arcunp.c arcusq.c arcmisc.c
XX
XXarc: ${OBJS} libtws.a
XX cc ${CFLAGS} -o arc ${OBJS} libtws.a
XXarc.o: arc.h
XX cc ${CFLAGS} -c arc.c
XXarcadd.o: arc.h
XX cc ${CFLAGS} -c arcadd.c
XXarccode.o: arc.h
XX cc ${CFLAGS} -c arccode.c
XXarccvt.o: arc.h
XX cc ${CFLAGS} -c arccvt.c
XXarcdata.o: arc.h
XX cc ${CFLAGS} -c arcdata.c
XXarcdel.o: arc.h
XX cc ${CFLAGS} -c arcdel.c
XXarcdir.o: arc.h
XX cc ${CFLAGS} -c arcdir.c
XXarcdos.o: arc.h tws.h
XX cc ${CFLAGS} -c arcdos.c
XXarcext.o: arc.h
XX cc ${CFLAGS} -c arcext.c
XXarcio.o: arc.h
XX cc ${CFLAGS} -c arcio.c
XXarclst.o: arc.h
XX cc ${CFLAGS} -c arclst.c
XXarclzw.o: arc.h
XX cc ${CFLAGS} -c arclzw.c
XXarcmatch.o: arc.h
XX cc ${CFLAGS} -c arcmatch.c
XXarcmisc.o: arc.h
XX cc ${CFLAGS} -c arcmisc.c
XXarcpack.o: arc.h
XX cc ${CFLAGS} -c arcpack.c
XXarcrun.o: arc.h
XX cc ${CFLAGS} -c arcrun.c
XXarcsqs.o: arc.h
XX cc ${CFLAGS} -c arcsqs.c
XXarcsvc.o: arc.h
XX cc ${CFLAGS} -c arcsvc.c
XXarctst.o: arc.h
XX cc ${CFLAGS} -c arctst.c
XXarcunp.o: arc.h
XX cc ${CFLAGS} -c arcunp.c
XXarcusq.o: arc.h
XX cc ${CFLAGS} -c arcusq.c
XXarc.h: arcs.h
XX touch arc.h
XX
XXlibtws.a:
XX make -f Make.tws libtws.a
SHAR_EOF
if test 1697 -ne "`wc -c Makefile`"
then
echo shar: error transmitting Makefile '(should have been 1697 characters)'
fi
echo shar: extracting Arc.doc '(55115 characters)'
sed 's/^XX//' << \SHAR_EOF > Arc.doc
XX
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XX ARC
XX
XX File Archive Utility
XX Version 5.20
XX
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XX (C)COPYRIGHT 1985,86
XX by
XX System Enhancement Associates, Inc.
XX ALL RIGHTS RESERVED
XX
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XX
XXThis document describes version 5.20 of the ARC file
XXutility, which was created by System Enhancement
XXAssociates, Inc. in October of 1986.
XX
XX
XX TABLE OF CONTENTS
XX
XX
XX
XX_______ ____
XX
XX
XXIntroduction .................................... 1
XXUsing ARC ....................................... 3
XXARC commands .................................... 5
XX Adding files ................................ 5
XX Extracting files ............................ 7
XX Deleting files .............................. 8
XX Listing archive entries ..................... 8
XX Running files ............................... 10
XX Printing files .............................. 11
XX Testing an archive .......................... 11
XX Converting an archive ....................... 12
XXARC options ..................................... 13
XX Suppressing compression ..................... 13
XX Backup retention ............................ 14
XX Message suppression ......................... 15
XX Encryption/Decryption ....................... 17
XXRAMdisk support ................................. 18
XXMARC ............................................ 19
XXARCE ............................................ 20
XXVersion numbers ................................. 21
XXCommon questions and answers .................... 22
XXMaintenance contracts ........................... 24
XXRevision history ................................ 25
XX Changes in version 3 ........................ 25
XX Changes in version 4 ........................ 25
XX Changes in version 4.1 ...................... 26
XX Changes in version 4.3 ...................... 26
XX Changes in version 4.4 ...................... 27
XX Changes in version 4.5 ...................... 27
XX Changes in version 5.0 ...................... 28
XX Changes in version 5.1 ...................... 29
XX Changes in version 5.2 ...................... 30
XXProgram history and credits ..................... 31
XXBulletin boards ................................. 33
XXSite licenses ................................... 34
XX
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XX
XX
XX INTRODUCTION
XX
XX
XX
XXARC is the copyrighted property of System Enhancement
XXAssociates, Inc. You are granted a limited license to
XXuse ARC, and to copy it and distribute it, provided
XXthat the following conditions are met:
XX
XX1) No fee may be charged for such copying and
XX distribution.
XX
XX2) ARC may ONLY be distributed in its original,
XX unmodified state.
XX
XX ___
XX part of any commercial product or service without
XX the express written permission of System
XX Enhancement Associates.
XX
XX
XXContributions for the use of this program will be
XXappreciated, and should be sent to:
XX
XX System Enhancement Associates, Inc.
XX 21 New Street, Wayne NJ 07470
XX
XXYou may not use this product in a commercial
XXenvironment or a governmental organization without
XXpaying a license fee of $35. Site licenses and
XXcommercial distribution licenses are available. A
XXprogram disk and printed documentation are available
XXfor $50. See the order form enclosed with this manual
XXfor more details.
XX
XX
XX
XXARC is user supported software. This means that you
XXmay copy it freely and give the copies away to anyone
XXyou wish, at no cost. They are in turn requested to
XXsend in a contribution if they decide to use it.
XX
XXThe user supported software concept (often referred to
XX _________
XXcost. The cost of offering a new product by
XXconventional means is staggering, and hence dissuades
XXmany independent authors and small companies from
XXdeveloping and promoting their ideas. User supported
XXsoftware is an attempt to develop a new marketing
XXchannel, where products can be introduced at low cost.
XX
XX
XX
XX
XXARC Page 1
XX If user supported software works, then everyone will
XXbenefit. The user will benefit by receiving quality
XXproducts at low cost, and by being able to "test
XXdrive" software thoroughly before purchasing it. The
XXauthor benefits by being able to enter the commercial
XXsoftware arena without first needing large sources of
XXventure capital.
XX
XXBut it can only work with your support. We're not
XXjust talking about ARC here, but about all user
XXsupported software. If you obtain a user supported
XXprogram from a friend or colleague, and are still
XXusing it after a couple of weeks, then it is obviously
XXworth something to you, and a contribution should be
XXsent.
XX
XX
XX
XXAnd now, back to ARC:
XX
XXARC is used to create and maintain file archives. An
XXarchive is a group of files collected together into
XXone file in such a way that the individual files may
XXbe recovered intact.
XX
XXARC is different from other archive and library
XXutilities in that it automatically compresses the
XXfiles being archived, so that the resulting archive
XXtakes up a minimum amount of space.
XX
XXWhen ARC is used to add a file to an archive it
XXanalyzes the file to determine which of three storage
XXmethods will result in the greatest savings. These
XXthree methods are:
XX
XX1) No compression; the file is stored as is.
XX
XX2) Repeated-character compression; repeated sequences
XX of the same byte value are collapsed into a three-
XX byte code sequence.
XX
XX3) Dynamic Lempel-Zev compression; the file is stored
XX as a series of variable size bit codes which
XX represent character strings, and which are created
XX "on the fly".
XX
XXNote that since one of the three methods involves no
XXcompression at all, the resulting archive entry will
XXnever be larger than the original file.
XX
XX
XX
XX
XX
XXARC Page 2
XX USING ARC
XX
XX
XX
XXARC is invoked with a command of the following format:
XX
XX ARC <x> <arcname> [<template> . . .]
XX
XXWhere:
XX
XX <x> is an ARC command letter (see below), in
XX either upper or lower case.
XX
XX <arcname> is the name of the archive to act on,
XX with or without an extension. If no extension is
XX supplied, then ".ARC" is assumed. The archive
XX name may include path and drive specifiers.
XX
XX <template> is one or more file name templates.
XX The "wildcard" characters "*" and "?" may be used.
XX A file name template may include a path or drive
XX specifier, though it isn't always meaningful.
XX
XX
XXIf ARC is invoked with no arguments (by typing "ARC",
XXand pressing "enter"), then a brief command summary is
XXdisplayed.
XX
XX
XX
XXFollowing is a brief summary of the available ARC
XXcommands:
XX
XX a = add files to archive
XX m = move files to archive
XX u = update files in archive
XX f = freshen files in archive
XX d = delete files from archive
XX x,e = extract files from archive
XX r = run files from archive
XX p = copy files from archive to standard output
XX l = list files in archive
XX v = verbose listing of files in archive
XX t = test archive integrity
XX c = convert entry to new packing method
XX
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XXARC Page 3
XX Following is a brief summary of the available ARC
XXoptions, which may alter how a command works:
XX
XX b = retain backup copy of archive
XX s = suppress compression (store only)
XX w = suppress warning messages
XX n = suppress notes and comments
XX o = overwrite existing files when extracting
XX g = encode or decode archive entry
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XXARC Page 4
XX ARC COMMANDS
XX
XX
XX
XXThis section describes each of the commands. ARC will
XXaccept any one command at a time. If no commands are
XXgiven, then a brief command list is displayed.
XX
XX
XX
XX____________
XX
XXFiles are added to an archive using the "A" (Add), "M"
XX(Move), "U" (Update), or "F" (Freshen) commands. Add
XXalways adds the file. Move differs from Add in that
XXthe source file is deleted once it has been added to
XXthe archive.
XX
XXUpdate differs from Add in that the file is only added
XXif it is not already in the archive, or if it is newer
XXthat the corresponding entry in the archive.
XX
XXFreshen is similar to Update, except that new files
XXare not added to the archive; only files already in
XXthe archive are updated.
XX
XX
XXFor example, if you wish to add a file named
XX"TEST.DAT" to an archive named "MY.ARC", you would use
XXa command of the form:
XX
XX ARC a my test.dat
XX
XXIf you wanted to add all files with a ".C" extension,
XXand all files named "STUFF" to an archive named
XX"JUNK.ARC", you could type:
XX
XX ARC a junk *.c stuff.*
XX
XXIf you wanted to move all files in your current
XXdirectory into an archive named "SUM.ARC", you could
XXuse a command of the form:
XX
XX ARC m sum *.*
XX
XXIf you have an archive named "TEXT.ARC", and you
XXwanted to add to it all of your files with an
XXextension of ".TXT" which have been created or changed
XXsince they were last archived, then you would type:
XX
XX ARC u text *.txt
XX
XX
XX
XXARC Page 5
XX If you have a bunch of files in your current
XXdirectory, with backup copies being stored in an
XXarchive named "SAFE.ARC", then if you wanted to make
XXsure that every file in the archive is the latest
XXversion of that file, you would type:
XX
XX ARC f safe
XX
XX
XXA word about Update and Freshen: These are similar in
XXthat they look at the date and time of last change on
XXthe file, and only add it if the file has been changed
XXsince it was last archived. They differ in that
XXUpdate will add new files, while Freshen will not.
XX
XXIn other words, Update looks for the files on disk,
XXand adds them if they are new or have changed, while
XXFreshen looks in the archive, and tries to update the
XXfiles which are already there.
XX
XX
XXArchive entries are always maintained in alphabetic
XXorder. Archive entries may not have duplicate names.
XXIf you add a file to an archive that already contains
XXa file by that name, then the existing entry in the
XXarchive is replaced. Also, the archive itself and its
XXbackup will not be added.
XX
XXYou may also add a file which is in a directory other
XXthan your current directory. For example, it is
XXperfectly legal to type:
XX
XX ARC a junk c:\dustbin\stuff.txt
XX
XXYou cannot add two files with the same name. In other
XXwords, if you have a file named "C:\DUSTBIN\STUFF.TXT"
XXand another file named "C:\BUCKET\STUFF.TXT", then
XXtyping:
XX
XX arc a junk c:\dustbin\*.* c:\bucket\*.*
XX
XXwill not work.
XX
XX
XXARC does not save the path name. In other words, if
XXyou specify a drive and/or path when adding a file,
XXonly the actual file name is stored in the archive.
XX
XX
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XXARC Page 6
XX ARC will never add an archive to itself, nor will it
XXadd the temporary copy or a backup copy of the
XXarchive.
XX
XX
XXAn interesting note: It has been brought to our
XXattention that BASIC programs compress to a smaller
XX ___
XXconcerned with space than speed, you may wish to
XXconvert your BASIC programs to ASCII form before
XXadding them to an archive. Your BASIC manual should
XXgive instructions on how to do this.
XX
XX
XX
XX________________
XX
XXArchive entries are extracted with the "E" (Extract)
XXand "X" (eXtract) commands. For example, if you had
XXan archive named "JUNK.ARC", and you wanted all files
XXin it with an extension of ".TXT" or ".DOC" to be
XXrecreated on your disk, you could type:
XX
XX ARC x junk *.txt *.doc
XX
XXIf you wanted to extract all of the files in an
XXarchive named "JUNK.ARC", you could simply type:
XX
XX ARC x junk
XX
XXWhatever method of file compression was used in
XXstoring the files is reversed, and uncompressed copies
XXare created in the current directory.
XX
XXYou can also specify a path name, in which case the
XXdecompressed copy is placed in the specified
XXdirectory. For example, if you had an archive named
XX"JUNK.ARC", and you wanted all files in it with an
XXextension of ".TXT" to be placed in the directory
XX"C:\WASTE\LAND", then you could type:
XX
XX ARC x junk c:\waste\land\*.txt
XX
XXIf you wanted to put the file "TRASH.TXT" on your A:
XXdrive, and the file "LITTER.TXT" on your B: drive, you
XXcould type:
XX
XX ARC x junk a:trash.txt b:litter.txt
XX
XX
XX
XX
XX
XX
XXARC Page 7
XX If you give more than one path for a file, then only
XXthe first one is used. For example, if you typed:
XX
XX ARC x junk a:trash.txt b:trash.txt
XX
XXthen TRASH.TXT will be placed on your A: drive.
XX
XX
XX
XX______________
XX
XXArchive entries are deleted with the "D" (Delete)
XXcommand. For example, if you had an archive named
XX"JUNK.ARC", and you wished to delete all entries in it
XXwith a filename extension of ".C", you could type:
XX
XX ARC d junk *.c
XX
XX
XX
XX_______________________
XX
XXYou can obtain a list of the contents of an archive by
XXusing the "L" (List) command or the "V" (Verbose list)
XXcommand. For example, to see what is in an archive
XXnamed "JUNK.ARC", you could type:
XX
XX ARC l junk
XX
XXIf you are only interested in files with an extension
XXof ".DOC", then you could type:
XX
XX ARC l junk *.doc
XX
XX
XXARC prints a short listing of an archive's contents
XXlike this:
XX
XX Name Length Date
XX ============ ======== =========
XX ALPHA.TXT 6784 16 May 85
XX BRAVO.TXT 2432 16 May 85
XX COCO.TXT 256 16 May 85
XX ==== ========
XX Total 3 9472
XX
XX
XX"Name" is simply the name of the file.
XX
XX
XX
XX
XX
XX
XXARC Page 8
XX "Length" is the unpacked file length. In other words,
XXit is the number of bytes of disk space which the file
XXwould take up if it were extracted.
XX
XX"Date" is the date on which the file had last been
XXmodified, as of the time when it was added to the
XXarchive.
XX
XX"Total" is pretty obvious, I think.
XX
XX
XXARC prints a verbose listing of an archive's contents
XXlike this:
XX
XXName Length Stowage SF Size now Date Time CRC
XX============ ======== ======== ==== ======== ========= ====== ====
XXALPHA.TXT 6784 Crunched 35% 4413 16 May 85 11:53a 8708
XXBRAVO.TXT 2432 Crunched 41% 1438 16 May 85 11:53a 5BD6
XXCOCO.TXT 256 Packed 5% 244 16 May 85 11:53a 3AFB
XX ==== ======== ==== ========
XXTotal 3 9472 27% 6095
XX
XX
XX"Name", "Length", and "Date" are the same as for a
XXshort listing.
XX
XX"Stowage" is the compression method used. The
XXfollowing compression methods are currently known:
XX
XX -- No compression.
XX
XX Packed Runs of repeated byte values are
XX collapsed.
XX
XX Crunched Lempel-Zev compression technique
XX employed.
XX
XX Squeezed Huffman encoding compression
XX technique, as employed by an
XX earlier version of ARC.
XX
XX"SF" is the stowage factor. In other words, it is the
XXpercentage of the file length which was saved by
XXcompression. The total stowage factor is the stowage
XXfactor for the archive as a whole, not counting
XXarchive overhead.
XX
XX"Size now" is the number of bytes the file is
XXoccupying while in the archive.
XX
XX
XX
XX
XX
XXARC Page 9
XX "Time" is the time of last modification, and is
XXassociated with the date of last modification.
XX
XX"CRC" is the CRC check value which has been stored
XXwith the file. Another CRC value will be calculated
XXwhen the file is extracted or tested to ensure data
XXintegrity. There is no especially good reason for
XXdisplaying this value.
XX
XX
XX
XX_____________
XX
XXArchive entries may be run without being extracted by
XXuse of the "R" (Run) command. For example, if you had
XXan archive named "JUNK.ARC" which contained a file
XXnamed "LEMON.COM", which you wished to run, you could
XXtype:
XX
XX ARC r junk lemon
XX
XXYou can run any file from an archive which has an
XXextension of ".COM", ".EXE", ".BAT", or ".BAS". You
XXdo not have to specify the extension, but all matching
XXfiles are run if you do not. In other words, if you
XXhad an archive named "JUNK.ARC" which contained the
XXfiles "LEMON.COM", "LEMON.EXE", and "LEMON.BAS", and
XXyou typed:
XX
XX ARC r junk lemon
XX
XXThen all three programs will be run. You can avoid
XXthis by specifying an extension in this case.
XX
XXYou can give arguments to the program you are running
XXby appending them to the command line. For example,
XXif you have an archive named "JUNK.ARC" which contains
XXa program named "LEMON.COM", and you wanted to run it
XXgiving it the argument "JUICE", you would type:
XX
XX ARC r junk lemon juice
XX
XXYou will need a fair amount of memory to run a program
XXfrom an archive. It probably cannot be done with less
XXthan 256k.
XX
XX
XX
XX
XX
XX
XX
XX
XX
XXARC Page 10
XX In practice, the file to be run is extracted, run, and
XXthen deleted. In other words, the above example is
XXequivalent to:
XX
XX ARC x junk lemon.com
XX lemon juice
XX erase lemon.com
XX
XXIf you have an archive which contains a program that
XXyou will be running often, then you should probably
XXextract the program from the archive and use it
XXnormally.
XX
XX
XX
XX______________
XX
XXArchive entries may be examined with the "P" (Print)
XXcommand. This works the same as the Extract command,
XXexcept that the files are not created on disk.
XXInstead, the contents of the files are written to
XXstandard output. For example, if you wanted to see
XXthe contents of every ".TXT" file in an archive named
XX"JUNK.ARC", but didn't want them saved on disk, you
XXcould type:
XX
XX ARC p junk *.txt
XX
XXIf you wanted them to be printed on your printer
XXinstead of on your screen, you could type:
XX
XX ARC p junk *.txt >prn
XX
XX
XX
XX__________________
XX
XXThe integrity of an archive may be tested by use of
XXthe "T" (Test) command. This checks to make sure that
XXall of the file headers are properly placed, and that
XXall of the files are in good shape.
XX
XXThis can be very useful for critical archives, where
XXdata integrity must be assured. When an archive is
XXtested, all of the entries in the archive are unpacked
XX(without saving them anywhere) so that a CRC check
XXvalue may be calculated and compared with the recorded
XXCRC value.
XX
XX
XX
XX
XX
XX
XXARC Page 11
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