A free Macintosh Port of Info-ZIP'sZip and UnZipBy Dirk Haase, d_haase@sitec.netHome page: www.sitec.net/maczipMirror page:www.haase-online.de/dirk/maczip================================Abstract:---------MacZip is a cross-platform compatible tool that includesboth Zip (for compression) and UnZip (for extraction).Zip is a compression and file packaging utility for Unix,VMS, MSDOS, OS/2, Windows 9x, Windows NT, Atari, Macintosh,Amiga, Acorn RISC OS, and other systems.UnZip unpacks zip archives. The Zip and UnZip programs canprocess archives produced by PKZIP, and PKZIP and PKUNZIPcan work with archives produced by zip. Zip version 2.2 iscompatible with PKZIP 2.04.If you are new to MacZip please read first the file"ReadMe.1st".License:--------  Copyright (c) 1990-2001 Info-ZIP.  All rights reserved.  See the accompanying file LICENSE, version 2000-Apr-09 or later  (the contents of which are also included in unzip.h) for terms of use.  If, for some reason, all these files are missing, the Info-ZIP license  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.htmlRequirements------------MacZip requires at least System 7 and a Macintosh with aminimum of a Motorola 68020 or PowerPC 601 processor. Otherconfigurations may work but it is not tested at all.The application is distributed as a fat binary with bothregular 68K and native PowerPC versions included.Installation------------Move the executable(s) somewhere--for example, drag it (orthem) to your Applications folder.  For easy access, make analias in the Launcher Control Panel or directly on yourdesktop. The GUI is very simple. It was not my intention tomake a full-blown GUI, however I think it is comfortableenough to use it as regular tool.This port supports also Apple-event. So you can install itin your WWW-Browser as a helper app.For more Info about the contents of this package, take alook into the "macos/Contents" (or :macos:Contents) file.Some notes on how to rebuild the Macintosh applications canbe found in INSTALL.Usage:------Basically there are four ways to start MacZip:a) Drag'n Dropb) using the Dialog box (Menu: File -> Zip/Unzip):Please read the file "ReadMe.1st"for the description of the items a and b.c) Using the Command line (Menu: File->Command Line):   The Zip & UnZip tools are command line tools. So the   behavior is exactly the same like the Zip & UnZip tools on   Unix or Windows/DOS. This means, if you want to zip some   files, you have to write a command line like this: "zip   [switches] path_to_zip_archive path_to_files_folders"   - Go to "File", select "Command Line" and the     "MacZip Entry box" Dialog Box appears.   An example:   a: your zip may be created at           Macintosh HD:applications:archive.zip   b: your files may be found at           Macintosh HD:somewhere:my_folder_to_archive:*   Note: At the end of the path there must be a filename or         a wild card !   (see Footnotes: 1 wild card, 2 Mac path names)   So the command line should look like (one line!):   zip "Macintosh HD:applications:archive.zip" "Macintosh HD:somewhere:my_folder_to_archive:*"   - Click on "Enter" to start the task.   Since you can not set a default folder you have to enter   always a full qualified path names. Full-qualified path   names are path names including the Volume name ! (see   Footnote: 2 Mac path names)d) Using Applescript:There is only one additional event defined: "do_cmd". Youcan enter every valid command line. The first word must be"zip" or "unzip" to select the action (compress orextraction).See sample Applescript:    tell application "MacZip (PPC)"        activate        with timeout of 90000 seconds            do_cmd "zip -rjjN Volume:archive \"My Volume:*\" "        end timeout    end tellThis script opens MacZip, brings it to the foreground on theMac, starts the zip action with the command line: zip -rjjNVolume:archive "My Volume:*" .A short introduction is also available online:http://www.sitec.net/maczip/How-To-Do/It's possible to stop the run of Zip/Unzip with the wellknown shortcut [Command] + [.].---------------------------------------------------------------------------There are some Mac-specific switches available.Zip Module:       -df    [MacOS] Include only data-fork of files zipped into              the  archive.   Good for exporting files to foreign              operating-systems.  Resource-forks will be  ignored              at all.       -jj    [MacOS] record Fullpath (+ Volname).  The  complete              path  including  volume  will be stored. By default              the relative path will be stored.       -S     [MSDOS, OS/2, WIN32 and ATARI] Include  system  and              hidden files.              [MacOS]  Includes finder invisible files, which are              ignored otherwise.Unzip Module:       -E     [MacOS only] display contents of MacOS extra  field              during restore operation.       -i     [MacOS only] ignore filenames stored in MacOS extra              fields.  Instead,  the  most  compatible   filename              stored in the generic part of the entry's header is              used.       -J     [MacOS only] ignore MacOS extra fields.  All Macin-              tosh  specific  info  is  skipped.  Data-fork   and              resource-fork are restored as separate files.Select [File]->[Get Help on Zip/Unzip] for a complete listof switches.Limitations / Problems:-----------------------    - Aliases are not supported. I tried, but I got broken      aliases. This port will silently ignore all aliases.      It's on my to-do list for future releases.    - Zip needs much memory to compress many files: You may need      to increase the 'Preferred Size' in 'Get Info'. Values of 12      Megabytes or more are possible    - Unzip needs about 500 Kbytes of memory to unzip no matter      how many files were compressed and expanded.    - and finally one big macintosh-related problem:      This port has one weak point: It's based on path names.      As you may be already know: Path names are not unique on a Mac !      The main reason is that an attempt to implement support exact      saving of the MacOS specific internal file structures would      require a throughout rewrite of major parts of shared code,      probably sacrifying compatibility with other systems. I have      no solution at the moment. The port will just warn you if you      try zip from / to a volume which has a duplicate name.      MacZip has problems to find the archive or the files. My      (Big) recommendation: Name all your volumes with a unique      name and MacZip will run without any problem.Known Bugs:    - crypted files in a zip archive are sometimes corrupt:      I get an error message: invalid compressed data to inflate.      Appearance of this error is purely be chance: I did a small      test: Unzipping an archive containing 3589 files 56 files      fails to unzip, so about 1.5%. Root cause is completely      unclear to me :(I strongly recommend to test your archive (e.g. unzip -t archive).Zip Programs / Macintosh Extra-Data:-----------------------------------------A brief overview:Currently, as far as I know, there are 6 Zip programsavailable for the Macintosh platform. These programs build(of course) different variants of Zip files:    - Info-ZIP's first Port of Zip. Ported by Johnny Lee      This port is rather outdated and no longer supported (since 1992).      68K only. Only minimal Mac-info is stored      (Creator/Type, Finder attributes). Creator/Type: '????' / '????'      Until year 1998, only UnZip 5.32 survived.    - ZipIt by Tom Brown. This is Shareware and still supported I think.      ZipIt has a nice GUI, but I found it can't handle large Zip files      quite well. ZipIt compresses Macintosh files using the Mac Binary      format. So, transferring files to other platforms is not so easy.      Only minimal Mac-info is stored (Creator/Type, Finder attributes).      Mac filenames are changed to a most compatible filename.      Creator/Type: 'ZIP ' / 'ZIP '    - PKZIP/mac v2.03/210d. This is Shareware.      This Zip implementation for the Mac can be found on ASI's web site      (http://www.asizip.com/products/products.htm).  The name of this      program is misleading, it is NOT a product from PKWARE.  ASI's last      release version is v2.03, and they also offer a newer beta version      PKZIP/mac 210d. But even the Beta version is rather outdated (1995).      Only minimal Mac-info is stored (Creator/Type, Finder attributes).      The Zipfile format looks like incompatible to other platforms.      (More details about the compatibility issue can be found in      proginfo/3rdparty.bug!). Type: 'PKz1'      Mac filenames are restored without any change.    - Aladdin DropZip 1999, This is Shareware. Aladdin chose      the format of ZipIt. Therefore, it has the some drawbacks      like ZipIt.      Creator/Type: 'SITx' / 'ZIP '    - SmartZip 1.0 1999 - by Marco Bambini Vampire Software.      This is Shareware. SmartZip compresses Macintosh files using the      Mac Binary. Therefore, it has the same drawbacks like ZipIt.      Creator/Type: 'dZIP' / 'ZIP 'and finally:    - Info-ZIP's latest Port of Zip. MacZip 1.0. Ported by me :-)      It is supported (of course) and up to date. Full set of macintosh      info is stored: Creator/Type, Finder attributes, Finder comments,      MacOS 8.0 Folder settings, Icon/Folder Positions ...      Mac filenames are restored without any change.      Creator/Type: 'IZip' / 'ZIP 'Compatibility of my port; Extraction:   - Archives from Info-ZIP's first port (by Johnny Lee) are     still compatible.   - Extraction of ZipIt archives is supported. This support     is not complete: Filenames are correct but Directory names     are sometimes mangled to a DOS compatible form. Segmented     archives are not supported.   - PKZiP/mac archive files are extracted without resource-forks     and without any Finder info. I have no information about