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@@ -0,0 +1,234 @@ +Zip 3.0 is the first Zip update adding large file support. For now Zip 2.3x +remains available and supported, but users should switch to this new release. + +Testing for Zip 3.0 has focused mainly on Unix, VMS, Max OS X, and Win32, +and some other ports may not be fully supported yet. If you find your +favorite port is broke, send us the details or, better, send bug fixes. It's +possible that support for some older ports may be dropped in the future. + + + +Copyright (c) 1990-2008 Info-ZIP. All rights reserved. + +See the accompanying file LICENSE (the contents of which are also included +in unzip.h, zip.h and wiz.h) for terms of use. If, for some reason, all +of these files are missing, the Info-ZIP license also may be found at: +ftp://ftp.info-zip.org/pub/infozip/license.html and +http://www.info-zip.org/pub/infozip/license.html. + + +Zip 3.0 is a compression and file packaging utility. It is compatible with +PKZIP 2.04g (Phil Katz ZIP) for MSDOS systems. There is a companion to zip +called unzip (of course) which you should be able to find in the same place +you got zip. See the file 'WHERE' for details on ftp sites and mail +servers. + +So far zip has been ported to a wide array of Unix and other mainframes, +minis, and micros including VMS, OS/2, Minix, MSDOS, Windows, Atari, Amiga, +BeOS and VM/CMS. Although highly compatible with PKware's PKZIP and PKUNZIP +utilities of MSDOS fame, our primary objective has been one of portability +and other-than-MSDOS functionality. Features not found in the PKWare version +include creation of zip files in a pipe or on a device; VMS, BeOS and OS/2 +extended file attributes; conversion from Unix to MSDOS text file format; and, +of course, the ability to run on most of your favorite operating systems. And +it's free. + +See the file zip30.ann for a summary of new features in Zip 3.0 and WhatsNew +for the detailed list of new features and changes since Zip 2.32. The file +CHANGES details all day-to-day changes during development. + +Notes: + +Multi-volume support. This version does not support multi-volume spanned +archives as in pkzip 2.04g, and there is no intention at this point to support +spanned archives, but Zip 3.0 supports split archives. A split archive is an +archive split into a set of files, each file a piece of the archive and each +file using an extension, such as .z02 as in the file name archive.z02, that +provides the order of the splits. In contrast, a spanned archive is the +original multi-floppy archive supported by pkzip 2.0g where the split order +is contained in the volume labels. The contents of split and spanned archives +are mostly identical and there is a simple procedure to convert between the +formats. Many current unzips now support split archives. + +Zip64 support. This version supports Zip64 archives as described in the +PKWare AppNote. These archives use additional fields to support archives +greater than 2 GB and files in archives over the 2 GB previous limit (4 GB +on some ports). The Zip64 format also allows more than 64k entries in an +archive. Support by the OS for files larger than 4 GB is needed for Zip to +create and read large files and archives. On Unix, Win32, and some other +ports, large file and Zip64 support is automatically checked for and +compiled in if available. Use of Zip64 by Zip is automatic and to maximize +backward compatibility the Zip64 fields will only be used if needed. A +Zip64 archive requires a pkzip 4.5 compatible unzip, such as UnZip 6.0. + +Unicode support. This version has initial Unicode support. This allows +paths and names of files in other character sets to be accurately recreated +on OS that have sufficient character set support. On Win32, if wide +character calls are supported (not Win 9x unless Unicode support has been +added) all files (including paths with illegal characters in the current +character set) should now be readable by zip. Unicode support is provided +using a new set of UTF-8 path and comment extra fields and a new UTF-8 bit +for flagging when the current character set is already UTF-8. Zip 3.0 +maintains backward compatibility with older archives and is mostly compliant +with the new Unicode additions in the latest PKWare AppNote. The exception +is UTF-8 comments, which are not supported if UTF-8 is not the native +character set, but should be fully implemented in Zip 3.1. + +16-bit OS support. Though Zip 3.0 is designed to support the latest zip +standards and modern OS, some effort has been made to maintain support +for older and smaller systems. If you find Zip 3.0 does not fit on or +otherwise does not work well on a particular OS, send in the details and +we might be able to help. + +Compression methods. In addition to the standard store and deflate methods, +Zip now can use the bzip2 compression format using the bzip2 library. Though +bzip2 compression generally takes longer, in many cases using bzip2 results +in much better compression. However, many unzips may not yet support +bzip2 compressed entries in archives, so test your unzip first before using +bzip2 compression. + +Installation. Please read the file INSTALL for information on how to compile +and install zip, zipsplit, zipcloak, and zipnote and please read the manual +pages ZIP.txt, ZIPSPLIT.txt, ZIPCLOAK.txt, and ZIPNOTE.txt for information on +how to use them. Also, if you are using MSDOS or Windows, note that text +files in the distribution are generally in Unix line end format (LF only) +and Windows and DOS users will need to either convert the files as needed to +DOS line ends (CR LF) or extract the distribution contents using unzip -a. + +Utilities. At this point zipsplit, zipcloak, and zipnote should work with +large files, but they currently do not handle split archives. A work around +is to use zip to convert a split archive to a single file archive and then use +the utilities on that archive. + +Encryption. This version supports standard zip encryption. Until recently +the encryption code was distributed separately because of the US export +regulations but now is part of the main distribution. See crypt.c for +details. Decryption can be made with unzip 5.0p1 or later, or with zipcloak. + +Bug reports. All bug reports or patches should go to zip-bugs via the web +site contact form at http://www.info-zip.org/zip-bug.html (we have discontinued +the old email address zip-bugs@lists.wku.edu because of too much spam lately) +and suggestions for new features can be submitted there also (although we don't +promise to use all of them). We also are on SourceForge at +http://sourceforge.net/projects/infozip/ and now automatically get Bug Reports +and Feature Requests submitted there. In addition, a new Info-ZIP discussion +forum is available as well. See below. Though bug reports can be posted there, +we don't have automatic monitoring of all postings set up yet so you may want +to use the web form or SoureForge for a quicker response. A good approach may +be to post the details on the forum so others can benefit from the posting, +then use the web reply form to let us know you did that if you don't get a +reply in a reasonable time. + +Ports. If you're considering a port, please check in with zip-bugs FIRST, +since the code is constantly being updated behind the scenes. We'll +arrange to give you access to the latest source. + +Discussion group. If you'd like to keep up to date with our Zip (and companion +UnZip utility) development, join the ranks of BETA testers, add your own +thoughts and contributions, etc., check out the new discussion forum. This is +the latest offering, after the various Info-ZIP mailing-lists on +mxserver@lists.wku.edu (courtesy of Hunter Goatley) were no longer available +and the temporary QuickTopic discussion group for Info-ZIP issues at +http://www.quicktopic.com/27/H/V6ZQZ54uKNL died a horrible death due to large +amounts of spam. The new discussion forum is now available at +http://www.info-zip.org/board/board.pl (thanks again to Hunter Goatley) and +can be used to discuss issues, request features, and is one place new betas +and releases are announced. It also is a place to post bug reports, and +patches can be submitted as attachments. However, we don't yet get +automatic notification of all postings there so try one of the other methods +if you don't get a response. You can also post Bug Reports and Feature +Requests at Source Forge. However, the web site contact form remains +available if you would rather not post on the public forums. + +Frequently asked questions on zip and unzip: + +Q. When unzipping I get an error message about "compression method 8". + +A. This is standard deflate, which has been around for awhile. Please + get a current version of unzip. See the file 'WHERE' for details. + + +Q. How about "compression method 12"? + +A. Compression method 12 is bzip2 and requires a relatively modern unzip. + Please get the latest version of unzip. + + +Q. I can't extract this zip file that I just downloaded. I get + "zipfile is part of multi-disk archive" or some other message. + +A. Please make sure that you made the transfer in binary mode. Check + in particular that your copy has exactly the same size as the original. + Note that the above message also may actually mean you have only part + of a multi-part archive. Also note that UnZip 5.x does not and UnZip 6.0 + probably won't have multi-disk (split) archive support. A work around + is to use Zip 3.0 to convert the split archive to a single-file archive + then use UnZip on that archive. As a last result, if there's something + readable in what you have, zip -FF should be able to recover it. + + +Q. When running unzip, I get a message about "End-of-central-directory + signature not found". + +A. This usually means that your zip archive is damaged, or that you + have an uncompressed file with the same name in the same directory. + In the first case, it makes more sense to contact the person you + obtained the zip file from rather than the Info-ZIP software + developers, and to make sure that your copy is strictly identical to + the original. In the second case, use "unzip zipfile.zip" instead + of "unzip zipfile", to let unzip know which file is the zip archive + you want to extract. + + +Q. Why doesn't zip do <something> just like PKZIP does? + +A. Zip is not a PKZIP clone and is not intended to be one. In some + cases we feel PKZIP does not do the right thing (e.g., not + including pathnames by default); in some cases the operating system + itself is responsible (e.g., under Unix it is the shell which + expands wildcards, not zip). Info-ZIP's and PKWARE's zipfiles + are interchangeable, not the programs. + + For example, if you are used to the following PKZIP command: + pkzip -rP foo *.c + you must use instead on Unix: + zip -R foo "*.c" + (the quotes are needed to let the shell know that it should + not expand the *.c argument but instead pass it on to the program, + but are not needed on ports that do not expand file paths like + MSDOS) + + +Q. Can I distribute zip and unzip sources and/or executables? + +A. You may redistribute the latest official distributions without any + modification, without even asking us for permission. You can charge + for the cost of the media (CDROM, diskettes, etc...) and a small copying + fee. If you want to distribute modified versions please contact us at + www.Info-ZIP.org first. You must not distribute beta versions. + The latest official distributions are always on ftp.Info-ZIP.org in + directory /pub/infozip and subdirectories and at SourceForge. + + +Q. Can I use the executables of zip and unzip to distribute my software? + +A. Yes, so long as it is made clear in the product documentation that + zip or unzip are not being sold, that the source code is freely + available, and that there are no extra or hidden charges resulting + from its use by or inclusion with the commercial product. See the + Info-ZIP license for more. Here is an example of a suitable notice: + + NOTE: <Product> is packaged on this CD using Info-ZIP's compression + utility. The installation program uses UnZip to read zip files from + the CD. Info-ZIP's software (Zip, UnZip and related utilities) is + freely distributed under the Info-ZIP license and can be obtained as + source code or executables from various anonymous-ftp sites, + including ftp://ftp.info-zip.org/pub/infozip. + + +Q. Can I use the source code of zip and unzip in my commercial application? + +A. Yes, as long as the conditions in the Info-ZIP license are met. We + recommend you include in your product documentation an acknowledgment + and note that the original compression sources are available at + www.Info-ZIP.org. If you have special requirements contact us. |