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1 This is the README file for the 20 April 2009 public release of the
2 Info-ZIP group's portable UnZip zipfile-extraction program (and related
5 unzip60.zip portable UnZip, version 6.0, source code distribution
6 unzip60.tar.Z same as above, but compress'd tar format
7 unzip60.tar.gz same as above, but gzip'd tar format
11 BEFORE YOU ASK: UnZip, its companion utility Zip, and related utilities
12 and support files can be found in many places; read the file "WHERE" for
13 further details. To contact the authors with suggestions, bug reports,
14 or fixes, continue reading this file (README) and, if this is part of a
15 source distribution, the file "ZipPorts" in the proginfo directory. Also
16 in source distributions: read "BUGS" for a list of known bugs, non-bugs
17 and possible future bugs; INSTALL for instructions on how to build UnZip;
18 and "Contents" for a commented listing of all the distributed files.
22 GENERAL INFO
24 UnZip is an extraction utility for archives compressed in .zip format (also
25 called "zipfiles"). Although highly compatible both with PKWARE's PKZIP
26 and PKUNZIP utilities for MS-DOS and with Info-ZIP's own Zip program, our
27 primary objectives have been portability and non-MSDOS functionality.
29 This version of UnZip has been ported to a stupendous array of hardware--
30 from micros to supercomputers--and operating systems: Unix (many flavors),
31 VMS, OS/2 (including DLL version), Windows NT and Windows 95 (including DLL
32 version), Windows CE (GUI version), Windows 3.x (including DLL version),
33 MS-DOS, AmigaDOS, Atari TOS, Acorn RISC OS, BeOS, Macintosh (GUI version),
34 SMS/QDOS, MVS, VM/CMS, FlexOS, Tandem NSK, Human68k (mostly), AOS/VS (partly)
35 and TOPS-20 (partly). UnZip features not found in PKUNZIP include source
36 code; default extraction of directory trees (with a switch to defeat this,
37 rather than the reverse); system-specific extended file attributes; and, of
38 course, the ability to run under most of your favorite operating systems.
39 Plus, it's free. :-)
41 For source distributions, see the main Contents file for a list of what's
42 included, and read INSTALL for instructions on compiling (including OS-
43 specific comments). The individual operating systems' Contents files (for
44 example, vms/Contents) may list important compilation info in addition to
45 explaining what files are what, so be sure to read them. Some of the ports
46 have their own, special README files, so be sure to look for those, too.
48 See unzip.1 or unzip.txt for usage (or the corresponding UnZipSFX, ZipInfo,
49 fUnZip and ZipGrep docs). For VMS, unzip_def.rnh or unzip_cli.help may be
50 compiled into unzip.hlp and installed as a normal VMS help entry; see
54 CHANGES AND NEW FEATURES
56 UnZip 6.0 finally supports nowadays "large" files of sizes > 2 GiB!
57 This is the first release containing support for the PKWARE Zip64
59 Major changes are:
60 - Support PKWARE ZIP64 extensions, allowing Zip archives and Zip archive
61 entries larger than 4 GiBytes and more than 65536 entries within a single
62 Zip archive. This support is currently only available for Unix,
63 OpenVMS and Win32/Win64.
64 - Support for bzip2 compression method.
65 - Support for UTF-8 encoded entry names, both through PKWARE's "General
66 Purpose Flags Bit 11" indicator and Info-ZIP's new "up" unicode path
67 extra field. (Currently, on Windows the UTF-8 handling is limited to
68 the character subset contained in the configured non-unicode "system
69 code page".)
70 - Added "wrong implementation used" warning to error messages of the MSDOS
71 port when used under Win32, in an attempt to reduce false bug reports.
72 - Fixed "Time of Creation/Time of Use" vulnerability when setting attributes
73 of extracted files, for Unix and Unix-like ports.
74 - Fixed memory leak when processing invalid deflated data.
75 - Fixed long-standing bug in unshrink (partial_clear), added boundary checks
76 against invalid compressed data.
77 - On Unix, keep inherited SGID attribute bit for extracted directories
78 unless restoration of owner/group id or SUID/SGID/Tacky attributes was
80 - On Unix, allow extracted filenames to contain embedded control characters
81 when explicitly requested by specifying the new command line option "-^".
82 - On Unix, support restoration of symbolic link attributes.
83 - On Unix, support restoration of 32-bit UID/GID data using the new "ux"
84 IZUNIX3 extra field introduced with Zip 3.0.
85 - Support for ODS5 extended filename syntax on new OpenVMS systems.
86 - Support symbolic links zipped up on VMS.
87 - On VMS (only 8.x or better), support symbolic link creation.
88 - On VMS, support option to create converted text files in Stream_LF format.
89 - New -D option to suppress restoration of timestamps for extracted
90 directory entries (on those ports that support setting of directory
91 timestamps). By specifying "-DD", this new option also allows to suppress
92 timestamp restoration for ALL extracted files on all UnZip ports which
93 support restoration of timestamps.
94 On VMS, the default behaviour is now to skip restoration of directory
95 timestamps; here, "--D" restores ALL timestamps, "-D" restores none.
96 - On OS/2, Win32, and Unix, the (previously optional) feature UNIXBACKUP
97 to allow saving backup copies of overwritten files on extraction is now
98 enabled by default.
100 For the UnZip 6.0 release, we want to give special credit to Myles Bennet,
101 who started the job of supporting ZIP64 extensions and Large-File (> 2GiB)
102 and provided a first (alpha-state) port.
104 The 5.52 maintenance release fixes a few minor problems found in the 5.51
105 release, closes some more security holes, adds a new AtheOS port, and
106 contains a Win32 extra-field code cleanup that was not finished earlier.
107 The most important changes are:
109 - (re)enabled unshrinking support by default, the LZW patents have expired
110 - fixed an extraction size bug for encrypted stored entries (12 excess bytes
111 were written with 5.51)
112 - fixed false "uncompressed size mismatch" messages when extracting
113 encrypted archive entries
114 - do not restore SUID/SGID/Tacky attribute bits on Unix (BeOS, AtheOS)
115 unless explicitely requested by new "-K" command line qualifier
116 - optional support for "-W" qualifier to modify the pattern matching syntax
117 (with -W: "*" stops at directory delimiter, "**" matches unlimited)
118 - prevent buffer overflow caused by bogus extra-long Zipfile specification
119 - performance enhancements for VMS port
120 - fixed windll interface handling of its extraction mode qualifiers
121 nfflag, ExtractOnlyNewer, noflag, PromptToOverwrite; added detailed
122 explanation of their meanings and interactions to the windll documentation
124 The 5.51 maintenance release adds a command-line CE port, intended for
125 batch processing. With the integration of this port, the pUnZip port
126 has been revised and "revitalized".
127 The most important changes for the general public are a number of
128 bug fixes, mostly related to security issues:
130 - repair a serious bug in the textmode output conversion code for the 16-bit
131 ports (16-bit MSDOS, OS/2 1.x, some variants of AMIGA, possibly others)
132 which was introduced by the Deflate64 support of release 5.5
133 - fix a long standing bug in the the inflate decompression method that
134 prevented correct extraction in some rare cases
135 - fixed holes in parent dir traversal security code (e.g.: ".^C." slipped
136 through the previous version of the check code)
137 - fixed security hole: check naming consistency in local and central header
138 - fixed security hole: prevent extracted symlinks from redirecting file
139 extraction paths
141 The main addition in the 5.5 release is support for PKWARE's new Deflate64(tm)
142 algorithm, which appeared first in PKZIP 4.0 (published November 2000).
143 As usual, some other bugfixes and clean-ups have been integrated:
145 - support for Deflate64 (Zip compression method #9)
146 - support for extracting VMS variable length record text files on
147 any system
148 - optional "cheap autorun" feature for the SFX stub
149 - security fixes:
150 * strip leading slash from stored pathspecs,
151 * remove "../" parent dir path components from extracted file names
152 - new option "-:" to allow verbatim extraction of file names containing
153 "../" parent dir path specs
154 - fixed file handle leak for the DLL code
155 - repaired OS2 & WinNT ACL extraction which was broken in 5.42
157 The 5.42 maintenance release fixes more bugs and cleans up the redistribution
160 - removal of unreduce.c and amiga/timelib.c code to get rid of the last
161 distribution restrictions beyond the BSD-like Info-ZIP LICENSE
162 - new generic timelib replacement (currently used by AMIGA port)
163 - more reasonable mapping rules of UNIX "leading-dot" filenames to the
164 DOS 8.3 name convention
165 - repaired screensize detection in MORE paging code
166 (was broken for DOS/OS2/WIN32 in 5.41)
168 The 5.41 maintenance release adds another new port and fixes some bugs.
170 - new BSD-like LICENSE
171 - new Novell Netware NLM port
172 - supports extraction of archives with more than 64k entries
173 - attribute handling of VMS port was broken in UnZip 5.4
174 - decryption support integrated in the main source distribution
176 The 5.4 release adds new ports, again. Other important items are changes
177 to the listing format, new supplemental features and several bug fixes
178 (especially concerning time-stamp handling...):
180 - new IBM OS/390 port, a UNIX derivate (POSIX with EBCDIC charset)
181 - complete revision of the MacOS port
182 - changed listing formats to enlarge the file size fields for more digits
183 - added capability to restore directory attributes on MSDOS, OS/2, WIN32
184 - enabled support of symbolic links on BeOS
185 - Unix: optional Acorn filetype support, useful for volumes exported via NFS
186 - several changes/additions to the DLL API
187 - GUI SFX stub for Win16 (Windows 3.1) and Win32 (Windows 9x, Windows NT)
188 - new free GCC compiler environments supported on WIN32
189 - many time-zone handling bug fixes for WIN32, AMIGA, ...
191 The 5.32 release adds two new ports and a fix for at least one relatively
192 serious bug:
194 - new FlexOS port
195 - new Tandem NSK port
196 - new Visual BASIC support (compatibility with the Windows DLLs)
197 - new -T option (set zipfile timestamp) for virtually all ports
198 - fix for timestamps beyond 2038 (e.g., 2097; crashed under DOS/Win95/NT)
199 - fix for undetected "dangling" symbolic links (i.e., no pointee)
200 - fix for VMS indexed-file extraction problem (stored with Zip 2.0 or 2.1)
201 - further performance optimizations
203 The 5.31 release included nothing but small bug-fixes and typo corrections,
204 with the exception of some minor performance tweaks.
206 The 5.3 release added still more ports and more cross-platform portability
209 - new BeOS port
210 - new SMS/QDOS port
211 - new Windows CE graphical port
212 - VM/CMS port fully updated and tested
213 - MVS port fully updated and tested
214 - updated Windows DLL port, with WiZ GUI spun off to a separate package
215 - full Universal Time (UTC or GMT) support for trans-timezone consistency
216 - cross-platform support for 8-bit characters (ISO Latin-1, OEM code pages)
217 - support for NT security descriptors (ACLs)
218 - support for overwriting OS/2 directory EAs if -o option given
219 - updated Solaris/SVR4 package facility
221 What is (still!) not added is multi-part archive support (a.k.a. "diskette
222 spanning", though we really mean archive splitting and not the old diskette
223 spanning) and a unified and more powerful DLL interface. These are the two
224 highest priorities for the 6.x releases. Work on the former is almost
225 certain to have commenced by the time you read this. This time we mean it!
226 You betcha. :-)
228 Although the DLLs are still basically a mess, the Windows DLLs (16- and 32-
229 bit) now have some documentation and a small example application. Note that
230 they should now be compatible with C/C++, Visual BASIC and Delphi. Weirder
231 languages (FoxBase, etc.) are probably Right Out.
234 INTERNET RESOURCES
237 Info-ZIP's web site is at http://www.info-zip.org/pub/infozip/
238 and contains the most up-to-date information about coming releases,
239 links to binaries, and common problems.
240 (See http://www.info-zip.org/pub/infozip/FAQ.html for the latter.)
241 Files may also be retrieved via ftp://ftp.info-zip.org/pub/infozip/ .
242 Thanks to LEO (Munich, Germany) for previously hosting our primary site.
247 If you have a question regarding redistribution of Info-ZIP software, either
248 as is, as packaging for a commercial product, or as an integral part of a
249 commercial product, please read the Frequently Asked Questions (FAQ) section
250 of the included COPYING file. All Info-ZIP releases are now covered by
251 the Info-ZIP license. See the file LICENSE. The most current license
252 should be available at http://www.info-zip.org/license.html and
255 Insofar as C compilers are rare on some platforms and the authors only have
256 direct access to a subset of the supported systems, others may wish to pro-
257 vide ready-to-run executables for new systems. In general there is no prob-
258 lem with this; we require only that such distributions include this README
259 file, the WHERE file, the LICENSE file (contains copyright/redistribution
260 information), and the appropriate documentation files (unzip.txt and/or
261 unzip.1 for UnZip, etc.). If the local system provides a way to make self-
262 extracting archives in which both the executables and text files can be
263 stored together, that's best (in particular, use UnZipSFX if at all possible,
264 even if it's a few kilobytes bigger than the alternatives); otherwise we
265 suggest a bare UnZip executable and a separate zipfile containing the re-
266 maining text and binary files. If another archiving method is in common
267 use on the target system (for example, Zoo or LHa), that may also be used.
270 BUGS AND NEW PORTS: CONTACTING INFO-ZIP
272 All bug reports and patches (context diffs only, please!) should be
273 submitted either through the new Info-ZIP Discussion Forum at
274 http://www.info-zip.org/board/board.pl or through the Info-ZIP SourceForge
275 site at http://sourceforge.net/projects/infozip/. The forum allows file
276 attachments while SourceForge provides a place to post patches. The old
277 Zip-Bugs@lists.wku.edu e-mail address for the Info-ZIP authors was
278 discontinued after heavy continuous spam, as was the QuickTopic discussion
279 forum. The above methods are public, but we also can be reached directly
280 using the web reply page at http://www.info-zip.org/zip-bug.html. If you
281 need to send us files privately, contact us first for instructions.
283 "Dumb questions" that aren't adequately answered in the documentation
284 should also be directed to Zip-Bugs rather than to a global forum such
285 as Usenet. (Kindly make certain that your question *isn't* answered by
286 the documentation, however--a great deal of effort has gone into making
287 it clear and complete.)
289 Suggestions for new features can be discussed on the new Discussion Forum.
290 A new mailing list for Info-ZIP beta testers and interested parties may
291 be created someday, but for now any issues found in the betas should use
292 the forum. We make no promises to act on all suggestions or even all
293 patches, but if it is something that is manifestly useful, sending the
294 required patches to Zip-Bugs directly (as per the instructions in the
295 ZipPorts file) is likely to produce a quicker response than asking us to
296 do it--the authors are always ridiculously short on time. (Please do
297 NOT send patches or encoded zipfiles to the Info-ZIP list. Please DO
298 read the ZipPorts file before sending any large patch. It would be
299 difficult to over-emphasize this point...)
301 If you are considering a port, not only should you read the ZipPorts file,
302 but also please check in with Zip-Bugs BEFORE getting started, since the
303 code is constantly being updated behind the scenes. (For example, VxWorks,
304 VMOS and Netware ports were once claimed to be under construction, although
305 we have yet to see any up-to-date patches.) We will arrange to send you the
306 latest sources. The alternative is the possibility that your hard work will
307 be tucked away in a subdirectory and mostly ignored, or completely ignored
308 if someone else has already done the port (and you'd be surprised how often
309 this has happened).
312 BETA TESTING: JOINING INFO-ZIP
314 If you'd like to keep up to date with our UnZip (and companion Zip utility)
315 development, join the ranks of beta testers, add your own thoughts and
316 contributions, or simply lurk, you may join one of our mailing lists.
317 There is an announcements-only list (Info-ZIP-announce) and a general
318 discussion/testing list (Info-ZIP). You must be a subscriber to post, and
319 you can subscribe via the links on our Frequently Asked Questions page:
323 (Please note that as of late May 2004, the lists are unavailable pending
324 a move to a new site; we hope to have them restored shortly. In the
325 interim ...) Feel free to use our bug-reporting web page for bug reports
326 and to ask questions not answered on the FAQ page above:
330 For now the best option is to monitor and contribute to the various threads
331 on the new discussion forum site at:
335 The second best way to contribute is through the various features at
336 SourceForge, such as the bug posting areas.
338 There is also a closed mailing list for internal discussions of our core
339 development team. This list is now kept secret to prevent us from being
340 flooded with spam messages.
343 -- Greg Roelofs (sometimes known as Cave Newt), principal UnZip developer
344 guy, with inspiration from David Kirschbaum, was Author of this text.
346 -- Christian Spieler (shorthand: SPC), current UnZip maintenance coordinator,
347 applied the most recent changes, with Ed Gordon providing a few additions.