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1.1 root 1: Copyright (C) 1990-1992 Mark Adler, Richard B. Wales, Jean-loup Gailly,
2: Kai Uwe Rommel and Igor Mandrichenko.
3: Permission is granted to any individual or institution to use, copy, or
4: redistribute this software so long as all of the original files are included
5: unmodified, that it is not sold for profit, and that this copyright notice
6: is retained.
7:
8:
9: Zip 1.9 is a compression and file packaging utility. It is analogous to a
10: combination of tar and compress and is compatible with PKZIP 1.93a
11: (Phil Katz ZIP) for MSDOS systems. There is a companion to zip called
12: unzip (of course) which you should be able to find the same place you
13: got zip. (See the file 'where' for details on ftp sites and mail
14: servers.)
15:
16: This version of zip has been ported to a wide array of Unix and other
17: mainframes, minis, and micros including VMS, OS/2, Minix, MSDOS,
18: Windows NT, Atari, and Macintosh (the latter two have not been tested
19: recently). Although highly compatible with PKware's PKZIP and PKUNZIP
20: utilities of MSDOS fame, our primary objective has been one of
21: portability and other-than-MSDOS functionality. Features not found in
22: the PKWare version include creation of zip files in a pipe or on a
23: device, VMS and OS/2 extended file attributes, conversion from Unix to
24: MSDOS text file format; and, of course, the ability to run on most of
25: your favorite operating systems. And it's free.
26:
27: If you got this file from zip19.zip, you can extract the rest only
28: with unzip 5.0 or pkzip 1.93a. See the file 'Where' if you do not
29: have them already.
30:
31: Please read the file install.doc for information on how to compile and
32: install zip, zipsplit and zipnote. Please read the file zip.doc for
33: information on how to use them. The file "contents" is a complete
34: list of the files you should have in this distribution. Also, if you
35: are using MSDOS, you should read the note on file formats at the end
36: of the contents file.
37:
38: This version supports encryption, but the encryption code is distributed
39: separately because of the US export regulations. See the file 'Where'
40: for access to the encryption code. Decryption can be made with unzip 5.0
41: or later, or with zipcloak (which is provided in the encryption supplement).
42:
43: All bug reports and patches should go to [email protected], and
44: suggestions for new features can be sent to [email protected]
45: (although we don't promise to use all suggestions). Patches should be
46: sent as context diffs only (diff -c).
47:
48: If you're considering a port, please check in with zip-bugs FIRST,
49: since the code is constantly being updated behind the scenes. We'll
50: arrange to give you access to the latest source. The alternative is the
51: possibility that your hard work will be tucked away in a sub-archive
52: and pretty much ignored. A port to VM/CMS would be welcome.
53:
54: If you'd like to keep up to date with our zip (and companion unzip utility)
55: development, join the ranks of BETA testers, add your own thoughts and
56: contributions, etc., send your request to [email protected] and
57: you will be added to the Info-ZIP newsletter mailing list.
58:
59:
60: IMPORTANT NOTES:
61:
62: - pkzip 1.93a is only an alpha version (see historical notes below). If
63: you wish to create zip files compatible with the official version of
64: pkzip (1.10), you must use zip 1.0. zip 1.9 cannot create files
65: with the old compression method (implosion).
66:
67: - zip 1.9 is is compatible with pkzip 1.93a, except when two features
68: are used: encryption or zip file created in a pipe or on a non
69: seekable device. pkzip versions of 2.0 will support such files, and
70: unzip 5.0 already supports them. (Thanks to Phil Katz for accepting
71: our suggested minor changes to the zip file format.)
72:
73: - the ports to the Macintosh and the Atari ST have been provided in
74: the hope that they can be useful, but they have been adapted from an
75: older version of zip (1.0) and are still completely untested. A
76: makefile is still missing for the Mac. Another Macintosh port is
77: being made by Johnny Lee <[email protected]> but it requires
78: more substantial changes so it will be distributed separately.
79:
80: - Please read the file zip.doc, and in particular its list of known bugs
81: at the end.
82:
83: Historical notes:
84:
85: At the time of release of zip 1.9, the official released version of
86: PKZIP is version 1.10. PKZIP 1.93a is only an alpha version, which was
87: released in October 1991. It was supposed to be replaced soon after
88: with an official release of pkzip 2.0. However, Phil Katz has not yet
89: announced a release date at the time of writing (Aug 19th, 1992).
90:
91: Beta versions of zip compatible with pkzip 1.93a have been available
92: since February 1992 to the info-zip group (see the file 'history').
93: The zip authors would have preferred to release zip 2.0 only after
94: pkzip 2.0(*), to ensure full compatibility in case of archive format
95: changes between pkzip 1.93a and 2.0. However we feel that we cannot
96: delay any further the release of zip 1.9, since all the major features
97: that we wanted to put in are now available and well tested by the
98: info-zip group.
99:
100: (*) The version number for the new pkzip was planned to be 2.00, but may
101: be increased to a number greater than 2.2 to prevent confusion with
102: several bogus versions, which may destroy all the data on your hard
103: disk if you run them.
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