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Routines/unzipsfx.t
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn hard disk » unzip_tools » !Infozip |
| Filename: | Routines/unzipsfx.t |
| Read OK: | ✔ |
| File size: | 3763 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
UNZIPSFX(1L) UNZIPSFX(1L)
NAME
unzipsfx - self-extracting stub for prepending to ZIP archives
SYNOPSIS
<name of unzipsfx+archive combo> [-cfptuz[ajnoqsCLV$]] [file(s) ...
[-x xfile(s) ...]]
DESCRIPTION
unzipsfx is a modified version of unzip(1L) designed to be prepended to
existing ZIP archives in order to form self-extracting archives.
Instead of taking its first non-flag argument to be the zipfile(s) to
be extracted, unzipsfx seeks itself under the name by which it was
invoked and tests or extracts the contents of the appended archive.
Because the executable stub adds bulk to the archive (the whole purpose
of which is to be as small as possible), a number of the less-vital
capabilities in regular unzip have been removed. Among these are the
usage (or help) screen, the listing and diagnostic functions (-l and
-v), the ability to decompress older compression formats (the
``reduce,'' ``shrink'' and ``implode'' methods). The ability to
extract to a directory other than the current one can be selected as a
compile-time option, which is now enabled by default since UnZipSFX
version 5.5. Similarly, decryption is supported as a compile-time
option but should be avoided unless the attached archive contains
encrypted files. Starting with release 5.5, another compile-time option
adds a simple ``run command after extraction'' feature. This feature
is currently incompatible with the ``extract to different directory''
feature and remains disabled by default.
Note that self-extracting archives made with unzipsfx are no more (or
less) portable across different operating systems than is the unzip
executable itself. In general a self-extracting archive made on a par-
ticular Unix system, for example, will only self-extract under the same
flavor of Unix. Regular unzip may still be used to extract the embed-
ded archive as with any normal zipfile, although it will generate a
harmless warning about extra bytes at the beginning of the zipfile.
Despite this, however, the self-extracting archive is technically not a
valid ZIP archive, and PKUNZIP may be unable to test or extract it.
This limitation is due to the simplistic manner in which the archive is
created; the internal directory structure is not updated to reflect the
extra bytes prepended to the original zipfile.
ARGUMENTS
[file(s)]
An optional list of archive members to be processed. Regular
expressions (wildcards) similar to those in Unix egrep(1) may be
used to match multiple members. These wildcards may contain:
* matches a sequence of 0 or more characters
? matches exactly 1 character
[...] matches any single character found inside the brackets;
ranges are specified by a beginning character, a hyphen,
and an ending character. If an exclamation point or a
caret (`!' or `^') follows the left bracket, then the
range of characters within the brackets is complemented
(that is, anything except the characters inside the
brackets is considered a match).
(Be sure to quote any character that might otherwise be inter-
preted or modified by the operating system, particularly under
Unix and VMS.)
[-x xfile(s)]
An optional list of archive members to be excluded from process-
ing. Since wildcard characters match directory separators
(`/'), this option may be used to exclude any files that are in
subdirectories. For example, ``foosfx *.[ch] -x */*'' would
extract all C source files in the main directory, but none in
any subdirectories. Without the -x option, all C source files
in all directories within the zipfile would be extracted.
If unzipsfx is compiled with SFX_EXDIR defined, the following option is
also enabled:
[-d exdir]
An optional directory to which to extract files. By default,
all files and subdirectories are recreated in the current direc-
tory; the -d option allows extraction in an arbitrary directory
(always assuming one has permission to write to the directory).
The option and directory may be concatenated without any white
space between them, but note that this may cause normal shell
behavior to be suppressed. In particular, ``-d ~'' (tilde) is
expanded by Unix C shells into the name of the user's home
directory, but ``-d~'' is treated as a literal subdirectory
``~'' of the current directory.
OPTIONS
unzipsfx supports the following unzip(1L) options: -c and -p (extract
to standard output/screen), -f and -u (freshen and update existing
files upon extraction), -t (test archive) and -z (print archive com-
ment). All normal listing options (-l, -v and -Z) have been removed,
but the testing option (-t) may be used as a ``poor man's'' listing.
Alternatively, those creating self-extracting archives may wish to
include a short listing in the zipfile comment.
See unzip(1L) for a more complete description of these options.
MODIFIERS
unzipsfx currently supports all unzip(1L) modifiers: -a (convert text
files), -n (never overwrite), -o (overwrite without prompting), -q
(operate quietly), -C (match names case-insensitively), -L (convert
uppercase-OS names to lowercase), -j (junk paths) and -V (retain ver-
sion numbers); plus the following operating-system specific options:
-X (restore VMS owner/protection info), -s (convert spaces in filenames
to underscores [DOS, OS/2, NT]) and -$ (restore volume label [DOS,
OS/2, NT, Amiga]).
(Support for regular ASCII text-conversion may be removed in future
versions, since it is simple enough for the archive's creator to ensure
that text files have the appropriate format for the local OS. EBCDIC
conversion will of course continue to be supported since the zipfile
format implies ASCII storage of text files.)
See unzip(1L) for a more complete description of these modifiers.
ENVIRONMENT OPTIONS
unzipsfx uses the same environment variables as unzip(1L) does,
although this is likely to be an issue only for the person creating and
testing the self-extracting archive. See unzip(1L) for details.
DECRYPTION
Decryption is supported exactly as in unzip(1L); that is, interactively
with a non-echoing prompt for the password(s). See unzip(1L) for
details. Once again, note that if the archive has no encrypted files
there is no reason to use a version of unzipsfx with decryption sup-
port; that only adds to the size of the archive.
AUTORUN COMMAND
When unzipsfx was compiled with CHEAP_SFX_AUTORUN defined, a simple
``command autorun'' feature is supported. You may enter a command into
the Zip archive comment, using the following format:
$AUTORUN$>[command line string]
When unzipsfx recognizes the ``$AUTORUN$>'' token at the beginning of
the Zip archive comment, the remainder of the first line of the comment
(until the first newline character) is passed as a shell command to the
operating system using the C rtl ``system'' function. Before executing
the command, unzipsfx displays the command on the console and prompts
the user for confirmation. When the user has switched off prompting by
specifying the -q option, autorun commands are never executed.
In case the archive comment contains additional lines of text, the
remainder of the archive comment following the first line is displayed
normally, unless quiet operation was requested by supplying a -q
option.
EXAMPLES
To create a self-extracting archive letters from a regular zipfile let-
ters.zip and change the new archive's permissions to be world-exe-
cutable under Unix:
cat unzipsfx letters.zip > letters
chmod 755 letters
zip -A letters
To create the same archive under MS-DOS, OS/2 or NT (note the use of
the /b [binary] option to the copy command):
copy /b unzipsfx.exe+letters.zip letters.exe
zip -A letters.exe
Under VMS:
copy unzipsfx.exe,letters.zip letters.exe
letters == "$currentdisk:[currentdir]letters.exe"
zip -A letters.exe
(The VMS append command may also be used. The second command installs
the new program as a ``foreign command'' capable of taking arguments.
The third line assumes that Zip is already installed as a foreign com-
mand.) Under AmigaDOS:
MakeSFX letters letters.zip UnZipSFX
(MakeSFX is included with the UnZip source distribution and with Amiga
binary distributions. ``zip -A'' doesn't work on Amiga self-extracting
archives.) To test (or list) the newly created self-extracting
archive:
letters -t
To test letters quietly, printing only a summary message indicating
whether the archive is OK or not:
letters -tqq
To extract the complete contents into the current directory, recreating
all files and subdirectories as necessary:
letters
To extract all *.txt files (in Unix quote the `*'):
letters *.txt
To extract everything except the *.txt files:
letters -x *.txt
To extract only the README file to standard output (the screen):
letters -c README
To print only the zipfile comment:
letters -z
LIMITATIONS
The principle and fundamental limitation of unzipsfx is that it is not
portable across architectures or operating systems, and therefore nei-
ther are the resulting archives. For some architectures there is lim-
ited portability, however (e.g., between some flavors of Intel-based
Unix).
Another problem with the current implementation is that any archive
with ``junk'' prepended to the beginning technically is no longer a
zipfile (unless zip(1) is used to adjust the zipfile offsets appropri-
ately, as noted above). unzip(1) takes note of the prepended bytes and
ignores them since some file-transfer protocols, notably MacBinary, are
also known to prepend junk. But PKWARE's archiver suite may not be
able to deal with the modified archive unless its offsets have been
adjusted.
unzipsfx has no knowledge of the user's PATH, so in general an archive
must either be in the current directory when it is invoked, or else a
full or relative path must be given. If a user attempts to extract the
archive from a directory in the PATH other than the current one,
unzipsfx will print a warning to the effect, ``can't find myself.''
This is always true under Unix and may be true in some cases under MS-
DOS, depending on the compiler used (Microsoft C fully qualifies the
program name, but other compilers may not). Under OS/2 and NT there
are operating-system calls available that provide the full path name,
so the archive may be invoked from anywhere in the user's path. The
situation is not known for AmigaDOS, Atari TOS, MacOS, etc.
As noted above, a number of the normal unzip(1L) functions have been
removed in order to make unzipsfx smaller: usage and diagnostic info,
listing functions and extraction to other directories. Also, only
stored and deflated files are supported. The latter limitation is
mainly relevant to those who create SFX archives, however.
VMS users must know how to set up self-extracting archives as foreign
commands in order to use any of unzipsfx's options. This is not neces-
sary for simple extraction, but the command to do so then becomes,
e.g., ``run letters'' (to continue the examples given above).
unzipsfx on the Amiga requires the use of a special program, MakeSFX,
in order to create working self-extracting archives; simple concatena-
tion does not work. (For technically oriented users, the attached
archive is defined as a ``debug hunk.'') There may be compatibility
problems between the ROM levels of older Amigas and newer ones.
All current bugs in unzip(1L) exist in unzipsfx as well.
DIAGNOSTICS
unzipsfx's exit status (error level) is identical to that of unzip(1L);
see the corresponding man page.
SEE ALSO
funzip(1L), unzip(1L), zip(1L), zipcloak(1L), zipgrep(1L), zipinfo(1L),
zipnote(1L), zipsplit(1L)
URL
The Info-ZIP home page is currently at
http://www.info-zip.org/pub/infozip/
or
ftp://ftp.info-zip.org/pub/infozip/ .
AUTHORS
Greg Roelofs was responsible for the basic modifications to UnZip nec-
essary to create UnZipSFX. See unzip(1L) for the current list of Zip-
Bugs authors, or the file CONTRIBS in the UnZip source distribution for
the full list of Info-ZIP contributors.
Info-ZIP 20 April 2009 (v6.0) UNZIPSFX(1L)
00000000 55 4e 5a 49 50 53 46 58 28 31 4c 29 20 20 20 20 |UNZIPSFX(1L) | 00000010 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000040 20 20 55 4e 5a 49 50 53 46 58 28 31 4c 29 0a 0a | UNZIPSFX(1L)..| 00000050 4e 41 4d 45 0a 20 20 20 20 20 20 20 75 6e 7a 69 |NAME. unzi| 00000060 70 73 66 78 20 2d 20 73 65 6c 66 2d 65 78 74 72 |psfx - self-extr| 00000070 61 63 74 69 6e 67 20 73 74 75 62 20 66 6f 72 20 |acting stub for | 00000080 70 72 65 70 65 6e 64 69 6e 67 20 74 6f 20 5a 49 |prepending to ZI| 00000090 50 20 61 72 63 68 69 76 65 73 0a 0a 53 59 4e 4f |P archives..SYNO| 000000a0 50 53 49 53 0a 20 20 20 20 20 20 20 3c 6e 61 6d |PSIS. <nam| 000000b0 65 20 20 6f 66 20 20 75 6e 7a 69 70 73 66 78 2b |e of unzipsfx+| 000000c0 61 72 63 68 69 76 65 20 20 63 6f 6d 62 6f 3e 20 |archive combo> | 000000d0 20 5b 2d 63 66 70 74 75 7a 5b 61 6a 6e 6f 71 73 | [-cfptuz[ajnoqs| 000000e0 43 4c 56 24 5d 5d 20 5b 66 69 6c 65 28 73 29 20 |CLV$]] [file(s) | 000000f0 2e 2e 2e 0a 20 20 20 20 20 20 20 5b 2d 78 20 78 |.... [-x x| 00000100 66 69 6c 65 28 73 29 20 2e 2e 2e 5d 5d 0a 0a 44 |file(s) ...]]..D| 00000110 45 53 43 52 49 50 54 49 4f 4e 0a 20 20 20 20 20 |ESCRIPTION. | 00000120 20 20 75 6e 7a 69 70 73 66 78 20 69 73 20 61 20 | unzipsfx is a | 00000130 6d 6f 64 69 66 69 65 64 20 76 65 72 73 69 6f 6e |modified version| 00000140 20 6f 66 20 75 6e 7a 69 70 28 31 4c 29 20 64 65 | of unzip(1L) de| 00000150 73 69 67 6e 65 64 20 74 6f 20 62 65 20 70 72 65 |signed to be pre| 00000160 70 65 6e 64 65 64 20 74 6f 0a 20 20 20 20 20 20 |pended to. | 00000170 20 65 78 69 73 74 69 6e 67 20 20 5a 49 50 20 20 | existing ZIP | 00000180 61 72 63 68 69 76 65 73 20 20 69 6e 20 20 6f 72 |archives in or| 00000190 64 65 72 20 20 74 6f 20 20 66 6f 72 6d 20 20 73 |der to form s| 000001a0 65 6c 66 2d 65 78 74 72 61 63 74 69 6e 67 20 61 |elf-extracting a| 000001b0 72 63 68 69 76 65 73 2e 0a 20 20 20 20 20 20 20 |rchives.. | 000001c0 49 6e 73 74 65 61 64 20 6f 66 20 74 61 6b 69 6e |Instead of takin| 000001d0 67 20 69 74 73 20 66 69 72 73 74 20 6e 6f 6e 2d |g its first non-| 000001e0 66 6c 61 67 20 61 72 67 75 6d 65 6e 74 20 74 6f |flag argument to| 000001f0 20 62 65 20 74 68 65 20 20 7a 69 70 66 69 6c 65 | be the zipfile| 00000200 28 73 29 20 20 74 6f 0a 20 20 20 20 20 20 20 62 |(s) to. b| 00000210 65 20 20 65 78 74 72 61 63 74 65 64 2c 20 20 75 |e extracted, u| 00000220 6e 7a 69 70 73 66 78 20 20 73 65 65 6b 73 20 20 |nzipsfx seeks | 00000230 69 74 73 65 6c 66 20 20 75 6e 64 65 72 20 74 68 |itself under th| 00000240 65 20 6e 61 6d 65 20 62 79 20 77 68 69 63 68 20 |e name by which | 00000250 69 74 20 77 61 73 0a 20 20 20 20 20 20 20 69 6e |it was. in| 00000260 76 6f 6b 65 64 20 61 6e 64 20 74 65 73 74 73 20 |voked and tests | 00000270 6f 72 20 65 78 74 72 61 63 74 73 20 74 68 65 20 |or extracts the | 00000280 63 6f 6e 74 65 6e 74 73 20 20 6f 66 20 20 74 68 |contents of th| 00000290 65 20 20 61 70 70 65 6e 64 65 64 20 20 61 72 63 |e appended arc| 000002a0 68 69 76 65 2e 0a 20 20 20 20 20 20 20 42 65 63 |hive.. 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A| 00000380 6d 6f 6e 67 20 74 68 65 73 65 20 61 72 65 20 74 |mong these are t| 00000390 68 65 0a 20 20 20 20 20 20 20 75 73 61 67 65 20 |he. usage | 000003a0 28 6f 72 20 68 65 6c 70 29 20 73 63 72 65 65 6e |(or help) screen| 000003b0 2c 20 74 68 65 20 6c 69 73 74 69 6e 67 20 61 6e |, the listing an| 000003c0 64 20 64 69 61 67 6e 6f 73 74 69 63 20 20 66 75 |d diagnostic fu| 000003d0 6e 63 74 69 6f 6e 73 20 20 28 2d 6c 20 20 61 6e |nctions (-l an| 000003e0 64 0a 20 20 20 20 20 20 20 2d 76 29 2c 20 20 20 |d. -v), | 000003f0 74 68 65 20 20 20 61 62 69 6c 69 74 79 20 20 74 |the ability t| 00000400 6f 20 20 64 65 63 6f 6d 70 72 65 73 73 20 20 6f |o decompress o| 00000410 6c 64 65 72 20 20 63 6f 6d 70 72 65 73 73 69 6f |lder compressio| 00000420 6e 20 20 66 6f 72 6d 61 74 73 20 20 28 74 68 65 |n formats (the| 00000430 0a 20 20 20 20 20 20 20 60 60 72 65 64 75 63 65 |. ``reduce| 00000440 2c 27 27 20 20 60 60 73 68 72 69 6e 6b 27 27 20 |,'' ``shrink'' | 00000450 20 61 6e 64 20 20 60 60 69 6d 70 6c 6f 64 65 27 | and ``implode'| 00000460 27 20 20 6d 65 74 68 6f 64 73 29 2e 20 20 20 54 |' methods). T| 00000470 68 65 20 20 61 62 69 6c 69 74 79 20 20 74 6f 0a |he ability to.| 00000480 20 20 20 20 20 20 20 65 78 74 72 61 63 74 20 20 | extract | 00000490 74 6f 20 61 20 64 69 72 65 63 74 6f 72 79 20 6f |to a directory o| 000004a0 74 68 65 72 20 74 68 61 6e 20 74 68 65 20 63 75 |ther than the cu| 000004b0 72 72 65 6e 74 20 6f 6e 65 20 63 61 6e 20 62 65 |rrent one can be| 000004c0 20 73 65 6c 65 63 74 65 64 20 61 73 20 61 0a 20 | selected as a. | 000004d0 20 20 20 20 20 20 63 6f 6d 70 69 6c 65 2d 74 69 | compile-ti| 000004e0 6d 65 20 6f 70 74 69 6f 6e 2c 20 77 68 69 63 68 |me option, which| 000004f0 20 69 73 20 6e 6f 77 20 65 6e 61 62 6c 65 64 20 | is now enabled | 00000500 20 62 79 20 20 64 65 66 61 75 6c 74 20 20 73 69 | by default si| 00000510 6e 63 65 20 20 55 6e 5a 69 70 53 46 58 0a 20 20 |nce UnZipSFX. | 00000520 20 20 20 20 20 76 65 72 73 69 6f 6e 20 20 35 2e | version 5.| 00000530 35 2e 20 20 20 53 69 6d 69 6c 61 72 6c 79 2c 20 |5. Similarly, | 00000540 20 64 65 63 72 79 70 74 69 6f 6e 20 20 69 73 20 | decryption is | 00000550 20 73 75 70 70 6f 72 74 65 64 20 61 73 20 61 20 | supported as a | 00000560 63 6f 6d 70 69 6c 65 2d 74 69 6d 65 0a 20 20 20 |compile-time. | 00000570 20 20 20 20 6f 70 74 69 6f 6e 20 62 75 74 20 73 | option but s| 00000580 68 6f 75 6c 64 20 62 65 20 20 61 76 6f 69 64 65 |hould be avoide| 00000590 64 20 20 75 6e 6c 65 73 73 20 20 74 68 65 20 20 |d unless the | 000005a0 61 74 74 61 63 68 65 64 20 20 61 72 63 68 69 76 |attached archiv| 000005b0 65 20 20 63 6f 6e 74 61 69 6e 73 0a 20 20 20 20 |e contains. | 000005c0 20 20 20 65 6e 63 72 79 70 74 65 64 20 66 69 6c | encrypted fil| 000005d0 65 73 2e 20 53 74 61 72 74 69 6e 67 20 77 69 74 |es. Starting wit| 000005e0 68 20 72 65 6c 65 61 73 65 20 35 2e 35 2c 20 61 |h release 5.5, a| 000005f0 6e 6f 74 68 65 72 20 63 6f 6d 70 69 6c 65 2d 74 |nother compile-t| 00000600 69 6d 65 20 6f 70 74 69 6f 6e 0a 20 20 20 20 20 |ime option. | 00000610 20 20 61 64 64 73 20 61 20 73 69 6d 70 6c 65 20 | adds a simple | 00000620 60 60 72 75 6e 20 63 6f 6d 6d 61 6e 64 20 61 66 |``run command af| 00000630 74 65 72 20 65 78 74 72 61 63 74 69 6f 6e 27 27 |ter extraction''| 00000640 20 66 65 61 74 75 72 65 2e 20 20 20 54 68 69 73 | feature. This| 00000650 20 20 66 65 61 74 75 72 65 0a 20 20 20 20 20 20 | feature. | 00000660 20 69 73 20 20 63 75 72 72 65 6e 74 6c 79 20 20 | is currently | 00000670 69 6e 63 6f 6d 70 61 74 69 62 6c 65 20 77 69 74 |incompatible wit| 00000680 68 20 74 68 65 20 60 60 65 78 74 72 61 63 74 20 |h the ``extract | 00000690 74 6f 20 64 69 66 66 65 72 65 6e 74 20 64 69 72 |to different dir| 000006a0 65 63 74 6f 72 79 27 27 0a 20 20 20 20 20 20 20 |ectory''. | 000006b0 66 65 61 74 75 72 65 20 61 6e 64 20 72 65 6d 61 |feature and rema| 000006c0 69 6e 73 20 64 69 73 61 62 6c 65 64 20 62 79 20 |ins disabled by | 000006d0 64 65 66 61 75 6c 74 2e 0a 0a 20 20 20 20 20 20 |default... | 000006e0 20 4e 6f 74 65 20 74 68 61 74 20 73 65 6c 66 2d | Note that self-| 000006f0 65 78 74 72 61 63 74 69 6e 67 20 61 72 63 68 69 |extracting archi| 00000700 76 65 73 20 6d 61 64 65 20 77 69 74 68 20 75 6e |ves made with un| 00000710 7a 69 70 73 66 78 20 61 72 65 20 6e 6f 20 20 6d |zipsfx are no m| 00000720 6f 72 65 20 20 28 6f 72 0a 20 20 20 20 20 20 20 |ore (or. | 00000730 6c 65 73 73 29 20 20 70 6f 72 74 61 62 6c 65 20 |less) portable | 00000740 20 61 63 72 6f 73 73 20 20 64 69 66 66 65 72 65 | across differe| 00000750 6e 74 20 20 6f 70 65 72 61 74 69 6e 67 20 73 79 |nt operating sy| 00000760 73 74 65 6d 73 20 74 68 61 6e 20 69 73 20 74 68 |stems than is th| 00000770 65 20 75 6e 7a 69 70 0a 20 20 20 20 20 20 20 65 |e unzip. e| 00000780 78 65 63 75 74 61 62 6c 65 20 69 74 73 65 6c 66 |xecutable itself| 00000790 2e 20 20 49 6e 20 67 65 6e 65 72 61 6c 20 61 20 |. In general a | 000007a0 73 65 6c 66 2d 65 78 74 72 61 63 74 69 6e 67 20 |self-extracting | 000007b0 61 72 63 68 69 76 65 20 6d 61 64 65 20 6f 6e 20 |archive made on | 000007c0 61 20 70 61 72 2d 0a 20 20 20 20 20 20 20 74 69 |a par-. ti| 000007d0 63 75 6c 61 72 20 55 6e 69 78 20 73 79 73 74 65 |cular Unix syste| 000007e0 6d 2c 20 66 6f 72 20 65 78 61 6d 70 6c 65 2c 20 |m, for example, | 000007f0 77 69 6c 6c 20 6f 6e 6c 79 20 73 65 6c 66 2d 65 |will only self-e| 00000800 78 74 72 61 63 74 20 75 6e 64 65 72 20 74 68 65 |xtract under the| 00000810 20 73 61 6d 65 0a 20 20 20 20 20 20 20 66 6c 61 | same. fla| 00000820 76 6f 72 20 6f 66 20 55 6e 69 78 2e 20 20 52 65 |vor of Unix. Re| 00000830 67 75 6c 61 72 20 75 6e 7a 69 70 20 6d 61 79 20 |gular unzip may | 00000840 73 74 69 6c 6c 20 62 65 20 75 73 65 64 20 74 6f |still be used to| 00000850 20 65 78 74 72 61 63 74 20 74 68 65 20 20 65 6d | extract the em| 00000860 62 65 64 2d 0a 20 20 20 20 20 20 20 64 65 64 20 |bed-. ded | 00000870 20 61 72 63 68 69 76 65 20 20 61 73 20 20 77 69 | archive as wi| 00000880 74 68 20 20 61 6e 79 20 6e 6f 72 6d 61 6c 20 7a |th any normal z| 00000890 69 70 66 69 6c 65 2c 20 61 6c 74 68 6f 75 67 68 |ipfile, although| 000008a0 20 69 74 20 77 69 6c 6c 20 67 65 6e 65 72 61 74 | it will generat| 000008b0 65 20 61 0a 20 20 20 20 20 20 20 68 61 72 6d 6c |e a. harml| 000008c0 65 73 73 20 77 61 72 6e 69 6e 67 20 61 62 6f 75 |ess warning abou| 000008d0 74 20 65 78 74 72 61 20 62 79 74 65 73 20 61 74 |t extra bytes at| 000008e0 20 74 68 65 20 20 62 65 67 69 6e 6e 69 6e 67 20 | the beginning | 000008f0 20 6f 66 20 20 74 68 65 20 20 7a 69 70 66 69 6c | of the zipfil| 00000900 65 2e 0a 20 20 20 20 20 20 20 44 65 73 70 69 74 |e.. 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A| 00002a50 6e 6f 74 68 65 72 20 70 72 6f 62 6c 65 6d 20 77 |nother problem w| 00002a60 69 74 68 20 74 68 65 20 63 75 72 72 65 6e 74 20 |ith the current | 00002a70 69 6d 70 6c 65 6d 65 6e 74 61 74 69 6f 6e 20 20 |implementation | 00002a80 69 73 20 20 74 68 61 74 20 20 61 6e 79 20 20 61 |is that any a| 00002a90 72 63 68 69 76 65 0a 20 20 20 20 20 20 20 77 69 |rchive. wi| 00002aa0 74 68 20 20 60 60 6a 75 6e 6b 27 27 20 20 70 72 |th ``junk'' pr| 00002ab0 65 70 65 6e 64 65 64 20 20 74 6f 20 20 74 68 65 |epended to the| 00002ac0 20 62 65 67 69 6e 6e 69 6e 67 20 74 65 63 68 6e | beginning techn| 00002ad0 69 63 61 6c 6c 79 20 69 73 20 6e 6f 20 6c 6f 6e |ically is no lon| 00002ae0 67 65 72 20 61 0a 20 20 20 20 20 20 20 7a 69 70 |ger a. zip| 00002af0 66 69 6c 65 20 28 75 6e 6c 65 73 73 20 7a 69 70 |file (unless zip| 00002b00 28 31 29 20 69 73 20 75 73 65 64 20 74 6f 20 61 |(1) is used to a| 00002b10 64 6a 75 73 74 20 74 68 65 20 7a 69 70 66 69 6c |djust the zipfil| 00002b20 65 20 6f 66 66 73 65 74 73 20 20 61 70 70 72 6f |e offsets appro| 00002b30 70 72 69 2d 0a 20 20 20 20 20 20 20 61 74 65 6c |pri-. atel| 00002b40 79 2c 20 61 73 20 6e 6f 74 65 64 20 61 62 6f 76 |y, as noted abov| 00002b50 65 29 2e 20 20 75 6e 7a 69 70 28 31 29 20 74 61 |e). unzip(1) ta| 00002b60 6b 65 73 20 6e 6f 74 65 20 6f 66 20 74 68 65 20 |kes note of the | 00002b70 70 72 65 70 65 6e 64 65 64 20 62 79 74 65 73 20 |prepended bytes | 00002b80 61 6e 64 0a 20 20 20 20 20 20 20 69 67 6e 6f 72 |and. ignor| 00002b90 65 73 20 74 68 65 6d 20 73 69 6e 63 65 20 73 6f |es them since so| 00002ba0 6d 65 20 66 69 6c 65 2d 74 72 61 6e 73 66 65 72 |me file-transfer| 00002bb0 20 70 72 6f 74 6f 63 6f 6c 73 2c 20 6e 6f 74 61 | protocols, nota| 00002bc0 62 6c 79 20 4d 61 63 42 69 6e 61 72 79 2c 20 61 |bly MacBinary, a| 00002bd0 72 65 0a 20 20 20 20 20 20 20 61 6c 73 6f 20 20 |re. also | 00002be0 6b 6e 6f 77 6e 20 20 74 6f 20 20 70 72 65 70 65 |known to prepe| 00002bf0 6e 64 20 20 6a 75 6e 6b 2e 20 20 42 75 74 20 50 |nd junk. But P| 00002c00 4b 57 41 52 45 27 73 20 61 72 63 68 69 76 65 72 |KWARE's archiver| 00002c10 20 73 75 69 74 65 20 6d 61 79 20 6e 6f 74 20 62 | suite may not b| 00002c20 65 0a 20 20 20 20 20 20 20 61 62 6c 65 20 74 6f |e. able to| 00002c30 20 64 65 61 6c 20 77 69 74 68 20 74 68 65 20 6d | deal with the m| 00002c40 6f 64 69 66 69 65 64 20 61 72 63 68 69 76 65 20 |odified archive | 00002c50 75 6e 6c 65 73 73 20 20 69 74 73 20 20 6f 66 66 |unless its off| 00002c60 73 65 74 73 20 20 68 61 76 65 20 20 62 65 65 6e |sets have been| 00002c70 0a 20 20 20 20 20 20 20 61 64 6a 75 73 74 65 64 |. adjusted| 00002c80 2e 0a 0a 20 20 20 20 20 20 20 75 6e 7a 69 70 73 |... unzips| 00002c90 66 78 20 20 68 61 73 20 6e 6f 20 6b 6e 6f 77 6c |fx has no knowl| 00002ca0 65 64 67 65 20 6f 66 20 74 68 65 20 75 73 65 72 |edge of the user| 00002cb0 27 73 20 50 41 54 48 2c 20 73 6f 20 69 6e 20 67 |'s PATH, so in g| 00002cc0 65 6e 65 72 61 6c 20 61 6e 20 61 72 63 68 69 76 |eneral an archiv| 00002cd0 65 0a 20 20 20 20 20 20 20 6d 75 73 74 20 65 69 |e. must ei| 00002ce0 74 68 65 72 20 62 65 20 69 6e 20 74 68 65 20 63 |ther be in the c| 00002cf0 75 72 72 65 6e 74 20 64 69 72 65 63 74 6f 72 79 |urrent directory| 00002d00 20 77 68 65 6e 20 69 74 20 69 73 20 69 6e 76 6f | when it is invo| 00002d10 6b 65 64 2c 20 6f 72 20 20 65 6c 73 65 20 20 61 |ked, or else a| 00002d20 0a 20 20 20 20 20 20 20 66 75 6c 6c 20 6f 72 20 |. full or | 00002d30 72 65 6c 61 74 69 76 65 20 70 61 74 68 20 6d 75 |relative path mu| 00002d40 73 74 20 62 65 20 67 69 76 65 6e 2e 20 20 49 66 |st be given. If| 00002d50 20 61 20 75 73 65 72 20 61 74 74 65 6d 70 74 73 | a user attempts| 00002d60 20 74 6f 20 65 78 74 72 61 63 74 20 74 68 65 0a | to extract the.| 00002d70 20 20 20 20 20 20 20 61 72 63 68 69 76 65 20 66 | archive f| 00002d80 72 6f 6d 20 61 20 64 69 72 65 63 74 6f 72 79 20 |rom a directory | 00002d90 69 6e 20 20 74 68 65 20 20 50 41 54 48 20 20 6f |in the PATH o| 00002da0 74 68 65 72 20 20 74 68 61 6e 20 20 74 68 65 20 |ther than the | 00002db0 20 63 75 72 72 65 6e 74 20 20 6f 6e 65 2c 0a 20 | current one,. | 00002dc0 20 20 20 20 20 20 75 6e 7a 69 70 73 66 78 20 20 | unzipsfx | 00002dd0 77 69 6c 6c 20 20 70 72 69 6e 74 20 20 61 20 20 |will print a | 00002de0 77 61 72 6e 69 6e 67 20 74 6f 20 74 68 65 20 65 |warning to the e| 00002df0 66 66 65 63 74 2c 20 60 60 63 61 6e 27 74 20 66 |ffect, ``can't f| 00002e00 69 6e 64 20 6d 79 73 65 6c 66 2e 27 27 0a 20 20 |ind myself.''. | 00002e10 20 20 20 20 20 54 68 69 73 20 69 73 20 61 6c 77 | This is alw| 00002e20 61 79 73 20 74 72 75 65 20 75 6e 64 65 72 20 55 |ays true under U| 00002e30 6e 69 78 20 61 6e 64 20 6d 61 79 20 62 65 20 74 |nix and may be t| 00002e40 72 75 65 20 69 6e 20 73 6f 6d 65 20 63 61 73 65 |rue in some case| 00002e50 73 20 75 6e 64 65 72 20 20 4d 53 2d 0a 20 20 20 |s under MS-. | 00002e60 20 20 20 20 44 4f 53 2c 20 20 64 65 70 65 6e 64 | DOS, depend| 00002e70 69 6e 67 20 20 6f 6e 20 20 74 68 65 20 63 6f 6d |ing on the com| 00002e80 70 69 6c 65 72 20 75 73 65 64 20 28 4d 69 63 72 |piler used (Micr| 00002e90 6f 73 6f 66 74 20 43 20 66 75 6c 6c 79 20 71 75 |osoft C fully qu| 00002ea0 61 6c 69 66 69 65 73 20 74 68 65 0a 20 20 20 20 |alifies the. | 00002eb0 20 20 20 70 72 6f 67 72 61 6d 20 6e 61 6d 65 2c | program name,| 00002ec0 20 62 75 74 20 6f 74 68 65 72 20 63 6f 6d 70 69 | but other compi| 00002ed0 6c 65 72 73 20 6d 61 79 20 6e 6f 74 29 2e 20 20 |lers may not). | 00002ee0 55 6e 64 65 72 20 4f 53 2f 32 20 20 61 6e 64 20 |Under OS/2 and | 00002ef0 20 4e 54 20 20 74 68 65 72 65 0a 20 20 20 20 20 | NT there. | 00002f00 20 20 61 72 65 20 20 6f 70 65 72 61 74 69 6e 67 | are operating| 00002f10 2d 73 79 73 74 65 6d 20 20 63 61 6c 6c 73 20 61 |-system calls a| 00002f20 76 61 69 6c 61 62 6c 65 20 74 68 61 74 20 70 72 |vailable that pr| 00002f30 6f 76 69 64 65 20 74 68 65 20 66 75 6c 6c 20 70 |ovide the full p| 00002f40 61 74 68 20 6e 61 6d 65 2c 0a 20 20 20 20 20 20 |ath name,. | 00002f50 20 73 6f 20 74 68 65 20 61 72 63 68 69 76 65 20 | so the archive | 00002f60 6d 61 79 20 62 65 20 69 6e 76 6f 6b 65 64 20 66 |may be invoked f| 00002f70 72 6f 6d 20 61 6e 79 77 68 65 72 65 20 69 6e 20 |rom anywhere in | 00002f80 74 68 65 20 20 75 73 65 72 27 73 20 20 70 61 74 |the user's pat| 00002f90 68 2e 20 20 20 54 68 65 0a 20 20 20 20 20 20 20 |h. 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