<s>
Info-ZIP	B-Application
is	O
a	O
set	O
of	O
open-source	B-Application
software	I-Application
to	O
handle	O
ZIP	B-General_Concept
archives	I-General_Concept
.	O
</s>
<s>
It	O
consists	O
of	O
4	O
separately-installable	O
packages	O
:	O
the	O
Zip	B-General_Concept
and	O
UnZip	B-General_Concept
command-line	O
utilities	O
;	O
and	O
WiZ	B-Application
and	O
MacZip	O
,	O
which	O
are	O
graphical	B-Application
user	I-Application
interfaces	I-Application
for	O
archiving	O
programs	O
in	O
Microsoft	B-Application
Windows	I-Application
and	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
respectively	O
.	O
</s>
<s>
Info-ZIP	B-Application
'	O
s	O
Zip	B-General_Concept
and	O
UnZip	B-General_Concept
have	O
been	O
ported	O
to	O
dozens	O
of	O
computing	B-Device
platforms	I-Device
.	O
</s>
<s>
The	O
UnZip	B-General_Concept
web	O
page	O
describes	O
UnZip	B-General_Concept
as	O
"	O
The	O
Third	O
Most	O
Portable	O
Program	O
in	O
the	O
World	O
"	O
,	O
surpassed	O
by	O
Hello	O
World	O
,	O
C-Kermit	B-Protocol
,	O
and	O
possibly	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
The	O
"	O
zip	B-General_Concept
"	O
and	O
"	O
unzip	B-General_Concept
"	O
programs	O
included	O
with	O
most	O
Linux	B-Operating_System
and	O
Unix	O
distributions	O
are	O
Info-ZIP	B-Application
'	O
s	O
Zip	B-General_Concept
and	O
UnZip	B-General_Concept
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
Info-ZIP	B-Application
releases	O
themselves	O
,	O
parts	O
of	O
Info-ZIP	B-Application
,	O
including	O
zlib	B-Language
,	O
have	O
been	O
used	O
in	O
numerous	O
other	O
file	B-Application
archivers	I-Application
and	O
other	O
programs	O
.	O
</s>
<s>
Many	O
Info-ZIP	B-Application
programmers	O
have	O
also	O
been	O
involved	O
in	O
other	O
projects	O
closely	O
related	O
to	O
the	O
DEFLATE	B-Algorithm
compression	I-Algorithm
algorithm	I-Algorithm
,	O
such	O
as	O
the	O
PNG	O
image	O
format	O
and	O
the	O
zlib	B-Language
software	O
library	O
.	O
</s>
<s>
The	O
UnZip	B-General_Concept
package	O
also	O
includes	O
three	O
additional	O
utilities	O
:	O
</s>
<s>
fUnZip	O
extracts	O
a	O
file	O
in	O
a	O
ZIP	B-General_Concept
or	O
gzip	B-Application
file	O
directly	O
to	O
output	O
from	O
archives	O
or	O
other	O
piped	O
input	O
.	O
</s>
<s>
UnZipSFX	O
is	O
software	O
to	O
make	O
a	O
ZIP	B-General_Concept
file	I-General_Concept
into	O
an	O
executable	O
self-extracting	B-General_Concept
archive	I-General_Concept
.	O
</s>
<s>
ZipInfo	O
outputs	O
,	O
in	O
a	O
variety	O
of	O
formats	O
,	O
information	O
about	O
ZIP	B-General_Concept
files	I-General_Concept
and	O
their	O
contents	O
.	O
</s>
<s>
The	O
Zip	B-General_Concept
package	O
includes	O
three	O
additional	O
utilities	O
:	O
</s>
<s>
ZipCloak	O
adds	O
or	O
removes	O
password	O
encryption	O
from	O
file	O
in	O
a	O
ZIP	B-General_Concept
archive	I-General_Concept
.	O
</s>
<s>
ZipNote	O
allows	O
the	O
modification	O
of	O
comment	O
fields	O
in	O
ZIP	B-General_Concept
archives	I-General_Concept
.	O
</s>
<s>
ZipSplit	O
splits	O
a	O
ZIP	B-General_Concept
archive	I-General_Concept
into	O
sections	O
for	O
separate	O
disks	O
or	O
downloads	O
.	O
</s>
<s>
UnZip	B-General_Concept
1.0	O
(	O
March	O
1989	O
)	O
was	O
released	O
by	O
Samuel	O
M	O
.	O
Smith	O
.	O
</s>
<s>
It	O
was	O
written	O
in	O
Pascal	B-Application
and	O
C	B-Language
.	O
Pascal	B-Application
was	O
abandoned	O
soon	O
after	O
.	O
</s>
<s>
UnZip	B-General_Concept
2.0	O
(	O
September	O
1989	O
)	O
was	O
released	O
by	O
Samuel	O
M	O
.	O
Smith	O
.	O
</s>
<s>
It	O
included	O
support	O
for	O
the	O
"	O
unimploding	O
"	O
(	O
method	O
6	O
)	O
introduced	O
by	O
PKZIP	B-Application
1.01	O
.	O
</s>
<s>
UnZip	B-General_Concept
2.0a	O
(	O
December	O
1989	O
)	O
was	O
released	O
by	O
Carl	O
Mascott	O
and	O
John	O
Cowan	O
.	O
</s>
<s>
UnZip	B-General_Concept
3.0	O
(	O
May	O
1990	O
)	O
became	O
the	O
first	O
public	O
release	O
by	O
Info-ZIP	B-Application
group	O
.	O
</s>
<s>
UnZip	B-General_Concept
4.0	O
(	O
December	O
1990	O
)	O
adds	O
support	O
of	O
"	O
central	O
directory	O
"	O
within	O
.ZIP	B-General_Concept
archive	O
.	O
</s>
<s>
UnZip	B-General_Concept
5.0	O
(	O
August	O
1992	O
)	O
introduces	O
support	O
of	O
DEFLATE	B-Algorithm
(	O
method	O
8	O
)	O
compression	O
method	O
,	O
used	O
in	O
PKZIP	B-Application
1.93a	O
.	O
</s>
<s>
Method	O
8	O
has	O
become	O
the	O
de	O
facto	O
base	O
standard	O
for	O
ZIP	B-General_Concept
archives	I-General_Concept
.	O
</s>
<s>
In	O
1994	O
and	O
1995	O
Info-ZIP	B-Application
turned	O
a	O
corner	O
,	O
and	O
effectively	O
became	O
the	O
de	O
facto	O
ZIP	B-General_Concept
program	O
on	O
non-MS-DOS	O
systems	O
.	O
</s>
<s>
A	O
huge	O
number	O
of	O
ports	O
were	O
released	O
that	O
year	O
,	O
including	O
numerous	O
minicomputers	B-Architecture
,	O
mainframes	B-Architecture
and	O
practically	O
every	O
microcomputer	B-Architecture
ever	O
developed	O
.	O
</s>
<s>
UnZip	B-General_Concept
5.41	O
(	O
April	O
2000	O
)	O
was	O
relicensed	O
under	O
Info-ZIP	B-Application
License	O
.	O
</s>
<s>
UnZip	B-General_Concept
5.50	O
(	O
February	O
2002	O
)	O
adds	O
support	O
of	O
Deflate64	O
(	O
method	O
9	O
)	O
decompression	O
.	O
</s>
<s>
UnZip	B-General_Concept
6.0	O
adds	O
support	O
of	O
"	O
Zip64	O
"	O
.ZIP	B-General_Concept
archive	O
and	O
bzip2	O
(	O
method	O
12	O
)	O
decompression	O
.	O
</s>
<s>
Support	O
for	O
bzip2-style	O
compression	O
was	O
also	O
in	O
Zip	B-General_Concept
from	O
3.0f	O
beta	O
.	O
</s>
<s>
Zip	B-General_Concept
1.9	O
(	O
August	O
1992	O
)	O
introduces	O
support	O
of	O
DEFLATE	B-Algorithm
(	O
method	O
8	O
)	O
compression	O
method	O
.	O
</s>
<s>
Method	O
8	O
has	O
become	O
the	O
de	O
facto	O
base	O
standard	O
for	O
ZIP	B-General_Concept
archives	I-General_Concept
.	O
</s>
<s>
Zip	B-General_Concept
2.0	O
(	O
September	O
1993	O
)	O
has	O
many	O
portability	O
improvements	O
.	O
</s>
<s>
Zip	B-General_Concept
2.1	O
(	O
May	O
1996	O
)	O
added	O
new	O
"	O
UNIX	O
"	O
time	O
info	O
to	O
preserve	O
file	O
times	O
across	O
timezones	O
and	O
OSes	O
.	O
</s>
<s>
Zip	B-General_Concept
2.3	O
(	O
December	O
1999	O
)	O
was	O
the	O
first	O
Info-ZIP	B-Application
archiver	O
tool	O
under	O
the	O
new	O
BSD-like	B-License
Info-ZIP	B-Application
License	O
.	O
</s>
<s>
WiZ	B-Application
4.0	O
(	O
November	O
1997	O
)	O
was	O
released	O
by	O
Info-ZIP	B-Application
.	O
</s>
<s>
WiZ	B-Application
5.01	O
(	O
April	O
2000	O
)	O
was	O
relicensed	O
under	O
Info-ZIP	B-Application
License	O
.	O
</s>
<s>
MacZip	O
1.05	O
(	O
July	O
2000	O
)	O
was	O
released	O
under	O
Info-ZIP	B-Application
License	O
.	O
</s>
<s>
As	O
a	O
slowly-updated	O
open	B-Application
software	I-Application
package	O
,	O
many	O
patches	O
have	O
been	O
written	O
by	O
various	O
Linux	B-Operating_System
distributions	O
to	O
improve	O
info-zip	B-Application
tools	O
.	O
</s>
<s>
In	O
addition	O
,	O
from	O
2015	O
to	O
2019	O
,	O
14	O
unzip	B-General_Concept
vulnerabilities	O
have	O
been	O
published	O
on	O
the	O
CVE	O
list	O
without	O
version	O
or	O
website	O
updates	O
from	O
info-zip	B-Application
.	O
</s>
<s>
(	O
Three	O
CVEs	O
from	O
2014	O
in	O
oCERT-2014-011	O
are	O
left	O
out	O
of	O
most	O
statistics	O
;	O
info-zip	B-Application
did	O
provide	O
patches	O
on	O
their	O
now-defunct	O
forum	O
.	O
)	O
</s>
<s>
Mark	O
Adler	O
has	O
a	O
set	O
of	O
patches	O
for	O
unzip	B-General_Concept
6.0	O
that	O
detects	O
zip	B-General_Concept
bombs	O
of	O
the	O
overlapping	O
type	O
.	O
</s>
<s>
The	O
Debian	O
project	O
provides	O
various	O
patches	O
to	O
correct	O
typographical	O
errors	O
and	O
security	O
issues	O
,	O
including	O
the	O
17	O
unzip	B-General_Concept
CVEs	O
.	O
</s>
<s>
To	O
deal	O
with	O
pre-UTF-8	O
Zip	B-General_Concept
files	I-General_Concept
created	O
on	O
other	O
code	O
pages	O
,	O
Giovanni	O
Scafora	O
created	O
a	O
patch	O
that	O
hooks	O
unzip	B-General_Concept
up	O
with	O
iconv	B-Language
for	O
encoding	O
conversion	O
.	O
</s>
<s>
A	O
version	O
of	O
the	O
patch	O
combined	O
with	O
CVE	O
mitigations	O
are	O
provided	O
as	O
a	O
User	O
Package	O
in	O
Arch	O
Linux	B-Operating_System
.	O
</s>
<s>
The	O
Fedora	O
project	O
(	O
an	O
upstream	O
of	O
Red	O
Hat	O
Enterprise	O
Linux	B-Operating_System
)	O
applies	O
Adler	O
's	O
patch	O
,	O
most	O
of	O
the	O
Debian	O
patches	O
(	O
or	O
similar	O
)	O
,	O
as	O
well	O
as	O
extra	O
security	O
patches	O
like	O
a	O
stack	O
non-execution	O
patch	O
to	O
their	O
unzip	B-General_Concept
.	O
</s>
<s>
The	O
zip	B-General_Concept
patches	O
are	O
similar	O
to	O
Debian	O
patches	O
.	O
</s>
<s>
Some	O
official	O
improvements	O
to	O
zip	B-General_Concept
and	O
unzip	B-General_Concept
are	O
stuck	O
in	O
beta-stage	O
as	O
zip	B-General_Concept
3.1c	O
and	O
unzip	B-General_Concept
6.10b	O
from	O
2015	O
.	O
</s>
<s>
Among	O
other	O
things	O
,	O
both	O
added	O
support	O
for	O
PPMd8	O
and	O
LZMA	O
compressions	O
in	O
files	O
,	O
support	O
for	O
AES	O
encryption	O
,	O
and	O
included	O
iconv-based	O
Unicode	O
improvements	O
(	O
based	O
on	O
unzip-iconv	O
)	O
.	O
</s>
<s>
A	O
newer	O
release	O
candidate	O
,	O
Zip	B-General_Concept
3.1d	O
,	O
appeared	O
on	O
the	O
official	O
FTP	O
site	O
in	O
2015	O
,	O
but	O
the	O
SourceForge	O
page	O
was	O
not	O
updated	O
.	O
</s>
<s>
Partially	O
due	O
to	O
the	O
added	O
compressors	O
,	O
the	O
zipped	B-General_Concept
file	I-General_Concept
size	O
increased	O
from	O
1.4	O
MB	O
(	O
3.1c	O
)	O
to	O
2.9	O
MB	O
(	O
3.1d	O
)	O
.	O
</s>
<s>
The	O
antinode.info	O
FTP	O
site	O
seems	O
to	O
be	O
hosting	O
an	O
even	O
more	O
cutting-edge	O
source	O
of	O
info-zip	B-Application
utilities	O
.	O
</s>
<s>
Individual	O
revisions	O
are	O
organized	O
into	O
folders	O
containing	O
files	O
differing	O
from	O
the	O
previous	O
revision	O
,	O
and	O
zip	B-General_Concept
archives	I-General_Concept
for	O
sources	O
are	O
occasionally	O
released	O
.	O
</s>
<s>
,	O
the	O
site	O
provides	O
Unzip	B-General_Concept
6.10c	O
(	O
rev	O
.	O
</s>
<s>
25	O
,	O
21	O
Dec	O
2018	O
)	O
and	O
an	O
unarchived	O
development	O
version	O
of	O
Zip	B-General_Concept
3.1e	O
from	O
August	O
2019	O
.	O
</s>
<s>
Schweda	O
is	O
a	O
member	O
of	O
the	O
original	O
info-zip	B-Application
team	O
.	O
</s>
<s>
FreeBSD	B-Operating_System
has	O
opted	O
to	O
replace	O
info-zip	B-Application
utilities	O
.	O
</s>
<s>
It	O
produces	O
a	O
command-line	O
compatible	O
version	O
of	O
based	O
on	O
libarchive	O
,	O
which	O
also	O
supports	O
zipx	B-General_Concept
and	O
AES	O
.	O
</s>
