ZIP - Revision history

Jsummers: /* Software */

2026-01-08T18:17:01Z

‎Software

Jsummers: /* Extensible data fields */

2025-08-30T14:31:07Z

‎Extensible data fields

Jsummers: /* Sample files */

2025-08-05T15:46:11Z

‎Sample files

Jsummers: /* Multi-part archives */

2025-07-25T15:35:35Z

‎Multi-part archives

Sembiance: /* Sample files */

2025-05-30T14:21:25Z

‎Sample files

Tomxe at 20:59, 5 October 2024

2024-10-05T20:59:55Z

Jsummers at 14:49, 5 October 2024

2024-10-05T14:49:10Z

Jsummers: /* Disambiguation */

2023-12-28T16:02:40Z

‎Disambiguation

Dexvertbot: /* Sample files */

2023-12-28T04:14:11Z

‎Sample files

Polluks: /* Software */ XAD

2023-11-16T12:16:36Z

‎Software: XAD

@@ Line 277: / Line 277: @@
 ** See [[PKZIP#Software]] for more versions.
 * [[Konvertor]]
-* {{Deark}} (for analysis, or converting old compression methods)
+* {{Deark}} (for analysis, converting old compression methods, converting SFX to ZIP, combining multi-volume archives, ...)
 * [{{SACFTPURL|pack|pcdezip.zip}} PCDEZIP] - Source code and DOS binary to decompress ''Deflate'' and all older methods (1993)
 * {{XAD}}

@@ Line 194: / Line 194: @@
 |-
 |0x7875 "<code>ux</code>" || || Info-ZIP Unix (new) || Info-ZIP || Info-ZIP
 |-
 |0xa11e || || Data Stream Alignment || APPNOTE || APPNOTE

@@ Line 281: / Line 281: @@
 == Sample files ==
-* https://github.com/corkami/pocs/tree/master/zip
+''ZIP files are common. This section might be oriented toward unusual types of ZIP files.''
-* Examples that use the uncommon "Reduce" compression scheme: {{CdTextfiles|ccbwindows93/CORELDRA/VISA_CRD.ZIP|VISA_CRD.ZIP}}, {{CdTextfiles|librisbritannia/GRAPHICS/CLIPMAC/1608A.ZIP|1608A.ZIP}} → D1-MAC.ZIP
 * {{DexvertSamples|archive/zip}}
-* {{DexvertSamples|archive/zipItSEA}}
+* https://github.com/corkami/pocs/tree/master/zip
 == Links ==

@@ Line 209: / Line 209: @@
 The first fragment of a multi-part archive usually begins with signature bytes {{magic|'P' 'K' 0x07 0x08}}. This signature can be present even for single-part archives, if the disk spanning feature was enabled but turned out not to be needed.
-The APPNOTE documentation (at least v4.5+) also mentions signature {{magic|'P' 'K' 0x30 0x30}}, calling it the "temporary spanning marker", but more research is needed to understand when it is used.
+Only the last fragment contains the usual {{magic|'P' 'K' 0x05 0x06}} signature. Fragments that are neither first nor last don't really have any identifying signatures.
-Fragments of a multi-part archive that are neither first nor last may not have any identifying signatures.
+Classic versions of PKZIP will only create multi-part archives when writing to a floppy disk. Since around the year 2000, though, the ZIP specification has also approved "split" archives. Split archives are essentially the same thing as spanned archives, just with different file-naming and volume-labeling conventions, and a more flexible fragment size.
-Only the last fragment necessarily contains the usual {{magic|'P' 'K' 0x05 0x06}} signature.
+Some versions of PKZIP for Windows (e.g. 2.60) feature automatic floppy disk spanning, so they don't know in advance whether to use the {{magic|'P' 'K' 0x07 0x08}} signature. Instead, when a ZIP file is created on a floppy disk, the file will initially start with a placeholder "temporary spanning marker" signature: {{magic|'P' 'K' 0x30 0x30}}. This will be overwritten with {{magic|'P' 'K' 0x07 0x08}} only if multiple floppy disks turn out to be needed.
 === Self-extracting archives ===

@@ Line 282: / Line 282: @@
 * Examples that use the uncommon "Reduce" compression scheme: {{CdTextfiles|ccbwindows93/CORELDRA/VISA_CRD.ZIP|VISA_CRD.ZIP}}, {{CdTextfiles|librisbritannia/GRAPHICS/CLIPMAC/1608A.ZIP|1608A.ZIP}} → D1-MAC.ZIP
 * {{DexvertSamples|archive/zip}}
 == Links ==

@@ Line 24: / Line 24: @@
 == Discussion ==
-ZIP was created in 1989 as the native format of the PKZIP program, which was introduced by Phil Katz (with co-creator Gary Conway) in the wake of a lawsuit (which he lost) against him by the makers of the then-popular [[ARC (compression format)|ARC]] program (and file format) for copyright and trademark infringement in an earlier program [[PKARC]] which had been file-compatible with ARC. This resulted in Katz creating a new file format, which rapidly overtook ARC in popularity (to a large extent because of BBS sysops, then the primary users of such compression, resenting the lawsuit). Many programs have been released for a variety of operating systems to compress and decompress ZIP files, and native support for the format is built into several popular operating systems.
+ZIP was created in 1989 as the native format of the [[PKZIP]] program, which was introduced by Phil Katz (with co-creator Gary Conway) in the wake of a lawsuit (which he lost) against him by the makers of the then-popular [[ARC (compression format)|ARC]] program (and file format) for copyright and trademark infringement in an earlier program [[PKARC]] which had been file-compatible with ARC. This resulted in Katz creating a new file format, which rapidly overtook ARC in popularity (to a large extent because of BBS sysops, then the primary users of such compression, resenting the lawsuit). Many programs have been released for a variety of operating systems to compress and decompress ZIP files, and native support for the format is built into several popular operating systems.
 ZIP implementations vary in their support for features in the specification from PKWARE (see "APPNOTE" in the Specifications section below), particularly features added since version 2 (1993)<!--, some of which are protected by patents and require licensing-->. Many implementations limit the use of compression to the [[DEFLATE]] algorithm, introduced with version 2. Extensions incorporated into the specification that have been widely adopted include large files (using a technique known as ZIP64), and filenames in [[UTF-8]].
@@ Line 268: / Line 268: @@
 ** [http://search.cpan.org/~vspader/Archive-ZZip-0.13/ZZip/ZZip.pm Archive::ZZip]: Perl bindings for zziplib
 * [https://github.com/richgel999/miniz miniz]
-* PKZIP
+* [[PKZIP]]
-** For DOS (main line): {{CdTextfiles|swinnund/disk3/FILEUTIL/PKZ080.ZIP|0.80-beta}} · {{CdTextfiles|rbbsv3n1/pool/pkz090.exe|0.90}} · {{CdTextfiles|rbbsv3n1/pool/pkz092.exe|0.92}} · {{CdTextfiles|rbbsv3n1/pool/pkz101.exe|1.01}} · {{CdTextfiles|rbbsv3n1/pool/pkz102.exe|1.02}} · '''{{CdTextfiles|rbbsv3n1/pool/pkz110.exe|1.10}}''' · {{CdTextfiles|somuch/smsharew2/UTIL2/PKZ193A.EXE|1.93-alpha}} · {{CdTextfiles|20mnn/ARCHIVE/PKZ204C.EXE|2.04c}} · {{CdTextfiles|megmonster/ARCHIVE/PKZ204E.EXE|2.04e}} · '''{{CdTextfiles|simtel/simtel20/MSDOS/ZIP/PKZ204G.EXE|2.04g}}''' · {{CdTextfiles|simtel/simtel0101/simtel/arcers/pk250dos.exe|2.50}}
+** For DOS: {{CdTextfiles|rbbsv3n1/pool/pkz110.exe|1.10}} · {{CdTextfiles|simtel/simtel20/MSDOS/ZIP/PKZ204G.EXE|2.04g}} · {{CdTextfiles|simtel/simtel0101/simtel/arcers/pk250dos.exe|2.50}}
-** For Windows console: [{{SACFTPURL|pack|pk250c32.exe}} 2.50] · [{{SACFTPURL|pack|pkzc400s.exe}} 4.00]
+** For Windows console: [{{SACFTPURL|pack|pkzc400s.exe}} 4.00]
-** [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=491 Various versions at old-dos.ru]
+** See [[PKZIP#Software]] for more versions.
-** {{CdTextfiles|simtel/simtel9211/msdos/zip/pkz110eu.exe|v1.10 DOS "export" version}} (no encryption)
 * [[Konvertor]]
 * {{Deark}} (for analysis, or converting old compression methods)

@@ Line 14: / Line 14: @@
 == Disambiguation ==
-There are many other things, related or not, whose names use the word "Zip".
+There are many other things, related or not, whose names use the word "Zip". Only a few are listed here.
 * [[Zip disk]], an unrelated disk cartridge unit
 * "ZIP compression" can sometimes refer to [[DEFLATE]], or something based on it ([[zlib]], [[Gzip]]).