http://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&feed=atom&action=historyARC (compression format) - Revision history2024-03-28T17:08:39ZRevision history for this page on the wikiMediaWiki 1.19.2http://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=47240&oldid=prevDexvertbot: /* Sample files */2023-12-28T04:12:47Z<p><span dir="auto"><span class="autocomment">Sample files</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://www.dan.info/sampledata/POLIPREF.ARC POLIPREF.ARC]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://www.dan.info/sampledata/POLIPREF.ARC POLIPREF.ARC]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfilesURL|pcblue/}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfilesURL|pcblue/}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* <del class="diffchange diffchange-inline">https://telparia.com/fileFormatSamples/</del>archive/arc<del class="diffchange diffchange-inline">/</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* <ins class="diffchange diffchange-inline">{{DexvertSamples|</ins>archive/arc<ins class="diffchange diffchange-inline">}}</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Programs and Utilities ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Programs and Utilities ==</div></td></tr>
</table>Dexvertbothttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=45877&oldid=prevJsummers at 13:23, 19 October 20232023-10-19T13:23:26Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:ARC (file format)|ARC (file format): Wikipedia]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:ARC (file format)|ARC (file format): Wikipedia]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.esva.net/~thom/arclicense.html Original ARC license]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.esva.net/~thom/arclicense.html Original ARC license]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">* [http://textfiles.com/computers/sea.txt SEA vs. PKWARE suit commentary] (which worries that tech people will end up spending more time in court than working on programs in the future, and is quaintly old-fashioned in that it refers to a legal case that was settled for $62,500, not the billions that are involved in modern-day tech legal cases)</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">* [https://www.youtube.com/watch?v=_zvFeHtcxuA BBS Documentary Part 8: Compression]</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.textfiles.com/programming/FORMATS/arc-lbr.pro ARC vs LBR comparison (1985)]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.textfiles.com/programming/FORMATS/arc-lbr.pro ARC vs LBR comparison (1985)]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== Further reading ==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [http://textfiles.com/computers/sea.txt SEA vs. PKWARE suit commentary] <!-- (which worries that tech people will end up spending more time in court than working on programs in the future, and is quaintly old-fashioned in that it refers to a legal case that was settled for $62,500, not the billions that are involved in modern-day tech legal cases) --></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [http://ascii.textfiles.com/archives/2398 ARC/ZIP Perspective by Dean W. Cooper]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [https://www.youtube.com/watch?v=_zvFeHtcxuA BBS Documentary Part 8: Compression]</ins></div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=44128&oldid=prevJsummers: /* Programs and Utilities */2023-02-13T18:49:48Z<p><span dir="auto"><span class="autocomment">Programs and Utilities</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 18:49, 13 February 2023</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://sourceforge.net/projects/arc/ ARC (for Unix)] - Portable software based on ARC source code</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://sourceforge.net/projects/arc/ ARC (for Unix)] - Portable software based on ARC source code</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* ARC - DOS binaries</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* ARC - DOS binaries</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v3.10 (1985-05-01): See [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=699 old-dos.ru]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v4.11 (1985-07-02): [https://archive.org/details/science-libraryb Libris Britannia 4] → science library(b)/COMMUNIC/0132.ZIP → ARC.EXE</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v4.11 (1985-07-02): [https://archive.org/details/science-libraryb Libris Britannia 4] → science library(b)/COMMUNIC/0132.ZIP → ARC.EXE</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v4.20 (1985-07-16): {{CdTextfiles|pcsig12/CLA/DISK0420.ZIP|DISK0420.ZIP}} → ARC.EXE</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v4.30 (1985-08-22): {{CdTextfiles|pcblueii/PCBLUE/VOL148.ZIP|VOL148.ZIP}} → ARC.EXE</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v4.50 (1985-11-18): {{CdTextfiles|californiacollect/his033/sideway.zip|sideway.zip}} → SIDEWRIT.ARC → ARC.EXE</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v4.50 (1985-11-18): {{CdTextfiles|californiacollect/his033/sideway.zip|sideway.zip}} → SIDEWRIT.ARC → ARC.EXE</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v4.52 (1985-12-04): See [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=699 old-dos.ru]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v5.00 (1986-01-21): {{CdTextfiles|pcsig12/CLA/DISK1000.ZIP|DISK1000.ZIP}} → ARC.EXE</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc51.exe|v5.10}} (1986-01-31) (bare executable)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc51.exe|v5.10}} (1986-01-31) (bare executable)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc512.com|v5.12}} (1986-02-05) (For self-extraction to work, must be renamed to "ARC51.COM".)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc512.com|v5.12}} (1986-02-05) (For self-extraction to work, must be renamed to "ARC51.COM".)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc520.com|v5.20}} (1986-10-24)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc520.com|v5.20}} (1986-10-24)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v5.21 (1987-04-22): [https://archive.org/details/HAMCALL_CD-ROM_Buckmaster_April_1991 HAMCALL CD ROM April 1991] → HAMCALL CD-ROM (Buckmaster)(April 1991).{BIN,CUE} → ziparc/arc/arc.exe</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** v5.21 (1987-04-22): [https://archive.org/details/HAMCALL_CD-ROM_Buckmaster_April_1991 HAMCALL CD ROM April 1991] → HAMCALL CD-ROM (Buckmaster)(April 1991).{BIN,CUE} → ziparc/arc/arc.exe</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>** {{CdTextfiles|pcmedic/utils/compress/arc601.exe|v6.01}} (Dated "January of 1989", but timestamps suggest 1989-02-23<del class="diffchange diffchange-inline">.</del>)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">** v6.00 (Dated "January of 1989", but timestamps suggest 1989-02-10): [https://archive.org/details/PCMCDS Discos PCManía] → PCMania CD15.nrg → sharewre/zip/arc600.exe</ins></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14<del class="diffchange diffchange-inline">.</del>)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>** {{CdTextfiles|pcmedic/utils/compress/arc601.exe|v6.01}} (Dated "January of 1989", but timestamps suggest 1989-02-23)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** ARC+Plus v7.10 (1990-10-04): [https://archive.org/details/floppycollection_NumberedFloppies] → 370.img → ARC71.ZIP</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** ARC+Plus v7.10 (1990-10-04): [https://archive.org/details/floppycollection_NumberedFloppies] → 370.img → ARC71.ZIP</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=44124&oldid=prevJsummers: /* Programs and Utilities */2023-02-13T13:56:41Z<p><span dir="auto"><span class="autocomment">Programs and Utilities</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://sourceforge.net/projects/arc/ ARC (for Unix)] - Portable software based on ARC source code</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://sourceforge.net/projects/arc/ ARC (for Unix)] - Portable software based on ARC source code</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* ARC - DOS binaries</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* ARC - DOS binaries</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v4.11 (1985-07-02): [https://archive.org/details/science-libraryb Libris Britannia 4] → science library(b)/COMMUNIC/0132.ZIP → ARC.EXE</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v4.50 (1985-11-18): {{CdTextfiles|californiacollect/his033/sideway.zip|sideway.zip}} → SIDEWRIT.ARC → ARC.EXE</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc51.exe|v5.10}} (1986-01-31) (bare executable)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc51.exe|v5.10}} (1986-01-31) (bare executable)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc512.com|v5.12}} (1986-02-05) (For self-extraction to work, must be renamed to "ARC51.COM".)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc512.com|v5.12}} (1986-02-05) (For self-extraction to work, must be renamed to "ARC51.COM".)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc520.com|v5.20}} (1986-10-24)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|originalsw/25/arc520.com|v5.20}} (1986-10-24)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** v5.21 (1987-04-22): [https://archive.org/details/HAMCALL_CD-ROM_Buckmaster_April_1991 HAMCALL CD ROM April 1991] → HAMCALL CD-ROM (Buckmaster)(April 1991).{BIN,CUE} → ziparc/arc/arc.exe</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|pcmedic/utils/compress/arc601.exe|v6.01}} (Dated "January of 1989", but timestamps suggest 1989-02-23.)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|pcmedic/utils/compress/arc601.exe|v6.01}} (Dated "January of 1989", but timestamps suggest 1989-02-23.)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14.)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14.)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** ARC+Plus v7.10 (1990-10-04): [https://archive.org/details/floppycollection_NumberedFloppies] → 370.img → ARC71.ZIP</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** {{CdTextfiles|svplatinum/CDR31/ARC712.ZIP|ARC+Plus v7.12}} (~1991-01-24)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=699 Various versions, at old-dos.ru]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=699 Various versions, at old-dos.ru]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|pcmedic/utils/compress/arc520s.zip|ARC v5.20 source code}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|pcmedic/utils/compress/arc520s.zip|ARC v5.20 source code}}</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=42950&oldid=prevJsummers: Updates due to new PKARC/PKPAK article2022-07-12T19:51:46Z<p>Updates due to new PKARC/PKPAK article</p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 19:51, 12 July 2022</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>ARC was for a time (1985-89) the leading file archiving and file compression format in the [http://en.wikipedia.org/wiki/Bulletin_board_system BBS] world, replacing the formats used by earlier utilities which generally only did one of the two functions (either combining multiple files in one file for convenient download, or shortening the file length to take less download time and disk space).  Combining the two functions in one utility simplified the process of preparing files for download and extracting them at the other end, leading to a rapid rise in popularity for the utility (also called ARC) and format both.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>ARC was for a time (1985-89) the leading file archiving and file compression format in the [http://en.wikipedia.org/wiki/Bulletin_board_system BBS] world, replacing the formats used by earlier utilities which generally only did one of the two functions (either combining multiple files in one file for convenient download, or shortening the file length to take less download time and disk space).  Combining the two functions in one utility simplified the process of preparing files for download and extracting them at the other end, leading to a rapid rise in popularity for the utility (also called ARC) and format both.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>However, the ARC format suffered an equally rapid decline in its popularity after the company that published the ARC utility (called System Enhancement Associates or SEA, run by Thom Henderson who was very active in FidoNet) brought a successful trademark and copyright suit against rival Phil Katz, whose PKARC and PKXARC utilities were compatible with the ARC file format. The lawsuit was widely regarded by the BBS community as being a "David vs. Goliath" case of a faceless corporation bullying a "little guy", though in fact both companies were small, home-based operations.  Nevertheless, the fallout from the suit led to rapid adoption of the competing [[ZIP]] format, introduced by Katz in 1989, and ARC files are no longer commonly encountered.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>However, the ARC format suffered an equally rapid decline in its popularity after the company that published the ARC utility (called System Enhancement Associates or SEA, run by Thom Henderson who was very active in FidoNet) brought a successful trademark and copyright suit against rival Phil Katz, whose <ins class="diffchange diffchange-inline">[[</ins>PKARC<ins class="diffchange diffchange-inline">]] </ins>and PKXARC utilities were compatible with the ARC file format. The lawsuit was widely regarded by the BBS community as being a "David vs. Goliath" case of a faceless corporation bullying a "little guy", though in fact both companies were small, home-based operations.  Nevertheless, the fallout from the suit led to rapid adoption of the competing [[ZIP]] format, introduced by Katz in 1989, and ARC files are no longer commonly encountered.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The fact that archives from an early period of BBSing are often in this format encourages bad puns referring to those who trawl such old archives as "Raiders of the lost ARC."</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The fact that archives from an early period of BBSing are often in this format encourages bad puns referring to those who trawl such old archives as "Raiders of the lost ARC."</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 49:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|8 || Crunched,<br>Packed+Crunched || [[RLE90]] + [[LZW]]. The LZW layer has a dynamic code size. There is a header byte giving the maximum LZW code size, but only 12 bits is generally supported. Introduced in ARC v5.00. This is probably the most common compression method.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|8 || Crunched,<br>Packed+Crunched || [[RLE90]] + [[LZW]]. The LZW layer has a dynamic code size. There is a header byte giving the maximum LZW code size, but only 12 bits is generally supported. Introduced in ARC v5.00. This is probably the most common compression method.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by <ins class="diffchange diffchange-inline">[[</ins>PKARC/PKPAK<ins class="diffchange diffchange-inline">]]</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || [[RLE90]] +  {[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]]}. Supported by ARC 7.x.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || [[RLE90]] +  {[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]]}. Supported by ARC 7.x.</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 84:</td>
<td colspan="2" class="diff-lineno">Line 84:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PK-style comments ===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PK-style comments ===</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The PKARC/PKPAK software supports comments, <del class="diffchange diffchange-inline">apparently </del>using a custom <del class="diffchange diffchange-inline">ARC </del>format extension that appears after the end-of-archive marker.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The PKARC/PKPAK software supports comments, using a custom format extension that appears after the end-of-archive marker. <ins class="diffchange diffchange-inline">Refer to [[PKARC/PKPAK#PK</ins>-<ins class="diffchange diffchange-inline">style </ins>comments<ins class="diffchange diffchange-inline">]]</ins>.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">''Information based on reverse engineering:'' An ARC file with comments ends with an 8</del>-<del class="diffchange diffchange-inline">byte trailer that begins with the signature {{magic|'P' 'K' 0xaa 0x55}}. This is preceded by a sequence of 32-byte ''records'', each containing a comment, except for one that has a special purpose. The last 4 bytes of the file contain the offset of the special record. The special record somehow indicates whether an archive comment and/or file </del>comments <del class="diffchange diffchange-inline">are present. An archive comment, if present, is in the record preceding the special record. File comment records come after the special record, in the same order as the members appear in the ARC file</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PAK extended records ===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PAK extended records ===</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 95:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== See also ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== See also ==</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [[PKARC/PKPAK]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[PAK (ARC extension)]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[PAK (ARC extension)]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Spark]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Spark]]</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 139:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|simtel/simtel9510/disk2/DISC2/ARCHIVER/ARCE41A.ZIP|ARCE v4.1a}} (1992-04-12)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|simtel/simtel9510/disk2/DISC2/ARCHIVER/ARCE41A.ZIP|ARCE v4.1a}} (1992-04-12)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** Included with some versions of ARC.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** Included with some versions of ARC.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* PKARC/PKPAK (DOS binaries)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* PKARC/PKPAK (DOS binaries) <ins class="diffchange diffchange-inline">- See [[</ins>PKARC/PKPAK<ins class="diffchange diffchange-inline">#Software]]</ins>.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">** {{CdTextfiles|microhaus/mhblackbox3/ARCHIVER/PK36.EXE|</del>PKARC <del class="diffchange diffchange-inline">3.6}}</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">** {{CdTextfiles|microhaus</del>/<del class="diffchange diffchange-inline">mhblackbox3/ARCHIVER/PK361.EXE|</del>PKPAK <del class="diffchange diffchange-inline">3</del>.<del class="diffchange diffchange-inline">61}}</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* PAK - See [[PAK (ARC extension)#Software]].</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* PAK - See [[PAK (ARC extension)#Software]].</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">* {{CdTextfiles|simtel/simtel9510/disk2/DISC2/ARCHIVER/SQUASH.ZIP|SQUASH.ZIP}} - Public domain decompression code for one of the compression methods</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=40036&oldid=prevJsummers: /* Format details */2021-06-13T14:41:57Z<p><span dir="auto"><span class="autocomment">Format details</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 14:41, 13 June 2021</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || [[RLE90]] +  {[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]]}. Supported by ARC 7.x.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || [[RLE90]] +  {[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]]}. Supported by ARC 7.x.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|10 || <del class="diffchange diffchange-inline">Crushed,<br>Packed+</del>Crushed || <del class="diffchange diffchange-inline">Used by </del>[[PAK (ARC extension)|PAK]]<del class="diffchange diffchange-inline">. (Apparently based on </del>[[<del class="diffchange diffchange-inline">LZW]] or [[LZMW</del>]].<del class="diffchange diffchange-inline">)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|10 || Crushed ||<ins class="diffchange diffchange-inline">rowspan="2"| </ins>[[PAK (ARC extension)|PAK]] <ins class="diffchange diffchange-inline">extensions: Refer to </ins>[[<ins class="diffchange diffchange-inline">PAK (ARC extension)#Compression methods</ins>]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|11 || Distilled <del class="diffchange diffchange-inline">|| Used by [[PAK (ARC extension)|PAK]]. ([[LZ77 with Huffman coding|LZ77+Huffman]]?)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|11 || Distilled</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|20-29 || || Used/reserved for informational items</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|20-29 || || Used/reserved for informational items</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=39872&oldid=prevSembiance: /* Sample files */2021-05-21T21:47:31Z<p><span dir="auto"><span class="autocomment">Sample files</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:47, 21 May 2021</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://www.dan.info/sampledata/POLIPREF.ARC POLIPREF.ARC]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [https://www.dan.info/sampledata/POLIPREF.ARC POLIPREF.ARC]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfilesURL|pcblue/}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfilesURL|pcblue/}}</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* https://telparia.com/fileFormatSamples/archive/arc/</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Programs and Utilities ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Programs and Utilities ==</div></td></tr>
</table>Sembiancehttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=39759&oldid=prevJsummers at 15:50, 30 April 20212021-04-30T15:50:57Z<p></p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
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<td colspan='2' style="background-color: white; color:black;">Revision as of 15:50, 30 April 2021</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|10 || Trimmed || <del class="diffchange diffchange-inline">Supported by ARC 7.x. (No details known. Seems to involve </del>[[RLE90]]<del class="diffchange diffchange-inline">, and </del>[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]].<del class="diffchange diffchange-inline">)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|10 || Trimmed || [[RLE90]] <ins class="diffchange diffchange-inline">+  {</ins>[[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]]<ins class="diffchange diffchange-inline">}. Supported by ARC 7.x</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (Apparently based on [[LZW]] or [[LZMW]].)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (Apparently based on [[LZW]] or [[LZMW]].)</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|11 || Distilled || Used by [[PAK (ARC extension)|PAK]]. ([[LZ77 with Huffman coding|LZ77+Huffman]]?)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|11 || Distilled || Used by [[PAK (ARC extension)|PAK]]. ([[LZ77 with Huffman coding|LZ77+Huffman]]?)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|20-29 || || <del class="diffchange diffchange-inline">Reserved for extensions </del>/ informational items <del class="diffchange diffchange-inline">(?)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|20-29 || || <ins class="diffchange diffchange-inline">Used</ins>/<ins class="diffchange diffchange-inline">reserved for </ins>informational items</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|20 || Archive info <del class="diffchange diffchange-inline">(?) </del>||  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|20 || Archive info ||  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|21 || Extended file info <del class="diffchange diffchange-inline">(?) </del>||  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|21 || Extended file info ||  </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|22 || OS-specific info || </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|30-39 || || Used/reserved for "control" items</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|30 || Subdir || Nested ARC-like format. Created by the "z" option introduced in ARC v6.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|30 || Subdir || Nested ARC-like format. Created by the "z" option introduced in ARC v6.</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 81:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The ARC v7 software is named "ARC Plus" or "ARC+Plus". By default, it uses Trimmed compression, and the files it creates begin with an archive info item ("compression method" 20). Some format identification tools identify files beginning this way as "ARC+" format.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The ARC v7 software is named "ARC Plus" or "ARC+Plus". By default, it uses Trimmed compression, and the files it creates begin with an archive info item ("compression method" 20). Some format identification tools identify files beginning this way as "ARC+" format.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>ARC v6.02 <del class="diffchange diffchange-inline">seems to understand </del>archive info items, though it's unclear if it ever creates them. It does not support Trimmed decompression.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>ARC v6.02 <ins class="diffchange diffchange-inline">understands </ins>archive info items, though it's unclear if it ever creates them. It does not support Trimmed decompression.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PK-style comments ===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=== PK-style comments ===</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 106:</td>
<td colspan="2" class="diff-lineno">Line 110:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://apple2.org.za/gswv/a2zine/GS.WorldView/Resources/The.MacShrinkIt.Project/ARCHIVES.TXT Archive format info, including ARC]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://apple2.org.za/gswv/a2zine/GS.WorldView/Resources/The.MacShrinkIt.Project/ARCHIVES.TXT Archive format info, including ARC]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/ARC_FILE.INF|ARC-FILE.INF}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/ARC_FILE.INF|ARC-FILE.INF}}</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* {{CdTextfiles|currentsw199407/compress/tm0402.zip|SEA Technical Memorandum #0402}}: ARC 6.02 Extended Data</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Sample files ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Sample files ==</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=39545&oldid=prevJsummers: /* Format details */2021-03-14T18:38:14Z<p><span dir="auto"><span class="autocomment">Format details</span></span></p>
<table class='diff diff-contentalign-left'>
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<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
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<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 18:38, 14 March 2021</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|10 || Trimmed || Supported by ARC 7.x.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|10 || Trimmed || Supported by ARC 7.x. <ins class="diffchange diffchange-inline">(No details known. Seems to involve [[RLE90]], and [[LZ77 with Huffman coding|LZH]] with [[adaptive Huffman coding]].)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (Apparently based on [[LZW]] or [[LZMW]].)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (Apparently based on [[LZW]] or [[LZMW]].)</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARC_(compression_format)&diff=39446&oldid=prevJsummers at 14:55, 4 March 20212021-03-04T14:55:22Z<p></p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 14:55, 4 March 2021</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 33:</td>
<td colspan="2" class="diff-lineno">Line 33:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0 || End-of-archive marker ||</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0 || End-of-archive marker ||</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|1 || Uncompressed || <del class="diffchange diffchange-inline">Uses </del>old-style header.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|1 || Uncompressed || <ins class="diffchange diffchange-inline">With </ins>old-style header.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|2 || Uncompressed ||</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|2 || Uncompressed || <ins class="diffchange diffchange-inline">With new-style header.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|3 || Packed || [[RLE90]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|3 || Packed || [[RLE90]]</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 41:</td>
<td colspan="2" class="diff-lineno">Line 41:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|4 || Squeezed,<br>Packed+Squeezed || [[RLE90]] + [[Huffman coding|Huffman]]. See [[Squeeze#Compressed data section|Squeeze]] for more information.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|4 || Squeezed,<br>Packed+Squeezed || [[RLE90]] + [[Huffman coding|Huffman]]. See [[Squeeze#Compressed data section|Squeeze]] for more information.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|5 || crunched || Hashed [[LZW]] (old hash)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|5 || crunched || Hashed [[LZW]] (old hash)<ins class="diffchange diffchange-inline">. Derived from [[LZWCOM]]. Introduced in ARC v4.00.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|6 || crunched,<br>Packed+crunched || [[RLE90]] + <del class="diffchange diffchange-inline">hashed [[LZW]] (old hash)</del>. <del class="diffchange diffchange-inline">Derived from [[LZWCOM]], and similar </del>to [[Crunch|CP/M Crunch]] <del class="diffchange diffchange-inline">(</del>v1.x<del class="diffchange diffchange-inline">) </del>format.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|6 || crunched,<br>Packed+crunched || [[RLE90]] + <ins class="diffchange diffchange-inline">method 5</ins>. <ins class="diffchange diffchange-inline">Similar </ins>to [[Crunch|CP/M Crunch]] v1.x format<ins class="diffchange diffchange-inline">. Introduced in ARC v4.10</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|7 || crunched,<br>Packed+crunched || [[RLE90]] + hashed [[LZW]] (new hash). Source code comment says "inadvertent release of a developmental copy forces us to leave [method 7] in".</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|7 || crunched,<br>Packed+crunched || [[RLE90]] + hashed [[LZW]] (new hash). Source code comment says "inadvertent release of a developmental copy forces us to leave [method 7] in".</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|8 || Crunched,<br>Packed+Crunched || [[RLE90]] + [[LZW]]. The LZW layer has a dynamic code size. There is a header byte giving the maximum LZW code size, but only 12 bits is generally supported. This is probably the most common compression method.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|8 || Crunched,<br>Packed+Crunched || [[RLE90]] + [[LZW]]. The LZW layer has a dynamic code size. There is a header byte giving the maximum LZW code size, but only 12 bits is generally supported<ins class="diffchange diffchange-inline">. Introduced in ARC v5.00</ins>. This is probably the most common compression method.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|9 || Squashed,<br>Deviant || [[LZW]]. Used by PKARC/PKPAK.</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 53:</td>
<td colspan="2" class="diff-lineno">Line 53:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || Supported by ARC 7.x.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|10 || Trimmed || Supported by ARC 7.x.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (<del class="diffchange diffchange-inline">Based </del>on [[LZW]] or [[LZMW]] <del class="diffchange diffchange-inline">in some way</del>.)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|10 || Crushed,<br>Packed+Crushed || Used by [[PAK (ARC extension)|PAK]]. (<ins class="diffchange diffchange-inline">Apparently based </ins>on [[LZW]] or [[LZMW]].)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|11 || Distilled || Used by [[PAK (ARC extension)|PAK]]. ([[LZ77 with Huffman coding|LZ77+Huffman]]?)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|11 || Distilled || Used by [[PAK (ARC extension)|PAK]]. ([[LZ77 with Huffman coding|LZ77+Huffman]]?)</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 124:</td>
<td colspan="2" class="diff-lineno">Line 124:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14.)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|hof91/arc/arc602.exe|v6.02}} (Dated "January of 1989", but timestamps suggest 1989-03-14.)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>** {{CdTextfiles|rbbsv3n1/atnu/arc602.exe|v6.02}} - Same ARC.EXE as above, but has updated documentation (1989-04-21) and other differences.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">** [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=699 Various versions, at old-dos.ru]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|pcmedic/utils/compress/arc520s.zip|ARC v5.20 source code}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|pcmedic/utils/compress/arc520s.zip|ARC v5.20 source code}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* XARC - A minimal ARC extractor from SEA (DOS binaries)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* XARC - A minimal ARC extractor from SEA (DOS binaries)</div></td></tr>
</table>Jsummers