http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=ARI_%28compressed_archive%29ARI (compressed archive) - Revision history2026-04-19T05:10:55ZRevision history for this page on the wikiMediaWiki 1.19.2http://fileformats.archiveteam.org/index.php?title=ARI_(compressed_archive)&diff=46444&oldid=prevJsummers: CRC info2023-12-13T15:02:42Z<p>CRC info</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''ARI''' is a compressed archive utility for DOS, and associated file format, developed by RAO Inc. It was distributed as freeware, and there was a registered version with more features.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''ARI''' is a compressed archive utility for DOS, and associated file format, developed by RAO Inc. It was distributed as freeware, and there was a registered version with more features.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>== File structure ==</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">== Format details ==</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>== File structure <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>This information (written for the fileformats.archiveteam.org wiki) pertains to ARI and [[ERI (compressed archive)|ERI]], and is based on reverse engineering. It may be incorrect, and is likely incomplete. The software has many features whose effect on the format has not been tested.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>This information (written for the fileformats.archiveteam.org wiki) pertains to ARI and [[ERI (compressed archive)|ERI]], and is based on reverse engineering. It may be incorrect, and is likely incomplete. The software has many features whose effect on the format has not been tested.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 4 || member_size || Total size of this member (header + cdata)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 4 || member_size || Total size of this member (header + cdata)</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>| 4 || || <del class="diffchange diffchange-inline">[[</del>CRC-32<del class="diffchange diffchange-inline">]], unknown algorithm</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>| 4 || || <ins class="diffchange diffchange-inline">"</ins>CRC-32<ins class="diffchange diffchange-inline">" (derived from the uncompressed file data)</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| member_size−(path_len+28) || cdata || Compressed file data</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| member_size−(path_len+28) || cdata || Compressed file data</div></td></tr>
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<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;">=== CRC algorithm ===</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;">Each member file has a "CRC-32" field (as named by the software's "l" command, though it is only a ''CRC'' in the loosest sense of the term). The algorithm and file format are the same for ARI and ERI, but their "l" commands display it differently. Assuming the byte order in the file is 0-1-2-3, ERI displays 3-2-1-0, while ARI displays 1-0-3-2.</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;"></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;">Think of it as four separate 1-byte checksums: ck[0...3]. As each input byte is processed, two of the "ck" bytes are updated: one using an "ADD" function, and one using an "XOR" function.</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;"></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;">The "ADD" function: <code>ck[n] := (ck[n] + source_byte) mod 256</code></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;"></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;">The "XOR" function: <code>ck[n] := ck[n] XOR ((source_byte + 1) mod 256)</code></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;"></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;">The first byte of the file updates ck[0] with ADD, and ck[1] with XOR. The second byte updates ck[1] (ADD) and ck[2] (XOR). Then 2-3 for the third byte, then 3-0, then back to 0-1, repeating with a period of 4 bytes.</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARI_(compressed_archive)&diff=44391&oldid=prevJsummers at 16:25, 6 April 20232023-04-06T16:25:51Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Archiving</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Archiving</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|extensions={{ext|ari}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|extensions={{ext|ari}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|released=<del class="diffchange diffchange-inline">1991?</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|released=<ins class="diffchange diffchange-inline">≤1993</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>'''ARI''' is a compressed archive utility for DOS, and associated file format, developed by RAO Inc. It was distributed as freeware, and there was a registered version with more features.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''ARI''' is a compressed archive utility for DOS, and associated file format, developed by RAO Inc. It was distributed as freeware, and there was a registered version with more features.</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>== File structure ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== File structure ==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>This information pertains to ARI and [[ERI (compressed archive)|ERI]], and is based on reverse engineering. It may be incorrect, and is likely incomplete. The software has many features whose effect on the format has not been tested.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>This information <ins class="diffchange diffchange-inline">(written for the fileformats.archiveteam.org wiki) </ins>pertains to ARI and [[ERI (compressed archive)|ERI]], and is based on reverse engineering. It may be incorrect, and is likely incomplete. The software has many features whose effect on the format has not been tested.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>An ARI or ERI file is a sequence of "member file" segments, each with the following structure:</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>An ARI or ERI file is a sequence of "member file" segments, each with the following structure:</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Software ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Software ==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">* [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=1621 Various versions of ARI at old-dos.ru]</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* {{CdTextfiles|pdos9606/ARCHIVER/TOOLS/ARI112.ZIP|ARI 1.12}} (<ins class="diffchange diffchange-inline">seems very buggy</ins>)</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* {{CdTextfiles|pdos9606/ARCHIVER/TOOLS/ARI112.ZIP|ARI 1.12}} (<del class="diffchange diffchange-inline">incomplete?/nonworking</del>)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* ARI 1.13u: [https://archive.org/details/Simtel_MSDOS_1996-09 Simtel MSDOS 1996-09] → Simtel-MSDOS-Sep1996-CD2.iso → DISC2/ARCERS/ARI113U.ZIP</ins></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI113V.ZIP ARI 1.<del class="diffchange diffchange-inline">13V</del>]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI113V.ZIP ARI 1.<ins class="diffchange diffchange-inline">13v</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">** Another copy: [https://archive.org/details/CHIP1996OktoberCD08 CHIP 1996. október (CD 08)] → CHIP_CD08.{BIN,CUE} → sac/pack/ari113v.zip</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.dcee.net/Files/Archiver/ari114.com ARI 1.14]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.dcee.net/Files/Archiver/ari114.com ARI 1.14]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI114C.ZIP ARI 1.<del class="diffchange diffchange-inline">14C</del>]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI114C.ZIP ARI 1.<ins class="diffchange diffchange-inline">14c and 1.13w</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">** Another copy: [https://archive.org/details/dptoolclub-cdasc DP Tool Club CD ASC #03, 08, 31-34] → CDASC_33_1996_novembre.iso → DOS/TOOLS/ARI114C.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 class="diffchange diffchange-inline">* {{CdTextfiles|simtel/simtel9703/disk2/DISC2/ARCERS/ARI214.COM|ARI 2.14}}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARI215.EXE|ARI 2.15}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARI215.EXE|ARI 2.15}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/simtel0101/simtel/arcers/ari22.exe|ARI 2.2}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{CdTextfiles|simtel/simtel0101/simtel/arcers/ari22.exe|ARI 2.2}}</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=1621 Various versions of ARI at old-dos.ru]</ins></div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARI_(compressed_archive)&diff=40072&oldid=prevJsummers: /* File structure */2021-06-18T15:43:33Z<p><span dir="auto"><span class="autocomment">File structure</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== File structure ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== File structure ==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>(<del class="diffchange diffchange-inline">Based </del>on <del class="diffchange diffchange-inline">educated guesswork</del>.<del class="diffchange diffchange-inline">) </del>An ARI file is a sequence of "member file" segments<del class="diffchange diffchange-inline">. In simplest form</del>, each <del class="diffchange diffchange-inline">segment starts with 28-byte header that starts </del>with <del class="diffchange diffchange-inline">11 </del>bytes for the <del class="diffchange diffchange-inline">space</del>-<del class="diffchange diffchange-inline">padded "</del>8<del class="diffchange diffchange-inline">.3" filename. However</del>, <del class="diffchange diffchange-inline">if a directory path is stored</del>, <del class="diffchange diffchange-inline">it precedes the filename</del>, and <del class="diffchange diffchange-inline">it's not obvious how its size is determined. The software has many </del>other <del class="diffchange diffchange-inline">features whose effect on the format has not been tested</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">This information pertains to ARI and [[ERI </ins>(<ins class="diffchange diffchange-inline">compressed archive)|ERI]], and is based </ins>on <ins class="diffchange diffchange-inline">reverse engineering</ins>. <ins class="diffchange diffchange-inline">It may be incorrect, and is likely incomplete. The software has many features whose effect on the format has not been tested.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>An ARI <ins class="diffchange diffchange-inline">or ERI </ins>file is a sequence of "member file" segments, each with <ins class="diffchange diffchange-inline">the following structure:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </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">{| class="wikitable"</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">! Size in </ins>bytes <ins class="diffchange diffchange-inline">!! Name !! Description and remarks</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">| path_len || filename_path || Variable size, often absent. The logic </ins>for <ins class="diffchange diffchange-inline">finding </ins>the <ins class="diffchange diffchange-inline">size is unclear.</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">| </ins>8 <ins class="diffchange diffchange-inline">|| filename_base || Filename</ins>, <ins class="diffchange diffchange-inline">base part</ins>, <ins class="diffchange diffchange-inline">padded with spaces or NUL bytes</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">| 3 || filename_ext || Filename extension</ins>, <ins class="diffchange diffchange-inline">padded</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">| 1 || || [[DOS/Windows file attributes|File attributes]] </ins>and other <ins class="diffchange diffchange-inline">flags</ins>. <ins class="diffchange diffchange-inline">0x80 bit may be set when filename_path is present.</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">| 2 || timestamp_time ||rowspan="2"| [[MS-DOS date/time|DOS time/date]]</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">| 2 || timestamp_date</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">| 4 || || Original file size</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">| 4 || member_size || Total size of this member (header + cdata)</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">| 4 || || [[CRC-32]], unknown algorithm</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">| member_size−(path_len+28) || cdata || Compressed file data</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 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>== Related formats ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr>
</table>Jsummershttp://fileformats.archiveteam.org/index.php?title=ARI_(compressed_archive)&diff=39868&oldid=prevJsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|ari}} |released=1991? }} '''ARI''' is a compressed archive utility for DOS, and associated file format,..."2021-05-21T16:51:33Z<p>Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|ari}} |released=1991? }} '''ARI''' is a compressed archive utility for DOS, and associated file format,..."</p>
<p><b>New page</b></p><div>{{FormatInfo<br />
|formattype=electronic<br />
|subcat=Archiving<br />
|extensions={{ext|ari}}<br />
|released=1991?<br />
}}<br />
'''ARI''' is a compressed archive utility for DOS, and associated file format, developed by RAO Inc. It was distributed as freeware, and there was a registered version with more features.<br />
<br />
== File structure ==<br />
(Based on educated guesswork.) An ARI file is a sequence of "member file" segments. In simplest form, each segment starts with 28-byte header that starts with 11 bytes for the space-padded "8.3" filename. However, if a directory path is stored, it precedes the filename, and it's not obvious how its size is determined. The software has many other features whose effect on the format has not been tested.<br />
<br />
== Related formats ==<br />
* [[ERI (compressed archive)]] - successor?<br />
<br />
== Software ==<br />
* [http://old-dos.ru/index.php?page=files&mode=files&do=show&id=1621 Various versions of ARI at old-dos.ru]<br />
* {{CdTextfiles|pdos9606/ARCHIVER/TOOLS/ARI112.ZIP|ARI 1.12}} (incomplete?/nonworking)<br />
* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI113V.ZIP ARI 1.13V]<br />
* [http://www.dcee.net/Files/Archiver/ari114.com ARI 1.14]<br />
* [http://mpolibbs.steptail.com/software/DOS/COMPRESS/ARI114C.ZIP ARI 1.14C]<br />
* {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARI215.EXE|ARI 2.15}}<br />
* {{CdTextfiles|simtel/simtel0101/simtel/arcers/ari22.exe|ARI 2.2}}</div>Jsummers