http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=PPMd 2026-04-23T03:49:26Z Revision history for this page on the wiki MediaWiki 1.19.2 http://fileformats.archiveteam.org/index.php?title=PPMd&diff=36348&oldid=prev 2020-07-22T19:51:57Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <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 19:51, 22 July 2020</td> </tr><tr><td colspan="2" class="diff-lineno">Line 9:</td> <td colspan="2" class="diff-lineno">Line 9:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>It was originally named '''PPMD''' (PPM, escape method D), later '''PPMd''' (PPM by Dmitry).</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>It was originally named '''PPMD''' (PPM, escape method D), later '''PPMd''' (PPM by Dmitry).</div></td></tr> <tr><td colspan="2">&#160;</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">&#160;</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;">== Identification ==</ins></div></td></tr> <tr><td colspan="2">&#160;</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;">PPMd files start with signature bytes {{magic|8f af ac 84}}.</ins></div></td></tr> <tr><td colspan="2">&#160;</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">&#160;</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 reversed signature {{magic|84 ac af 8f}} may also be possible, if the software is compiled for a big-endian system.</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=PPMd&diff=36346&oldid=prev 2020-07-22T19:48:29Z

<p>Pretty much a rewrite</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 19:48, 22 July 2020</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|subcat=<del class="diffchange diffchange-inline">Compression</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|subcat=<ins class="diffchange diffchange-inline">Archiving</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|extensions={{ext|pmd}}</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|wikidata={{wikidata|Q3359811}}</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|released=1999</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'>&#160;</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>'''PPMd''' <del class="diffchange diffchange-inline">(or '''PPMD''') </del>is a data <del class="diffchange diffchange-inline">compression scheme best suited </del>to <del class="diffchange diffchange-inline">compression </del>of <del class="diffchange diffchange-inline">text files</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''PPMd''' is a <ins class="diffchange diffchange-inline">compressed archive format developed by Dmitry Shkarin, and various compressed </ins>data <ins class="diffchange diffchange-inline">formats derived from it. It uses [[Prediction by partial matching]]. It's intended </ins>to <ins class="diffchange diffchange-inline">be used mainly by other software, instead </ins>of <ins class="diffchange diffchange-inline">directly by end users</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</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><del class="diffchange diffchange-inline">&quot;</del>PPM<del class="diffchange diffchange-inline">&quot; refers to the &quot;[[Prediction by partial matching]]&quot; class of compression algorithms</del>, <del class="diffchange diffchange-inline">and the &quot;d&quot; is an arbitrary identifier for the specific algorithm</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">It was originally named '''PPMD''' (</ins>PPM, <ins class="diffchange diffchange-inline">escape method D), later '''PPMd''' (PPM by Dmitry)</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [[7z]] <del class="diffchange diffchange-inline">format supports </del>PPMd.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [[7z]] <ins class="diffchange diffchange-inline">- Has a </ins>PPMd <ins class="diffchange diffchange-inline">compression method</ins>.</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [[Zipx]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [[Zipx]] <ins class="diffchange diffchange-inline">- Has a PPMd compression method.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* [[BMF (Dmitry Shkarin)]] - Same author</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</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>== <del class="diffchange diffchange-inline">Links </del>==</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>== <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">Wikipedia:Prediction by partial matching|Wikipedia</del>: <del class="diffchange diffchange-inline">Prediction by partial matching</del>]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* http://compression.ru/ds/ → &quot;PPMd&quot; ... - Source code + Windows console binaries (web page in Russian, software in English)</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [[<ins class="diffchange diffchange-inline">The Unarchiver]]</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&#160;</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[Category</ins>:<ins class="diffchange diffchange-inline">Compression</ins>]]</div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=PPMd&diff=35992&oldid=prev 2020-06-18T19:04:30Z

<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 19:04, 18 June 2020</td> </tr><tr><td colspan="2" class="diff-lineno">Line 5:</td> <td colspan="2" class="diff-lineno">Line 5:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>'''PPMd''' (or '''PPMD''') is a data compression scheme best suited to compression of text files.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>'''PPMd''' (or '''PPMD''') is a data compression scheme best suited to compression of text files.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</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>&quot;PPM&quot; refers to the &quot;Prediction by <del class="diffchange diffchange-inline">Partial Matching</del>&quot; class of compression algorithms, and the &quot;d&quot; is an arbitrary identifier for the specific algorithm.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&quot;PPM&quot; refers to the &quot;<ins class="diffchange diffchange-inline">[[</ins>Prediction by <ins class="diffchange diffchange-inline">partial matching]]</ins>&quot; class of compression algorithms, and the &quot;d&quot; is an arbitrary identifier for the specific algorithm.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=PPMd&diff=20084&oldid=prev 2014-12-14T19:48:11Z

<p>‎<span dir="auto"><span class="autocomment">Related formats</span></span></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 19:48, 14 December 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 9:</td> <td colspan="2" class="diff-lineno">Line 9:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Related formats ==</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[7z]] format supports PPMd.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[7z]] format supports PPMd.</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [[<del class="diffchange diffchange-inline">ZIP</del>]] <del class="diffchange diffchange-inline">format supports PPMd (compression code 98), though application support for it is limited.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [[<ins class="diffchange diffchange-inline">Zipx</ins>]]</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Prediction by partial matching|Wikipedia: Prediction by partial matching]]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Prediction by partial matching|Wikipedia: Prediction by partial matching]]</div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=PPMd&diff=16702&oldid=prev 2014-03-23T15:08:52Z

<p>Created page with &quot;{{FormatInfo |formattype=electronic |subcat=Compression }} &#039;&#039;&#039;PPMd&#039;&#039;&#039; (or &#039;&#039;&#039;PPMD&#039;&#039;&#039;) is a data compression scheme best suited to compression of text files. &quot;PPM&quot; refers to t...&quot;</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |formattype=electronic<br /> |subcat=Compression<br /> }}<br /> '''PPMd''' (or '''PPMD''') is a data compression scheme best suited to compression of text files.<br /> <br /> &quot;PPM&quot; refers to the &quot;Prediction by Partial Matching&quot; class of compression algorithms, and the &quot;d&quot; is an arbitrary identifier for the specific algorithm.<br /> <br /> == Related formats ==<br /> * [[7z]] format supports PPMd.<br /> * [[ZIP]] format supports PPMd (compression code 98), though application support for it is limited.<br /> <br /> == Links ==<br /> * [[Wikipedia:Prediction by partial matching|Wikipedia: Prediction by partial matching]]</div>

Jsummers