http://fileformats.archiveteam.org/index.php?title=IPS_(binary_patch_format)&feed=atom&action=historyIPS (binary patch format) - Revision history2024-03-29T12:54:36ZRevision history for this page on the wikiMediaWiki 1.19.2http://fileformats.archiveteam.org/index.php?title=IPS_(binary_patch_format)&diff=22628&oldid=prevFelix at 09:57, 1 June 20152015-06-01T09:57:38Z<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|ips}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>  | extensions = {{ext|ips}}</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;"> | released = ≤ 1993</ins></div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''IPS''' is a simple format for binary file patches.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''IPS''' is a simple format for binary file patches<ins class="diffchange diffchange-inline">, popular in the ROM hacking community. "IPS" allegedly stands for "International Patching System". The original author of the format is unknown.</ins></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 class="diffchange diffchange-inline">== 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><ins class="diffchange diffchange-inline">An IPS file starts with the magic number {{magic|"PATCH"}} (<code>50 41 54 43 48</code>), followed by a series of hunks and an end-of-file marker {{magic|"EOF"}} (<code>45 4f 46</code>). All numerical values are unsigned and stored big-endian.</ins></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 class="diffchange diffchange-inline">Regular hunks consist of a three-byte offset followed by a two-byte length of the payload and the payload itself. Applying the hunk is done by writing the payload at the specified offset.</ins></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 class="diffchange diffchange-inline">RLE hunks have their length field set to zero; in place of a payload there is a two-byte length of the run followed by a single byte indicating the value to be written. Applying the RLE hunk is done by writing this byte the specified number of times at the specified offset.</ins></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 class="diffchange diffchange-inline">As an extension, the end-of-file marker may be followed by a three-byte length to which the resulting file should be truncated. Not every patching program will implement this extension, however.</ins></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 class="diffchange diffchange-inline">== Limitations and pitfalls ==</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">Due to its simplicity, the IPS format suffers from a number of problems:</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">* Programs generating IPS files should avoid generating hunks with offset 0x454f46, as the byte encoding of this offset may be misinterpreted as the end-of-file marker. (One way to do it is to generate them with offset 0x454f45 and include the preceding byte.)</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">* IPS patches are not reversible, unlike e.g. [[unified diff]]s: one cannot recover an unpatched binary from a patch file and a patched binary.</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">* There are no integrity checks built into the IPS format. The responsibility to ensure that the patch is not corrupted, that the correct file is patched, and that the result of patching is valid falls upon the user.</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">* The IPS format is next to impossible to extend in a backwards-compatible way; extending the format risks introducing misinterpretations which are often not even detectable by the patching software (given the above).</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">* IPS patches cannot affect bytes beyond offset 16842750 (0x100fffe = 0xffffff + 0xffff); the IPS patch format may be therefore inadequate for files larger than 16 MiB</ins>.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== External links ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== External links ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://romhack.wikia.com/wiki/IPS Format description at ROM Hack City]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://romhack.wikia.com/wiki/IPS Format description at ROM Hack City]</div></td></tr>
</table>Felixhttp://fileformats.archiveteam.org/index.php?title=IPS_(binary_patch_format)&diff=22562&oldid=prevDan Tobias at 23:14, 17 May 20152015-05-17T23:14:18Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</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;"> | subcat = Archiving</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>  | extensions = {{ext|ips}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>  | extensions = {{ext|ips}}</div></td></tr>
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</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IPS_(binary_patch_format)&diff=22550&oldid=prevFelix: new2015-05-17T22:04:27Z<p>new</p>
<p><b>New page</b></p><div>{{FormatInfo<br />
| extensions = {{ext|ips}}<br />
}}<br />
'''IPS''' is a simple format for binary file patches.<br />
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== External links ==<br />
* [http://romhack.wikia.com/wiki/IPS Format description at ROM Hack City]</div>Felix