http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=Lead_Technologies_archiveLead Technologies archive - Revision history2026-04-17T21:27:54ZRevision history for this page on the wikiMediaWiki 1.19.2http://fileformats.archiveteam.org/index.php?title=Lead_Technologies_archive&diff=51162&oldid=prevRSola: Added archive structure and compression details, moved Identification to the top2025-11-03T09:10:10Z<p>Added archive structure and compression details, moved Identification to the top</p>
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<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1994?</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1994?</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>'''Lead Technologies archive''' (official name unknown) is a compressed installer-archive format used in some Lead Technologies software. The file is usually named "SETUP.LTA".</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''Lead Technologies archive''' (official name unknown) is a compressed installer-archive format used in some Lead Technologies software. The file is usually named "SETUP.LTA<ins class="diffchange diffchange-inline">". Multi-part archives are common, with multiple "SETUP.LTA" files comprising a single archive. A byte in the archive header reflects the volume number.</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">Software using LTA usually includes an LTEXPAND.DLL file, which presumably contains decompression library code.</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">== Identification ==</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">File start with ASCII "{{magic|LTEC}}</ins>".</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Format details ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Format details ==</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;">Multi-part archives are common, with multiple "SETUP.LTA" files comprising a single archive. The byte at offset 4 reflects the volume number.</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: #ffa; color:black; font-size: smaller;"><div>The compression method <del class="diffchange diffchange-inline">is unknown</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The format consists of an archive header and a sequence of member file headers, terminated by two null bytes, then followed by one or more compressed data blocks. A form of solid archiving is used: individual files are not packed separately, but concatenated and then compressed as a whole. Each compressed block contains a different set of files in the archive. </ins>The compression method <ins class="diffchange diffchange-inline">seems to match [[LHA|LHA's lhx]] as implemented by [https://github.com/fragglet/lhasa Lhasa]</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: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Software using LTA usually includes an LTEXPAND.DLL file, which presumably contains decompression library code</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Byte order is [[Endianness|little-endian]]</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: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Technical note: The format is not as simple as it may look at first. It does not evidently contain the offsets, or sizes, of the compressed form of the member files. (Possibly uses "solid" archiving?)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">=== Archive header ===</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: #ffa; color:black; font-size: smaller;"><div>=<del class="diffchange diffchange-inline">= Identification ==</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">{| class</ins>="<ins class="diffchange diffchange-inline">wikitable"</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">File start with ASCII </del>"{{magic|<del class="diffchange diffchange-inline">LTEC</del>}}".</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Field offset</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</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">! Description</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">| 0  || 4 bytes || Signature </ins>{{magic|<ins class="diffchange diffchange-inline">4c 54 45 43</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">| 4  || 1 byte  || Volume number</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">| 5  || 4 bytes || Start of the first compressed block</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> </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 start of the first compressed block should equal the sum of the sizes of the archive header, all of the member file headers, and the two terminating null bytes.</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">=== Member file header ===</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=</ins>"<ins class="diffchange diffchange-inline">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">! Field offset</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</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">! Description</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">| 0  || 2 bytes  || Length of the header (including this field)</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  || 4 bytes  || Start of the compressed stream the file is included in, relative to the third field in the archive header (i.e., files in the first compressed block have this field set to zero)</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">| 6  || 4 bytes  || Start of the file contents in the corresponding uncompressed block</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">| 10 || 4 bytes  || Size of the file contents in the corresponding uncompressed block</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">| 14 || variable || Null-terminated file name</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> </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 sequence of member file headers is terminated by a two-byte header with just a length field equal to zero</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>
<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 class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{DiscMasterLink|search?detection&#x3d;4c544543*&amp;showItemName&#x3d;showItemName|DiscMaster search}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* {{DiscMasterLink|search?detection&#x3d;4c544543*&amp;showItemName&#x3d;showItemName|DiscMaster search}}</div></td></tr>
</table>RSolahttp://fileformats.archiveteam.org/index.php?title=Lead_Technologies_archive&diff=51140&oldid=prevJsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|lta}} |released=1994? }} '''Lead Technologies archive''' (official name unknown) is a compressed instal..."2025-10-12T16:03:03Z<p>Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|lta}} |released=1994? }} '''Lead Technologies archive''' (official name unknown) is a compressed instal..."</p>
<p><b>New page</b></p><div>{{FormatInfo<br />
|formattype=electronic<br />
|subcat=Archiving<br />
|extensions={{ext|lta}}<br />
|released=1994?<br />
}}<br />
'''Lead Technologies archive''' (official name unknown) is a compressed installer-archive format used in some Lead Technologies software. The file is usually named "SETUP.LTA".<br />
<br />
== Format details ==<br />
Multi-part archives are common, with multiple "SETUP.LTA" files comprising a single archive. The byte at offset 4 reflects the volume number.<br />
<br />
The compression method is unknown.<br />
<br />
Software using LTA usually includes an LTEXPAND.DLL file, which presumably contains decompression library code.<br />
<br />
Technical note: The format is not as simple as it may look at first. It does not evidently contain the offsets, or sizes, of the compressed form of the member files. (Possibly uses "solid" archiving?)<br />
<br />
== Identification ==<br />
File start with ASCII "{{magic|LTEC}}".<br />
<br />
== Sample files ==<br />
* {{DiscMasterLink|search?detection&#x3d;4c544543*&amp;showItemName&#x3d;showItemName|DiscMaster search}}</div>Jsummers