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<title>libaaruformat: include/aaruformat/structs/ddt.h File Reference</title>
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<div id="projectname">libaaruformat<span id="projectnumber"> 1.0</span>
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<div id="projectbrief">Aaru Data Preservation Suite - Format Library</div>
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<div class="header">
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<div class="headertitle"><div class="title">ddt.h File Reference</div></div>
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</div><!--header-->
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<div class="contents">
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<p>On-disk headers for Deduplication Data Tables (DDT) versions 1 and 2.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <stdint.h></code><br />
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</div>
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<p><a href="ddt_8h_source.html">Go to the source code of this file.</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-nested-classes" class="groupheader"><a id="nested-classes" name="nested-classes"></a>
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Data Structures</h2></td></tr>
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<tr class="memitem:DdtHeader" id="r_DdtHeader"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structDdtHeader.html">DdtHeader</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Header preceding a version 1 (flat) deduplication table body. <a href="structDdtHeader.html#details">More...</a><br /></td></tr>
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<tr class="memitem:DdtHeader2" id="r_DdtHeader2"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structDdtHeader2.html">DdtHeader2</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Header preceding a version 2 hierarchical deduplication table. <a href="structDdtHeader2.html#details">More...</a><br /></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-typedef-members" class="groupheader"><a id="typedef-members" name="typedef-members"></a>
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Typedefs</h2></td></tr>
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<tr class="memitem:afff1df7553a3d0b0d2dc67e9dc4e9804" id="r_afff1df7553a3d0b0d2dc67e9dc4e9804"><td class="memItemLeft" align="right" valign="top">typedef struct DdtHeader </td><td class="memItemRight" valign="bottom"><a class="el" href="#afff1df7553a3d0b0d2dc67e9dc4e9804">DdtHeader</a></td></tr>
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<tr class="memitem:ada1601ea9270f242a8af1d9808819a0a" id="r_ada1601ea9270f242a8af1d9808819a0a"><td class="memItemLeft" align="right" valign="top">typedef struct DdtHeader2 </td><td class="memItemRight" valign="bottom"><a class="el" href="#ada1601ea9270f242a8af1d9808819a0a">DdtHeader2</a></td></tr>
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</table>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>On-disk headers for Deduplication Data Tables (DDT) versions 1 and 2. </p>
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<p>A DDT maps logical sector indices (LBAs within an image's logical address space) to (block, sector) pairs plus a base file offset, enabling content de-duplication inside the container. Two generations exist:</p><ul>
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<li><a class="el" href="structDdtHeader.html" title="Header preceding a version 1 (flat) deduplication table body.">DdtHeader</a> ("version 1") flat table.</li>
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<li><a class="el" href="structDdtHeader2.html" title="Header preceding a version 2 hierarchical deduplication table.">DdtHeader2</a> ("version 2") hierarchical, multi-level subtables for scalability.</li>
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</ul>
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<p>All integers are little-endian. Structures are packed (1-byte alignment). When porting to a big-endian architecture callers must perform byte swapping. Do not rely on compiler-introduced padding.</p>
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<p>Compression of the table body (entries array) follows the same conventions as data blocks: first decompress according to the compression enum, then validate CRC64 for uncompressed contents.</p>
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<p>Related enumerations:</p><ul>
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<li>BlockType::DeDuplicationTable / BlockType::DeDuplicationTable2</li>
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<li><a class="el" href="enums_8h.html#affec749ed88365143745313ae9168263" title="List of known compression types.">CompressionType</a></li>
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<li><a class="el" href="enums_8h.html#ad8ed01ff3ff33333d8e19db4d2818bb6" title="List of known data types stored within an Aaru image.">DataType</a></li>
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<li>DdtSizeType (for DdtHeader2::sizeType) </li>
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</ul>
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<p class="definition">Definition in file <a class="el" href="ddt_8h_source.html">ddt.h</a>.</p>
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</div><a name="doc-typedef-members" id="doc-typedef-members"></a><h2 id="header-doc-typedef-members" class="groupheader">Typedef Documentation</h2>
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<a id="afff1df7553a3d0b0d2dc67e9dc4e9804" name="afff1df7553a3d0b0d2dc67e9dc4e9804"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#afff1df7553a3d0b0d2dc67e9dc4e9804">◆ </a></span>DdtHeader</h2>
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<td class="memname">typedef struct DdtHeader DdtHeader</td>
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<a id="ada1601ea9270f242a8af1d9808819a0a" name="ada1601ea9270f242a8af1d9808819a0a"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ada1601ea9270f242a8af1d9808819a0a">◆ </a></span>DdtHeader2</h2>
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<td class="memname">typedef struct DdtHeader2 DdtHeader2</td>
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<li class="navelem"><a href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a href="dir_aeff2545c9dfcfc842fe9d84b123cb31.html">aaruformat</a></li><li class="navelem"><a href="dir_6387aeb6e475a334d8dc12d69f21999e.html">structs</a></li><li class="navelem"><a href="ddt_8h.html">ddt.h</a></li>
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<li class="footer">Generated by <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.14.0 </li>
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