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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">index.h File Reference</div></div>
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<p>On‑disk index block header and entry structures (versions 1, 2 and 3).
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<a href="#details">More...</a></p>
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<p><a href="index_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:IndexHeader" id="r_IndexHeader"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structIndexHeader.html">IndexHeader</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Index header (version 1) for legacy images (identifier == IndexBlock). <a href="structIndexHeader.html#details">More...</a><br /></td></tr>
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<tr class="memitem:IndexHeader2" id="r_IndexHeader2"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structIndexHeader2.html">IndexHeader2</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2). <a href="structIndexHeader2.html#details">More...</a><br /></td></tr>
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<tr class="memitem:IndexHeader3" id="r_IndexHeader3"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structIndexHeader3.html">IndexHeader3</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Index header (version 3) adding hierarchical chaining (identifier == IndexBlock3). <a href="structIndexHeader3.html#details">More...</a><br /></td></tr>
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<tr class="memitem:IndexEntry" id="r_IndexEntry"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structIndexEntry.html">IndexEntry</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Single index entry describing a block's type, (optional) data classification, and file offset. <a href="structIndexEntry.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:af68e20e1f9ee3ea029ed4f69ea82c32f" id="r_af68e20e1f9ee3ea029ed4f69ea82c32f"><td class="memItemLeft" align="right" valign="top">typedef struct IndexHeader </td><td class="memItemRight" valign="bottom"><a class="el" href="#af68e20e1f9ee3ea029ed4f69ea82c32f">IndexHeader</a></td></tr>
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<tr class="memitem:a5f7e5a06dff1100016015c4809277d2a" id="r_a5f7e5a06dff1100016015c4809277d2a"><td class="memItemLeft" align="right" valign="top">typedef struct IndexHeader2 </td><td class="memItemRight" valign="bottom"><a class="el" href="#a5f7e5a06dff1100016015c4809277d2a">IndexHeader2</a></td></tr>
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<tr class="memitem:acae06d4f1500d591e6d86b9d52d29a84" id="r_acae06d4f1500d591e6d86b9d52d29a84"><td class="memItemLeft" align="right" valign="top">typedef struct IndexHeader3 </td><td class="memItemRight" valign="bottom"><a class="el" href="#acae06d4f1500d591e6d86b9d52d29a84">IndexHeader3</a></td></tr>
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<tr class="memitem:a12d666b4c91b2de9ba60887f0783e98d" id="r_a12d666b4c91b2de9ba60887f0783e98d"><td class="memItemLeft" align="right" valign="top">typedef struct IndexEntry </td><td class="memItemRight" valign="bottom"><a class="el" href="#a12d666b4c91b2de9ba60887f0783e98d">IndexEntry</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 index block header and entry structures (versions 1, 2 and 3). </p>
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<p>The index provides a directory of all blocks contained in an Aaru image. Each index block starts with a versioned header (<a class="el" href="structIndexHeader.html" title="Index header (version 1) for legacy images (identifier == IndexBlock).">IndexHeader</a> / <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a> / <a class="el" href="structIndexHeader3.html" title="Index header (version 3) adding hierarchical chaining (identifier == IndexBlock3).">IndexHeader3</a>) followed by a contiguous array of fixed‑size <a class="el" href="structIndexEntry.html">IndexEntry</a> records. Version 3 adds support for hierarchical (chained / nested) subindexes.</p>
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<p>Version mapping by block identifier (see <a class="el" href="enums_8h.html#a54420623f26ab6bb61042b41cccf37a3">BlockType</a>):</p><ul>
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<li>IndexBlock (v1) -> <a class="el" href="structIndexHeader.html">IndexHeader</a> followed by 16‑bit entry count entries.</li>
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<li>IndexBlock2 (v2) -> <a class="el" href="structIndexHeader2.html">IndexHeader2</a> followed by 64‑bit entry count entries.</li>
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<li>IndexBlock3 (v3) -> <a class="el" href="structIndexHeader3.html">IndexHeader3</a> with optional hierarchical subindex references.</li>
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</ul>
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<p>CRC coverage & endianness:</p><ul>
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<li>The crc64 field stores a CRC64-ECMA over the entries array ONLY (header bytes are excluded).</li>
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<li>For images with imageMajorVersion <= AARUF_VERSION_V1 a legacy writer byte-swapped the CRC; readers compensate (see verify_index_v1/v2/v3). The value in the header remains whatever was originally written.</li>
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</ul>
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<p>Hierarchical (v3) behavior:</p><ul>
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<li>Entries whose blockType == IndexBlock3 refer to subindex blocks; readers recursively load and flatten.</li>
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<li><a class="el" href="structIndexHeader3.html#a33743c206cb10cc1d8ff2c7f9e61ddcf" title="File offset of a previous IndexBlock3 header (0 if none / root segment).">IndexHeader3::previous</a> can point to a preceding index segment (for append / incremental scenarios) or 0.</li>
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<li>CRC of the main index does NOT cover subindex contents; each subindex has its own header + CRC.</li>
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</ul>
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<p>Invariants / validation recommendations:</p><ul>
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<li>identifier must equal the expected <a class="el" href="enums_8h.html#a54420623f26ab6bb61042b41cccf37a3" title="List of known block types contained in an Aaru image.">BlockType</a> variant for that version.</li>
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<li>entries > 0 implies the entries array byte size == entries * sizeof(IndexEntry).</li>
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<li>crc64 must match recomputed CRC64( entries array ) (after legacy byte swap handling if required).</li>
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<li>For v3, if previous != 0 it should point to another IndexBlock3 header (optional best‑effort check).</li>
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</ul>
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<p>Notes:</p><ul>
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<li>Structures are packed (1‑byte alignment). All multi-byte integers are little‑endian on disk.</li>
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<li>The index does not store per-entry CRC; integrity relies on each individual block's own CRC plus the index CRC.</li>
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<li>dataType in <a class="el" href="structIndexEntry.html">IndexEntry</a> is meaningful only for block types that carry typed data (e.g. DataBlock, DumpHardwareBlock, etc.).</li>
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</ul>
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<p>See also: <a class="el" href="internal_8h.html#a89ed93d216c4dce0ae5e2acccf8cc2b4" title="Verifies the integrity of an index block (version 1) in the image stream.">verify_index_v1()</a>, <a class="el" href="internal_8h.html#ae234e22b16b085d18614110630034db5" title="Verifies the integrity of an index block (version 2) in the image stream.">verify_index_v2()</a>, <a class="el" href="internal_8h.html#ad7ed9250463c320c7bc8d83689bcfefb" title="Verifies the integrity of an index block (version 3) in the image stream.">verify_index_v3()</a> for integrity procedures. </p>
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<p class="definition">Definition in file <a class="el" href="index_8h_source.html">index.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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<h2 class="memtitle"><span class="permalink"><a href="#a12d666b4c91b2de9ba60887f0783e98d">◆ </a></span>IndexEntry</h2>
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<td class="memname">typedef struct IndexEntry IndexEntry</td>
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<h2 class="memtitle"><span class="permalink"><a href="#af68e20e1f9ee3ea029ed4f69ea82c32f">◆ </a></span>IndexHeader</h2>
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<td class="memname">typedef struct IndexHeader IndexHeader</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a5f7e5a06dff1100016015c4809277d2a">◆ </a></span>IndexHeader2</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#acae06d4f1500d591e6d86b9d52d29a84">◆ </a></span>IndexHeader3</h2>
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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="index_8h.html">index.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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