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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="headertitle"><div class="title">index_v2.c File Reference</div></div>
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</div><!--header-->
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<div class="textblock"><code>#include <limits.h></code><br />
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<code>#include <stdint.h></code><br />
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<code>#include <stdio.h></code><br />
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<code>#include <stdlib.h></code><br />
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<code>#include "<a class="el" href="aaruformat_8h_source.html">aaruformat.h</a>"</code><br />
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<code>#include "<a class="el" href="log_8h_source.html">log.h</a>"</code><br />
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<code>#include "utarray.h"</code><br />
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</div>
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<p><a href="index__v2_8c_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-func-members" class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a1baad6508d1cde5a712794e956fb3d3c" id="r_a1baad6508d1cde5a712794e956fb3d3c"><td class="memItemLeft" align="right" valign="top">UT_array * </td><td class="memItemRight" valign="bottom"><a class="el" href="#a1baad6508d1cde5a712794e956fb3d3c">process_index_v2</a> (<a class="el" href="structaaruformat__context.html">aaruformat_context</a> *ctx)</td></tr>
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<tr class="memdesc:a1baad6508d1cde5a712794e956fb3d3c"><td class="mdescLeft"> </td><td class="mdescRight">Processes an index block (version 2) from the image stream. <br /></td></tr>
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<tr class="memitem:ae234e22b16b085d18614110630034db5" id="r_ae234e22b16b085d18614110630034db5"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#ae234e22b16b085d18614110630034db5">verify_index_v2</a> (<a class="el" href="structaaruformat__context.html">aaruformat_context</a> *ctx)</td></tr>
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<tr class="memdesc:ae234e22b16b085d18614110630034db5"><td class="mdescLeft"> </td><td class="mdescRight">Verifies the integrity of an index block (version 2) in the image stream. <br /></td></tr>
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</table>
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<a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Function Documentation</h2>
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<a id="a1baad6508d1cde5a712794e956fb3d3c" name="a1baad6508d1cde5a712794e956fb3d3c"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a1baad6508d1cde5a712794e956fb3d3c">◆ </a></span>process_index_v2()</h2>
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<table class="memname">
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<td class="memname">UT_array * process_index_v2 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structaaruformat__context.html">aaruformat_context</a> *</td> <td class="paramname"><span class="paramname"><em>ctx</em></span></td><td>)</td>
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<td></td>
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</div><div class="memdoc">
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<p>Processes an index block (version 2) from the image stream. </p>
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<p>Reads and parses an index block (version 2) from the image, returning an array of index entries. This function handles the intermediate index format used in mid-generation AaruFormat versions, providing compatibility with version 2 image files. It reads the <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a> structure followed by a sequential list of <a class="el" href="structIndexEntry.html" title="Single index entry describing a block's type, (optional) data classification, and file offset.">IndexEntry</a> structures, validating the index identifier for format correctness.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ctx</td><td>Pointer to the aaruformat context containing the image stream and header information.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Returns one of the following values: </dd></dl>
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<dl class="retval"><dt>Return values</dt><dd>
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<table class="retval">
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<tr><td class="paramname">UT_array*</td><td>Successfully processed the index block. This is returned when:<ul>
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<li>The context and image stream are valid</li>
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<li>The index header is successfully read from the position specified in ctx->header.indexOffset</li>
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<li>The index identifier matches IndexBlock2 (version 2 format identifier)</li>
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<li>All index entries are successfully read and stored in the UT_array</li>
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<li>Memory allocation for the index entries array succeeds</li>
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<li>The returned array contains all index entries from the version 2 index block</li>
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</ul>
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</td></tr>
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<tr><td class="paramname">NULL</td><td>Index processing failed. This occurs when:<ul>
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<li>The context parameter is NULL</li>
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<li>The image stream (ctx->imageStream) is NULL or invalid</li>
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<li>Cannot read the <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a> structure from the image stream</li>
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<li>The index identifier doesn't match IndexBlock2 (incorrect format or corruption)</li>
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<li>Memory allocation fails for the UT_array structure</li>
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<li>File I/O errors occur while reading index entries</li>
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</ul>
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</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section note"><dt>Note</dt><dd>Index Structure (Version 2):<ul>
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<li><a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a>: Contains identifier (IndexBlock2), entry count, and enhanced metadata</li>
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<li><a class="el" href="structIndexEntry.html" title="Single index entry describing a block's type, (optional) data classification, and file offset.">IndexEntry</a> array: Sequential list of entries describing block locations and types</li>
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<li>No CRC validation is performed during processing (use verify_index_v2 for validation)</li>
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<li>No compression support in version 2 index format</li>
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<li>Compatible with mid-generation AaruFormat improvements</li>
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</ul>
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</dd>
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<dd>
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Memory Management:<ul>
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<li>Returns a newly allocated UT_array that must be freed by the caller using utarray_free()</li>
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<li>On error, any partially allocated memory is cleaned up before returning NULL</li>
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<li>Each <a class="el" href="structIndexEntry.html" title="Single index entry describing a block's type, (optional) data classification, and file offset.">IndexEntry</a> is copied into the array (no reference to original stream data)</li>
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</ul>
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</dd>
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<dd>
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Version Compatibility:<ul>
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<li>Supports only IndexBlock2 format (not IndexBlock or IndexBlock3)</li>
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<li>Compatible with intermediate AaruFormat image files</li>
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<li>Does not handle subindex or hierarchical index structures (introduced in v3)</li>
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</ul>
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</dd></dl>
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<dl class="section warning"><dt>Warning</dt><dd>The caller is responsible for freeing the returned UT_array using utarray_free(). Failure to free the array will result in memory leaks.</dd>
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<dd>
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This function does not validate the CRC integrity of the index data. Use <a class="el" href="#ae234e22b16b085d18614110630034db5" title="Verifies the integrity of an index block (version 2) in the image stream.">verify_index_v2()</a> to ensure index integrity before processing.</dd>
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<dd>
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The function assumes ctx->header.indexOffset points to a valid index block. Invalid offsets may cause file access errors or reading incorrect data. </dd></dl>
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<p class="definition">Definition at line <a class="el" href="index__v2_8c_source.html#l00081">81</a> of file <a class="el" href="index__v2_8c_source.html">index_v2.c</a>.</p>
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<p class="reference">References <a class="el" href="index_8h_source.html#l00081">IndexHeader2::entries</a>, <a class="el" href="log_8h_source.html#l00040">FATAL</a>, <a class="el" href="context_8h_source.html#l00175">aaruformat_context::header</a>, <a class="el" href="index_8h_source.html#l00080">IndexHeader2::identifier</a>, <a class="el" href="context_8h_source.html#l00176">aaruformat_context::imageStream</a>, <a class="el" href="enums_8h_source.html#l00146">IndexBlock2</a>, <a class="el" href="header_8h_source.html#l00115">AaruHeaderV2::indexOffset</a>, and <a class="el" href="log_8h_source.html#l00025">TRACE</a>.</p>
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<p class="reference">Referenced by <a class="el" href="open_8c_source.html#l00125">aaruf_open()</a>, and <a class="el" href="verify_8c_source.html#l00130">aaruf_verify_image()</a>.</p>
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<a id="ae234e22b16b085d18614110630034db5" name="ae234e22b16b085d18614110630034db5"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ae234e22b16b085d18614110630034db5">◆ </a></span>verify_index_v2()</h2>
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<td class="memname">int32_t verify_index_v2 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structaaruformat__context.html">aaruformat_context</a> *</td> <td class="paramname"><span class="paramname"><em>ctx</em></span></td><td>)</td>
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<td></td>
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</div><div class="memdoc">
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<p>Verifies the integrity of an index block (version 2) in the image stream. </p>
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<p>Checks the CRC64 of the index block without decompressing it. This function performs comprehensive validation of the version 2 index structure including header validation, data integrity verification, and version-specific CRC calculation. It ensures the index block is valid and uncorrupted before the image can be safely used for data access.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">ctx</td><td>Pointer to the aaruformat context containing image stream and header information.</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Returns one of the following status codes: </dd></dl>
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<dl class="retval"><dt>Return values</dt><dd>
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<table class="retval">
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<tr><td class="paramname">AARUF_STATUS_OK</td><td>(0) Successfully verified index integrity. This is returned when:<ul>
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<li>The context and image stream are valid</li>
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<li>The index header is successfully read from ctx->header.indexOffset</li>
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<li>The index identifier matches IndexBlock2 (version 2 format)</li>
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<li>Memory allocation for index entries succeeds</li>
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<li>All index entries are successfully read from the image stream</li>
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<li>CRC64 calculation completes successfully with version-specific endianness handling</li>
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<li>The calculated CRC64 matches the expected CRC64 in the index header</li>
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</ul>
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</td></tr>
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<tr><td class="paramname">AARUF_ERROR_NOT_AARUFORMAT</td><td>(-1) Invalid context or stream. This occurs when:<ul>
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<li>The context parameter is NULL</li>
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<li>The image stream (ctx->imageStream) is NULL or invalid</li>
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</ul>
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</td></tr>
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<tr><td class="paramname">AARUF_ERROR_CANNOT_READ_HEADER</td><td>(-6) Index header reading failed. This occurs when:<ul>
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<li>Cannot read the complete <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a> structure from the image stream</li>
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<li>File I/O errors prevent accessing the header at ctx->header.indexOffset</li>
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<li>Insufficient data available at the specified index offset</li>
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</ul>
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</td></tr>
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<tr><td class="paramname">AARUF_ERROR_CANNOT_READ_INDEX</td><td>(-19) Index format or data access errors. This occurs when:<ul>
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<li>The index identifier doesn't match IndexBlock2 (wrong format or corruption)</li>
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<li>Cannot read all index entries from the image stream</li>
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<li>File I/O errors during index entry reading</li>
|
|||
|
|
<li>Index structure is corrupted or truncated</li>
|
|||
|
|
</ul>
|
|||
|
|
</td></tr>
|
|||
|
|
<tr><td class="paramname">AARUF_ERROR_NOT_ENOUGH_MEMORY</td><td>(-9) Memory allocation failed. This occurs when:<ul>
|
|||
|
|
<li>Cannot allocate memory for the index entries array</li>
|
|||
|
|
<li>System memory exhaustion prevents loading index data for verification</li>
|
|||
|
|
</ul>
|
|||
|
|
</td></tr>
|
|||
|
|
<tr><td class="paramname">AARUF_ERROR_INVALID_BLOCK_CRC</td><td>(-18) CRC64 validation failed. This occurs when:<ul>
|
|||
|
|
<li>The calculated CRC64 doesn't match the expected CRC64 in the index header</li>
|
|||
|
|
<li>Index data corruption is detected</li>
|
|||
|
|
<li>Data integrity verification fails indicating potential file damage</li>
|
|||
|
|
</ul>
|
|||
|
|
</td></tr>
|
|||
|
|
</table>
|
|||
|
|
</dd>
|
|||
|
|
</dl>
|
|||
|
|
<dl class="section note"><dt>Note</dt><dd>CRC64 Validation Process:<ul>
|
|||
|
|
<li>Reads all index entries into memory for CRC calculation</li>
|
|||
|
|
<li>Calculates CRC64 over the complete index entries array</li>
|
|||
|
|
<li>Applies version-specific endianness conversion for compatibility</li>
|
|||
|
|
<li>For imageMajorVersion <= AARUF_VERSION_V1: Uses <a class="el" href="endian_8h.html#a0c0b427a2547aa727e2c5262a174e26b">bswap_64()</a> for byte order correction</li>
|
|||
|
|
<li>Compares calculated CRC64 with the value stored in the <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</dd>
|
|||
|
|
<dd>
|
|||
|
|
Version 2 Enhancements:<ul>
|
|||
|
|
<li>Uses <a class="el" href="structIndexHeader2.html" title="Index header (version 2) with 64‑bit entry counter (identifier == IndexBlock2).">IndexHeader2</a> structure with enhanced metadata support</li>
|
|||
|
|
<li>Maintains compatibility with legacy endianness handling</li>
|
|||
|
|
<li>Supports improved index entry organization compared to version 1</li>
|
|||
|
|
</ul>
|
|||
|
|
</dd>
|
|||
|
|
<dd>
|
|||
|
|
Memory Management:<ul>
|
|||
|
|
<li>Allocates temporary memory for index entries during verification</li>
|
|||
|
|
<li>Automatically frees allocated memory on both success and error conditions</li>
|
|||
|
|
<li>Memory usage is proportional to the number of index entries</li>
|
|||
|
|
</ul>
|
|||
|
|
</dd>
|
|||
|
|
<dd>
|
|||
|
|
Verification Scope:<ul>
|
|||
|
|
<li>Validates index header structure and identifier</li>
|
|||
|
|
<li>Verifies data integrity through CRC64 calculation</li>
|
|||
|
|
<li>Does not validate individual index entry contents or block references</li>
|
|||
|
|
<li>Does not check for logical consistency of referenced blocks</li>
|
|||
|
|
</ul>
|
|||
|
|
</dd></dl>
|
|||
|
|
<dl class="section warning"><dt>Warning</dt><dd>This function reads the entire index into memory for CRC calculation. Large indexes may require significant memory allocation.</dd>
|
|||
|
|
<dd>
|
|||
|
|
The function assumes ctx->header.indexOffset points to a valid index location. Invalid offsets will cause file access errors or incorrect validation.</dd>
|
|||
|
|
<dd>
|
|||
|
|
CRC validation failure indicates potential data corruption and may suggest the image file is damaged or has been modified outside of library control. </dd></dl>
|
|||
|
|
|
|||
|
|
<p class="definition">Definition at line <a class="el" href="index__v2_8c_source.html#l00227">227</a> of file <a class="el" href="index__v2_8c_source.html">index_v2.c</a>.</p>
|
|||
|
|
|
|||
|
|
<p class="reference">References <a class="el" href="crc64_8c_source.html#l00141">aaruf_crc64_final()</a>, <a class="el" href="crc64_8c_source.html#l00155">aaruf_crc64_free()</a>, <a class="el" href="crc64_8c_source.html#l00032">aaruf_crc64_init()</a>, <a class="el" href="crc64_8c_source.html#l00055">aaruf_crc64_update()</a>, <a class="el" href="errors_8h_source.html#l00045">AARUF_ERROR_CANNOT_READ_HEADER</a>, <a class="el" href="errors_8h_source.html#l00043">AARUF_ERROR_CANNOT_READ_INDEX</a>, <a class="el" href="errors_8h_source.html#l00057">AARUF_ERROR_INVALID_BLOCK_CRC</a>, <a class="el" href="errors_8h_source.html#l00040">AARUF_ERROR_NOT_AARUFORMAT</a>, <a class="el" href="errors_8h_source.html#l00048">AARUF_ERROR_NOT_ENOUGH_MEMORY</a>, <a class="el" href="errors_8h_source.html#l00075">AARUF_STATUS_OK</a>, <a class="el" href="consts_8h_source.html#l00071">AARUF_VERSION_V1</a>, <a class="el" href="endian_8h_source.html#l00081">bswap_64</a>, <a class="el" href="index_8h_source.html#l00082">IndexHeader2::crc64</a>, <a class="el" href="index_8h_source.html#l00081">IndexHeader2::entries</a>, <a class="el" href="log_8h_source.html#l00040">FATAL</a>, <a class="el" href="context_8h_source.html#l00175">aaruformat_context::header</a>, <a class="el" href="index_8h_source.html#l00080">IndexHeader2::identifier</a>, <a class="el" href="header_8h_source.html#l00110">AaruHeaderV2::imageMajorVersion</a>, <a class="el" href="context_8h_source.html#l00176">aaruformat_context::imageStream</a>, <a class="el" href="enums_8h_source.html#l00146">IndexBlock2</a>, <a class="el" href="header_8h_source.html#l00115">AaruHeaderV2::indexOffset</a>, and <a class="el" href="log_8h_source.html#l00025">TRACE</a>.</p>
|
|||
|
|
|
|||
|
|
<p class="reference">Referenced by <a class="el" href="verify_8c_source.html#l00130">aaruf_verify_image()</a>.</p>
|
|||
|
|
|
|||
|
|
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|
|||
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|
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