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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">aaru_options Struct Reference</div></div>
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<div class="contents">
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<p>Parsed user-specified tunables controlling compression, deduplication, hashing and DDT geometry.
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<a href="#details">More...</a></p>
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<p><code>#include <<a class="el" href="options_8h_source.html">aaruformat/structs/options.h</a>></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-pub-attribs" class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
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Data Fields</h2></td></tr>
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<tr class="memitem:a4db2ac219f4d13ff2c35b8d62babaca2" id="r_a4db2ac219f4d13ff2c35b8d62babaca2"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#a4db2ac219f4d13ff2c35b8d62babaca2">compress</a></td></tr>
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<tr class="memdesc:a4db2ac219f4d13ff2c35b8d62babaca2"><td class="mdescLeft"> </td><td class="mdescRight">Enable adaptive compression (LZMA for data blocks, FLAC for audio). Default: true. <br /></td></tr>
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<tr class="memitem:a2d62d4cd6f1e59c145e3c4bc621f7d43" id="r_a2d62d4cd6f1e59c145e3c4bc621f7d43"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#a2d62d4cd6f1e59c145e3c4bc621f7d43">deduplicate</a></td></tr>
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<tr class="memdesc:a2d62d4cd6f1e59c145e3c4bc621f7d43"><td class="mdescLeft"> </td><td class="mdescRight">Storage dedup flag (DDT always exists). <br /></td></tr>
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<tr class="memitem:a471cdd9988e95b36ee132cd047576237" id="r_a471cdd9988e95b36ee132cd047576237"><td class="memItemLeft" align="right" valign="top">uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#a471cdd9988e95b36ee132cd047576237">dictionary</a></td></tr>
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<tr class="memdesc:a471cdd9988e95b36ee132cd047576237"><td class="mdescLeft"> </td><td class="mdescRight">LZMA dictionary size in bytes (>= 4096 recommended). Default: 33554432 (32 MiB). <br /></td></tr>
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<tr class="memitem:a8b82ce71c52cc737f7b73334e094a795" id="r_a8b82ce71c52cc737f7b73334e094a795"><td class="memItemLeft" align="right" valign="top">int8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#a8b82ce71c52cc737f7b73334e094a795">table_shift</a></td></tr>
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<tr class="memdesc:a8b82ce71c52cc737f7b73334e094a795"><td class="mdescLeft"> </td><td class="mdescRight">DDT table shift (multi-level fan-out exponent). Default: heuristically calculated. <br /></td></tr>
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<tr class="memitem:a3b6341d5cbd1ed2c4ff0686cd88de753" id="r_a3b6341d5cbd1ed2c4ff0686cd88de753"><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#a3b6341d5cbd1ed2c4ff0686cd88de753">data_shift</a></td></tr>
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<tr class="memdesc:a3b6341d5cbd1ed2c4ff0686cd88de753"><td class="mdescLeft"> </td><td class="mdescRight">Global data shift: low bits encode sector offset inside a block (2^data_shift span). <br /></td></tr>
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<tr class="memitem:aea2e536712f73ad12dcca704b47dc48c" id="r_aea2e536712f73ad12dcca704b47dc48c"><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#aea2e536712f73ad12dcca704b47dc48c">block_alignment</a></td></tr>
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<tr class="memdesc:aea2e536712f73ad12dcca704b47dc48c"><td class="mdescLeft"> </td><td class="mdescRight">log2 underlying block alignment (2^n bytes). Default: 9 (512 bytes). <br /></td></tr>
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<tr class="memitem:a93c09eed5b0613fa25dd84c7d3c2a416" id="r_a93c09eed5b0613fa25dd84c7d3c2a416"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#a93c09eed5b0613fa25dd84c7d3c2a416">md5</a></td></tr>
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<tr class="memdesc:a93c09eed5b0613fa25dd84c7d3c2a416"><td class="mdescLeft"> </td><td class="mdescRight">Generate MD5 checksum (ChecksumAlgorithm::Md5) when finalizing image. <br /></td></tr>
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<tr class="memitem:ae3ff963481af06c7e097bdaa0c925bb6" id="r_ae3ff963481af06c7e097bdaa0c925bb6"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#ae3ff963481af06c7e097bdaa0c925bb6">sha1</a></td></tr>
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<tr class="memdesc:ae3ff963481af06c7e097bdaa0c925bb6"><td class="mdescLeft"> </td><td class="mdescRight">Generate SHA-1 checksum (ChecksumAlgorithm::Sha1) when finalizing image. <br /></td></tr>
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<tr class="memitem:a522d922c2ab6e04ce8e7051aaf953093" id="r_a522d922c2ab6e04ce8e7051aaf953093"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#a522d922c2ab6e04ce8e7051aaf953093">sha256</a></td></tr>
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<tr class="memdesc:a522d922c2ab6e04ce8e7051aaf953093"><td class="mdescLeft"> </td><td class="mdescRight">Generate SHA-256 checksum (ChecksumAlgorithm::Sha256) when finalizing image. <br /></td></tr>
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<tr class="memitem:abfbdc9267e6db5222e04ffd5a963b3a7" id="r_abfbdc9267e6db5222e04ffd5a963b3a7"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#abfbdc9267e6db5222e04ffd5a963b3a7">blake3</a></td></tr>
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<tr class="memdesc:abfbdc9267e6db5222e04ffd5a963b3a7"><td class="mdescLeft"> </td><td class="mdescRight">Generate BLAKE3 checksum if supported (not stored if algorithm unavailable). <br /></td></tr>
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<tr class="memitem:a623a984dfec7abd375e7ef3d97333a4f" id="r_a623a984dfec7abd375e7ef3d97333a4f"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#a623a984dfec7abd375e7ef3d97333a4f">spamsum</a></td></tr>
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<tr class="memdesc:a623a984dfec7abd375e7ef3d97333a4f"><td class="mdescLeft"> </td><td class="mdescRight">Generate SpamSum fuzzy hash (ChecksumAlgorithm::SpamSum) if enabled. <br /></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>Parsed user-specified tunables controlling compression, deduplication, hashing and DDT geometry. </p>
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<p>All shifts are exponents of two. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00216">216</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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</div><a name="doc-variable-members" id="doc-variable-members"></a><h2 id="header-doc-variable-members" class="groupheader">Field Documentation</h2>
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<a id="abfbdc9267e6db5222e04ffd5a963b3a7" name="abfbdc9267e6db5222e04ffd5a963b3a7"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#abfbdc9267e6db5222e04ffd5a963b3a7">◆ </a></span>blake3</h2>
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<td class="memname">bool aaru_options::blake3</td>
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</div><div class="memdoc">
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<p>Generate BLAKE3 checksum if supported (not stored if algorithm unavailable). </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00228">228</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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</div>
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<a id="aea2e536712f73ad12dcca704b47dc48c" name="aea2e536712f73ad12dcca704b47dc48c"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#aea2e536712f73ad12dcca704b47dc48c">◆ </a></span>block_alignment</h2>
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<td class="memname">uint8_t aaru_options::block_alignment</td>
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</table>
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</div><div class="memdoc">
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<p>log2 underlying block alignment (2^n bytes). Default: 9 (512 bytes). </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00224">224</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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</div>
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<a id="a4db2ac219f4d13ff2c35b8d62babaca2" name="a4db2ac219f4d13ff2c35b8d62babaca2"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a4db2ac219f4d13ff2c35b8d62babaca2">◆ </a></span>compress</h2>
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<td class="memname">bool aaru_options::compress</td>
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</table>
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</div><div class="memdoc">
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<p>Enable adaptive compression (LZMA for data blocks, FLAC for audio). Default: true. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00218">218</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a3b6341d5cbd1ed2c4ff0686cd88de753" name="a3b6341d5cbd1ed2c4ff0686cd88de753"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a3b6341d5cbd1ed2c4ff0686cd88de753">◆ </a></span>data_shift</h2>
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<td class="memname">uint8_t aaru_options::data_shift</td>
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<p>Global data shift: low bits encode sector offset inside a block (2^data_shift span). </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00223">223</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a2d62d4cd6f1e59c145e3c4bc621f7d43" name="a2d62d4cd6f1e59c145e3c4bc621f7d43"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a2d62d4cd6f1e59c145e3c4bc621f7d43">◆ </a></span>deduplicate</h2>
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<td class="memname">bool aaru_options::deduplicate</td>
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<p>Storage dedup flag (DDT always exists). </p>
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<p>true=share identical sector content, false=store each instance. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00219">219</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a471cdd9988e95b36ee132cd047576237" name="a471cdd9988e95b36ee132cd047576237"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a471cdd9988e95b36ee132cd047576237">◆ </a></span>dictionary</h2>
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<td class="memname">uint32_t aaru_options::dictionary</td>
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<p>LZMA dictionary size in bytes (>= 4096 recommended). Default: 33554432 (32 MiB). </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00221">221</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a93c09eed5b0613fa25dd84c7d3c2a416" name="a93c09eed5b0613fa25dd84c7d3c2a416"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a93c09eed5b0613fa25dd84c7d3c2a416">◆ </a></span>md5</h2>
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<td class="memname">bool aaru_options::md5</td>
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<p>Generate MD5 checksum (ChecksumAlgorithm::Md5) when finalizing image. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00225">225</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="ae3ff963481af06c7e097bdaa0c925bb6" name="ae3ff963481af06c7e097bdaa0c925bb6"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ae3ff963481af06c7e097bdaa0c925bb6">◆ </a></span>sha1</h2>
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<p>Generate SHA-1 checksum (ChecksumAlgorithm::Sha1) when finalizing image. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00226">226</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a522d922c2ab6e04ce8e7051aaf953093" name="a522d922c2ab6e04ce8e7051aaf953093"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a522d922c2ab6e04ce8e7051aaf953093">◆ </a></span>sha256</h2>
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<td class="memname">bool aaru_options::sha256</td>
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<p>Generate SHA-256 checksum (ChecksumAlgorithm::Sha256) when finalizing image. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00227">227</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a623a984dfec7abd375e7ef3d97333a4f" name="a623a984dfec7abd375e7ef3d97333a4f"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a623a984dfec7abd375e7ef3d97333a4f">◆ </a></span>spamsum</h2>
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<td class="memname">bool aaru_options::spamsum</td>
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<p>Generate SpamSum fuzzy hash (ChecksumAlgorithm::SpamSum) if enabled. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00229">229</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<a id="a8b82ce71c52cc737f7b73334e094a795" name="a8b82ce71c52cc737f7b73334e094a795"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a8b82ce71c52cc737f7b73334e094a795">◆ </a></span>table_shift</h2>
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<td class="memname">int8_t aaru_options::table_shift</td>
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<p>DDT table shift (multi-level fan-out exponent). Default: heuristically calculated. </p>
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<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00222">222</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>
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<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00279">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00038">parse_options()</a>.</p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
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<li>include/aaruformat/structs/<a class="el" href="options_8h_source.html">options.h</a></li>
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<li class="navelem"><a href="structaaru__options.html">aaru_options</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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