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<div class="header">
  <div class="headertitle"><div class="title">aaru_options Struct Reference</div></div>
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<p>Parsed user-specified tunables controlling compression, deduplication, hashing and DDT geometry.  
 <a href="#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="options_8h_source.html">aaruformat/structs/options.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-pub-attribs" class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:a4db2ac219f4d13ff2c35b8d62babaca2" id="r_a4db2ac219f4d13ff2c35b8d62babaca2"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a4db2ac219f4d13ff2c35b8d62babaca2">compress</a></td></tr>
<tr class="memdesc:a4db2ac219f4d13ff2c35b8d62babaca2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Enable adaptive compression (LZMA for data blocks, FLAC for audio). Default: true.  <br /></td></tr>
<tr class="memitem:a2d62d4cd6f1e59c145e3c4bc621f7d43" id="r_a2d62d4cd6f1e59c145e3c4bc621f7d43"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a2d62d4cd6f1e59c145e3c4bc621f7d43">deduplicate</a></td></tr>
<tr class="memdesc:a2d62d4cd6f1e59c145e3c4bc621f7d43"><td class="mdescLeft">&#160;</td><td class="mdescRight">Storage dedup flag (DDT always exists).  <br /></td></tr>
<tr class="memitem:a471cdd9988e95b36ee132cd047576237" id="r_a471cdd9988e95b36ee132cd047576237"><td class="memItemLeft">uint32_t&#160;</td><td class="memItemRight"><a class="el" href="#a471cdd9988e95b36ee132cd047576237">dictionary</a></td></tr>
<tr class="memdesc:a471cdd9988e95b36ee132cd047576237"><td class="mdescLeft">&#160;</td><td class="mdescRight">LZMA dictionary size in bytes (&gt;= 4096 recommended). Default: 33554432 (32 MiB).  <br /></td></tr>
<tr class="memitem:a8b82ce71c52cc737f7b73334e094a795" id="r_a8b82ce71c52cc737f7b73334e094a795"><td class="memItemLeft">int8_t&#160;</td><td class="memItemRight"><a class="el" href="#a8b82ce71c52cc737f7b73334e094a795">table_shift</a></td></tr>
<tr class="memdesc:a8b82ce71c52cc737f7b73334e094a795"><td class="mdescLeft">&#160;</td><td class="mdescRight">DDT table shift (multi-level fan-out exponent). Default: heuristically calculated.  <br /></td></tr>
<tr class="memitem:a3b6341d5cbd1ed2c4ff0686cd88de753" id="r_a3b6341d5cbd1ed2c4ff0686cd88de753"><td class="memItemLeft">uint8_t&#160;</td><td class="memItemRight"><a class="el" href="#a3b6341d5cbd1ed2c4ff0686cd88de753">data_shift</a></td></tr>
<tr class="memdesc:a3b6341d5cbd1ed2c4ff0686cd88de753"><td class="mdescLeft">&#160;</td><td class="mdescRight">Global data shift: low bits encode sector offset inside a block (2^data_shift span).  <br /></td></tr>
<tr class="memitem:aea2e536712f73ad12dcca704b47dc48c" id="r_aea2e536712f73ad12dcca704b47dc48c"><td class="memItemLeft">uint8_t&#160;</td><td class="memItemRight"><a class="el" href="#aea2e536712f73ad12dcca704b47dc48c">block_alignment</a></td></tr>
<tr class="memdesc:aea2e536712f73ad12dcca704b47dc48c"><td class="mdescLeft">&#160;</td><td class="mdescRight">log2 underlying block alignment (2^n bytes). Default: 9 (512 bytes).  <br /></td></tr>
<tr class="memitem:a93c09eed5b0613fa25dd84c7d3c2a416" id="r_a93c09eed5b0613fa25dd84c7d3c2a416"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a93c09eed5b0613fa25dd84c7d3c2a416">md5</a></td></tr>
<tr class="memdesc:a93c09eed5b0613fa25dd84c7d3c2a416"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate MD5 checksum (ChecksumAlgorithm::Md5) when finalizing image.  <br /></td></tr>
<tr class="memitem:ae3ff963481af06c7e097bdaa0c925bb6" id="r_ae3ff963481af06c7e097bdaa0c925bb6"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#ae3ff963481af06c7e097bdaa0c925bb6">sha1</a></td></tr>
<tr class="memdesc:ae3ff963481af06c7e097bdaa0c925bb6"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate SHA-1 checksum (ChecksumAlgorithm::Sha1) when finalizing image.  <br /></td></tr>
<tr class="memitem:a522d922c2ab6e04ce8e7051aaf953093" id="r_a522d922c2ab6e04ce8e7051aaf953093"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a522d922c2ab6e04ce8e7051aaf953093">sha256</a></td></tr>
<tr class="memdesc:a522d922c2ab6e04ce8e7051aaf953093"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate SHA-256 checksum (ChecksumAlgorithm::Sha256) when finalizing image.  <br /></td></tr>
<tr class="memitem:abfbdc9267e6db5222e04ffd5a963b3a7" id="r_abfbdc9267e6db5222e04ffd5a963b3a7"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#abfbdc9267e6db5222e04ffd5a963b3a7">blake3</a></td></tr>
<tr class="memdesc:abfbdc9267e6db5222e04ffd5a963b3a7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate BLAKE3 checksum if supported (not stored if algorithm unavailable).  <br /></td></tr>
<tr class="memitem:a623a984dfec7abd375e7ef3d97333a4f" id="r_a623a984dfec7abd375e7ef3d97333a4f"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a623a984dfec7abd375e7ef3d97333a4f">spamsum</a></td></tr>
<tr class="memdesc:a623a984dfec7abd375e7ef3d97333a4f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate SpamSum fuzzy hash (ChecksumAlgorithm::SpamSum) if enabled.  <br /></td></tr>
<tr class="memitem:a1aa493849a34cecf06f19b34ee02ae05" id="r_a1aa493849a34cecf06f19b34ee02ae05"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a1aa493849a34cecf06f19b34ee02ae05">zstd</a></td></tr>
<tr class="memdesc:a1aa493849a34cecf06f19b34ee02ae05"><td class="mdescLeft">&#160;</td><td class="mdescRight">Use Zstandard instead of LZMA for data blocks. Default: false.  <br /></td></tr>
<tr class="memitem:a2d8010e4373bb5a97e59a3268b301d74" id="r_a2d8010e4373bb5a97e59a3268b301d74"><td class="memItemLeft">int&#160;</td><td class="memItemRight"><a class="el" href="#a2d8010e4373bb5a97e59a3268b301d74">zstd_level</a></td></tr>
<tr class="memdesc:a2d8010e4373bb5a97e59a3268b301d74"><td class="mdescLeft">&#160;</td><td class="mdescRight">Zstandard compression level (1-22). Default: 19.  <br /></td></tr>
<tr class="memitem:a8fd937eb8cc58a3e83e1318d38b3345a" id="r_a8fd937eb8cc58a3e83e1318d38b3345a"><td class="memItemLeft">int&#160;</td><td class="memItemRight"><a class="el" href="#a8fd937eb8cc58a3e83e1318d38b3345a">num_threads</a></td></tr>
<tr class="memdesc:a8fd937eb8cc58a3e83e1318d38b3345a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of compression worker threads.  <br /></td></tr>
</table>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Parsed user-specified tunables controlling compression, deduplication, hashing and DDT geometry. </p>
<p>All shifts are exponents of two. </p>

<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>
</div><a name="doc-variable-members" id="doc-variable-members"></a><h2 id="header-doc-variable-members" class="groupheader">Field Documentation</h2>
<a id="abfbdc9267e6db5222e04ffd5a963b3a7" name="abfbdc9267e6db5222e04ffd5a963b3a7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abfbdc9267e6db5222e04ffd5a963b3a7">&#9670;&#160;</a></span>blake3</h2>

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<p>Generate BLAKE3 checksum if supported (not stored if algorithm unavailable). </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00231">231</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#aea2e536712f73ad12dcca704b47dc48c">&#9670;&#160;</a></span>block_alignment</h2>

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<p>log2 underlying block alignment (2^n bytes). Default: 9 (512 bytes). </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a4db2ac219f4d13ff2c35b8d62babaca2">&#9670;&#160;</a></span>compress</h2>

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<p>Enable adaptive compression (LZMA for data blocks, FLAC for audio). Default: true. </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, <a class="el" href="open_8c_source.html#l00236">aaruf_open()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a3b6341d5cbd1ed2c4ff0686cd88de753">&#9670;&#160;</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>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a2d62d4cd6f1e59c145e3c4bc621f7d43">&#9670;&#160;</a></span>deduplicate</h2>

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<p>Storage dedup flag (DDT always exists). </p>
<p>true=share identical sector content, false=store each instance. </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, <a class="el" href="open_8c_source.html#l00236">aaruf_open()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a471cdd9988e95b36ee132cd047576237">&#9670;&#160;</a></span>dictionary</h2>

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<p>LZMA dictionary size in bytes (&gt;= 4096 recommended). Default: 33554432 (32 MiB). </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, <a class="el" href="open_8c_source.html#l00236">aaruf_open()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a93c09eed5b0613fa25dd84c7d3c2a416">&#9670;&#160;</a></span>md5</h2>

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<p>Generate MD5 checksum (ChecksumAlgorithm::Md5) when finalizing image. </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a8fd937eb8cc58a3e83e1318d38b3345a">&#9670;&#160;</a></span>num_threads</h2>

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<p>Number of compression worker threads. </p>
<p>Default: 1 (single-threaded). zstd: passed as nbWorkers (0 and 1 both mean single-threaded). LZMA: clamped to [1, 2] (2 = threaded match finder). </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00235">235</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#ae3ff963481af06c7e097bdaa0c925bb6">&#9670;&#160;</a></span>sha1</h2>

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<p>Generate SHA-1 checksum (ChecksumAlgorithm::Sha1) when finalizing image. </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a522d922c2ab6e04ce8e7051aaf953093">&#9670;&#160;</a></span>sha256</h2>

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<p>Generate SHA-256 checksum (ChecksumAlgorithm::Sha256) when finalizing image. </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00230">230</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a623a984dfec7abd375e7ef3d97333a4f">&#9670;&#160;</a></span>spamsum</h2>

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<p>Generate SpamSum fuzzy hash (ChecksumAlgorithm::SpamSum) if enabled. </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00232">232</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a8b82ce71c52cc737f7b73334e094a795">&#9670;&#160;</a></span>table_shift</h2>

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<p>DDT table shift (multi-level fan-out exponent). Default: heuristically calculated. </p>

<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>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a1aa493849a34cecf06f19b34ee02ae05">&#9670;&#160;</a></span>zstd</h2>

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          <td class="memname">bool aaru_options::zstd</td>
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<p>Use Zstandard instead of LZMA for data blocks. Default: false. </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00233">233</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a2d8010e4373bb5a97e59a3268b301d74">&#9670;&#160;</a></span>zstd_level</h2>

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          <td class="memname">int aaru_options::zstd_level</td>
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<p>Zstandard compression level (1-22). Default: 19. </p>

<p class="definition">Definition at line <a class="el" href="options_8h_source.html#l00234">234</a> of file <a class="el" href="options_8h_source.html">options.h</a>.</p>

<p class="reference">Referenced by <a class="el" href="create_8c_source.html#l00291">aaruf_create()</a>, and <a class="el" href="options_8c_source.html#l00047">parse_options()</a>.</p>

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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>include/aaruformat/structs/<a class="el" href="options_8h_source.html">options.h</a></li>
</ul>
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