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<div id="projectname">libaaruformat<span id="projectnumber">&#160;1.0</span>
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<div id="projectbrief">Aaru Data Preservation Suite - Format Library</div>
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<a href="lru_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#include &lt;stddef.h&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include &lt;uthash.h&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include &lt;<a class="code" href="aaruformat_8h.html">aaruformat.h</a>&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">// LRU cache using uthash with native integer keys.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">// Based on uthash LRU example by Jehiah Czebotar 2011 (public domain).</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">// Rewritten to use HASH_FIND/HASH_ADD with uint64_t keys directly,</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">// eliminating all string conversion, malloc, and snprintf overhead</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">// from the hot path.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span></div>
<div class="foldopen" id="foldopen00024" data-start="{" data-end="}">
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="lru_8h.html#a8cb7ac8e057627210732ee61d2966e35"> 24</a></span><span class="keywordtype">void</span> *<a class="code hl_function" href="lru_8c.html#af628823e6826f0d0e0aa52f96fc74f02">find_in_cache_uint64</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structCacheHeader.html">CacheHeader</a> *cache, <span class="keyword">const</span> uint64_t key)</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span>{</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">struct </span><a class="code hl_struct" href="structCacheEntry.html">CacheEntry</a> *entry = NULL;</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> HASH_FIND(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, &amp;<a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a>, <span class="keyword">sizeof</span>(uint64_t), entry);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordflow">if</span>(entry)</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> {</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// Remove and re-add to move to front of insertion-order list (LRU refresh).</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> HASH_DELETE(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, entry);</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> HASH_ADD(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, <a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a>, <span class="keyword">sizeof</span>(uint64_t), entry);</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">return</span> entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> }</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>}</div>
</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span></div>
<div class="foldopen" id="foldopen00048" data-start="{" data-end="}">
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"><a class="line" href="lru_8h.html#a0735969939ca80db3fe439ed92b787bb"> 48</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="lru_8c.html#a06d1782c0ae7cb53efa1b5e0f63c5ccb">add_to_cache_uint64</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structCacheHeader.html">CacheHeader</a> *cache, <span class="keyword">const</span> uint64_t <a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a>, <span class="keywordtype">void</span> *<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>)</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>{</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">struct </span><a class="code hl_struct" href="structCacheEntry.html">CacheEntry</a> *entry = malloc(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code hl_struct" href="structCacheEntry.html">CacheEntry</a>));</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">if</span>(!entry) <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a> = <a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a>;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a> = <a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> HASH_ADD(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, <a class="code hl_variable" href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">key</a>, <span class="keyword">sizeof</span>(uint64_t), entry);</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="comment">// Evict oldest entry if cache exceeded capacity.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordflow">if</span>(HASH_COUNT(cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>) &gt; cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#ad3b962f8ce6c6115143cf581c7936e55">max_items</a>)</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> {</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">struct </span><a class="code hl_struct" href="structCacheEntry.html">CacheEntry</a> *tmp_entry;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> HASH_ITER(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, entry, tmp_entry)</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> HASH_DELETE(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, entry);</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">if</span>(cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#afeac54c794f8fece845e49954fd89f1a">free_func</a> &amp;&amp; entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>)</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#afeac54c794f8fece845e49954fd89f1a">free_func</a>(entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> free(entry);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>}</div>
</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span></div>
<div class="foldopen" id="foldopen00082" data-start="{" data-end="}">
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"><a class="line" href="lru_8h.html#a92e298695411672c3497ae5c8d9c0427"> 82</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="lru_8c.html#a92e298695411672c3497ae5c8d9c0427">free_cache</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structCacheHeader.html">CacheHeader</a> *cache)</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>{</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keyword">struct </span><a class="code hl_struct" href="structCacheEntry.html">CacheEntry</a> *entry, *tmp;</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keywordflow">if</span>(!cache || !cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>) <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> HASH_ITER(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, entry, tmp)</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> {</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> HASH_DELETE(<a class="code hl_variable" href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">hh</a>, cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a>, entry);</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="keywordflow">if</span>(cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#afeac54c794f8fece845e49954fd89f1a">free_func</a> &amp;&amp; entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>)</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#afeac54c794f8fece845e49954fd89f1a">free_func</a>(entry-&gt;<a class="code hl_variable" href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">value</a>);</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> free(entry);</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> }</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> cache-&gt;<a class="code hl_variable" href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">cache</a> = NULL;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>}</div>
</div>
<div class="ttc" id="aaaruformat_8h_html"><div class="ttname"><a href="aaruformat_8h.html">aaruformat.h</a></div></div>
<div class="ttc" id="alru_8c_html_a06d1782c0ae7cb53efa1b5e0f63c5ccb"><div class="ttname"><a href="lru_8c.html#a06d1782c0ae7cb53efa1b5e0f63c5ccb">add_to_cache_uint64</a></div><div class="ttdeci">void add_to_cache_uint64(struct CacheHeader *cache, const uint64_t key, void *value)</div><div class="ttdoc">Adds a value to the cache with a uint64_t key, evicting LRU if full.</div><div class="ttdef"><b>Definition</b> <a href="#l00048">lru.c:48</a></div></div>
<div class="ttc" id="alru_8c_html_a92e298695411672c3497ae5c8d9c0427"><div class="ttname"><a href="lru_8c.html#a92e298695411672c3497ae5c8d9c0427">free_cache</a></div><div class="ttdeci">void free_cache(struct CacheHeader *cache)</div><div class="ttdoc">Frees all entries in the cache and clears it.</div><div class="ttdef"><b>Definition</b> <a href="#l00082">lru.c:82</a></div></div>
<div class="ttc" id="alru_8c_html_af628823e6826f0d0e0aa52f96fc74f02"><div class="ttname"><a href="lru_8c.html#af628823e6826f0d0e0aa52f96fc74f02">find_in_cache_uint64</a></div><div class="ttdeci">void * find_in_cache_uint64(struct CacheHeader *cache, const uint64_t key)</div><div class="ttdoc">Finds a value in the cache by uint64_t key.</div><div class="ttdef"><b>Definition</b> <a href="#l00024">lru.c:24</a></div></div>
<div class="ttc" id="astructCacheEntry_html"><div class="ttname"><a href="structCacheEntry.html">CacheEntry</a></div><div class="ttdoc">Single hash entry in the in-memory cache.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00023">lru.h:24</a></div></div>
<div class="ttc" id="astructCacheEntry_html_a7d6d1ed0aab03cffbb34aff16f6f3d56"><div class="ttname"><a href="structCacheEntry.html#a7d6d1ed0aab03cffbb34aff16f6f3d56">CacheEntry::value</a></div><div class="ttdeci">void * value</div><div class="ttdoc">Opaque value pointer associated with key.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00026">lru.h:26</a></div></div>
<div class="ttc" id="astructCacheEntry_html_acee4cc303db10f54cfe2314142f24428"><div class="ttname"><a href="structCacheEntry.html#acee4cc303db10f54cfe2314142f24428">CacheEntry::key</a></div><div class="ttdeci">uint64_t key</div><div class="ttdoc">64-bit integer key (unique within the cache).</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00025">lru.h:25</a></div></div>
<div class="ttc" id="astructCacheEntry_html_ae7e5f03fa52b88d99e27e2433623b4f5"><div class="ttname"><a href="structCacheEntry.html#ae7e5f03fa52b88d99e27e2433623b4f5">CacheEntry::hh</a></div><div class="ttdeci">UT_hash_handle hh</div><div class="ttdoc">uthash handle (must remain per uthash docs).</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00027">lru.h:27</a></div></div>
<div class="ttc" id="astructCacheHeader_html"><div class="ttname"><a href="structCacheHeader.html">CacheHeader</a></div><div class="ttdoc">Cache top-level descriptor encapsulating the hash table root and capacity limit.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00041">lru.h:42</a></div></div>
<div class="ttc" id="astructCacheHeader_html_a44229bb929d8949f3c2700d07123d224"><div class="ttname"><a href="structCacheHeader.html#a44229bb929d8949f3c2700d07123d224">CacheHeader::cache</a></div><div class="ttdeci">struct CacheEntry * cache</div><div class="ttdoc">Hash root (uthash). NULL when empty.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00044">lru.h:44</a></div></div>
<div class="ttc" id="astructCacheHeader_html_ad3b962f8ce6c6115143cf581c7936e55"><div class="ttname"><a href="structCacheHeader.html#ad3b962f8ce6c6115143cf581c7936e55">CacheHeader::max_items</a></div><div class="ttdeci">uint64_t max_items</div><div class="ttdoc">Hard limit for number of entries.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00043">lru.h:43</a></div></div>
<div class="ttc" id="astructCacheHeader_html_afeac54c794f8fece845e49954fd89f1a"><div class="ttname"><a href="structCacheHeader.html#afeac54c794f8fece845e49954fd89f1a">CacheHeader::free_func</a></div><div class="ttdeci">void(* free_func)(void *)</div><div class="ttdoc">Optional callback to free cached values. NULL if not needed.</div><div class="ttdef"><b>Definition</b> <a href="lru_8h_source.html#l00045">lru.h:45</a></div></div>
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