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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="lfg_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="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * This file is part of the Aaru Data Preservation Suite.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (c) 2019-2026 Natalia Portillo.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * This library is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * it under the terms of the GNU Lesser General Public License as</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * published by the Free Software Foundation; version 2.1 of the License.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> * This library is distributed in the hope that it will be useful, but</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> *</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * License along with this library; if not, see</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * &lt;https://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> *</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> * Lagged Fibonacci Generator for Nintendo GameCube/Wii junk fill.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"> * Based on Dolphin emulator&#39;s LaggedFibonacciGenerator (CC0 licensed).</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> */</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include &quot;<a class="code" href="lfg_8h.html">lfg.h</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> </div>
<div class="foldopen" id="foldopen00026" data-start="{" data-end="}">
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9"> 26</a></span><span class="keyword">static</span> <span class="keyword">inline</span> uint32_t <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>(uint32_t x)</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span>{ <span class="keywordflow">return</span> ((x &gt;&gt; 24) &amp; 0xFF) | ((x &gt;&gt; 8) &amp; 0xFF00) | ((x &lt;&lt; 8) &amp; 0xFF0000) | ((x &lt;&lt; 24) &amp; 0xFF000000); }</div>
</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="foldopen" id="foldopen00029" data-start="{" data-end="}">
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"><a class="line" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900"> 29</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx)</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span>{</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>; i++) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] ^= ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i + <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> - <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>];</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] ^= ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>];</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span>}</div>
</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="foldopen" id="foldopen00036" data-start="{" data-end="}">
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"><a class="line" href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77"> 36</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77">lfg_backward</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx, <span class="keywordtype">size_t</span> start_word, <span class="keywordtype">size_t</span> end_word)</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>{</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">size_t</span> loop_end = <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a> &gt; start_word ? <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a> : start_word;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keywordtype">size_t</span> upper = end_word &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> ? end_word : <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = upper; i &gt; loop_end; --i) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 1] ^= ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 1 - <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>];</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordtype">size_t</span> upper2 = end_word &lt; <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a> ? end_word : <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = upper2; i &gt; start_word; --i) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 1] ^= ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 1 + <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> - <a class="code hl_define" href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a>];</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span>}</div>
</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</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="lfg_8c.html#a46e2707c175bb96188106c86fdcb1953"> 48</a></span><span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="lfg_8c.html#a46e2707c175bb96188106c86fdcb1953">lfg_initialize</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx, <span class="keywordtype">bool</span> check_existing)</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="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = <a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++)</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> {</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> uint32_t calculated = (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 17] &lt;&lt; 23) ^ (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 16] &gt;&gt; 9) ^ ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i - 1];</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordflow">if</span>(check_existing)</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> uint32_t actual = (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &amp; 0xFF00FFFF) | (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &lt;&lt; 2 &amp; 0x00FC0000);</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordflow">if</span>((calculated &amp; 0xFFFCFFFF) != actual) <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = calculated;</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> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="comment">/* Apply the shift-by-18-instead-of-16 quirk + byteswap */</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++)</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>((ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &amp; 0xFF00FFFF) | ((ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &gt;&gt; 2) &amp; 0x00FF0000));</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> <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; 4; i++) <a class="code hl_function" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a>(ctx);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>}</div>
</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="foldopen" id="foldopen00073" data-start="{" data-end="}">
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"><a class="line" href="lfg_8c.html#abc583da3bb66cab3eafc3496bc46e193"> 73</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="lfg_8c.html#abc583da3bb66cab3eafc3496bc46e193">ngc_lfg_set_seed</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx, <span class="keyword">const</span> uint32_t seed[<a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>])</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span>{</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> = 0;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>; i++) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>(seed[i]);</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <a class="code hl_function" href="lfg_8c.html#a46e2707c175bb96188106c86fdcb1953">lfg_initialize</a>(ctx, <span class="keyword">false</span>);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>}</div>
</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</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="lfg_8c.html#a25e6df5ee051a324d943185f193d3418"> 82</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="lfg_8c.html#a25e6df5ee051a324d943185f193d3418">ngc_lfg_get_bytes</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx, uint8_t *out, <span class="keywordtype">size_t</span> count)</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="keywordflow">while</span>(count &gt; 0)</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="keywordtype">size_t</span> avail = <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> * <span class="keyword">sizeof</span>(uint32_t) - ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a>;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">size_t</span> chunk = count &lt; avail ? count : avail;</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> memcpy(out, (uint8_t *)ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a> + ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a>, chunk);</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> += chunk;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> count -= chunk;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> out += chunk;</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> <span class="keywordflow">if</span>(ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> == <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> * <span class="keyword">sizeof</span>(uint32_t))</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> <a class="code hl_function" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a>(ctx);</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> = 0;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> }</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> }</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span>}</div>
</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="foldopen" id="foldopen00103" data-start="{" data-end="}">
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"><a class="line" href="lfg_8c.html#a7a8fe75a120f047f2a2fad61d664d9da"> 103</a></span><span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="lfg_8c.html#a7a8fe75a120f047f2a2fad61d664d9da">lfg_reinitialize</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> *ctx, uint32_t seed_out[<a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>])</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span>{</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; 4; i++) <a class="code hl_function" href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77">lfg_backward</a>(ctx, 0, <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++) ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>(ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i]);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <span class="comment">/* Reconstruct bits lost by the shift-by-18-instead-of-16 quirk */</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>; i++)</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> {</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &amp; 0xFF00FFFF) | (ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] &lt;&lt; 2 &amp; 0x00FC0000) |</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> ((ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i + 16] ^ ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i + 15]) &lt;&lt; 9 &amp; 0x00030000);</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> }</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>; i++) seed_out[i] = <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>(ctx-&gt;<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i]);</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keywordflow">return</span> <a class="code hl_function" href="lfg_8c.html#a46e2707c175bb96188106c86fdcb1953">lfg_initialize</a>(ctx, <span class="keyword">true</span>);</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span>}</div>
</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> </div>
<div class="foldopen" id="foldopen00121" data-start="{" data-end="}">
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"><a class="line" href="lfg_8c.html#aef1434f019902caf30f1d4fe577267ba"> 121</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="lfg_8c.html#aef1434f019902caf30f1d4fe577267ba">ngc_lfg_get_seed</a>(<span class="keyword">const</span> uint8_t *data, <span class="keywordtype">size_t</span> size, <span class="keywordtype">size_t</span> data_offset, uint32_t seed_out[<a class="code hl_define" href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a>])</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span>{</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="comment">/* Alignment: data - data_offset must be 4-byte aligned */</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="keywordflow">if</span>(((uintptr_t)data - data_offset) % <span class="keyword">sizeof</span>(uint32_t) != 0) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="comment">/* Work on whole u32 words */</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <span class="keywordtype">size_t</span> bytes_to_skip = ((data_offset + 3) &amp; ~(size_t)3) - data_offset;</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <span class="keywordflow">if</span>(bytes_to_skip &gt; size) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="keyword">const</span> uint32_t *u32_data = (<span class="keyword">const</span> uint32_t *)(data + bytes_to_skip);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> <span class="keywordtype">size_t</span> u32_size = (size - bytes_to_skip) / <span class="keyword">sizeof</span>(uint32_t);</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keywordtype">size_t</span> u32_data_offset = (data_offset + bytes_to_skip) / <span class="keyword">sizeof</span>(uint32_t);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> </div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keywordflow">if</span>(u32_size &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">/* Quick sanity check: the top bits have a specific pattern from the shift quirk */</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++)</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> {</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> uint32_t x = <a class="code hl_function" href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a>(u32_data[i]);</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keywordflow">if</span>((x &amp; 0x00C00000) != (x &gt;&gt; 2 &amp; 0x00C00000)) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> }</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="keyword">struct </span><a class="code hl_struct" href="structngc__lfg__ctx.html">ngc_lfg_ctx</a> lfg;</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> <span class="keywordtype">size_t</span> data_offset_mod_k = u32_data_offset % <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>;</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keywordtype">size_t</span> data_offset_div_k = u32_data_offset / <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>;</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="comment">/* Place the data into the buffer at the correct position.</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span><span class="comment"> * Copy raw native-endian u32 values — NO byte-swapping here.</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="comment"> * The swap happens later inside lfg_reinitialize/lfg_initialize. */</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keywordtype">size_t</span> first_part = <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> - data_offset_mod_k;</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> </div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="keywordflow">if</span>(first_part &gt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>) first_part = <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>;</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; first_part &amp;&amp; i &lt; <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>; i++) lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[data_offset_mod_k + i] = u32_data[i];</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> </div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; data_offset_mod_k; i++) lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>[i] = u32_data[first_part + i];</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <a class="code hl_function" href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77">lfg_backward</a>(&amp;lfg, 0, data_offset_mod_k);</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; data_offset_div_k; i++) <a class="code hl_function" href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77">lfg_backward</a>(&amp;lfg, 0, <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a>);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="keywordflow">if</span>(!<a class="code hl_function" href="lfg_8c.html#a7a8fe75a120f047f2a2fad61d664d9da">lfg_reinitialize</a>(&amp;lfg, seed_out)) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> = data_offset % (<a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> * <span class="keyword">sizeof</span>(uint32_t));</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="comment">/* Advance the LFG forward to match the data_offset position. */</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0; i &lt; data_offset_div_k; i++) <a class="code hl_function" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a>(&amp;lfg);</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> </div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="comment">/* Count how many bytes from data match the LFG output */</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="keywordtype">size_t</span> result = 0;</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="keyword">const</span> uint8_t *p = data;</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> <span class="keyword">const</span> uint8_t *end = data + size;</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> </div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="keywordflow">while</span>(p &lt; end)</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> {</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> uint8_t expected = ((uint8_t *)lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">buffer</a>)[lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a>];</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="keywordflow">if</span>(*p != expected) <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> result++;</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> p++;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a>++;</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="keywordflow">if</span>(lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> == <a class="code hl_define" href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a> * <span class="keyword">sizeof</span>(uint32_t))</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> {</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> <a class="code hl_function" href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a>(&amp;lfg);</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> lfg.<a class="code hl_variable" href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">position_bytes</a> = 0;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> }</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> }</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> </div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keywordflow">return</span> result;</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span>}</div>
</div>
<div class="ttc" id="alfg_8c_html_a25e6df5ee051a324d943185f193d3418"><div class="ttname"><a href="lfg_8c.html#a25e6df5ee051a324d943185f193d3418">ngc_lfg_get_bytes</a></div><div class="ttdeci">void ngc_lfg_get_bytes(struct ngc_lfg_ctx *ctx, uint8_t *out, size_t count)</div><div class="ttdoc">Generate count bytes of junk data into out.</div><div class="ttdef"><b>Definition</b> <a href="#l00082">lfg.c:82</a></div></div>
<div class="ttc" id="alfg_8c_html_a2f32611fcb5d9160c4bd4b6f2f1c2fa9"><div class="ttname"><a href="lfg_8c.html#a2f32611fcb5d9160c4bd4b6f2f1c2fa9">swap32</a></div><div class="ttdeci">static uint32_t swap32(uint32_t x)</div><div class="ttdef"><b>Definition</b> <a href="#l00026">lfg.c:26</a></div></div>
<div class="ttc" id="alfg_8c_html_a306c5ff9a0006e222eef0a9a79f81d77"><div class="ttname"><a href="lfg_8c.html#a306c5ff9a0006e222eef0a9a79f81d77">lfg_backward</a></div><div class="ttdeci">static void lfg_backward(struct ngc_lfg_ctx *ctx, size_t start_word, size_t end_word)</div><div class="ttdef"><b>Definition</b> <a href="#l00036">lfg.c:36</a></div></div>
<div class="ttc" id="alfg_8c_html_a46e2707c175bb96188106c86fdcb1953"><div class="ttname"><a href="lfg_8c.html#a46e2707c175bb96188106c86fdcb1953">lfg_initialize</a></div><div class="ttdeci">static bool lfg_initialize(struct ngc_lfg_ctx *ctx, bool check_existing)</div><div class="ttdef"><b>Definition</b> <a href="#l00048">lfg.c:48</a></div></div>
<div class="ttc" id="alfg_8c_html_a672ca5afd8a74c736fed44e0a89df900"><div class="ttname"><a href="lfg_8c.html#a672ca5afd8a74c736fed44e0a89df900">lfg_forward</a></div><div class="ttdeci">static void lfg_forward(struct ngc_lfg_ctx *ctx)</div><div class="ttdef"><b>Definition</b> <a href="#l00029">lfg.c:29</a></div></div>
<div class="ttc" id="alfg_8c_html_a7a8fe75a120f047f2a2fad61d664d9da"><div class="ttname"><a href="lfg_8c.html#a7a8fe75a120f047f2a2fad61d664d9da">lfg_reinitialize</a></div><div class="ttdeci">static bool lfg_reinitialize(struct ngc_lfg_ctx *ctx, uint32_t seed_out[17])</div><div class="ttdef"><b>Definition</b> <a href="#l00103">lfg.c:103</a></div></div>
<div class="ttc" id="alfg_8c_html_abc583da3bb66cab3eafc3496bc46e193"><div class="ttname"><a href="lfg_8c.html#abc583da3bb66cab3eafc3496bc46e193">ngc_lfg_set_seed</a></div><div class="ttdeci">void ngc_lfg_set_seed(struct ngc_lfg_ctx *ctx, const uint32_t seed[17])</div><div class="ttdoc">Initialize the LFG from a 17-word big-endian seed.</div><div class="ttdef"><b>Definition</b> <a href="#l00073">lfg.c:73</a></div></div>
<div class="ttc" id="alfg_8c_html_aef1434f019902caf30f1d4fe577267ba"><div class="ttname"><a href="lfg_8c.html#aef1434f019902caf30f1d4fe577267ba">ngc_lfg_get_seed</a></div><div class="ttdeci">size_t ngc_lfg_get_seed(const uint8_t *data, size_t size, size_t data_offset, uint32_t seed_out[17])</div><div class="ttdoc">Try to extract the LFG seed from a chunk of data.</div><div class="ttdef"><b>Definition</b> <a href="#l00121">lfg.c:121</a></div></div>
<div class="ttc" id="alfg_8h_html"><div class="ttname"><a href="lfg_8h.html">lfg.h</a></div></div>
<div class="ttc" id="alfg_8h_html_a16edb4e9c0a519cb423979b38d8f132a"><div class="ttname"><a href="lfg_8h.html#a16edb4e9c0a519cb423979b38d8f132a">NGC_LFG_K</a></div><div class="ttdeci">#define NGC_LFG_K</div><div class="ttdoc">LFG buffer size (number of uint32 words in state).</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00034">lfg.h:34</a></div></div>
<div class="ttc" id="alfg_8h_html_a2c4db3d8d295f706dcacc8a4d039beed"><div class="ttname"><a href="lfg_8h.html#a2c4db3d8d295f706dcacc8a4d039beed">NGC_LFG_SEED_SIZE</a></div><div class="ttdeci">#define NGC_LFG_SEED_SIZE</div><div class="ttdoc">Number of uint32 words needed to seed the LFG.</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00036">lfg.h:36</a></div></div>
<div class="ttc" id="alfg_8h_html_a865dc66e4ab8ae46527b88c2c119807a"><div class="ttname"><a href="lfg_8h.html#a865dc66e4ab8ae46527b88c2c119807a">NGC_LFG_J</a></div><div class="ttdeci">#define NGC_LFG_J</div><div class="ttdoc">LFG second tap.</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00035">lfg.h:35</a></div></div>
<div class="ttc" id="astructngc__lfg__ctx_html"><div class="ttname"><a href="structngc__lfg__ctx.html">ngc_lfg_ctx</a></div><div class="ttdoc">LFG context holding the 521-word circular buffer and byte position.</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00041">lfg.h:42</a></div></div>
<div class="ttc" id="astructngc__lfg__ctx_html_a84958bcdb9e96a4231aa4f43d5415eea"><div class="ttname"><a href="structngc__lfg__ctx.html#a84958bcdb9e96a4231aa4f43d5415eea">ngc_lfg_ctx::position_bytes</a></div><div class="ttdeci">size_t position_bytes</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00044">lfg.h:44</a></div></div>
<div class="ttc" id="astructngc__lfg__ctx_html_a9b5c7dbc3b197b77bef259cd8bbb408a"><div class="ttname"><a href="structngc__lfg__ctx.html#a9b5c7dbc3b197b77bef259cd8bbb408a">ngc_lfg_ctx::buffer</a></div><div class="ttdeci">uint32_t buffer[521]</div><div class="ttdef"><b>Definition</b> <a href="lfg_8h_source.html#l00043">lfg.h:43</a></div></div>
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