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170 lines
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<div id="projectname">DNA Calib<span id="projectnumber"> 1.1</span>
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<li class="navelem"><a class="el" href="dir_152a494004de7bf5f5699139fd63e08c.html">dnacalib</a></li><li class="navelem"><a class="el" href="dir_e342cf579e4a20e61ca12fdabd8b8b30.html">DNACalib</a></li><li class="navelem"><a class="el" href="dir_ebe8ed350d62118184cb59aefa6eec76.html">src</a></li><li class="navelem"><a class="el" href="dir_1567b1af89f37b26e4a41df1e9e5445f.html">terse</a></li><li class="navelem"><a class="el" href="dir_c7358d34e7e56e544dab2a15cb185bfa.html">utils</a></li> </ul>
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<div class="headertitle"><div class="title">Base64.h</div></div>
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<a href="Base64_8h.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">// Copyright Epic Games, Inc. All Rights Reserved.</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor"> #pragma warning(push)</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor"> #pragma warning(disable : 4365 4987)</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#endif</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor"> #pragma warning(pop)</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#endif</span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceterse.html">terse</a> {</div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"><a class="line" href="namespaceterse.html#a531730fa214562c2563371e25ab143ec"> 17</a></span><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code hl_variable" href="namespaceterse.html#a531730fa214562c2563371e25ab143ec">alphabet</a> = <span class="stringliteral">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"</span>;</div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"><a class="line" href="namespaceterse.html#a86f9ab8fb558bf7219b4ee1d04f7bba9"> 19</a></span><span class="keyword">constexpr</span> std::size_t <a class="code hl_function" href="namespaceterse.html#a86f9ab8fb558bf7219b4ee1d04f7bba9">base64encode</a>(std::size_t size) {</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="keywordflow">return</span> ((4ul * size / 3ul) + 3ul) & ~3ul;</div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span>}</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">// destination should be of length ((4 * size / 3) + 3) & ~3</span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="namespaceterse.html#a07d89bdf9c5159cad6c7c85798d26909"> 24</a></span><span class="keyword">inline</span> std::size_t <a class="code hl_function" href="namespaceterse.html#a86f9ab8fb558bf7219b4ee1d04f7bba9">base64encode</a>(<span class="keywordtype">char</span>* destination, <span class="keyword">const</span> <span class="keywordtype">char</span>* source, std::size_t size) {</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="keywordtype">char</span>* out = destination;</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordtype">int</span> val = 0;</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">int</span> valb = -6;</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">for</span> (std::size_t pos = {}; pos < size; ++pos) {</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">const</span> <span class="keyword">auto</span> c = <span class="keyword">static_cast<</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span><span class="keyword">></span>(source[pos]);</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> val = (val << 8) + c;</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> valb += 8;</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">while</span> (valb >= 0) {</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> *out++ = (<a class="code hl_variable" href="namespaceterse.html#a531730fa214562c2563371e25ab143ec">alphabet</a>[(val >> valb) & 0x3F]);</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> valb -= 6;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> }</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> }</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">if</span> (valb > -6) {</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> *out++ = <a class="code hl_variable" href="namespaceterse.html#a531730fa214562c2563371e25ab143ec">alphabet</a>[((val << 8) >> (valb + 8)) & 0x3F];</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">while</span> (<span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(out - destination) % 4) {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> *out++ = <span class="charliteral">'='</span>;</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> }</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// Length of base64encoded data</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(out - destination);</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>}</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"><a class="line" href="namespaceterse.html#a8463eac7d23e67677dcd94074404dc09"> 52</a></span><span class="keyword">constexpr</span> std::size_t <a class="code hl_function" href="namespaceterse.html#a8463eac7d23e67677dcd94074404dc09">base64decode</a>(std::size_t size) {</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordflow">return</span> (size * 3ul) / 4ul;</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>}</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">// destination should be of length (size / 4) * 3</span></div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"><a class="line" href="namespaceterse.html#a69dc9ab0e111e3adbcbe073b48cfbe29"> 57</a></span><span class="keyword">inline</span> std::size_t <a class="code hl_function" href="namespaceterse.html#a8463eac7d23e67677dcd94074404dc09">base64decode</a>(<span class="keywordtype">char</span>* destination, <span class="keyword">const</span> <span class="keywordtype">char</span>* source, std::size_t size) {</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordtype">char</span>* out = destination;</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">int</span> buffer[256];</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> std::fill_n(buffer, 256, -1);</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 64; i++) {</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> buffer[<span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(<a class="code hl_variable" href="namespaceterse.html#a531730fa214562c2563371e25ab143ec">alphabet</a>[i])] = i;</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordtype">int</span> val = 0;</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordtype">int</span> valb = -8;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">for</span> (std::size_t pos = {}; pos < size; ++pos) {</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">const</span> <span class="keyword">auto</span> c = <span class="keyword">static_cast<</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span><span class="keyword">></span>(source[pos]);</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keywordflow">if</span> (buffer[c] == -1) {</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> }</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> val = (val << 6) + buffer[c];</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> valb += 6;</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="keywordflow">if</span> (valb >= 0) {</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> *out++ = <span class="keyword">static_cast<</span><span class="keywordtype">char</span><span class="keyword">></span>((val >> valb) & 0xFF);</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> valb -= 8;</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> }</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> }</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// Length of base64decoded data</span></div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(out - destination);</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span>}</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span>} <span class="comment">// namespace terse</span></div>
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<div class="ttc" id="anamespaceterse_html"><div class="ttname"><a href="namespaceterse.html">terse</a></div><div class="ttdef"><b>Definition:</b> Archive.h:14</div></div>
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<div class="ttc" id="anamespaceterse_html_a531730fa214562c2563371e25ab143ec"><div class="ttname"><a href="namespaceterse.html#a531730fa214562c2563371e25ab143ec">terse::alphabet</a></div><div class="ttdeci">static const char * alphabet</div><div class="ttdef"><b>Definition:</b> Base64.h:17</div></div>
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<div class="ttc" id="anamespaceterse_html_a8463eac7d23e67677dcd94074404dc09"><div class="ttname"><a href="namespaceterse.html#a8463eac7d23e67677dcd94074404dc09">terse::base64decode</a></div><div class="ttdeci">constexpr std::size_t base64decode(std::size_t size)</div><div class="ttdef"><b>Definition:</b> Base64.h:52</div></div>
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<div class="ttc" id="anamespaceterse_html_a86f9ab8fb558bf7219b4ee1d04f7bba9"><div class="ttname"><a href="namespaceterse.html#a86f9ab8fb558bf7219b4ee1d04f7bba9">terse::base64encode</a></div><div class="ttdeci">constexpr std::size_t base64encode(std::size_t size)</div><div class="ttdef"><b>Definition:</b> Base64.h:19</div></div>
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