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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<div class="title">adler32.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// adler32.cpp - originally written and placed in the public domain by Wei Dai</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include "<a class="code" href="adler32_8h.html">adler32.h</a>"</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"><a class="line" href="class_adler32.html#a84c3d47f039beab76b5f902ff558ac49"> 8</a></span> void <a class="code" href="class_adler32.html">Adler32</a>::Update(const byte *input, <span class="keywordtype">size_t</span> length)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> {</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> BASE = 65521;</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> s1 = m_s1;</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> s2 = m_s2;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  <span class="keywordflow">if</span> (length % 8 != 0)</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  {</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  s1 += *input++;</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  s2 += s1;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  length--;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  } <span class="keywordflow">while</span> (length % 8 != 0);</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">if</span> (s1 >= BASE)</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  s1 -= BASE;</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  s2 %= BASE;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  }</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">while</span> (length > 0)</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  s1 += input[0]; s2 += s1;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  s1 += input[1]; s2 += s1;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  s1 += input[2]; s2 += s1;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  s1 += input[3]; s2 += s1;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  s1 += input[4]; s2 += s1;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  s1 += input[5]; s2 += s1;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  s1 += input[6]; s2 += s1;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  s1 += input[7]; s2 += s1;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  length -= 8;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  input += 8;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (s1 >= BASE)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  s1 -= BASE;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (length % 0x8000 == 0)</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  s2 %= BASE;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <a class="code" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a>(s1 < BASE);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <a class="code" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a>(s2 < BASE);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  m_s1 = (word16)s1;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  m_s2 = (word16)s2;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="class_adler32.html#ae6c17afdf6aeb8b58d771932551b07fa"> 56</a></span> <span class="keywordtype">void</span> <a class="code" href="class_adler32.html#ae6c17afdf6aeb8b58d771932551b07fa">Adler32::TruncatedFinal</a>(byte *hash, <span class="keywordtype">size_t</span> size)</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  ThrowIfInvalidTruncatedSize(size);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">switch</span> (size)</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  {</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  hash[3] = byte(m_s1);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// fall through</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">case</span> 3:</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  hash[2] = byte(m_s1 >> 8);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// fall through</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  hash[1] = byte(m_s2);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// fall through</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">case</span> 1:</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  hash[0] = byte(m_s2 >> 8);</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// fall through</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  ;;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// fall through</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  Reset();</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> NAMESPACE_END</div><div class="ttc" id="class_adler32_html_ae6c17afdf6aeb8b58d771932551b07fa"><div class="ttname"><a href="class_adler32.html#ae6c17afdf6aeb8b58d771932551b07fa">Adler32::TruncatedFinal</a></div><div class="ttdeci">void TruncatedFinal(byte *hash, size_t size)</div><div class="ttdoc">Computes the hash of the current message. </div><div class="ttdef"><b>Definition:</b> <a href="adler32_8cpp_source.html#l00056">adler32.cpp:56</a></div></div>
<div class="ttc" id="class_adler32_html"><div class="ttname"><a href="class_adler32.html">Adler32</a></div><div class="ttdoc">ADLER-32 checksum calculations. </div><div class="ttdef"><b>Definition:</b> <a href="adler32_8h_source.html#l00014">adler32.h:14</a></div></div>
<div class="ttc" id="pch_8h_html"><div class="ttname"><a href="pch_8h.html">pch.h</a></div><div class="ttdoc">Precompiled header file. </div></div>
<div class="ttc" id="adler32_8h_html"><div class="ttname"><a href="adler32_8h.html">adler32.h</a></div><div class="ttdoc">Class file for ADLER-32 checksum calculations. </div></div>
<div class="ttc" id="trap_8h_html_adf3b392588bc94cbeae9f415a78c7b95"><div class="ttname"><a href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a></div><div class="ttdeci">#define CRYPTOPP_ASSERT(exp)</div><div class="ttdoc">Debugging and diagnostic assertion. </div><div class="ttdef"><b>Definition:</b> <a href="trap_8h_source.html#l00060">trap.h:60</a></div></div>
<div class="ttc" id="namespace_crypto_p_p_html"><div class="ttname"><a href="namespace_crypto_p_p.html">CryptoPP</a></div><div class="ttdoc">Crypto++ library namespace. </div></div>
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