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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<div class="title">zlib.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">// zlib.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="comment">// "zlib" is the name of a well known C language compression library</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// (http://www.zlib.org) and also the name of a compression format</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// (RFC 1950) that the library implements. This file is part of a</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// complete reimplementation of the zlib compression format.</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "zlib.h"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "<a class="code" href="zdeflate_8h.html">zdeflate.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "zinflate.h"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "<a class="code" href="secblock_8h.html">secblock.h</a>"</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">static</span> <span class="keyword">const</span> byte DEFLATE_METHOD = 8;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">static</span> <span class="keyword">const</span> byte FDICT_FLAG = (1 << 5);</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> <span class="comment">// *************************************************************</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keywordtype">void</span> ZlibCompressor::WritePrestreamHeader()</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  m_adler32.<a class="code" href="class_hash_transformation.html#a92752eebac10497211d7a065faba8725">Restart</a>();</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <a class="code" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a>(((<a class="code" href="class_deflator.html#afeb0772f4acedb703c1c794d238d6de2">GetLog2WindowSize</a>()-8) << 4) <= 255);</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  byte cmf = byte(DEFLATE_METHOD | ((<a class="code" href="class_deflator.html#afeb0772f4acedb703c1c794d238d6de2">GetLog2WindowSize</a>()-8) << 4));</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <a class="code" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a>((GetCompressionLevel() << 6) <= 255);</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  byte flags = byte(GetCompressionLevel() << 6);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <a class="code" href="class_filter.html#ac8fc888888b2dad88bf64fc703044a93">AttachedTransformation</a>()-><a class="code" href="class_buffered_transformation.html#a92c60616792d7bce5cd41eaffbd1c3cc">PutWord16</a>(<a class="code" href="misc_8h.html#a57a219d44f45272a1f3b3f17a656000a">RoundUpToMultipleOf</a>(word16(cmf*256+flags), word16(31)));</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> }</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> <span class="keywordtype">void</span> ZlibCompressor::ProcessUncompressedData(<span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  m_adler32.<a class="code" href="class_adler32.html#a84c3d47f039beab76b5f902ff558ac49">Update</a>(inString, length);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> }</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keywordtype">void</span> ZlibCompressor::WritePoststreamTail()</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<byte, 4></a> adler32;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  m_adler32.<a class="code" href="class_hash_transformation.html#aa0b8c7a110d8968268fd02ec32b9a8e8">Final</a>(adler32);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <a class="code" href="class_filter.html#ac8fc888888b2dad88bf64fc703044a93">AttachedTransformation</a>()-><a class="code" href="class_buffered_transformation.html#ae70658b0d271f8e114ac6c3cc9774ede">Put</a>(adler32, 4);</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</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="keywordtype">unsigned</span> <span class="keywordtype">int</span> ZlibCompressor::GetCompressionLevel()<span class="keyword"> const</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword"></span>{</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> deflateToCompressionLevel[] = {0, 1, 1, 1, 2, 2, 2, 2, 2, 3};</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> deflateToCompressionLevel[<a class="code" href="class_deflator.html#ad2ecf9c16317cef8b68fbbcca705e0a4">GetDeflateLevel</a>()];</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> <span class="comment">// *************************************************************</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="class_zlib_decompressor.html#a2811c881df0f9cd29a8a047c12c3a744"> 51</a></span> <a class="code" href="class_zlib_decompressor.html#a2811c881df0f9cd29a8a047c12c3a744">ZlibDecompressor::ZlibDecompressor</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> *attachment, <span class="keywordtype">bool</span> repeat, <span class="keywordtype">int</span> propagation)</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  : <a class="code" href="class_inflator.html">Inflator</a>(attachment, repeat, propagation), m_log2WindowSize(0)</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> {</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"> 56</span> <span class="keywordtype">void</span> ZlibDecompressor::ProcessPrestreamHeader()</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>  m_adler32.<a class="code" href="class_hash_transformation.html#a92752eebac10497211d7a065faba8725">Restart</a>();</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>  byte cmf;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  byte flags;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (!m_inQueue.Get(cmf) || !m_inQueue.Get(flags))</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">throw</span> HeaderErr();</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> ((cmf*256+flags) % 31 != 0)</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">throw</span> HeaderErr(); <span class="comment">// if you hit this exception, you're probably trying to decompress invalid data</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> ((cmf & 0xf) != DEFLATE_METHOD)</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">throw</span> UnsupportedAlgorithm();</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (flags & FDICT_FLAG)</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">throw</span> UnsupportedPresetDictionary();</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  m_log2WindowSize = 8 + (cmf >> 4);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</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> <span class="keywordtype">void</span> ZlibDecompressor::ProcessDecompressedData(<span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length)</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> {</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <a class="code" href="class_filter.html#ac8fc888888b2dad88bf64fc703044a93">AttachedTransformation</a>()-><a class="code" href="class_buffered_transformation.html#ae70658b0d271f8e114ac6c3cc9774ede">Put</a>(inString, length);</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  m_adler32.<a class="code" href="class_adler32.html#a84c3d47f039beab76b5f902ff558ac49">Update</a>(inString, length);</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="keywordtype">void</span> ZlibDecompressor::ProcessPoststreamTail()</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<byte, 4></a> adler32;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (m_inQueue.Get(adler32, 4) != 4)</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">throw</span> Adler32Err();</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (!m_adler32.<a class="code" href="class_hash_transformation.html#a16c4aecd047015d513feef4ed5b929ba">Verify</a>(adler32))</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">throw</span> Adler32Err();</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> NAMESPACE_END</div><div class="ttc" id="class_zlib_decompressor_html_a2811c881df0f9cd29a8a047c12c3a744"><div class="ttname"><a href="class_zlib_decompressor.html#a2811c881df0f9cd29a8a047c12c3a744">ZlibDecompressor::ZlibDecompressor</a></div><div class="ttdeci">ZlibDecompressor(BufferedTransformation *attachment=NULL, bool repeat=false, int autoSignalPropagation=-1)</div><div class="ttdoc">Construct a ZlibDecompressor. </div><div class="ttdef"><b>Definition:</b> <a href="zlib_8cpp_source.html#l00051">zlib.cpp:51</a></div></div>
<div class="ttc" id="class_buffered_transformation_html"><div class="ttname"><a href="class_buffered_transformation.html">BufferedTransformation</a></div><div class="ttdoc">Interface for buffered transformations. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01545">cryptlib.h:1545</a></div></div>
<div class="ttc" id="zdeflate_8h_html"><div class="ttname"><a href="zdeflate_8h.html">zdeflate.h</a></div><div class="ttdoc">DEFLATE compression and decompression (RFC 1951) </div></div>
<div class="ttc" id="secblock_8h_html"><div class="ttname"><a href="secblock_8h.html">secblock.h</a></div><div class="ttdoc">Classes and functions for secure memory allocations. </div></div>
<div class="ttc" id="class_buffered_transformation_html_ae70658b0d271f8e114ac6c3cc9774ede"><div class="ttname"><a href="class_buffered_transformation.html#ae70658b0d271f8e114ac6c3cc9774ede">BufferedTransformation::Put</a></div><div class="ttdeci">size_t Put(byte inByte, bool blocking=true)</div><div class="ttdoc">Input a byte for processing. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01567">cryptlib.h:1567</a></div></div>
<div class="ttc" id="class_hash_transformation_html_a92752eebac10497211d7a065faba8725"><div class="ttname"><a href="class_hash_transformation.html#a92752eebac10497211d7a065faba8725">HashTransformation::Restart</a></div><div class="ttdeci">virtual void Restart()</div><div class="ttdoc">Restart the hash. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01100">cryptlib.h:1100</a></div></div>
<div class="ttc" id="class_filter_html_ac8fc888888b2dad88bf64fc703044a93"><div class="ttname"><a href="class_filter.html#ac8fc888888b2dad88bf64fc703044a93">Filter::AttachedTransformation</a></div><div class="ttdeci">BufferedTransformation * AttachedTransformation()</div><div class="ttdoc">Retrieve attached transformation. </div><div class="ttdef"><b>Definition:</b> <a href="filters_8cpp_source.html#l00036">filters.cpp:36</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="class_adler32_html_a84c3d47f039beab76b5f902ff558ac49"><div class="ttname"><a href="class_adler32.html#a84c3d47f039beab76b5f902ff558ac49">Adler32::Update</a></div><div class="ttdeci">void Update(const byte *input, size_t length)</div><div class="ttdoc">Updates a hash with additional input. </div><div class="ttdef"><b>Definition:</b> <a href="adler32_8cpp_source.html#l00008">adler32.cpp:8</a></div></div>
<div class="ttc" id="class_fixed_size_sec_block_html"><div class="ttname"><a href="class_fixed_size_sec_block.html">FixedSizeSecBlock</a></div><div class="ttdoc">Fixed size stack-based SecBlock. </div><div class="ttdef"><b>Definition:</b> <a href="secblock_8h_source.html#l00841">secblock.h:841</a></div></div>
<div class="ttc" id="class_hash_transformation_html_a16c4aecd047015d513feef4ed5b929ba"><div class="ttname"><a href="class_hash_transformation.html#a16c4aecd047015d513feef4ed5b929ba">HashTransformation::Verify</a></div><div class="ttdeci">virtual bool Verify(const byte *digest)</div><div class="ttdoc">Verifies the hash of the current message. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01151">cryptlib.h:1151</a></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="class_deflator_html_afeb0772f4acedb703c1c794d238d6de2"><div class="ttname"><a href="class_deflator.html#afeb0772f4acedb703c1c794d238d6de2">Deflator::GetLog2WindowSize</a></div><div class="ttdeci">int GetLog2WindowSize() const</div><div class="ttdoc">Retrieves the window size. </div><div class="ttdef"><b>Definition:</b> <a href="zdeflate_8h_source.html#l00122">zdeflate.h:122</a></div></div>
<div class="ttc" id="class_inflator_html"><div class="ttname"><a href="class_inflator.html">Inflator</a></div><div class="ttdoc">DEFLATE decompressor (RFC 1951) </div><div class="ttdef"><b>Definition:</b> <a href="zinflate_8h_source.html#l00089">zinflate.h:89</a></div></div>
<div class="ttc" id="class_deflator_html_ad2ecf9c16317cef8b68fbbcca705e0a4"><div class="ttname"><a href="class_deflator.html#ad2ecf9c16317cef8b68fbbcca705e0a4">Deflator::GetDeflateLevel</a></div><div class="ttdeci">int GetDeflateLevel() const</div><div class="ttdoc">Retrieves the deflation level. </div><div class="ttdef"><b>Definition:</b> <a href="zdeflate_8h_source.html#l00118">zdeflate.h:118</a></div></div>
<div class="ttc" id="class_buffered_transformation_html_a92c60616792d7bce5cd41eaffbd1c3cc"><div class="ttname"><a href="class_buffered_transformation.html#a92c60616792d7bce5cd41eaffbd1c3cc">BufferedTransformation::PutWord16</a></div><div class="ttdeci">size_t PutWord16(word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)</div><div class="ttdoc">Input a 16-bit word for processing. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00751">cryptlib.cpp:751</a></div></div>
<div class="ttc" id="misc_8h_html_a57a219d44f45272a1f3b3f17a656000a"><div class="ttname"><a href="misc_8h.html#a57a219d44f45272a1f3b3f17a656000a">RoundUpToMultipleOf</a></div><div class="ttdeci">T1 RoundUpToMultipleOf(const T1 &n, const T2 &m)</div><div class="ttdoc">Rounds a value up to a multiple of a second value. </div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00971">misc.h:971</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>
<div class="ttc" id="class_hash_transformation_html_aa0b8c7a110d8968268fd02ec32b9a8e8"><div class="ttname"><a href="class_hash_transformation.html#aa0b8c7a110d8968268fd02ec32b9a8e8">HashTransformation::Final</a></div><div class="ttdeci">virtual void Final(byte *digest)</div><div class="ttdoc">Computes the hash of the current message. </div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01095">cryptlib.h:1095</a></div></div>
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