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<div class="textblock"><code>#include &quot;<a class="el" href="../../db/d45/_data_compressor_8h_source.xhtml">slikenet/DataCompressor.h</a>&quot;</code><br/>
<code>#include &quot;<a class="el" href="../../de/d78/_d_s___huffman_encoding_tree_8h_source.xhtml">slikenet/DS_HuffmanEncodingTree.h</a>&quot;</code><br/>
<code>#include &quot;<a class="el" href="../../dc/da7/assert_8h_source.xhtml">slikenet/assert.h</a>&quot;</code><br/>
<code>#include &lt;<a class="el" href="../../da/d66/string_8h_source.xhtml">string.h</a>&gt;</code><br/>
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<a href="../../d7/dbe/_data_compressor_8cpp.xhtml">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Original work: Copyright (c) 2014, Oculus VR, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * This source code is licensed under the BSD-style license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * RakNet License.txt file in the licenses directory of this source tree. An additional grant </span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * of patent rights can be found in the RakNet Patents.txt file in the same directory.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * Modified work: Copyright (c) 2017, SLikeSoft UG (haftungsbeschränkt)</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * This source code was modified by SLikeSoft. Modifications are licensed under the MIT-style</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * license found in the license.txt file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="../../db/d45/_data_compressor_8h.xhtml" title="DataCompressor does compression on a block of data.">slikenet/DataCompressor.h</a>&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="../../de/d78/_d_s___huffman_encoding_tree_8h.xhtml" title="[Internal] Generates a huffman encoding tree, used for string and global compression.">slikenet/DS_HuffmanEncodingTree.h</a>&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="../../dc/da7/assert_8h.xhtml">slikenet/assert.h</a>&quot;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="../../da/d66/string_8h.xhtml">string.h</a>&gt;</span> <span class="comment">// Use string.h rather than memory.h for a console</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">using namespace </span>SLNet;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<a class="code" href="../../db/dbd/_export_8h.xhtml#aa00165c970bdb25e1c757b432509533b">STATIC_FACTORY_DEFINITIONS</a>(<a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml" title="Does compression on a block of data. Not very good compression, but it&#39;s small and fast so is somethi...">DataCompressor</a>,<a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml" title="Does compression on a block of data. Not very good compression, but it&#39;s small and fast so is somethi...">DataCompressor</a>)</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml#af18a75451d79cf052cf9715ff8968de8"> 25</a></span>&#160;void <a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml" title="Does compression on a block of data. Not very good compression, but it&#39;s small and fast so is somethi...">DataCompressor</a>::Compress( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *userData, <span class="keywordtype">unsigned</span> sizeInBytes, SLNet::<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml">BitStream</a> * output )</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;{</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="comment">// Don&#39;t use this for small files as you will just make them bigger!</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; <a class="code" href="../../d8/db0/defines_8h.xhtml#afaa3647d29f5960651eb23fd3d2b5368">RakAssert</a>(sizeInBytes &gt; 2048);</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> frequencyTable[ 256 ];</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; memset(frequencyTable,0,256*<span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>));</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordflow">for</span> (i=0; i &lt; sizeInBytes; i++)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; ++frequencyTable[userData[i]];</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml" title="This generates special cases of the huffman encoding tree using 8 bit keys with the additional condit...">HuffmanEncodingTree</a> tree;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <a class="code" href="../../dd/d30/namespace_s_l_net.xhtml#a227d2a5f9683a34d9d1e70772fd556ec">BitSize_t</a> writeOffset1, writeOffset2, bitsUsed1, bitsUsed2;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; tree.<a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml#abde050a1b4a2128ec3896463f9f997a7" title="Given a frequency table of 256 elements, all with a frequency of 1 or more, generate the tree...">GenerateFromFrequencyTable</a>(frequencyTable);</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; output-&gt;WriteCompressed(sizeInBytes);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordflow">for</span> (i=0; i &lt; 256; i++)</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; output-&gt;WriteCompressed(frequencyTable[i]);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; output-&gt;AlignWriteToByteBoundary();</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; writeOffset1=output-&gt;GetWriteOffset();</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; output-&gt;Write((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)0); <span class="comment">// Dummy value</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; bitsUsed1=output-&gt;GetNumberOfBitsUsed();</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; tree.<a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml#a1d35c9afb94d954f184a72cf904c7c65" title="Pass an array of bytes to array and a preallocated BitStream to receive the output.">EncodeArray</a>(userData, sizeInBytes, output);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; bitsUsed2=output-&gt;GetNumberOfBitsUsed();</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; writeOffset2=output-&gt;GetWriteOffset();</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; output-&gt;SetWriteOffset(writeOffset1);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; output-&gt;Write(bitsUsed2-bitsUsed1); <span class="comment">// Go back and write how many bits were used for the encoding</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; output-&gt;SetWriteOffset(writeOffset2);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;}</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml#ae6c868e1af182b327011b9e795928143"> 53</a></span>&#160;<span class="keywordtype">unsigned</span> <a class="code" href="../../da/d5f/class_s_l_net_1_1_data_compressor.xhtml#ae6c868e1af182b327011b9e795928143">DataCompressor::DecompressAndAllocate</a>(<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml">SLNet::BitStream</a> * input, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **output )</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;{</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml" title="This generates special cases of the huffman encoding tree using 8 bit keys with the additional condit...">HuffmanEncodingTree</a> tree;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> bitsUsed, destinationSizeInBytes;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> decompressedBytes;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> frequencyTable[ 256 ];</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordtype">unsigned</span> i;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; input-&gt;<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml#ac7fcbda7a05b5c7bd7018205cb1bb7b0" title="Read any integral type from a bitstream.">ReadCompressed</a>(destinationSizeInBytes);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordflow">for</span> (i=0; i &lt; 256; i++)</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; input-&gt;<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml#ac7fcbda7a05b5c7bd7018205cb1bb7b0" title="Read any integral type from a bitstream.">ReadCompressed</a>(frequencyTable[i]);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; input-&gt;<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml#af64b3663a865840e013f5aef490d891e" title="Align the next write and/or read to a byte boundary.">AlignReadToByteBoundary</a>();</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">if</span> (input-&gt;<a class="code" href="../../df/d75/class_s_l_net_1_1_bit_stream.xhtml#a59f38126d8d19bfd264a2e2cace7d1db" title="Read any integral type from a bitstream.">Read</a>(bitsUsed)==<span class="keyword">false</span>)</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">// Read error</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="preprocessor">#ifdef _DEBUG</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;<span class="preprocessor"></span> <a class="code" href="../../d8/db0/defines_8h.xhtml#afaa3647d29f5960651eb23fd3d2b5368">RakAssert</a>(0);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="preprocessor"></span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; *output = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*) <a class="code" href="../../d9/d4c/_rak_memory_override_8cpp.xhtml#aebeb2e4754399ea3e2c7af3dd9bbe8c3">rakMalloc_Ex</a>(destinationSizeInBytes, <a class="code" href="../../d8/db0/defines_8h.xhtml#a8661ec2137eef33a8cd0cd618a748871">_FILE_AND_LINE_</a>);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; tree.<a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml#abde050a1b4a2128ec3896463f9f997a7" title="Given a frequency table of 256 elements, all with a frequency of 1 or more, generate the tree...">GenerateFromFrequencyTable</a>(frequencyTable);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; decompressedBytes=tree.<a class="code" href="../../d6/d52/class_s_l_net_1_1_huffman_encoding_tree.xhtml#a7e1d71fee40cae1bf30526950323425b">DecodeArray</a>(input, bitsUsed, destinationSizeInBytes, *output );</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <a class="code" href="../../d8/db0/defines_8h.xhtml#afaa3647d29f5960651eb23fd3d2b5368">RakAssert</a>(decompressedBytes==destinationSizeInBytes);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordflow">return</span> destinationSizeInBytes;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;}</div>
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