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<a href="varint_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2015, Google Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modification, are permitted provided that the following conditions are</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * * Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * * Redistributions in binary form must reproduce the above</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * copyright notice, this list of conditions and the following disclaimer</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * in the documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * distribution.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * * Neither the name of Google Inc. nor the names of its</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * this software without specific prior written permission.</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> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#ifndef GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"></span><span class="preprocessor">#define GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <<a class="code" href="port__platform_8h.html">grpc/support/port_platform.h</a>></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">/* Helpers for hpack varint encoding */</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">/* length of a value that needs varint tail encoding (it's bigger than can be</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> bitpacked into the opcode byte) - returned value includes the length of the</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> opcode byte */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keywordtype">int</span> <a class="code" href="varint_8h.html#a2b4567fce80183246809231da7d798dc">grpc_chttp2_hpack_varint_length</a>(<a class="code" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> tail_value);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="keywordtype">void</span> <a class="code" href="varint_8h.html#a7fcc1174a3686feebdb7085e30283a66">grpc_chttp2_hpack_write_varint_tail</a>(<a class="code" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> tail_value,</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <a class="code" href="port__platform_8h.html#aeeb41e29e7c7a916a4e0fb6cfb9f92e0">gpr_uint8</a>* target, <span class="keywordtype">int</span> tail_length);</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">/* maximum value that can be bitpacked with the opcode if the opcode has a</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> prefix</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> of length prefix_bits */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="varint_8h.html#a13810a2894d0705c3f1b6fd462f567bd"> 52</a></span> <span class="preprocessor">#define GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits) ((1 << (8 - (prefix_bits))) - 1)</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">/* length required to bitpack a value */</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="varint_8h.html#af09078f363c97757f6e7bfa3953cb93d"> 55</a></span> <span class="preprocessor">#define GRPC_CHTTP2_VARINT_LENGTH(n, prefix_bits) \</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor"> ((n) < GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits) \</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor"> ? 1 \</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"> : grpc_chttp2_hpack_varint_length( \</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"> (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits)))</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="varint_8h.html#a6f5350a7ba20095c1c903463e74b8e54"> 61</a></span> <span class="preprocessor">#define GRPC_CHTTP2_WRITE_VARINT(n, prefix_bits, prefix_or, target, length) \</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"> do { \</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor"> gpr_uint8* tgt = target; \</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor"> if ((length) == 1) { \</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor"> (tgt)[0] = (prefix_or) | (n); \</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor"> } else { \</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor"> (tgt)[0] = (prefix_or) | GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits); \</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor"> grpc_chttp2_hpack_write_varint_tail( \</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor"> (n)-GRPC_CHTTP2_MAX_IN_PREFIX(prefix_bits), (tgt) + 1, (length)-1); \</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor"> } \</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor"> } while (0)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#endif </span><span class="comment">/* GRPC_INTERNAL_CORE_TRANSPORT_CHTTP2_VARINT_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="port__platform_8h_html"><div class="ttname"><a href="port__platform_8h.html">port_platform.h</a></div></div>
<div class="ttc" id="port__platform_8h_html_aeeb41e29e7c7a916a4e0fb6cfb9f92e0"><div class="ttname"><a href="port__platform_8h.html#aeeb41e29e7c7a916a4e0fb6cfb9f92e0">gpr_uint8</a></div><div class="ttdeci">uint8_t gpr_uint8</div><div class="ttdef"><b>Definition:</b> port_platform.h:310</div></div>
<div class="ttc" id="varint_8h_html_a2b4567fce80183246809231da7d798dc"><div class="ttname"><a href="varint_8h.html#a2b4567fce80183246809231da7d798dc">grpc_chttp2_hpack_varint_length</a></div><div class="ttdeci">int grpc_chttp2_hpack_varint_length(gpr_uint32 tail_value)</div><div class="ttdef"><b>Definition:</b> varint.c:36</div></div>
<div class="ttc" id="port__platform_8h_html_aa6abd4df815a5498d1a04b5e691a74a9"><div class="ttname"><a href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a></div><div class="ttdeci">uint32_t gpr_uint32</div><div class="ttdef"><b>Definition:</b> port_platform.h:312</div></div>
<div class="ttc" id="varint_8h_html_a7fcc1174a3686feebdb7085e30283a66"><div class="ttname"><a href="varint_8h.html#a7fcc1174a3686feebdb7085e30283a66">grpc_chttp2_hpack_write_varint_tail</a></div><div class="ttdeci">void grpc_chttp2_hpack_write_varint_tail(gpr_uint32 tail_value, gpr_uint8 *target, int tail_length)</div><div class="ttdef"><b>Definition:</b> varint.c:50</div></div>
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