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<div class="title">crc32.c</div> </div>
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<a href="crc32_8c.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"> * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * code or tables extracted from it, as desired without restriction.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> */</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> <span class="comment">/*</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * First, the polynomial itself and its table of feedback terms. The</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * polynomial is</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Note that we take it "backwards" and put the highest-order term in</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * the lowest-order bit. The X^32 term is "implied"; the LSB is the</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * X^31 term, etc. The X^0 term (usually shown as "+1") results in</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * the MSB being 1</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * Note that the usual hardware shift register implementation, which</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * is what we're using (we're merely optimizing it by doing eight-bit</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * chunks at a time) shifts bits into the lowest-order term. In our</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * implementation, that means shifting towards the right. Why do we</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * do it this way? Because the calculated CRC must be transmitted in</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * order from highest-order term to lowest-order term. UARTs transmit</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * characters in order from LSB to MSB. By storing the CRC this way</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * we hand it to the UART in the order low-byte to high-byte; the UART</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * sends each low-bit to hight-bit; and the result is transmission bit</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * by bit from highest- to lowest-order term without requiring any bit</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * shuffling on our part. Reception works similarly</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * The feedback terms table consists of 256, 32-bit entries. Notes</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * The table can be generated at runtime if desired; code to do so</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * is shown later. It might not be obvious, but the feedback</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * terms simply represent the results of eight shift/xor opera</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * tions for all combinations of data and CRC register values</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * The values must be right-shifted by eight bits by the "updcrc</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * logic; the shift must be unsigned (bring in zeroes). On some</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * hardware you could probably optimize the shift in assembler by</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * using byte-swap instructions</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * polynomial $edb88320</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * CRC32 code derived from work by Gary S. Brown.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">//#include <sys/cdefs.h></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include <<a class="code" href="include_2sys_2types_8h.html">sys/types.h</a>></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include <<a class="code" href="crc32_8h.html">fs/common/crc32.h</a>></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> crc32_tab[] = {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> };</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a></div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="crc32_8h.html#ae1ce21755b99c89f626605a5814419d4"> 97</a></span> <a class="code" href="crc32_8c.html#ae1ce21755b99c89f626605a5814419d4">crc32</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *<a class="code" href="structbuf.html">buf</a>, <span class="keywordtype">size_t</span> size)</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> <a class="code" href="include_2sys_2types_8h.html#ac7c42f52639b9aca7da966a0783996d7">u_int8_t</a> *p = <a class="code" href="structbuf.html">buf</a>;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> crc;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  crc = ~0U;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">while</span> (size--)</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">return</span> (crc ^ ~0U);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> }</div>
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<div class="ttc" id="ainclude_2sys_2types_8h_html"><div class="ttname"><a href="include_2sys_2types_8h.html">types.h</a></div></div>
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