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Constexpr CRC32

Apr 12th, 2017
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  1. #ifndef MATRIXGEN_C_TIME_HASH_H
  2. #define MATRIXGEN_C_TIME_HASH_H
  3.  
  4.  
  5. namespace compiletimehash
  6. {
  7.  
  8.     static constexpr unsigned int crc_table[256] = {
  9.             0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
  10.             0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  11.             0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
  12.             0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  13.             0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  14.             0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  15.             0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
  16.             0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  17.             0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
  18.             0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  19.             0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
  20.             0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  21.             0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
  22.             0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  23.             0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  24.             0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  25.             0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
  26.             0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  27.             0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
  28.             0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  29.             0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
  30.             0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  31.             0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
  32.             0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  33.             0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  34.             0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  35.             0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
  36.             0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  37.             0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
  38.             0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  39.             0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
  40.             0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  41.             0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
  42.             0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  43.             0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  44.             0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  45.             0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
  46.             0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  47.             0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
  48.             0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  49.             0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
  50.             0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  51.             0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
  52.     };
  53.  
  54. // template recursive implementation of crc32 algorithm, necessary before c++11 and older
  55.     template<int size, int idx = 0, class dummy = void>
  56.     struct MM
  57.     {
  58.         static constexpr unsigned int crc32(const char *str, unsigned int prev_crc = 0xFFFFFFFF)
  59.         {
  60.             return MM<size, idx + 1>::crc32(str, (prev_crc >> 8) ^ crc_table[(prev_crc ^ str[idx]) & 0xFF]);
  61.         }
  62.     };
  63. // This is the stop-recursion function
  64.     template<int size, class dummy>
  65.     struct MM<size, size, dummy>
  66.     {
  67.         static constexpr unsigned int crc32(const char *str, unsigned int prev_crc = 0xFFFFFFFF)
  68.         {
  69.             return prev_crc ^ 0xFFFFFFFF;
  70.         }
  71.     };
  72.     /*
  73.      * crc32 string hash algorithm. if the string is known at compile time, the hashed value will be
  74.      * computed during compilation. Otherwise, will be computed at runtime. Require at least std=c++14.
  75.      * @ param str c-style string to be hashed.
  76.      */
  77.     constexpr uint32_t crc32(const char* str)
  78.     {
  79.         uint32_t out = 0xFFFFFFFF;
  80.         uint8_t byte=0;
  81.         uint32_t i= 0;
  82.         while ((byte = str[i]) != 0) {
  83.             out = (out >> 8) ^ crc_table[(out ^ byte) & 0xFF];
  84.             i = i + 1;
  85.         }
  86.  
  87.         return ~out;
  88.     }
  89.  
  90.  
  91. // This don't take into account the nul char
  92. #define COMPILE_TIME_CRC32_STR(x) MM<sizeof(x)-1>::crc32(x)
  93.  
  94. }
  95.  
  96. #endif //MATRIXGEN_C_TIME_HASH_H
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