rdoff/hash.c

   1 /* hash.h     Routines to calculate a CRC32 hash value
   2  *
   3  *   These routines donated to the NASM effort by Graeme Defty.
   4  *
   5  * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
   6  * Julian Hall. All rights reserved. The software is
   7  * redistributable under the license given in the file "LICENSE"
   8  * distributed in the NASM archive.
   9  */
  10
  11 #include "compiler.h"
  12
  13 #include "hash.h"
  14
  15 const uint32_t consttab[] = {
  16     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  17     0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  18     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  19     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  20     0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  21     0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  22     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  23     0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  24     0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  25     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  26     0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  27     0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  28     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  29     0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  30     0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  31     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  32     0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  33     0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  34     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  35     0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  36     0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  37     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  38     0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  39     0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  40     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  41     0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  42     0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  43     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  44     0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  45     0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  46     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  47     0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  48     0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  49     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  50     0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  51     0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  52     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  53     0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  54     0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  55     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  56     0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  57     0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  58     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  59     0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  60     0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  61     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  62     0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
  63     0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  64     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
  65     0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
  66     0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  67     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
  68     0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
  69     0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  70     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
  71     0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
  72     0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  73     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
  74     0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
  75     0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  76     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
  77     0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
  78     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  79     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
  80 };
  81
  82 uint32_t hash(const char *name)
  83 {
  84     register const char *n;
  85     register uint32_t hashval = 0xffffffff;
  86
  87     for (n = name; *n; n++)
  88         hashval = (hashval >> 8) ^ consttab[(hashval ^ *n) & 0xff];
  89
  90     hashval ^= 0xffffffff;
  91
  92     return hashval;
  93 }