rdoff/hash.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
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  10  *
  11  *   * Redistributions of source code must retain the above copyright
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  33
  34 /*
  35  * hash.h     Routines to calculate a CRC32 hash value
  36  *
  37  *   These routines donated to the NASM effort by Graeme Defty.
  38  */
  39
  40 #include "compiler.h"
  41
  42 #include "hash.h"
  43
  44 const uint32_t consttab[] = {
  45     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  46     0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  47     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  48     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  49     0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  50     0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  51     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  52     0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  53     0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  54     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  55     0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  56     0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  57     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  58     0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  59     0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  60     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  61     0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  62     0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  63     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  64     0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  65     0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  66     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  67     0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  68     0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  69     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  70     0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  71     0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  72     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  73     0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  74     0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  75     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  76     0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  77     0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  78     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  79     0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  80     0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  81     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  82     0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  83     0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  84     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  85     0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  86     0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  87     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  88     0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  89     0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  90     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  91     0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
  92     0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  93     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
  94     0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
  95     0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  96     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
  97     0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
  98     0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  99     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
 100     0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
 101     0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
 102     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
 103     0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
 104     0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
 105     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
 106     0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
 107     0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
 108     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
 109 };
 110
 111 uint32_t hash(const char *name)
 112 {
 113     register const char *n;
 114     register uint32_t hashval = 0xffffffff;
 115
 116     for (n = name; *n; n++)
 117         hashval = (hashval >> 8) ^ consttab[(hashval ^ *n) & 0xff];
 118
 119     hashval ^= 0xffffffff;
 120
 121     return hashval;
 122 }