sbin/hammer2/icrc.c

   1 /*-
   2  * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27 /*
  28  | iSCSI
  29  | $Id: isc_subr.c 560 2009-05-07 07:37:49Z danny $
  30  */
  31
  32 #include <sys/types.h>
  33
  34 #include "hammer2.h"
  35
  36 /*****************************************************************/
  37 /*                                                               */
  38 /* CRC LOOKUP TABLE                                              */
  39 /* ================                                              */
  40 /* The following CRC lookup table was generated automagically    */
  41 /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
  42 /* Program V1.0 using the following model parameters:            */
  43 /*                                                               */
  44 /*    Width   : 4 bytes.                                         */
  45 /*    Poly    : 0x1EDC6F41L                                      */
  46 /*    Reverse : TRUE.                                            */
  47 /*                                                               */
  48 /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
  49 /* see the document titled "A Painless Guide to CRC Error        */
  50 /* Detection Algorithms" by Ross Williams                        */
  51 /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
  52 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
  53 /*                                                               */
  54 /*****************************************************************/
  55
  56 static const uint32_t crc32Table[256] = {
  57     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
  58     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
  59     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
  60     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
  61     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
  62     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
  63     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
  64     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
  65     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
  66     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
  67     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
  68     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
  69     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
  70     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
  71     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
  72     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
  73     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
  74     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
  75     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
  76     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
  77     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
  78     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
  79     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
  80     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
  81     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
  82     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
  83     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
  84     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
  85     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
  86     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
  87     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
  88     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
  89     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
  90     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
  91     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
  92     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
  93     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
  94     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
  95     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
  96     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
  97     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
  98     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
  99     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
 100     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
 101     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
 102     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
 103     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
 104     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
 105     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
 106     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
 107     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
 108     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
 109     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
 110     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
 111     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
 112     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
 113     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
 114     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
 115     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
 116     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
 117     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
 118     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
 119     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
 120     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
 121 };
 122
 123 uint32_t
 124 hammer2_icrc32(const void *buf, size_t size)
 125 {
 126      const uint8_t *p = buf;
 127      uint32_t crc = 0;
 128
 129      crc = crc ^ 0xffffffff;
 130      while (size--)
 131           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
 132      crc = crc ^ 0xffffffff;
 133      return crc;
 134 }
 135
 136 uint32_t
 137 hammer2_icrc32c(const void *buf, size_t size, uint32_t crc)
 138 {
 139      const uint8_t *p = buf;
 140
 141      crc = crc ^ 0xffffffff;
 142      while (size--)
 143           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
 144      crc = crc ^ 0xffffffff;
 145      return crc;
 146 }