lib/libdmsg/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 "dmsg_local.h"
  33
  34 /*****************************************************************/
  35 /*                                                               */
  36 /* CRC LOOKUP TABLE                                              */
  37 /* ================                                              */
  38 /* The following CRC lookup table was generated automagically    */
  39 /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
  40 /* Program V1.0 using the following model parameters:            */
  41 /*                                                               */
  42 /*    Width   : 4 bytes.                                         */
  43 /*    Poly    : 0x1EDC6F41L                                      */
  44 /*    Reverse : TRUE.                                            */
  45 /*                                                               */
  46 /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
  47 /* see the document titled "A Painless Guide to CRC Error        */
  48 /* Detection Algorithms" by Ross Williams                        */
  49 /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
  50 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
  51 /*                                                               */
  52 /*****************************************************************/
  53
  54 static const uint32_t dmsg_crc32Table[256] = {
  55     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
  56     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
  57     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
  58     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
  59     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
  60     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
  61     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
  62     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
  63     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
  64     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
  65     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
  66     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
  67     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
  68     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
  69     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
  70     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
  71     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
  72     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
  73     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
  74     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
  75     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
  76     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
  77     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
  78     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
  79     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
  80     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
  81     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
  82     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
  83     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
  84     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
  85     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
  86     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
  87     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
  88     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
  89     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
  90     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
  91     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
  92     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
  93     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
  94     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
  95     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
  96     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
  97     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
  98     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
  99     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
 100     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
 101     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
 102     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
 103     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
 104     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
 105     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
 106     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
 107     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
 108     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
 109     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
 110     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
 111     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
 112     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
 113     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
 114     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
 115     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
 116     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
 117     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
 118     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
 119 };
 120
 121 uint32_t
 122 dmsg_icrc32(const void *buf, size_t size)
 123 {
 124      const uint8_t *p = buf;
 125      uint32_t crc = 0;
 126
 127      crc = crc ^ 0xffffffff;
 128      while (size--)
 129           crc = dmsg_crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
 130      crc = crc ^ 0xffffffff;
 131      return crc;
 132 }
 133
 134 uint32_t
 135 dmsg_icrc32c(const void *buf, size_t size, uint32_t crc)
 136 {
 137      const uint8_t *p = buf;
 138
 139      crc = crc ^ 0xffffffff;
 140      while (size--)
 141           crc = dmsg_crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
 142      crc = crc ^ 0xffffffff;
 143      return crc;
 144 }