The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libkern/icrc32.c

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    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 #ifdef _KERNEL
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #else
   36 #include <sys/types.h>
   37 #endif
   38 
   39 #ifndef _KERNEL
   40 /* prototypes for the kernel are in <sys/systm.h> */
   41 uint32_t iscsi_crc32(const void *buf, size_t size);
   42 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc);
   43 #endif
   44 
   45 /*****************************************************************/
   46 /*                                                               */
   47 /* CRC LOOKUP TABLE                                              */
   48 /* ================                                              */
   49 /* The following CRC lookup table was generated automagically    */
   50 /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
   51 /* Program V1.0 using the following model parameters:            */
   52 /*                                                               */
   53 /*    Width   : 4 bytes.                                         */
   54 /*    Poly    : 0x1EDC6F41L                                      */
   55 /*    Reverse : TRUE.                                            */
   56 /*                                                               */
   57 /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
   58 /* see the document titled "A Painless Guide to CRC Error        */
   59 /* Detection Algorithms" by Ross Williams                        */
   60 /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
   61 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
   62 /*                                                               */
   63 /*****************************************************************/
   64 
   65 static uint32_t iscsiCrc32Table[256] = {
   66     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
   67     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
   68     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
   69     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
   70     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
   71     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
   72     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
   73     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
   74     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
   75     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
   76     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
   77     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
   78     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
   79     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
   80     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
   81     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
   82     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
   83     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
   84     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
   85     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
   86     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
   87     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
   88     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
   89     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
   90     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
   91     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
   92     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
   93     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
   94     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
   95     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
   96     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
   97     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
   98     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
   99     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
  100     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
  101     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
  102     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
  103     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
  104     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
  105     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
  106     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
  107     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
  108     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
  109     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
  110     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
  111     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
  112     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
  113     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
  114     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
  115     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
  116     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
  117     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
  118     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
  119     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
  120     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
  121     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
  122     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
  123     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
  124     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
  125     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
  126     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
  127     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
  128     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
  129     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
  130 };
  131 
  132 uint32_t
  133 iscsi_crc32(const void *buf, size_t size)
  134 {
  135      const uint8_t *p = buf;
  136      uint32_t crc = 0;
  137 
  138      crc = crc ^ 0xffffffff;
  139      while (size--)
  140           crc = iscsiCrc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
  141      crc = crc ^ 0xffffffff;
  142      return crc;
  143 }
  144 
  145 uint32_t
  146 iscsi_crc32_ext(const void *buf, size_t size, uint32_t crc)
  147 {
  148      const uint8_t *p = buf;
  149 
  150      crc = crc ^ 0xffffffff;
  151      while (size--)
  152           crc = iscsiCrc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
  153      crc = crc ^ 0xffffffff;
  154      return crc;
  155 }

Cache object: d038b1b9169555d15ab29a290f293263


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