| /* |
| * This file is derived from work of Ross N. Williams, which is described in |
| * the document "A Painless Guide to CRC Error Detection Algorithms". |
| * The document can be found here: |
| * <http://www.ross.net/crc/download/crc_v3.txt> |
| * |
| * It contains the following copyright and status information: |
| * ----- quote start ----- |
| * Version : 3. |
| * Date : 19 August 1993. |
| * Author : Ross N. Williams. |
| * Net : ross@guest.adelaide.edu.au. |
| * FTP : ftp.adelaide.edu.au/pub/rocksoft/crc_v3.txt |
| * Company : Rocksoft^tm Pty Ltd. |
| * Snail : 16 Lerwick Avenue, Hazelwood Park 5066, Australia. |
| * Fax : +61 8 373-4911 (c/- Internode Systems Pty Ltd). |
| * Phone : +61 8 379-9217 (10am to 10pm Adelaide Australia time). |
| * Note : "Rocksoft" is a trademark of Rocksoft Pty Ltd, Australia. |
| * Status : Copyright (C) Ross Williams, 1993. However, permission is |
| * granted to make and distribute verbatim copies of this |
| * document provided that this information block and copyright |
| * notice is included. Also, the C code modules included |
| * in this document are fully public domain. |
| * Thanks : Thanks to Jean-loup Gailly (jloup@chorus.fr) and Mark Adler |
| * (me@quest.jpl.nasa.gov) who both proof read this document |
| * and picked out lots of nits as well as some big fat bugs. |
| * ----- quote end ----- |
| * |
| * The CRC lookup table is generated by using code from the aforementioned |
| * document of Ross N. Williams. The function crc32c_calc() is a slightly |
| * modified copy of the function crc_reflected() from the mentioned document. |
| * The modifications and the modified code are fully public domain. |
| */ |
| |
| /* |
| * This file contains a function to calculate the CRC-32C. |
| * These functions are used internally in the far-rcv library. |
| */ |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| #define INIT_REFLECTED 0UL |
| #define XOROT 0UL |
| |
| |
| /*****************************************************************/ |
| /* */ |
| /* CRC LOOKUP TABLE */ |
| /* ================ */ |
| /* The following CRC lookup table was generated automagically */ |
| /* by the Rocksoft^tm Model CRC Algorithm Table Generation */ |
| /* Program V1.0 using the following model parameters: */ |
| /* */ |
| /* Width : 4 bytes. */ |
| /* Poly : 0x1EDC6F41L */ |
| /* Reverse : TRUE. */ |
| /* */ |
| /* For more information on the Rocksoft^tm Model CRC Algorithm, */ |
| /* see the document titled "A Painless Guide to CRC Error */ |
| /* Detection Algorithms" by Ross Williams */ |
| /* (ross@guest.adelaide.edu.au.). This document is likely to be */ |
| /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft". */ |
| /* */ |
| /*****************************************************************/ |
| |
| static uint32_t crctable[256] = { |
| 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, |
| 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, |
| 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, |
| 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, |
| 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, |
| 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, |
| 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, |
| 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, |
| 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, |
| 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, |
| 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, |
| 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, |
| 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, |
| 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, |
| 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, |
| 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, |
| 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, |
| 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, |
| 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, |
| 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, |
| 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, |
| 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, |
| 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, |
| 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, |
| 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, |
| 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, |
| 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, |
| 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, |
| 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, |
| 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, |
| 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, |
| 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, |
| 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, |
| 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, |
| 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, |
| 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, |
| 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, |
| 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, |
| 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, |
| 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, |
| 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, |
| 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, |
| 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, |
| 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, |
| 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, |
| 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, |
| 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, |
| 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, |
| 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, |
| 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, |
| 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, |
| 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, |
| 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, |
| 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, |
| 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, |
| 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, |
| 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, |
| 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, |
| 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, |
| 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, |
| 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, |
| 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, |
| 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, |
| 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L |
| }; |
| |
| /*****************************************************************/ |
| /* End of CRC Lookup Table */ |
| /*****************************************************************/ |
| |
| uint32_t far_crc32c_calc(uint32_t crc, const unsigned char *blk_adr, |
| size_t blk_len) |
| { |
| while (blk_len--) |
| crc = crctable[(crc ^ *blk_adr++) & 0xFFL] ^ (crc >> 8); |
| |
| return crc ^ XOROT; |
| } |
