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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2012 Marcin Bukat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "crc32-rkw.h"
/* Slightly modified version of the crc32 algorithm generated with help of
* pycrc http://www.tty1.net/pycrc/index_en.html
* pycrc.py --width 32 --xor-in 0 --xor-out 0 --poly 0x04c10db7 \
* --reflect-in false --reflect-out false \
* --algorithm table-driven --table-idx-width 8 --generate c
*/
static const uint32_t crc_table[256] = {
0x00000000, 0x04c10db7, 0x09821b6e, 0x0d4316d9,
0x130436dc, 0x17c53b6b, 0x1a862db2, 0x1e472005,
0x26086db8, 0x22c9600f, 0x2f8a76d6, 0x2b4b7b61,
0x350c5b64, 0x31cd56d3, 0x3c8e400a, 0x384f4dbd,
0x4c10db70, 0x48d1d6c7, 0x4592c01e, 0x4153cda9,
0x5f14edac, 0x5bd5e01b, 0x5696f6c2, 0x5257fb75,
0x6a18b6c8, 0x6ed9bb7f, 0x639aada6, 0x675ba011,
0x791c8014, 0x7ddd8da3, 0x709e9b7a, 0x745f96cd,
0x9821b6e0, 0x9ce0bb57, 0x91a3ad8e, 0x9562a039,
0x8b25803c, 0x8fe48d8b, 0x82a79b52, 0x866696e5,
0xbe29db58, 0xbae8d6ef, 0xb7abc036, 0xb36acd81,
0xad2ded84, 0xa9ece033, 0xa4aff6ea, 0xa06efb5d,
0xd4316d90, 0xd0f06027, 0xddb376fe, 0xd9727b49,
0xc7355b4c, 0xc3f456fb, 0xceb74022, 0xca764d95,
0xf2390028, 0xf6f80d9f, 0xfbbb1b46, 0xff7a16f1,
0xe13d36f4, 0xe5fc3b43, 0xe8bf2d9a, 0xec7e202d,
0x34826077, 0x30436dc0, 0x3d007b19, 0x39c176ae,
0x278656ab, 0x23475b1c, 0x2e044dc5, 0x2ac54072,
0x128a0dcf, 0x164b0078, 0x1b0816a1, 0x1fc91b16,
0x018e3b13, 0x054f36a4, 0x080c207d, 0x0ccd2dca,
0x7892bb07, 0x7c53b6b0, 0x7110a069, 0x75d1adde,
0x6b968ddb, 0x6f57806c, 0x621496b5, 0x66d59b02,
0x5e9ad6bf, 0x5a5bdb08, 0x5718cdd1, 0x53d9c066,
0x4d9ee063, 0x495fedd4, 0x441cfb0d, 0x40ddf6ba,
0xaca3d697, 0xa862db20, 0xa521cdf9, 0xa1e0c04e,
0xbfa7e04b, 0xbb66edfc, 0xb625fb25, 0xb2e4f692,
0x8aabbb2f, 0x8e6ab698, 0x8329a041, 0x87e8adf6,
0x99af8df3, 0x9d6e8044, 0x902d969d, 0x94ec9b2a,
0xe0b30de7, 0xe4720050, 0xe9311689, 0xedf01b3e,
0xf3b73b3b, 0xf776368c, 0xfa352055, 0xfef42de2,
0xc6bb605f, 0xc27a6de8, 0xcf397b31, 0xcbf87686,
0xd5bf5683, 0xd17e5b34, 0xdc3d4ded, 0xd8fc405a,
0x6904c0ee, 0x6dc5cd59, 0x6086db80, 0x6447d637,
0x7a00f632, 0x7ec1fb85, 0x7382ed5c, 0x7743e0eb,
0x4f0cad56, 0x4bcda0e1, 0x468eb638, 0x424fbb8f,
0x5c089b8a, 0x58c9963d, 0x558a80e4, 0x514b8d53,
0x25141b9e, 0x21d51629, 0x2c9600f0, 0x28570d47,
0x36102d42, 0x32d120f5, 0x3f92362c, 0x3b533b9b,
0x031c7626, 0x07dd7b91, 0x0a9e6d48, 0x0e5f60ff,
0x101840fa, 0x14d94d4d, 0x199a5b94, 0x1d5b5623,
0xf125760e, 0xf5e47bb9, 0xf8a76d60, 0xfc6660d7,
0xe22140d2, 0xe6e04d65, 0xeba35bbc, 0xef62560b,
0xd72d1bb6, 0xd3ec1601, 0xdeaf00d8, 0xda6e0d6f,
0xc4292d6a, 0xc0e820dd, 0xcdab3604, 0xc96a3bb3,
0xbd35ad7e, 0xb9f4a0c9, 0xb4b7b610, 0xb076bba7,
0xae319ba2, 0xaaf09615, 0xa7b380cc, 0xa3728d7b,
0x9b3dc0c6, 0x9ffccd71, 0x92bfdba8, 0x967ed61f,
0x8839f61a, 0x8cf8fbad, 0x81bbed74, 0x857ae0c3,
0x5d86a099, 0x5947ad2e, 0x5404bbf7, 0x50c5b640,
0x4e829645, 0x4a439bf2, 0x47008d2b, 0x43c1809c,
0x7b8ecd21, 0x7f4fc096, 0x720cd64f, 0x76cddbf8,
0x688afbfd, 0x6c4bf64a, 0x6108e093, 0x65c9ed24,
0x11967be9, 0x1557765e, 0x18146087, 0x1cd56d30,
0x02924d35, 0x06534082, 0x0b10565b, 0x0fd15bec,
0x379e1651, 0x335f1be6, 0x3e1c0d3f, 0x3add0088,
0x249a208d, 0x205b2d3a, 0x2d183be3, 0x29d93654,
0xc5a71679, 0xc1661bce, 0xcc250d17, 0xc8e400a0,
0xd6a320a5, 0xd2622d12, 0xdf213bcb, 0xdbe0367c,
0xe3af7bc1, 0xe76e7676, 0xea2d60af, 0xeeec6d18,
0xf0ab4d1d, 0xf46a40aa, 0xf9295673, 0xfde85bc4,
0x89b7cd09, 0x8d76c0be, 0x8035d667, 0x84f4dbd0,
0x9ab3fbd5, 0x9e72f662, 0x9331e0bb, 0x97f0ed0c,
0xafbfa0b1, 0xab7ead06, 0xa63dbbdf, 0xa2fcb668,
0xbcbb966d, 0xb87a9bda, 0xb5398d03, 0xb1f880b4
};
uint32_t crc32_rkw(const uint8_t *data, uint32_t len)
{
uint8_t tbl_idx;
uint32_t crc = 0;
while (len--)
{
tbl_idx = ((crc >> 24) ^ *data) & 0xff;
crc = (crc_table[tbl_idx] ^ (crc << 8)) & 0xffffffff;
data++;
}
return crc;
}
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