/*  crcccitt.c - a demonstration of look up table based CRC
 *               computation using the non-reversed CCITT_CRC
 *               polynomial 0x1021 (truncated)
 *
 *  Copyright (C) 2000  Jack Klein
 *                      Macmillan Computer Publishing
 *
 *  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 program is distributed in the hope that it will
 *  be useful, but WITHOUT ANY WARRANTY; without even the
 *  implied warranty of MERCHANTABILITY or FITNESS FOR A
 *  PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General
 *  Public License along with this program; if not, write
 *  to the Free Software Foundation, Inc., 675 Mass Ave,
 *  Cambridge, MA 02139, USA.
 *
 *  Jack Klein may be contacted by email at:
 *     The_C_Guru@yahoo.com
 *
 */

#include <stdio.h>
#include <stdlib.h>

static unsigned short crc_table [256] =
{
  0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
  0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
  0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
  0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
  0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
  0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
  0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
  0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738,
  0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5,
  0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
  0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969,
  0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
  0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
  0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03,
  0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
  0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6,
  0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
  0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
  0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb,
  0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1,
  0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c,
  0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2,
  0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
  0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447,
  0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
  0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2,
  0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
  0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827,
  0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
  0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0,
  0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d,
  0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
  0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
  0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba,
  0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
  0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};

unsigned short
CRCCCITT(unsigned char *data, size_t length,
      unsigned short seed, unsigned short final)
{
  size_t count;
  unsigned int crc = seed;
  unsigned int temp;

  for (count = 0; count < length; ++count)
  {
    temp = (*data++ ^ (crc >> 8)) & 0xff;
    crc = crc_table[temp] ^ (crc << 8);
  }
  return (unsigned short)(crc ^ final);
}

#define TEST_SIZE 256

int main(int argc, char **argv)
{
  FILE *fin;
  size_t how_many;
  unsigned short the_crc;
  unsigned char buff [TEST_SIZE + 2];

  if (argc < 2)
  {
    puts("usage: crcccitt filename");
    return EXIT_FAILURE;
  }
  else if (NULL == (fin = fopen(argv[1], "rb")))
  {
    printf("crcccitt: can't open %s\n", argv[1]);
    return EXIT_FAILURE;
  }

  how_many = fread(buff, 1, TEST_SIZE, fin);

  fclose(fin);

  if (how_many != TEST_SIZE)
  {
    printf("crcccitt: error reading %s\n", argv[1]);
    return EXIT_FAILURE;
  }

  the_crc = CRCCCITT(buff, TEST_SIZE, 0xffff, 0);
  printf("Initial CRC value is 0x%04X\n", the_crc);

  buff [TEST_SIZE] = (unsigned char)((the_crc >> 8) & 0xff);
  buff [TEST_SIZE + 1] = (unsigned char)(the_crc & 0xff);

  the_crc = CRCCCITT(buff, TEST_SIZE + 2, 0xffff, 0);
  printf("Final CRC value is 0x%04X\n", the_crc);

  return EXIT_SUCCESS;
}

