www.pudn.com > crc_16.zip > crc_16.cpp

// crc_16.cpp : ÄÜ¼Ö ÀÀ¿ë ÇÁ·Î±×·¥¿¡ ´ëÇÑ ÁøÀÔÁ¡À» Á¤ÀÇÇÕ´Ï´Ù. 
// 
 
#include "stdafx.h" 
#include  
 
typedef unsigned short int  INT16U; 
typedef unsigned char INT8U; 
 
#define MAX_STRING_SIZE	2048 
 
INT16U calc_crc16(INT8U *buff, long length); 
 
 
 
INT16U crctblp[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  
}; 
 
int _tmain(int argc, const char* argv[]) 
{ 
	char input_string[MAX_STRING_SIZE]; 
 
	INT8U read_ddata[200000]; 
 
    char *ptr; 
 
	long file_size,copy_len; 
 
	INT16U crc_chk; 
 
	FILE *fp; 
 
    printf( "\nCRC16 algorithm sample program" ); 
 
    printf( "\n\n\nInput: " ); 
    fgets( input_string, MAX_STRING_SIZE-1, stdin ); 
 
    ptr = input_string; 
    while ( *ptr  &&  *ptr != '\r'  &&  *ptr != '\n' ) ptr++; 
    *ptr = 0; 
 
   if( (fp = fopen( input_string, "rb" )) == NULL ) // C4996 
      printf( "The file %s was not opened\n",input_string ); 
   else 
   { 
	printf( "The file %s was opened\n",input_string ); 
	fseek(fp,0,SEEK_END); //³¡À¸·Î °¡¶ó	 
	file_size = ftell(fp); 
	printf( "The file size : %d \n",file_size ); 
	 
	//fseek(fp,0,SEEK_SET); //óÀ½À¸·Î °¡¶ó 
	rewind(fp); 
 
	for(copy_len =0; copy_len < file_size; copy_len++) 
	{ 
		read_ddata[copy_len] = fgetc(fp); 
	} 
 
	crc_chk = calc_crc16(read_ddata, file_size); 
 
	printf( "The file crc dec : %d , hex : %x \n",crc_chk,crc_chk ); 
 
	_fcloseall(); 
 
   } 
 
	printf( "plese ENTER key !! \n" ); 
	getchar(); 
 
	return 0; 
} 
 
 
 
 
INT16U calc_crc16(INT8U *buff, long length) 
{ 
    long i;  
	INT16U accum = 0; 
    INT16U comb_val; 
	INT8U cnk; 
 
    for(i=0; i> 8) ^ cnk; 
        accum   = (accum << 8) ^ crctblp[comb_val]; 
    } 
 
  return accum ; 
}