tst_crc.c

Port串行通信

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

#include "lib_crc.h"



    /*******************************************************************\
    *                                                                   *
    *   Library         : lib_crc                                       *
    *   File            : tst_crc.c                                     *
    *   Author          : Lammert Bies  1999                            *
    *   E-mail          : [e-mail]                           *
    *   Language        : ANSI C                                        *
    *                                                                   *
    *                                                                   *
    *   Description                                                     *
    *   ===========                                                     *
    *                                                                   *
    *   The file tst_crc.c contains a small  sample  program  which     *
    *   demonstrates  the  use of the functions for calculating the     *
    *   CRC-CCITT, CRC-16 and CRC-32 values of data. The file  cal-     *
    *   culates  the three different CRC's for a file who's name is     *
    *   either provided at the command  line,  or  typed  in  right     *
    *   after the program has started.                                  *
    *                                                                   *
    *                                                                   *
    *   Dependencies                                                    *
    *   ============                                                    *
    *                                                                   *
    *   lib_crc.h       CRC definitions and prototypes                  *
    *   lib_crc.c       CRC routines                                    *
    *                                                                   *
    *                                                                   *
    *   Modification history                                            *
    *   ====================                                            *
    *                                                                   *
    *   Date        Version Comment                                     *
    *                                                                   *
    *   1999-02-21  1.01    none                                        *
    *                                                                   *
    *   1999-01-22  1.00    Initial source                              *
    *                                                                   *
    \*******************************************************************/

void main( int argc, char *argv[] ) {

    char file[256];
    char *ptr;
    unsigned short crc_16, crc_ccitt;
    unsigned long crc_32;
    int a, ch;
    FILE *fp;

    printf( "\nCRC algorithm sample program\nLammert Bies,  Version " CRC_VERSION "\n\n" );

    if ( argc < 2 ) {

        printf( "File: " );
        fgets( file, 255, stdin );
    }

    ptr = file;
    while ( *ptr  &&  *ptr != '\r'  &&  *ptr != '\n' ) ptr++;
    *ptr = 0;

    a = 1;

    do {

        if ( a < argc ) strcpy( file, argv[a] );

        crc_16    = 0;
        crc_ccitt = 0;
        crc_32    = 0xffffffffL;

        fp = fopen( file, "rb" );

        if ( fp != NULL ) {

            while( ( ch=fgetc( fp ) ) != EOF ) {

                crc_16    = update_crc_16(    crc_16,    (char) ch );
                crc_ccitt = update_crc_ccitt( crc_ccitt, (char) ch );
                crc_32    = update_crc_32(    crc_32,    (char) ch );
            }

            crc_32 ^= 0xffffffffL;

            fclose( fp );

            printf( "%-20s : CRC16 = 0x%04X  CRC-CCITT = 0x%04X  CRC32 = 0x%08lX\n"
                        , file
                        , crc_16
                        , crc_ccitt
                        , crc_32 );
        }

        else printf( "%-20s : cannot open file\n", file );

        a++;

    } while ( a < argc );

}  /* main (tst_crc.c) */