Help!-Errors while running this snippet code

Discussion in 'C Programming' started by Kavitha Rao, Jul 2, 2003.

  1. Kavitha Rao

    Kavitha Rao Guest

    I am getting the following errors while trying to run this snippet
    in Microsoft Visual C++.Can't seem to print the crc value stored.

    /* +++Date last modified: 05-Jul-1997 */

    /* Crc - 32 BIT ANSI X3.66 CRC checksum files */

    #include <stdio.h>
    #include "crc.h"

    #ifdef __TURBOC__
    #pragma warn -cln

    |* Demonstration program to compute the 32-bit CRC used as the frame
    |* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71
    |* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level
    |* protocol). The 32-bit FCS was added via the Federal Register,
    |* 1 June 1982, p.23798. I presume but don't know for certain that
    |* this polynomial is or will be included in CCITT V.41, which
    |* defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS
    |* PUB 78 says that the 32-bit FCS reduces otherwise undetected
    |* errors by a factor of 10^-5 over 16-bit FCS.

    /* Need an unsigned type capable of holding 32 bits; */

    typedef DWORD UNS_32_BITS;

    /* Copyright (C) 1986 Gary S. Brown. You may use this program, or
    code or tables extracted from it, as desired without restriction.*/

    /* First, the polynomial itself and its table of feedback terms. The
    /* polynomial is
    /* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
    /* Note that we take it "backwards" and put the highest-order term in
    /* the lowest-order bit. The X^32 term is "implied"; the LSB is the
    /* X^31 term, etc. The X^0 term (usually shown as "+1") results in
    /* the MSB being 1.

    /* Note that the usual hardware shift register implementation, which
    /* is what we're using (we're merely optimizing it by doing eight-bit
    /* chunks at a time) shifts bits into the lowest-order term. In our
    /* implementation, that means shifting towards the right. Why do we
    /* do it this way? Because the calculated CRC must be transmitted in
    /* order from highest-order term to lowest-order term. UARTs transmit
    /* characters in order from LSB to MSB. By storing the CRC this way,
    /* we hand it to the UART in the order low-byte to high-byte; the UART
    /* sends each low-bit to hight-bit; and the result is transmission bit
    /* by bit from highest- to lowest-order term without requiring any bit
    /* shuffling on our part. Reception works similarly.

    /* The feedback terms table consists of 256, 32-bit entries. Notes:
    /* 1. The table can be generated at runtime if desired; code to do so
    /* is shown later. It might not be obvious, but the feedback
    /* terms simply represent the results of eight shift/xor opera-
    /* tions for all combinations of data and CRC register values.
    /* 2. The CRC accumulation logic is the same for all CRC polynomials,
    /* be they sixteen or thirty-two bits wide. You simply choose the
    /* appropriate table. Alternatively, because the table can be
    /* generated at runtime, you can start by generating the table for
    /* the polynomial in question and use exactly the same "updcrc",
    /* if your application needn't simultaneously handle two CRC
    /* polynomials. (Note, however, that XMODEM is strange.)
    /* 3. For 16-bit CRCs, the table entries need be only 16 bits wide;
    /* of course, 32-bit entries work OK if the high 16 bits are zero.
    /* 4. The values must be right-shifted by eight bits by the "updcrc"
    /* logic; the shift must be unsigned (bring in zeroes). On some
    /* hardware you could probably optimize the shift in assembler by
    /* using byte-swap instructions.

    static UNS_32_BITS crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e,
    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064,
    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551,
    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa,
    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5,
    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5,
    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb,
    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8,
    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541,
    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846,
    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c,
    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c,
    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12,
    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8,
    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd,
    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3,
    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9,
    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae,
    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff,
    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354,
    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a,
    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02,
    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d

    DWORD updateCRC32(unsigned char ch, DWORD crc)
    return UPDC32(ch, crc);

    Boolean_T crc32file(char *name, DWORD *crc, long *charcnt)
    register FILE *fin;
    register DWORD oldcrc32;
    register int c;

    oldcrc32 = 0xFFFFFFFF; *charcnt = 0;
    #ifdef MSDOS
    if ((fin=fopen(name, "rb"))==NULL)
    if ((fin=fopen(name, "r"))==NULL)
    return Error_;
    while ((c=getc(fin))!=EOF)
    oldcrc32 = UPDC32(c, oldcrc32);

    if (ferror(fin))
    *charcnt = -1;

    *crc = oldcrc32 = ~oldcrc32;

    return Success_;

    DWORD crc32buf(char *buf, size_t len)
    register DWORD oldcrc32;

    oldcrc32 = 0xFFFFFFFF;

    for ( ; len; --len, ++buf)
    oldcrc32 = UPDC32(*buf, oldcrc32);

    return ~oldcrc32;


    #ifdef TEST

    main(int argc, char *argv[])
    DWORD crc;
    long charcnt;
    register errors = 0;

    while(--argc > 0)
    errors |= crc32file(*++argv, &crc, &charcnt);
    printf("%08lX %7ld %s\n", crc, charcnt, *argv);
    return(errors != 0);

    #endif /* TEST */

    D:\Program Files\DevStudio\MyProjects\newz\CRC_32.C(30) : error C2282:
    'DWORD' is followed by 'crc32buf' (missing ','?)
    D:\Program Files\DevStudio\MyProjects\newz\CRC_32.C(84) : error C2282:
    'DWORD' is followed by 'crc_32_tab' (missing ','?)
    D:\Program Files\DevStudio\MyProjects\newz\CRC_32.C(128) : error
    C2059: syntax error : '}'
    D:\Program Files\DevStudio\MyProjects\newz\CRC_32.C(136) : error
    C2282: 'Boolean_T' is followed by 'crc32file' (missing ','?)
    D:\Program Files\DevStudio\MyProjects\newz\CRC_32.C(168) : error
    C2059: syntax error : '}'
    Error executing cl.exe.

    Thanks in advance for all Suggestions and help to run this code
    Kavitha Rao, Jul 2, 2003
    1. Advertisements

  2. Kavitha Rao

    Artie Gold Guest

    So why are you asking here? C is not C++.
    Furthermore, the (entirely too much) code you've posted is full of
    non-standard, platform specific material.

    Try a micro***t newsgroup.

    And before posting here again, RTFF!

    Artie Gold, Jul 2, 2003
    1. Advertisements

  3. Kavitha Rao

    Kavitha Rao Guest

    Thanks I have found the solution ,the code is working fine and
    prints the correct crc value.
    Kavitha Rao, Jul 3, 2003
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.