Category : C Source Code
Archive : MSC_CRC.ZIP
Filename : CRCTEST.C
Output of file : CRCTEST.C contained in archive : MSC_CRC.ZIP
#include
#include
static long cr3tab[] = { /* CRC polynomial 0xedb88320 */
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
#define UPDC32(b, c) (cr3tab[((int)c ^ b) & 0xff] ^ ((c >> 8) & 0x00FFFFFF))
unsigned long UpdCrc32(char byte, unsigned long crc);
unsigned long BlkCrc32(char *block, unsigned count);
unsigned long UpdBlkCrc32(char *block, unsigned count, unsigned long crc);
unsigned long blk32crc(unsigned long *CrcIn, char *blk, int count);
unsigned long upd32crc(unsigned long *CrcIn, char databyte);
void timer_on(char dispflag);
long timer_off(void);
char msg[] = "\n\n\
32 bit CRC function performance test. This program reads a file up to\n\
20K bytes in length and calculates the 32 bit CRC of those bytes using\n\
the 5 different CRC functions in the ZIP file and the macro version that\n\
is in Chuck Forsberg's Zmodem Unix source code.\n\n\
UpdCrc32: table driven byte at a time CRC\n\
BlkCrc32: table driven block CRC with no initialization value\n\
UpdBlkCrc32: table driven block CRC with an initialization value\n\
upd32crc: non-table driven byte at a time CRC\n\
blk32crc: non-table driven block at a time CRC\n\
UPDC32: Chuck Forsberg's C macro version\n\n";
char buf[20*1024];
main(int argc, char *argv[])
{
FILE *fh;
register j;
register char *p1;
int i;
unsigned long crc, time;
printf("%s", msg);
if (argc != 2)
{
printf("Usage: test32 filename\n");
exit (-1);
}
if ((fh = fopen(argv[1], "rb")) == NULL)
{
printf("Can't open %s\n", argv[1]);
exit (-1);
}
i = fread(buf, 1, sizeof(buf), fh);
fclose(fh);
printf("%s, %d bytes\n\n", argv[1], i);
printf("Testing UpdCrc32.... ");
crc = -1L;
timer_on(0);
for (j = i, p1 = buf; j; --j)
crc = UpdCrc32(*p1++, crc);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n", ~crc, time);
printf("Testing BlkCrc32.... ");
timer_on(0);
crc = BlkCrc32(buf, i);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n", ~crc, time);
printf("Testing UpdBlkCrc32.... ");
timer_on(0);
crc = UpdBlkCrc32(buf, i, 0xffffffffL);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n", ~crc, time);
printf("Testing upd32crc.... ");
crc = -1L;
timer_on(0);
for (j = i, p1 = buf; j; --j)
upd32crc(&crc, *p1++);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n", ~crc, time);
printf("Testing blk32crc.... ");
timer_on(0);
crc = blk32crc(NULL, buf, i);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n", ~crc, time);
printf("Testing UPDC32.... ");
crc = -1L;
timer_on(0);
for (j = i, p1 = buf; j; --j)
crc = UPDC32(*p1++, crc);
time = timer_off();
printf(" CRC = 0x%08lX, Time = %08ld usecs\n\n", ~crc, time);
exit (0);
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/