RetroArch/libretro-common/utils/crc32.c
2015-08-28 21:35:09 +02:00

44 lines
804 B
C

/* gcc -O3 -o crc32 crc32.c -lz */
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <compat/zlib.h>
int main(int argc, const char* argv[])
{
if (argc != 2 )
{
fprintf( stderr, "Usage: crc32 <filename>\n" );
return 1;
}
FILE *file = fopen(argv[1], "rb");
if (file)
{
uLong crc = crc32(0L, Z_NULL, 0 );
for (;;)
{
Bytef buffer[16384];
int numread = fread((void*)buffer, 1, sizeof(buffer), file);
if (numread > 0)
crc = crc32( crc, buffer, numread );
else
break;
}
fclose(file);
printf("%08x\n", crc);
return 0;
}
fprintf(stderr, "Error opening input file: %s\n", strerror(errno));
return 1;
}