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hping2

    1: /*
    2:  * hex2bin - simple hex to bin filter
    3:  * antirez@invece.org - under GPL version 2
    4:  */
    5: 
    6: #include <stdio.h>
    7: #include <sys/stat.h>
    8: #include <sys/types.h>
    9: #include <fcntl.h>
   10: #include <unistd.h>
   11: #include <string.h>
   12: 
   13: int hex2bin(void)
   14: {
   15: 	char hex[3];
   16: 	int d = 0;
   17: 	unsigned char c;
   18: 	int stdin_fd = fileno(stdin);
   19: 	int n_read;
   20: 
   21: 	while((n_read = read(stdin_fd, hex, 2)) > 0)
   22: 	{
   23: 		if (n_read == 1)
   24: 		{
   25: 			if (hex[0] != '\n')
   26: 			{
   27: 				fprintf(stderr,
   28: 				"input parse error, odd digits in hex file\n");
   29: 				exit(1);
   30: 			}
   31: 			else
   32: 				exit(1);
   33: 		}
   34: 		hex[2] = '\0';
   35: 		sscanf(hex, "%x", &d);
   36: 		c = (unsigned char) d;
   37: 		printf("%c", c);
   38: 	}
   39: 	return 0;
   40: }
   41: 
   42: int bin2hex(void)
   43: {
   44: 	int stdin_fd = fileno(stdin);
   45: 	int n_read;
   46: 	unsigned char c;
   47: 
   48: 	while((n_read = read(stdin_fd, &c, 1)) > 0)
   49: 	{
   50: 		printf("%.2x", c);
   51: 	}
   52: 	return 0;
   53: }
   54: 
   55: int main(int argc, char **argv)
   56: {
   57: 	if (argc >= 2 && strstr(argv[1], "-r"))
   58: 		bin2hex();
   59: 	else
   60: 		hex2bin();
   61: 
   62: 	return 0;
   63: }