ttomb-kdb-hexencode.c - coffin - secure lan file storage on a device
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       ttomb-kdb-hexencode.c (951B)
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            1 /*
            2  * A simple utility that reads from stdin and output the hexencoding (on a single line) of the input
            3  */
            4 
            5 #include <stdio.h>
            6 #include <stdlib.h>
            7 #include <getopt.h>
            8 
            9 static int decode_mode = 0;
           10 int main(int argc, char *argv[]) {
           11         char c;
           12         char buf[3];
           13         int read_bytes;
           14         int opt;
           15         static struct option long_options[] =
           16         {
           17                 {"decode", no_argument, &decode_mode, 1},
           18                 {"encode", no_argument, &decode_mode, 0},
           19                 {0,0,0,0}
           20         };
           21         int option_index = 0;
           22 
           23         while(1) {
           24                 option_index = 0;
           25                 opt = getopt_long(argc, argv, "", long_options, &option_index);
           26                 if(opt == -1)
           27                         break;
           28                 switch(opt) {
           29                         case 0:
           30                                 break;
           31                         case '?':
           32                                 return 127;
           33                         default:
           34                                 abort();
           35                 }
           36         }
           37         if(decode_mode == 0) {
           38                 while(( c = (char)getchar() ) != EOF)
           39                         printf("%02x", c);
           40                 return 0;
           41         } else {
           42                 while( (read_bytes=fread(buf, sizeof(char), 2, stdin)) != 0) {
           43                         if(read_bytes == 1) buf[1]='\0';
           44                         sscanf(buf, "%c", &c);
           45                         printf("%c", c);
           46                 }
           47                 return 0;
           48         }
           49 }