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/*
* base64rev generator
*
* Copyright 2009-2010 Krzysztof Piotr Oledzki <ole@ans.pl>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdio.h>
const char base64tab[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char base64rev[128];
#define base '#' /* arbitrary chosen base value */
#define B64MAX 64
#define B64PADV B64MAX
int main() {
char *p, c;
int i, min = 255, max = 0;
for (i = 0; i < sizeof(base64rev); i++)
base64rev[i] = base;
for (i = 0; i < B64MAX; i++) {
c = base64tab[i];
if (min > c)
min = c;
if (max < c)
max = c;
}
for (i = 0; i < B64MAX; i++) {
c = base64tab[i];
if (base+i+1 > 127) {
printf("Wrong base value @%d\n", i);
return 1;
}
base64rev[c - min] = base+i+1;
}
base64rev['=' - min] = base + B64PADV;
base64rev[max - min + 1] = '\0';
printf("#define B64BASE '%c'\n", base);
printf("#define B64CMIN '%c'\n", min);
printf("#define B64CMAX '%c'\n", max);
printf("#define B64PADV %u\n", B64PADV);
p = base64rev;
printf("const char base64rev[]=\"");
for (p = base64rev; *p; p++) {
if (*p == '\\')
printf("\\%c", *p);
else
printf("%c", *p);
}
printf("\"\n");
return 0;
}
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