/*
?*?base64rev?generator
?*
?*?Copyright?2009-2010?Krzysztof?Piotr?Oledzki?
?*
?*?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?

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?se64rev）;?i++）
		base64rev[i]?=?base;

	for?（i?=?0;??i?		c?=?base64tab[i];

		if?（min?>?c）
			min?=?c;

		if?（max?			max?=?c;
	}

	for?（i?=?0;??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;
}