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/* base64 routines.
*
* (C) 2003 Anope Team
* Contact us at info@anope.org
*
* Please read COPYING and README for furhter details.
*
* Based on the original code of Epona by Lara.
* Based on the original code of Services by Andy Church.
*
*
*/
/*
This is borrowed from Unreal
*/
#include "services.h"
static char *int_to_base64(long);
static long base64_to_int(char *);
char *base64enc(long i)
{
if (i < 0)
return ("0");
return int_to_base64(i);
}
long base64dec(char *b64)
{
if (b64)
return base64_to_int(b64);
else
return 0;
}
/* ':' and '#' and '&' and '+' and '@' must never be in this table. */
/* these tables must NEVER CHANGE! >) */
char int6_to_base64_map[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
'E', 'F',
'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V',
'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'l',
'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'{', '}'
};
char base64_to_int6_map[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1,
-1, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, -1, 63, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
static char *int_to_base64(long val)
{
/* 32/6 == max 6 bytes for representation,
* +1 for the null, +1 for byte boundaries
*/
static char base64buf[8];
long i = 7;
base64buf[i] = '\0';
/* Temporary debugging code.. remove before 2038 ;p.
* This might happen in case of 64bit longs (opteron/ia64),
* if the value is then too large it can easily lead to
* a buffer underflow and thus to a crash. -- Syzop
*/
if (val > 2147483647L) {
abort();
}
do {
base64buf[--i] = int6_to_base64_map[val & 63];
}
while (val >>= 6);
return base64buf + i;
}
static long base64_to_int(char *b64)
{
int v = base64_to_int6_map[(u_char) * b64++];
if (!b64)
return 0;
while (*b64) {
v <<= 6;
v += base64_to_int6_map[(u_char) * b64++];
}
return v;
}
long base64dects(char *ts)
{
char *token;
if (!ts) {
return 0;
}
token = myStrGetToken(ts, '!', 1);
if (!token) {
return strtoul(ts, NULL, 10);;
}
return base64dec(token);
}
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