Funciones basicas
/* base64 encoding/decoding AzRaEL [NuKE] */
const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char ascii[256] =
{
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
void
base64_in (unsigned char *buf, char *obuf, int len)
{
int i;
for (i = 0; i < len - 2; i += 3)
{
*obuf++ = b64[(buf
>> 2) & 0x3F];
*obuf++ = b64[((buf & 0x3) << 4 | ((int) (buf[i + 1] & 0xF0) >> 4))];
*obuf++ = b64[((buf[i + 1] & 0xF) << 2) | ((int) (buf[i + 2] & 0xC0) >> 6)];
*obuf++ = b64[buf[i + 2] & 0x3F];
}
if (i < len)
{
*obuf++ = b64[(buf >> 2) & 0x3F];
if (i == (len - 1))
{
*obuf++ = b64[((buf & 0x3) << 4)];
// *obuf++ = '=';
}
else
{
*obuf++ = b64[((buf & 0x3) << 4 | ((int) (buf[i + 1] & 0xf0) >> 4))];
*obuf++ = b64[((buf[i + 1] & 0xf) << 2)];
}
// *obuf++ = '=';
}
*obuf++ = '\0';
}
void
base64_out (char *buf, unsigned char *obuf, int len)
{
int nprbytes;
char *p = buf;
while (ascii[(int) *(p++)] <= 63);
nprbytes = len - 1;
while (nprbytes > 4 && *buf != '\0')
{
*(obuf++) = (ascii[(int) *buf] << 2 | ascii[(int) buf[1]] >> 4);
*(obuf++) = (ascii[(int) buf[1]] << 4 | ascii[(int) buf[2]] >> 2);
*(obuf++) = (ascii[(int) buf[2]] << 6 | ascii[(int) buf[3]]);
buf += 4;
nprbytes -= 4;
}
if (nprbytes > 1)
*(obuf++) =
(ascii[(int) *buf] << 2 | ascii[(int) buf[1]] >> 4);
if (nprbytes > 2)
*(obuf++) =
(ascii[(int) buf[1]] << 4 | ascii[(int) buf[2]] >> 2);
if (nprbytes > 3)
*(obuf++) =
(ascii[(int) buf[2]] << 6 | ascii[(int) buf[3]]);
*(obuf)++ = '\0';
}
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