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/***************************************************************************\
* *
* BitlBee - An IRC to IM gateway *
* Base64 handling functions. encode_real() is mostly based on the y64 en- *
* coder from libyahoo2. Moving it to a new file because it's getting big. *
* *
* Copyright 2006 Wilmer van der Gaast <wilmer@gaast.net> *
* *
* 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. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
\***************************************************************************/
#include <glib.h>
#include <string.h>
#include "base64.h"
static const char real_b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
char *tobase64(const char *text)
{
return base64_encode((const unsigned char *)text, strlen(text));
}
char *base64_encode(const unsigned char *in, int len)
{
char *out;
out = g_malloc((len + 2) /* the == padding */
/ 3 /* every 3-byte block */
* 4 /* becomes a 4-byte one */
+ 1); /* and of course, ASCIIZ! */
base64_encode_real((unsigned char*) in, len, (unsigned char*) out, real_b64);
return out;
}
int base64_encode_real(const unsigned char *in, int inlen, unsigned char *out, const char *b64digits)
{
int outlen = 0;
for (; inlen >= 3; inlen -= 3)
{
out[outlen++] = b64digits[in[0] >> 2];
out[outlen++] = b64digits[((in[0]<<4) & 0x30) | (in[1]>>4)];
out[outlen++] = b64digits[((in[1]<<2) & 0x3c) | (in[2]>>6)];
out[outlen++] = b64digits[in[2] & 0x3f];
in += 3;
}
if (inlen > 0)
{
out[outlen++] = b64digits[in[0] >> 2];
if (inlen > 1)
{
out[outlen++] = b64digits[((in[0]<<4) & 0x30) | (in[1]>>4)];
out[outlen++] = b64digits[((in[1]<<2) & 0x3c)];
}
else
{
out[outlen++] = b64digits[((in[0]<<4) & 0x30)];
out[outlen++] = b64digits[64];
}
out[outlen++] = b64digits[64];
}
out[outlen] = 0;
return outlen;
}
/* Just a simple wrapper, but usually not very convenient because of zero
termination. */
char *frombase64(const char *in)
{
unsigned char *out;
base64_decode(in, &out);
return (char*) out;
}
/* FIXME: Lookup table stuff is not threadsafe! (But for now BitlBee is not threaded.) */
int base64_decode(const char *in, unsigned char **out)
{
static char b64rev[256] = { 0 };
int len, i;
/* Create a reverse-lookup for the Base64 sequence. */
if( b64rev[0] == 0 )
{
memset( b64rev, 0xff, 256 );
for( i = 0; i <= 64; i ++ )
b64rev[(int)real_b64[i]] = i;
}
len = strlen( in );
*out = g_malloc( ( len + 6 ) / 4 * 3 );
len = base64_decode_real( (unsigned char*) in, *out, b64rev );
*out = g_realloc( *out, len + 1 );
out[0][len] = 0; /* Zero termination can't hurt. */
return len;
}
int base64_decode_real(const unsigned char *in, unsigned char *out, char *b64rev)
{
int i, outlen = 0;
for( i = 0; in[i] && in[i+1] && in[i+2] && in[i+3]; i += 4 )
{
int sx;
sx = b64rev[(int)in[i+0]];
if( sx >= 64 )
break;
out[outlen] = ( sx << 2 ) & 0xfc;
sx = b64rev[(int)in[i+1]];
if( sx >= 64 )
break;
out[outlen] |= ( sx >> 4 ) & 0x03;
outlen ++;
out[outlen] = ( sx << 4 ) & 0xf0;
sx = b64rev[(int)in[i+2]];
if( sx >= 64 )
break;
out[outlen] |= ( sx >> 2 ) & 0x0f;
outlen ++;
out[outlen] = ( sx << 6 ) & 0xc0;
sx = b64rev[(int)in[i+3]];
if( sx >= 64 )
break;
out[outlen] |= sx;
outlen ++;
}
/* If sx > 64 the base64 string was damaged. Should we ignore this? */
return outlen;
}
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