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/* Proxytunnel - (C) 2001-2008 Jos Visser / Mark Janssen */
/* Contact: josv@osp.nl / maniac@maniac.nl */
/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include "config.h"
#include "cmdline.h"
#include "base64.h"
#include <ctype.h>
/* Needed for base64 encoding... */
static const char base64digits[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#define BAD -1
static const char base64val[] = {
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD,
BAD,BAD,BAD,BAD, BAD,BAD,BAD,BAD, BAD,BAD,BAD, 62, BAD,BAD,BAD, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,BAD,BAD, BAD,BAD,BAD,BAD,
BAD, 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,BAD, BAD,BAD,BAD,BAD,
BAD, 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,BAD, BAD,BAD,BAD,BAD
};
#define DECODE64(c) (isascii(c) ? base64val[c] : BAD)
/* Small MAX macro */
#ifndef MAX
#define MAX( x, y ) ( ( (x)>(y) ) ? (x) : (y) )
#endif
/*
* This base64 code is heavily modified from fetchmail (also GPL'd, of
* course) by Brendan Cully <brendan@kublai.com>.
*
* Original copyright notice:
*
* The code in the fetchmail distribution is Copyright 1997 by Eric
* S. Raymond. Portions are also copyrighted by Carl Harris, 1993
* and 1995. Copyright retained for the purpose of protecting free
* redistribution of source.
*
*/
/* raw bytes to null-terminated base 64 string */
void base64(unsigned char *out, const unsigned char *in, int len) {
while (len >= 3) {
*out++ = base64digits[in[0] >> 2];
*out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*out++ = base64digits[in[2] & 0x3f];
len -= 3;
in += 3;
}
/* clean up remainder */
if (len > 0) {
unsigned char fragment;
*out++ = base64digits[in[0] >> 2];
fragment = (in[0] << 4) & 0x30;
if (len > 1)
fragment |= in[1] >> 4;
*out++ = base64digits[fragment];
*out++ = (len < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
*out++ = '=';
}
*out = '\0';
}
/* base 64 to raw bytes in quasi-big-endian order, returning count of bytes */
/* maxlen limits output buffer size, set to zero to ignore */
int unbase64(unsigned char *out, const unsigned char *in, int maxlen) {
int len = 0;
register unsigned char digit1, digit2, digit3, digit4;
if (in[0] == '+' && in[1] == ' ')
in += 2;
if (*in == '\r')
return(0);
do {
digit1 = in[0];
if (DECODE64(digit1) == BAD)
return(-1);
digit2 = in[1];
if (DECODE64(digit2) == BAD)
return(-1);
digit3 = in[2];
if (digit3 != '=' && DECODE64(digit3) == BAD)
return(-1);
digit4 = in[3];
if (digit4 != '=' && DECODE64(digit4) == BAD)
return(-1);
in += 4;
++len;
if (maxlen && len > maxlen)
return(-1);
*out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4);
if (digit3 != '=') {
++len;
if (maxlen && len > maxlen)
return(-1);
*out++ = ((DECODE64(digit2) << 4) & 0xf0) | (DECODE64(digit3) >> 2);
if (digit4 != '=') {
++len;
if (maxlen && len > maxlen)
return(-1);
*out++ = ((DECODE64(digit3) << 6) & 0xc0) | DECODE64(digit4);
}
}
} while (*in && *in != '\r' && digit4 != '=');
return (len);
}
// vim:noexpandtab:ts=4
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