/*
**
** Copyright (C) 1994 Swedish University Network (SUNET)
** Modified by Rami Lehti (C) 1999
** $Header$
**
**
** 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 FITTNESS 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**
** Martin.Wendel@udac.uu.se
** Torbjorn.Wictorin@udac.uu.se
**
** UDAC
** P.O. Box 174
** S-751 04 Uppsala
** Sweden
**
*/
#include "aide.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "base64.h"
#include "report.h"
/*for locale support*/
#include "locale-aide.h"
/*for locale support*/
char tob64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int fromb64[] = {
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, SKIP, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
SKIP, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, 0x3e, FAIL, FAIL, FAIL, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
0x3c, 0x3d, FAIL, FAIL, FAIL, SKIP, FAIL, FAIL,
FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
0x31, 0x32, 0x33, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL,
FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL
};
/* Returns NULL on error */
/* FIXME Possible buffer overflow on outputs larger than B64_BUF */
char* encode_base64(byte* src,size_t ssize)
{
char* outbuf;
char* retbuf;
int pos;
int i, l, left;
unsigned long triple;
byte *inb;
error(235, "encode base64");
/* Exit on empty input */
if (!ssize||src==NULL){
error(240,"\n");
return NULL;
}
outbuf = (char *)malloc(sizeof(char)*B64_BUF);
/* Initialize working pointers */
inb = src;
i = 0;
triple = 0;
pos = 0;
left = ssize;
error(235, ", data length: %d\n", left);
/*
* Process entire inbuf.
*/
while (left != 0)
{
i++;
left--;
triple = (triple <<8) | *inb;
if (i == 3 || left == 0)
{
switch (i)
{
case 1:
triple = triple<<4;
break;
case 2:
triple = triple<<2;
break;
default:
break;
}
for (l = i; l >= 0; l--){
/* register */
int rr;
rr = 0x3f & (triple>>(6*l));
assert (rr < 64);
outbuf[pos]=tob64[rr];
pos++;
}
if (left == 0)
switch(i)
{
case 2:
outbuf[pos]='=';
pos++;
break;
case 1:
outbuf[pos]='=';
pos++;
outbuf[pos]='=';
pos++;
break;
default:
break;
}
triple = 0;
i = 0;
}
inb++;
}
/* outbuf is not completely used so we use retbuf */
retbuf=(char*)malloc(sizeof(char)*(pos+1));
memcpy(retbuf,outbuf,pos);
retbuf[pos]='\0';
free(outbuf);
return retbuf;
}
/* FIXME Possible buffer overflow on outputs larger than B64_BUF */
byte* decode_base64(char* src,size_t ssize, size_t *ret_len)
{
byte* outbuf;
byte* retbuf;
char* inb;
int i;
int l;
int left;
int pos;
unsigned long triple;
error(235, "decode base64\n");
/* Exit on empty input */
if (!ssize||src==NULL)
return NULL;
/* Initialize working pointers */
inb = src;
outbuf = (byte *)malloc(sizeof(byte)*B64_BUF);
l = 0;
triple = 0;
pos=0;
left = ssize;
/*
* Process entire inbuf.
*/
while (left != 0)
{
left--;
i = fromb64[(unsigned char)*inb];
switch(i)
{
case FAIL:
error(3, "decode_base64: Illegal character: %c\n", *inb);
error(230, "decode_base64: Illegal line:\n%s\n", src);
free(outbuf);
return NULL;
break;
case SKIP:
break;
default:
triple = triple<<6 | (0x3f & i);
l++;
break;
}
if (l == 4 || left == 0)
{
switch(l)
{
case 2:
triple = triple>>4;
break;
case 3:
triple = triple>>2;
break;
default:
break;
}
for (l -= 2; l >= 0; l--)
{
outbuf[pos]=( 0xff & (triple>>(l*8)));
pos++;
}
triple = 0;
l = 0;
}
inb++;
}
retbuf=(byte*)malloc(sizeof(byte)*(pos+1));
memcpy(retbuf,outbuf,pos);
retbuf[pos]='\0';
free(outbuf);
if (ret_len) *ret_len = pos;
return retbuf;
}
size_t length_base64(char* src,size_t ssize)
{
char* inb;
int i;
int l;
int left;
size_t pos;
//unsigned long triple;
error(235, "decode base64\n");
/* Exit on empty input */
if (!ssize||src==NULL)
return 0;
/* Initialize working pointers */
inb = src;
l = 0;
//triple = 0;
pos=0;
left = ssize;
/*
* Process entire inbuf.
*/
while (left != 0)
{
left--;
i = fromb64[(unsigned char)*inb];
switch(i)
{
case FAIL:
error(3, "length_base64: Illegal character: %c\n", *inb);
error(230, "length_base64: Illegal line:\n%s\n", src);
return 0;
break;
case SKIP:
break;
default:
//triple = triple<<6 | (0x3f & i);
l++;
break;
}
if (l == 4 || left == 0)
{
switch(l)
{
case 2:
//triple = triple>>4;
break;
case 3:
//triple = triple>>2;
break;
default:
break;
}
for (l -= 2; l >= 0; l--)
{
pos++;
}
//triple = 0;
l = 0;
}
inb++;
}
return pos;
}