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/*
* Copyright (C), 2000-2007 by the monit project group.
* All Rights Reserved.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "rdup-tr.h"
#include "base64.h"
/* See Section 4 of RFC 3548, be URL safe, modified by Miek Gieben, 2009 */
/* Private prototypes */
static int is_base64(char c);
static char encode(unsigned char u);
static unsigned char decode(char c);
/**
* Implementation of base64 encoding/decoding.
* @author Jan-Henrik Haukeland, <hauk@tildeslash.com>
* @version \$Id: base64.c,v 1.19 2007/07/25 12:54:31 hauk Exp $
*
*/
/**
* Base64 encode and return size data in 'src'. The caller must free the
* returned string.
* @param size The size of the data in src
* @param src The data to be base64 encode
* @return encoded string otherwise NULL
*/
char
*encode_base64(int size, unsigned char *src)
{
int i;
char *out, *p;
if(!src)
return NULL;
if(!size)
size= strlen((char *)src);
out = g_malloc0(size*4/3+4);
p = out;
for(i=0; i<size; i+=3) {
unsigned char b1=0, b2=0, b3=0, b4=0, b5=0, b6=0, b7=0;
b1 = src[i];
if(i+1<size)
b2 = src[i+1];
if(i+2<size)
b3 = src[i+2];
b4= b1>>2;
b5= ((b1&0x3)<<4)|(b2>>4);
b6= ((b2&0xf)<<2)|(b3>>6);
b7= b3&0x3f;
*p++= encode(b4);
*p++= encode(b5);
if(i+1<size) {
*p++= encode(b6);
} else {
*p++= '=';
}
if(i+2<size) {
*p++= encode(b7);
} else {
*p++= '=';
}
}
return out;
}
/**
* Decode the base64 encoded string 'src' into the memory pointed to by
* 'dest'. The dest buffer is <b>not</b> NUL terminated.
* @param dest Pointer to memory for holding the decoded string.
* Must be large enough to recieve the decoded string.
* @param src A base64 encoded string.
* @return (the length of the decoded string) if decode
* succeeded otherwise FALSE.
*/
int
decode_base64(unsigned char *dest, const char *src)
{
if(src && *src) {
unsigned char *p= dest;
int k, l= strlen(src)+1;
unsigned char *buf= g_malloc0(l);
/* Ignore non base64 chars as per the POSIX standard */
for(k=0, l=0; src[k]; k++) {
if(is_base64(src[k])) {
buf[l++]= src[k];
}
}
for(k=0; k<l; k+=4) {
char c1='A', c2='A', c3='A', c4='A';
unsigned char b1=0, b2=0, b3=0, b4=0;
c1= buf[k];
if(k+1<l) {
c2= buf[k+1];
}
if(k+2<l) {
c3= buf[k+2];
}
if(k+3<l) {
c4= buf[k+3];
}
b1= decode(c1);
b2= decode(c2);
b3= decode(c3);
b4= decode(c4);
*p++=((b1<<2)|(b2>>4) );
if(c3 != '=') {
*p++=(((b2&0xf)<<4)|(b3>>2) );
}
if(c4 != '=') {
*p++=(((b3&0x3)<<6)|b4 );
}
}
g_free(buf);
return(p-dest);
}
return FALSE;
}
/**
* Base64 encode one byte
*/
static char
encode(unsigned char u)
{
if(u < 26) return 'A'+u;
if(u < 52) return 'a'+(u-26);
if(u < 62) return '0'+(u-52);
if(u == 62) return '-'; /* was + */
/* return '/'; */
return '_';
}
/**
* Decode a base64 character
*/
static unsigned char
decode(char c)
{
if(c >= 'A' && c <= 'Z') return(c - 'A');
if(c >= 'a' && c <= 'z') return(c - 'a' + 26);
if(c >= '0' && c <= '9') return(c - '0' + 52);
if(c == '-') return 62; /* was '+' */
return 63;
}
/**
* Return TRUE if 'c' is a valid base64 character, otherwise FALSE
*/
static int
is_base64(char c)
{
if((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') || (c == '-') ||
(c == '_') || (c == '=')) {
return TRUE;
}
return FALSE;
}
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