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/* Copyright (C) 2003 MySQL AB
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 <string.h>
#include <Base64.hpp>
static char base64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
int
base64_encode(UtilBuffer &src, BaseString &dst) {
char *s = (char *)src.get_data();
int i = 0;
while(i < src.length()) {
int c;
c = s[i++];
c <<= 8;
if(i < src.length())
c += s[i];
c <<= 8;
i++;
if(i < src.length())
c += s[i];
i++;
dst.append(base64_table[(c >> 18) & 0x3f]);
dst.append(base64_table[(c >> 12) & 0x3f]);
if(i > (src.length() + 1))
dst.append('=');
else
dst.append(base64_table[(c >> 6) & 0x3f]);
if(i > src.length())
dst.append('=');
else
dst.append(base64_table[(c >> 0) & 0x3f]);
}
return 0;
}
static inline int
pos(char c) {
return strchr(base64_table, c) - base64_table;
}
int
base64_decode(BaseString &src, UtilBuffer &dst) {
size_t size;
size = (src.length() * 3) / 4;
size_t i = 0;
const char *s = src.c_str();
while(i < size) {
int c = 0;
int mark = 0;
c += pos(*s++);
c <<= 6;
i++;
c += pos(*s++);
c <<= 6;
i++;
if(*s != '=')
c += pos(*s++);
else {
size--;
mark++;
}
c <<= 6;
i++;
if(*s != '=')
c += pos(*s++);
else {
size--;
mark++;
}
/* c <<= 6; */
i++;
char b[3];
b[0] = (c >> 16) & 0xff;
b[1] = (c >> 8) & 0xff;
b[2] = (c >> 0) & 0xff;
dst.append((void *)b, 3-mark);
}
return 0;
}
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