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/*
picoweb / litheweb -- a web server and application framework
for resource constraint systems.
Copyright (C) 2012 - 2014 Wolfgang Draxinger
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "picohttp_base64.h"
void phb64encode(
phb64raw_t const raw,
size_t count,
phb64enc_t enc)
{
enc[1] = 0;
enc[3] = 0xff;
enc[2] = (count > 1) ? 0 : 0xff;
switch(count) {
default:
return;
case 3:
enc[3] = ((raw[2] & 0x3f));
enc[2] = ((raw[2] & 0xc0) >> 6);
case 2:
enc[2] |= ((raw[1] & 0x0f) << 2);
enc[1] = ((raw[1] & 0xf0) >> 4);
case 1:
enc[1] |= ((raw[0] & 0x03) << 4);
enc[0] = ((raw[0] & 0xfc) >> 2);
}
for(int i = 0; i < 4; i++) {
if( 26 > enc[i] ) {
enc[i] = enc[i] + 'A';
} else
if( 52 > enc[i] ) {
enc[i] = (enc[i]-26) + 'a';
} else
if( 62 > enc[i] ) {
enc[i] = (enc[i]-52) + '0';
} else
switch( enc[i] ) {
case 62: enc[i] = '+'; break;
case 63: enc[i] = '/'; break;
default: enc[i] = '=';
}
}
}
size_t phb64decode(
phb64enc_t const enc,
phb64raw_t raw)
{
size_t count = 3;
phb64enc_t v;
for(int i = 0; i < 4; i++) {
if( 'A' <= enc[i] && 'Z' >= enc[i] ) {
v[i] = enc[i] - 'A';
} else
if( 'a' <= enc[i] && 'z' >= enc[i] ) {
v[i] = enc[i] - 'a' + 26;
} else
if( '0' <= enc[i] && '9' >= enc[i] ) {
v[i] = enc[i] - '0' + 52;
} else
switch(enc[i]) {
case '+': v[i] = 62; break;
case '/': v[i] = 63; break;
case 0: /* slightly deviating from the RFC, but reasonable */
case '=': v[i] = 0; count--; break;
default:
return 0;
}
}
raw[0] = ((v[0] & 0x3f) << 2) | ((v[1] & 0x30) >> 4);
raw[1] = ((v[1] & 0x0f) << 4) | ((v[2] & 0x3c) >> 2);
raw[2] = ((v[2] & 0x03) << 6) | ( v[3] & 0x3f );
return count;
}
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