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//=============================================================================
//
// File : UglyBase64.cpp
// Creation date : Sun Feb 6 2011 22:25:10 CEST by Fabio Bas
//
// This file is part of the KVIrc IRC client distribution
// Copyright (C) 2011 Fabio Bas (ctrlaltca at gmail dot com)
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================
#include "UglyBase64.h"
#include "KviCString.h"
#include "KviMemory.h"
namespace UglyBase64
{
static unsigned char fake_base64[] = "./0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
void byteswap_buffer(unsigned char * p, int len)
{
while(len > 0)
{
unsigned char aux = p[0];
p[0] = p[3];
p[3] = aux;
aux = p[1];
p[1] = p[2];
p[2] = aux;
p += 4;
len -= 4;
}
}
unsigned int fake_base64dec(unsigned char c)
{
static char base64unmap[255];
static bool didinit = false;
if(!didinit)
{
// initialize base64unmap
for(char & i : base64unmap)
i = 0;
for(int i = 0; i < 64; ++i)
base64unmap[fake_base64[i]] = i;
didinit = true;
}
return base64unmap[c];
}
void encode(const unsigned char * out, const int len, KviCString & szText)
{
// FIXME: this is probably needed only on LittleEndian machines!
byteswap_buffer((unsigned char *)out, len);
// da uglybase64 encoding
const unsigned char * outb = out;
const unsigned char * oute = out + len;
int ll = (len * 3) / 2;
szText.setLen(ll);
unsigned char * p = (unsigned char *)szText.ptr();
while(outb < oute)
{
quint32 * dd1 = (quint32 *)outb;
outb += 4;
quint32 * dd2 = (quint32 *)outb;
outb += 4;
*p++ = fake_base64[*dd2 & 0x3f];
*dd2 >>= 6;
*p++ = fake_base64[*dd2 & 0x3f];
*dd2 >>= 6;
*p++ = fake_base64[*dd2 & 0x3f];
*dd2 >>= 6;
*p++ = fake_base64[*dd2 & 0x3f];
*dd2 >>= 6;
*p++ = fake_base64[*dd2 & 0x3f];
*dd2 >>= 6;
*p++ = fake_base64[*dd2 & 0x3f];
*p++ = fake_base64[*dd1 & 0x3f];
*dd1 >>= 6;
*p++ = fake_base64[*dd1 & 0x3f];
*dd1 >>= 6;
*p++ = fake_base64[*dd1 & 0x3f];
*dd1 >>= 6;
*p++ = fake_base64[*dd1 & 0x3f];
*dd1 >>= 6;
*p++ = fake_base64[*dd1 & 0x3f];
*dd1 >>= 6;
*p++ = fake_base64[*dd1 & 0x3f];
}
}
void decode(KviCString & szText, unsigned char ** buf, int * len)
{
// make sure its length is multiple of 12 (eventually pad with zeroes)
if(szText.len() % 12)
{
int oldL = szText.len();
szText.setLen(szText.len() + (12 - (szText.len() % 12)));
char * padB = szText.ptr() + oldL;
char * padE = szText.ptr() + szText.len();
while(padB < padE)
*padB++ = 0;
}
*len = (int)(szText.len() * 2) / 3;
*buf = (unsigned char *)KviMemory::allocate(*len);
unsigned char * p = (unsigned char *)szText.ptr();
unsigned char * e = p + szText.len();
int i;
unsigned char * bufp = *buf;
while(p < e)
{
quint32 * dw1 = (quint32 *)bufp;
bufp += 4;
quint32 * dw2 = (quint32 *)bufp;
bufp += 4;
*dw2 = 0;
for(i = 0; i < 6; i++)
*dw2 |= (fake_base64dec(*p++)) << (i * 6);
*dw1 = 0;
for(i = 0; i < 6; i++)
*dw1 |= (fake_base64dec(*p++)) << (i * 6);
}
// FIXME: this is probably needed only on LittleEndian machines!
byteswap_buffer(*buf, *len);
}
};
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