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/*
Miranda Scripting Plugin for Miranda-IM
Copyright 2004-2006 Piotr Pawluczuk (www.pawluczuk.info)
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 "includes.h"
#include "cBase64.h"
#define BASE64_BM 0x000000FC
static const char* base64_etable;
static unsigned char base64_dtable[256];
static bool base64_dtable_ok = false;
cBase64::cBase64()
{
if(base64_dtable_ok == false)
{
int i = 0;
memset(base64_dtable,0xAAAAAAAA,sizeof(base64_dtable));
for(const char* c = base64_etable; i<67; i++, c++){
base64_dtable[*c] = i;
}
base64_etable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\0";
base64_dtable_ok = true;
}
}
cBase64::~cBase64()
{
}
inline bool cBase64::IsValidB64(register char c)
{
return (base64_dtable[c] != 0xAA);
}
int cBase64::EncodeRAW(unsigned char* pszIn, int length)
{
m_data.close();
if(!m_data.create((length * 3) / 2)){
return 0;
}
int tocopy = 0;
int encoded = 0;
while(encoded < length)
{
QUAD q = {0};
tocopy = min(3, length - encoded);
q.size = tocopy;
memcpy(&q, pszIn + encoded, tocopy);
EncodeQuad(q);
if(!m_data.write(&q,4)){
goto Error;
}
encoded += tocopy;
}
m_data.putc(0);
return encoded;
Error:
m_data.close();
return 0;
}
int cBase64::Encode(const char* pszData)
{
return this->EncodeRAW((unsigned char*)pszData, strlen(pszData));
}
int cBase64::Decode(const char* pszIn)
{
int len = strlen(pszIn);
int done = 0;
unsigned long *quads = (unsigned long*)pszIn;
if(!len || len % 4)return 0;
for(const char* c=pszIn;*c;c++){
if(!IsValidB64(*c)){
return 0;
}
}
m_data.close();
if(!m_data.create(len / 3 + 5)){
return 0;
}
while(done < len)
{
QUAD q ={0};
q.size = 4;
q.d.bDword = *quads++;
DecodeQuad(q);
if(!m_data.write(&q.d.bDword,q.size)){
goto Error;
}
done += 4;
}
m_data.putc(0);
return 1;
Error:
m_data.close();
return 0;
}
int cBase64::GetString(char* pszOut)
{
strcpy(pszOut, (const char*)m_data.getdata());
return m_data.size();
}
int cBase64::DecodedMessageSize()
{
return m_data.size();
}
const char* cBase64::GetBuffer()
{
return (const char*)m_data.getdata();
}
void cBase64::EncodeQuad(QUAD &quad)
{
QUAD out = {0};
unsigned char tmp_2 = 0;
tmp_2 = ((quad.d.bData[0] & BASE64_BM) >> 2);
out.d.bData[0] = base64_etable[tmp_2];
tmp_2 = ((quad.d.bData[0] & 0x03) << 4) | ((quad.d.bData[1] & 0xF0) >> 4);
out.d.bData[1] = base64_etable[tmp_2];
tmp_2 = ((quad.d.bData[1] & 0x0F) << 2) | ((quad.d.bData[2] & 0xC0) >> 6);
out.d.bData[2] = base64_etable[tmp_2];
out.d.bData[3] = base64_etable[quad.d.bData[2] & 0x3F];
if(quad.size == 1)
{
out.d.bData[2] = '=';
out.d.bData[3] = '=';
}
else if(quad.size == 2)
out.d.bData[3] = '=';
out.size = 4;
quad = out;
}
void cBase64::DecodeQuad(QUAD &quad)
{
QUAD out = {0};
unsigned char tmp_0 = 0;
unsigned char tmp_1 = 0;
quad.d.bData[0] = base64_dtable[quad.d.bData[0]];
quad.d.bData[1] = base64_dtable[quad.d.bData[1]];
quad.d.bData[2] = base64_dtable[quad.d.bData[2]];
quad.d.bData[3] = base64_dtable[quad.d.bData[3]];
if(quad.d.bData[2]==0xff && quad.d.bData[3]==0xff)
out.size = 1;
else if(quad.d.bData[3] == 0xff)
out.size = 2;
else
out.size = 3;
tmp_0 = (quad.d.bData[0]) << 2;
tmp_1 = (quad.d.bData[1] & 0x30) >> 4;
out.d.bData[0] = tmp_0 | tmp_1;
if(out.size>1)
out.d.bData[1] = ((quad.d.bData[1] & 0x0f) <<4) | ((quad.d.bData[2] & 0x3C) >> 2);
if(out.size>2)
out.d.bData[2] = ((quad.d.bData[2] & 0x03) << 6) | (quad.d.bData[3] & 0x3f);
out.d.bData[out.size] = '\0';
quad = out;
}
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