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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://www.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: IBM Corporation
*
* Copyright: 2008 by IBM Corporation
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
/*************************************************************************
* @file
* Base64 tool.
************************************************************************/
#include <string.h>
#include "xfbase64.hxx"
const sal_Char aBase64EncodeTable[] =
{ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
/**
* @descr Encode 3 byte to 4 byte.
* Please refer to RFC to get the base64 algorithm.
*/
inline void Encode_(sal_uInt8 *src, sal_Char* dest)
{
sal_Int32 nBinaer = (((sal_uInt8)src[ 0]) << 16) +
(((sal_uInt8)src[1]) << 8) +
((sal_uInt8)src[2]);
sal_uInt8 nIndex = ((nBinaer & 0xFC0000) >> 18);
dest[0] = aBase64EncodeTable [nIndex];
nIndex = (nBinaer & 0x3F000) >> 12;
dest[1] =aBase64EncodeTable [nIndex];
nIndex = (nBinaer & 0xFC0) >> 6;
dest[2] = aBase64EncodeTable [nIndex];
nIndex = (nBinaer & 0x3F);
dest[3] = aBase64EncodeTable [nIndex];
}
/**
* @descr Base64 encode.
*/
rtl::OUString XFBase64::Encode(sal_uInt8 *buf, sal_Int32 len)
{
sal_Char *buffer;
sal_Int32 nNeeded;
sal_Int32 cycles = len/3;
sal_Int32 remain = len%3;
if( remain == 0 )
nNeeded = cycles*4;
else
nNeeded = (cycles+1)*4;
buffer = new sal_Char[nNeeded+1];
memset(buffer, 0, nNeeded+1);
for( sal_Int32 i=0; i<cycles; i++ )
Encode_(buf+i*3,buffer+i*4);
sal_uInt8 last[3];
if( remain == 1 )
{
last[0] = buf[len-1];
last[1] = last[2] = 0;
Encode_(last,buffer+nNeeded+1-5);
}
else if( remain == 2 )
{
last[0] = buf[len-2];
last[1] = buf[len-1];
last[2] = 0;
Encode_(last,buffer+nNeeded+1-5);
}
rtl::OUString str = rtl::OUString::createFromAscii(buffer);
delete[] buffer;
return str;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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