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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "Base64Codec.hxx"
#include <rtl/ustrbuf.hxx>
#include <osl/diagnose.h>
using namespace osl;
using namespace com::sun::star;
using ::rtl::OUStringBuffer;
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', '+', '/' };
const
sal_uInt8 aBase64DecodeTable[] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0-15
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16-31
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0, 63, // 32-47
// + /
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0, // 48-63
// 0 1 2 3 4 5 6 7 8 9 =
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 64-79
// A B C D E F G H I J K L M N O
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, // 80-95
// P Q R S T U V W X Y Z
0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96-111
// a b c d e f g h i j k l m n o
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0, // 112-127
// p q r s t u v w x y z
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
void ThreeByteToFourByte (const sal_uInt8* pBuffer, const sal_Int32 nStart, const sal_Int32 nFullLen, rtl::OUStringBuffer& sBuffer)
{
sal_Int32 nLen(nFullLen - nStart);
if (nLen > 3)
nLen = 3;
if (nLen == 0)
{
return;
}
sal_Int32 nBinaer;
switch (nLen)
{
case 1:
{
nBinaer = ((sal_uInt8)pBuffer[nStart + 0]) << 16;
}
break;
case 2:
{
nBinaer = (((sal_uInt8)pBuffer[nStart + 0]) << 16) +
(((sal_uInt8)pBuffer[nStart + 1]) << 8);
}
break;
default:
{
nBinaer = (((sal_uInt8)pBuffer[nStart + 0]) << 16) +
(((sal_uInt8)pBuffer[nStart + 1]) << 8) +
((sal_uInt8)pBuffer[nStart + 2]);
}
break;
}
sal_Unicode buf[] = { '=', '=', '=', '=' };
sal_uInt8 nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0000) >> 18);
buf[0] = aBase64EncodeTable [nIndex];
nIndex = static_cast< sal_uInt8 >((nBinaer & 0x3F000) >> 12);
buf[1] = aBase64EncodeTable [nIndex];
if (nLen > 1)
{
nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0) >> 6);
buf[2] = aBase64EncodeTable [nIndex];
if (nLen > 2)
{
nIndex = static_cast< sal_uInt8 >(nBinaer & 0x3F);
buf[3] = aBase64EncodeTable [nIndex];
}
}
sBuffer.append(buf, SAL_N_ELEMENTS(buf));
}
void Base64Codec::encodeBase64(rtl::OUStringBuffer& aStrBuffer, const uno::Sequence < sal_Int8 >& aPass)
{
sal_Int32 i(0);
sal_Int32 nBufferLength(aPass.getLength());
const sal_uInt8* pBuffer = reinterpret_cast< const sal_uInt8* >( aPass.getConstArray() );
while (i < nBufferLength)
{
ThreeByteToFourByte (pBuffer, i, nBufferLength, aStrBuffer);
i += 3;
}
}
void FourByteToThreeByte (sal_uInt8* pBuffer, sal_Int32& nLength, const sal_Int32 nStart, const rtl::OUString& sString)
{
nLength = 0;
sal_Int32 nLen (sString.getLength());
OSL_ASSERT( nLen == 4 );
if (nLen != 4)
return;
if (sString.indexOfAsciiL(RTL_CONSTASCII_STRINGPARAM("==")) == 2)
nLength = 1;
else if (sString.indexOf('=') == 3)
nLength = 2;
else
nLength = 3;
sal_Int32 nBinaer ((aBase64DecodeTable [sString [0]] << 18) +
(aBase64DecodeTable [sString [1]] << 12) +
(aBase64DecodeTable [sString [2]] << 6) +
(aBase64DecodeTable [sString [3]]));
sal_uInt8 OneByte = static_cast< sal_uInt8 >((nBinaer & 0xFF0000) >> 16);
pBuffer[nStart + 0] = (sal_uInt8)OneByte;
if (nLength == 1)
return;
OneByte = static_cast< sal_uInt8 >((nBinaer & 0xFF00) >> 8);
pBuffer[nStart + 1] = OneByte;
if (nLength == 2)
return;
OneByte = static_cast< sal_uInt8 >(nBinaer & 0xFF);
pBuffer[nStart + 2] = OneByte;
}
void Base64Codec::decodeBase64(uno::Sequence< sal_Int8 >& aBuffer, const rtl::OUString& sBuffer)
{
sal_Int32 nFirstLength((sBuffer.getLength() / 4) * 3);
sal_uInt8* pBuffer = new sal_uInt8[nFirstLength];
sal_Int32 nSecondLength(0);
sal_Int32 nLength(0);
sal_Int32 i = 0;
sal_Int32 k = 0;
while (i < sBuffer.getLength())
{
FourByteToThreeByte (pBuffer, nLength, k, sBuffer.copy(i, 4));
nSecondLength += nLength;
nLength = 0;
i += 4;
k += 3;
}
aBuffer = uno::Sequence<sal_Int8>( reinterpret_cast< sal_Int8* >( pBuffer ), nSecondLength );
delete[] pBuffer;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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