AOO410/main/filter/source/xsltfilter/XMLBase64Codec.cxx

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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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 // MARKER(update_precomp.py): autogen include statement, do not remove
//This file is about the conversion of the UOF v2.0 and ODF document format
#include "precompiled_filter.hxx"
#include "XMLBase64Codec.hxx"
#include <rtl/ustrbuf.hxx>
#include <osl/diagnose.h>

using namespace rtl;
using namespace osl;
using namespace com::sun::star;

namespace{

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)
	{
		sBuffer.setLength(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;
	}

	sBuffer.appendAscii("====");

	sal_uInt8 nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0000) >> 18);
	sBuffer.setCharAt(0, aBase64EncodeTable [nIndex]);

	nIndex = static_cast< sal_uInt8 >((nBinaer & 0x3F000) >> 12);
	sBuffer.setCharAt(1, aBase64EncodeTable [nIndex]);
	if (nLen == 1)
		return;

	nIndex = static_cast< sal_uInt8 >((nBinaer & 0xFC0) >> 6);
	sBuffer.setCharAt(2, aBase64EncodeTable [nIndex]);
	if (nLen == 2)
		return;

	nIndex = static_cast< sal_uInt8 >((nBinaer & 0x3F));
	sBuffer.setCharAt(3, aBase64EncodeTable [nIndex]);
}

}

namespace XSLT {
void XMLBase64Codec::encodeBase64(rtl::OUStringBuffer& aStrBuffer, const uno::Sequence < sal_Int8 >& aPass)
{
	sal_Int32 i(0);
	sal_Int32 nBufferLength(aPass.getLength());
	const sal_Int8* pBuffer = aPass.getConstArray();
	while (i < nBufferLength)
	{
		rtl::OUStringBuffer sBuffer;
		ThreeByteToFourByte ((const sal_uInt8*)pBuffer, i, nBufferLength, sBuffer);
		aStrBuffer.append(sBuffer);
		i += 3;
	}
}

const rtl::OUString s2equal(RTL_CONSTASCII_USTRINGPARAM("=="));
const rtl::OUString s1equal(RTL_CONSTASCII_USTRINGPARAM("="));
#if 0
void FourByteToThreeByte (sal_uInt8* pBuffer, sal_Int32& nLength, const sal_Int32 nStart, const rtl::OUString& sString)
{
	nLength = 0;
	sal_Int32 nLen (sString.getLength());

	if (nLen != 4)
	{
		return;
	}


	if (sString.indexOf(s2equal) == 2)
		nLength = 1;
	else if (sString.indexOf(s1equal) == 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] = (sal_uInt8)OneByte;

	if (nLength == 2)
		return;

	OneByte = static_cast< sal_uInt8 >(nBinaer & 0xFF);
	pBuffer[nStart + 2] = (sal_uInt8)OneByte;
}

void XMLBase64Codec::decodeBase64(uno::Sequence< sal_uInt8 >& 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_uInt8>(pBuffer, nSecondLength);
	delete[] pBuffer;
}
#endif

}