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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 .
*/
#include <sal/config.h>
#include <cstddef>
#include <comphelper/base64.hxx>
#include <com/sun/star/uno/Sequence.hxx>
#include <o3tl/safeint.hxx>
#include <osl/diagnose.h>
using namespace com::sun::star;
namespace comphelper {
const
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[] =
{ 62,255,255,255, 63, // 43-47
// + /
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255, // 48-63
// 0 1 2 3 4 5 6 7 8 9 =
255, 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, 25,255,255,255,255,255, // 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 }; // 112-123
// p q r s t u v w x y z
static void ThreeByteToFourByte(const sal_Int8* pBuffer, const sal_Int32 nStart, const sal_Int32 nFullLen, char* aCharBuffer)
{
sal_Int32 nLen(nFullLen - nStart);
if (nLen > 3)
nLen = 3;
if (nLen == 0)
{
return;
}
sal_Int32 nBinaer;
switch (nLen)
{
case 1:
{
nBinaer = static_cast<sal_uInt8>(pBuffer[nStart + 0]) << 16;
}
break;
case 2:
{
nBinaer = (static_cast<sal_uInt8>(pBuffer[nStart + 0]) << 16) +
(static_cast<sal_uInt8>(pBuffer[nStart + 1]) << 8);
}
break;
default:
{
nBinaer = (static_cast<sal_uInt8>(pBuffer[nStart + 0]) << 16) +
(static_cast<sal_uInt8>(pBuffer[nStart + 1]) << 8) +
static_cast<sal_uInt8>(pBuffer[nStart + 2]);
}
break;
}
aCharBuffer[0] = aCharBuffer[1] = aCharBuffer[2] = aCharBuffer[3] = '=';
sal_uInt8 nIndex (static_cast<sal_uInt8>((nBinaer & 0xFC0000) >> 18));
aCharBuffer[0] = aBase64EncodeTable [nIndex];
nIndex = static_cast<sal_uInt8>((nBinaer & 0x3F000) >> 12);
aCharBuffer[1] = aBase64EncodeTable [nIndex];
if (nLen > 1)
{
nIndex = static_cast<sal_uInt8>((nBinaer & 0xFC0) >> 6);
aCharBuffer[2] = aBase64EncodeTable [nIndex];
if (nLen > 2)
{
nIndex = static_cast<sal_uInt8>((nBinaer & 0x3F));
aCharBuffer[3] = aBase64EncodeTable [nIndex];
}
}
}
void Base64::encode(OStringBuffer& 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)
{
char aCharBuffer[4];
ThreeByteToFourByte(pBuffer, i, nBufferLength, aCharBuffer);
aStrBuffer.append(aCharBuffer, std::size(aCharBuffer));
i += 3;
}
}
void Base64::encode(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)
{
char aCharBuffer[4];
ThreeByteToFourByte(pBuffer, i, nBufferLength, aCharBuffer);
aStrBuffer.appendAscii(aCharBuffer, std::size(aCharBuffer));
i += 3;
}
}
void Base64::decode(uno::Sequence<sal_Int8>& aBuffer, std::u16string_view sBuffer)
{
std::size_t nCharsDecoded = decodeSomeChars( aBuffer, sBuffer );
OSL_ENSURE( nCharsDecoded == sBuffer.size(), "some bytes left in base64 decoding!" );
}
std::size_t Base64::decodeSomeChars(uno::Sequence<sal_Int8>& rOutBuffer, std::u16string_view rInBuffer)
{
std::size_t nInBufferLen = rInBuffer.size();
std::size_t nMinOutBufferLen = (nInBufferLen / 4) * 3;
if( o3tl::make_unsigned(rOutBuffer.getLength()) < nMinOutBufferLen )
rOutBuffer.realloc( nMinOutBufferLen );
const sal_Unicode *pInBuffer = rInBuffer.data();
sal_Int8 *pOutBuffer = rOutBuffer.getArray();
sal_Int8 *pOutBufferStart = pOutBuffer;
std::size_t nCharsDecoded = 0;
sal_uInt8 aDecodeBuffer[4];
sal_Int32 nBytesToDecode = 0;
sal_Int32 nBytesGotFromDecoding = 3;
std::size_t nInBufferPos= 0;
while( nInBufferPos < nInBufferLen )
{
sal_Unicode cChar = *pInBuffer;
if( cChar >= '+' && cChar <= 'z' )
{
sal_uInt8 nByte = aBase64DecodeTable[cChar-'+'];
if( nByte != 255 )
{
// We have found a valid character!
aDecodeBuffer[nBytesToDecode++] = nByte;
// One '=' character at the end means 2 out bytes
// Two '=' characters at the end mean 1 out bytes
if( '=' == cChar && nBytesToDecode > 2 )
nBytesGotFromDecoding--;
if( 4 == nBytesToDecode )
{
// Four characters found, so we may convert now!
sal_uInt32 nOut = (aDecodeBuffer[0] << 18) +
(aDecodeBuffer[1] << 12) +
(aDecodeBuffer[2] << 6) +
aDecodeBuffer[3];
*pOutBuffer++ = static_cast<sal_Int8>((nOut & 0xff0000) >> 16);
if( nBytesGotFromDecoding > 1 )
*pOutBuffer++ = static_cast<sal_Int8>((nOut & 0xff00) >> 8);
if( nBytesGotFromDecoding > 2 )
*pOutBuffer++ = static_cast<sal_Int8>(nOut & 0xff);
nCharsDecoded = nInBufferPos + 1;
nBytesToDecode = 0;
nBytesGotFromDecoding = 3;
}
}
else
{
nCharsDecoded++;
}
}
else
{
nCharsDecoded++;
}
nInBufferPos++;
pInBuffer++;
}
if( (pOutBuffer - pOutBufferStart) != rOutBuffer.getLength() )
rOutBuffer.realloc( pOutBuffer - pOutBufferStart );
return nCharsDecoded;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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