/* -*- 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 <vcl/graph.hxx>
#include <vcl/BitmapTools.hxx>
#include <vcl/RawBitmap.hxx>
#include <sal/log.hxx>
#include <tools/color.hxx>
#include <tools/stream.hxx>
#include <filter/RasReader.hxx>
class FilterConfigItem;
#define RAS_TYPE_OLD 0x00000000 // supported formats by this filter
#define RAS_TYPE_STANDARD 0x00000001
#define RAS_TYPE_BYTE_ENCODED 0x00000002
#define RAS_TYPE_RGB_FORMAT 0x00000003
#define RAS_COLOR_NO_MAP 0x00000000
#define RAS_COLOR_RGB_MAP 0x00000001
#define RAS_COLOR_RAW_MAP 0x00000002
#define SUNRASTER_MAGICNUMBER 0x59a66a95
//============================ RASReader ==================================
namespace {
class RASReader {
private:
SvStream& m_rRAS; // the RAS file to be read in
bool mbStatus;
sal_Int32 mnWidth, mnHeight; // image dimensions in pixels
sal_uInt16 mnDstBitsPerPix;
sal_uInt16 mnDstColors;
sal_Int32 mnDepth, mnImageDatSize, mnType;
sal_Int32 mnColorMapType, mnColorMapSize;
sal_uInt8 mnRepCount, mnRepVal; // RLE Decoding
bool ImplReadBody(vcl::bitmap::RawBitmap&, std::vector<Color> const & rvPalette);
bool ImplReadHeader();
sal_uInt8 ImplGetByte();
public:
explicit RASReader(SvStream &rRAS);
bool ReadRAS(Graphic & rGraphic);
};
}
//=================== Methods of RASReader ==============================
RASReader::RASReader(SvStream &rRAS)
: m_rRAS(rRAS)
, mbStatus(true)
, mnWidth(0)
, mnHeight(0)
, mnDstBitsPerPix(0)
, mnDstColors(0)
, mnDepth(0)
, mnImageDatSize(0)
, mnType(0)
, mnColorMapType(0)
, mnColorMapSize(0)
, mnRepCount(0)
, mnRepVal(0)
{
}
bool RASReader::ReadRAS(Graphic & rGraphic)
{
sal_uInt32 nMagicNumber;
if ( m_rRAS.GetError() )
return false;
m_rRAS.SetEndian( SvStreamEndian::BIG );
m_rRAS.ReadUInt32( nMagicNumber );
if (!m_rRAS.good() || nMagicNumber != SUNRASTER_MAGICNUMBER)
return false;
// Kopf einlesen:
mbStatus = ImplReadHeader();
if ( !mbStatus )
return false;
std::vector<Color> aPalette;
bool bOk = true;
if ( mnDstBitsPerPix <= 8 ) // pallets pictures
{
bool bPalette(false);
if ( mnColorMapType == RAS_COLOR_RAW_MAP ) // RAW color map is skipped
{
sal_uInt64 nCurPos = m_rRAS.Tell();
bOk = checkSeek(m_rRAS, nCurPos + mnColorMapSize);
}
else if ( mnColorMapType == RAS_COLOR_RGB_MAP ) // we can read out the RGB
{
mnDstColors = static_cast<sal_uInt16>( mnColorMapSize / 3 );
if ( ( 1 << mnDstBitsPerPix ) < mnDstColors )
return false;
if ( ( mnDstColors >= 2 ) && ( ( mnColorMapSize % 3 ) == 0 ) )
{
aPalette.resize(mnDstColors);
sal_uInt16 i;
sal_uInt8 nRed[256], nGreen[256], nBlue[256];
for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nRed[ i ] );
for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nGreen[ i ] );
for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nBlue[ i ] );
for ( i = 0; i < mnDstColors; i++ )
{
aPalette[i] = Color(nRed[ i ], nGreen[ i ], nBlue[ i ]);
}
bPalette = true;
}
else
return false;
}
else if ( mnColorMapType != RAS_COLOR_NO_MAP ) // everything else is not standard
return false;
if (!bPalette)
{
mnDstColors = 1 << mnDstBitsPerPix;
aPalette.resize(mnDstColors);
for ( sal_uInt16 i = 0; i < mnDstColors; i++ )
{
sal_uInt8 nCount = 255 - ( 255 * i / ( mnDstColors - 1 ) );
aPalette[i] = Color(nCount, nCount, nCount);
}
}
}
else
{
if ( mnColorMapType != RAS_COLOR_NO_MAP ) // when graphic has more than 256 colors and a color map we skip
{ // the colormap
sal_uInt64 nCurPos = m_rRAS.Tell();
bOk = checkSeek(m_rRAS, nCurPos + mnColorMapSize);
}
}
if (!bOk)
return false;
//The RLE packets are typically three bytes in size:
//The first byte is a Flag Value indicating the type of RLE packet.
//The second byte is the Run Count.
//The third byte is the Run Value.
//
//for the sake of simplicity we'll assume that RAS_TYPE_BYTE_ENCODED can
//describe data 255 times larger than the data stored
size_t nMaxCompression = mnType != RAS_TYPE_BYTE_ENCODED ? 1 : 255;
sal_Int32 nBitSize;
if (o3tl::checked_multiply<sal_Int32>(mnWidth, mnHeight, nBitSize) || o3tl::checked_multiply<sal_Int32>(nBitSize, mnDepth, nBitSize))
return false;
if (m_rRAS.remainingSize() * nMaxCompression < static_cast<sal_uInt32>(nBitSize) / 8)
return false;
vcl::bitmap::RawBitmap aBmp(Size(mnWidth, mnHeight), 24);
// read in the bitmap data
mbStatus = ImplReadBody(aBmp, aPalette);
if ( mbStatus )
rGraphic = vcl::bitmap::CreateFromData(std::move(aBmp));
return mbStatus;
}
bool RASReader::ImplReadHeader()
{
m_rRAS.ReadInt32(mnWidth).ReadInt32(mnHeight).ReadInt32(mnDepth).ReadInt32(mnImageDatSize).ReadInt32(mnType).ReadInt32(mnColorMapType).ReadInt32(mnColorMapSize);
if (!m_rRAS.good() || mnWidth <= 0 || mnHeight <= 0 || mnImageDatSize <= 0)
mbStatus = false;
switch ( mnDepth )
{
case 24 :
case 8 :
case 1 :
mnDstBitsPerPix = static_cast<sal_uInt16>(mnDepth);
break;
case 32 :
mnDstBitsPerPix = 24;
break;
default :
mbStatus = false;
}
switch ( mnType )
{
case RAS_TYPE_OLD :
case RAS_TYPE_STANDARD :
case RAS_TYPE_RGB_FORMAT :
case RAS_TYPE_BYTE_ENCODED : // this type will be supported later
break;
default:
mbStatus = false;
}
return mbStatus;
}
namespace
{
const Color& SanitizePaletteIndex(std::vector<Color> const & rvPalette, sal_uInt8 nIndex)
{
if (nIndex >= rvPalette.size())
{
auto nSanitizedIndex = nIndex % rvPalette.size();
SAL_WARN_IF(nIndex != nSanitizedIndex, "filter.ras", "invalid colormap index: "
<< static_cast<unsigned int>(nIndex) << ", colormap len is: "
<< rvPalette.size());
nIndex = nSanitizedIndex;
}
return rvPalette[nIndex];
}
}
bool RASReader::ImplReadBody(vcl::bitmap::RawBitmap& rBitmap, std::vector<Color> const & rvPalette)
{
sal_Int32 x, y;
sal_uInt8 nRed, nGreen, nBlue;
switch ( mnDstBitsPerPix )
{
case 1 :
{
sal_uInt8 nDat = 0;
for (y = 0; y < mnHeight && mbStatus; ++y)
{
for (x = 0; x < mnWidth && mbStatus; ++x)
{
if (!(x & 7))
{
nDat = ImplGetByte();
if (!m_rRAS.good())
mbStatus = false;
}
rBitmap.SetPixel(y, x, SanitizePaletteIndex(rvPalette,
sal::static_int_cast< sal_uInt8 >(
nDat >> ( ( x & 7 ) ^ 7 ))));
}
if (!( ( x - 1 ) & 0x8 ) )
{
ImplGetByte(); // WORD ALIGNMENT ???
if (!m_rRAS.good())
mbStatus = false;
}
}
break;
}
case 8 :
for (y = 0; y < mnHeight && mbStatus; ++y)
{
for (x = 0; x < mnWidth && mbStatus; ++x)
{
sal_uInt8 nDat = ImplGetByte();
rBitmap.SetPixel(y, x, SanitizePaletteIndex(rvPalette, nDat));
if (!m_rRAS.good())
mbStatus = false;
}
if ( x & 1 )
{
ImplGetByte(); // WORD ALIGNMENT ???
if (!m_rRAS.good())
mbStatus = false;
}
}
break;
case 24 :
switch ( mnDepth )
{
case 24 :
for (y = 0; y < mnHeight && mbStatus; ++y)
{
for (x = 0; x < mnWidth && mbStatus; ++x)
{
if ( mnType == RAS_TYPE_RGB_FORMAT )
{
nRed = ImplGetByte();
nGreen = ImplGetByte();
nBlue = ImplGetByte();
}
else
{
nBlue = ImplGetByte();
nGreen = ImplGetByte();
nRed = ImplGetByte();
}
rBitmap.SetPixel(y, x, Color(nRed, nGreen, nBlue));
if (!m_rRAS.good())
mbStatus = false;
}
if ( x & 1 )
{
ImplGetByte(); // WORD ALIGNMENT ???
if (!m_rRAS.good())
mbStatus = false;
}
}
break;
case 32 :
for (y = 0; y < mnHeight && mbStatus; ++y)
{
for (x = 0; x < mnWidth && mbStatus; ++x)
{
ImplGetByte(); // pad byte > nil
if ( mnType == RAS_TYPE_RGB_FORMAT )
{
nRed = ImplGetByte();
nGreen = ImplGetByte();
nBlue = ImplGetByte();
}
else
{
nBlue = ImplGetByte();
nGreen = ImplGetByte();
nRed = ImplGetByte();
}
rBitmap.SetPixel(y, x, Color(nRed, nGreen, nBlue));
if (!m_rRAS.good())
mbStatus = false;
}
}
break;
}
break;
default:
mbStatus = false;
break;
}
return mbStatus;
}
sal_uInt8 RASReader::ImplGetByte()
{
sal_uInt8 nRetVal(0);
if ( mnType != RAS_TYPE_BYTE_ENCODED )
{
m_rRAS.ReadUChar( nRetVal );
return nRetVal;
}
else
{
if ( mnRepCount )
{
mnRepCount--;
return mnRepVal;
}
else
{
m_rRAS.ReadUChar( nRetVal );
if ( nRetVal != 0x80 )
return nRetVal;
m_rRAS.ReadUChar( nRetVal );
if ( nRetVal == 0 )
return 0x80;
mnRepCount = nRetVal ;
m_rRAS.ReadUChar( mnRepVal );
return mnRepVal;
}
}
}
//================== GraphicImport - the exported function ================
bool ImportRasGraphic( SvStream & rStream, Graphic & rGraphic)
{
bool bRet = false;
try
{
RASReader aRASReader(rStream);
bRet = aRASReader.ReadRAS(rGraphic );
}
catch (...)
{
}
return bRet;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
↑ V609 Divide by zero. Denominator range [0..65534].