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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 "Exif.hxx"
Exif::Exif() :
maOrientation(TOP_LEFT),
mbExifPresent(false)
{}
Exif::~Exif()
{}
Orientation Exif::getOrientation() {
return maOrientation;
}
void Exif::setOrientation(Orientation aOrientation) {
maOrientation = aOrientation;
}
Orientation Exif::convertToOrientation(sal_Int32 value)
{
switch(value) {
case 1: return TOP_LEFT;
case 2: return TOP_RIGHT;
case 3: return BOTTOM_RIGHT;
case 4: return BOTTOM_LEFT;
case 5: return LEFT_TOP;
case 6: return RIGHT_TOP;
case 7: return RIGHT_BOTTOM;
case 8: return LEFT_BOTTOM;
}
return TOP_LEFT;
}
sal_Int32 Exif::getRotation()
{
switch(maOrientation) {
case TOP_LEFT:
return 0;
case BOTTOM_RIGHT:
return 1800;
case RIGHT_TOP:
return 2700;
case LEFT_BOTTOM:
return 900;
default:
break;
}
return 0;
}
bool Exif::hasExif()
{
return mbExifPresent;
}
bool Exif::read(SvStream& rStream)
{
sal_Int32 nStreamPosition = rStream.Tell();
bool result = processJpeg(rStream, false);
rStream.Seek( nStreamPosition );
return result;
}
bool Exif::write(SvStream& rStream)
{
sal_Int32 nStreamPosition = rStream.Tell();
bool result = processJpeg(rStream, true);
rStream.Seek( nStreamPosition );
return result;
}
bool Exif::processJpeg(SvStream& rStream, bool bSetValue)
{
sal_uInt16 aMagic16;
sal_uInt16 aLength;
rStream.Seek(STREAM_SEEK_TO_END);
sal_uInt32 aSize = rStream.Tell();
rStream.Seek(STREAM_SEEK_TO_BEGIN);
rStream.SetNumberFormatInt( NUMBERFORMAT_INT_BIGENDIAN );
rStream >> aMagic16;
// Compare JPEG magic bytes
if( 0xFFD8 != aMagic16 )
{
return false;
}
sal_uInt32 aPreviousPosition = STREAM_SEEK_TO_BEGIN;
while(true)
{
sal_uInt8 aMarker = 0xD9;
sal_Int32 aCount;
for (aCount = 0; aCount < 7; aCount++)
{
rStream >> aMarker;
if (aMarker != 0xFF)
{
break;
}
if (aCount >= 6)
{
return false;
}
}
rStream >> aLength;
if (aLength < 8)
{
return false;
}
if (aMarker == 0xE1)
{
return processExif(rStream, aLength, bSetValue);
}
else if (aMarker == 0xD9)
{
return false;
}
else
{
sal_uInt32 aCurrentPosition = rStream.SeekRel(aLength-1);
if (aCurrentPosition == aPreviousPosition || aCurrentPosition > aSize)
{
return false;
}
aPreviousPosition = aCurrentPosition;
}
}
return false;
}
bool Exif::processIFD(sal_uInt8* pExifData, sal_uInt16 aLength, sal_uInt16 aOffset, sal_uInt16 aNumberOfTags, bool bSetValue, bool bSwap)
{
ExifIFD* ifd = NULL;
while (aOffset <= aLength - 12 && aNumberOfTags > 0)
{
ifd = (ExifIFD*) &pExifData[aOffset];
sal_uInt16 tag = ifd->tag;
if (bSwap)
{
tag = OSL_SWAPWORD(ifd->tag);
}
if (tag == ORIENTATION)
{
if(bSetValue)
{
ifd->tag = ORIENTATION;
ifd->type = 3;
ifd->count = 1;
ifd->offset = maOrientation;
if (bSwap)
{
ifd->tag = OSL_SWAPWORD(ifd->tag);
ifd->offset = OSL_SWAPWORD(ifd->offset);
}
}
else
{
sal_uInt32 nIfdOffset = ifd->offset;
if (bSwap)
nIfdOffset = OSL_SWAPWORD(ifd->offset);
maOrientation = convertToOrientation(nIfdOffset);
}
}
aNumberOfTags--;
aOffset += 12;
}
return true;
}
bool Exif::processExif(SvStream& rStream, sal_uInt16 aSectionLength, bool bSetValue)
{
sal_uInt32 aMagic32;
sal_uInt16 aMagic16;
rStream >> aMagic32;
rStream >> aMagic16;
// Compare EXIF magic bytes
if( 0x45786966 != aMagic32 || 0x0000 != aMagic16)
{
return false;
}
sal_uInt16 aLength = aSectionLength - 6; // Length = Section - Header
sal_uInt8* aExifData = new sal_uInt8[aLength];
sal_uInt32 aExifDataBeginPosition = rStream.Tell();
rStream.Read(aExifData, aLength);
// Exif detected
mbExifPresent = true;
TiffHeader* aTiffHeader = (TiffHeader*) &aExifData[0];
bool bIntel = aTiffHeader->byteOrder == 0x4949; //big-endian
bool bMotorola = aTiffHeader->byteOrder == 0x4D4D; //little-endian
if (!bIntel && !bMotorola)
{
delete[] aExifData;
return false;
}
bool bSwap = false;
#ifdef OSL_BIGENDIAN
if (bIntel)
bSwap = true;
#else
if (bMotorola)
bSwap = true;
#endif
if (bSwap)
{
aTiffHeader->tagAlign = OSL_SWAPWORD(aTiffHeader->tagAlign);
aTiffHeader->offset = OSL_SWAPDWORD(aTiffHeader->offset);
}
if (aTiffHeader->tagAlign != 0x002A) // TIFF tag
{
delete[] aExifData;
return false;
}
sal_uInt16 aOffset = aTiffHeader->offset;
sal_uInt16 aNumberOfTags = aExifData[aOffset];
if (bSwap)
{
aNumberOfTags = ((aExifData[aOffset] << 8) | aExifData[aOffset+1]);
}
processIFD(aExifData, aLength, aOffset+2, aNumberOfTags, bSetValue, bSwap);
if (bSetValue)
{
rStream.Seek(aExifDataBeginPosition);
rStream.Write(aExifData, aLength);
}
delete[] aExifData;
return true;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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