1 files changed, 288 insertions, 0 deletions
diff --git a/vcl/source/filter/jpeg/Exif.cxx b/vcl/source/filter/jpeg/Exif.cxx
new file mode 100644
index 000000000..53b55f69a
--- /dev/null
+++ b/vcl/source/filter/jpeg/Exif.cxx
@@ -0,0 +1,288 @@
+/* -*- 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"
+#include <memory>
+#include <osl/endian.h>
+#include <tools/stream.hxx>
+
+Exif::Exif() :
+    maOrientation(exif::TOP_LEFT),
+    mbExifPresent(false)
+{}
+
+void Exif::setOrientation(exif::Orientation aOrientation) {
+    maOrientation = aOrientation;
+}
+
+exif::Orientation Exif::convertToOrientation(sal_Int32 value)
+{
+    switch(value) {
+        case 1: return exif::TOP_LEFT;
+        case 2: return exif::TOP_RIGHT;
+        case 3: return exif::BOTTOM_RIGHT;
+        case 4: return exif::BOTTOM_LEFT;
+        case 5: return exif::LEFT_TOP;
+        case 6: return exif::RIGHT_TOP;
+        case 7: return exif::RIGHT_BOTTOM;
+        case 8: return exif::LEFT_BOTTOM;
+    }
+    return exif::TOP_LEFT;
+}
+
+Degree10 Exif::getRotation() const
+{
+    switch(maOrientation) {
+        case exif::TOP_LEFT:
+            return 0_deg10;
+        case exif::BOTTOM_RIGHT:
+            return 1800_deg10;
+        case exif::RIGHT_TOP:
+            return 2700_deg10;
+        case exif::LEFT_BOTTOM:
+            return 900_deg10;
+        default:
+            break;
+    }
+    return 0_deg10;
+}
+
+bool Exif::read(SvStream& rStream)
+{
+    sal_Int32 nStreamPosition = rStream.Tell();
+    bool result = processJpeg(rStream, false);
+    rStream.Seek( nStreamPosition );
+
+    return result;
+}
+
+void Exif::write(SvStream& rStream)
+{
+    sal_Int32 nStreamPosition = rStream.Tell();
+    processJpeg(rStream, true);
+    rStream.Seek( nStreamPosition );
+}
+
+bool Exif::processJpeg(SvStream& rStream, bool bSetValue)
+{
+    sal_uInt16  aMagic16;
+    sal_uInt16  aLength;
+
+    sal_uInt32 aSize = rStream.TellEnd();
+    rStream.Seek(STREAM_SEEK_TO_BEGIN);
+
+    rStream.SetEndian( SvStreamEndian::BIG );
+    rStream.ReadUInt16( 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.ReadUChar( aMarker );
+            if (aMarker != 0xFF)
+            {
+                break;
+            }
+            if (aCount >= 6)
+            {
+                return false;
+            }
+        }
+
+        rStream.ReadUInt16( aLength );
+
+        if (aLength < 8 || aLength > rStream.remainingSize())
+        {
+            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;
+}
+
+namespace {
+
+sal_uInt16 read16(sal_uInt8 const (& data)[2], bool littleEndian) {
+    if (littleEndian) {
+        return data[0] | (sal_uInt16(data[1]) << 8);
+    } else {
+        return data[1] | (sal_uInt16(data[0]) << 8);
+    }
+}
+
+void write16(sal_uInt16 value, sal_uInt8 (& data)[2], bool littleEndian) {
+    if (littleEndian) {
+        data[0] = value & 0xFF;
+        data[1] = value >> 8;
+    } else {
+        data[1] = value & 0xFF;
+        data[0] = value >> 8;
+    }
+}
+
+void write32(sal_uInt32 value, sal_uInt8 (& data)[4], bool littleEndian) {
+    if (littleEndian) {
+        data[0] = value & 0xFF;
+        data[1] = (value >> 8) & 0xFF;
+        data[2] = (value >> 16) & 0xFF;
+        data[3] = value >> 24;
+    } else {
+        data[3] = value & 0xFF;
+        data[2] = (value >> 8) & 0xFF;
+        data[1] = (value >> 16) & 0xFF;
+        data[0] = value >> 24;
+    }
+}
+
+}
+
+void Exif::processIFD(sal_uInt8* pExifData, sal_uInt16 aLength, sal_uInt16 aOffset, sal_uInt16 aNumberOfTags, bool bSetValue, bool littleEndian)
+{
+    ExifIFD* ifd = nullptr;
+
+    while (aOffset <= aLength - 12 && aNumberOfTags > 0)
+    {
+        ifd = reinterpret_cast<ExifIFD*>(&pExifData[aOffset]);
+        sal_uInt16 tag = read16(ifd->tag, littleEndian);
+
+        if (tag == ORIENTATION)
+        {
+            if(bSetValue)
+            {
+                write16(3, ifd->type, littleEndian);
+                write32(1, ifd->count, littleEndian);
+                write16(
+                    maOrientation, reinterpret_cast<sal_uInt8 (&)[2]>(ifd->offset), littleEndian);
+            }
+            else
+            {
+                sal_uInt16 nIfdOffset = read16(
+                    reinterpret_cast<sal_uInt8 (&)[2]>(ifd->offset), littleEndian);
+                maOrientation = convertToOrientation(nIfdOffset);
+            }
+        }
+
+        aNumberOfTags--;
+        aOffset += 12;
+    }
+}
+
+bool Exif::processExif(SvStream& rStream, sal_uInt16 aSectionLength, bool bSetValue)
+{
+    sal_uInt32  aMagic32;
+    sal_uInt16  aMagic16;
+
+    rStream.ReadUInt32( aMagic32 );
+    rStream.ReadUInt16( aMagic16 );
+
+    // Compare EXIF magic bytes
+    if( 0x45786966 != aMagic32 || 0x0000 != aMagic16)
+    {
+        return false;
+    }
+
+    sal_uInt16 aLength = aSectionLength - 6; // Length = Section - Header
+
+    std::unique_ptr<sal_uInt8[]> aExifData(new sal_uInt8[aLength]);
+    sal_uInt32 aExifDataBeginPosition = rStream.Tell();
+
+    rStream.ReadBytes(aExifData.get(), aLength);
+
+    // Exif detected
+    mbExifPresent = true;
+
+    TiffHeader* aTiffHeader = reinterpret_cast<TiffHeader*>(&aExifData[0]);
+
+    bool bIntel = aTiffHeader->byteOrder == 0x4949;      //little-endian
+    bool bMotorola = aTiffHeader->byteOrder == 0x4D4D;   //big-endian
+
+    if (!bIntel && !bMotorola)
+    {
+        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
+    {
+        return false;
+    }
+
+    sal_uInt16 aOffset = aTiffHeader->offset;
+
+    sal_uInt16 aNumberOfTags = aExifData[aOffset];
+    if (bSwap)
+    {
+        aNumberOfTags = ((aExifData[aOffset] << 8) | aExifData[aOffset+1]);
+    }
+
+    processIFD(aExifData.get(), aLength, aOffset+2, aNumberOfTags, bSetValue, bIntel);
+
+    if (bSetValue)
+    {
+        rStream.Seek(aExifDataBeginPosition);
+        rStream.WriteBytes(aExifData.get(), aLength);
+    }
+
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */