exiv2/src/cr2image.cpp

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2012 Andreas Huggel <ahuggel@gmx.net>
 *
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
/*
  File:      cr2image.cpp
  Version:   $Rev$
  Author(s): Andreas Huggel (ahu) <ahuggel@gmx.net>
  History:   22-Apr-06, ahu: created

 */
// *****************************************************************************
#include "rcsid_int.hpp"
EXIV2_RCSID("@(#) $Id$")

// *****************************************************************************
// included header files
#ifdef _MSC_VER
# include "exv_msvc.h"
#else
# include "exv_conf.h"
#endif

#include "cr2image.hpp"
#include "cr2image_int.hpp"
#include "tiffcomposite_int.hpp"
#include "tiffimage_int.hpp"
#include "image.hpp"
#include "error.hpp"
#include "futils.hpp"
#include "i18n.h"                // NLS support.

// + standard includes
#include <iostream>
#include <iomanip>
#include <cassert>
#include <cstring>

// *****************************************************************************
// class member definitions
namespace Exiv2 {

    using namespace Internal;

    Cr2Image::Cr2Image(BasicIo::AutoPtr io, bool /*create*/)
        : Image(ImageType::cr2, mdExif | mdIptc | mdXmp, io)
    {
    } // Cr2Image::Cr2Image

    std::string Cr2Image::mimeType() const
    {
        return "image/x-canon-cr2";
    }

    int Cr2Image::pixelWidth() const
    {
        ExifData::const_iterator imageWidth = exifData_.findKey(Exiv2::ExifKey("Exif.Photo.PixelXDimension"));
        if (imageWidth != exifData_.end() && imageWidth->count() > 0) {
            return imageWidth->toLong();
        }
        return 0;
    }

    int Cr2Image::pixelHeight() const
    {
        ExifData::const_iterator imageHeight = exifData_.findKey(Exiv2::ExifKey("Exif.Photo.PixelYDimension"));
        if (imageHeight != exifData_.end() && imageHeight->count() > 0) {
            return imageHeight->toLong();
        }
        return 0;
    }

    void Cr2Image::setComment(const std::string& /*comment*/)
    {
        // not supported
        throw(Error(32, "Image comment", "CR2"));
    }

    void Cr2Image::readMetadata()
    {
#ifdef DEBUG
        std::cerr << "Reading CR2 file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(9, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isCr2Type(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(3, "CR2");
        }
        clearMetadata();
        ByteOrder bo = Cr2Parser::decode(exifData_,
                                         iptcData_,
                                         xmpData_,
                                         io_->mmap(),
                                         io_->size());
        setByteOrder(bo);
    } // Cr2Image::readMetadata

    void Cr2Image::writeMetadata()
    {
#ifdef DEBUG
        std::cerr << "Writing CR2 file " << io_->path() << "\n";
#endif
        ByteOrder bo = byteOrder();
        byte* pData = 0;
        long size = 0;
        IoCloser closer(*io_);
        if (io_->open() == 0) {
            // Ensure that this is the correct image type
            if (isCr2Type(*io_, false)) {
                pData = io_->mmap(true);
                size = io_->size();
                Cr2Header cr2Header;
                if (0 == cr2Header.read(pData, 16)) {
                    bo = cr2Header.byteOrder();
                }
            }
        }
        if (bo == invalidByteOrder) {
            bo = littleEndian;
        }
        setByteOrder(bo);
        Cr2Parser::encode(*io_, pData, size, bo, exifData_, iptcData_, xmpData_); // may throw
    } // Cr2Image::writeMetadata

    ByteOrder Cr2Parser::decode(
              ExifData& exifData,
              IptcData& iptcData,
              XmpData&  xmpData,
        const byte*     pData,
              uint32_t  size
    )
    {
        Cr2Header cr2Header;
        return TiffParserWorker::decode(exifData,
                                        iptcData,
                                        xmpData,
                                        pData,
                                        size,
                                        Tag::root,
                                        TiffMapping::findDecoder,
                                        &cr2Header);
    }

    WriteMethod Cr2Parser::encode(
              BasicIo&  io,
        const byte*     pData,
              uint32_t  size,
              ByteOrder byteOrder,
        const ExifData& exifData,
        const IptcData& iptcData,
        const XmpData&  xmpData
    )
    {
        // Copy to be able to modify the Exif data
        ExifData ed = exifData;

        // Delete IFDs which do not occur in TIFF images
        static const IfdId filteredIfds[] = {
            panaRawId
        };
        for (unsigned int i = 0; i < EXV_COUNTOF(filteredIfds); ++i) {
#ifdef DEBUG
            std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
#endif
            ed.erase(std::remove_if(ed.begin(),
                                    ed.end(),
                                    FindExifdatum(filteredIfds[i])),
                     ed.end());
        }

        std::auto_ptr<TiffHeaderBase> header(new Cr2Header(byteOrder));
        OffsetWriter offsetWriter;
        offsetWriter.setOrigin(OffsetWriter::cr2RawIfdOffset, Cr2Header::offset2addr(), byteOrder);
        return TiffParserWorker::encode(io,
                                        pData,
                                        size,
                                        ed,
                                        iptcData,
                                        xmpData,
                                        Tag::root,
                                        TiffMapping::findEncoder,
                                        header.get(),
                                        &offsetWriter);
    }

    // *************************************************************************
    // free functions
    Image::AutoPtr newCr2Instance(BasicIo::AutoPtr io, bool create)
    {
        Image::AutoPtr image(new Cr2Image(io, create));
        if (!image->good()) {
            image.reset();
        }
        return image;
    }

    bool isCr2Type(BasicIo& iIo, bool advance)
    {
        const int32_t len = 16;
        byte buf[len];
        iIo.read(buf, len);
        if (iIo.error() || iIo.eof()) {
            return false;
        }
        Cr2Header header;
        bool rc = header.read(buf, len);
        if (!advance || !rc) {
            iIo.seek(-len, BasicIo::cur);
        }
        return rc;
    }

}                                       // namespace Exiv2

namespace Exiv2 {
    namespace Internal {

    const char* Cr2Header::cr2sig_ = "CR\2\0";

    Cr2Header::Cr2Header(ByteOrder byteOrder)
        : TiffHeaderBase(42, 16, byteOrder, 0x00000010),
          offset2_(0x00000000)
    {
    }

    Cr2Header::~Cr2Header()
    {
    }

    bool Cr2Header::read(const byte* pData, uint32_t size)
    {
        if (size < 16) return false;

        if (pData[0] == 0x49 && pData[1] == 0x49) {
            setByteOrder(littleEndian);
        }
        else if (pData[0] == 0x4d && pData[1] == 0x4d) {
            setByteOrder(bigEndian);
        }
        else {
            return false;
        }
        if (tag() != getUShort(pData + 2, byteOrder())) return false;
        setOffset(getULong(pData + 4, byteOrder()));
        if (0 != memcmp(pData + 8, cr2sig_, 4)) return false;
        offset2_ = getULong(pData + 12, byteOrder());

        return true;
    } // Cr2Header::read

    DataBuf Cr2Header::write() const
    {
        DataBuf buf(16);
        switch (byteOrder()) {
        case littleEndian:
            buf.pData_[0] = 0x49;
            buf.pData_[1] = 0x49;
            break;
        case bigEndian:
            buf.pData_[0] = 0x4d;
            buf.pData_[1] = 0x4d;
            break;
        case asciiBytes:
        case invalidByteOrder:
            assert(false);
            break;
        }
        us2Data(buf.pData_ + 2, tag(), byteOrder());
        ul2Data(buf.pData_ + 4, 0x00000010, byteOrder());
        memcpy(buf.pData_ + 8, cr2sig_, 4);
        // Write a dummy value for the RAW IFD offset. The offset-writer is used to set this offset in a second pass.
        ul2Data(buf.pData_ + 12, 0x00000000, byteOrder());
        return buf;
    } // Cr2Header::write

    bool Cr2Header::isImageTag(uint16_t tag, IfdId group, const PrimaryGroups* /*pPrimaryGroups*/) const
    {
        // CR2 image tags are all IFD2 and IFD3 tags
        if (group == ifd2Id || group == ifd3Id) return true;
        // ...and any (IFD0) tag that is in the TIFF image tags list
        return isTiffImageTag(tag, group);
    }

}}                                      // namespace Internal, Exiv2