exiv2/src/cr2image.hpp

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2008 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.hpp
  @brief   Class Cr2Image
  @version $Rev$
  @author  Andreas Huggel (ahu)
           <a href="mailto:ahuggel@gmx.net">ahuggel@gmx.net</a>
  @date    22-Apr-06, ahu: created
 */
#ifndef CR2IMAGE_HPP_
#define CR2IMAGE_HPP_

// *****************************************************************************
// included header files
#include "image.hpp"
#include "basicio.hpp"
#include "types.hpp"

// + standard includes
#include <string>

// *****************************************************************************
// namespace extensions
namespace Exiv2 {

// *****************************************************************************
// class definitions

    // Add CR2 to the supported image formats
    namespace ImageType {
        const int cr2 = 7;          //!< CR2 image type (see class Cr2Image)
    }

    /*!
      @brief Class to access raw Canon CR2 images.  Exif metadata
          is supported directly, IPTC is read from the Exif data, if present.
     */
    class Cr2Image : public Image {
    public:
        //! @name Creators
        //@{
        /*!
          @brief Constructor that can either open an existing CR2 image or create
              a new image from scratch. If a new image is to be created, any
              existing data is overwritten. Since the constructor can not return
              a result, callers should check the good() method after object
              construction to determine success or failure.
          @param io An auto-pointer that owns a BasicIo instance used for
              reading and writing image metadata. \b Important: The constructor
              takes ownership of the passed in BasicIo instance through the
              auto-pointer. Callers should not continue to use the BasicIo
              instance after it is passed to this method.  Use the Image::io()
              method to get a temporary reference.
          @param create Specifies if an existing image should be read (false)
              or if a new file should be created (true).
         */
        Cr2Image(BasicIo::AutoPtr io, bool create);
        //@}

        //! @name Manipulators
        //@{
        void readMetadata();
        /*!
          @brief Todo: Write metadata back to the image. This method is not
              yet implemented. Calling it will throw an Error(31).
         */
        void writeMetadata();
        /*!
          @brief Todo: Not supported yet, requires writeMetadata(). Calling 
              this function will throw an Error(32).
         */
        void setExifData(const ExifData& exifData);
        /*!
          @brief Todo: Not supported yet, requires writeMetadata(). Calling 
              this function will throw an Error(32).
         */
        void setIptcData(const IptcData& iptcData);
        /*!
          @brief Not supported. CR2 format does not contain a comment.
              Calling this function will throw an Error(32).
         */
        void setComment(const std::string& comment);
        //@}

        //! @name Accessors
        //@{
        std::string mimeType() const { return "image/x-canon-cr2"; }
        int pixelWidth() const;
        int pixelHeight() const;
        //@}

    private:
        //! @name NOT implemented
        //@{
        //! Copy constructor
        Cr2Image(const Cr2Image& rhs);
        //! Assignment operator
        Cr2Image& operator=(const Cr2Image& rhs);
        //@}

    }; // class Cr2Image

    /*!
      @brief Stateless parser class for data in CR2 format. Images use this
             class to decode and encode CR2 data.
             See class TiffParser for details.
     */
    class Cr2Parser {
    public:
        /*!
          @brief Decode metadata from a buffer \em pData of length \em size
                 with data in CR2 format to the provided metadata containers.
                 See TiffParser::decode().
        */
        static ByteOrder decode(
                  ExifData& exifData,
                  IptcData& iptcData,
                  XmpData&  xmpData,
            const byte*     pData,
                  uint32_t  size
        );
        /*!
          @brief Encode metadata from the provided metadata to CR2 format.
                 See TiffParser::encode().
        */
        static WriteMethod encode(
                  Blob&     blob,
            const byte*     pData,
                  uint32_t  size,
            const ExifData& exifData,
            const IptcData& iptcData,
            const XmpData&  xmpData
        );

    }; // class Cr2Parser

// *****************************************************************************
// template, inline and free functions

    // These could be static private functions on Image subclasses but then
    // ImageFactory needs to be made a friend.
    /*!
      @brief Create a new Cr2Image instance and return an auto-pointer to it.
             Caller owns the returned object and the auto-pointer ensures that
             it will be deleted.
     */
    Image::AutoPtr newCr2Instance(BasicIo::AutoPtr io, bool create);

    //! Check if the file iIo is a CR2 image.
    bool isCr2Type(BasicIo& iIo, bool advance);

}                                       // namespace Exiv2

#endif                                  // #ifndef CR2IMAGE_HPP_