jfifcontainer.h

/*
 * libopenraw - jfifcontainer.h
 *
 * Copyright (C) 2006-2007 Hubert Figuiere
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */



#ifndef _JFIFCONTAINER_H_
#define _JFIFCONTAINER_H_

#include <setjmp.h>
#include <cstdio>

namespace JPEG {
#include <jpeglib.h>
}

#include <libopenraw/types.h>
#include <libopenraw/consts.h>

#include "exception.h"
#include "rawcontainer.h"

namespace OpenRaw {

    class BitmapData;

    namespace Internals {

        class JFIFContainer
            : public RawContainer
        {
        public:
            JFIFContainer(IO::Stream *file, off_t offset);
            virtual ~JFIFContainer();

            bool getDimensions(uint32_t &x, uint32_t &y);
            bool getDecompressedData(BitmapData &data);

            /* libjpeg callbacks j_ is the prefix for these callbacks */
            static void j_init_source(JPEG::j_decompress_ptr cinfo);
            static JPEG::boolean j_fill_input_buffer(JPEG::j_decompress_ptr cinfo);
            static void j_skip_input_data(JPEG::j_decompress_ptr cinfo, 
                                                                        long num_bytes);
//          static void j_jpeg_resync_to_restart(JPEG::j_decompress_ptr cinfo);
            static void j_term_source(JPEG::j_decompress_ptr cinfo);
            static void j_error_exit(JPEG::j_common_ptr cinfo);

        private:
          int _loadHeader();

            struct JPEG::jpeg_decompress_struct m_cinfo;
            struct JPEG::jpeg_error_mgr m_jerr;
            jmp_buf m_jpegjmp;
            bool m_headerLoaded;
        };

    }
}

#endif