/*
 * (c) Copyright Ascensio System SIA 2010-2023
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation. In accordance with
 * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
 * that Ascensio System SIA expressly excludes the warranty of non-infringement
 * of any third-party rights.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
 * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish
 * street, Riga, Latvia, EU, LV-1050.
 *
 * The  interactive user interfaces in modified source and object code versions
 * of the Program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU AGPL version 3.
 *
 * Pursuant to Section 7(b) of the License you must retain the original Product
 * logo when distributing the program. Pursuant to Section 7(e) we decline to
 * grant you any rights under trademark law for use of our trademarks.
 *
 * All the Product's GUI elements, including illustrations and icon sets, as
 * well as technical writing content are licensed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International. See the License
 * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 */
#pragma once

#if defined(_WIN32) || defined (_WIN64)
#endif

#include "../../SystemUtility/File.h"

#include <algorithm>

namespace NSWMFToImageConverter
{
	class CImageExt
	{
	public:
		LONG GetImageType(std::wstring strFile)
		{		
			NSFile::CFileBinary oFile;
			if (false == oFile.OpenFile(strFile))
			{
				oFile.CloseFile();
				return 0;
			}

			DWORD dwSize = (DWORD)oFile.GetFileSize();

			if (44 > dwSize)
			{
				return 0;
			}

			DWORD dwKey = 0;
			oFile.ReadFile((BYTE*)(&dwKey), 4);

			if (0x9AC6CDD7 == dwKey)
			{
				// placeable meta
				oFile.CloseFile();
				return 1;
			}

			if (0x00000001 == dwKey)
			{
				oFile.SetPosition(40);
				oFile.ReadFile((BYTE*)(&dwKey), 4);
				oFile.CloseFile();

				if (0x464D4520 == dwKey)
				{
					// EMF/EMF+
					return 2;
				}
				else
				{
					// 
					return 0;
				}
			}

			oFile.CloseFile();

			if (0x00090001 == dwKey)
			{
				return 1;
			}

			return 0;
		}
	};
}