/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications, Inc.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Scott MacGregor <mscott@netscape.com>
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsOSHelperAppService_h__
#define nsOSHelperAppService_h__

// The OS helper app service is a subclass of nsExternalHelperAppService and is implemented on each
// platform. It contains platform specific code for finding helper applications for a given mime type
// in addition to launching those applications.

#include "nsExternalHelperAppService.h"
#include "nsCExternalHandlerService.h"
#include "nsCOMPtr.h"
#include <windows.h>

class nsMIMEInfoWin;

class nsOSHelperAppService : public nsExternalHelperAppService
{
public:
  nsOSHelperAppService();
  virtual ~nsOSHelperAppService();

  // override nsIExternalProtocolService methods
  nsresult OSProtocolHandlerExists(const char * aProtocolScheme, PRBool * aHandlerExists);
  nsresult LoadUriInternal(nsIURI * aURL);
  NS_IMETHOD GetApplicationDescription(const nsACString& aScheme, nsAString& _retval);

  // method overrides for windows registry look up steps....
  already_AddRefed<nsIMIMEInfo> GetMIMEInfoFromOS(const nsACString& aMIMEType, const nsACString& aFileExt, PRBool *aFound);
  NS_IMETHOD GetProtocolHandlerInfoFromOS(const nsACString &aScheme, 
                                          PRBool *found,
                                          nsIHandlerInfo **_retval);

  /** Get the string value of a registry value and store it in result.
   * @return PR_TRUE on success, PR_FALSE on failure
   */
  static PRBool GetValueString(HKEY hKey, const PRUnichar* pValueName, nsAString& result);

  // Removes registry command handler parameters, quotes, and expands environment strings.
  static PRBool CleanupCmdHandlerPath(nsAString& aCommandHandler);

protected:
  nsresult GetDefaultAppInfo(const nsAString& aTypeName, nsAString& aDefaultDescription, nsIFile** aDefaultApplication);
  // Lookup a mime info by extension, using an optional type hint
  already_AddRefed<nsMIMEInfoWin> GetByExtension(const nsAFlatString& aFileExt, const char *aTypeHint = nsnull);
  nsresult FindOSMimeInfoForType(const char * aMimeContentType, nsIURI * aURI, char ** aFileExtension, nsIMIMEInfo ** aMIMEInfo);

  static nsresult GetMIMEInfoFromRegistry(const nsAFlatString& fileType, nsIMIMEInfo *pInfo);
  /// Looks up the type for the extension aExt and compares it to aType
  static PRBool typeFromExtEquals(const PRUnichar* aExt, const char *aType);
};

#endif // nsOSHelperAppService_h__
