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diff --git a/uriloader/exthandler/win/nsOSHelperAppService.h b/uriloader/exthandler/win/nsOSHelperAppService.h
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+++ b/uriloader/exthandler/win/nsOSHelperAppService.h
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#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>
+#include <shlobj.h>
+
+class nsMIMEInfoWin;
+class nsIMIMEInfo;
+
+class nsOSHelperAppService : public nsExternalHelperAppService {
+ public:
+ nsOSHelperAppService();
+ virtual ~nsOSHelperAppService();
+
+ // override nsIExternalProtocolService methods
+ NS_IMETHOD OSProtocolHandlerExists(const char* aProtocolScheme,
+ bool* aHandlerExists) override;
+ nsresult LoadUriInternal(nsIURI* aURL);
+ NS_IMETHOD GetApplicationDescription(const nsACString& aScheme,
+ nsAString& _retval) override;
+
+ NS_IMETHOD IsCurrentAppOSDefaultForProtocol(const nsACString& aScheme,
+ bool* _retval) override;
+
+ // method overrides for windows registry look up steps....
+ NS_IMETHOD GetMIMEInfoFromOS(const nsACString& aMIMEType,
+ const nsACString& aFileExt, bool* aFound,
+ nsIMIMEInfo** aMIMEInfo) override;
+ NS_IMETHOD UpdateDefaultAppInfo(nsIMIMEInfo* aMIMEInfo) override;
+ NS_IMETHOD GetProtocolHandlerInfoFromOS(const nsACString& aScheme,
+ bool* found,
+ nsIHandlerInfo** _retval);
+ virtual bool GetMIMETypeFromOSForExtension(const nsACString& aExtension,
+ nsACString& aMIMEType) override;
+
+ /** Get the string value of a registry value and store it in result.
+ * @return true on success, false on failure
+ */
+ static bool GetValueString(HKEY hKey, const char16_t* pValueName,
+ nsAString& result);
+
+ 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 nsString& aFileExt, const char* aTypeHint = nullptr);
+ nsresult InternalSetDefaultsOnMIME(nsMIMEInfoWin* aMIMEInfo);
+ nsresult FindOSMimeInfoForType(const char* aMimeContentType, nsIURI* aURI,
+ char** aFileExtension,
+ nsIMIMEInfo** aMIMEInfo);
+
+ static nsresult GetMIMEInfoFromRegistry(const nsString& fileType,
+ nsIMIMEInfo* pInfo);
+ /// Looks up the type for the extension aExt and compares it to aType
+ static bool typeFromExtEquals(const char16_t* aExt, const char* aType);
+
+ private:
+ IApplicationAssociationRegistration* mAppAssoc;
+};
+
+#endif // nsOSHelperAppService_h__