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/usr/include/firefox-esr-52/nsIPluginHost.h is in firefox-esr-dev 52.8.1esr-1~deb8u1.

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The actual contents of the file can be viewed below.

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/*
 * DO NOT EDIT.  THIS FILE IS GENERATED FROM ../../../dist/idl/nsIPluginHost.idl
 */

#ifndef __gen_nsIPluginHost_h__
#define __gen_nsIPluginHost_h__


#ifndef __gen_nspluginroot_h__
#include "nspluginroot.h"
#endif

#ifndef __gen_nsISupports_h__
#include "nsISupports.h"
#endif

#ifndef __gen_nsIPluginTag_h__
#include "nsIPluginTag.h"
#endif

#include "js/Value.h"

/* For IDL files that don't want to include root IDL files. */
#ifndef NS_NO_VTABLE
#define NS_NO_VTABLE
#endif
#define MOZ_PLUGIN_HOST_CONTRACTID \
  "@mozilla.org/plugin/host;1"

/* starting interface:    nsIClearSiteDataCallback */
#define NS_ICLEARSITEDATACALLBACK_IID_STR "9c311778-7c2c-4ad8-b439-b8a2786a20dd"

#define NS_ICLEARSITEDATACALLBACK_IID \
  {0x9c311778, 0x7c2c, 0x4ad8, \
    { 0xb4, 0x39, 0xb8, 0xa2, 0x78, 0x6a, 0x20, 0xdd }}

class NS_NO_VTABLE nsIClearSiteDataCallback : public nsISupports {
 public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICLEARSITEDATACALLBACK_IID)

  /* void callback (in nsresult rv); */
  NS_IMETHOD Callback(nsresult rv) = 0;

};

  NS_DEFINE_STATIC_IID_ACCESSOR(nsIClearSiteDataCallback, NS_ICLEARSITEDATACALLBACK_IID)

/* Use this macro when declaring classes that implement this interface. */
#define NS_DECL_NSICLEARSITEDATACALLBACK \
  NS_IMETHOD Callback(nsresult rv) override; 

/* Use this macro when declaring the members of this interface when the
   class doesn't implement the interface. This is useful for forwarding. */
#define NS_DECL_NON_VIRTUAL_NSICLEARSITEDATACALLBACK \
  NS_METHOD Callback(nsresult rv); 

/* Use this macro to declare functions that forward the behavior of this interface to another object. */
#define NS_FORWARD_NSICLEARSITEDATACALLBACK(_to) \
  NS_IMETHOD Callback(nsresult rv) override { return _to Callback(rv); } 

/* Use this macro to declare functions that forward the behavior of this interface to another object in a safe way. */
#define NS_FORWARD_SAFE_NSICLEARSITEDATACALLBACK(_to) \
  NS_IMETHOD Callback(nsresult rv) override { return !_to ? NS_ERROR_NULL_POINTER : _to->Callback(rv); } 

#if 0
/* Use the code below as a template for the implementation class for this interface. */

/* Header file */
class nsClearSiteDataCallback : public nsIClearSiteDataCallback
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSICLEARSITEDATACALLBACK

  nsClearSiteDataCallback();

private:
  ~nsClearSiteDataCallback();

protected:
  /* additional members */
};

/* Implementation file */
NS_IMPL_ISUPPORTS(nsClearSiteDataCallback, nsIClearSiteDataCallback)

nsClearSiteDataCallback::nsClearSiteDataCallback()
{
  /* member initializers and constructor code */
}

nsClearSiteDataCallback::~nsClearSiteDataCallback()
{
  /* destructor code */
}

/* void callback (in nsresult rv); */
NS_IMETHODIMP nsClearSiteDataCallback::Callback(nsresult rv)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* End of implementation class template. */
#endif


/* starting interface:    nsIPluginHost */
#define NS_IPLUGINHOST_IID_STR "f938f5ba-7093-42cd-a559-af8039d99204"

#define NS_IPLUGINHOST_IID \
  {0xf938f5ba, 0x7093, 0x42cd, \
    { 0xa5, 0x59, 0xaf, 0x80, 0x39, 0xd9, 0x92, 0x04 }}

class NS_NO_VTABLE nsIPluginHost : public nsISupports {
 public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IPLUGINHOST_IID)

  /* void reloadPlugins (); */
  NS_IMETHOD ReloadPlugins(void) = 0;

  /* void getPluginTags ([optional] out unsigned long aPluginCount, [array, size_is (aPluginCount), retval] out nsIPluginTag aResults); */
  NS_IMETHOD GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults) = 0;

  enum {
    FLAG_CLEAR_ALL = 0U,
    FLAG_CLEAR_CACHE = 1U,
    EXCLUDE_NONE = 0U,
    EXCLUDE_DISABLED = 1U,
    EXCLUDE_FAKE = 2U
  };

  /* void clearSiteData (in nsIPluginTag plugin, in AUTF8String domain, in uint64_t flags, in int64_t maxAge, in nsIClearSiteDataCallback callback); */
  NS_IMETHOD ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback) = 0;

  /* boolean siteHasData (in nsIPluginTag plugin, in AUTF8String domain); */
  NS_IMETHOD SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval) = 0;

  /* ACString getPermissionStringForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
  NS_IMETHOD GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval) = 0;

  /* ACString getPermissionStringForTag (in nsIPluginTag tag, [optional] in uint32_t excludeFlags); */
  NS_IMETHOD GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval) = 0;

  /* nsIPluginTag getPluginTagForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
  NS_IMETHOD GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval) = 0;

  /* unsigned long getStateForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
  NS_IMETHOD GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval) = 0;

  /* uint32_t getBlocklistStateForType (in AUTF8String aMimeType, [optional] in uint32_t excludeFlags); */
  NS_IMETHOD GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval) = 0;

  /* [implicit_jscontext] nsIFakePluginTag registerFakePlugin (in jsval initDictionary); */
  NS_IMETHOD RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval) = 0;

  /* nsIFakePluginTag getFakePlugin (in AUTF8String mimeType); */
  NS_IMETHOD GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval) = 0;

  /* void unregisterFakePlugin (in AUTF8String handlerURI); */
  NS_IMETHOD UnregisterFakePlugin(const nsACString & handlerURI) = 0;

};

  NS_DEFINE_STATIC_IID_ACCESSOR(nsIPluginHost, NS_IPLUGINHOST_IID)

/* Use this macro when declaring classes that implement this interface. */
#define NS_DECL_NSIPLUGINHOST \
  NS_IMETHOD ReloadPlugins(void) override; \
  NS_IMETHOD GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults) override; \
  NS_IMETHOD ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback) override; \
  NS_IMETHOD SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval) override; \
  NS_IMETHOD GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval) override; \
  NS_IMETHOD GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval) override; \
  NS_IMETHOD GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval) override; \
  NS_IMETHOD GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval) override; \
  NS_IMETHOD GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval) override; \
  NS_IMETHOD RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval) override; \
  NS_IMETHOD GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval) override; \
  NS_IMETHOD UnregisterFakePlugin(const nsACString & handlerURI) override; 

/* Use this macro when declaring the members of this interface when the
   class doesn't implement the interface. This is useful for forwarding. */
#define NS_DECL_NON_VIRTUAL_NSIPLUGINHOST \
  NS_METHOD ReloadPlugins(void); \
  NS_METHOD GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults); \
  NS_METHOD ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback); \
  NS_METHOD SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval); \
  NS_METHOD GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval); \
  NS_METHOD GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval); \
  NS_METHOD GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval); \
  NS_METHOD GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval); \
  NS_METHOD GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval); \
  NS_METHOD RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval); \
  NS_METHOD GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval); \
  NS_METHOD UnregisterFakePlugin(const nsACString & handlerURI); 

/* Use this macro to declare functions that forward the behavior of this interface to another object. */
#define NS_FORWARD_NSIPLUGINHOST(_to) \
  NS_IMETHOD ReloadPlugins(void) override { return _to ReloadPlugins(); } \
  NS_IMETHOD GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults) override { return _to GetPluginTags(aPluginCount, aResults); } \
  NS_IMETHOD ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback) override { return _to ClearSiteData(plugin, domain, flags, maxAge, callback); } \
  NS_IMETHOD SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval) override { return _to SiteHasData(plugin, domain, _retval); } \
  NS_IMETHOD GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval) override { return _to GetPermissionStringForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval) override { return _to GetPermissionStringForTag(tag, excludeFlags, _retval); } \
  NS_IMETHOD GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval) override { return _to GetPluginTagForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval) override { return _to GetStateForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval) override { return _to GetBlocklistStateForType(aMimeType, excludeFlags, _retval); } \
  NS_IMETHOD RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval) override { return _to RegisterFakePlugin(initDictionary, cx, _retval); } \
  NS_IMETHOD GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval) override { return _to GetFakePlugin(mimeType, _retval); } \
  NS_IMETHOD UnregisterFakePlugin(const nsACString & handlerURI) override { return _to UnregisterFakePlugin(handlerURI); } 

/* Use this macro to declare functions that forward the behavior of this interface to another object in a safe way. */
#define NS_FORWARD_SAFE_NSIPLUGINHOST(_to) \
  NS_IMETHOD ReloadPlugins(void) override { return !_to ? NS_ERROR_NULL_POINTER : _to->ReloadPlugins(); } \
  NS_IMETHOD GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPluginTags(aPluginCount, aResults); } \
  NS_IMETHOD ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback) override { return !_to ? NS_ERROR_NULL_POINTER : _to->ClearSiteData(plugin, domain, flags, maxAge, callback); } \
  NS_IMETHOD SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->SiteHasData(plugin, domain, _retval); } \
  NS_IMETHOD GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPermissionStringForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPermissionStringForTag(tag, excludeFlags, _retval); } \
  NS_IMETHOD GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetPluginTagForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetStateForType(mimeType, excludeFlags, _retval); } \
  NS_IMETHOD GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetBlocklistStateForType(aMimeType, excludeFlags, _retval); } \
  NS_IMETHOD RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->RegisterFakePlugin(initDictionary, cx, _retval); } \
  NS_IMETHOD GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval) override { return !_to ? NS_ERROR_NULL_POINTER : _to->GetFakePlugin(mimeType, _retval); } \
  NS_IMETHOD UnregisterFakePlugin(const nsACString & handlerURI) override { return !_to ? NS_ERROR_NULL_POINTER : _to->UnregisterFakePlugin(handlerURI); } 

#if 0
/* Use the code below as a template for the implementation class for this interface. */

/* Header file */
class nsPluginHost : public nsIPluginHost
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIPLUGINHOST

  nsPluginHost();

private:
  ~nsPluginHost();

protected:
  /* additional members */
};

/* Implementation file */
NS_IMPL_ISUPPORTS(nsPluginHost, nsIPluginHost)

nsPluginHost::nsPluginHost()
{
  /* member initializers and constructor code */
}

nsPluginHost::~nsPluginHost()
{
  /* destructor code */
}

/* void reloadPlugins (); */
NS_IMETHODIMP nsPluginHost::ReloadPlugins()
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void getPluginTags ([optional] out unsigned long aPluginCount, [array, size_is (aPluginCount), retval] out nsIPluginTag aResults); */
NS_IMETHODIMP nsPluginHost::GetPluginTags(uint32_t *aPluginCount, nsIPluginTag * **aResults)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void clearSiteData (in nsIPluginTag plugin, in AUTF8String domain, in uint64_t flags, in int64_t maxAge, in nsIClearSiteDataCallback callback); */
NS_IMETHODIMP nsPluginHost::ClearSiteData(nsIPluginTag *plugin, const nsACString & domain, uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback *callback)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* boolean siteHasData (in nsIPluginTag plugin, in AUTF8String domain); */
NS_IMETHODIMP nsPluginHost::SiteHasData(nsIPluginTag *plugin, const nsACString & domain, bool *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* ACString getPermissionStringForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
NS_IMETHODIMP nsPluginHost::GetPermissionStringForType(const nsACString & mimeType, uint32_t excludeFlags, nsACString & _retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* ACString getPermissionStringForTag (in nsIPluginTag tag, [optional] in uint32_t excludeFlags); */
NS_IMETHODIMP nsPluginHost::GetPermissionStringForTag(nsIPluginTag *tag, uint32_t excludeFlags, nsACString & _retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* nsIPluginTag getPluginTagForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
NS_IMETHODIMP nsPluginHost::GetPluginTagForType(const nsACString & mimeType, uint32_t excludeFlags, nsIPluginTag * *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* unsigned long getStateForType (in AUTF8String mimeType, [optional] in uint32_t excludeFlags); */
NS_IMETHODIMP nsPluginHost::GetStateForType(const nsACString & mimeType, uint32_t excludeFlags, uint32_t *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* uint32_t getBlocklistStateForType (in AUTF8String aMimeType, [optional] in uint32_t excludeFlags); */
NS_IMETHODIMP nsPluginHost::GetBlocklistStateForType(const nsACString & aMimeType, uint32_t excludeFlags, uint32_t *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* [implicit_jscontext] nsIFakePluginTag registerFakePlugin (in jsval initDictionary); */
NS_IMETHODIMP nsPluginHost::RegisterFakePlugin(JS::HandleValue initDictionary, JSContext* cx, nsIFakePluginTag * *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* nsIFakePluginTag getFakePlugin (in AUTF8String mimeType); */
NS_IMETHODIMP nsPluginHost::GetFakePlugin(const nsACString & mimeType, nsIFakePluginTag * *_retval)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void unregisterFakePlugin (in AUTF8String handlerURI); */
NS_IMETHODIMP nsPluginHost::UnregisterFakePlugin(const nsACString & handlerURI)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* End of implementation class template. */
#endif


#endif /* __gen_nsIPluginHost_h__ */