Mozilla/mozilla/modules/plugin/base/src/ns4xPlugin.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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
 * http://www.mozilla.org/NPL/
 *
 * 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.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

// TODO: Implement Java callbacks

#include "prtypes.h"
#include "ns4xPlugin.h"
#include "ns4xPluginInstance.h"
#include "ns4xPluginStreamListener.h"
#include "nsIServiceManager.h"

#include "nsIMemory.h"
#include "nsIPluginStreamListener.h"
#include "nsPluginsDir.h"
#include "nsPluginSafety.h"
#include "nsIPref.h"
#include "nsPluginLogging.h"

#include "nsIPluginInstancePeer2.h"
#include "nsIJSContextStack.h"

#include "nsPIPluginInstancePeer.h"
#include "nsIDOMElement.h"
#include "nsIDOMDocument.h"
#include "nsIDOMWindow.h"
#include "nsIDocument.h"
#include "nsIScriptGlobalObject.h"

#if defined(XP_MAC) || defined(XP_MACOSX)
#include <Resources.h>
#endif

//needed for nppdf plugin
#ifdef MOZ_WIDGET_GTK
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include "gtkxtbin.h"
#endif

#ifdef MOZ_WIDGET_GTK2
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include "gtk2xtbin.h"
#endif


// POST/GET stream type
enum eNPPStreamTypeInternal {
  eNPPStreamTypeInternal_Get,
  eNPPStreamTypeInternal_Post
};

////////////////////////////////////////////////////////////////////////
// CID's && IID's
static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
static NS_DEFINE_IID(kCPluginManagerCID, NS_PLUGINMANAGER_CID);
static NS_DEFINE_IID(kIPluginIID, NS_IPLUGIN_IID); 
static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIWindowlessPluginInstancePeerIID, NS_IWINDOWLESSPLUGININSTANCEPEER_IID);
static NS_DEFINE_IID(kPluginManagerCID, NS_PLUGINMANAGER_CID);
static NS_DEFINE_IID(kIPluginManagerIID, NS_IPLUGINMANAGER_IID); 
static NS_DEFINE_IID(kMemoryCID, NS_MEMORY_CID);
static NS_DEFINE_IID(kIMemoryIID, NS_IMEMORY_IID);
static NS_DEFINE_IID(kIPluginStreamListenerIID, NS_IPLUGINSTREAMLISTENER_IID);

PR_BEGIN_EXTERN_C

  ////////////////////////////////////////////////////////////////////////
  // Static stub functions that are exported to the 4.x plugin as entry
  // points via the CALLBACKS variable.
  //
  static NPError NP_EXPORT
  _requestread(NPStream *pstream, NPByteRange *rangeList);

  static NPError NP_EXPORT
  _geturlnotify(NPP npp, const char* relativeURL, const char* target, void* notifyData);

  static NPError NP_EXPORT
  _getvalue(NPP npp, NPNVariable variable, void *r_value);

  static NPError NP_EXPORT
  _setvalue(NPP npp, NPPVariable variable, void *r_value);

  static NPError NP_EXPORT
  _geturl(NPP npp, const char* relativeURL, const char* target);

  static NPError NP_EXPORT
  _posturlnotify(NPP npp, const char* relativeURL, const char *target,
                    uint32 len, const char *buf, NPBool file, void* notifyData);

  static NPError NP_EXPORT
  _posturl(NPP npp, const char* relativeURL, const char *target, uint32 len,
              const char *buf, NPBool file);

  static NPError NP_EXPORT
  _newstream(NPP npp, NPMIMEType type, const char* window, NPStream** pstream);

  static int32 NP_EXPORT
  _write(NPP npp, NPStream *pstream, int32 len, void *buffer);

  static NPError NP_EXPORT
  _destroystream(NPP npp, NPStream *pstream, NPError reason);

  static void NP_EXPORT
  _status(NPP npp, const char *message);

#if 0

  static void NP_EXPORT
  _registerwindow(NPP npp, void* window);

  static void NP_EXPORT
  _unregisterwindow(NPP npp, void* window);

  static int16 NP_EXPORT
  _allocateMenuID(NPP npp, NPBool isSubmenu);

#endif

  static void NP_EXPORT
  _memfree (void *ptr);

  static uint32 NP_EXPORT
  _memflush(uint32 size);

  static void NP_EXPORT
  _reloadplugins(NPBool reloadPages);

  static void NP_EXPORT
  _invalidaterect(NPP npp, NPRect *invalidRect);

  static void NP_EXPORT
  _invalidateregion(NPP npp, NPRegion invalidRegion);

  static void NP_EXPORT
  _forceredraw(NPP npp);

  ////////////////////////////////////////////////////////////////////////
  // Anything that returns a pointer needs to be _HERE_ for 68K Mac to
  // work.
  //

#if defined(XP_MAC) && !defined(powerc)
#pragma pointers_in_D0
#endif

  static const char* NP_EXPORT
  _useragent(NPP npp);

  static void* NP_EXPORT
  _memalloc (uint32 size);

  static JRIEnv* NP_EXPORT
  _getJavaEnv(void);

#if 1

  static jref NP_EXPORT
  _getJavaPeer(NPP npp);

  static java_lang_Class* NP_EXPORT
  _getJavaClass(void* handle);

#endif

#if defined(XP_MAC) && !defined(powerc)
#pragma pointers_in_A0
#endif

PR_END_EXTERN_C

#ifdef XP_MACOSX

static void* TV2FP(void *tvp)
{
    static uint32 glue[6] = { 0x3D800000, 0x618C0000, 0x800C0000, 0x804C0004, 0x7C0903A6, 0x4E800420 };
    uint32* newGlue = NULL;

    if (tvp != NULL) {
        newGlue = (uint32*) malloc(sizeof(glue));
        if (newGlue != NULL) {
            memcpy(newGlue, glue, sizeof(glue));
            newGlue[0] |= ((UInt32)tvp >> 16);
            newGlue[1] |= ((UInt32)tvp & 0xFFFF);
            MakeDataExecutable(newGlue, sizeof(glue));
        }
    }
    return newGlue;
}

static void* FP2TV(void *fp)
{
    void **newGlue = NULL;
    if (fp != NULL) {
        newGlue = (void**) malloc(2 * sizeof(void *));
        if (newGlue != NULL) {
            newGlue[0] = fp;
            newGlue[1] = NULL;
        }
    }
    return newGlue;
}

#else

#define TV2FP(f) (f)
#define FP2TV(f) (f)

#endif /* XP_MACOSX */

////////////////////////////////////////////////////////////////////////
// Globals
NPNetscapeFuncs ns4xPlugin::CALLBACKS;
static nsIServiceManagerObsolete* gServiceMgr = nsnull;
static nsIMemory* gMalloc = nsnull;

////////////////////////////////////////////////////////////////////////
void
ns4xPlugin::CheckClassInitialized(void)
{
  static PRBool initialized = FALSE;

  if (initialized)
    return;

  // XXX It'd be nice to make this const and initialize it statically...
  CALLBACKS.size = sizeof(CALLBACKS);
  CALLBACKS.version = (NP_VERSION_MAJOR << 8) + NP_VERSION_MINOR;
  
  CALLBACKS.geturl           = NewNPN_GetURLProc(FP2TV(_geturl));
  CALLBACKS.posturl          = NewNPN_PostURLProc(FP2TV(_posturl));
  CALLBACKS.requestread      = NewNPN_RequestReadProc(FP2TV(_requestread));
  CALLBACKS.newstream        = NewNPN_NewStreamProc(FP2TV(_newstream));
  CALLBACKS.write            = NewNPN_WriteProc(FP2TV(_write));
  CALLBACKS.destroystream    = NewNPN_DestroyStreamProc(FP2TV(_destroystream));
  CALLBACKS.status           = NewNPN_StatusProc(FP2TV(_status));
  CALLBACKS.uagent           = NewNPN_UserAgentProc(FP2TV(_useragent));
  CALLBACKS.memalloc         = NewNPN_MemAllocProc(FP2TV(_memalloc));
  CALLBACKS.memfree          = NewNPN_MemFreeProc(FP2TV(_memfree));
  CALLBACKS.memflush         = NewNPN_MemFlushProc(FP2TV(_memflush));
  CALLBACKS.reloadplugins    = NewNPN_ReloadPluginsProc(FP2TV(_reloadplugins));
  CALLBACKS.getJavaEnv       = NewNPN_GetJavaEnvProc(FP2TV(_getJavaEnv));
  CALLBACKS.getJavaPeer      = NewNPN_GetJavaPeerProc(FP2TV(_getJavaPeer));
  CALLBACKS.geturlnotify     = NewNPN_GetURLNotifyProc(FP2TV(_geturlnotify));
  CALLBACKS.posturlnotify    = NewNPN_PostURLNotifyProc(FP2TV(_posturlnotify));
  CALLBACKS.getvalue         = NewNPN_GetValueProc(FP2TV(_getvalue));
  CALLBACKS.setvalue         = NewNPN_SetValueProc(FP2TV(_setvalue));
  CALLBACKS.invalidaterect   = NewNPN_InvalidateRectProc(FP2TV(_invalidaterect));
  CALLBACKS.invalidateregion = NewNPN_InvalidateRegionProc(FP2TV(_invalidateregion));
  CALLBACKS.forceredraw      = NewNPN_ForceRedrawProc(FP2TV(_forceredraw));

  initialized = TRUE;

  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,("NPN callbacks initialized\n"));
}


////////////////////////////////////////////////////////////////////////
// nsISupports stuff
NS_IMPL_ISUPPORTS2(ns4xPlugin, nsIPlugin, nsIFactory);

ns4xPlugin::ns4xPlugin(NPPluginFuncs* callbacks, PRLibrary* aLibrary, NP_PLUGINSHUTDOWN aShutdown, nsIServiceManagerObsolete* serviceMgr)
{
  memset((void*) &fCallbacks, 0, sizeof(fCallbacks));
  gServiceMgr = serviceMgr;
  fLibrary = nsnull;

#if defined(XP_WIN)
  // On Windows (and Mac) we need to keep a direct reference to the fCallbacks and NOT
  // just copy the struct. See Bugzilla 85334

  NP_GETENTRYPOINTS pfnGetEntryPoints =
    (NP_GETENTRYPOINTS)PR_FindSymbol(aLibrary, "NP_GetEntryPoints");
  
  if (!pfnGetEntryPoints)
    return;

  fCallbacks.size = sizeof(fCallbacks);

  nsresult result = pfnGetEntryPoints(&fCallbacks);
  NS_ASSERTION( NS_OK == result,"Failed to get callbacks");

  NS_ASSERTION(HIBYTE(fCallbacks.version) >= NP_VERSION_MAJOR, "callback version is less than NP version");

  fShutdownEntry = (NP_PLUGINSHUTDOWN)PR_FindSymbol(aLibrary, "NP_Shutdown");
#elif defined(XP_MAC) && !TARGET_CARBON
  // get the main entry point
  NP_MAIN pfnMain = (NP_MAIN) PR_FindSymbol(aLibrary, "mainRD");

  if(pfnMain == NULL)
    return;

  // call into the entry point
  NPError error;
  NS_TRY_SAFE_CALL_RETURN(error, CallNPP_MainEntryProc(pfnMain, 
                                                       &(ns4xPlugin::CALLBACKS), 
                                                       &fCallbacks, 
                                                       &fShutdownEntry), aLibrary, nsnull);

  NPP_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPP MainEntryProc called, return=%d\n",error));

  if(error != NPERR_NO_ERROR || ((fCallbacks.version >> 8) < NP_VERSION_MAJOR))
    return;

#elif defined(XP_MACOSX) || (defined(XP_MAC) && TARGET_CARBON)
  // call into the entry point
  NP_MAIN pfnMain = (NP_MAIN) PR_FindSymbol(aLibrary, "main");
  
  if(pfnMain == NULL)
    return;

  NPP_ShutdownUPP pfnShutdown;
  NPPluginFuncs np_callbacks;
  memset((void*) &np_callbacks, 0, sizeof(np_callbacks));
  np_callbacks.size = sizeof(np_callbacks);
  NPError error;

  NS_TRY_SAFE_CALL_RETURN(error, CallNPP_MainEntryProc(pfnMain, 
                                                       &(ns4xPlugin::CALLBACKS), 
                                                       &np_callbacks, 
                                                       &pfnShutdown), aLibrary, nsnull);

  NPP_PLUGIN_LOG(PLUGIN_LOG_BASIC, ("NPP MainEntryProc called: return=%d\n",error));

  if(error != NPERR_NO_ERROR)
    return;

  // version is a uint16 so cast to int to avoid an invalid
  // comparison due to limited range of the data type
  int cb_version = np_callbacks.version;
  if ((cb_version >> 8) < NP_VERSION_MAJOR)
    return;

  // wrap all plugin entry points tvectors as mach-o callable function pointers.
  fCallbacks.size = sizeof(fCallbacks);
  fCallbacks.version = np_callbacks.version;
  fCallbacks.newp = (NPP_NewUPP) TV2FP(np_callbacks.newp);
  fCallbacks.destroy = (NPP_DestroyUPP) TV2FP(np_callbacks.destroy);
  fCallbacks.setwindow = (NPP_SetWindowUPP) TV2FP(np_callbacks.setwindow);
  fCallbacks.newstream = (NPP_NewStreamUPP) TV2FP(np_callbacks.newstream);
  fCallbacks.destroystream = (NPP_DestroyStreamUPP) TV2FP(np_callbacks.destroystream);
  fCallbacks.asfile = (NPP_StreamAsFileUPP) TV2FP(np_callbacks.asfile);
  fCallbacks.writeready = (NPP_WriteReadyUPP) TV2FP(np_callbacks.writeready);
  fCallbacks.write = (NPP_WriteUPP) TV2FP(np_callbacks.write);
  fCallbacks.print = (NPP_PrintUPP) TV2FP(np_callbacks.print);
  fCallbacks.event = (NPP_HandleEventUPP) TV2FP(np_callbacks.event);
  fCallbacks.urlnotify = (NPP_URLNotifyUPP) TV2FP(np_callbacks.urlnotify);
  fCallbacks.getvalue = (NPP_GetValueUPP) TV2FP(np_callbacks.getvalue);
  fCallbacks.setvalue = (NPP_SetValueUPP) TV2FP(np_callbacks.setvalue);
  fShutdownEntry = (NP_PLUGINSHUTDOWN) TV2FP(pfnShutdown);
#else // for everyone else
  memcpy((void*) &fCallbacks, (void*) callbacks, sizeof(fCallbacks));
  fShutdownEntry = aShutdown;
#endif

  fLibrary = aLibrary;
}


////////////////////////////////////////////////////////////////////////
ns4xPlugin::~ns4xPlugin(void)
{
  //reset the callbacks list
#if defined(XP_MACOSX)
  // release all wrapped plugin entry points.
  if (fCallbacks.newp)
    free(fCallbacks.newp);
  if (fCallbacks.destroy)
    free(fCallbacks.destroy);
  if (fCallbacks.setwindow)
    free(fCallbacks.setwindow);
  if (fCallbacks.newstream)
    free(fCallbacks.newstream);
  if (fCallbacks.asfile)
    free(fCallbacks.asfile);
  if (fCallbacks.writeready)
    free(fCallbacks.writeready);
  if (fCallbacks.write)
    free(fCallbacks.write);
  if (fCallbacks.print)
    free(fCallbacks.print);
  if (fCallbacks.event)
    free(fCallbacks.event);
  if (fCallbacks.urlnotify)
    free(fCallbacks.urlnotify);
  if (fCallbacks.getvalue)
    free(fCallbacks.getvalue);
  if (fCallbacks.setvalue)
    free(fCallbacks.setvalue);
#endif
  memset((void*) &fCallbacks, 0, sizeof(fCallbacks));
}


////////////////////////////////////////////////////////////////////////
void ns4xPlugin::ReleaseStatics()
{
  NS_IF_RELEASE(gMalloc);
}


#if defined(XP_MAC) || defined(XP_MACOSX)
////////////////////////////////////////////////////////////////////////
void ns4xPlugin::SetPluginRefNum(short aRefNum)
{
  fPluginRefNum = aRefNum;
}
#endif


////////////////////////////////////////////////////////////////////////
// Static factory method.
//
///CreatePlugin()
//--------------
//Handles the initialization of old, 4x style plugins.  Creates the ns4xPlugin object.
//One ns4xPlugin object exists per Plugin (not instance).

nsresult
ns4xPlugin::CreatePlugin(nsIServiceManagerObsolete* aServiceMgr,
                         const char* aFileName,
                         const char* aFullPath,
                         PRLibrary* aLibrary,
                         nsIPlugin** aResult)
{
  CheckClassInitialized();

  // set up the MemAllocator service now because it might be used by the plugin
  if (aServiceMgr != nsnull) {
    if (nsnull == gMalloc)
      aServiceMgr->GetService(kMemoryCID, kIMemoryIID, (nsISupports**)&gMalloc);
  }

#if defined(XP_UNIX) && !defined(XP_MACOSX)

  ns4xPlugin *plptr;

  NPPluginFuncs callbacks;
  memset((void*) &callbacks, 0, sizeof(callbacks));
  callbacks.size = sizeof(callbacks);

  NP_PLUGINSHUTDOWN pfnShutdown = (NP_PLUGINSHUTDOWN)PR_FindSymbol(aLibrary, "NP_Shutdown");

  // create the new plugin handler
  *aResult = plptr = new ns4xPlugin(&callbacks, aLibrary, pfnShutdown, aServiceMgr);

  if (*aResult == NULL)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult);

  if (!aFileName) //do not call NP_Initialize in this case, bug 74938
    return NS_OK;

  // we must init here because the plugin may call NPN functions
  // when we call into the NP_Initialize entry point - NPN functions
  // require that mBrowserManager be set up
  plptr->Initialize();

  NP_PLUGINUNIXINIT pfnInitialize = (NP_PLUGINUNIXINIT)PR_FindSymbol(aLibrary, "NP_Initialize");

  if (pfnInitialize == NULL)
    return NS_ERROR_UNEXPECTED; // XXX Right error?

  if (pfnInitialize(&(ns4xPlugin::CALLBACKS),&callbacks) != NS_OK)
    return NS_ERROR_UNEXPECTED;

  // now copy function table back to ns4xPlugin instance
  memcpy((void*) &(plptr->fCallbacks), (void*)&callbacks, sizeof(callbacks));
#endif

#ifdef XP_WIN
  // Note: on Windows, we must use the fCallback because plugins may change
  // the function table. The Shockwave installer makes changes in the table while running
  *aResult = new ns4xPlugin(nsnull, aLibrary, nsnull, aServiceMgr);

  if (*aResult == NULL)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult);

  // we must init here because the plugin may call NPN functions 
  // when we call into the NP_Initialize entry point - NPN functions
  // require that mBrowserManager be set up
  if (NS_FAILED((*aResult)->Initialize())) {
    NS_RELEASE(*aResult);
    return NS_ERROR_FAILURE;
  }

  // the NP_Initialize entry point was misnamed as NP_PluginInit,
  // early in plugin project development.  Its correct name is
  // documented now, and new developers expect it to work.  However,
  // I don't want to break the plugins already in the field, so
  // we'll accept either name

  NP_PLUGININIT pfnInitialize = (NP_PLUGININIT)PR_FindSymbol(aLibrary, "NP_Initialize");

  if (!pfnInitialize)
    pfnInitialize = (NP_PLUGININIT)PR_FindSymbol(aLibrary, "NP_PluginInit");

  if (pfnInitialize == NULL)
    return NS_ERROR_UNEXPECTED; // XXX Right error?

  if (pfnInitialize(&(ns4xPlugin::CALLBACKS)) != NS_OK)
    return NS_ERROR_UNEXPECTED;
#endif

#ifdef XP_OS2
  // XXX Do we need to do this on OS/2 or can we look more like Windows?
  NP_GETENTRYPOINTS pfnGetEntryPoints = (NP_GETENTRYPOINTS)PR_FindSymbol(aLibrary, "NP_GetEntryPoints");

  if (pfnGetEntryPoints == NULL)
    return NS_ERROR_FAILURE;

  NPPluginFuncs callbacks;
  memset((void*) &callbacks, 0, sizeof(callbacks));

  callbacks.size = sizeof(callbacks);

  if (pfnGetEntryPoints(&callbacks) != NS_OK)
    return NS_ERROR_FAILURE; // XXX

  if (HIBYTE(callbacks.version) < NP_VERSION_MAJOR)
    return NS_ERROR_FAILURE;

  NP_PLUGINSHUTDOWN pfnShutdown = (NP_PLUGINSHUTDOWN)PR_FindSymbol(aLibrary, "NP_Shutdown");

  // create the new plugin handler
  *aResult = new ns4xPlugin(&callbacks, aLibrary, pfnShutdown, aServiceMgr);

  if (*aResult == NULL)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult);

  // we must init here because the plugin may call NPN functions 
  // when we call into the NP_Initialize entry point - NPN functions
  // require that mBrowserManager be set up
  if (NS_FAILED((*aResult)->Initialize())) {
    NS_RELEASE(*aResult);
    return NS_ERROR_FAILURE;
  }

  // the NP_Initialize entry point was misnamed as NP_PluginInit,
  // early in plugin project development.  Its correct name is
  // documented now, and new developers expect it to work.  However,
  // I don't want to break the plugins already in the field, so
  // we'll accept either name

  NP_PLUGININIT pfnInitialize = (NP_PLUGININIT)PR_FindSymbol(aLibrary, "NP_Initialize");

  if (!pfnInitialize)
    pfnInitialize = (NP_PLUGININIT)PR_FindSymbol(aLibrary, "NP_PluginInit");

  if (pfnInitialize == NULL)
    return NS_ERROR_UNEXPECTED; // XXX Right error?

  //Fixes problem where the OS/2 native multimedia plugins weren't working
  //   on mozilla though did work on 4.x.  Problem is that they expect the
  //   current working directory to be the plugins dir.  Since these plugins
  //   are no longer maintained and they represent the majority of the OS/2
  //   plugin contingency, we'll have to make them work here.

#define MAP_DISKNUM_TO_LETTER(n) ('A' + (n - 1))
#define MAP_LETTER_TO_DISKNUM(c) (toupper(c)-'A'+1)

  unsigned long origDiskNum, pluginDiskNum, logicalDisk;

  char pluginPath[CCHMAXPATH], origPath[CCHMAXPATH];
  strcpy(pluginPath, aFileName);
  char* slash = strrchr(pluginPath, '\\');
  *slash = '\0';

  DosQueryCurrentDisk( &origDiskNum, &logicalDisk );
  pluginDiskNum = MAP_LETTER_TO_DISKNUM(pluginPath[0]);

  origPath[0] = MAP_DISKNUM_TO_LETTER(origDiskNum);
  origPath[1] = ':';
  origPath[2] = '\\';

  ULONG len = CCHMAXPATH-3;
  APIRET rc = DosQueryCurrentDir(0, &origPath[3], &len);
  NS_ASSERTION(NO_ERROR == rc,"DosQueryCurrentDir failed");

  BOOL bChangedDir = FALSE;
  BOOL bChangedDisk = FALSE;
  if (pluginDiskNum != origDiskNum) {
    rc = DosSetDefaultDisk(pluginDiskNum);
    NS_ASSERTION(NO_ERROR == rc,"DosSetDefaultDisk failed");
    bChangedDisk = TRUE;
  }

  if (stricmp(origPath, pluginPath) != 0) {
    rc = DosSetCurrentDir(pluginPath);
    NS_ASSERTION(NO_ERROR == rc,"DosSetCurrentDir failed");
    bChangedDir = TRUE;
  }

  nsresult rv = pfnInitialize(&(ns4xPlugin::CALLBACKS));

  if (bChangedDisk) {
    rc= DosSetDefaultDisk(origDiskNum);
    NS_ASSERTION(NO_ERROR == rc,"DosSetDefaultDisk failed");
  }
  if (bChangedDir) {
    rc = DosSetCurrentDir(origPath);
    NS_ASSERTION(NO_ERROR == rc,"DosSetCurrentDir failed");
  }
  
  if (!NS_SUCCEEDED(rv)) {
    return NS_ERROR_UNEXPECTED;
  }
#endif

#if defined(XP_MAC) || defined(XP_MACOSX)
  short appRefNum = ::CurResFile();
  short pluginRefNum;

  nsCOMPtr<nsILocalFile> pluginPath;
  NS_NewNativeLocalFile(nsDependentCString(aFullPath), PR_TRUE,
                        getter_AddRefs(pluginPath));

  nsPluginFile pluginFile(pluginPath);
  pluginRefNum = pluginFile.OpenPluginResource();
  if (pluginRefNum == -1)
    return NS_ERROR_FAILURE;

  ns4xPlugin* plugin = new ns4xPlugin(nsnull, aLibrary, nsnull, aServiceMgr);
  if(plugin == NULL)
    return NS_ERROR_OUT_OF_MEMORY;

  ::UseResFile(appRefNum);
  *aResult = plugin;

  NS_ADDREF(*aResult);
  if (NS_FAILED((*aResult)->Initialize())) {
    NS_RELEASE(*aResult);
    return NS_ERROR_FAILURE;
  }

  plugin->SetPluginRefNum(pluginRefNum);
#endif  // XP_MAC || XP_MACOSX

#ifdef XP_BEOS
  // I just copied UNIX version.
  // Makoto Hamanaka <VYA04230@nifty.com>

  ns4xPlugin *plptr;

  NPPluginFuncs callbacks;
  memset((void*) &callbacks, 0, sizeof(callbacks));
  callbacks.size = sizeof(callbacks);

  NP_PLUGINSHUTDOWN pfnShutdown = (NP_PLUGINSHUTDOWN)PR_FindSymbol(aLibrary, "NP_Shutdown");

  // create the new plugin handler
  *aResult = plptr = new ns4xPlugin(&callbacks, aLibrary, pfnShutdown, aServiceMgr);

  if (*aResult == NULL)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult);

  // we must init here because the plugin may call NPN functions
  // when we call into the NP_Initialize entry point - NPN functions
  // require that mBrowserManager be set up
  plptr->Initialize();

  NP_PLUGINUNIXINIT pfnInitialize = (NP_PLUGINUNIXINIT)PR_FindSymbol(aLibrary, "NP_Initialize");

  if (pfnInitialize == NULL)
    return NS_ERROR_FAILURE;

  if (pfnInitialize(&(ns4xPlugin::CALLBACKS),&callbacks) != NS_OK)
    return NS_ERROR_FAILURE;

  // now copy function table back to ns4xPlugin instance
  memcpy((void*) &(plptr->fCallbacks), (void*)&callbacks, sizeof(callbacks));
#endif

  return NS_OK;
}


////////////////////////////////////////////////////////////////////////
//CreateInstance()
//----------------
//Creates a ns4xPluginInstance object.

nsresult ns4xPlugin :: CreateInstance(nsISupports *aOuter,  
                                      const nsIID &aIID,  
                                      void **aResult)  
{
  if (aResult == NULL)
    return NS_ERROR_NULL_POINTER;

  *aResult = NULL;

  // XXX This is suspicuous!
  ns4xPluginInstance *inst = new ns4xPluginInstance(&fCallbacks, fLibrary);

  if (inst == NULL) 
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(inst);  // Stabilize

  nsresult res = inst->QueryInterface(aIID, aResult);

  NS_RELEASE(inst); // Destabilize and avoid leaks. Avoid calling delete <interface pointer>    

  return res;
}


////////////////////////////////////////////////////////////////////////
nsresult ns4xPlugin :: LockFactory(PRBool aLock)  
{  
  // Not implemented in simplest case.  
  return NS_OK;
}  


////////////////////////////////////////////////////////////////////////
NS_METHOD ns4xPlugin :: CreatePluginInstance(nsISupports *aOuter,
                                             REFNSIID    aIID, 
                                             const char  *aPluginMIMEType,
                                             void        **aResult)
{
  return CreateInstance(aOuter, aIID, aResult);
}


////////////////////////////////////////////////////////////////////////
nsresult
ns4xPlugin::Initialize(void)
{
  if (nsnull == fLibrary)
    return NS_ERROR_FAILURE;
  return NS_OK;
}


////////////////////////////////////////////////////////////////////////
nsresult
ns4xPlugin::Shutdown(void)
{
  NPP_PLUGIN_LOG(PLUGIN_LOG_BASIC, ("NPP Shutdown to be called: this=%p\n",this));

  if (nsnull != fShutdownEntry) {
#if defined(XP_MAC) || defined(XP_MACOSX)
    CallNPP_ShutdownProc(fShutdownEntry);
    ::CloseResFile(fPluginRefNum);
#else
    NS_TRY_SAFE_CALL_VOID(fShutdownEntry(), fLibrary, nsnull);
#endif

#if defined(XP_MACOSX)
    // release the wrapped plugin function.
    free(fShutdownEntry);
#endif
    fShutdownEntry = nsnull;
  }

  PLUGIN_LOG(PLUGIN_LOG_NORMAL,("4xPlugin Shutdown done, this=%p",this));
  return NS_OK;
}


////////////////////////////////////////////////////////////////////////
nsresult
ns4xPlugin::GetMIMEDescription(const char* *resultingDesc)
{
  const char* (*npGetMIMEDescription)() = (const char* (*)()) PR_FindSymbol(fLibrary, "NP_GetMIMEDescription");

  *resultingDesc = npGetMIMEDescription ? npGetMIMEDescription() : "";

  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("ns4xPlugin::GetMIMEDescription called: this=%p, result=%s\n",this, *resultingDesc));

  return NS_OK;
}


////////////////////////////////////////////////////////////////////////
nsresult
ns4xPlugin::GetValue(nsPluginVariable variable, void *value)
{
  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("ns4xPlugin::GetValue called: this=%p, variable=%d\n",this,variable));

  NPError (*npGetValue)(void*, nsPluginVariable, void*) =
    (NPError (*)(void*, nsPluginVariable, void*)) PR_FindSymbol(fLibrary, "NP_GetValue");

  if (npGetValue && NPERR_NO_ERROR == npGetValue(nsnull, variable, value)) {
    return NS_OK;
  }
  else {
    return NS_ERROR_FAILURE;
  }
}

// Create a new NPP GET or POST url stream that may have a notify callback
NPError MakeNew4xStreamInternal (NPP npp, 
                                 const char *relativeURL, 
                                 const char *target, 
                                 eNPPStreamTypeInternal type,  /* GET or POST */
                                 PRBool bDoNotify = PR_FALSE,
                                 void *notifyData = nsnull,
                                 uint32 len = 0, 
                                 const char *buf = nsnull, 
                                 NPBool file = PR_FALSE)
{
  if(!npp) return NPERR_INVALID_INSTANCE_ERROR;

  nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;

  NS_ASSERTION(inst != NULL, "null instance");
  if (inst == NULL) 
    return NPERR_INVALID_INSTANCE_ERROR;

  nsCOMPtr<nsIPluginManager> pm = do_GetService(kPluginManagerCID);
  NS_ASSERTION(pm, "failed to get plugin manager");
  if (!pm) return NPERR_GENERIC_ERROR;

  nsIPluginStreamListener* listener = nsnull;
  if(target == nsnull)
    ((ns4xPluginInstance*)inst)->NewNotifyStream(&listener, notifyData, bDoNotify, relativeURL);

  switch (type) {
  case eNPPStreamTypeInternal_Get:
    {
      if(NS_FAILED(pm->GetURL(inst, relativeURL, target, listener)))
        return NPERR_GENERIC_ERROR;
      break;
    }
  case eNPPStreamTypeInternal_Post:
    {
      if(NS_FAILED(pm->PostURL(inst, relativeURL, len, buf, file, target, listener)))
        return NPERR_GENERIC_ERROR;
      break;
    }
  default:
    NS_ASSERTION(0, "how'd I get here");
  }

  return NPERR_NO_ERROR;
}

////////////////////////////////////////////////////////////////////////
//
// Static callbacks that get routed back through the new C++ API
//

NPError NP_EXPORT
_geturl(NPP npp, const char* relativeURL, const char* target)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_GetURL: npp=%p, target=%s, url=%s\n", (void *)npp, target, relativeURL));

  return MakeNew4xStreamInternal (npp, relativeURL, target, eNPPStreamTypeInternal_Get);
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_geturlnotify(NPP npp, const char* relativeURL, const char* target, void* notifyData)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, 
    ("NPN_GetURLNotify: npp=%p, target=%s, notify=%p, url=%s\n", (void*)npp, target, notifyData, relativeURL));

  return MakeNew4xStreamInternal (npp, relativeURL, target, eNPPStreamTypeInternal_Get, PR_TRUE, notifyData);
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_posturlnotify(NPP npp, const char *relativeURL, const char *target,
               uint32 len, const char *buf, NPBool file, void *notifyData)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_PostURLNotify: npp=%p, target=%s, len=%d, file=%d, notify=%p, url=%s, buf=%s\n",
  (void*)npp, target, len, file, notifyData, relativeURL, buf));

  return MakeNew4xStreamInternal (npp, relativeURL, target, eNPPStreamTypeInternal_Post, 
                                  PR_TRUE, notifyData, len, buf, file);
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_posturl(NPP npp, const char *relativeURL, const char *target,
         uint32 len, const char *buf, NPBool file)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_PostURL: npp=%p, target=%s, file=%d, len=%d, url=%s, buf=%s\n",
  (void*)npp, target, file, len, relativeURL, buf));

 return MakeNew4xStreamInternal (npp, relativeURL, target, eNPPStreamTypeInternal_Post, 
                                 PR_FALSE, nsnull, len, buf, file);
}


////////////////////////////////////////////////////////////////////////
// A little helper class used to wrap up plugin manager streams (that is,
// streams from the plugin to the browser).

class ns4xStreamWrapper : nsISupports
{
public:
  NS_DECL_ISUPPORTS

protected:
  nsIOutputStream *fStream;
  NPStream        fNPStream;

public:
  ns4xStreamWrapper(nsIOutputStream* stream);
  ~ns4xStreamWrapper();

  void GetStream(nsIOutputStream* &result);
  NPStream* GetNPStream(void) { return &fNPStream; };
};

NS_IMPL_ISUPPORTS1(ns4xStreamWrapper, nsISupports);

ns4xStreamWrapper::ns4xStreamWrapper(nsIOutputStream* stream)
  : fStream(stream)
{
  NS_ASSERTION(stream != NULL, "bad stream");

  fStream = stream;
  NS_ADDREF(fStream);

  memset(&fNPStream, 0, sizeof(fNPStream));
  fNPStream.ndata = (void*) this;
}

ns4xStreamWrapper::~ns4xStreamWrapper(void)
{
  fStream->Close();
  NS_IF_RELEASE(fStream);
}

void
ns4xStreamWrapper::GetStream(nsIOutputStream* &result)
{
  result = fStream;
  NS_IF_ADDREF(fStream);
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_newstream(NPP npp, NPMIMEType type, const char* window, NPStream* *result)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_NewStream: npp=%p, type=%s, window=%s\n", (void*)npp, (const char *)type, window));

  NPError err = NPERR_INVALID_INSTANCE_ERROR;
  if(npp && npp->ndata) {
    nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;
    nsCOMPtr<nsIOutputStream> stream;
    nsCOMPtr<nsIPluginInstancePeer> peer;
    if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && 
      peer &&
      NS_SUCCEEDED(peer->NewStream((const char*) type, window, getter_AddRefs(stream))))
    {
      ns4xStreamWrapper* wrapper = new ns4xStreamWrapper(stream);
      if (wrapper) {
        (*result) = wrapper->GetNPStream();
        err = NPERR_NO_ERROR;
      } else {
        err = NPERR_OUT_OF_MEMORY_ERROR;
      }
    } else {
      err = NPERR_GENERIC_ERROR;
    }
  }
  return err;
}


////////////////////////////////////////////////////////////////////////
int32 NP_EXPORT
_write(NPP npp, NPStream *pstream, int32 len, void *buffer)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_Write: npp=%p, url=%s, len=%d, buffer=%s\n", (void*)npp, pstream->url, len, (char*)buffer));

  // negative return indicates failure to the plugin
  if(!npp)
    return -1;

  ns4xStreamWrapper* wrapper = (ns4xStreamWrapper*) pstream->ndata;
  NS_ASSERTION(wrapper != NULL, "null stream");

  if (wrapper == NULL)
    return -1;

  nsIOutputStream* stream;
  wrapper->GetStream(stream);

  PRUint32 count = 0;
  nsresult rv = stream->Write((char *)buffer, len, &count);
  NS_RELEASE(stream);

  if(rv != NS_OK)
    return -1;

  return (int32)count;
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_destroystream(NPP npp, NPStream *pstream, NPError reason)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_DestroyStream: npp=%p, url=%s, reason=%d\n", (void*)npp, pstream->url, (int)reason));

  if(!npp)
    return NPERR_INVALID_INSTANCE_ERROR;

  nsISupports* stream = (nsISupports*) pstream->ndata;
  nsIPluginStreamListener* listener;

  // DestroyStream can kill two kinds of streams: NPP derived and NPN derived.
  // check to see if they're trying to kill a NPP stream
  if(stream->QueryInterface(kIPluginStreamListenerIID, (void**)&listener) == NS_OK) {
    // XXX we should try to kill this listener here somehow
    NS_RELEASE(listener); 
    return NPERR_NO_ERROR;
  }

  ns4xStreamWrapper* wrapper = (ns4xStreamWrapper*) pstream->ndata;
  NS_ASSERTION(wrapper != NULL, "null wrapper");

  if (wrapper == NULL)
    return NPERR_INVALID_PARAM;

  // This will release the wrapped nsIOutputStream.
  delete wrapper;
  pstream->ndata = nsnull;
  return NPERR_NO_ERROR;
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_status(NPP npp, const char *message)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_Status: npp=%p, message=%s\n", (void*)npp, message));

  if(!npp || !npp->ndata) {
    NS_WARNING("_status: npp or npp->ndata == 0");
    return;
  }

  nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;

  nsCOMPtr<nsIPluginInstancePeer> peer;
  if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && peer) {
    peer->ShowStatus(message);
  }
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_memfree (void *ptr)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NOISY, ("NPN_MemFree: ptr=%p\n", ptr));

  if(ptr)
    gMalloc->Free(ptr);
}


////////////////////////////////////////////////////////////////////////
uint32 NP_EXPORT
_memflush(uint32 size)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NOISY, ("NPN_MemFlush: size=%d\n", size));

  gMalloc->HeapMinimize(PR_TRUE);
  return 0;
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_reloadplugins(NPBool reloadPages)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_ReloadPlugins: reloadPages=%d\n", reloadPages));
  NS_ASSERTION(gServiceMgr != NULL, "null service manager");

  if(gServiceMgr == nsnull)
    return;

  nsIPluginManager * pm;
  gServiceMgr->GetService(kPluginManagerCID, kIPluginManagerIID, (nsISupports**)&pm);

  pm->ReloadPlugins(reloadPages);

  NS_RELEASE(pm);
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_invalidaterect(NPP npp, NPRect *invalidRect)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_InvalidateRect: npp=%p, top=%d, left=%d, bottom=%d, right=%d\n",
  (void *)npp, invalidRect->top, invalidRect->left, invalidRect->bottom, invalidRect->right));

  if(!npp || !npp->ndata) {
    NS_WARNING("_invalidaterect: npp or npp->ndata == 0");
    return;
  }

  nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;

  nsCOMPtr<nsIPluginInstancePeer> peer;
  if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && peer) {
    nsCOMPtr<nsIWindowlessPluginInstancePeer> wpeer(do_QueryInterface(peer));
    if (wpeer) {
      // XXX nsRect & NPRect are structurally equivalent
      wpeer->InvalidateRect((nsPluginRect *)invalidRect);
    }
  }
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_invalidateregion(NPP npp, NPRegion invalidRegion)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL,
  ("NPN_InvalidateRegion: npp=%p, region=%p\n", (void*)npp, (void*)invalidRegion));

  if(!npp || !npp->ndata) {
    NS_WARNING("_invalidateregion: npp or npp->ndata == 0");
    return;
  }

  nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;

  nsCOMPtr<nsIPluginInstancePeer> peer;
  if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && peer) {
    nsCOMPtr<nsIWindowlessPluginInstancePeer> wpeer(do_QueryInterface(peer));
    if (wpeer) {
      // XXX nsRegion & NPRegion are typedef'd to the same thing
      wpeer->InvalidateRegion((nsPluginRegion)invalidRegion);
    }
  }
}


////////////////////////////////////////////////////////////////////////
void NP_EXPORT
_forceredraw(NPP npp)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_ForceDraw: npp=%p\n", (void*)npp));

  if(!npp || !npp->ndata) {
    NS_WARNING("_forceredraw: npp or npp->ndata == 0");
    return;
  }

  nsIPluginInstance *inst = (nsIPluginInstance *) npp->ndata;

  nsCOMPtr<nsIPluginInstancePeer> peer;
  if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && peer) {
    nsCOMPtr<nsIWindowlessPluginInstancePeer> wpeer(do_QueryInterface(peer));
    if (wpeer) {
      wpeer->ForceRedraw();
    }
  }
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_getvalue(NPP npp, NPNVariable variable, void *result)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_GetValue: npp=%p, var=%d\n", (void*)npp, (int)variable));

  nsresult res;

  switch(variable) {
#if defined(XP_UNIX) && !defined(XP_MACOSX)
  case NPNVxDisplay : {
#if defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_GTK2)
    // adobe nppdf calls XtGetApplicationNameAndClass(display, &instance, &class)
    // we have to init Xt toolkit before get XtDisplay
    // just call gtk_xtbin_new(w,0) once
    static GtkWidget *gtkXtBinHolder = 0;
    if (!gtkXtBinHolder) {
      gtkXtBinHolder = gtk_xtbin_new(GDK_ROOT_PARENT(),0);
      // it crashes on destroy, let it leak
      // gtk_widget_destroy(gtkXtBinHolder);
    }
    (*(Display **)result) =  GTK_XTBIN(gtkXtBinHolder)->xtdisplay;
    return NPERR_NO_ERROR;
#endif
    return NPERR_GENERIC_ERROR;
  }

  case NPNVxtAppContext: 
    return NPERR_GENERIC_ERROR;
#endif

#ifdef XP_PC
  case NPNVnetscapeWindow: {
    if (!npp || !npp->ndata)
      return NPERR_INVALID_INSTANCE_ERROR;

    ns4xPluginInstance *inst = (ns4xPluginInstance *) npp->ndata;

    nsCOMPtr<nsIPluginInstancePeer> peer;
    if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) &&
        peer && 
        NS_SUCCEEDED(peer->GetValue(nsPluginInstancePeerVariable_NetscapeWindow, result)))
    {
      return NPERR_NO_ERROR;
    }
    return NPERR_GENERIC_ERROR;
  }
#endif

  case NPNVjavascriptEnabledBool: {
    *(NPBool*)result = PR_FALSE; 
    nsCOMPtr<nsIPref> prefs(do_GetService(kPrefServiceCID));
    if(prefs) {
      PRBool js = PR_FALSE;;
      res = prefs->GetBoolPref("javascript.enabled", &js);
      if(NS_SUCCEEDED(res))
        *(NPBool*)result = js; 
    }
    return NPERR_NO_ERROR;
  }

  case NPNVasdEnabledBool: 
    *(NPBool*)result = FALSE; 
    return NPERR_NO_ERROR;

  case NPNVisOfflineBool: 
    *(NPBool*)result = FALSE; 
    return NPERR_NO_ERROR;

  case NPNVserviceManager: {
    nsIServiceManager * sm;
    res = NS_GetServiceManager(&sm);
    if (NS_SUCCEEDED(res)) {
      *(nsIServiceManager**)result = sm;
      return NPERR_NO_ERROR;
    } else
      return NPERR_GENERIC_ERROR;
  }

  case NPNVDOMElement: {
    ns4xPluginInstance *inst = (ns4xPluginInstance *) npp->ndata;
    NS_ENSURE_TRUE(inst, NPERR_GENERIC_ERROR);

    nsCOMPtr<nsIPluginInstancePeer> pip;
    inst->GetPeer(getter_AddRefs(pip));
    nsCOMPtr<nsIPluginTagInfo2> pti2 (do_QueryInterface(pip));
    if (pti2) {
      nsCOMPtr<nsIDOMElement> e;
      pti2->GetDOMElement(getter_AddRefs(e));
      if (e) {
        NS_ADDREF(*(nsIDOMElement**)result = e.get());
        return NPERR_NO_ERROR;
      }
    }
    return NPERR_GENERIC_ERROR;
  }

  case NPNVDOMWindow: {
    ns4xPluginInstance *inst = (ns4xPluginInstance *) npp->ndata;
    NS_ENSURE_TRUE(inst, NPERR_GENERIC_ERROR);

    nsCOMPtr<nsIPluginInstancePeer> pip;
    inst->GetPeer(getter_AddRefs(pip));
    nsCOMPtr<nsPIPluginInstancePeer> pp (do_QueryInterface(pip));
    if (pp) {
      nsCOMPtr<nsIPluginInstanceOwner> owner;
      pp->GetOwner(getter_AddRefs(owner));
      if (owner) {
        nsCOMPtr<nsIDocument> doc;
        owner->GetDocument(getter_AddRefs(doc));
        if (doc) {
          nsCOMPtr<nsIScriptGlobalObject> globalScript;
          doc->GetScriptGlobalObject(getter_AddRefs(globalScript));
          nsCOMPtr<nsIDOMWindow> domWindow (do_QueryInterface(globalScript));
          if (domWindow) {
            NS_ADDREF(*(nsIDOMWindow**)result = domWindow.get());
            return NPERR_NO_ERROR;
          }
        }
      }
    }
    return NPERR_GENERIC_ERROR;
  }
  default : return NPERR_GENERIC_ERROR;
  }
}


////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_setvalue(NPP npp, NPPVariable variable, void *result)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_SetValue: npp=%p, var=%d\n", (void*)npp, (int)variable));

  if(!npp)
    return NPERR_INVALID_INSTANCE_ERROR;

  ns4xPluginInstance *inst = (ns4xPluginInstance *) npp->ndata;
  
  NS_ASSERTION(inst != NULL, "null instance");

  if (inst == NULL)
    return NPERR_INVALID_INSTANCE_ERROR;

  switch (variable) {

    // we should keep backward compatibility with 4x where the
    // actual pointer value is checked rather than its content
    // wnen passing booleans
    case NPPVpluginWindowBool: {
      NPBool bWindowless = (result == nsnull);
      return inst->SetWindowless(bWindowless);
    }

    case NPPVpluginTransparentBool: {
      NPBool bTransparent = (result != nsnull);
      return inst->SetTransparent(bTransparent);
    }
        
    case NPPVjavascriptPushCallerBool:
      {
        nsresult rv;
        nsCOMPtr<nsIJSContextStack> contextStack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv);
        if (NS_SUCCEEDED(rv)) {
          NPBool bPushCaller = (result != nsnull);
          if (bPushCaller) {
            nsCOMPtr<nsIPluginInstancePeer> peer;
            if (NS_SUCCEEDED(inst->GetPeer(getter_AddRefs(peer))) && peer) {
              nsCOMPtr<nsIPluginInstancePeer2> peer2 = do_QueryInterface(peer, &rv);
              if (NS_SUCCEEDED(rv) && peer2) {
                JSContext *cx;
                rv = peer2->GetJSContext(&cx);
                if (NS_SUCCEEDED(rv))
                  rv = contextStack->Push(cx);
              }
            }
          } else {
            rv = contextStack->Pop(nsnull);
          }
        }
        return NS_SUCCEEDED(rv) ? NPERR_NO_ERROR : NPERR_GENERIC_ERROR;
      }
      break;
    
    case NPPVpluginKeepLibraryInMemory: {
      NPBool bCached = (result != nsnull);
      return inst->SetCached(bCached);
    }

    default:
      return NPERR_NO_ERROR;
  }
}

////////////////////////////////////////////////////////////////////////
NPError NP_EXPORT
_requestread(NPStream *pstream, NPByteRange *rangeList)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_RequestRead: stream=%p\n", (void*)pstream));

#if PLUGIN_LOGGING
  for(NPByteRange * range = rangeList; range != nsnull; range = range->next)
    PR_LOG(nsPluginLogging::gNPNLog,PLUGIN_LOG_NOISY, 
    ("%i-%i", range->offset, range->offset + range->length - 1));

  PR_LOG(nsPluginLogging::gNPNLog,PLUGIN_LOG_NOISY, ("\n\n"));
  PR_LogFlush();
#endif
  
  if(!pstream || !rangeList || !pstream->ndata)
    return NPERR_INVALID_PARAM;
  
  nsresult res = NS_OK;
  
  ns4xPluginStreamListener * streamlistener = (ns4xPluginStreamListener *)pstream->ndata;
  
  if(NS_FAILED(res))
    return NPERR_GENERIC_ERROR;
  
  nsPluginStreamType streamtype = nsPluginStreamType_Normal;
  
  streamlistener->GetStreamType(&streamtype);
  
  if(streamtype != nsPluginStreamType_Seek)
    return NPERR_STREAM_NOT_SEEKABLE;
  
  if(streamlistener->mStreamInfo)
    streamlistener->mStreamInfo->RequestRead((nsByteRange *)rangeList);
  
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////
//
// On 68K Mac (XXX still supported?), we need to make sure that the
// pointers are in D0 for the following functions that return pointers.
//

#if defined(XP_MAC) && !defined(powerc)
#pragma pointers_in_D0
#endif

////////////////////////////////////////////////////////////////////////
JRIEnv* NP_EXPORT
_getJavaEnv(void)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_GetJavaEnv\n"));
  return NULL;
}

////////////////////////////////////////////////////////////////////////
const char * NP_EXPORT
_useragent(NPP npp)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_UserAgent: npp=%p\n", (void*)npp));

  NS_ASSERTION(gServiceMgr != NULL, "null service manager");
  if (gServiceMgr == NULL)
    return NULL;
  
  char *retstr;
  
  nsIPluginManager * pm;
  gServiceMgr->GetService(kPluginManagerCID, kIPluginManagerIID, (nsISupports**)&pm);
  
  pm->UserAgent((const char **)&retstr);
  
  NS_RELEASE(pm);
  
  return retstr;
}


////////////////////////////////////////////////////////////////////////
void * NP_EXPORT
_memalloc (uint32 size)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NOISY, ("NPN_MemAlloc: size=%d\n", size));
  return gMalloc->Alloc(size);
}


////////////////////////////////////////////////////////////////////////
java_lang_Class* NP_EXPORT
_getJavaClass(void* handle)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_GetJavaClass\n"));
  return NULL;
}


////////////////////////////////////////////////////////////////////////
jref NP_EXPORT
_getJavaPeer(NPP npp)
{
  NPN_PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("NPN_GetJavaPeer: npp=%p\n", (void*)npp));
  return NULL;
}