зеркало из https://github.com/mozilla/pjs.git
198 строки
5.5 KiB
C++
198 строки
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et :
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Plugins.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Ben Turner <bent.mozilla@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef dom_plugins_PluginIdentifierChild_h
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#define dom_plugins_PluginIdentifierChild_h
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#include "mozilla/plugins/PPluginIdentifierChild.h"
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#include "npapi.h"
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#include "npruntime.h"
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#include "nsStringGlue.h"
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namespace mozilla {
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namespace plugins {
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class PluginModuleChild;
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/**
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* Plugin identifiers may be "temporary", see the comment on the
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* PPluginIdentifier constructor for details. This means that any IPDL method
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* which receives a PPluginIdentifierChild* parameter must use StackIdentifier
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* to track it.
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*/
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class PluginIdentifierChild : public PPluginIdentifierChild
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{
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friend class PluginModuleChild;
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public:
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bool IsString()
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{
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return mIsString;
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}
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NPIdentifier ToNPIdentifier()
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{
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if (mCanonicalIdentifier) {
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return mCanonicalIdentifier;
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}
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NS_ASSERTION(mHashed, "Handing out an unhashed identifier?");
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return this;
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}
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void MakePermanent();
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class NS_STACK_CLASS StackIdentifier
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{
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public:
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StackIdentifier(PPluginIdentifierChild* actor)
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: mIdentifier(static_cast<PluginIdentifierChild*>(actor))
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{
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if (mIdentifier)
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mIdentifier->StartTemporary();
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}
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~StackIdentifier() {
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if (mIdentifier)
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mIdentifier->FinishTemporary();
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}
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PluginIdentifierChild* operator->() { return mIdentifier; }
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private:
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PluginIdentifierChild* mIdentifier;
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};
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protected:
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PluginIdentifierChild(bool aIsString)
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: mCanonicalIdentifier(NULL)
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, mHashed(false)
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, mTemporaryRefs(0)
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, mIsString(aIsString)
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{
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MOZ_COUNT_CTOR(PluginIdentifierChild);
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}
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virtual ~PluginIdentifierChild()
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{
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MOZ_COUNT_DTOR(PluginIdentifierChild);
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}
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// The following functions are implemented by the subclasses for their
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// identifier maps.
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virtual PluginIdentifierChild* GetCanonical() = 0;
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virtual void Hash() = 0;
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virtual void Unhash() = 0;
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private:
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void StartTemporary();
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void FinishTemporary();
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// There's a possibility that we already have an actor that wraps the same
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// string or int because we do all this identifier construction
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// asynchronously. In this case we need to hand out the canonical version
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// created by the child side.
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//
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// In order to deal with temporary identifiers which appear on the stack,
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// identifiers use the following state invariants:
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//
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// * mCanonicalIdentifier is non-NULL: this is a duplicate identifier, no
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// further information is necessary.
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// * mHashed is false: this identifier is a newborn, non-permanent identifier
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// * mHashed is true, mTemporaryRefs is 0: this identifier is permanent
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// * mHashed is true, mTemporaryRefs is non-0: this identifier is temporary;
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// if NPN_GetFooIdentifier is called for it, we need to retain it. If
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// all stack references are lost, unhash it because it will soon be
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// deleted.
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PluginIdentifierChild* mCanonicalIdentifier;
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bool mHashed;
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unsigned int mTemporaryRefs;
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bool mIsString;
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};
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class PluginIdentifierChildString : public PluginIdentifierChild
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{
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friend class PluginModuleChild;
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public:
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NPUTF8* ToString()
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{
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return ToNewCString(mString);
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}
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protected:
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PluginIdentifierChildString(const nsCString& aString)
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: PluginIdentifierChild(true),
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mString(aString)
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{ }
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virtual PluginIdentifierChild* GetCanonical();
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virtual void Hash();
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virtual void Unhash();
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nsCString mString;
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};
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class PluginIdentifierChildInt : public PluginIdentifierChild
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{
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friend class PluginModuleChild;
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public:
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int32_t ToInt()
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{
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return mInt;
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}
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protected:
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PluginIdentifierChildInt(int32_t aInt)
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: PluginIdentifierChild(false),
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mInt(aInt)
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{ }
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virtual PluginIdentifierChild* GetCanonical();
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virtual void Hash();
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virtual void Unhash();
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int32_t mInt;
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};
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} // namespace plugins
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} // namespace mozilla
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#endif // dom_plugins_PluginIdentifierChild_h
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