mirror of
https://github.com/classilla/tenfourfox.git
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335 lines
8.2 KiB
C++
335 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_plugins_MiniShmBase_h
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#define mozilla_plugins_MiniShmBase_h
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#include "base/basictypes.h"
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#include "nsDebug.h"
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#include <windows.h>
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namespace mozilla {
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namespace plugins {
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/**
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* This class is used to provide RAII semantics for mapped views.
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* @see ScopedHandle
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*/
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class ScopedMappedFileView
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{
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public:
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explicit
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ScopedMappedFileView(LPVOID aView)
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: mView(aView)
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{
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}
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~ScopedMappedFileView()
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{
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Close();
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}
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void
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Close()
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{
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if (mView) {
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::UnmapViewOfFile(mView);
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mView = nullptr;
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}
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}
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void
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Set(LPVOID aView)
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{
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Close();
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mView = aView;
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}
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LPVOID
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Get() const
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{
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return mView;
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}
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LPVOID
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Take()
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{
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LPVOID result = mView;
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mView = nullptr;
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return result;
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}
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operator LPVOID()
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{
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return mView;
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}
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bool
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IsValid() const
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{
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return (mView);
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(ScopedMappedFileView);
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LPVOID mView;
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};
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class MiniShmBase;
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class MiniShmObserver
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{
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public:
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/**
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* This function is called whenever there is a new shared memory request.
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* @param aMiniShmObj MiniShmBase object that may be used to read and
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* write from shared memory.
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*/
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virtual void OnMiniShmEvent(MiniShmBase *aMiniShmObj) = 0;
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/**
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* This function is called once when a MiniShmParent and a MiniShmChild
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* object have successfully negotiated a connection.
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*
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* @param aMiniShmObj MiniShmBase object that may be used to read and
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* write from shared memory.
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*/
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virtual void OnMiniShmConnect(MiniShmBase *aMiniShmObj) { }
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};
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/**
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* Base class for MiniShm connections. This class defines the common
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* interfaces and code between parent and child.
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*/
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class MiniShmBase
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{
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public:
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/**
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* Obtains a writable pointer into shared memory of type T.
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* typename T must be plain-old-data and contain an unsigned integral
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* member T::identifier that uniquely identifies T with respect to
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* other types used by the protocol being implemented.
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*
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* @param aPtr Pointer to receive the shared memory address.
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* This value is set if and only if the function
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* succeeded.
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* @return NS_OK if and only if aPtr was successfully obtained.
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* NS_ERROR_ILLEGAL_VALUE if type T is not valid for MiniShm.
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* NS_ERROR_NOT_INITIALIZED if there is no valid MiniShm connection.
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* NS_ERROR_NOT_AVAILABLE if the memory is not safe to write.
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*/
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template<typename T> nsresult
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GetWritePtr(T*& aPtr)
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{
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if (!mWriteHeader || !mGuard) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (sizeof(T) > mPayloadMaxLen ||
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T::identifier <= RESERVED_CODE_LAST) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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if (::WaitForSingleObject(mGuard, mTimeout) != WAIT_OBJECT_0) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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mWriteHeader->mId = T::identifier;
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mWriteHeader->mPayloadLen = sizeof(T);
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aPtr = reinterpret_cast<T*>(mWriteHeader + 1);
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return NS_OK;
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}
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/**
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* Obtains a readable pointer into shared memory of type T.
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* typename T must be plain-old-data and contain an unsigned integral
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* member T::identifier that uniquely identifies T with respect to
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* other types used by the protocol being implemented.
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*
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* @param aPtr Pointer to receive the shared memory address.
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* This value is set if and only if the function
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* succeeded.
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* @return NS_OK if and only if aPtr was successfully obtained.
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* NS_ERROR_ILLEGAL_VALUE if type T is not valid for MiniShm or if
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* type T does not match the type of the data
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* stored in shared memory.
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* NS_ERROR_NOT_INITIALIZED if there is no valid MiniShm connection.
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*/
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template<typename T> nsresult
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GetReadPtr(const T*& aPtr)
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{
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if (!mReadHeader) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (mReadHeader->mId != T::identifier ||
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sizeof(T) != mReadHeader->mPayloadLen) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aPtr = reinterpret_cast<const T*>(mReadHeader + 1);
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return NS_OK;
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}
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/**
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* Fires the peer's event causing its request handler to execute.
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*
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* @return Should return NS_OK if the send was successful.
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*/
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virtual nsresult
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Send() = 0;
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protected:
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/**
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* MiniShm reserves some identifier codes for its own use. Any
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* identifiers used by MiniShm protocol implementations must be
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* greater than RESERVED_CODE_LAST.
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*/
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enum ReservedCodes
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{
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RESERVED_CODE_INIT = 0,
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RESERVED_CODE_INIT_COMPLETE = 1,
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RESERVED_CODE_LAST = RESERVED_CODE_INIT_COMPLETE
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};
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struct MiniShmHeader
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{
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unsigned int mId;
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unsigned int mPayloadLen;
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};
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struct MiniShmInit
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{
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enum identifier_t
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{
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identifier = RESERVED_CODE_INIT
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};
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HANDLE mParentEvent;
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HANDLE mParentGuard;
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HANDLE mChildEvent;
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HANDLE mChildGuard;
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};
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struct MiniShmInitComplete
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{
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enum identifier_t
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{
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identifier = RESERVED_CODE_INIT_COMPLETE
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};
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bool mSucceeded;
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};
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MiniShmBase()
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: mObserver(nullptr),
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mWriteHeader(nullptr),
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mReadHeader(nullptr),
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mPayloadMaxLen(0),
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mGuard(nullptr),
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mTimeout(INFINITE)
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{
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}
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virtual ~MiniShmBase()
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{ }
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virtual void
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OnEvent()
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{
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if (mObserver) {
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mObserver->OnMiniShmEvent(this);
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}
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}
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virtual void
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OnConnect()
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{
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if (mObserver) {
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mObserver->OnMiniShmConnect(this);
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}
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}
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nsresult
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SetView(LPVOID aView, const unsigned int aSize, bool aIsChild)
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{
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if (!aView || aSize <= 2 * sizeof(MiniShmHeader)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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// Divide the region into halves for parent and child
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if (aIsChild) {
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mReadHeader = static_cast<MiniShmHeader*>(aView);
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mWriteHeader = reinterpret_cast<MiniShmHeader*>(static_cast<char*>(aView)
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+ aSize / 2U);
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} else {
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mWriteHeader = static_cast<MiniShmHeader*>(aView);
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mReadHeader = reinterpret_cast<MiniShmHeader*>(static_cast<char*>(aView)
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+ aSize / 2U);
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}
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mPayloadMaxLen = aSize / 2U - sizeof(MiniShmHeader);
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return NS_OK;
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}
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nsresult
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SetGuard(HANDLE aGuard, DWORD aTimeout)
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{
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if (!aGuard || !aTimeout) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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mGuard = aGuard;
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mTimeout = aTimeout;
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return NS_OK;
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}
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inline void
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SetObserver(MiniShmObserver *aObserver) { mObserver = aObserver; }
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/**
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* Obtains a writable pointer into shared memory of type T. This version
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* differs from GetWritePtr in that it allows typename T to be one of
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* the private data structures declared in MiniShmBase.
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*
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* @param aPtr Pointer to receive the shared memory address.
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* This value is set if and only if the function
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* succeeded.
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* @return NS_OK if and only if aPtr was successfully obtained.
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* NS_ERROR_ILLEGAL_VALUE if type T not an internal MiniShm struct.
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* NS_ERROR_NOT_INITIALIZED if there is no valid MiniShm connection.
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*/
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template<typename T> nsresult
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GetWritePtrInternal(T*& aPtr)
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{
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if (!mWriteHeader) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (sizeof(T) > mPayloadMaxLen ||
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T::identifier > RESERVED_CODE_LAST) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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mWriteHeader->mId = T::identifier;
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mWriteHeader->mPayloadLen = sizeof(T);
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aPtr = reinterpret_cast<T*>(mWriteHeader + 1);
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return NS_OK;
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}
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static VOID CALLBACK
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SOnEvent(PVOID aContext, BOOLEAN aIsTimer)
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{
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MiniShmBase* object = static_cast<MiniShmBase*>(aContext);
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object->OnEvent();
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}
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private:
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MiniShmObserver* mObserver;
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MiniShmHeader* mWriteHeader;
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MiniShmHeader* mReadHeader;
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unsigned int mPayloadMaxLen;
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HANDLE mGuard;
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DWORD mTimeout;
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DISALLOW_COPY_AND_ASSIGN(MiniShmBase);
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};
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} // namespace plugins
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} // namespace mozilla
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#endif // mozilla_plugins_MiniShmBase_h
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