From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 dom/plugins/ipc/MiniShmParent.cpp | 218 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 218 insertions(+)
 create mode 100644 dom/plugins/ipc/MiniShmParent.cpp

(limited to 'dom/plugins/ipc/MiniShmParent.cpp')

diff --git a/dom/plugins/ipc/MiniShmParent.cpp b/dom/plugins/ipc/MiniShmParent.cpp
new file mode 100644
index 000000000..eb0b16c8a
--- /dev/null
+++ b/dom/plugins/ipc/MiniShmParent.cpp
@@ -0,0 +1,218 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MiniShmParent.h"
+
+#include "base/scoped_handle.h"
+
+#include <sstream>
+
+namespace mozilla {
+namespace plugins {
+
+// static
+const unsigned int MiniShmParent::kDefaultMiniShmSectionSize = 0x1000;
+
+MiniShmParent::MiniShmParent()
+  : mSectionSize(0),
+    mParentEvent(nullptr),
+    mParentGuard(nullptr),
+    mChildEvent(nullptr),
+    mChildGuard(nullptr),
+    mRegWait(nullptr),
+    mFileMapping(nullptr),
+    mView(nullptr),
+    mIsConnected(false),
+    mTimeout(INFINITE)
+{
+}
+
+MiniShmParent::~MiniShmParent()
+{
+  CleanUp();
+}
+
+void
+MiniShmParent::CleanUp()
+{
+  if (mRegWait) {
+    ::UnregisterWaitEx(mRegWait, INVALID_HANDLE_VALUE);
+    mRegWait = nullptr;
+  }
+  if (mParentEvent) {
+    ::CloseHandle(mParentEvent);
+    mParentEvent = nullptr;
+  }
+  if (mParentGuard) {
+    ::CloseHandle(mParentGuard);
+    mParentGuard = nullptr;
+  }
+  if (mChildEvent) {
+    ::CloseHandle(mChildEvent);
+    mChildEvent = nullptr;
+  }
+  if (mChildGuard) {
+    ::CloseHandle(mChildGuard);
+    mChildGuard = nullptr;
+  }
+  if (mView) {
+    ::UnmapViewOfFile(mView);
+    mView = nullptr;
+  }
+  if (mFileMapping) {
+    ::CloseHandle(mFileMapping);
+    mFileMapping = nullptr;
+  }
+}
+
+nsresult
+MiniShmParent::Init(MiniShmObserver* aObserver, const DWORD aTimeout,
+                    const unsigned int aSectionSize)
+{
+  if (!aObserver || !aSectionSize || (aSectionSize % 0x1000) || !aTimeout) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+  if (mFileMapping) {
+    return NS_ERROR_ALREADY_INITIALIZED;
+  }
+  SECURITY_ATTRIBUTES securityAttributes = {sizeof(securityAttributes),
+                                            nullptr,
+                                            TRUE};
+  ScopedHandle parentEvent(::CreateEvent(&securityAttributes,
+                                         FALSE,
+                                         FALSE,
+                                         nullptr));
+  if (!parentEvent.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  ScopedHandle parentGuard(::CreateEvent(&securityAttributes,
+                                         FALSE,
+                                         TRUE,
+                                         nullptr));
+  if (!parentGuard.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  ScopedHandle childEvent(::CreateEvent(&securityAttributes,
+                                        FALSE,
+                                        FALSE,
+                                        nullptr));
+  if (!childEvent.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  ScopedHandle childGuard(::CreateEvent(&securityAttributes,
+                                        FALSE,
+                                        TRUE,
+                                        nullptr));
+  if (!childGuard.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  ScopedHandle mapping(::CreateFileMapping(INVALID_HANDLE_VALUE,
+                                           &securityAttributes,
+                                           PAGE_READWRITE,
+                                           0,
+                                           aSectionSize,
+                                           nullptr));
+  if (!mapping.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  ScopedMappedFileView view(::MapViewOfFile(mapping,
+                                            FILE_MAP_WRITE,
+                                            0, 0, 0));
+  if (!view.IsValid()) {
+    return NS_ERROR_FAILURE;
+  }
+  nsresult rv = SetView(view, aSectionSize, false);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = SetGuard(childGuard, aTimeout);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  MiniShmInit* initStruct = nullptr;
+  rv = GetWritePtrInternal(initStruct);
+  NS_ENSURE_SUCCESS(rv, rv);
+  initStruct->mParentEvent = parentEvent;
+  initStruct->mParentGuard = parentGuard;
+  initStruct->mChildEvent = childEvent;
+  initStruct->mChildGuard = childGuard;
+
+  if (!::RegisterWaitForSingleObject(&mRegWait,
+                                     parentEvent,
+                                     &SOnEvent,
+                                     this,
+                                     INFINITE,
+                                     WT_EXECUTEDEFAULT)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mParentEvent = parentEvent.Take();
+  mParentGuard = parentGuard.Take();
+  mChildEvent = childEvent.Take();
+  mChildGuard = childGuard.Take();
+  mFileMapping = mapping.Take();
+  mView = view.Take();
+  mSectionSize = aSectionSize;
+  SetObserver(aObserver);
+  mTimeout = aTimeout;
+  return NS_OK;
+}
+
+nsresult
+MiniShmParent::GetCookie(std::wstring& cookie)
+{
+  if (!mFileMapping) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  std::wostringstream oss;
+  oss << mFileMapping;
+  if (!oss) {
+    return NS_ERROR_FAILURE;
+  }
+  cookie = oss.str();
+  return NS_OK;
+}
+
+nsresult
+MiniShmParent::Send()
+{
+  if (!mChildEvent) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  if (!::SetEvent(mChildEvent)) {
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+bool
+MiniShmParent::IsConnected() const
+{
+  return mIsConnected;
+}
+
+void
+MiniShmParent::OnEvent()
+{
+  if (mIsConnected) {
+    MiniShmBase::OnEvent();
+  } else {
+    FinalizeConnection();
+  }
+  ::SetEvent(mParentGuard);
+}
+
+void
+MiniShmParent::FinalizeConnection()
+{
+  const MiniShmInitComplete* initCompleteStruct = nullptr;
+  nsresult rv = GetReadPtr(initCompleteStruct);
+  mIsConnected = NS_SUCCEEDED(rv) && initCompleteStruct->mSucceeded;
+  if (mIsConnected) {
+    OnConnect();
+  }
+}
+
+} // namespace plugins
+} // namespace mozilla
+
-- 
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