1 files changed, 58 insertions, 0 deletions
diff --git a/ppapi/proxy/enter_proxy.h b/ppapi/proxy/enter_proxy.h
new file mode 100644
index 0000000..6e52705
--- /dev/null
+++ b/ppapi/proxy/enter_proxy.h
@@ -0,0 +1,58 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_PROXY_ENTER_PROXY_H_
+#define PPAPI_PROXY_ENTER_PROXY_H_
+
+#include "base/logging.h"
+#include "ppapi/proxy/host_dispatcher.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
+#include "ppapi/thunk/enter.h"
+
+namespace pp {
+namespace proxy {
+
+// Wrapper around EnterResourceNoLock that takes a host resource. This is used
+// when handling messages in the plugin from the host and we need to convert to
+// an object in the plugin side corresponding to that.
+//
+// This never locks since we assume the host Resource is coming from IPC, and
+// never logs errors since we assume the host is doing reasonable things.
+template<typename ResourceT>
+class EnterPluginFromHostResource
+    : public ::ppapi::thunk::EnterResourceNoLock<ResourceT> {
+ public:
+  EnterPluginFromHostResource(const HostResource& host_resource)
+      : ::ppapi::thunk::EnterResourceNoLock<ResourceT>(
+            PluginResourceTracker::GetInstance()->PluginResourceForHostResource(
+                host_resource),
+            false) {
+    // Validate that we're in the plugin rather than the host. Otherwise this
+    // object will do the wrong thing. In the plugin, the instance should have
+    // a corresponding plugin dispatcher (assuming the resource is valid).
+    DCHECK(this->failed() ||
+           PluginDispatcher::GetForInstance(host_resource.instance()));
+  }
+};
+
+template<typename ResourceT>
+class EnterHostFromHostResource
+    : public ::ppapi::thunk::EnterResourceNoLock<ResourceT> {
+ public:
+  EnterHostFromHostResource(const HostResource& host_resource)
+      : ::ppapi::thunk::EnterResourceNoLock<ResourceT>(
+            host_resource.host_resource(), false) {
+    // Validate that we're in the host rather than the plugin. Otherwise this
+    // object will do the wrong thing. In the host, the instance should have
+    // a corresponding host disptacher (assuming the resource is valid).
+    DCHECK(this->failed() ||
+           HostDispatcher::GetForInstance(host_resource.instance()));
+  }
+};
+
+}  // namespace proxy
+}  // namespace pp
+
+#endif  // PPAPI_PROXY_ENTER_PROXY_H_