Proxy PPB_Input_Event, PPP_Input_Event, and associated IFs.

src/shared/ppapi_proxy/plugin_ppp_input_event_rpc_server.cc

+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// SRPC-abstraction wrappers around PPB_InputEvent functions.
+
+#include <cstring>
+
+#include "native_client/src/include/portability.h"
+#include "native_client/src/include/portability_process.h"
+#include "native_client/src/include/nacl_scoped_ptr.h"
+#include "native_client/src/shared/ppapi_proxy/input_event_data.h"
+#include "native_client/src/shared/ppapi_proxy/object_serialize.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_ppb_var.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_ppb_input_event.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_resource.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_resource_tracker.h"
+#include "native_client/src/shared/ppapi_proxy/untrusted/srpcgen/ppp_rpc.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "native_client/src/third_party/ppapi/c/pp_resource.h"
+#include "native_client/src/third_party/ppapi/c/pp_var.h"
+#include "native_client/src/third_party/ppapi/c/ppp.h"
+#include "native_client/src/third_party/ppapi/c/ppp_input_event.h"
+
+using nacl::scoped_ptr;
+using ppapi_proxy::DebugPrintf;
+using ppapi_proxy::DeserializeTo;
+using ppapi_proxy::InputEventData;
+using ppapi_proxy::PPPInputEventInterface;
+using ppapi_proxy::PluginInputEvent;
+using ppapi_proxy::PluginResource;
+using ppapi_proxy::PluginResourceTracker;
+
+
+void PppInputEventRpcServer::PPP_InputEvent_HandleInputEvent(
+    NaClSrpcRpc* rpc,
+    NaClSrpcClosure* done,
+    // inputs
+    PP_Instance instance,
+    PP_Resource browser_resource,
+    uint32_t event_data_size, char* event_data,
+    uint32_t character_text_size, char* character_text_bytes,
+    // outputs
+    int32_t* handled) {
+  rpc->result = NACL_SRPC_RESULT_APP_ERROR;
+  NaClSrpcClosureRunner runner(done);
+  *handled = static_cast<int32_t>(PP_FALSE);
+
+  const PPP_InputEvent* input_event_interface = PPPInputEventInterface();
+  if (!input_event_interface || !(input_event_interface->HandleInputEvent)) {
+    DebugPrintf("PppInstanceRpcServer::PPP_InputEvent_HandleInputEvent: "
+                "No PPP_InputEvent interface registered, or it has an invalid "
+                "HandleInputEvent function.\n");
+    DCHECK(false);
+    rpc->result = NACL_SRPC_RESULT_APP_ERROR;
+    return;
+  }
+  // The browser will immediately release this resource when we return, hence
+  // we use a browser count of 0. If the NaCl instance calls AddRefResource,
+  // the ResourceTracker will inform the browser synchronously, so the resource
+  // will be retained.
+  scoped_refptr<PluginInputEvent> input_event =
+      PluginResource::AdoptAsWithNoBrowserCount<PluginInputEvent>(
+          browser_resource);
+  // Now deserialize the input event data and initialize the local
+  // InputEventData with it. Note that we don't actually use the provided
+  // PP_Resource for anything; we have all the data sent to us immediately to
+  // avoid too much RPC in input event handling calls. Using the browser-
+  // provided resource id, however, guarantees our PP_Resource is unique (since
+  // all other resource ids used in the untrusted side were also provided by
+  // the browser).
+  InputEventData data;
+  std::memcpy(&data, event_data, event_data_size);
+  PP_Var character_text_var = PP_MakeUndefined();
+  DeserializeTo(rpc->channel, character_text_bytes, character_text_size, 1,
+                &character_text_var);
+  input_event->Init(data, character_text_var);
+
+  *handled = static_cast<int32_t>(
+      input_event_interface->HandleInputEvent(instance, browser_resource));
+  DebugPrintf("PPP_InputEvent::HandleInputEvent: handled=%d\n", handled);
+  // Now release the input, to match the behavior of the browser. If the NaCl
+  // instance wants to retain the input event for any reason (e.g. to share it
+  // to another thread), it must have called AddRefResource by now. If it has
+  // not, then the input event resource will be deleted from
+  // PluginResourceTracker's cache, and because the browser refcount was set to
+  // 0, the resource tracker will *not* tell the browser. When we return, the
+  // browser decrements its local reference count for us.
+  PluginResourceTracker::Get()->UnrefResource(browser_resource);
+
+  rpc->result = NACL_SRPC_RESULT_OK;
+}
+