[PPAPI] Implement an IOStreamResource for data transmission between plugin and renderer.

ppapi/proxy/io_stream_resource.cc

+// Copyright (c) 2012 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.
+
+#include "ppapi/proxy/io_stream_resource.h"
+
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace ppapi {
+namespace proxy {
+
+IOStreamResource::IOStreamResource(Connection connection,
+                                   PP_Instance instance,
+                                   bool input)
+    : PluginResource(connection, instance),
+      IOStreamShared(input) {
+}
+
+IOStreamResource::IOStreamResource(Connection connection,
+                                   PP_Instance instance,
+                                   int pending_renderer_id,
+                                   bool input)
+    : PluginResource(connection, instance),
+      IOStreamShared(input) {
+  AttachToPendingHost(RENDERER, pending_renderer_id);
+}
+
+IOStreamResource::~IOStreamResource() {
+}
+
+int32_t IOStreamResource::Init(uint32_t size) {
+  CHECK(size);

[bbudge, 2013/12/31 00:51:53]

You should probably return PP_ERROR_BADARGUMENT instead of asserting.

[Peng, 2013/12/31 23:33:54]

Done.

+  IPC::Message unused;
+  ResourceMessageReplyParams reply_params;
+  int32_t result = GenericSyncCall(RENDERER,
+      PpapiHostMsg_IOStream_Init(size), &unused, &reply_params);
+  if (result != PP_OK)
+    return result;
+
+  base::SharedMemoryHandle shm_handle = base::SharedMemory::NULLHandle();
+  reply_params.TakeSharedMemoryHandleAtIndex(0, &shm_handle);
+
+  SetBuffer(scoped_ptr<base::SharedMemory>(
+        new base::SharedMemory(shm_handle, true)), size);
+  return PP_OK;
+}
+
+void IOStreamResource::MovePeerLimit(uint32_t offset) {
+  Post(RENDERER, PpapiHostMsg_IOStream_MoveLimit(offset));
+}
+
+void IOStreamResource::OnReplyReceived(
+    const proxy::ResourceMessageReplyParams& params, const IPC::Message& msg) {
+  IPC_BEGIN_MESSAGE_MAP(IOStreamResource, msg)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_IOStream_Init,
+        OnPluginMsgInit)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_IOStream_MoveLimit,
+        OnPluginMsgMoveLimit)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(
+        PluginResource::OnReplyReceived(params, msg))
+  IPC_END_MESSAGE_MAP()
+}
+
+void IOStreamResource::OnPluginMsgInit(
+    const ResourceMessageReplyParams& params, uint32_t size) {
+  base::SharedMemoryHandle shm_handle = base::SharedMemory::NULLHandle();
+  params.TakeSharedMemoryHandleAtIndex(0, &shm_handle);
+  SetBuffer(scoped_ptr<base::SharedMemory>(
+        new base::SharedMemory(shm_handle, input())), size);
+}
+
+void IOStreamResource::OnPluginMsgMoveLimit(
+    const ResourceMessageReplyParams& params, uint32_t offset) {
+  MoveLimit(offset);
+}
+
+}  // namespace proxy
+}  // namespace ppapi