1 files changed, 75 insertions, 0 deletions
diff --git a/chrome/renderer/pepper/pepper_shared_memory_message_filter.cc b/chrome/renderer/pepper/pepper_shared_memory_message_filter.cc
new file mode 100644
index 0000000..c568218
--- /dev/null
+++ b/chrome/renderer/pepper/pepper_shared_memory_message_filter.cc
@@ -0,0 +1,75 @@
+// Copyright (c) 2013 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 "chrome/renderer/pepper/pepper_shared_memory_message_filter.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/process_util.h"
+#include "base/shared_memory.h"
+#include "content/public/common/content_client.h"
+#include "content/public/renderer/render_thread.h"
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "webkit/plugins/ppapi/host_globals.h"
+
+namespace chrome {
+
+PepperSharedMemoryMessageFilter::PepperSharedMemoryMessageFilter(
+    content::RendererPpapiHost* host)
+    : InstanceMessageFilter(host->GetPpapiHost()),
+      host_(host) {
+}
+
+PepperSharedMemoryMessageFilter::~PepperSharedMemoryMessageFilter() {
+}
+
+bool PepperSharedMemoryMessageFilter::OnInstanceMessageReceived(
+    const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PepperSharedMemoryMessageFilter, msg)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_SharedMemory_CreateSharedMemory,
+                        OnHostMsgCreateSharedMemory)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+bool PepperSharedMemoryMessageFilter::Send(IPC::Message* msg) {
+  return host_->GetPpapiHost()->Send(msg);
+}
+
+void PepperSharedMemoryMessageFilter::OnHostMsgCreateSharedMemory(
+    PP_Instance instance,
+    uint32_t size,
+    int* host_handle_id,
+    ppapi::proxy::SerializedHandle* plugin_handle) {
+  plugin_handle->set_null_shmem();
+  *host_handle_id = -1;
+  scoped_ptr<base::SharedMemory> shm(content::RenderThread::Get()->
+      HostAllocateSharedMemoryBuffer(size).Pass());
+  if (!shm.get())
+    return;
+
+  base::SharedMemoryHandle host_shm_handle;
+  shm->ShareToProcess(base::GetCurrentProcessHandle(), &host_shm_handle);
+  *host_handle_id = content::GetHostGlobals()->GetVarTracker()->
+      TrackSharedMemoryHandle(instance, host_shm_handle, size);
+
+  base::PlatformFile host_handle =
+#if defined(OS_WIN)
+      host_shm_handle;
+#elif defined(OS_POSIX)
+      host_shm_handle.fd;
+#else
+  #error Not implemented.
+#endif
+  // We set auto_close to false since we need our file descriptor to
+  // actually be duplicated on linux. The shared memory destructor will
+  // close the original handle for us.
+  plugin_handle->set_shmem(
+      host_->ShareHandleWithRemote(host_handle, false), size);
+}
+
+}  // namespace chrome