Implement Pepper proxy for PPB_DirectoryReader

content/renderer/pepper/pepper_directory_reader_host.h

+// 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.
+
+#ifndef CONTENT_RENDERER_PEPPER_PEPPER_DIRECTORY_READER_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_DIRECTORY_READER_HOST_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/files/file_util_proxy.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+#include "ppapi/c/pp_file_info.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/resource_host.h"
+
+namespace ppapi {
+struct PPB_FileRef_CreateInfo;
+}
+
+namespace webkit {
+namespace ppapi {
+class PPB_FileRef_Impl;
+}
+}
+
+namespace content {
+
+class RendererPpapiHost;
+
+class CONTENT_EXPORT PepperDirectoryReaderHost
+    : public ppapi::host::ResourceHost {
+ public:
+  typedef std::vector<base::FileUtilProxy::Entry> Entries;
+  typedef std::vector<scoped_refptr<webkit::ppapi::PPB_FileRef_Impl> > FileRefs;
+
+  PepperDirectoryReaderHost(RendererPpapiHost* host,
+                            PP_Instance instance,
+                            PP_Resource resource);
+  virtual ~PepperDirectoryReaderHost();
+
+  virtual int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) OVERRIDE;
+
+ private:
+  int32_t OnGetEntries(ppapi::host::HostMessageContext* host_context,
+                       const ppapi::HostResource& resource);
+  void OnReadDirectory(const Entries& entries, bool has_more, int32_t result);
+  bool AddNewEntries(const Entries& entries);
+
+  // Releases resources which have not been sent to the plugin side.
+  void ReleaseResources();
+
+  void SendGetEntriesReply(int32_t result);
+
+  RendererPpapiHost* renderer_ppapi_host_;
+  ppapi::host::ReplyMessageContext reply_context_;
+
+  scoped_refptr<webkit::ppapi::PPB_FileRef_Impl> directory_ref_;
+
+  // Ensures that the resources are alive for as long as the host is.
+  FileRefs file_refs_;
+
+  std::vector<ppapi::PPB_FileRef_CreateInfo> host_resources_;
+  std::vector<PP_FileType> file_types_;
+
+  base::WeakPtrFactory<PepperDirectoryReaderHost> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperDirectoryReaderHost);
+};
+
+}
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_DIRECTORY_READER_HOST_H_