Implement Pepper proxy for PPB_DirectoryReader

ppapi/proxy/directory_reader_resource.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 PPAPI_PROXY_DIRECTORY_READER_RESOURCE_H_
+#define PPAPI_PROXY_DIRECTORY_READER_RESOURCE_H_
+
+#include <queue>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/ppb_file_ref_shared.h"
+#include "ppapi/shared_impl/resource.h"
+#include "ppapi/shared_impl/scoped_pp_resource.h"
+#include "ppapi/thunk/ppb_directory_reader_api.h"
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace proxy {
+
+class PPAPI_PROXY_EXPORT DirectoryReaderResource
+    : public PluginResource,
+      public NON_EXPORTED_BASE(thunk::PPB_DirectoryReader_API) {
+ public:
+  DirectoryReaderResource(Connection connection,
+                          PP_Instance instance,
+                          PP_Resource directory_ref);
+  virtual ~DirectoryReaderResource();
+
+  // Resource overrides.
+  virtual thunk::PPB_DirectoryReader_API* AsPPB_DirectoryReader_API() OVERRIDE;
+
+  // PPB_DirectoryReader_API.
+  virtual int32_t GetNextEntry(
+      PP_DirectoryEntry_Dev* entry,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+
+ private:
+  struct DirectoryEntry {
+    ScopedPPResource file_resource;
+    PP_FileType file_type;
+  };
+
+  void OnPluginMsgGetEntriesReply(
+      const ResourceMessageReplyParams& params,
+      const std::vector<ppapi::PPB_FileRef_CreateInfo>& infos,
+      const std::vector<PP_FileType>& file_types);
+
+  // Fills up an output with the next entry in the directory. If the plugin
+  // resource did not receive directory entries from the host side, returns
+  // false.
+  bool FillUpEntry();
+
+  scoped_refptr<Resource> directory_resource_;
+  std::queue<DirectoryEntry> entries_;
+
+  PP_DirectoryEntry_Dev* output_;
+  bool did_receive_get_entries_reply_;
+
+  scoped_refptr<TrackedCallback> callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(DirectoryReaderResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_DIRECTORY_READER_RESOURCE_H_