Move DirectoryReader::ReadEntries to FileRef::ReadDirectoryEntries

webkit/plugins/ppapi/file_callbacks.h

 // 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.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_FILE_CALLBACKS_H_
 #define WEBKIT_PLUGINS_PPAPI_FILE_CALLBACKS_H_
 
 #include <string>
 #include <vector>
 
+#include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/platform_file.h"
 #include "googleurl/src/gurl.h"
+#include "ppapi/c/pp_array_output.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/pp_resource.h"
 #include "webkit/fileapi/file_system_callback_dispatcher.h"
 
 struct PP_FileInfo;
 
 namespace base {
 class FilePath;
 }
 
 namespace ppapi {
 class Resource;
 class TrackedCallback;
+struct PPB_FileRef_CreateInfo;
 }
 
 namespace webkit {
 namespace ppapi {
 
+class PPB_FileRef_Impl;
+
+// A wrapper class which encapsulates the difference between
+// linked_ptr and a raw pointer. For in-process mode, the caller must
+// maintain the lifetime of heap objects so we use a raw pointer.
+// Renderers in out-of-process mode will use a linked_ptr because
+// it's renderers' responsibility to manage the lifetime of the heap
+// objects properly.
+template <class T> class maybe_linked_ptr {
+ public:
+  maybe_linked_ptr()
+      : raw_(NULL) {
+  }
+  explicit maybe_linked_ptr(T* p)
+      : raw_(p) {
+  }
+  explicit maybe_linked_ptr(linked_ptr<T> p)
+      : raw_(NULL), linked_(p) {
+  }
+
+  T* get() const {
+    return raw_ ? raw_ : linked_.get();
+  }
+  T* operator->() const {
+    return get();
+  }
+
+ private:
+  T* raw_;
+  linked_ptr<T> linked_;
+};
+
 // Instances of this class are deleted by FileSystemDispatcher.
 class FileCallbacks : public fileapi::FileSystemCallbackDispatcher {
+  typedef std::vector< ::ppapi::PPB_FileRef_CreateInfo> CreateInfos;
+  typedef std::vector<PP_FileType> FileTypes;
+
  public:
+  // Doesn't take the ownership of members.
+  struct ReadDirectoryEntriesParams {
+    PPB_FileRef_Impl* dir_ref;
+    linked_ptr<CreateInfos> files;
+    linked_ptr<FileTypes> file_types;
+  };
+
+  FileCallbacks(::ppapi::Resource* resource,
+                scoped_refptr< ::ppapi::TrackedCallback> callback);
   FileCallbacks(::ppapi::Resource* resource,
                 scoped_refptr< ::ppapi::TrackedCallback> callback,
-                PP_FileInfo* info);
+                maybe_linked_ptr<PP_FileInfo> info,
+                PP_FileSystemType file_system_type);
   FileCallbacks(::ppapi::Resource* resource,
                 scoped_refptr< ::ppapi::TrackedCallback> callback,
-                PP_FileInfo* info,
-                PP_FileSystemType file_system_type);
+                const ReadDirectoryEntriesParams& params);
   virtual ~FileCallbacks();
 
   // FileSystemCallbackDispatcher implementation.
   virtual void DidSucceed();
   virtual void DidReadMetadata(
       const base::PlatformFileInfo& file_info,
       const base::FilePath& unused);
   virtual void DidCreateSnapshotFile(
       const base::PlatformFileInfo& file_info,
       const base::FilePath& path);
   virtual void DidReadDirectory(
       const std::vector<base::FileUtilProxy::Entry>& entries, bool has_more);
   virtual void DidOpenFileSystem(const std::string&,
                                  const GURL& root_url);
   virtual void DidFail(base::PlatformFileError error_code);
   virtual void DidWrite(int64 bytes, bool complete);
 
   scoped_refptr< ::ppapi::TrackedCallback> GetTrackedCallback() const;
 
  private:
   void RunCallback(base::PlatformFileError error_code);
 
   scoped_refptr< ::ppapi::TrackedCallback> callback_;
-  PP_FileInfo* info_;
+  maybe_linked_ptr<PP_FileInfo> info_;
   PP_FileSystemType file_system_type_;
+  PPB_FileRef_Impl* read_entries_dir_ref_;
+  linked_ptr<CreateInfos> read_entries_files_;
+  linked_ptr<FileTypes> read_entries_file_types_;
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_FILE_CALLBACKS_H_