1 files changed, 61 insertions, 0 deletions
diff --git a/storage/browser/fileapi/quota/open_file_handle_context.h b/storage/browser/fileapi/quota/open_file_handle_context.h
new file mode 100644
index 0000000..cb37064
--- /dev/null
+++ b/storage/browser/fileapi/quota/open_file_handle_context.h
@@ -0,0 +1,61 @@
+// Copyright 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 STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_
+#define STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "storage/browser/storage_browser_export.h"
+#include "storage/common/fileapi/file_system_types.h"
+#include "url/gurl.h"
+
+namespace storage {
+
+class QuotaReservationBuffer;
+
+// This class represents a underlying file of a managed FileSystem file.
+// The instance keeps alive while at least one consumer keeps an open file
+// handle.
+// This class is usually manipulated only via OpenFileHandle.
+class OpenFileHandleContext : public base::RefCounted<OpenFileHandleContext> {
+ public:
+  OpenFileHandleContext(const base::FilePath& platform_path,
+                        QuotaReservationBuffer* reservation_buffer);
+
+  // Updates the max written offset and returns the amount of growth.
+  int64 UpdateMaxWrittenOffset(int64 offset);
+
+  void AddAppendModeWriteAmount(int64 amount);
+
+  const base::FilePath& platform_path() const {
+    return platform_path_;
+  }
+
+  int64 GetEstimatedFileSize() const;
+  int64 GetMaxWrittenOffset() const;
+
+ private:
+  friend class base::RefCounted<OpenFileHandleContext>;
+  virtual ~OpenFileHandleContext();
+
+  int64 initial_file_size_;
+  int64 maximum_written_offset_;
+  int64 append_mode_write_amount_;
+  base::FilePath platform_path_;
+
+  scoped_refptr<QuotaReservationBuffer> reservation_buffer_;
+
+  base::SequenceChecker sequence_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(OpenFileHandleContext);
+};
+
+}  // namespace storage
+
+#endif  // STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_