1 files changed, 81 insertions, 0 deletions
diff --git a/storage/browser/blob/local_file_stream_reader.h b/storage/browser/blob/local_file_stream_reader.h
new file mode 100644
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+++ b/storage/browser/blob/local_file_stream_reader.h
@@ -0,0 +1,81 @@
+// 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 STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_
+#define STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
+#include "storage/browser/blob/file_stream_reader.h"
+#include "storage/browser/storage_browser_export.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace content {
+class LocalFileStreamReaderTest;
+}
+
+namespace net {
+class FileStream;
+}
+
+namespace storage {
+
+// A thin wrapper of net::FileStream with range support for sliced file
+// handling.
+class STORAGE_EXPORT LocalFileStreamReader
+    : public NON_EXPORTED_BASE(FileStreamReader) {
+ public:
+  virtual ~LocalFileStreamReader();
+
+  // FileStreamReader overrides.
+  virtual int Read(net::IOBuffer* buf, int buf_len,
+                   const net::CompletionCallback& callback) OVERRIDE;
+  virtual int64 GetLength(
+      const net::Int64CompletionCallback& callback) OVERRIDE;
+
+ private:
+  friend class FileStreamReader;
+  friend class content::LocalFileStreamReaderTest;
+
+  LocalFileStreamReader(base::TaskRunner* task_runner,
+                        const base::FilePath& file_path,
+                        int64 initial_offset,
+                        const base::Time& expected_modification_time);
+  int Open(const net::CompletionCallback& callback);
+
+  // Callbacks that are chained from Open for Read.
+  void DidVerifyForOpen(const net::CompletionCallback& callback,
+                        int64 get_length_result);
+  void DidOpenFileStream(const net::CompletionCallback& callback,
+                         int result);
+  void DidSeekFileStream(const net::CompletionCallback& callback,
+                         int64 seek_result);
+  void DidOpenForRead(net::IOBuffer* buf,
+                      int buf_len,
+                      const net::CompletionCallback& callback,
+                      int open_result);
+
+  void DidGetFileInfoForGetLength(const net::Int64CompletionCallback& callback,
+                                  base::File::Error error,
+                                  const base::File::Info& file_info);
+
+  scoped_refptr<base::TaskRunner> task_runner_;
+  scoped_ptr<net::FileStream> stream_impl_;
+  const base::FilePath file_path_;
+  const int64 initial_offset_;
+  const base::Time expected_modification_time_;
+  bool has_pending_open_;
+  base::WeakPtrFactory<LocalFileStreamReader> weak_factory_;
+};
+
+}  // namespace storage
+
+#endif  // STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_