Revert of Significantly cleans up the ImageWriter Operation class and subclasses.

chrome/browser/extensions/api/image_writer_private/image_writer_utils.h

+// 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 CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_
+
+#include "base/files/file_path.h"
+#include "base/platform_file.h"
+
+namespace extensions {
+namespace image_writer_utils {
+
+// Utility class for writing data to a removable disk.
+class ImageWriter {
+ public:
+  ImageWriter();
+  virtual ~ImageWriter();
+
+  // Note: If there is already a device open, it will be closed.
+  virtual bool Open(const base::FilePath& path);
+  virtual bool Close();
+
+  // Writes from data_block to the device, and returns the amount written or -1
+  // on error.
+  virtual int Write(const char* data_block, int data_size);
+
+ private:
+   base::PlatformFile file_;
+   int writes_count_;
+};
+
+// Utility class for reading a large file, such as a Chrome OS image.
+class ImageReader {
+ public:
+  ImageReader();
+  virtual ~ImageReader();
+
+  // Note: If there is already a file open, it will be closed.
+  virtual bool Open(const base::FilePath& path);
+  virtual bool Close();
+  // Read from the file into data_block.
+  virtual int Read(char* data_block, int data_size);
+  virtual int64 GetSize();
+
+ private:
+  base::PlatformFile file_;
+};
+
+} // namespace image_writer_utils
+} // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_