Move base to DEPS

base/files/memory_mapped_file.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 BASE_FILES_MEMORY_MAPPED_FILE_H_
-#define BASE_FILES_MEMORY_MAPPED_FILE_H_
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/files/file.h"
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
-namespace base {
-
-class FilePath;
-
-class BASE_EXPORT MemoryMappedFile {
- public:
-  // The default constructor sets all members to invalid/null values.
-  MemoryMappedFile();
-  ~MemoryMappedFile();
-
-  // Used to hold information about a region [offset + size] of a file.
-  struct BASE_EXPORT Region {
-    static const Region kWholeFile;
-
-    bool operator==(const Region& other) const;
-    bool operator!=(const Region& other) const;
-
-    // Start of the region (measured in bytes from the beginning of the file).
-    int64 offset;
-
-    // Length of the region in bytes.
-    int64 size;
-  };
-
-  // Opens an existing file and maps it into memory. Access is restricted to
-  // read only. If this object already points to a valid memory mapped file
-  // then this method will fail and return false. If it cannot open the file,
-  // the file does not exist, or the memory mapping fails, it will return false.
-  // Later we may want to allow the user to specify access.
-  bool Initialize(const FilePath& file_name);
-
-  // As above, but works with an already-opened file. MemoryMappedFile takes
-  // ownership of |file| and closes it when done.
-  bool Initialize(File file);
-
-  // As above, but works with a region of an already-opened file.
-  bool Initialize(File file, const Region& region);
-
-#if defined(OS_WIN)
-  // Opens an existing file and maps it as an image section. Please refer to
-  // the Initialize function above for additional information.
-  bool InitializeAsImageSection(const FilePath& file_name);
-#endif  // OS_WIN
-
-  const uint8* data() const { return data_; }
-  size_t length() const { return length_; }
-
-  // Is file_ a valid file handle that points to an open, memory mapped file?
-  bool IsValid() const;
-
- private:
-  // Given the arbitrarily aligned memory region [start, size], returns the
-  // boundaries of the region aligned to the granularity specified by the OS,
-  // (a page on Linux, ~32k on Windows) as follows:
-  // - |aligned_start| is page aligned and <= |start|.
-  // - |aligned_size| is a multiple of the VM granularity and >= |size|.
-  // - |offset| is the displacement of |start| w.r.t |aligned_start|.
-  static void CalculateVMAlignedBoundaries(int64 start,
-                                           int64 size,
-                                           int64* aligned_start,
-                                           int64* aligned_size,
-                                           int32* offset);
-
-  // Map the file to memory, set data_ to that memory address. Return true on
-  // success, false on any kind of failure. This is a helper for Initialize().
-  bool MapFileRegionToMemory(const Region& region);
-
-  // Closes all open handles.
-  void CloseHandles();
-
-  File file_;
-  uint8* data_;
-  size_t length_;
-
-#if defined(OS_WIN)
-  win::ScopedHandle file_mapping_;
-  bool image_;  // Map as an image.
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile);
-};
-
-}  // namespace base
-
-#endif  // BASE_FILES_MEMORY_MAPPED_FILE_H_