base: Move MemoryMappedFile out of file_util.h and into its own header file.

base/file_util.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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 542 matching lines @@
   base::FilePath::StringType pattern_;  // Empty when we want to find
                                         // everything.
 
   // A stack that keeps track of which subdirectories we still need to
   // enumerate in the breadth-first search.
   std::stack<base::FilePath> pending_paths_;
 
   DISALLOW_COPY_AND_ASSIGN(FileEnumerator);
 };
 
-class BASE_EXPORT MemoryMappedFile {
- public:
-  // The default constructor sets all members to invalid/null values.
-  MemoryMappedFile();
-  ~MemoryMappedFile();
-
-  // 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 base::FilePath& file_name);
-  // As above, but works with an already-opened file. MemoryMappedFile will take
-  // ownership of |file| and close it when done.
-  bool Initialize(base::PlatformFile file);
-
-#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 base::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:
-  // Open the given file and pass it to MapFileToMemoryInternal().
-  bool MapFileToMemory(const base::FilePath& file_name);
-
-  // 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 MapFileToMemoryInternal();
-
-  // Closes all open handles. Later we may want to make this public.
-  void CloseHandles();
-
-#if defined(OS_WIN)
-  // MapFileToMemoryInternal calls this function. It provides the ability to
-  // pass in flags which control the mapped section.
-  bool MapFileToMemoryInternalEx(int flags);
-
-  HANDLE file_mapping_;
-#endif
-  base::PlatformFile file_;
-  uint8* data_;
-  size_t length_;
-
-  DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile);
-};
-
 // Returns whether the file has been modified since a particular date.
 BASE_EXPORT bool HasFileBeenModifiedSince(
     const FileEnumerator::FindInfo& find_info,
     const base::Time& cutoff_time);
 
 #if defined(OS_LINUX)
 // Broad categories of file systems as returned by statfs() on Linux.
 enum FileSystemType {
   FILE_SYSTEM_UNKNOWN,  // statfs failed.
   FILE_SYSTEM_0,        // statfs.f_type == 0 means unknown, may indicate AFS.
   FILE_SYSTEM_ORDINARY,       // on-disk filesystem like ext2
   FILE_SYSTEM_NFS,
   FILE_SYSTEM_SMB,
   FILE_SYSTEM_CODA,
   FILE_SYSTEM_MEMORY,         // in-memory file system
   FILE_SYSTEM_CGROUP,         // cgroup control.
   FILE_SYSTEM_OTHER,          // any other value.
   FILE_SYSTEM_TYPE_COUNT
 };
 
 // Attempts determine the FileSystemType for |path|.
 // Returns false if |path| doesn't exist.
 BASE_EXPORT bool GetFileSystemType(const base::FilePath& path,
                                    FileSystemType* type);
 #endif
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_