Fix line endings in base/file_util.h.

BUG=none
TEST=none
TBR=skerner@chromium.org

Review URL: http://codereview.chromium.org/8302010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105569 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 633 insertions, 633 deletions

diff --git a/base/file_util.h b/base/file_util.h
index 2cc8caa..a0d517d 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -1,633 +1,633 @@
-// Copyright (c) 2011 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_

-#pragma once

-

-#include "build/build_config.h"

-

-#if defined(OS_WIN)

-#include <windows.h>

-#elif defined(OS_POSIX)

-#include <sys/stat.h>

-#include <unistd.h>

-#endif

-

-#include <stdio.h>

-

-#include <stack>

-#include <string>

-#include <vector>

-

-#include "base/base_export.h"

-#include "base/basictypes.h"

-#include "base/file_path.h"

-#include "base/memory/scoped_ptr.h"

-#include "base/platform_file.h"

-#include "base/string16.h"

-

-#if defined(OS_POSIX)

-#include "base/eintr_wrapper.h"

-#include "base/file_descriptor_posix.h"

-#include "base/logging.h"

-#endif

-

-namespace base {

-class Time;

-}

-

-namespace file_util {

-

-//-----------------------------------------------------------------------------

-// Functions that operate purely on a path string w/o touching the filesystem:

-

-// Returns true if the given path ends with a path separator character.

-BASE_EXPORT bool EndsWithSeparator(const FilePath& path);

-

-// Makes sure that |path| ends with a separator IFF path is a directory that

-// exists. Returns true if |path| is an existing directory, false otherwise.

-BASE_EXPORT bool EnsureEndsWithSeparator(FilePath* path);

-

-// Convert provided relative path into an absolute path.  Returns false on

-// error. On POSIX, this function fails if the path does not exist.

-BASE_EXPORT bool AbsolutePath(FilePath* path);

-

-// Returns true if |parent| contains |child|. Both paths are converted to

-// absolute paths before doing the comparison.

-BASE_EXPORT bool ContainsPath(const FilePath& parent, const FilePath& child);

-

-//-----------------------------------------------------------------------------

-// Functions that involve filesystem access or modification:

-

-// Returns the number of files matching the current path that were

-// created on or after the given |file_time|.  Doesn't count ".." or ".".

-//

-// Note for POSIX environments: a file created before |file_time|

-// can be mis-detected as a newer file due to low precision of

-// timestmap of file creation time. If you need to avoid such

-// mis-detection perfectly, you should wait one second before

-// obtaining |file_time|.

-BASE_EXPORT int CountFilesCreatedAfter(const FilePath& path,

-                                       const base::Time& file_time);

-

-// Returns the total number of bytes used by all the files under |root_path|.

-// If the path does not exist the function returns 0.

-//

-// This function is implemented using the FileEnumerator class so it is not

-// particularly speedy in any platform.

-BASE_EXPORT int64 ComputeDirectorySize(const FilePath& root_path);

-

-// Returns the total number of bytes used by all files matching the provided

-// |pattern|, on this |directory| (without recursion). If the path does not

-// exist the function returns 0.

-//

-// This function is implemented using the FileEnumerator class so it is not

-// particularly speedy in any platform.

-BASE_EXPORT int64 ComputeFilesSize(const FilePath& directory,

-                                   const FilePath::StringType& pattern);

-

-// Deletes the given path, whether it's a file or a directory.

-// If it's a directory, it's perfectly happy to delete all of the

-// directory's contents.  Passing true to recursive deletes

-// subdirectories and their contents as well.

-// Returns true if successful, false otherwise.

-//

-// WARNING: USING THIS WITH recursive==true IS EQUIVALENT

-//          TO "rm -rf", SO USE WITH CAUTION.

-BASE_EXPORT bool Delete(const FilePath& path, bool recursive);

-

-#if defined(OS_WIN)

-// Schedules to delete the given path, whether it's a file or a directory, until

-// the operating system is restarted.

-// Note:

-// 1) The file/directory to be deleted should exist in a temp folder.

-// 2) The directory to be deleted must be empty.

-BASE_EXPORT bool DeleteAfterReboot(const FilePath& path);

-#endif

-

-// Moves the given path, whether it's a file or a directory.

-// If a simple rename is not possible, such as in the case where the paths are

-// on different volumes, this will attempt to copy and delete. Returns

-// true for success.

-BASE_EXPORT bool Move(const FilePath& from_path, const FilePath& to_path);

-

-// Renames file |from_path| to |to_path|. Both paths must be on the same

-// volume, or the function will fail. Destination file will be created

-// if it doesn't exist. Prefer this function over Move when dealing with

-// temporary files. On Windows it preserves attributes of the target file.

-// Returns true on success.

-BASE_EXPORT bool ReplaceFile(const FilePath& from_path,

-                             const FilePath& to_path);

-

-// Copies a single file. Use CopyDirectory to copy directories.

-BASE_EXPORT bool CopyFile(const FilePath& from_path, const FilePath& to_path);

-

-// Copies the given path, and optionally all subdirectories and their contents

-// as well.

-// If there are files existing under to_path, always overwrite.

-// Returns true if successful, false otherwise.

-// Don't use wildcards on the names, it may stop working without notice.

-//

-// If you only need to copy a file use CopyFile, it's faster.

-BASE_EXPORT bool CopyDirectory(const FilePath& from_path,

-                               const FilePath& to_path,

-                               bool recursive);

-

-// Returns true if the given path exists on the local filesystem,

-// false otherwise.

-BASE_EXPORT bool PathExists(const FilePath& path);

-

-// Returns true if the given path is writable by the user, false otherwise.

-BASE_EXPORT bool PathIsWritable(const FilePath& path);

-

-// Returns true if the given path exists and is a directory, false otherwise.

-BASE_EXPORT bool DirectoryExists(const FilePath& path);

-

-#if defined(OS_WIN)

-// Gets the creation time of the given file (expressed in the local timezone),

-// and returns it via the creation_time parameter.  Returns true if successful,

-// false otherwise.

-BASE_EXPORT bool GetFileCreationLocalTime(const std::wstring& filename,

-                                          LPSYSTEMTIME creation_time);

-

-// Same as above, but takes a previously-opened file handle instead of a name.

-BASE_EXPORT bool GetFileCreationLocalTimeFromHandle(HANDLE file_handle,

-                                                    LPSYSTEMTIME creation_time);

-#endif  // defined(OS_WIN)

-

-// Returns true if the contents of the two files given are equal, false

-// otherwise.  If either file can't be read, returns false.

-BASE_EXPORT bool ContentsEqual(const FilePath& filename1,

-                               const FilePath& filename2);

-

-// Returns true if the contents of the two text files given are equal, false

-// otherwise.  This routine treats "\r\n" and "\n" as equivalent.

-BASE_EXPORT bool TextContentsEqual(const FilePath& filename1,

-                                   const FilePath& filename2);

-

-// Read the file at |path| into |contents|, returning true on success.

-// |contents| may be NULL, in which case this function is useful for its

-// side effect of priming the disk cache.

-// Useful for unit tests.

-BASE_EXPORT bool ReadFileToString(const FilePath& path, std::string* contents);

-

-#if defined(OS_POSIX)

-// Read exactly |bytes| bytes from file descriptor |fd|, storing the result

-// in |buffer|. This function is protected against EINTR and partial reads.

-// Returns true iff |bytes| bytes have been successfuly read from |fd|.

-BASE_EXPORT bool ReadFromFD(int fd, char* buffer, size_t bytes);

-

-// Creates a symbolic link at |symlink| pointing to |target|.  Returns

-// false on failure.

-BASE_EXPORT bool CreateSymbolicLink(const FilePath& target,

-                                    const FilePath& symlink);

-

-// Reads the given |symlink| and returns where it points to in |target|.

-// Returns false upon failure.

-BASE_EXPORT bool ReadSymbolicLink(const FilePath& symlink, FilePath* target);

-#endif  // defined(OS_POSIX)

-

-#if defined(OS_WIN)

-// Resolve Windows shortcut (.LNK file)

-// This methods tries to resolve a shortcut .LNK file. If the |path| is valid

-// returns true and puts the target into the |path|, otherwise returns

-// false leaving the path as it is.

-BASE_EXPORT bool ResolveShortcut(FilePath* path);

-

-// Create a Windows shortcut (.LNK file)

-// This method creates a shortcut link using the information given. Ensure

-// you have initialized COM before calling into this function. 'source'

-// and 'destination' parameters are required, everything else can be NULL.

-// 'source' is the existing file, 'destination' is the new link file to be

-// created; for best results pass the filename with the .lnk extension.

-// The 'icon' can specify a dll or exe in which case the icon index is the

-// resource id. 'app_id' is the app model id for the shortcut on Win7.

-// Note that if the shortcut exists it will overwrite it.

-BASE_EXPORT bool CreateShortcutLink(const wchar_t *source,

-                                    const wchar_t *destination,

-                                    const wchar_t *working_dir,

-                                    const wchar_t *arguments,

-                                    const wchar_t *description,

-                                    const wchar_t *icon,

-                                    int icon_index,

-                                    const wchar_t* app_id);

-

-// Update a Windows shortcut (.LNK file). This method assumes the shortcut

-// link already exists (otherwise false is returned). Ensure you have

-// initialized COM before calling into this function. Only 'destination'

-// parameter is required, everything else can be NULL (but if everything else

-// is NULL no changes are made to the shortcut). 'destination' is the link

-// file to be updated. 'app_id' is the app model id for the shortcut on Win7.

-// For best results pass the filename with the .lnk extension.

-BASE_EXPORT bool UpdateShortcutLink(const wchar_t *source,

-                                    const wchar_t *destination,

-                                    const wchar_t *working_dir,

-                                    const wchar_t *arguments,

-                                    const wchar_t *description,

-                                    const wchar_t *icon,

-                                    int icon_index,

-                                    const wchar_t* app_id);

-

-// Pins a shortcut to the Windows 7 taskbar. The shortcut file must already

-// exist and be a shortcut that points to an executable.

-BASE_EXPORT bool TaskbarPinShortcutLink(const wchar_t* shortcut);

-

-// Unpins a shortcut from the Windows 7 taskbar. The shortcut must exist and

-// already be pinned to the taskbar.

-BASE_EXPORT bool TaskbarUnpinShortcutLink(const wchar_t* shortcut);

-

-// Copy from_path to to_path recursively and then delete from_path recursively.

-// Returns true if all operations succeed.

-// This function simulates Move(), but unlike Move() it works across volumes.

-// This fuction is not transactional.

-BASE_EXPORT bool CopyAndDeleteDirectory(const FilePath& from_path,

-                                        const FilePath& to_path);

-#endif  // defined(OS_WIN)

-

-// Return true if the given directory is empty

-BASE_EXPORT bool IsDirectoryEmpty(const FilePath& dir_path);

-

-// Get the temporary directory provided by the system.

-// WARNING: DON'T USE THIS. If you want to create a temporary file, use one of

-// the functions below.

-BASE_EXPORT bool GetTempDir(FilePath* path);

-// Get a temporary directory for shared memory files.

-// Only useful on POSIX; redirects to GetTempDir() on Windows.

-BASE_EXPORT bool GetShmemTempDir(FilePath* path);

-

-// Get the home directory.  This is more complicated than just getenv("HOME")

-// as it knows to fall back on getpwent() etc.

-BASE_EXPORT FilePath GetHomeDir();

-

-// Creates a temporary file. The full path is placed in |path|, and the

-// function returns true if was successful in creating the file. The file will

-// be empty and all handles closed after this function returns.

-BASE_EXPORT bool CreateTemporaryFile(FilePath* path);

-

-// Same as CreateTemporaryFile but the file is created in |dir|.

-BASE_EXPORT bool CreateTemporaryFileInDir(const FilePath& dir,

-                                          FilePath* temp_file);

-

-// Create and open a temporary file.  File is opened for read/write.

-// The full path is placed in |path|.

-// Returns a handle to the opened file or NULL if an error occured.

-BASE_EXPORT FILE* CreateAndOpenTemporaryFile(FilePath* path);

-// Like above but for shmem files.  Only useful for POSIX.

-BASE_EXPORT FILE* CreateAndOpenTemporaryShmemFile(FilePath* path);

-// Similar to CreateAndOpenTemporaryFile, but the file is created in |dir|.

-BASE_EXPORT FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir,

-                                                  FilePath* path);

-

-// Create a new directory. If prefix is provided, the new directory name is in

-// the format of prefixyyyy.

-// NOTE: prefix is ignored in the POSIX implementation.

-// If success, return true and output the full path of the directory created.

-BASE_EXPORT bool CreateNewTempDirectory(const FilePath::StringType& prefix,

-                                        FilePath* new_temp_path);

-

-// Create a directory within another directory.

-// Extra characters will be appended to |prefix| to ensure that the

-// new directory does not have the same name as an existing directory.

-BASE_EXPORT bool CreateTemporaryDirInDir(const FilePath& base_dir,

-                                         const FilePath::StringType& prefix,

-                                         FilePath* new_dir);

-

-// Creates a directory, as well as creating any parent directories, if they

-// don't exist. Returns 'true' on successful creation, or if the directory

-// already exists.  The directory is only readable by the current user.

-BASE_EXPORT bool CreateDirectory(const FilePath& full_path);

-

-// Returns the file size. Returns true on success.

-BASE_EXPORT bool GetFileSize(const FilePath& file_path, int64* file_size);

-

-// Returns true if the given path's base name is ".".

-BASE_EXPORT bool IsDot(const FilePath& path);

-

-// Returns true if the given path's base name is "..".

-BASE_EXPORT bool IsDotDot(const FilePath& path);

-

-// Sets |real_path| to |path| with symbolic links and junctions expanded.

-// On windows, make sure the path starts with a lettered drive.

-// |path| must reference a file.  Function will fail if |path| points to

-// a directory or to a nonexistent path.  On windows, this function will

-// fail if |path| is a junction or symlink that points to an empty file,

-// or if |real_path| would be longer than MAX_PATH characters.

-BASE_EXPORT bool NormalizeFilePath(const FilePath& path, FilePath* real_path);

-

-#if defined(OS_WIN)

-// Given an existing file in |path|, it returns in |real_path| the path

-// in the native NT format, of the form "\Device\HarddiskVolumeXX\..".

-// Returns false it it fails. Empty files cannot be resolved with this

-// function.

-BASE_EXPORT bool NormalizeToNativeFilePath(const FilePath& path,

-                                           FilePath* nt_path);

-#endif

-

-// This function will return if the given file is a symlink or not.

-BASE_EXPORT bool IsLink(const FilePath& file_path);

-

-// Returns information about the given file path.

-BASE_EXPORT bool GetFileInfo(const FilePath& file_path,

-                             base::PlatformFileInfo* info);

-

-// Sets the time of the last access and the time of the last modification.

-BASE_EXPORT bool TouchFile(const FilePath& path,

-                           const base::Time& last_accessed,

-                           const base::Time& last_modified);

-

-// Set the time of the last modification. Useful for unit tests.

-BASE_EXPORT bool SetLastModifiedTime(const FilePath& path,

-                                     const base::Time& last_modified);

-

-#if defined(OS_POSIX)

-// Store inode number of |path| in |inode|. Return true on success.

-BASE_EXPORT bool GetInode(const FilePath& path, ino_t* inode);

-#endif

-

-// Wrapper for fopen-like calls. Returns non-NULL FILE* on success.

-BASE_EXPORT FILE* OpenFile(const FilePath& filename, const char* mode);

-

-// Closes file opened by OpenFile. Returns true on success.

-BASE_EXPORT bool CloseFile(FILE* file);

-

-// Truncates an open file to end at the location of the current file pointer.

-// This is a cross-platform analog to Windows' SetEndOfFile() function.

-BASE_EXPORT bool TruncateFile(FILE* file);

-

-// Reads the given number of bytes from the file into the buffer.  Returns

-// the number of read bytes, or -1 on error.

-BASE_EXPORT int ReadFile(const FilePath& filename, char* data, int size);

-

-// Writes the given buffer into the file, overwriting any data that was

-// previously there.  Returns the number of bytes written, or -1 on error.

-BASE_EXPORT int WriteFile(const FilePath& filename, const char* data, int size);

-#if defined(OS_POSIX)

-// Append the data to |fd|. Does not close |fd| when done.

-BASE_EXPORT int WriteFileDescriptor(const int fd, const char* data, int size);

-#endif

-

-// Gets the current working directory for the process.

-BASE_EXPORT bool GetCurrentDirectory(FilePath* path);

-

-// Sets the current working directory for the process.

-BASE_EXPORT bool SetCurrentDirectory(const FilePath& path);

-

-#if defined(OS_POSIX)

-// Test that |path| can only be changed by a specific user and group.

-// Specifically, test that all parts of |path| under (and including) |base|:

-// * Exist.

-// * Are owned by a specific user and group.

-// * Are not writable by all users.

-// * Are not symbolic links.

-// This is useful for checking that a config file is administrator-controlled.

-// |base| must contain |path|.

-BASE_EXPORT bool VerifyPathControlledByUser(const FilePath& base,

-                                            const FilePath& path,

-                                            uid_t owner_uid,

-                                            gid_t group_gid);

-#endif  // defined(OS_POSIX)

-

-#if defined(OS_MACOSX)

-// Is |path| writable only by a user with administrator privileges?

-// This function uses Mac OS conventions.  The super user is assumed to have

-// uid 0, and the administrator group is assumed to be named "admin".

-// Testing that |path|, and every parent directory including the root of

-// the filesystem, are owned by the superuser, controlled by the group

-// "admin", are not writable by all users, and contain no symbolic links.

-// Will return false if |path| does not exist.

-BASE_EXPORT bool VerifyPathControlledByAdmin(const FilePath& path);

-#endif  // defined(OS_MACOSX)

-

-// A class to handle auto-closing of FILE*'s.

-class ScopedFILEClose {

- public:

-  inline void operator()(FILE* x) const {

-    if (x) {

-      fclose(x);

-    }

-  }

-};

-

-typedef scoped_ptr_malloc<FILE, ScopedFILEClose> ScopedFILE;

-

-#if defined(OS_POSIX)

-// A class to handle auto-closing of FDs.

-class ScopedFDClose {

- public:

-  inline void operator()(int* x) const {

-    if (x && *x >= 0) {

-      if (HANDLE_EINTR(close(*x)) < 0)

-        PLOG(ERROR) << "close";

-    }

-  }

-};

-

-typedef scoped_ptr_malloc<int, ScopedFDClose> ScopedFD;

-#endif  // OS_POSIX

-

-// A class for enumerating the files in a provided path. The order of the

-// results is not guaranteed.

-//

-// DO NOT USE FROM THE MAIN THREAD of your application unless it is a test

-// program where latency does not matter. This class is blocking.

-class BASE_EXPORT FileEnumerator {

- public:

-#if defined(OS_WIN)

-  typedef WIN32_FIND_DATA FindInfo;

-#elif defined(OS_POSIX)

-  typedef struct {

-    struct stat stat;

-    std::string filename;

-  } FindInfo;

-#endif

-

-  enum FileType {

-    FILES                 = 1 << 0,

-    DIRECTORIES           = 1 << 1,

-    INCLUDE_DOT_DOT       = 1 << 2,

-#if defined(OS_POSIX)

-    SHOW_SYM_LINKS        = 1 << 4,

-#endif

-  };

-

-  // |root_path| is the starting directory to search for. It may or may not end

-  // in a slash.

-  //

-  // If |recursive| is true, this will enumerate all matches in any

-  // subdirectories matched as well. It does a breadth-first search, so all

-  // files in one directory will be returned before any files in a

-  // subdirectory.

-  //

-  // |file_type| specifies whether the enumerator should match files,

-  // directories, or both.

-  //

-  // |pattern| is an optional pattern for which files to match. This

-  // works like shell globbing. For example, "*.txt" or "Foo???.doc".

-  // However, be careful in specifying patterns that aren't cross platform

-  // since the underlying code uses OS-specific matching routines.  In general,

-  // Windows matching is less featureful than others, so test there first.

-  // If unspecified, this will match all files.

-  // NOTE: the pattern only matches the contents of root_path, not files in

-  // recursive subdirectories.

-  // TODO(erikkay): Fix the pattern matching to work at all levels.

-  FileEnumerator(const FilePath& root_path,

-                 bool recursive,

-                 FileType file_type);

-  FileEnumerator(const FilePath& root_path,

-                 bool recursive,

-                 FileType file_type,

-                 const FilePath::StringType& pattern);

-  ~FileEnumerator();

-

-  // Returns an empty string if there are no more results.

-  FilePath Next();

-

-  // Write the file info into |info|.

-  void GetFindInfo(FindInfo* info);

-

-  // Looks inside a FindInfo and determines if it's a directory.

-  static bool IsDirectory(const FindInfo& info);

-

-  static FilePath GetFilename(const FindInfo& find_info);

-  static int64 GetFilesize(const FindInfo& find_info);

-  static base::Time GetLastModifiedTime(const FindInfo& find_info);

-

- private:

-  // Returns true if the given path should be skipped in enumeration.

-  bool ShouldSkip(const FilePath& path);

-

-

-#if defined(OS_WIN)

-  // True when find_data_ is valid.

-  bool has_find_data_;

-  WIN32_FIND_DATA find_data_;

-  HANDLE find_handle_;

-#elif defined(OS_POSIX)

-  struct DirectoryEntryInfo {

-    FilePath filename;

-    struct stat stat;

-  };

-

-  // Read the filenames in source into the vector of DirectoryEntryInfo's

-  static bool ReadDirectory(std::vector<DirectoryEntryInfo>* entries,

-                            const FilePath& source, bool show_links);

-

-  // The files in the current directory

-  std::vector<DirectoryEntryInfo> directory_entries_;

-

-  // The next entry to use from the directory_entries_ vector

-  size_t current_directory_entry_;

-#endif

-

-  FilePath root_path_;

-  bool recursive_;

-  FileType file_type_;

-  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<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 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 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 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_WIN)

-  // Loads the file passed in as an image section and touches pages to avoid

-  // subsequent hard page faults during LoadLibrary. The size to be pre read

-  // is passed in. If it is 0 then the whole file is paged in. The step size

-  // which indicates the number of bytes to skip after every page touched is

-  // also passed in.

-bool BASE_EXPORT PreReadImage(const wchar_t* file_path, size_t size_to_read,

-                              size_t step_size);

-#endif  // OS_WIN

-

-#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 FilePath& path, FileSystemType* type);

-#endif

-

-}  // namespace file_util

-

-// Deprecated functions have been moved to this separate header file,

-// which must be included last after all the above definitions.

-#include "base/file_util_deprecated.h"

-

-#endif  // BASE_FILE_UTIL_H_

+// Copyright (c) 2011 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_
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_POSIX)
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+
+#include <stack>
+#include <string>
+#include <vector>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/platform_file.h"
+#include "base/string16.h"
+
+#if defined(OS_POSIX)
+#include "base/eintr_wrapper.h"
+#include "base/file_descriptor_posix.h"
+#include "base/logging.h"
+#endif
+
+namespace base {
+class Time;
+}
+
+namespace file_util {
+
+//-----------------------------------------------------------------------------
+// Functions that operate purely on a path string w/o touching the filesystem:
+
+// Returns true if the given path ends with a path separator character.
+BASE_EXPORT bool EndsWithSeparator(const FilePath& path);
+
+// Makes sure that |path| ends with a separator IFF path is a directory that
+// exists. Returns true if |path| is an existing directory, false otherwise.
+BASE_EXPORT bool EnsureEndsWithSeparator(FilePath* path);
+
+// Convert provided relative path into an absolute path.  Returns false on
+// error. On POSIX, this function fails if the path does not exist.
+BASE_EXPORT bool AbsolutePath(FilePath* path);
+
+// Returns true if |parent| contains |child|. Both paths are converted to
+// absolute paths before doing the comparison.
+BASE_EXPORT bool ContainsPath(const FilePath& parent, const FilePath& child);
+
+//-----------------------------------------------------------------------------
+// Functions that involve filesystem access or modification:
+
+// Returns the number of files matching the current path that were
+// created on or after the given |file_time|.  Doesn't count ".." or ".".
+//
+// Note for POSIX environments: a file created before |file_time|
+// can be mis-detected as a newer file due to low precision of
+// timestmap of file creation time. If you need to avoid such
+// mis-detection perfectly, you should wait one second before
+// obtaining |file_time|.
+BASE_EXPORT int CountFilesCreatedAfter(const FilePath& path,
+                                       const base::Time& file_time);
+
+// Returns the total number of bytes used by all the files under |root_path|.
+// If the path does not exist the function returns 0.
+//
+// This function is implemented using the FileEnumerator class so it is not
+// particularly speedy in any platform.
+BASE_EXPORT int64 ComputeDirectorySize(const FilePath& root_path);
+
+// Returns the total number of bytes used by all files matching the provided
+// |pattern|, on this |directory| (without recursion). If the path does not
+// exist the function returns 0.
+//
+// This function is implemented using the FileEnumerator class so it is not
+// particularly speedy in any platform.
+BASE_EXPORT int64 ComputeFilesSize(const FilePath& directory,
+                                   const FilePath::StringType& pattern);
+
+// Deletes the given path, whether it's a file or a directory.
+// If it's a directory, it's perfectly happy to delete all of the
+// directory's contents.  Passing true to recursive deletes
+// subdirectories and their contents as well.
+// Returns true if successful, false otherwise.
+//
+// WARNING: USING THIS WITH recursive==true IS EQUIVALENT
+//          TO "rm -rf", SO USE WITH CAUTION.
+BASE_EXPORT bool Delete(const FilePath& path, bool recursive);
+
+#if defined(OS_WIN)
+// Schedules to delete the given path, whether it's a file or a directory, until
+// the operating system is restarted.
+// Note:
+// 1) The file/directory to be deleted should exist in a temp folder.
+// 2) The directory to be deleted must be empty.
+BASE_EXPORT bool DeleteAfterReboot(const FilePath& path);
+#endif
+
+// Moves the given path, whether it's a file or a directory.
+// If a simple rename is not possible, such as in the case where the paths are
+// on different volumes, this will attempt to copy and delete. Returns
+// true for success.
+BASE_EXPORT bool Move(const FilePath& from_path, const FilePath& to_path);
+
+// Renames file |from_path| to |to_path|. Both paths must be on the same
+// volume, or the function will fail. Destination file will be created
+// if it doesn't exist. Prefer this function over Move when dealing with
+// temporary files. On Windows it preserves attributes of the target file.
+// Returns true on success.
+BASE_EXPORT bool ReplaceFile(const FilePath& from_path,
+                             const FilePath& to_path);
+
+// Copies a single file. Use CopyDirectory to copy directories.
+BASE_EXPORT bool CopyFile(const FilePath& from_path, const FilePath& to_path);
+
+// Copies the given path, and optionally all subdirectories and their contents
+// as well.
+// If there are files existing under to_path, always overwrite.
+// Returns true if successful, false otherwise.
+// Don't use wildcards on the names, it may stop working without notice.
+//
+// If you only need to copy a file use CopyFile, it's faster.
+BASE_EXPORT bool CopyDirectory(const FilePath& from_path,
+                               const FilePath& to_path,
+                               bool recursive);
+
+// Returns true if the given path exists on the local filesystem,
+// false otherwise.
+BASE_EXPORT bool PathExists(const FilePath& path);
+
+// Returns true if the given path is writable by the user, false otherwise.
+BASE_EXPORT bool PathIsWritable(const FilePath& path);
+
+// Returns true if the given path exists and is a directory, false otherwise.
+BASE_EXPORT bool DirectoryExists(const FilePath& path);
+
+#if defined(OS_WIN)
+// Gets the creation time of the given file (expressed in the local timezone),
+// and returns it via the creation_time parameter.  Returns true if successful,
+// false otherwise.
+BASE_EXPORT bool GetFileCreationLocalTime(const std::wstring& filename,
+                                          LPSYSTEMTIME creation_time);
+
+// Same as above, but takes a previously-opened file handle instead of a name.
+BASE_EXPORT bool GetFileCreationLocalTimeFromHandle(HANDLE file_handle,
+                                                    LPSYSTEMTIME creation_time);
+#endif  // defined(OS_WIN)
+
+// Returns true if the contents of the two files given are equal, false
+// otherwise.  If either file can't be read, returns false.
+BASE_EXPORT bool ContentsEqual(const FilePath& filename1,
+                               const FilePath& filename2);
+
+// Returns true if the contents of the two text files given are equal, false
+// otherwise.  This routine treats "\r\n" and "\n" as equivalent.
+BASE_EXPORT bool TextContentsEqual(const FilePath& filename1,
+                                   const FilePath& filename2);
+
+// Read the file at |path| into |contents|, returning true on success.
+// |contents| may be NULL, in which case this function is useful for its
+// side effect of priming the disk cache.
+// Useful for unit tests.
+BASE_EXPORT bool ReadFileToString(const FilePath& path, std::string* contents);
+
+#if defined(OS_POSIX)
+// Read exactly |bytes| bytes from file descriptor |fd|, storing the result
+// in |buffer|. This function is protected against EINTR and partial reads.
+// Returns true iff |bytes| bytes have been successfuly read from |fd|.
+BASE_EXPORT bool ReadFromFD(int fd, char* buffer, size_t bytes);
+
+// Creates a symbolic link at |symlink| pointing to |target|.  Returns
+// false on failure.
+BASE_EXPORT bool CreateSymbolicLink(const FilePath& target,
+                                    const FilePath& symlink);
+
+// Reads the given |symlink| and returns where it points to in |target|.
+// Returns false upon failure.
+BASE_EXPORT bool ReadSymbolicLink(const FilePath& symlink, FilePath* target);
+#endif  // defined(OS_POSIX)
+
+#if defined(OS_WIN)
+// Resolve Windows shortcut (.LNK file)
+// This methods tries to resolve a shortcut .LNK file. If the |path| is valid
+// returns true and puts the target into the |path|, otherwise returns
+// false leaving the path as it is.
+BASE_EXPORT bool ResolveShortcut(FilePath* path);
+
+// Create a Windows shortcut (.LNK file)
+// This method creates a shortcut link using the information given. Ensure
+// you have initialized COM before calling into this function. 'source'
+// and 'destination' parameters are required, everything else can be NULL.
+// 'source' is the existing file, 'destination' is the new link file to be
+// created; for best results pass the filename with the .lnk extension.
+// The 'icon' can specify a dll or exe in which case the icon index is the
+// resource id. 'app_id' is the app model id for the shortcut on Win7.
+// Note that if the shortcut exists it will overwrite it.
+BASE_EXPORT bool CreateShortcutLink(const wchar_t *source,
+                                    const wchar_t *destination,
+                                    const wchar_t *working_dir,
+                                    const wchar_t *arguments,
+                                    const wchar_t *description,
+                                    const wchar_t *icon,
+                                    int icon_index,
+                                    const wchar_t* app_id);
+
+// Update a Windows shortcut (.LNK file). This method assumes the shortcut
+// link already exists (otherwise false is returned). Ensure you have
+// initialized COM before calling into this function. Only 'destination'
+// parameter is required, everything else can be NULL (but if everything else
+// is NULL no changes are made to the shortcut). 'destination' is the link
+// file to be updated. 'app_id' is the app model id for the shortcut on Win7.
+// For best results pass the filename with the .lnk extension.
+BASE_EXPORT bool UpdateShortcutLink(const wchar_t *source,
+                                    const wchar_t *destination,
+                                    const wchar_t *working_dir,
+                                    const wchar_t *arguments,
+                                    const wchar_t *description,
+                                    const wchar_t *icon,
+                                    int icon_index,
+                                    const wchar_t* app_id);
+
+// Pins a shortcut to the Windows 7 taskbar. The shortcut file must already
+// exist and be a shortcut that points to an executable.
+BASE_EXPORT bool TaskbarPinShortcutLink(const wchar_t* shortcut);
+
+// Unpins a shortcut from the Windows 7 taskbar. The shortcut must exist and
+// already be pinned to the taskbar.
+BASE_EXPORT bool TaskbarUnpinShortcutLink(const wchar_t* shortcut);
+
+// Copy from_path to to_path recursively and then delete from_path recursively.
+// Returns true if all operations succeed.
+// This function simulates Move(), but unlike Move() it works across volumes.
+// This fuction is not transactional.
+BASE_EXPORT bool CopyAndDeleteDirectory(const FilePath& from_path,
+                                        const FilePath& to_path);
+#endif  // defined(OS_WIN)
+
+// Return true if the given directory is empty
+BASE_EXPORT bool IsDirectoryEmpty(const FilePath& dir_path);
+
+// Get the temporary directory provided by the system.
+// WARNING: DON'T USE THIS. If you want to create a temporary file, use one of
+// the functions below.
+BASE_EXPORT bool GetTempDir(FilePath* path);
+// Get a temporary directory for shared memory files.
+// Only useful on POSIX; redirects to GetTempDir() on Windows.
+BASE_EXPORT bool GetShmemTempDir(FilePath* path);
+
+// Get the home directory.  This is more complicated than just getenv("HOME")
+// as it knows to fall back on getpwent() etc.
+BASE_EXPORT FilePath GetHomeDir();
+
+// Creates a temporary file. The full path is placed in |path|, and the
+// function returns true if was successful in creating the file. The file will
+// be empty and all handles closed after this function returns.
+BASE_EXPORT bool CreateTemporaryFile(FilePath* path);
+
+// Same as CreateTemporaryFile but the file is created in |dir|.
+BASE_EXPORT bool CreateTemporaryFileInDir(const FilePath& dir,
+                                          FilePath* temp_file);
+
+// Create and open a temporary file.  File is opened for read/write.
+// The full path is placed in |path|.
+// Returns a handle to the opened file or NULL if an error occured.
+BASE_EXPORT FILE* CreateAndOpenTemporaryFile(FilePath* path);
+// Like above but for shmem files.  Only useful for POSIX.
+BASE_EXPORT FILE* CreateAndOpenTemporaryShmemFile(FilePath* path);
+// Similar to CreateAndOpenTemporaryFile, but the file is created in |dir|.
+BASE_EXPORT FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir,
+                                                  FilePath* path);
+
+// Create a new directory. If prefix is provided, the new directory name is in
+// the format of prefixyyyy.
+// NOTE: prefix is ignored in the POSIX implementation.
+// If success, return true and output the full path of the directory created.
+BASE_EXPORT bool CreateNewTempDirectory(const FilePath::StringType& prefix,
+                                        FilePath* new_temp_path);
+
+// Create a directory within another directory.
+// Extra characters will be appended to |prefix| to ensure that the
+// new directory does not have the same name as an existing directory.
+BASE_EXPORT bool CreateTemporaryDirInDir(const FilePath& base_dir,
+                                         const FilePath::StringType& prefix,
+                                         FilePath* new_dir);
+
+// Creates a directory, as well as creating any parent directories, if they
+// don't exist. Returns 'true' on successful creation, or if the directory
+// already exists.  The directory is only readable by the current user.
+BASE_EXPORT bool CreateDirectory(const FilePath& full_path);
+
+// Returns the file size. Returns true on success.
+BASE_EXPORT bool GetFileSize(const FilePath& file_path, int64* file_size);
+
+// Returns true if the given path's base name is ".".
+BASE_EXPORT bool IsDot(const FilePath& path);
+
+// Returns true if the given path's base name is "..".
+BASE_EXPORT bool IsDotDot(const FilePath& path);
+
+// Sets |real_path| to |path| with symbolic links and junctions expanded.
+// On windows, make sure the path starts with a lettered drive.
+// |path| must reference a file.  Function will fail if |path| points to
+// a directory or to a nonexistent path.  On windows, this function will
+// fail if |path| is a junction or symlink that points to an empty file,
+// or if |real_path| would be longer than MAX_PATH characters.
+BASE_EXPORT bool NormalizeFilePath(const FilePath& path, FilePath* real_path);
+
+#if defined(OS_WIN)
+// Given an existing file in |path|, it returns in |real_path| the path
+// in the native NT format, of the form "\Device\HarddiskVolumeXX\..".
+// Returns false it it fails. Empty files cannot be resolved with this
+// function.
+BASE_EXPORT bool NormalizeToNativeFilePath(const FilePath& path,
+                                           FilePath* nt_path);
+#endif
+
+// This function will return if the given file is a symlink or not.
+BASE_EXPORT bool IsLink(const FilePath& file_path);
+
+// Returns information about the given file path.
+BASE_EXPORT bool GetFileInfo(const FilePath& file_path,
+                             base::PlatformFileInfo* info);
+
+// Sets the time of the last access and the time of the last modification.
+BASE_EXPORT bool TouchFile(const FilePath& path,
+                           const base::Time& last_accessed,
+                           const base::Time& last_modified);
+
+// Set the time of the last modification. Useful for unit tests.
+BASE_EXPORT bool SetLastModifiedTime(const FilePath& path,
+                                     const base::Time& last_modified);
+
+#if defined(OS_POSIX)
+// Store inode number of |path| in |inode|. Return true on success.
+BASE_EXPORT bool GetInode(const FilePath& path, ino_t* inode);
+#endif
+
+// Wrapper for fopen-like calls. Returns non-NULL FILE* on success.
+BASE_EXPORT FILE* OpenFile(const FilePath& filename, const char* mode);
+
+// Closes file opened by OpenFile. Returns true on success.
+BASE_EXPORT bool CloseFile(FILE* file);
+
+// Truncates an open file to end at the location of the current file pointer.
+// This is a cross-platform analog to Windows' SetEndOfFile() function.
+BASE_EXPORT bool TruncateFile(FILE* file);
+
+// Reads the given number of bytes from the file into the buffer.  Returns
+// the number of read bytes, or -1 on error.
+BASE_EXPORT int ReadFile(const FilePath& filename, char* data, int size);
+
+// Writes the given buffer into the file, overwriting any data that was
+// previously there.  Returns the number of bytes written, or -1 on error.
+BASE_EXPORT int WriteFile(const FilePath& filename, const char* data, int size);
+#if defined(OS_POSIX)
+// Append the data to |fd|. Does not close |fd| when done.
+BASE_EXPORT int WriteFileDescriptor(const int fd, const char* data, int size);
+#endif
+
+// Gets the current working directory for the process.
+BASE_EXPORT bool GetCurrentDirectory(FilePath* path);
+
+// Sets the current working directory for the process.
+BASE_EXPORT bool SetCurrentDirectory(const FilePath& path);
+
+#if defined(OS_POSIX)
+// Test that |path| can only be changed by a specific user and group.
+// Specifically, test that all parts of |path| under (and including) |base|:
+// * Exist.
+// * Are owned by a specific user and group.
+// * Are not writable by all users.
+// * Are not symbolic links.
+// This is useful for checking that a config file is administrator-controlled.
+// |base| must contain |path|.
+BASE_EXPORT bool VerifyPathControlledByUser(const FilePath& base,
+                                            const FilePath& path,
+                                            uid_t owner_uid,
+                                            gid_t group_gid);
+#endif  // defined(OS_POSIX)
+
+#if defined(OS_MACOSX)
+// Is |path| writable only by a user with administrator privileges?
+// This function uses Mac OS conventions.  The super user is assumed to have
+// uid 0, and the administrator group is assumed to be named "admin".
+// Testing that |path|, and every parent directory including the root of
+// the filesystem, are owned by the superuser, controlled by the group
+// "admin", are not writable by all users, and contain no symbolic links.
+// Will return false if |path| does not exist.
+BASE_EXPORT bool VerifyPathControlledByAdmin(const FilePath& path);
+#endif  // defined(OS_MACOSX)
+
+// A class to handle auto-closing of FILE*'s.
+class ScopedFILEClose {
+ public:
+  inline void operator()(FILE* x) const {
+    if (x) {
+      fclose(x);
+    }
+  }
+};
+
+typedef scoped_ptr_malloc<FILE, ScopedFILEClose> ScopedFILE;
+
+#if defined(OS_POSIX)
+// A class to handle auto-closing of FDs.
+class ScopedFDClose {
+ public:
+  inline void operator()(int* x) const {
+    if (x && *x >= 0) {
+      if (HANDLE_EINTR(close(*x)) < 0)
+        PLOG(ERROR) << "close";
+    }
+  }
+};
+
+typedef scoped_ptr_malloc<int, ScopedFDClose> ScopedFD;
+#endif  // OS_POSIX
+
+// A class for enumerating the files in a provided path. The order of the
+// results is not guaranteed.
+//
+// DO NOT USE FROM THE MAIN THREAD of your application unless it is a test
+// program where latency does not matter. This class is blocking.
+class BASE_EXPORT FileEnumerator {
+ public:
+#if defined(OS_WIN)
+  typedef WIN32_FIND_DATA FindInfo;
+#elif defined(OS_POSIX)
+  typedef struct {
+    struct stat stat;
+    std::string filename;
+  } FindInfo;
+#endif
+
+  enum FileType {
+    FILES                 = 1 << 0,
+    DIRECTORIES           = 1 << 1,
+    INCLUDE_DOT_DOT       = 1 << 2,
+#if defined(OS_POSIX)
+    SHOW_SYM_LINKS        = 1 << 4,
+#endif
+  };
+
+  // |root_path| is the starting directory to search for. It may or may not end
+  // in a slash.
+  //
+  // If |recursive| is true, this will enumerate all matches in any
+  // subdirectories matched as well. It does a breadth-first search, so all
+  // files in one directory will be returned before any files in a
+  // subdirectory.
+  //
+  // |file_type| specifies whether the enumerator should match files,
+  // directories, or both.
+  //
+  // |pattern| is an optional pattern for which files to match. This
+  // works like shell globbing. For example, "*.txt" or "Foo???.doc".
+  // However, be careful in specifying patterns that aren't cross platform
+  // since the underlying code uses OS-specific matching routines.  In general,
+  // Windows matching is less featureful than others, so test there first.
+  // If unspecified, this will match all files.
+  // NOTE: the pattern only matches the contents of root_path, not files in
+  // recursive subdirectories.
+  // TODO(erikkay): Fix the pattern matching to work at all levels.
+  FileEnumerator(const FilePath& root_path,
+                 bool recursive,
+                 FileType file_type);
+  FileEnumerator(const FilePath& root_path,
+                 bool recursive,
+                 FileType file_type,
+                 const FilePath::StringType& pattern);
+  ~FileEnumerator();
+
+  // Returns an empty string if there are no more results.
+  FilePath Next();
+
+  // Write the file info into |info|.
+  void GetFindInfo(FindInfo* info);
+
+  // Looks inside a FindInfo and determines if it's a directory.
+  static bool IsDirectory(const FindInfo& info);
+
+  static FilePath GetFilename(const FindInfo& find_info);
+  static int64 GetFilesize(const FindInfo& find_info);
+  static base::Time GetLastModifiedTime(const FindInfo& find_info);
+
+ private:
+  // Returns true if the given path should be skipped in enumeration.
+  bool ShouldSkip(const FilePath& path);
+
+
+#if defined(OS_WIN)
+  // True when find_data_ is valid.
+  bool has_find_data_;
+  WIN32_FIND_DATA find_data_;
+  HANDLE find_handle_;
+#elif defined(OS_POSIX)
+  struct DirectoryEntryInfo {
+    FilePath filename;
+    struct stat stat;
+  };
+
+  // Read the filenames in source into the vector of DirectoryEntryInfo's
+  static bool ReadDirectory(std::vector<DirectoryEntryInfo>* entries,
+                            const FilePath& source, bool show_links);
+
+  // The files in the current directory
+  std::vector<DirectoryEntryInfo> directory_entries_;
+
+  // The next entry to use from the directory_entries_ vector
+  size_t current_directory_entry_;
+#endif
+
+  FilePath root_path_;
+  bool recursive_;
+  FileType file_type_;
+  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<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 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 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 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_WIN)
+  // Loads the file passed in as an image section and touches pages to avoid
+  // subsequent hard page faults during LoadLibrary. The size to be pre read
+  // is passed in. If it is 0 then the whole file is paged in. The step size
+  // which indicates the number of bytes to skip after every page touched is
+  // also passed in.
+bool BASE_EXPORT PreReadImage(const wchar_t* file_path, size_t size_to_read,
+                              size_t step_size);
+#endif  // OS_WIN
+
+#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 FilePath& path, FileSystemType* type);
+#endif
+
+}  // namespace file_util
+
+// Deprecated functions have been moved to this separate header file,
+// which must be included last after all the above definitions.
+#include "base/file_util_deprecated.h"
+
+#endif  // BASE_FILE_UTIL_H_