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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006-2008 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_
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(ANDROID)
+#include <sys/stat.h>
+#elif defined(OS_POSIX) 
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+
+#include <stdio.h>
+
+#include <stack>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/file_path.h"
+
+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.
+bool EndsWithSeparator(const FilePath& path);
+// These two versions are both deprecated. TODO(estade): remove them.
+bool EndsWithSeparator(std::wstring* path);
+bool EndsWithSeparator(const std::wstring& path);
+
+// Modifies a string by trimming all trailing separators from the end.
+// Deprecated. FilePath does this automatically, and if it's constructed from a
+// path with a trailing separator, StripTrailingSeparators() may be used.
+void TrimTrailingSeparator(std::wstring* dir);
+
+// Strips the topmost directory from the end of 'dir'.  Assumes 'dir' does not
+// refer to a file.
+// If 'dir' is a root directory, return without change.
+// Deprecated. Use FilePath::DirName instead.
+void UpOneDirectory(std::wstring* dir);
+
+// Returns the filename portion of 'path', without any leading \'s or /'s.
+// Deprecated. Use FilePath::BaseName instead.
+std::wstring GetFilenameFromPath(const std::wstring& path);
+
+// Deprecated compatibility function.  Use FilePath::Extension.
+FilePath::StringType GetFileExtensionFromPath(const FilePath& path);
+// Deprecated temporary compatibility function.
+std::wstring GetFileExtensionFromPath(const std::wstring& path);
+
+// Appends new_ending to path, adding a separator between the two if necessary.
+void AppendToPath(std::wstring* path, const std::wstring& new_ending);
+
+// Convert provided relative path into an absolute path.  Returns false on
+// error. On POSIX, this function fails if the path does not exist.
+bool AbsolutePath(FilePath* path);
+// Deprecated temporary compatibility function.
+bool AbsolutePath(std::wstring* path);
+
+// Deprecated compatibility function.  Use FilePath::InsertBeforeExtension.
+void InsertBeforeExtension(FilePath* path, const FilePath::StringType& suffix);
+
+// Deprecated compatibility function.  Use FilePath::ReplaceExtension.
+void ReplaceExtension(FilePath* file_name,
+                      const FilePath::StringType& extension);
+
+#if defined(OS_WIN)
+// Deprecated temporary compatibility functions.
+void InsertBeforeExtension(std::wstring* path, const std::wstring& suffix);
+void ReplaceExtension(std::wstring* file_name, const std::wstring& extension);
+#endif
+
+//-----------------------------------------------------------------------------
+// Functions that involve filesystem access or modification:
+
+// 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.
+// Returns true if successful, false otherwise.
+bool Delete(const FilePath& path);
+// Deprecated temporary compatibility function.
+bool Delete(const std::wstring& path);
+
+// Copies a single file. Use CopyDirectory to copy directories.
+bool CopyFile(const FilePath& from_path, const FilePath& to_path);
+// Deprecated temporary compatibility function.
+bool CopyFile(const std::wstring& from_path, const std::wstring& to_path);
+
+// Returns true if the given path exists on the local filesystem,
+// false otherwise.
+bool PathExists(const FilePath& path);
+// Deprecated temporary compatibility function.
+bool PathExists(const std::wstring& path);
+
+// Returns true if the given path is writable by the user, false otherwise.
+bool PathIsWritable(const FilePath& path);
+// Deprecated temporary compatibility function.
+bool PathIsWritable(const std::wstring& path);
+
+// Returns true if the given path exists and is a directory, false otherwise.
+bool DirectoryExists(const FilePath& path);
+// Deprecated temporary compatibility function.
+bool DirectoryExists(const std::wstring& path);
+
+#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|.
+bool ReadFromFD(int fd, char* buffer, size_t bytes);
+#endif  // defined(OS_POSIX)
+
+// Get the temporary directory provided by the system.
+bool GetTempDir(FilePath* path);
+// Deprecated temporary compatibility function.
+bool GetTempDir(std::wstring* path);
+// Get a temporary directory for shared memory files.
+// Only useful on POSIX; redirects to GetTempDir() on Windows.
+bool GetShmemTempDir(FilePath* path);
+
+// 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.
+// TODO(erikkay): rename this function and track down all of the callers.
+// (Clarification of erik's comment: the intent is to rename the BlahFileName()
+//  calls into BlahFile(), since they create temp files (not temp filenames).)
+bool CreateTemporaryFileName(FilePath* path);
+// Deprecated temporary compatibility function.
+bool CreateTemporaryFileName(std::wstring* temp_file);
+
+// Create and open a temporary file.  File is opened for read/write.
+// The full path is placed in |path|, and the function returns true if
+// was successful in creating and opening the file.
+FILE* CreateAndOpenTemporaryFile(FilePath* path);
+// Like above but for shmem files.  Only useful for POSIX.
+FILE* CreateAndOpenTemporaryShmemFile(FilePath* path);
+
+// Similar to CreateAndOpenTemporaryFile, but the file is created in |dir|.
+FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir, FilePath* path);
+
+// Same as CreateTemporaryFileName but the file is created in |dir|.
+bool CreateTemporaryFileNameInDir(const std::wstring& dir,
+                                  std::wstring* temp_file);
+
+// Create a new directory under TempPath. If prefix is provided, the new
+// directory name is in the format of prefixyyyy.
+// NOTE: prefix is ignored in the POSIX implementation.
+// TODO(erikkay): is this OK?
+// If success, return true and output the full path of the directory created.
+bool CreateNewTempDirectory(const FilePath::StringType& prefix,
+                            FilePath* new_temp_path);
+// Deprecated temporary compatibility function.
+bool CreateNewTempDirectory(const std::wstring& prefix,
+                            std::wstring* new_temp_path);
+
+// 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.
+bool CreateDirectory(const FilePath& full_path);
+// Deprecated temporary compatibility function.
+bool CreateDirectory(const std::wstring& full_path);
+
+// Returns the file size. Returns true on success.
+bool GetFileSize(const FilePath& file_path, int64_t* file_size);
+// Deprecated temporary compatibility function.
+bool GetFileSize(const std::wstring& file_path, int64_t* file_size);
+
+// Used to hold information about a given file path.  See GetFileInfo below.
+struct FileInfo {
+  // The size of the file in bytes.  Undefined when is_directory is true.
+  int64_t size;
+
+  // True if the file corresponds to a directory.
+  bool is_directory;
+
+  // Add additional fields here as needed.
+};
+
+// Returns information about the given file path.
+bool GetFileInfo(const FilePath& file_path, FileInfo* info);
+// Deprecated temporary compatibility function.
+bool GetFileInfo(const std::wstring& file_path, FileInfo* info);
+
+// Wrapper for fopen-like calls. Returns non-NULL FILE* on success.
+FILE* OpenFile(const FilePath& filename, const char* mode);
+// Deprecated temporary compatibility functions.
+FILE* OpenFile(const std::string& filename, const char* mode);
+FILE* OpenFile(const std::wstring& filename, const char* mode);
+
+// Closes file opened by OpenFile. Returns true on success.
+bool CloseFile(FILE* file);
+
+// Reads the given number of bytes from the file into the buffer.  Returns
+// the number of read bytes, or -1 on error.
+int ReadFile(const FilePath& filename, char* data, int size);
+// Deprecated temporary compatibility function.
+int ReadFile(const std::wstring& 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.
+int WriteFile(const FilePath& filename, const char* data, int size);
+// Deprecated temporary compatibility function.
+int WriteFile(const std::wstring& filename, const char* data, int size);
+
+// Gets the current working directory for the process.
+bool GetCurrentDirectory(FilePath* path);
+// Deprecated temporary compatibility function.
+bool GetCurrentDirectory(std::wstring* path);
+
+// Sets the current working directory for the process.
+bool SetCurrentDirectory(const FilePath& path);
+// Deprecated temporary compatibility function.
+bool SetCurrentDirectory(const std::wstring& current_directory);
+
+}  // namespace file_util
+
+#endif  // BASE_FILE_UTIL_H_