DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (d1ed7de67f5a)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
// 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 <fts.h>
#include <sys/stat.h>
#endif

#include <stdio.h>

#include <stack>
#include <string>
#include <vector>

#include "base/basictypes.h"
#include "base/scoped_ptr.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.  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.
bool Delete(const FilePath& path, bool recursive);
// Deprecated temporary compatibility function.
bool Delete(const std::wstring& path, bool recursive);

// 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);

// 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.
// Dont'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.
bool CopyDirectory(const FilePath& from_path, const FilePath& to_path,
                   bool recursive);
// Deprecated temporary compatibility function.
bool CopyDirectory(const std::wstring& from_path, const std::wstring& to_path,
                   bool recursive);

// 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_