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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/file_util.h" | |
| 6 | |
| 7 #include <windows.h> | |
| 8 #include <io.h> | |
| 9 #include <psapi.h> | |
| 10 #include <shellapi.h> | |
| 11 #include <shlobj.h> | |
| 12 #include <time.h> | |
| 13 | |
| 14 #include <algorithm> | |
| 15 #include <limits> | |
| 16 #include <string> | |
| 17 | |
| 18 #include "base/files/file_enumerator.h" | |
| 19 #include "base/files/file_path.h" | |
| 20 #include "base/logging.h" | |
| 21 #include "base/metrics/histogram.h" | |
| 22 #include "base/process/process_handle.h" | |
| 23 #include "base/rand_util.h" | |
| 24 #include "base/strings/string_number_conversions.h" | |
| 25 #include "base/strings/string_util.h" | |
| 26 #include "base/strings/utf_string_conversions.h" | |
| 27 #include "base/threading/thread_restrictions.h" | |
| 28 #include "base/time/time.h" | |
| 29 #include "base/win/scoped_handle.h" | |
| 30 #include "base/win/windows_version.h" | |
| 31 | |
| 32 namespace base { | |
| 33 | |
| 34 namespace { | |
| 35 | |
| 36 const DWORD kFileShareAll = | |
| 37 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE; | |
| 38 | |
| 39 } // namespace | |
| 40 | |
| 41 FilePath MakeAbsoluteFilePath(const FilePath& input) { | |
| 42 ThreadRestrictions::AssertIOAllowed(); | |
| 43 wchar_t file_path[MAX_PATH]; | |
| 44 if (!_wfullpath(file_path, input.value().c_str(), MAX_PATH)) | |
| 45 return FilePath(); | |
| 46 return FilePath(file_path); | |
| 47 } | |
| 48 | |
| 49 bool DeleteFile(const FilePath& path, bool recursive) { | |
| 50 ThreadRestrictions::AssertIOAllowed(); | |
| 51 | |
| 52 if (path.value().length() >= MAX_PATH) | |
| 53 return false; | |
| 54 | |
| 55 // On XP SHFileOperation will return ERROR_ACCESS_DENIED instead of | |
| 56 // ERROR_FILE_NOT_FOUND, so just shortcut this here. | |
| 57 if (path.empty()) | |
| 58 return true; | |
| 59 | |
| 60 if (!recursive) { | |
| 61 // If not recursing, then first check to see if |path| is a directory. | |
| 62 // If it is, then remove it with RemoveDirectory. | |
| 63 File::Info file_info; | |
| 64 if (GetFileInfo(path, &file_info) && file_info.is_directory) | |
| 65 return RemoveDirectory(path.value().c_str()) != 0; | |
| 66 | |
| 67 // Otherwise, it's a file, wildcard or non-existant. Try DeleteFile first | |
| 68 // because it should be faster. If DeleteFile fails, then we fall through | |
| 69 // to SHFileOperation, which will do the right thing. | |
| 70 if (::DeleteFile(path.value().c_str()) != 0) | |
| 71 return true; | |
| 72 } | |
| 73 | |
| 74 // SHFILEOPSTRUCT wants the path to be terminated with two NULLs, | |
| 75 // so we have to use wcscpy because wcscpy_s writes non-NULLs | |
| 76 // into the rest of the buffer. | |
| 77 wchar_t double_terminated_path[MAX_PATH + 1] = {0}; | |
| 78 #pragma warning(suppress:4996) // don't complain about wcscpy deprecation | |
| 79 wcscpy(double_terminated_path, path.value().c_str()); | |
| 80 | |
| 81 SHFILEOPSTRUCT file_operation = {0}; | |
| 82 file_operation.wFunc = FO_DELETE; | |
| 83 file_operation.pFrom = double_terminated_path; | |
| 84 file_operation.fFlags = FOF_NOERRORUI | FOF_SILENT | FOF_NOCONFIRMATION; | |
| 85 if (!recursive) | |
| 86 file_operation.fFlags |= FOF_NORECURSION | FOF_FILESONLY; | |
| 87 int err = SHFileOperation(&file_operation); | |
| 88 | |
| 89 // Since we're passing flags to the operation telling it to be silent, | |
| 90 // it's possible for the operation to be aborted/cancelled without err | |
| 91 // being set (although MSDN doesn't give any scenarios for how this can | |
| 92 // happen). See MSDN for SHFileOperation and SHFILEOPTSTRUCT. | |
| 93 if (file_operation.fAnyOperationsAborted) | |
| 94 return false; | |
| 95 | |
| 96 // Some versions of Windows return ERROR_FILE_NOT_FOUND (0x2) when deleting | |
| 97 // an empty directory and some return 0x402 when they should be returning | |
| 98 // ERROR_FILE_NOT_FOUND. MSDN says Vista and up won't return 0x402. Windows 7 | |
| 99 // can return DE_INVALIDFILES (0x7C) for nonexistent directories. | |
| 100 return (err == 0 || err == ERROR_FILE_NOT_FOUND || err == 0x402 || | |
| 101 err == 0x7C); | |
| 102 } | |
| 103 | |
| 104 bool DeleteFileAfterReboot(const FilePath& path) { | |
| 105 ThreadRestrictions::AssertIOAllowed(); | |
| 106 | |
| 107 if (path.value().length() >= MAX_PATH) | |
| 108 return false; | |
| 109 | |
| 110 return MoveFileEx(path.value().c_str(), NULL, | |
| 111 MOVEFILE_DELAY_UNTIL_REBOOT | | |
| 112 MOVEFILE_REPLACE_EXISTING) != FALSE; | |
| 113 } | |
| 114 | |
| 115 bool ReplaceFile(const FilePath& from_path, | |
| 116 const FilePath& to_path, | |
| 117 File::Error* error) { | |
| 118 ThreadRestrictions::AssertIOAllowed(); | |
| 119 // Try a simple move first. It will only succeed when |to_path| doesn't | |
| 120 // already exist. | |
| 121 if (::MoveFile(from_path.value().c_str(), to_path.value().c_str())) | |
| 122 return true; | |
| 123 // Try the full-blown replace if the move fails, as ReplaceFile will only | |
| 124 // succeed when |to_path| does exist. When writing to a network share, we may | |
| 125 // not be able to change the ACLs. Ignore ACL errors then | |
| 126 // (REPLACEFILE_IGNORE_MERGE_ERRORS). | |
| 127 if (::ReplaceFile(to_path.value().c_str(), from_path.value().c_str(), NULL, | |
| 128 REPLACEFILE_IGNORE_MERGE_ERRORS, NULL, NULL)) { | |
| 129 return true; | |
| 130 } | |
| 131 if (error) | |
| 132 *error = File::OSErrorToFileError(GetLastError()); | |
| 133 return false; | |
| 134 } | |
| 135 | |
| 136 bool CopyDirectory(const FilePath& from_path, const FilePath& to_path, | |
| 137 bool recursive) { | |
| 138 // NOTE(maruel): Previous version of this function used to call | |
| 139 // SHFileOperation(). This used to copy the file attributes and extended | |
| 140 // attributes, OLE structured storage, NTFS file system alternate data | |
| 141 // streams, SECURITY_DESCRIPTOR. In practice, this is not what we want, we | |
| 142 // want the containing directory to propagate its SECURITY_DESCRIPTOR. | |
| 143 ThreadRestrictions::AssertIOAllowed(); | |
| 144 | |
| 145 // NOTE: I suspect we could support longer paths, but that would involve | |
| 146 // analyzing all our usage of files. | |
| 147 if (from_path.value().length() >= MAX_PATH || | |
| 148 to_path.value().length() >= MAX_PATH) { | |
| 149 return false; | |
| 150 } | |
| 151 | |
| 152 // This function does not properly handle destinations within the source. | |
| 153 FilePath real_to_path = to_path; | |
| 154 if (PathExists(real_to_path)) { | |
| 155 real_to_path = MakeAbsoluteFilePath(real_to_path); | |
| 156 if (real_to_path.empty()) | |
| 157 return false; | |
| 158 } else { | |
| 159 real_to_path = MakeAbsoluteFilePath(real_to_path.DirName()); | |
| 160 if (real_to_path.empty()) | |
| 161 return false; | |
| 162 } | |
| 163 FilePath real_from_path = MakeAbsoluteFilePath(from_path); | |
| 164 if (real_from_path.empty()) | |
| 165 return false; | |
| 166 if (real_to_path.value().size() >= real_from_path.value().size() && | |
| 167 real_to_path.value().compare(0, real_from_path.value().size(), | |
| 168 real_from_path.value()) == 0) { | |
| 169 return false; | |
| 170 } | |
| 171 | |
| 172 int traverse_type = FileEnumerator::FILES; | |
| 173 if (recursive) | |
| 174 traverse_type |= FileEnumerator::DIRECTORIES; | |
| 175 FileEnumerator traversal(from_path, recursive, traverse_type); | |
| 176 | |
| 177 if (!PathExists(from_path)) { | |
| 178 DLOG(ERROR) << "CopyDirectory() couldn't stat source directory: " | |
| 179 << from_path.value().c_str(); | |
| 180 return false; | |
| 181 } | |
| 182 // TODO(maruel): This is not necessary anymore. | |
| 183 DCHECK(recursive || DirectoryExists(from_path)); | |
| 184 | |
| 185 FilePath current = from_path; | |
| 186 bool from_is_dir = DirectoryExists(from_path); | |
| 187 bool success = true; | |
| 188 FilePath from_path_base = from_path; | |
| 189 if (recursive && DirectoryExists(to_path)) { | |
| 190 // If the destination already exists and is a directory, then the | |
| 191 // top level of source needs to be copied. | |
| 192 from_path_base = from_path.DirName(); | |
| 193 } | |
| 194 | |
| 195 while (success && !current.empty()) { | |
| 196 // current is the source path, including from_path, so append | |
| 197 // the suffix after from_path to to_path to create the target_path. | |
| 198 FilePath target_path(to_path); | |
| 199 if (from_path_base != current) { | |
| 200 if (!from_path_base.AppendRelativePath(current, &target_path)) { | |
| 201 success = false; | |
| 202 break; | |
| 203 } | |
| 204 } | |
| 205 | |
| 206 if (from_is_dir) { | |
| 207 if (!DirectoryExists(target_path) && | |
| 208 !::CreateDirectory(target_path.value().c_str(), NULL)) { | |
| 209 DLOG(ERROR) << "CopyDirectory() couldn't create directory: " | |
| 210 << target_path.value().c_str(); | |
| 211 success = false; | |
| 212 } | |
| 213 } else if (!internal::CopyFileUnsafe(current, target_path)) { | |
| 214 DLOG(ERROR) << "CopyDirectory() couldn't create file: " | |
| 215 << target_path.value().c_str(); | |
| 216 success = false; | |
| 217 } | |
| 218 | |
| 219 current = traversal.Next(); | |
| 220 if (!current.empty()) | |
| 221 from_is_dir = traversal.GetInfo().IsDirectory(); | |
| 222 } | |
| 223 | |
| 224 return success; | |
| 225 } | |
| 226 | |
| 227 bool PathExists(const FilePath& path) { | |
| 228 ThreadRestrictions::AssertIOAllowed(); | |
| 229 return (GetFileAttributes(path.value().c_str()) != INVALID_FILE_ATTRIBUTES); | |
| 230 } | |
| 231 | |
| 232 bool PathIsWritable(const FilePath& path) { | |
| 233 ThreadRestrictions::AssertIOAllowed(); | |
| 234 HANDLE dir = | |
| 235 CreateFile(path.value().c_str(), FILE_ADD_FILE, kFileShareAll, | |
| 236 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL); | |
| 237 | |
| 238 if (dir == INVALID_HANDLE_VALUE) | |
| 239 return false; | |
| 240 | |
| 241 CloseHandle(dir); | |
| 242 return true; | |
| 243 } | |
| 244 | |
| 245 bool DirectoryExists(const FilePath& path) { | |
| 246 ThreadRestrictions::AssertIOAllowed(); | |
| 247 DWORD fileattr = GetFileAttributes(path.value().c_str()); | |
| 248 if (fileattr != INVALID_FILE_ATTRIBUTES) | |
| 249 return (fileattr & FILE_ATTRIBUTE_DIRECTORY) != 0; | |
| 250 return false; | |
| 251 } | |
| 252 | |
| 253 bool GetTempDir(FilePath* path) { | |
| 254 wchar_t temp_path[MAX_PATH + 1]; | |
| 255 DWORD path_len = ::GetTempPath(MAX_PATH, temp_path); | |
| 256 if (path_len >= MAX_PATH || path_len <= 0) | |
| 257 return false; | |
| 258 // TODO(evanm): the old behavior of this function was to always strip the | |
| 259 // trailing slash. We duplicate this here, but it shouldn't be necessary | |
| 260 // when everyone is using the appropriate FilePath APIs. | |
| 261 *path = FilePath(temp_path).StripTrailingSeparators(); | |
| 262 return true; | |
| 263 } | |
| 264 | |
| 265 FilePath GetHomeDir() { | |
| 266 char16 result[MAX_PATH]; | |
| 267 if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PROFILE, NULL, SHGFP_TYPE_CURRENT, | |
| 268 result)) && | |
| 269 result[0]) { | |
| 270 return FilePath(result); | |
| 271 } | |
| 272 | |
| 273 // Fall back to the temporary directory on failure. | |
| 274 FilePath temp; | |
| 275 if (GetTempDir(&temp)) | |
| 276 return temp; | |
| 277 | |
| 278 // Last resort. | |
| 279 return FilePath(L"C:\\"); | |
| 280 } | |
| 281 | |
| 282 bool CreateTemporaryFile(FilePath* path) { | |
| 283 ThreadRestrictions::AssertIOAllowed(); | |
| 284 | |
| 285 FilePath temp_file; | |
| 286 | |
| 287 if (!GetTempDir(path)) | |
| 288 return false; | |
| 289 | |
| 290 if (CreateTemporaryFileInDir(*path, &temp_file)) { | |
| 291 *path = temp_file; | |
| 292 return true; | |
| 293 } | |
| 294 | |
| 295 return false; | |
| 296 } | |
| 297 | |
| 298 // On POSIX we have semantics to create and open a temporary file | |
| 299 // atomically. | |
| 300 // TODO(jrg): is there equivalent call to use on Windows instead of | |
| 301 // going 2-step? | |
| 302 FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir, FilePath* path) { | |
| 303 ThreadRestrictions::AssertIOAllowed(); | |
| 304 if (!CreateTemporaryFileInDir(dir, path)) { | |
| 305 return NULL; | |
| 306 } | |
| 307 // Open file in binary mode, to avoid problems with fwrite. On Windows | |
| 308 // it replaces \n's with \r\n's, which may surprise you. | |
| 309 // Reference: http://msdn.microsoft.com/en-us/library/h9t88zwz(VS.71).aspx | |
| 310 return OpenFile(*path, "wb+"); | |
| 311 } | |
| 312 | |
| 313 bool CreateTemporaryFileInDir(const FilePath& dir, FilePath* temp_file) { | |
| 314 ThreadRestrictions::AssertIOAllowed(); | |
| 315 | |
| 316 wchar_t temp_name[MAX_PATH + 1]; | |
| 317 | |
| 318 if (!GetTempFileName(dir.value().c_str(), L"", 0, temp_name)) { | |
| 319 DPLOG(WARNING) << "Failed to get temporary file name in " | |
| 320 << UTF16ToUTF8(dir.value()); | |
| 321 return false; | |
| 322 } | |
| 323 | |
| 324 wchar_t long_temp_name[MAX_PATH + 1]; | |
| 325 DWORD long_name_len = GetLongPathName(temp_name, long_temp_name, MAX_PATH); | |
| 326 if (long_name_len > MAX_PATH || long_name_len == 0) { | |
| 327 // GetLongPathName() failed, but we still have a temporary file. | |
| 328 *temp_file = FilePath(temp_name); | |
| 329 return true; | |
| 330 } | |
| 331 | |
| 332 FilePath::StringType long_temp_name_str; | |
| 333 long_temp_name_str.assign(long_temp_name, long_name_len); | |
| 334 *temp_file = FilePath(long_temp_name_str); | |
| 335 return true; | |
| 336 } | |
| 337 | |
| 338 bool CreateTemporaryDirInDir(const FilePath& base_dir, | |
| 339 const FilePath::StringType& prefix, | |
| 340 FilePath* new_dir) { | |
| 341 ThreadRestrictions::AssertIOAllowed(); | |
| 342 | |
| 343 FilePath path_to_create; | |
| 344 | |
| 345 for (int count = 0; count < 50; ++count) { | |
| 346 // Try create a new temporary directory with random generated name. If | |
| 347 // the one exists, keep trying another path name until we reach some limit. | |
| 348 string16 new_dir_name; | |
| 349 new_dir_name.assign(prefix); | |
| 350 new_dir_name.append(IntToString16(GetCurrentProcId())); | |
| 351 new_dir_name.push_back('_'); | |
| 352 new_dir_name.append(IntToString16(RandInt(0, kint16max))); | |
| 353 | |
| 354 path_to_create = base_dir.Append(new_dir_name); | |
| 355 if (::CreateDirectory(path_to_create.value().c_str(), NULL)) { | |
| 356 *new_dir = path_to_create; | |
| 357 return true; | |
| 358 } | |
| 359 } | |
| 360 | |
| 361 return false; | |
| 362 } | |
| 363 | |
| 364 bool CreateNewTempDirectory(const FilePath::StringType& prefix, | |
| 365 FilePath* new_temp_path) { | |
| 366 ThreadRestrictions::AssertIOAllowed(); | |
| 367 | |
| 368 FilePath system_temp_dir; | |
| 369 if (!GetTempDir(&system_temp_dir)) | |
| 370 return false; | |
| 371 | |
| 372 return CreateTemporaryDirInDir(system_temp_dir, prefix, new_temp_path); | |
| 373 } | |
| 374 | |
| 375 bool CreateDirectoryAndGetError(const FilePath& full_path, | |
| 376 File::Error* error) { | |
| 377 ThreadRestrictions::AssertIOAllowed(); | |
| 378 | |
| 379 // If the path exists, we've succeeded if it's a directory, failed otherwise. | |
| 380 const wchar_t* full_path_str = full_path.value().c_str(); | |
| 381 DWORD fileattr = ::GetFileAttributes(full_path_str); | |
| 382 if (fileattr != INVALID_FILE_ATTRIBUTES) { | |
| 383 if ((fileattr & FILE_ATTRIBUTE_DIRECTORY) != 0) { | |
| 384 DVLOG(1) << "CreateDirectory(" << full_path_str << "), " | |
| 385 << "directory already exists."; | |
| 386 return true; | |
| 387 } | |
| 388 DLOG(WARNING) << "CreateDirectory(" << full_path_str << "), " | |
| 389 << "conflicts with existing file."; | |
| 390 if (error) { | |
| 391 *error = File::FILE_ERROR_NOT_A_DIRECTORY; | |
| 392 } | |
| 393 return false; | |
| 394 } | |
| 395 | |
| 396 // Invariant: Path does not exist as file or directory. | |
| 397 | |
| 398 // Attempt to create the parent recursively. This will immediately return | |
| 399 // true if it already exists, otherwise will create all required parent | |
| 400 // directories starting with the highest-level missing parent. | |
| 401 FilePath parent_path(full_path.DirName()); | |
| 402 if (parent_path.value() == full_path.value()) { | |
| 403 if (error) { | |
| 404 *error = File::FILE_ERROR_NOT_FOUND; | |
| 405 } | |
| 406 return false; | |
| 407 } | |
| 408 if (!CreateDirectoryAndGetError(parent_path, error)) { | |
| 409 DLOG(WARNING) << "Failed to create one of the parent directories."; | |
| 410 if (error) { | |
| 411 DCHECK(*error != File::FILE_OK); | |
| 412 } | |
| 413 return false; | |
| 414 } | |
| 415 | |
| 416 if (!::CreateDirectory(full_path_str, NULL)) { | |
| 417 DWORD error_code = ::GetLastError(); | |
| 418 if (error_code == ERROR_ALREADY_EXISTS && DirectoryExists(full_path)) { | |
| 419 // This error code ERROR_ALREADY_EXISTS doesn't indicate whether we | |
| 420 // were racing with someone creating the same directory, or a file | |
| 421 // with the same path. If DirectoryExists() returns true, we lost the | |
| 422 // race to create the same directory. | |
| 423 return true; | |
| 424 } else { | |
| 425 if (error) | |
| 426 *error = File::OSErrorToFileError(error_code); | |
| 427 DLOG(WARNING) << "Failed to create directory " << full_path_str | |
| 428 << ", last error is " << error_code << "."; | |
| 429 return false; | |
| 430 } | |
| 431 } else { | |
| 432 return true; | |
| 433 } | |
| 434 } | |
| 435 | |
| 436 bool NormalizeFilePath(const FilePath& path, FilePath* real_path) { | |
| 437 ThreadRestrictions::AssertIOAllowed(); | |
| 438 FilePath mapped_file; | |
| 439 if (!NormalizeToNativeFilePath(path, &mapped_file)) | |
| 440 return false; | |
| 441 // NormalizeToNativeFilePath() will return a path that starts with | |
| 442 // "\Device\Harddisk...". Helper DevicePathToDriveLetterPath() | |
| 443 // will find a drive letter which maps to the path's device, so | |
| 444 // that we return a path starting with a drive letter. | |
| 445 return DevicePathToDriveLetterPath(mapped_file, real_path); | |
| 446 } | |
| 447 | |
| 448 bool DevicePathToDriveLetterPath(const FilePath& nt_device_path, | |
| 449 FilePath* out_drive_letter_path) { | |
| 450 ThreadRestrictions::AssertIOAllowed(); | |
| 451 | |
| 452 // Get the mapping of drive letters to device paths. | |
| 453 const int kDriveMappingSize = 1024; | |
| 454 wchar_t drive_mapping[kDriveMappingSize] = {'\0'}; | |
| 455 if (!::GetLogicalDriveStrings(kDriveMappingSize - 1, drive_mapping)) { | |
| 456 DLOG(ERROR) << "Failed to get drive mapping."; | |
| 457 return false; | |
| 458 } | |
| 459 | |
| 460 // The drive mapping is a sequence of null terminated strings. | |
| 461 // The last string is empty. | |
| 462 wchar_t* drive_map_ptr = drive_mapping; | |
| 463 wchar_t device_path_as_string[MAX_PATH]; | |
| 464 wchar_t drive[] = L" :"; | |
| 465 | |
| 466 // For each string in the drive mapping, get the junction that links | |
| 467 // to it. If that junction is a prefix of |device_path|, then we | |
| 468 // know that |drive| is the real path prefix. | |
| 469 while (*drive_map_ptr) { | |
| 470 drive[0] = drive_map_ptr[0]; // Copy the drive letter. | |
| 471 | |
| 472 if (QueryDosDevice(drive, device_path_as_string, MAX_PATH)) { | |
| 473 FilePath device_path(device_path_as_string); | |
| 474 if (device_path == nt_device_path || | |
| 475 device_path.IsParent(nt_device_path)) { | |
| 476 *out_drive_letter_path = FilePath(drive + | |
| 477 nt_device_path.value().substr(wcslen(device_path_as_string))); | |
| 478 return true; | |
| 479 } | |
| 480 } | |
| 481 // Move to the next drive letter string, which starts one | |
| 482 // increment after the '\0' that terminates the current string. | |
| 483 while (*drive_map_ptr++); | |
| 484 } | |
| 485 | |
| 486 // No drive matched. The path does not start with a device junction | |
| 487 // that is mounted as a drive letter. This means there is no drive | |
| 488 // letter path to the volume that holds |device_path|, so fail. | |
| 489 return false; | |
| 490 } | |
| 491 | |
| 492 bool NormalizeToNativeFilePath(const FilePath& path, FilePath* nt_path) { | |
| 493 ThreadRestrictions::AssertIOAllowed(); | |
| 494 // In Vista, GetFinalPathNameByHandle() would give us the real path | |
| 495 // from a file handle. If we ever deprecate XP, consider changing the | |
| 496 // code below to a call to GetFinalPathNameByHandle(). The method this | |
| 497 // function uses is explained in the following msdn article: | |
| 498 // http://msdn.microsoft.com/en-us/library/aa366789(VS.85).aspx | |
| 499 base::win::ScopedHandle file_handle( | |
| 500 ::CreateFile(path.value().c_str(), | |
| 501 GENERIC_READ, | |
| 502 kFileShareAll, | |
| 503 NULL, | |
| 504 OPEN_EXISTING, | |
| 505 FILE_ATTRIBUTE_NORMAL, | |
| 506 NULL)); | |
| 507 if (!file_handle) | |
| 508 return false; | |
| 509 | |
| 510 // Create a file mapping object. Can't easily use MemoryMappedFile, because | |
| 511 // we only map the first byte, and need direct access to the handle. You can | |
| 512 // not map an empty file, this call fails in that case. | |
| 513 base::win::ScopedHandle file_map_handle( | |
| 514 ::CreateFileMapping(file_handle.Get(), | |
| 515 NULL, | |
| 516 PAGE_READONLY, | |
| 517 0, | |
| 518 1, // Just one byte. No need to look at the data. | |
| 519 NULL)); | |
| 520 if (!file_map_handle) | |
| 521 return false; | |
| 522 | |
| 523 // Use a view of the file to get the path to the file. | |
| 524 void* file_view = MapViewOfFile(file_map_handle.Get(), | |
| 525 FILE_MAP_READ, 0, 0, 1); | |
| 526 if (!file_view) | |
| 527 return false; | |
| 528 | |
| 529 // The expansion of |path| into a full path may make it longer. | |
| 530 // GetMappedFileName() will fail if the result is longer than MAX_PATH. | |
| 531 // Pad a bit to be safe. If kMaxPathLength is ever changed to be less | |
| 532 // than MAX_PATH, it would be nessisary to test that GetMappedFileName() | |
| 533 // not return kMaxPathLength. This would mean that only part of the | |
| 534 // path fit in |mapped_file_path|. | |
| 535 const int kMaxPathLength = MAX_PATH + 10; | |
| 536 wchar_t mapped_file_path[kMaxPathLength]; | |
| 537 bool success = false; | |
| 538 HANDLE cp = GetCurrentProcess(); | |
| 539 if (::GetMappedFileNameW(cp, file_view, mapped_file_path, kMaxPathLength)) { | |
| 540 *nt_path = FilePath(mapped_file_path); | |
| 541 success = true; | |
| 542 } | |
| 543 ::UnmapViewOfFile(file_view); | |
| 544 return success; | |
| 545 } | |
| 546 | |
| 547 // TODO(rkc): Work out if we want to handle NTFS junctions here or not, handle | |
| 548 // them if we do decide to. | |
| 549 bool IsLink(const FilePath& file_path) { | |
| 550 return false; | |
| 551 } | |
| 552 | |
| 553 bool GetFileInfo(const FilePath& file_path, File::Info* results) { | |
| 554 ThreadRestrictions::AssertIOAllowed(); | |
| 555 | |
| 556 WIN32_FILE_ATTRIBUTE_DATA attr; | |
| 557 if (!GetFileAttributesEx(file_path.value().c_str(), | |
| 558 GetFileExInfoStandard, &attr)) { | |
| 559 return false; | |
| 560 } | |
| 561 | |
| 562 ULARGE_INTEGER size; | |
| 563 size.HighPart = attr.nFileSizeHigh; | |
| 564 size.LowPart = attr.nFileSizeLow; | |
| 565 results->size = size.QuadPart; | |
| 566 | |
| 567 results->is_directory = | |
| 568 (attr.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0; | |
| 569 results->last_modified = Time::FromFileTime(attr.ftLastWriteTime); | |
| 570 results->last_accessed = Time::FromFileTime(attr.ftLastAccessTime); | |
| 571 results->creation_time = Time::FromFileTime(attr.ftCreationTime); | |
| 572 | |
| 573 return true; | |
| 574 } | |
| 575 | |
| 576 FILE* OpenFile(const FilePath& filename, const char* mode) { | |
| 577 ThreadRestrictions::AssertIOAllowed(); | |
| 578 std::wstring w_mode = ASCIIToWide(std::string(mode)); | |
| 579 return _wfsopen(filename.value().c_str(), w_mode.c_str(), _SH_DENYNO); | |
| 580 } | |
| 581 | |
| 582 FILE* FileToFILE(File file, const char* mode) { | |
| 583 if (!file.IsValid()) | |
| 584 return NULL; | |
| 585 int fd = | |
| 586 _open_osfhandle(reinterpret_cast<intptr_t>(file.GetPlatformFile()), 0); | |
| 587 if (fd < 0) | |
| 588 return NULL; | |
| 589 file.TakePlatformFile(); | |
| 590 FILE* stream = _fdopen(fd, mode); | |
| 591 if (!stream) | |
| 592 _close(fd); | |
| 593 return stream; | |
| 594 } | |
| 595 | |
| 596 int ReadFile(const FilePath& filename, char* data, int max_size) { | |
| 597 ThreadRestrictions::AssertIOAllowed(); | |
| 598 base::win::ScopedHandle file(CreateFile(filename.value().c_str(), | |
| 599 GENERIC_READ, | |
| 600 FILE_SHARE_READ | FILE_SHARE_WRITE, | |
| 601 NULL, | |
| 602 OPEN_EXISTING, | |
| 603 FILE_FLAG_SEQUENTIAL_SCAN, | |
| 604 NULL)); | |
| 605 if (!file) | |
| 606 return -1; | |
| 607 | |
| 608 DWORD read; | |
| 609 if (::ReadFile(file, data, max_size, &read, NULL)) | |
| 610 return read; | |
| 611 | |
| 612 return -1; | |
| 613 } | |
| 614 | |
| 615 int WriteFile(const FilePath& filename, const char* data, int size) { | |
| 616 ThreadRestrictions::AssertIOAllowed(); | |
| 617 base::win::ScopedHandle file(CreateFile(filename.value().c_str(), | |
| 618 GENERIC_WRITE, | |
| 619 0, | |
| 620 NULL, | |
| 621 CREATE_ALWAYS, | |
| 622 0, | |
| 623 NULL)); | |
| 624 if (!file) { | |
| 625 DPLOG(WARNING) << "CreateFile failed for path " | |
| 626 << UTF16ToUTF8(filename.value()); | |
| 627 return -1; | |
| 628 } | |
| 629 | |
| 630 DWORD written; | |
| 631 BOOL result = ::WriteFile(file, data, size, &written, NULL); | |
| 632 if (result && static_cast<int>(written) == size) | |
| 633 return written; | |
| 634 | |
| 635 if (!result) { | |
| 636 // WriteFile failed. | |
| 637 DPLOG(WARNING) << "writing file " << UTF16ToUTF8(filename.value()) | |
| 638 << " failed"; | |
| 639 } else { | |
| 640 // Didn't write all the bytes. | |
| 641 DLOG(WARNING) << "wrote" << written << " bytes to " | |
| 642 << UTF16ToUTF8(filename.value()) << " expected " << size; | |
| 643 } | |
| 644 return -1; | |
| 645 } | |
| 646 | |
| 647 int AppendToFile(const FilePath& filename, const char* data, int size) { | |
| 648 ThreadRestrictions::AssertIOAllowed(); | |
| 649 base::win::ScopedHandle file(CreateFile(filename.value().c_str(), | |
| 650 FILE_APPEND_DATA, | |
| 651 0, | |
| 652 NULL, | |
| 653 OPEN_EXISTING, | |
| 654 0, | |
| 655 NULL)); | |
| 656 if (!file) { | |
| 657 DPLOG(WARNING) << "CreateFile failed for path " | |
| 658 << UTF16ToUTF8(filename.value()); | |
| 659 return -1; | |
| 660 } | |
| 661 | |
| 662 DWORD written; | |
| 663 BOOL result = ::WriteFile(file, data, size, &written, NULL); | |
| 664 if (result && static_cast<int>(written) == size) | |
| 665 return written; | |
| 666 | |
| 667 if (!result) { | |
| 668 // WriteFile failed. | |
| 669 DPLOG(WARNING) << "writing file " << UTF16ToUTF8(filename.value()) | |
| 670 << " failed"; | |
| 671 } else { | |
| 672 // Didn't write all the bytes. | |
| 673 DLOG(WARNING) << "wrote" << written << " bytes to " | |
| 674 << UTF16ToUTF8(filename.value()) << " expected " << size; | |
| 675 } | |
| 676 return -1; | |
| 677 } | |
| 678 | |
| 679 // Gets the current working directory for the process. | |
| 680 bool GetCurrentDirectory(FilePath* dir) { | |
| 681 ThreadRestrictions::AssertIOAllowed(); | |
| 682 | |
| 683 wchar_t system_buffer[MAX_PATH]; | |
| 684 system_buffer[0] = 0; | |
| 685 DWORD len = ::GetCurrentDirectory(MAX_PATH, system_buffer); | |
| 686 if (len == 0 || len > MAX_PATH) | |
| 687 return false; | |
| 688 // TODO(evanm): the old behavior of this function was to always strip the | |
| 689 // trailing slash. We duplicate this here, but it shouldn't be necessary | |
| 690 // when everyone is using the appropriate FilePath APIs. | |
| 691 std::wstring dir_str(system_buffer); | |
| 692 *dir = FilePath(dir_str).StripTrailingSeparators(); | |
| 693 return true; | |
| 694 } | |
| 695 | |
| 696 // Sets the current working directory for the process. | |
| 697 bool SetCurrentDirectory(const FilePath& directory) { | |
| 698 ThreadRestrictions::AssertIOAllowed(); | |
| 699 BOOL ret = ::SetCurrentDirectory(directory.value().c_str()); | |
| 700 return ret != 0; | |
| 701 } | |
| 702 | |
| 703 int GetMaximumPathComponentLength(const FilePath& path) { | |
| 704 ThreadRestrictions::AssertIOAllowed(); | |
| 705 | |
| 706 wchar_t volume_path[MAX_PATH]; | |
| 707 if (!GetVolumePathNameW(path.NormalizePathSeparators().value().c_str(), | |
| 708 volume_path, | |
| 709 arraysize(volume_path))) { | |
| 710 return -1; | |
| 711 } | |
| 712 | |
| 713 DWORD max_length = 0; | |
| 714 if (!GetVolumeInformationW(volume_path, NULL, 0, NULL, &max_length, NULL, | |
| 715 NULL, 0)) { | |
| 716 return -1; | |
| 717 } | |
| 718 | |
| 719 // Length of |path| with path separator appended. | |
| 720 size_t prefix = path.StripTrailingSeparators().value().size() + 1; | |
| 721 // The whole path string must be shorter than MAX_PATH. That is, it must be | |
| 722 // prefix + component_length < MAX_PATH (or equivalently, <= MAX_PATH - 1). | |
| 723 int whole_path_limit = std::max(0, MAX_PATH - 1 - static_cast<int>(prefix)); | |
| 724 return std::min(whole_path_limit, static_cast<int>(max_length)); | |
| 725 } | |
| 726 | |
| 727 // ----------------------------------------------------------------------------- | |
| 728 | |
| 729 namespace internal { | |
| 730 | |
| 731 bool MoveUnsafe(const FilePath& from_path, const FilePath& to_path) { | |
| 732 ThreadRestrictions::AssertIOAllowed(); | |
| 733 | |
| 734 // NOTE: I suspect we could support longer paths, but that would involve | |
| 735 // analyzing all our usage of files. | |
| 736 if (from_path.value().length() >= MAX_PATH || | |
| 737 to_path.value().length() >= MAX_PATH) { | |
| 738 return false; | |
| 739 } | |
| 740 if (MoveFileEx(from_path.value().c_str(), to_path.value().c_str(), | |
| 741 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING) != 0) | |
| 742 return true; | |
| 743 | |
| 744 // Keep the last error value from MoveFileEx around in case the below | |
| 745 // fails. | |
| 746 bool ret = false; | |
| 747 DWORD last_error = ::GetLastError(); | |
| 748 | |
| 749 if (DirectoryExists(from_path)) { | |
| 750 // MoveFileEx fails if moving directory across volumes. We will simulate | |
| 751 // the move by using Copy and Delete. Ideally we could check whether | |
| 752 // from_path and to_path are indeed in different volumes. | |
| 753 ret = internal::CopyAndDeleteDirectory(from_path, to_path); | |
| 754 } | |
| 755 | |
| 756 if (!ret) { | |
| 757 // Leave a clue about what went wrong so that it can be (at least) picked | |
| 758 // up by a PLOG entry. | |
| 759 ::SetLastError(last_error); | |
| 760 } | |
| 761 | |
| 762 return ret; | |
| 763 } | |
| 764 | |
| 765 bool CopyFileUnsafe(const FilePath& from_path, const FilePath& to_path) { | |
| 766 ThreadRestrictions::AssertIOAllowed(); | |
| 767 | |
| 768 // NOTE: I suspect we could support longer paths, but that would involve | |
| 769 // analyzing all our usage of files. | |
| 770 if (from_path.value().length() >= MAX_PATH || | |
| 771 to_path.value().length() >= MAX_PATH) { | |
| 772 return false; | |
| 773 } | |
| 774 | |
| 775 // Unlike the posix implementation that copies the file manually and discards | |
| 776 // the ACL bits, CopyFile() copies the complete SECURITY_DESCRIPTOR and access | |
| 777 // bits, which is usually not what we want. We can't do much about the | |
| 778 // SECURITY_DESCRIPTOR but at least remove the read only bit. | |
| 779 const wchar_t* dest = to_path.value().c_str(); | |
| 780 if (!::CopyFile(from_path.value().c_str(), dest, false)) { | |
| 781 // Copy failed. | |
| 782 return false; | |
| 783 } | |
| 784 DWORD attrs = GetFileAttributes(dest); | |
| 785 if (attrs == INVALID_FILE_ATTRIBUTES) { | |
| 786 return false; | |
| 787 } | |
| 788 if (attrs & FILE_ATTRIBUTE_READONLY) { | |
| 789 SetFileAttributes(dest, attrs & ~FILE_ATTRIBUTE_READONLY); | |
| 790 } | |
| 791 return true; | |
| 792 } | |
| 793 | |
| 794 bool CopyAndDeleteDirectory(const FilePath& from_path, | |
| 795 const FilePath& to_path) { | |
| 796 ThreadRestrictions::AssertIOAllowed(); | |
| 797 if (CopyDirectory(from_path, to_path, true)) { | |
| 798 if (DeleteFile(from_path, true)) | |
| 799 return true; | |
| 800 | |
| 801 // Like Move, this function is not transactional, so we just | |
| 802 // leave the copied bits behind if deleting from_path fails. | |
| 803 // If to_path exists previously then we have already overwritten | |
| 804 // it by now, we don't get better off by deleting the new bits. | |
| 805 } | |
| 806 return false; | |
| 807 } | |
| 808 | |
| 809 } // namespace internal | |
| 810 } // namespace base | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 468253002:
Move file_util to base/files/ directory. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src