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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/win/registry.h" | |
| 6 | |
| 7 #include <shlwapi.h> | |
| 8 #include <algorithm> | |
| 9 | |
| 10 #include "base/logging.h" | |
| 11 #include "base/strings/string_util.h" | |
| 12 #include "base/threading/thread_restrictions.h" | |
| 13 #include "base/win/windows_version.h" | |
| 14 | |
| 15 namespace base { | |
| 16 namespace win { | |
| 17 | |
| 18 namespace { | |
| 19 | |
| 20 // RegEnumValue() reports the number of characters from the name that were | |
| 21 // written to the buffer, not how many there are. This constant is the maximum | |
| 22 // name size, such that a buffer with this size should read any name. | |
| 23 const DWORD MAX_REGISTRY_NAME_SIZE = 16384; | |
| 24 | |
| 25 // Registry values are read as BYTE* but can have wchar_t* data whose last | |
| 26 // wchar_t is truncated. This function converts the reported |byte_size| to | |
| 27 // a size in wchar_t that can store a truncated wchar_t if necessary. | |
| 28 inline DWORD to_wchar_size(DWORD byte_size) { | |
| 29 return (byte_size + sizeof(wchar_t) - 1) / sizeof(wchar_t); | |
| 30 } | |
| 31 | |
| 32 // Mask to pull WOW64 access flags out of REGSAM access. | |
| 33 const REGSAM kWow64AccessMask = KEY_WOW64_32KEY | KEY_WOW64_64KEY; | |
| 34 | |
| 35 } // namespace | |
| 36 | |
| 37 // Watches for modifications to a key. | |
| 38 class RegKey::Watcher : public ObjectWatcher::Delegate { | |
| 39 public: | |
| 40 explicit Watcher(RegKey* owner) : owner_(owner) {} | |
| 41 ~Watcher() override {} | |
| 42 | |
| 43 bool StartWatching(HKEY key, const ChangeCallback& callback); | |
| 44 | |
| 45 // Implementation of ObjectWatcher::Delegate. | |
| 46 void OnObjectSignaled(HANDLE object) override { | |
| 47 DCHECK(watch_event_.IsValid() && watch_event_.Get() == object); | |
| 48 ChangeCallback callback = callback_; | |
| 49 callback_.Reset(); | |
| 50 callback.Run(); | |
| 51 } | |
| 52 | |
| 53 private: | |
| 54 RegKey* owner_; | |
| 55 ScopedHandle watch_event_; | |
| 56 ObjectWatcher object_watcher_; | |
| 57 ChangeCallback callback_; | |
| 58 DISALLOW_COPY_AND_ASSIGN(Watcher); | |
| 59 }; | |
| 60 | |
| 61 bool RegKey::Watcher::StartWatching(HKEY key, const ChangeCallback& callback) { | |
| 62 DCHECK(key); | |
| 63 DCHECK(callback_.is_null()); | |
| 64 | |
| 65 if (!watch_event_.IsValid()) | |
| 66 watch_event_.Set(CreateEvent(NULL, TRUE, FALSE, NULL)); | |
| 67 | |
| 68 if (!watch_event_.IsValid()) | |
| 69 return false; | |
| 70 | |
| 71 DWORD filter = REG_NOTIFY_CHANGE_NAME | | |
| 72 REG_NOTIFY_CHANGE_ATTRIBUTES | | |
| 73 REG_NOTIFY_CHANGE_LAST_SET | | |
| 74 REG_NOTIFY_CHANGE_SECURITY; | |
| 75 | |
| 76 // Watch the registry key for a change of value. | |
| 77 LONG result = RegNotifyChangeKeyValue(key, TRUE, filter, watch_event_.Get(), | |
| 78 TRUE); | |
| 79 if (result != ERROR_SUCCESS) { | |
| 80 watch_event_.Close(); | |
| 81 return false; | |
| 82 } | |
| 83 | |
| 84 callback_ = callback; | |
| 85 return object_watcher_.StartWatching(watch_event_.Get(), this); | |
| 86 } | |
| 87 | |
| 88 // RegKey ---------------------------------------------------------------------- | |
| 89 | |
| 90 RegKey::RegKey() : key_(NULL), wow64access_(0) { | |
| 91 } | |
| 92 | |
| 93 RegKey::RegKey(HKEY key) : key_(key), wow64access_(0) { | |
| 94 } | |
| 95 | |
| 96 RegKey::RegKey(HKEY rootkey, const wchar_t* subkey, REGSAM access) | |
| 97 : key_(NULL), | |
| 98 wow64access_(0) { | |
| 99 if (rootkey) { | |
| 100 if (access & (KEY_SET_VALUE | KEY_CREATE_SUB_KEY | KEY_CREATE_LINK)) | |
| 101 Create(rootkey, subkey, access); | |
| 102 else | |
| 103 Open(rootkey, subkey, access); | |
| 104 } else { | |
| 105 DCHECK(!subkey); | |
| 106 wow64access_ = access & kWow64AccessMask; | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 RegKey::~RegKey() { | |
| 111 Close(); | |
| 112 } | |
| 113 | |
| 114 LONG RegKey::Create(HKEY rootkey, const wchar_t* subkey, REGSAM access) { | |
| 115 DWORD disposition_value; | |
| 116 return CreateWithDisposition(rootkey, subkey, &disposition_value, access); | |
| 117 } | |
| 118 | |
| 119 LONG RegKey::CreateWithDisposition(HKEY rootkey, const wchar_t* subkey, | |
| 120 DWORD* disposition, REGSAM access) { | |
| 121 DCHECK(rootkey && subkey && access && disposition); | |
| 122 HKEY subhkey = NULL; | |
| 123 LONG result = RegCreateKeyEx(rootkey, subkey, 0, NULL, | |
| 124 REG_OPTION_NON_VOLATILE, access, NULL, &subhkey, | |
| 125 disposition); | |
| 126 if (result == ERROR_SUCCESS) { | |
| 127 Close(); | |
| 128 key_ = subhkey; | |
| 129 wow64access_ = access & kWow64AccessMask; | |
| 130 } | |
| 131 | |
| 132 return result; | |
| 133 } | |
| 134 | |
| 135 LONG RegKey::CreateKey(const wchar_t* name, REGSAM access) { | |
| 136 DCHECK(name && access); | |
| 137 // After the application has accessed an alternate registry view using one of | |
| 138 // the [KEY_WOW64_32KEY / KEY_WOW64_64KEY] flags, all subsequent operations | |
| 139 // (create, delete, or open) on child registry keys must explicitly use the | |
| 140 // same flag. Otherwise, there can be unexpected behavior. | |
| 141 // http://msdn.microsoft.com/en-us/library/windows/desktop/aa384129.aspx. | |
| 142 if ((access & kWow64AccessMask) != wow64access_) { | |
| 143 NOTREACHED(); | |
| 144 return ERROR_INVALID_PARAMETER; | |
| 145 } | |
| 146 HKEY subkey = NULL; | |
| 147 LONG result = RegCreateKeyEx(key_, name, 0, NULL, REG_OPTION_NON_VOLATILE, | |
| 148 access, NULL, &subkey, NULL); | |
| 149 if (result == ERROR_SUCCESS) { | |
| 150 Close(); | |
| 151 key_ = subkey; | |
| 152 wow64access_ = access & kWow64AccessMask; | |
| 153 } | |
| 154 | |
| 155 return result; | |
| 156 } | |
| 157 | |
| 158 LONG RegKey::Open(HKEY rootkey, const wchar_t* subkey, REGSAM access) { | |
| 159 DCHECK(rootkey && subkey && access); | |
| 160 HKEY subhkey = NULL; | |
| 161 | |
| 162 LONG result = RegOpenKeyEx(rootkey, subkey, 0, access, &subhkey); | |
| 163 if (result == ERROR_SUCCESS) { | |
| 164 Close(); | |
| 165 key_ = subhkey; | |
| 166 wow64access_ = access & kWow64AccessMask; | |
| 167 } | |
| 168 | |
| 169 return result; | |
| 170 } | |
| 171 | |
| 172 LONG RegKey::OpenKey(const wchar_t* relative_key_name, REGSAM access) { | |
| 173 DCHECK(relative_key_name && access); | |
| 174 // After the application has accessed an alternate registry view using one of | |
| 175 // the [KEY_WOW64_32KEY / KEY_WOW64_64KEY] flags, all subsequent operations | |
| 176 // (create, delete, or open) on child registry keys must explicitly use the | |
| 177 // same flag. Otherwise, there can be unexpected behavior. | |
| 178 // http://msdn.microsoft.com/en-us/library/windows/desktop/aa384129.aspx. | |
| 179 if ((access & kWow64AccessMask) != wow64access_) { | |
| 180 NOTREACHED(); | |
| 181 return ERROR_INVALID_PARAMETER; | |
| 182 } | |
| 183 HKEY subkey = NULL; | |
| 184 LONG result = RegOpenKeyEx(key_, relative_key_name, 0, access, &subkey); | |
| 185 | |
| 186 // We have to close the current opened key before replacing it with the new | |
| 187 // one. | |
| 188 if (result == ERROR_SUCCESS) { | |
| 189 Close(); | |
| 190 key_ = subkey; | |
| 191 wow64access_ = access & kWow64AccessMask; | |
| 192 } | |
| 193 return result; | |
| 194 } | |
| 195 | |
| 196 void RegKey::Close() { | |
| 197 if (key_) { | |
| 198 ::RegCloseKey(key_); | |
| 199 key_ = NULL; | |
| 200 wow64access_ = 0; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 // TODO(wfh): Remove this and other unsafe methods. See http://crbug.com/375400 | |
| 205 void RegKey::Set(HKEY key) { | |
| 206 if (key_ != key) { | |
| 207 Close(); | |
| 208 key_ = key; | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 HKEY RegKey::Take() { | |
| 213 DCHECK_EQ(wow64access_, 0u); | |
| 214 HKEY key = key_; | |
| 215 key_ = NULL; | |
| 216 return key; | |
| 217 } | |
| 218 | |
| 219 bool RegKey::HasValue(const wchar_t* name) const { | |
| 220 return RegQueryValueEx(key_, name, 0, NULL, NULL, NULL) == ERROR_SUCCESS; | |
| 221 } | |
| 222 | |
| 223 DWORD RegKey::GetValueCount() const { | |
| 224 DWORD count = 0; | |
| 225 LONG result = RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL, NULL, &count, | |
| 226 NULL, NULL, NULL, NULL); | |
| 227 return (result == ERROR_SUCCESS) ? count : 0; | |
| 228 } | |
| 229 | |
| 230 LONG RegKey::GetValueNameAt(int index, std::wstring* name) const { | |
| 231 wchar_t buf[256]; | |
| 232 DWORD bufsize = arraysize(buf); | |
| 233 LONG r = ::RegEnumValue(key_, index, buf, &bufsize, NULL, NULL, NULL, NULL); | |
| 234 if (r == ERROR_SUCCESS) | |
| 235 *name = buf; | |
| 236 | |
| 237 return r; | |
| 238 } | |
| 239 | |
| 240 LONG RegKey::DeleteKey(const wchar_t* name) { | |
| 241 DCHECK(key_); | |
| 242 DCHECK(name); | |
| 243 HKEY subkey = NULL; | |
| 244 | |
| 245 // Verify the key exists before attempting delete to replicate previous | |
| 246 // behavior. | |
| 247 LONG result = | |
| 248 RegOpenKeyEx(key_, name, 0, READ_CONTROL | wow64access_, &subkey); | |
| 249 if (result != ERROR_SUCCESS) | |
| 250 return result; | |
| 251 RegCloseKey(subkey); | |
| 252 | |
| 253 return RegDelRecurse(key_, std::wstring(name), wow64access_); | |
| 254 } | |
| 255 | |
| 256 LONG RegKey::DeleteEmptyKey(const wchar_t* name) { | |
| 257 DCHECK(key_); | |
| 258 DCHECK(name); | |
| 259 | |
| 260 HKEY target_key = NULL; | |
| 261 LONG result = RegOpenKeyEx(key_, name, 0, KEY_READ | wow64access_, | |
| 262 &target_key); | |
| 263 | |
| 264 if (result != ERROR_SUCCESS) | |
| 265 return result; | |
| 266 | |
| 267 DWORD count = 0; | |
| 268 result = RegQueryInfoKey(target_key, NULL, 0, NULL, NULL, NULL, NULL, &count, | |
| 269 NULL, NULL, NULL, NULL); | |
| 270 | |
| 271 RegCloseKey(target_key); | |
| 272 | |
| 273 if (result != ERROR_SUCCESS) | |
| 274 return result; | |
| 275 | |
| 276 if (count == 0) | |
| 277 return RegDeleteKeyExWrapper(key_, name, wow64access_, 0); | |
| 278 | |
| 279 return ERROR_DIR_NOT_EMPTY; | |
| 280 } | |
| 281 | |
| 282 LONG RegKey::DeleteValue(const wchar_t* value_name) { | |
| 283 DCHECK(key_); | |
| 284 LONG result = RegDeleteValue(key_, value_name); | |
| 285 return result; | |
| 286 } | |
| 287 | |
| 288 LONG RegKey::ReadValueDW(const wchar_t* name, DWORD* out_value) const { | |
| 289 DCHECK(out_value); | |
| 290 DWORD type = REG_DWORD; | |
| 291 DWORD size = sizeof(DWORD); | |
| 292 DWORD local_value = 0; | |
| 293 LONG result = ReadValue(name, &local_value, &size, &type); | |
| 294 if (result == ERROR_SUCCESS) { | |
| 295 if ((type == REG_DWORD || type == REG_BINARY) && size == sizeof(DWORD)) | |
| 296 *out_value = local_value; | |
| 297 else | |
| 298 result = ERROR_CANTREAD; | |
| 299 } | |
| 300 | |
| 301 return result; | |
| 302 } | |
| 303 | |
| 304 LONG RegKey::ReadInt64(const wchar_t* name, int64* out_value) const { | |
| 305 DCHECK(out_value); | |
| 306 DWORD type = REG_QWORD; | |
| 307 int64 local_value = 0; | |
| 308 DWORD size = sizeof(local_value); | |
| 309 LONG result = ReadValue(name, &local_value, &size, &type); | |
| 310 if (result == ERROR_SUCCESS) { | |
| 311 if ((type == REG_QWORD || type == REG_BINARY) && | |
| 312 size == sizeof(local_value)) | |
| 313 *out_value = local_value; | |
| 314 else | |
| 315 result = ERROR_CANTREAD; | |
| 316 } | |
| 317 | |
| 318 return result; | |
| 319 } | |
| 320 | |
| 321 LONG RegKey::ReadValue(const wchar_t* name, std::wstring* out_value) const { | |
| 322 DCHECK(out_value); | |
| 323 const size_t kMaxStringLength = 1024; // This is after expansion. | |
| 324 // Use the one of the other forms of ReadValue if 1024 is too small for you. | |
| 325 wchar_t raw_value[kMaxStringLength]; | |
| 326 DWORD type = REG_SZ, size = sizeof(raw_value); | |
| 327 LONG result = ReadValue(name, raw_value, &size, &type); | |
| 328 if (result == ERROR_SUCCESS) { | |
| 329 if (type == REG_SZ) { | |
| 330 *out_value = raw_value; | |
| 331 } else if (type == REG_EXPAND_SZ) { | |
| 332 wchar_t expanded[kMaxStringLength]; | |
| 333 size = ExpandEnvironmentStrings(raw_value, expanded, kMaxStringLength); | |
| 334 // Success: returns the number of wchar_t's copied | |
| 335 // Fail: buffer too small, returns the size required | |
| 336 // Fail: other, returns 0 | |
| 337 if (size == 0 || size > kMaxStringLength) { | |
| 338 result = ERROR_MORE_DATA; | |
| 339 } else { | |
| 340 *out_value = expanded; | |
| 341 } | |
| 342 } else { | |
| 343 // Not a string. Oops. | |
| 344 result = ERROR_CANTREAD; | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 return result; | |
| 349 } | |
| 350 | |
| 351 LONG RegKey::ReadValue(const wchar_t* name, | |
| 352 void* data, | |
| 353 DWORD* dsize, | |
| 354 DWORD* dtype) const { | |
| 355 LONG result = RegQueryValueEx(key_, name, 0, dtype, | |
| 356 reinterpret_cast<LPBYTE>(data), dsize); | |
| 357 return result; | |
| 358 } | |
| 359 | |
| 360 LONG RegKey::ReadValues(const wchar_t* name, | |
| 361 std::vector<std::wstring>* values) { | |
| 362 values->clear(); | |
| 363 | |
| 364 DWORD type = REG_MULTI_SZ; | |
| 365 DWORD size = 0; | |
| 366 LONG result = ReadValue(name, NULL, &size, &type); | |
| 367 if (FAILED(result) || size == 0) | |
| 368 return result; | |
| 369 | |
| 370 if (type != REG_MULTI_SZ) | |
| 371 return ERROR_CANTREAD; | |
| 372 | |
| 373 std::vector<wchar_t> buffer(size / sizeof(wchar_t)); | |
| 374 result = ReadValue(name, &buffer[0], &size, NULL); | |
| 375 if (FAILED(result) || size == 0) | |
| 376 return result; | |
| 377 | |
| 378 // Parse the double-null-terminated list of strings. | |
| 379 // Note: This code is paranoid to not read outside of |buf|, in the case where | |
| 380 // it may not be properly terminated. | |
| 381 const wchar_t* entry = &buffer[0]; | |
| 382 const wchar_t* buffer_end = entry + (size / sizeof(wchar_t)); | |
| 383 while (entry < buffer_end && entry[0] != '\0') { | |
| 384 const wchar_t* entry_end = std::find(entry, buffer_end, L'\0'); | |
| 385 values->push_back(std::wstring(entry, entry_end)); | |
| 386 entry = entry_end + 1; | |
| 387 } | |
| 388 return 0; | |
| 389 } | |
| 390 | |
| 391 LONG RegKey::WriteValue(const wchar_t* name, DWORD in_value) { | |
| 392 return WriteValue( | |
| 393 name, &in_value, static_cast<DWORD>(sizeof(in_value)), REG_DWORD); | |
| 394 } | |
| 395 | |
| 396 LONG RegKey::WriteValue(const wchar_t * name, const wchar_t* in_value) { | |
| 397 return WriteValue(name, in_value, | |
| 398 static_cast<DWORD>(sizeof(*in_value) * (wcslen(in_value) + 1)), REG_SZ); | |
| 399 } | |
| 400 | |
| 401 LONG RegKey::WriteValue(const wchar_t* name, | |
| 402 const void* data, | |
| 403 DWORD dsize, | |
| 404 DWORD dtype) { | |
| 405 DCHECK(data || !dsize); | |
| 406 | |
| 407 LONG result = RegSetValueEx(key_, name, 0, dtype, | |
| 408 reinterpret_cast<LPBYTE>(const_cast<void*>(data)), dsize); | |
| 409 return result; | |
| 410 } | |
| 411 | |
| 412 bool RegKey::StartWatching(const ChangeCallback& callback) { | |
| 413 if (!key_watcher_) | |
| 414 key_watcher_.reset(new Watcher(this)); | |
| 415 | |
| 416 if (!key_watcher_.get()->StartWatching(key_, callback)) | |
| 417 return false; | |
| 418 | |
| 419 return true; | |
| 420 } | |
| 421 | |
| 422 // static | |
| 423 LONG RegKey::RegDeleteKeyExWrapper(HKEY hKey, | |
| 424 const wchar_t* lpSubKey, | |
| 425 REGSAM samDesired, | |
| 426 DWORD Reserved) { | |
| 427 typedef LSTATUS(WINAPI* RegDeleteKeyExPtr)(HKEY, LPCWSTR, REGSAM, DWORD); | |
| 428 | |
| 429 RegDeleteKeyExPtr reg_delete_key_ex_func = | |
| 430 reinterpret_cast<RegDeleteKeyExPtr>( | |
| 431 GetProcAddress(GetModuleHandleA("advapi32.dll"), "RegDeleteKeyExW")); | |
| 432 | |
| 433 if (reg_delete_key_ex_func) | |
| 434 return reg_delete_key_ex_func(hKey, lpSubKey, samDesired, Reserved); | |
| 435 | |
| 436 // Windows XP does not support RegDeleteKeyEx, so fallback to RegDeleteKey. | |
| 437 return RegDeleteKey(hKey, lpSubKey); | |
| 438 } | |
| 439 | |
| 440 // static | |
| 441 LONG RegKey::RegDelRecurse(HKEY root_key, | |
| 442 const std::wstring& name, | |
| 443 REGSAM access) { | |
| 444 // First, see if the key can be deleted without having to recurse. | |
| 445 LONG result = RegDeleteKeyExWrapper(root_key, name.c_str(), access, 0); | |
| 446 if (result == ERROR_SUCCESS) | |
| 447 return result; | |
| 448 | |
| 449 HKEY target_key = NULL; | |
| 450 result = RegOpenKeyEx( | |
| 451 root_key, name.c_str(), 0, KEY_ENUMERATE_SUB_KEYS | access, &target_key); | |
| 452 | |
| 453 if (result == ERROR_FILE_NOT_FOUND) | |
| 454 return ERROR_SUCCESS; | |
| 455 if (result != ERROR_SUCCESS) | |
| 456 return result; | |
| 457 | |
| 458 std::wstring subkey_name(name); | |
| 459 | |
| 460 // Check for an ending slash and add one if it is missing. | |
| 461 if (!name.empty() && subkey_name[name.length() - 1] != L'\\') | |
| 462 subkey_name += L"\\"; | |
| 463 | |
| 464 // Enumerate the keys | |
| 465 result = ERROR_SUCCESS; | |
| 466 const DWORD kMaxKeyNameLength = MAX_PATH; | |
| 467 const size_t base_key_length = subkey_name.length(); | |
| 468 std::wstring key_name; | |
| 469 while (result == ERROR_SUCCESS) { | |
| 470 DWORD key_size = kMaxKeyNameLength; | |
| 471 result = RegEnumKeyEx(target_key, | |
| 472 0, | |
| 473 WriteInto(&key_name, kMaxKeyNameLength), | |
| 474 &key_size, | |
| 475 NULL, | |
| 476 NULL, | |
| 477 NULL, | |
| 478 NULL); | |
| 479 | |
| 480 if (result != ERROR_SUCCESS) | |
| 481 break; | |
| 482 | |
| 483 key_name.resize(key_size); | |
| 484 subkey_name.resize(base_key_length); | |
| 485 subkey_name += key_name; | |
| 486 | |
| 487 if (RegDelRecurse(root_key, subkey_name, access) != ERROR_SUCCESS) | |
| 488 break; | |
| 489 } | |
| 490 | |
| 491 RegCloseKey(target_key); | |
| 492 | |
| 493 // Try again to delete the key. | |
| 494 result = RegDeleteKeyExWrapper(root_key, name.c_str(), access, 0); | |
| 495 | |
| 496 return result; | |
| 497 } | |
| 498 | |
| 499 // RegistryValueIterator ------------------------------------------------------ | |
| 500 | |
| 501 RegistryValueIterator::RegistryValueIterator(HKEY root_key, | |
| 502 const wchar_t* folder_key, | |
| 503 REGSAM wow64access) | |
| 504 : name_(MAX_PATH, L'\0'), | |
| 505 value_(MAX_PATH, L'\0') { | |
| 506 Initialize(root_key, folder_key, wow64access); | |
| 507 } | |
| 508 | |
| 509 RegistryValueIterator::RegistryValueIterator(HKEY root_key, | |
| 510 const wchar_t* folder_key) | |
| 511 : name_(MAX_PATH, L'\0'), | |
| 512 value_(MAX_PATH, L'\0') { | |
| 513 Initialize(root_key, folder_key, 0); | |
| 514 } | |
| 515 | |
| 516 void RegistryValueIterator::Initialize(HKEY root_key, | |
| 517 const wchar_t* folder_key, | |
| 518 REGSAM wow64access) { | |
| 519 DCHECK_EQ(wow64access & ~kWow64AccessMask, static_cast<REGSAM>(0)); | |
| 520 LONG result = | |
| 521 RegOpenKeyEx(root_key, folder_key, 0, KEY_READ | wow64access, &key_); | |
| 522 if (result != ERROR_SUCCESS) { | |
| 523 key_ = NULL; | |
| 524 } else { | |
| 525 DWORD count = 0; | |
| 526 result = ::RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL, NULL, &count, | |
| 527 NULL, NULL, NULL, NULL); | |
| 528 | |
| 529 if (result != ERROR_SUCCESS) { | |
| 530 ::RegCloseKey(key_); | |
| 531 key_ = NULL; | |
| 532 } else { | |
| 533 index_ = count - 1; | |
| 534 } | |
| 535 } | |
| 536 | |
| 537 Read(); | |
| 538 } | |
| 539 | |
| 540 RegistryValueIterator::~RegistryValueIterator() { | |
| 541 if (key_) | |
| 542 ::RegCloseKey(key_); | |
| 543 } | |
| 544 | |
| 545 DWORD RegistryValueIterator::ValueCount() const { | |
| 546 DWORD count = 0; | |
| 547 LONG result = ::RegQueryInfoKey(key_, NULL, 0, NULL, NULL, NULL, NULL, | |
| 548 &count, NULL, NULL, NULL, NULL); | |
| 549 if (result != ERROR_SUCCESS) | |
| 550 return 0; | |
| 551 | |
| 552 return count; | |
| 553 } | |
| 554 | |
| 555 bool RegistryValueIterator::Valid() const { | |
| 556 return key_ != NULL && index_ >= 0; | |
| 557 } | |
| 558 | |
| 559 void RegistryValueIterator::operator++() { | |
| 560 --index_; | |
| 561 Read(); | |
| 562 } | |
| 563 | |
| 564 bool RegistryValueIterator::Read() { | |
| 565 if (Valid()) { | |
| 566 DWORD capacity = static_cast<DWORD>(name_.capacity()); | |
| 567 DWORD name_size = capacity; | |
| 568 // |value_size_| is in bytes. Reserve the last character for a NUL. | |
| 569 value_size_ = static_cast<DWORD>((value_.size() - 1) * sizeof(wchar_t)); | |
| 570 LONG result = ::RegEnumValue( | |
| 571 key_, index_, WriteInto(&name_, name_size), &name_size, NULL, &type_, | |
| 572 reinterpret_cast<BYTE*>(vector_as_array(&value_)), &value_size_); | |
| 573 | |
| 574 if (result == ERROR_MORE_DATA) { | |
| 575 // Registry key names are limited to 255 characters and fit within | |
| 576 // MAX_PATH (which is 260) but registry value names can use up to 16,383 | |
| 577 // characters and the value itself is not limited | |
| 578 // (from http://msdn.microsoft.com/en-us/library/windows/desktop/ | |
| 579 // ms724872(v=vs.85).aspx). | |
| 580 // Resize the buffers and retry if their size caused the failure. | |
| 581 DWORD value_size_in_wchars = to_wchar_size(value_size_); | |
| 582 if (value_size_in_wchars + 1 > value_.size()) | |
| 583 value_.resize(value_size_in_wchars + 1, L'\0'); | |
| 584 value_size_ = static_cast<DWORD>((value_.size() - 1) * sizeof(wchar_t)); | |
| 585 name_size = name_size == capacity ? MAX_REGISTRY_NAME_SIZE : capacity; | |
| 586 result = ::RegEnumValue( | |
| 587 key_, index_, WriteInto(&name_, name_size), &name_size, NULL, &type_, | |
| 588 reinterpret_cast<BYTE*>(vector_as_array(&value_)), &value_size_); | |
| 589 } | |
| 590 | |
| 591 if (result == ERROR_SUCCESS) { | |
| 592 DCHECK_LT(to_wchar_size(value_size_), value_.size()); | |
| 593 value_[to_wchar_size(value_size_)] = L'\0'; | |
| 594 return true; | |
| 595 } | |
| 596 } | |
| 597 | |
| 598 name_[0] = L'\0'; | |
| 599 value_[0] = L'\0'; | |
| 600 value_size_ = 0; | |
| 601 return false; | |
| 602 } | |
| 603 | |
| 604 // RegistryKeyIterator -------------------------------------------------------- | |
| 605 | |
| 606 RegistryKeyIterator::RegistryKeyIterator(HKEY root_key, | |
| 607 const wchar_t* folder_key) { | |
| 608 Initialize(root_key, folder_key, 0); | |
| 609 } | |
| 610 | |
| 611 RegistryKeyIterator::RegistryKeyIterator(HKEY root_key, | |
| 612 const wchar_t* folder_key, | |
| 613 REGSAM wow64access) { | |
| 614 Initialize(root_key, folder_key, wow64access); | |
| 615 } | |
| 616 | |
| 617 RegistryKeyIterator::~RegistryKeyIterator() { | |
| 618 if (key_) | |
| 619 ::RegCloseKey(key_); | |
| 620 } | |
| 621 | |
| 622 DWORD RegistryKeyIterator::SubkeyCount() const { | |
| 623 DWORD count = 0; | |
| 624 LONG result = ::RegQueryInfoKey(key_, NULL, 0, NULL, &count, NULL, NULL, | |
| 625 NULL, NULL, NULL, NULL, NULL); | |
| 626 if (result != ERROR_SUCCESS) | |
| 627 return 0; | |
| 628 | |
| 629 return count; | |
| 630 } | |
| 631 | |
| 632 bool RegistryKeyIterator::Valid() const { | |
| 633 return key_ != NULL && index_ >= 0; | |
| 634 } | |
| 635 | |
| 636 void RegistryKeyIterator::operator++() { | |
| 637 --index_; | |
| 638 Read(); | |
| 639 } | |
| 640 | |
| 641 bool RegistryKeyIterator::Read() { | |
| 642 if (Valid()) { | |
| 643 DWORD ncount = arraysize(name_); | |
| 644 FILETIME written; | |
| 645 LONG r = ::RegEnumKeyEx(key_, index_, name_, &ncount, NULL, NULL, | |
| 646 NULL, &written); | |
| 647 if (ERROR_SUCCESS == r) | |
| 648 return true; | |
| 649 } | |
| 650 | |
| 651 name_[0] = '\0'; | |
| 652 return false; | |
| 653 } | |
| 654 | |
| 655 void RegistryKeyIterator::Initialize(HKEY root_key, | |
| 656 const wchar_t* folder_key, | |
| 657 REGSAM wow64access) { | |
| 658 DCHECK_EQ(wow64access & ~kWow64AccessMask, static_cast<REGSAM>(0)); | |
| 659 LONG result = | |
| 660 RegOpenKeyEx(root_key, folder_key, 0, KEY_READ | wow64access, &key_); | |
| 661 if (result != ERROR_SUCCESS) { | |
| 662 key_ = NULL; | |
| 663 } else { | |
| 664 DWORD count = 0; | |
| 665 result = ::RegQueryInfoKey(key_, NULL, 0, NULL, &count, NULL, NULL, NULL, | |
| 666 NULL, NULL, NULL, NULL); | |
| 667 | |
| 668 if (result != ERROR_SUCCESS) { | |
| 669 ::RegCloseKey(key_); | |
| 670 key_ = NULL; | |
| 671 } else { | |
| 672 index_ = count - 1; | |
| 673 } | |
| 674 } | |
| 675 | |
| 676 Read(); | |
| 677 } | |
| 678 | |
| 679 } // namespace win | |
| 680 } // namespace base | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1446363003:
Deleted OS_WIN and all Windows specific files from base. (Closed)
Base URL: https://github.com/domokit/mojo.git@base_tests