1 /* 2 ******************************************************************************** 3 * Copyright (C) 2005-2015, International Business Machines 4 * Corporation and others. All Rights Reserved. 5 ******************************************************************************** 6 * 7 * File WINTZ.CPP 8 * 9 ******************************************************************************** 10 */ 11 12 #include "unicode/utypes.h" 13 14 #if U_PLATFORM_HAS_WIN32_API 15 16 #include "wintz.h" 17 #include "cmemory.h" 18 #include "cstring.h" 19 20 #include "unicode/ures.h" 21 #include "unicode/ustring.h" 22 23 # define WIN32_LEAN_AND_MEAN 24 # define VC_EXTRALEAN 25 # define NOUSER 26 # define NOSERVICE 27 # define NOIME 28 # define NOMCX 29 #include <windows.h> 30 31 #define MAX_LENGTH_ID 40 32 33 /* The layout of the Tzi value in the registry */ 34 typedef struct 35 { 36 int32_t bias; 37 int32_t standardBias; 38 int32_t daylightBias; 39 SYSTEMTIME standardDate; 40 SYSTEMTIME daylightDate; 41 } TZI; 42 43 /** 44 * Various registry keys and key fragments. 45 */ 46 static const char CURRENT_ZONE_REGKEY[] = "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\"; 47 /* static const char STANDARD_NAME_REGKEY[] = "StandardName"; Currently unused constant */ 48 static const char STANDARD_TIME_REGKEY[] = " Standard Time"; 49 static const char TZI_REGKEY[] = "TZI"; 50 static const char STD_REGKEY[] = "Std"; 51 52 /** 53 * HKLM subkeys used to probe for the flavor of Windows. Note that we 54 * specifically check for the "GMT" zone subkey; this is present on 55 * NT, but on XP has become "GMT Standard Time". We need to 56 * discriminate between these cases. 57 */ 58 static const char* const WIN_TYPE_PROBE_REGKEY[] = { 59 /* WIN_9X_ME_TYPE */ 60 "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones", 61 62 /* WIN_NT_TYPE */ 63 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\GMT" 64 65 /* otherwise: WIN_2K_XP_TYPE */ 66 }; 67 68 /** 69 * The time zone root subkeys (under HKLM) for different flavors of 70 * Windows. 71 */ 72 static const char* const TZ_REGKEY[] = { 73 /* WIN_9X_ME_TYPE */ 74 "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones\\", 75 76 /* WIN_NT_TYPE | WIN_2K_XP_TYPE */ 77 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\" 78 }; 79 80 /** 81 * Flavor of Windows, from our perspective. Not a real OS version, 82 * but rather the flavor of the layout of the time zone information in 83 * the registry. 84 */ 85 enum { 86 WIN_9X_ME_TYPE = 1, 87 WIN_NT_TYPE = 2, 88 WIN_2K_XP_TYPE = 3 89 }; 90 91 static int32_t gWinType = 0; 92 93 static int32_t detectWindowsType() 94 { 95 int32_t winType; 96 LONG result; 97 HKEY hkey; 98 99 /* Detect the version of windows by trying to open a sequence of 100 probe keys. We don't use the OS version API because what we 101 really want to know is how the registry is laid out. 102 Specifically, is it 9x/Me or not, and is it "GMT" or "GMT 103 Standard Time". */ 104 for (winType = 0; winType < 2; winType++) { 105 result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, 106 WIN_TYPE_PROBE_REGKEY[winType], 107 0, 108 KEY_QUERY_VALUE, 109 &hkey); 110 RegCloseKey(hkey); 111 112 if (result == ERROR_SUCCESS) { 113 break; 114 } 115 } 116 117 return winType+1; /* +1 to bring it inline with the enum */ 118 } 119 120 static LONG openTZRegKey(HKEY *hkey, const char *winid) 121 { 122 char subKeyName[110]; /* TODO: why 96?? */ 123 char *name; 124 LONG result; 125 126 /* This isn't thread safe, but it's good enough because the result should be constant per system. */ 127 if (gWinType <= 0) { 128 gWinType = detectWindowsType(); 129 } 130 131 uprv_strcpy(subKeyName, TZ_REGKEY[(gWinType != WIN_9X_ME_TYPE)]); 132 name = &subKeyName[strlen(subKeyName)]; 133 uprv_strcat(subKeyName, winid); 134 135 if (gWinType == WIN_9X_ME_TYPE) { 136 /* Remove " Standard Time" */ 137 char *pStd = uprv_strstr(subKeyName, STANDARD_TIME_REGKEY); 138 if (pStd) { 139 *pStd = 0; 140 } 141 } 142 143 result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, 144 subKeyName, 145 0, 146 KEY_QUERY_VALUE, 147 hkey); 148 return result; 149 } 150 151 static LONG getTZI(const char *winid, TZI *tzi) 152 { 153 DWORD cbData = sizeof(TZI); 154 LONG result; 155 HKEY hkey; 156 157 result = openTZRegKey(&hkey, winid); 158 159 if (result == ERROR_SUCCESS) { 160 result = RegQueryValueExA(hkey, 161 TZI_REGKEY, 162 NULL, 163 NULL, 164 (LPBYTE)tzi, 165 &cbData); 166 167 } 168 169 RegCloseKey(hkey); 170 171 return result; 172 } 173 174 static LONG getSTDName(const char *winid, char *regStdName, int32_t length) { 175 DWORD cbData = length; 176 LONG result; 177 HKEY hkey; 178 179 result = openTZRegKey(&hkey, winid); 180 181 if (result == ERROR_SUCCESS) { 182 result = RegQueryValueExA(hkey, 183 STD_REGKEY, 184 NULL, 185 NULL, 186 (LPBYTE)regStdName, 187 &cbData); 188 189 } 190 191 RegCloseKey(hkey); 192 193 return result; 194 } 195 196 static LONG getTZKeyName(char* tzKeyName, int32_t length) { 197 HKEY hkey; 198 LONG result = FALSE; 199 DWORD cbData = length; 200 201 if(ERROR_SUCCESS == RegOpenKeyExA( 202 HKEY_LOCAL_MACHINE, 203 CURRENT_ZONE_REGKEY, 204 0, 205 KEY_QUERY_VALUE, 206 &hkey)) 207 { 208 result = RegQueryValueExA( 209 hkey, 210 "TimeZoneKeyName", 211 NULL, 212 NULL, 213 (LPBYTE)tzKeyName, 214 &cbData); 215 } 216 217 return result; 218 } 219 220 /* 221 This code attempts to detect the Windows time zone, as set in the 222 Windows Date and Time control panel. It attempts to work on 223 multiple flavors of Windows (9x, Me, NT, 2000, XP) and on localized 224 installs. It works by directly interrogating the registry and 225 comparing the data there with the data returned by the 226 GetTimeZoneInformation API, along with some other strategies. The 227 registry contains time zone data under one of two keys (depending on 228 the flavor of Windows): 229 230 HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones\ 231 HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\ 232 233 Under this key are several subkeys, one for each time zone. These 234 subkeys are named "Pacific" on Win9x/Me and "Pacific Standard Time" 235 on WinNT/2k/XP. There are some other wrinkles; see the code for 236 details. The subkey name is NOT LOCALIZED, allowing us to support 237 localized installs. 238 239 Under the subkey are data values. We care about: 240 241 Std Standard time display name, localized 242 TZI Binary block of data 243 244 The TZI data is of particular interest. It contains the offset, two 245 more offsets for standard and daylight time, and the start and end 246 rules. This is the same data returned by the GetTimeZoneInformation 247 API. The API may modify the data on the way out, so we have to be 248 careful, but essentially we do a binary comparison against the TZI 249 blocks of various registry keys. When we find a match, we know what 250 time zone Windows is set to. Since the registry key is not 251 localized, we can then translate the key through a simple table 252 lookup into the corresponding ICU time zone. 253 254 This strategy doesn't always work because there are zones which 255 share an offset and rules, so more than one TZI block will match. 256 For example, both Tokyo and Seoul are at GMT+9 with no DST rules; 257 their TZI blocks are identical. For these cases, we fall back to a 258 name lookup. We attempt to match the display name as stored in the 259 registry for the current zone to the display name stored in the 260 registry for various Windows zones. By comparing the registry data 261 directly we avoid conversion complications. 262 263 Author: Alan Liu 264 Since: ICU 2.6 265 Based on original code by Carl Brown <cbrown (at) xnetinc.com> 266 */ 267 268 /** 269 * Main Windows time zone detection function. Returns the Windows 270 * time zone, translated to an ICU time zone, or NULL upon failure. 271 */ 272 U_CFUNC const char* U_EXPORT2 273 uprv_detectWindowsTimeZone() { 274 UErrorCode status = U_ZERO_ERROR; 275 UResourceBundle* bundle = NULL; 276 char* icuid = NULL; 277 char apiStdName[MAX_LENGTH_ID]; 278 char regStdName[MAX_LENGTH_ID]; 279 char tmpid[MAX_LENGTH_ID]; 280 int32_t len; 281 int id; 282 int errorCode; 283 UChar ISOcodeW[3]; /* 2 letter iso code in UTF-16*/ 284 char ISOcodeA[3]; /* 2 letter iso code in ansi */ 285 286 LONG result; 287 TZI tziKey; 288 TZI tziReg; 289 TIME_ZONE_INFORMATION apiTZI; 290 291 BOOL isVistaOrHigher; 292 BOOL tryPreVistaFallback; 293 OSVERSIONINFO osVerInfo; 294 295 /* Obtain TIME_ZONE_INFORMATION from the API, and then convert it 296 to TZI. We could also interrogate the registry directly; we do 297 this below if needed. */ 298 uprv_memset(&apiTZI, 0, sizeof(apiTZI)); 299 uprv_memset(&tziKey, 0, sizeof(tziKey)); 300 uprv_memset(&tziReg, 0, sizeof(tziReg)); 301 GetTimeZoneInformation(&apiTZI); 302 tziKey.bias = apiTZI.Bias; 303 uprv_memcpy((char *)&tziKey.standardDate, (char*)&apiTZI.StandardDate, 304 sizeof(apiTZI.StandardDate)); 305 uprv_memcpy((char *)&tziKey.daylightDate, (char*)&apiTZI.DaylightDate, 306 sizeof(apiTZI.DaylightDate)); 307 308 /* Convert the wchar_t* standard name to char* */ 309 uprv_memset(apiStdName, 0, sizeof(apiStdName)); 310 wcstombs(apiStdName, apiTZI.StandardName, MAX_LENGTH_ID); 311 312 tmpid[0] = 0; 313 314 id = GetUserGeoID(GEOCLASS_NATION); 315 errorCode = GetGeoInfoW(id,GEO_ISO2,ISOcodeW,3,0); 316 u_strToUTF8(ISOcodeA, 3, NULL, ISOcodeW, 3, &status); 317 318 bundle = ures_openDirect(NULL, "windowsZones", &status); 319 ures_getByKey(bundle, "mapTimezones", bundle, &status); 320 321 /* 322 Windows Vista+ provides us with a "TimeZoneKeyName" that is not localized 323 and can be used to directly map a name in our bundle. Try to use that first 324 if we're on Vista or higher 325 */ 326 uprv_memset(&osVerInfo, 0, sizeof(osVerInfo)); 327 osVerInfo.dwOSVersionInfoSize = sizeof(osVerInfo); 328 GetVersionEx(&osVerInfo); 329 isVistaOrHigher = osVerInfo.dwMajorVersion >= 6; /* actually includes Windows Server 2008 as well, but don't worry about it */ 330 tryPreVistaFallback = TRUE; 331 if(isVistaOrHigher) { 332 result = getTZKeyName(regStdName, sizeof(regStdName)); 333 if(ERROR_SUCCESS == result) { 334 UResourceBundle* winTZ = ures_getByKey(bundle, regStdName, NULL, &status); 335 if(U_SUCCESS(status)) { 336 const UChar* icuTZ = NULL; 337 if (errorCode != 0) { 338 icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status); 339 } 340 if (errorCode==0 || icuTZ==NULL) { 341 /* fallback to default "001" and reset status */ 342 status = U_ZERO_ERROR; 343 icuTZ = ures_getStringByKey(winTZ, "001", &len, &status); 344 } 345 346 if(U_SUCCESS(status)) { 347 int index=0; 348 while (! (*icuTZ == '\0' || *icuTZ ==' ')) { 349 tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */ 350 } 351 tmpid[index]='\0'; 352 tryPreVistaFallback = FALSE; 353 } 354 } 355 } 356 } 357 358 if(tryPreVistaFallback) { 359 360 /* Note: We get the winid not from static tables but from resource bundle. */ 361 while (U_SUCCESS(status) && ures_hasNext(bundle)) { 362 UBool idFound = FALSE; 363 const char* winid; 364 UResourceBundle* winTZ = ures_getNextResource(bundle, NULL, &status); 365 if (U_FAILURE(status)) { 366 break; 367 } 368 winid = ures_getKey(winTZ); 369 result = getTZI(winid, &tziReg); 370 371 if (result == ERROR_SUCCESS) { 372 /* Windows alters the DaylightBias in some situations. 373 Using the bias and the rules suffices, so overwrite 374 these unreliable fields. */ 375 tziKey.standardBias = tziReg.standardBias; 376 tziKey.daylightBias = tziReg.daylightBias; 377 378 if (uprv_memcmp((char *)&tziKey, (char*)&tziReg, sizeof(tziKey)) == 0) { 379 const UChar* icuTZ = NULL; 380 if (errorCode != 0) { 381 icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status); 382 } 383 if (errorCode==0 || icuTZ==NULL) { 384 /* fallback to default "001" and reset status */ 385 status = U_ZERO_ERROR; 386 icuTZ = ures_getStringByKey(winTZ, "001", &len, &status); 387 } 388 389 if (U_SUCCESS(status)) { 390 /* Get the standard name from the registry key to compare with 391 the one from Windows API call. */ 392 uprv_memset(regStdName, 0, sizeof(regStdName)); 393 result = getSTDName(winid, regStdName, sizeof(regStdName)); 394 if (result == ERROR_SUCCESS) { 395 if (uprv_strcmp(apiStdName, regStdName) == 0) { 396 idFound = TRUE; 397 } 398 } 399 400 /* tmpid buffer holds the ICU timezone ID corresponding to the timezone ID from Windows. 401 * If none is found, tmpid buffer will contain a fallback ID (i.e. the time zone ID matching 402 * the current time zone information) 403 */ 404 if (idFound || tmpid[0] == 0) { 405 /* if icuTZ has more than one city, take only the first (i.e. terminate icuTZ at first space) */ 406 int index=0; 407 while (! (*icuTZ == '\0' || *icuTZ ==' ')) { 408 tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */ 409 } 410 tmpid[index]='\0'; 411 } 412 } 413 } 414 } 415 ures_close(winTZ); 416 if (idFound) { 417 break; 418 } 419 } 420 } 421 422 /* 423 * Copy the timezone ID to icuid to be returned. 424 */ 425 if (tmpid[0] != 0) { 426 len = uprv_strlen(tmpid); 427 icuid = (char*)uprv_calloc(len + 1, sizeof(char)); 428 if (icuid != NULL) { 429 uprv_strcpy(icuid, tmpid); 430 } 431 } 432 433 ures_close(bundle); 434 435 return icuid; 436 } 437 438 #endif /* U_PLATFORM_HAS_WIN32_API */ 439
