1 /* 2 ******************************************************************************** 3 * Copyright (C) 2005-2010, 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 #ifdef U_WINDOWS 15 16 #include "wintz.h" 17 18 #include "cmemory.h" 19 #include "cstring.h" 20 21 #include "unicode/ustring.h" 22 #include "unicode/ures.h" 23 24 # define WIN32_LEAN_AND_MEAN 25 # define VC_EXTRALEAN 26 # define NOUSER 27 # define NOSERVICE 28 # define NOIME 29 # define NOMCX 30 #include <windows.h> 31 32 /* The layout of the Tzi value in the registry */ 33 typedef struct 34 { 35 int32_t bias; 36 int32_t standardBias; 37 int32_t daylightBias; 38 SYSTEMTIME standardDate; 39 SYSTEMTIME daylightDate; 40 } TZI; 41 42 /** 43 * Various registry keys and key fragments. 44 */ 45 static const char CURRENT_ZONE_REGKEY[] = "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\"; 46 static const char STANDARD_NAME_REGKEY[] = "StandardName"; 47 static const char STANDARD_TIME_REGKEY[] = " Standard Time"; 48 static const char TZI_REGKEY[] = "TZI"; 49 static const char STD_REGKEY[] = "Std"; 50 51 /** 52 * HKLM subkeys used to probe for the flavor of Windows. Note that we 53 * specifically check for the "GMT" zone subkey; this is present on 54 * NT, but on XP has become "GMT Standard Time". We need to 55 * discriminate between these cases. 56 */ 57 static const char* const WIN_TYPE_PROBE_REGKEY[] = { 58 /* WIN_9X_ME_TYPE */ 59 "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones", 60 61 /* WIN_NT_TYPE */ 62 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\GMT" 63 64 /* otherwise: WIN_2K_XP_TYPE */ 65 }; 66 67 /** 68 * The time zone root subkeys (under HKLM) for different flavors of 69 * Windows. 70 */ 71 static const char* const TZ_REGKEY[] = { 72 /* WIN_9X_ME_TYPE */ 73 "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones\\", 74 75 /* WIN_NT_TYPE | WIN_2K_XP_TYPE */ 76 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\" 77 }; 78 79 /** 80 * Flavor of Windows, from our perspective. Not a real OS version, 81 * but rather the flavor of the layout of the time zone information in 82 * the registry. 83 */ 84 enum { 85 WIN_9X_ME_TYPE = 1, 86 WIN_NT_TYPE = 2, 87 WIN_2K_XP_TYPE = 3 88 }; 89 90 static int32_t gWinType = 0; 91 92 static int32_t detectWindowsType() 93 { 94 int32_t winType; 95 LONG result; 96 HKEY hkey; 97 98 /* Detect the version of windows by trying to open a sequence of 99 probe keys. We don't use the OS version API because what we 100 really want to know is how the registry is laid out. 101 Specifically, is it 9x/Me or not, and is it "GMT" or "GMT 102 Standard Time". */ 103 for (winType = 0; winType < 2; winType++) { 104 result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, 105 WIN_TYPE_PROBE_REGKEY[winType], 106 0, 107 KEY_QUERY_VALUE, 108 &hkey); 109 RegCloseKey(hkey); 110 111 if (result == ERROR_SUCCESS) { 112 break; 113 } 114 } 115 116 return winType+1; // +1 to bring it inline with the enum 117 } 118 119 static LONG openTZRegKey(HKEY *hkey, const char *winid) 120 { 121 char subKeyName[110]; /* TODO: why 96?? */ 122 char *name; 123 LONG result; 124 125 /* This isn't thread safe, but it's good enough because the result should be constant per system. */ 126 if (gWinType <= 0) { 127 gWinType = detectWindowsType(); 128 } 129 130 uprv_strcpy(subKeyName, TZ_REGKEY[(gWinType != WIN_9X_ME_TYPE)]); 131 name = &subKeyName[strlen(subKeyName)]; 132 uprv_strcat(subKeyName, winid); 133 134 if (gWinType == WIN_9X_ME_TYPE) { 135 /* Remove " Standard Time" */ 136 char *pStd = uprv_strstr(subKeyName, STANDARD_TIME_REGKEY); 137 if (pStd) { 138 *pStd = 0; 139 } 140 } 141 142 result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, 143 subKeyName, 144 0, 145 KEY_QUERY_VALUE, 146 hkey); 147 return result; 148 } 149 150 static LONG getTZI(const char *winid, TZI *tzi) 151 { 152 DWORD cbData = sizeof(TZI); 153 LONG result; 154 HKEY hkey; 155 156 result = openTZRegKey(&hkey, winid); 157 158 if (result == ERROR_SUCCESS) { 159 result = RegQueryValueExA(hkey, 160 TZI_REGKEY, 161 NULL, 162 NULL, 163 (LPBYTE)tzi, 164 &cbData); 165 166 } 167 168 RegCloseKey(hkey); 169 170 return result; 171 } 172 173 /* 174 This code attempts to detect the Windows time zone, as set in the 175 Windows Date and Time control panel. It attempts to work on 176 multiple flavors of Windows (9x, Me, NT, 2000, XP) and on localized 177 installs. It works by directly interrogating the registry and 178 comparing the data there with the data returned by the 179 GetTimeZoneInformation API, along with some other strategies. The 180 registry contains time zone data under one of two keys (depending on 181 the flavor of Windows): 182 183 HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones\ 184 HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\ 185 186 Under this key are several subkeys, one for each time zone. These 187 subkeys are named "Pacific" on Win9x/Me and "Pacific Standard Time" 188 on WinNT/2k/XP. There are some other wrinkles; see the code for 189 details. The subkey name is NOT LOCALIZED, allowing us to support 190 localized installs. 191 192 Under the subkey are data values. We care about: 193 194 Std Standard time display name, localized 195 TZI Binary block of data 196 197 The TZI data is of particular interest. It contains the offset, two 198 more offsets for standard and daylight time, and the start and end 199 rules. This is the same data returned by the GetTimeZoneInformation 200 API. The API may modify the data on the way out, so we have to be 201 careful, but essentially we do a binary comparison against the TZI 202 blocks of various registry keys. When we find a match, we know what 203 time zone Windows is set to. Since the registry key is not 204 localized, we can then translate the key through a simple table 205 lookup into the corresponding ICU time zone. 206 207 This strategy doesn't always work because there are zones which 208 share an offset and rules, so more than one TZI block will match. 209 For example, both Tokyo and Seoul are at GMT+9 with no DST rules; 210 their TZI blocks are identical. For these cases, we fall back to a 211 name lookup. We attempt to match the display name as stored in the 212 registry for the current zone to the display name stored in the 213 registry for various Windows zones. By comparing the registry data 214 directly we avoid conversion complications. 215 216 Author: Alan Liu 217 Since: ICU 2.6 218 Based on original code by Carl Brown <cbrown (at) xnetinc.com> 219 */ 220 221 /** 222 * Main Windows time zone detection function. Returns the Windows 223 * time zone, translated to an ICU time zone, or NULL upon failure. 224 */ 225 U_CFUNC const char* U_EXPORT2 226 uprv_detectWindowsTimeZone() { 227 UErrorCode status = U_ZERO_ERROR; 228 UResourceBundle* bundle = NULL; 229 char* icuid = NULL; 230 231 LONG result; 232 TZI tziKey; 233 TZI tziReg; 234 TIME_ZONE_INFORMATION apiTZI; 235 236 /* Obtain TIME_ZONE_INFORMATION from the API, and then convert it 237 to TZI. We could also interrogate the registry directly; we do 238 this below if needed. */ 239 uprv_memset(&apiTZI, 0, sizeof(apiTZI)); 240 uprv_memset(&tziKey, 0, sizeof(tziKey)); 241 uprv_memset(&tziReg, 0, sizeof(tziReg)); 242 GetTimeZoneInformation(&apiTZI); 243 tziKey.bias = apiTZI.Bias; 244 uprv_memcpy((char *)&tziKey.standardDate, (char*)&apiTZI.StandardDate, 245 sizeof(apiTZI.StandardDate)); 246 uprv_memcpy((char *)&tziKey.daylightDate, (char*)&apiTZI.DaylightDate, 247 sizeof(apiTZI.DaylightDate)); 248 249 bundle = ures_openDirect(NULL, "windowsZones", &status); 250 ures_getByKey(bundle, "mapTimezones", bundle, &status); 251 252 /* Note: We get the winid not from static tables but from resource bundle. */ 253 while (U_SUCCESS(status) && ures_hasNext(bundle)) { 254 const char* winid; 255 int32_t len; 256 UResourceBundle* winTZ = ures_getNextResource(bundle, NULL, &status); 257 if (U_FAILURE(status)) { 258 break; 259 } 260 winid = ures_getKey(winTZ); 261 result = getTZI(winid, &tziReg); 262 263 if (result == ERROR_SUCCESS) { 264 /* Windows alters the DaylightBias in some situations. 265 Using the bias and the rules suffices, so overwrite 266 these unreliable fields. */ 267 tziKey.standardBias = tziReg.standardBias; 268 tziKey.daylightBias = tziReg.daylightBias; 269 270 if (uprv_memcmp((char *)&tziKey, (char*)&tziReg, sizeof(tziKey)) == 0) { 271 const UChar* icuTZ = ures_getStringByKey(winTZ, "001", &len, &status); 272 if (U_SUCCESS(status)) { 273 icuid = (char*)uprv_malloc(sizeof(char) * (len + 1)); 274 uprv_memset(icuid, 0, len + 1); 275 u_austrncpy(icuid, icuTZ, len); 276 } 277 } 278 } 279 ures_close(winTZ); 280 if (icuid != NULL) { 281 break; 282 } 283 } 284 285 ures_close(bundle); 286 287 return icuid; 288 } 289 290 #endif /* #ifdef U_WINDOWS */ 291
