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Diffstat (limited to 'intl/icu/source/common/wintz.c')
| -rw-r--r-- | intl/icu/source/common/wintz.c | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/intl/icu/source/common/wintz.c b/intl/icu/source/common/wintz.c new file mode 100644 index 000000000..a8696af39 --- /dev/null +++ b/intl/icu/source/common/wintz.c @@ -0,0 +1,441 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************** +* Copyright (C) 2005-2015, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************** +* +* File WINTZ.CPP +* +******************************************************************************** +*/ + +#include "unicode/utypes.h" + +#if U_PLATFORM_HAS_WIN32_API + +#include "wintz.h" +#include "cmemory.h" +#include "cstring.h" + +#include "unicode/ures.h" +#include "unicode/ustring.h" + +# define WIN32_LEAN_AND_MEAN +# define VC_EXTRALEAN +# define NOUSER +# define NOSERVICE +# define NOIME +# define NOMCX +#include <windows.h> + +#define MAX_LENGTH_ID 40 + +/* The layout of the Tzi value in the registry */ +typedef struct +{ + int32_t bias; + int32_t standardBias; + int32_t daylightBias; + SYSTEMTIME standardDate; + SYSTEMTIME daylightDate; +} TZI; + +/** + * Various registry keys and key fragments. + */ +static const char CURRENT_ZONE_REGKEY[] = "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\"; +/* static const char STANDARD_NAME_REGKEY[] = "StandardName"; Currently unused constant */ +static const char STANDARD_TIME_REGKEY[] = " Standard Time"; +static const char TZI_REGKEY[] = "TZI"; +static const char STD_REGKEY[] = "Std"; + +/** + * HKLM subkeys used to probe for the flavor of Windows. Note that we + * specifically check for the "GMT" zone subkey; this is present on + * NT, but on XP has become "GMT Standard Time". We need to + * discriminate between these cases. + */ +static const char* const WIN_TYPE_PROBE_REGKEY[] = { + /* WIN_9X_ME_TYPE */ + "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones", + + /* WIN_NT_TYPE */ + "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\GMT" + + /* otherwise: WIN_2K_XP_TYPE */ +}; + +/** + * The time zone root subkeys (under HKLM) for different flavors of + * Windows. + */ +static const char* const TZ_REGKEY[] = { + /* WIN_9X_ME_TYPE */ + "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones\\", + + /* WIN_NT_TYPE | WIN_2K_XP_TYPE */ + "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\" +}; + +/** + * Flavor of Windows, from our perspective. Not a real OS version, + * but rather the flavor of the layout of the time zone information in + * the registry. + */ +enum { + WIN_9X_ME_TYPE = 1, + WIN_NT_TYPE = 2, + WIN_2K_XP_TYPE = 3 +}; + +static int32_t gWinType = 0; + +static int32_t detectWindowsType() +{ + int32_t winType; + LONG result; + HKEY hkey; + + /* Detect the version of windows by trying to open a sequence of + probe keys. We don't use the OS version API because what we + really want to know is how the registry is laid out. + Specifically, is it 9x/Me or not, and is it "GMT" or "GMT + Standard Time". */ + for (winType = 0; winType < 2; winType++) { + result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, + WIN_TYPE_PROBE_REGKEY[winType], + 0, + KEY_QUERY_VALUE, + &hkey); + RegCloseKey(hkey); + + if (result == ERROR_SUCCESS) { + break; + } + } + + return winType+1; /* +1 to bring it inline with the enum */ +} + +static LONG openTZRegKey(HKEY *hkey, const char *winid) +{ + char subKeyName[110]; /* TODO: why 96?? */ + char *name; + LONG result; + + /* This isn't thread safe, but it's good enough because the result should be constant per system. */ + if (gWinType <= 0) { + gWinType = detectWindowsType(); + } + + uprv_strcpy(subKeyName, TZ_REGKEY[(gWinType != WIN_9X_ME_TYPE)]); + name = &subKeyName[strlen(subKeyName)]; + uprv_strcat(subKeyName, winid); + + if (gWinType == WIN_9X_ME_TYPE) { + /* Remove " Standard Time" */ + char *pStd = uprv_strstr(subKeyName, STANDARD_TIME_REGKEY); + if (pStd) { + *pStd = 0; + } + } + + result = RegOpenKeyExA(HKEY_LOCAL_MACHINE, + subKeyName, + 0, + KEY_QUERY_VALUE, + hkey); + return result; +} + +static LONG getTZI(const char *winid, TZI *tzi) +{ + DWORD cbData = sizeof(TZI); + LONG result; + HKEY hkey; + + result = openTZRegKey(&hkey, winid); + + if (result == ERROR_SUCCESS) { + result = RegQueryValueExA(hkey, + TZI_REGKEY, + NULL, + NULL, + (LPBYTE)tzi, + &cbData); + + } + + RegCloseKey(hkey); + + return result; +} + +static LONG getSTDName(const char *winid, char *regStdName, int32_t length) { + DWORD cbData = length; + LONG result; + HKEY hkey; + + result = openTZRegKey(&hkey, winid); + + if (result == ERROR_SUCCESS) { + result = RegQueryValueExA(hkey, + STD_REGKEY, + NULL, + NULL, + (LPBYTE)regStdName, + &cbData); + + } + + RegCloseKey(hkey); + + return result; +} + +static LONG getTZKeyName(char* tzKeyName, int32_t length) { + HKEY hkey; + LONG result = FALSE; + DWORD cbData = length; + + if(ERROR_SUCCESS == RegOpenKeyExA( + HKEY_LOCAL_MACHINE, + CURRENT_ZONE_REGKEY, + 0, + KEY_QUERY_VALUE, + &hkey)) + { + result = RegQueryValueExA( + hkey, + "TimeZoneKeyName", + NULL, + NULL, + (LPBYTE)tzKeyName, + &cbData); + } + + return result; +} + +/* + This code attempts to detect the Windows time zone, as set in the + Windows Date and Time control panel. It attempts to work on + multiple flavors of Windows (9x, Me, NT, 2000, XP) and on localized + installs. It works by directly interrogating the registry and + comparing the data there with the data returned by the + GetTimeZoneInformation API, along with some other strategies. The + registry contains time zone data under one of two keys (depending on + the flavor of Windows): + + HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones\ + HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\ + + Under this key are several subkeys, one for each time zone. These + subkeys are named "Pacific" on Win9x/Me and "Pacific Standard Time" + on WinNT/2k/XP. There are some other wrinkles; see the code for + details. The subkey name is NOT LOCALIZED, allowing us to support + localized installs. + + Under the subkey are data values. We care about: + + Std Standard time display name, localized + TZI Binary block of data + + The TZI data is of particular interest. It contains the offset, two + more offsets for standard and daylight time, and the start and end + rules. This is the same data returned by the GetTimeZoneInformation + API. The API may modify the data on the way out, so we have to be + careful, but essentially we do a binary comparison against the TZI + blocks of various registry keys. When we find a match, we know what + time zone Windows is set to. Since the registry key is not + localized, we can then translate the key through a simple table + lookup into the corresponding ICU time zone. + + This strategy doesn't always work because there are zones which + share an offset and rules, so more than one TZI block will match. + For example, both Tokyo and Seoul are at GMT+9 with no DST rules; + their TZI blocks are identical. For these cases, we fall back to a + name lookup. We attempt to match the display name as stored in the + registry for the current zone to the display name stored in the + registry for various Windows zones. By comparing the registry data + directly we avoid conversion complications. + + Author: Alan Liu + Since: ICU 2.6 + Based on original code by Carl Brown <cbrown@xnetinc.com> +*/ + +/** + * Main Windows time zone detection function. Returns the Windows + * time zone, translated to an ICU time zone, or NULL upon failure. + */ +U_CFUNC const char* U_EXPORT2 +uprv_detectWindowsTimeZone() { + UErrorCode status = U_ZERO_ERROR; + UResourceBundle* bundle = NULL; + char* icuid = NULL; + char apiStdName[MAX_LENGTH_ID]; + char regStdName[MAX_LENGTH_ID]; + char tmpid[MAX_LENGTH_ID]; + int32_t len; + int id; + int errorCode; + UChar ISOcodeW[3]; /* 2 letter iso code in UTF-16*/ + char ISOcodeA[3]; /* 2 letter iso code in ansi */ + + LONG result; + TZI tziKey; + TZI tziReg; + TIME_ZONE_INFORMATION apiTZI; + + BOOL isVistaOrHigher; + BOOL tryPreVistaFallback; + OSVERSIONINFO osVerInfo; + + /* Obtain TIME_ZONE_INFORMATION from the API, and then convert it + to TZI. We could also interrogate the registry directly; we do + this below if needed. */ + uprv_memset(&apiTZI, 0, sizeof(apiTZI)); + uprv_memset(&tziKey, 0, sizeof(tziKey)); + uprv_memset(&tziReg, 0, sizeof(tziReg)); + GetTimeZoneInformation(&apiTZI); + tziKey.bias = apiTZI.Bias; + uprv_memcpy((char *)&tziKey.standardDate, (char*)&apiTZI.StandardDate, + sizeof(apiTZI.StandardDate)); + uprv_memcpy((char *)&tziKey.daylightDate, (char*)&apiTZI.DaylightDate, + sizeof(apiTZI.DaylightDate)); + + /* Convert the wchar_t* standard name to char* */ + uprv_memset(apiStdName, 0, sizeof(apiStdName)); + wcstombs(apiStdName, apiTZI.StandardName, MAX_LENGTH_ID); + + tmpid[0] = 0; + + id = GetUserGeoID(GEOCLASS_NATION); + errorCode = GetGeoInfoW(id,GEO_ISO2,ISOcodeW,3,0); + u_strToUTF8(ISOcodeA, 3, NULL, ISOcodeW, 3, &status); + + bundle = ures_openDirect(NULL, "windowsZones", &status); + ures_getByKey(bundle, "mapTimezones", bundle, &status); + + /* + Windows Vista+ provides us with a "TimeZoneKeyName" that is not localized + and can be used to directly map a name in our bundle. Try to use that first + if we're on Vista or higher + */ + uprv_memset(&osVerInfo, 0, sizeof(osVerInfo)); + osVerInfo.dwOSVersionInfoSize = sizeof(osVerInfo); + GetVersionEx(&osVerInfo); + isVistaOrHigher = osVerInfo.dwMajorVersion >= 6; /* actually includes Windows Server 2008 as well, but don't worry about it */ + tryPreVistaFallback = TRUE; + if(isVistaOrHigher) { + result = getTZKeyName(regStdName, sizeof(regStdName)); + if(ERROR_SUCCESS == result) { + UResourceBundle* winTZ = ures_getByKey(bundle, regStdName, NULL, &status); + if(U_SUCCESS(status)) { + const UChar* icuTZ = NULL; + if (errorCode != 0) { + icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status); + } + if (errorCode==0 || icuTZ==NULL) { + /* fallback to default "001" and reset status */ + status = U_ZERO_ERROR; + icuTZ = ures_getStringByKey(winTZ, "001", &len, &status); + } + + if(U_SUCCESS(status)) { + int index=0; + while (! (*icuTZ == '\0' || *icuTZ ==' ')) { + tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */ + } + tmpid[index]='\0'; + tryPreVistaFallback = FALSE; + } + } + ures_close(winTZ); + } + } + + if(tryPreVistaFallback) { + + /* Note: We get the winid not from static tables but from resource bundle. */ + while (U_SUCCESS(status) && ures_hasNext(bundle)) { + UBool idFound = FALSE; + const char* winid; + UResourceBundle* winTZ = ures_getNextResource(bundle, NULL, &status); + if (U_FAILURE(status)) { + break; + } + winid = ures_getKey(winTZ); + result = getTZI(winid, &tziReg); + + if (result == ERROR_SUCCESS) { + /* Windows alters the DaylightBias in some situations. + Using the bias and the rules suffices, so overwrite + these unreliable fields. */ + tziKey.standardBias = tziReg.standardBias; + tziKey.daylightBias = tziReg.daylightBias; + + if (uprv_memcmp((char *)&tziKey, (char*)&tziReg, sizeof(tziKey)) == 0) { + const UChar* icuTZ = NULL; + if (errorCode != 0) { + icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status); + } + if (errorCode==0 || icuTZ==NULL) { + /* fallback to default "001" and reset status */ + status = U_ZERO_ERROR; + icuTZ = ures_getStringByKey(winTZ, "001", &len, &status); + } + + if (U_SUCCESS(status)) { + /* Get the standard name from the registry key to compare with + the one from Windows API call. */ + uprv_memset(regStdName, 0, sizeof(regStdName)); + result = getSTDName(winid, regStdName, sizeof(regStdName)); + if (result == ERROR_SUCCESS) { + if (uprv_strcmp(apiStdName, regStdName) == 0) { + idFound = TRUE; + } + } + + /* tmpid buffer holds the ICU timezone ID corresponding to the timezone ID from Windows. + * If none is found, tmpid buffer will contain a fallback ID (i.e. the time zone ID matching + * the current time zone information) + */ + if (idFound || tmpid[0] == 0) { + /* if icuTZ has more than one city, take only the first (i.e. terminate icuTZ at first space) */ + int index=0; + while (! (*icuTZ == '\0' || *icuTZ ==' ')) { + tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */ + } + tmpid[index]='\0'; + } + } + } + } + ures_close(winTZ); + if (idFound) { + break; + } + } + } + + /* + * Copy the timezone ID to icuid to be returned. + */ + if (tmpid[0] != 0) { + len = uprv_strlen(tmpid); + icuid = (char*)uprv_calloc(len + 1, sizeof(char)); + if (icuid != NULL) { + uprv_strcpy(icuid, tmpid); + } + } + + ures_close(bundle); + + return icuid; +} + +#endif /* U_PLATFORM_HAS_WIN32_API */ |