690 lines
26 KiB
C
690 lines
26 KiB
C
/*
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********************************************************************************
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* Copyright (C) 2005-2008, International Business Machines
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* Corporation and others. All Rights Reserved.
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********************************************************************************
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*
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* File WINTZ.CPP
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*
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********************************************************************************
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*/
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#include "unicode/utypes.h"
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#ifdef U_WINDOWS
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#include "wintz.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "unicode/ustring.h"
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# define WIN32_LEAN_AND_MEAN
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# define VC_EXTRALEAN
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# define NOUSER
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# define NOSERVICE
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# define NOIME
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# define NOMCX
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#include <windows.h>
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#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
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#define NEW_ARRAY(type,count) (type *) uprv_malloc((count) * sizeof(type))
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#define DELETE_ARRAY(array) uprv_free((void *) (array))
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#define ICUID_STACK_BUFFER_SIZE 32
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/* The layout of the Tzi value in the registry */
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typedef struct
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{
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int32_t bias;
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int32_t standardBias;
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int32_t daylightBias;
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SYSTEMTIME standardDate;
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SYSTEMTIME daylightDate;
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} TZI;
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typedef struct
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{
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const char *icuid;
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const char *winid;
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} WindowsICUMap;
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typedef struct {
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const char* winid;
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const char* altwinid;
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} WindowsZoneRemap;
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/**
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* Various registry keys and key fragments.
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*/
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static const char CURRENT_ZONE_REGKEY[] = "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\";
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static const char STANDARD_NAME_REGKEY[] = "StandardName";
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static const char STANDARD_TIME_REGKEY[] = " Standard Time";
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static const char TZI_REGKEY[] = "TZI";
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static const char STD_REGKEY[] = "Std";
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/**
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* HKLM subkeys used to probe for the flavor of Windows. Note that we
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* specifically check for the "GMT" zone subkey; this is present on
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* NT, but on XP has become "GMT Standard Time". We need to
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* discriminate between these cases.
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*/
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static const char* const WIN_TYPE_PROBE_REGKEY[] = {
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/* WIN_9X_ME_TYPE */
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"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones",
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/* WIN_NT_TYPE */
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"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\GMT"
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/* otherwise: WIN_2K_XP_TYPE */
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};
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/**
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* The time zone root subkeys (under HKLM) for different flavors of
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* Windows.
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*/
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static const char* const TZ_REGKEY[] = {
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/* WIN_9X_ME_TYPE */
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"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Time Zones\\",
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/* WIN_NT_TYPE | WIN_2K_XP_TYPE */
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"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\"
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};
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/**
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* Flavor of Windows, from our perspective. Not a real OS version,
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* but rather the flavor of the layout of the time zone information in
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* the registry.
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*/
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enum {
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WIN_9X_ME_TYPE = 1,
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WIN_NT_TYPE = 2,
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WIN_2K_XP_TYPE = 3
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};
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# if 0
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/*
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* ZONE_MAP from supplementalData.txt
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*/
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static const WindowsICUMap NEW_ZONE_MAP[] = {
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{"Africa/Cairo", "Egypt"},
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{"Africa/Casablanca", "Greenwich"},
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{"Africa/Johannesburg", "South Africa"},
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{"Africa/Lagos", "W. Central Africa"},
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{"Africa/Nairobi", "E. Africa"},
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{"Africa/Windhoek", "Namibia"},
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{"America/Anchorage", "Alaskan"},
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{"America/Bogota", "SA Pacific"},
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{"America/Buenos_Aires", "SA Eastern"},
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{"America/Caracas", "SA Western"},
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{"America/Chicago", "Central"},
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{"America/Chihuahua", "Mountain Standard Time (Mexico)"},
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{"America/Denver", "Mountain"},
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{"America/Godthab", "Greenland"},
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{"America/Guatemala", "Central America"},
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{"America/Halifax", "Atlantic"},
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{"America/Indianapolis", "US Eastern"},
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{"America/Los_Angeles", "Pacific"},
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{"America/Manaus", "Central Brazilian"},
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{"America/Mexico_City", "Central Standard Time (Mexico)"},
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{"America/Montevideo", "Montevideo"},
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{"America/New_York", "Eastern"},
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{"America/Noronha", "Mid-Atlantic"},
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{"America/Phoenix", "US Mountain"},
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{"America/Regina", "Canada Central"},
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{"America/Santiago", "Pacific SA"},
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{"America/Sao_Paulo", "E. South America"},
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{"America/St_Johns", "Newfoundland"},
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{"America/Tijuana", "Pacific Standard Time (Mexico)"},
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{"Asia/Amman", "Jordan"},
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{"Asia/Baghdad", "Arabic"},
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{"Asia/Baku", "Azerbaijan"},
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{"Asia/Bangkok", "SE Asia"},
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{"Asia/Beirut", "Middle East"},
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{"Asia/Calcutta", "India"},
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{"Asia/Colombo", "Sri Lanka"},
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{"Asia/Dhaka", "Central Asia"},
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{"Asia/Jerusalem", "Israel"},
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{"Asia/Kabul", "Afghanistan"},
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{"Asia/Karachi", "West Asia"},
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{"Asia/Katmandu", "Nepal"},
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{"Asia/Krasnoyarsk", "North Asia"},
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{"Asia/Muscat", "Arabian"},
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{"Asia/Novosibirsk", "N. Central Asia"},
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{"Asia/Rangoon", "Myanmar"},
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{"Asia/Riyadh", "Arab"},
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{"Asia/Seoul", "Korea"},
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{"Asia/Shanghai", "China"},
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{"Asia/Singapore", "Singapore"},
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{"Asia/Taipei", "Taipei"},
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{"Asia/Tbilisi", "Georgian"},
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{"Asia/Tehran", "Iran"},
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{"Asia/Tokyo", "Tokyo"},
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{"Asia/Ulaanbaatar", "North Asia East"},
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{"Asia/Vladivostok", "Vladivostok"},
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{"Asia/Yakutsk", "Yakutsk"},
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{"Asia/Yekaterinburg", "Ekaterinburg"},
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{"Asia/Yerevan", "Caucasus"},
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{"Atlantic/Azores", "Azores"},
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{"Atlantic/Cape_Verde", "Cape Verde"},
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{"Australia/Adelaide", "Cen. Australia"},
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{"Australia/Brisbane", "E. Australia"},
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{"Australia/Darwin", "AUS Central"},
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{"Australia/Hobart", "Tasmania"},
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{"Australia/Perth", "W. Australia"},
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{"Australia/Sydney", "AUS Eastern"},
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{"Europe/Berlin", "W. Europe"},
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{"Europe/Helsinki", "FLE"},
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{"Europe/Istanbul", "GTB"},
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{"Europe/London", "GMT"},
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{"Europe/Minsk", "E. Europe"},
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{"Europe/Moscow", "Russian"},
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{"Europe/Paris", "Romance"},
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{"Europe/Prague", "Central Europe"},
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{"Europe/Warsaw", "Central European"},
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{"Pacific/Apia", "Samoa"},
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{"Pacific/Auckland", "New Zealand"},
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{"Pacific/Fiji", "Fiji"},
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{"Pacific/Guadalcanal", "Central Pacific"},
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{"Pacific/Guam", "West Pacific"},
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{"Pacific/Honolulu", "Hawaiian"},
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{"Pacific/Kwajalein", "Dateline"},
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{"Pacific/Tongatapu", "Tonga"}
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};
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#endif
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/* NOTE: Some Windows zone ids appear more than once. In such cases the
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* ICU zone id from the first one is the preferred match.
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*/
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static const WindowsICUMap ZONE_MAP[] = {
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{"Pacific/Kwajalein", "Dateline"}, /* S (GMT-12:00) International Date Line West */
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{"Etc/GMT+12", "Dateline"}, /* S (GMT-12:00) International Date Line West */
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{"Pacific/Apia", "Samoa"}, /* S (GMT-11:00) Midway Island, Samoa */
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{"Pacific/Honolulu", "Hawaiian"}, /* S (GMT-10:00) Hawaii */
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{"America/Anchorage", "Alaskan"}, /* D (GMT-09:00) Alaska */
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{"America/Los_Angeles", "Pacific"}, /* D (GMT-08:00) Pacific Time (US & Canada) */
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{"America/Tijuana", "Pacific Standard Time (Mexico)"}, /* S (GMT-08:00) Tijuana, Baja California */
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{"America/Phoenix", "US Mountain"}, /* S (GMT-07:00) Arizona */
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{"America/Denver", "Mountain"}, /* D (GMT-07:00) Mountain Time (US & Canada) */
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{"America/Chihuahua", "Mountain Standard Time (Mexico)"}, /* D (GMT-07:00) Chihuahua, La Paz, Mazatlan */
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{"America/Managua", "Central America"}, /* S (GMT-06:00) Central America */ /* America/Guatemala? */
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{"America/Regina", "Canada Central"}, /* S (GMT-06:00) Saskatchewan */
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{"America/Mexico_City", "Central Standard Time (Mexico)"}, /* D (GMT-06:00) Guadalajara, Mexico City, Monterrey */
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{"America/Chicago", "Central"}, /* D (GMT-06:00) Central Time (US & Canada) */
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{"America/Indianapolis", "US Eastern"}, /* S (GMT-05:00) Indiana (East) */
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{"America/Bogota", "SA Pacific"}, /* S (GMT-05:00) Bogota, Lima, Quito */
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{"America/New_York", "Eastern"}, /* D (GMT-05:00) Eastern Time (US & Canada) */
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{"America/Caracas", "SA Western"}, /* S (GMT-04:00) Caracas, La Paz */
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{"America/Santiago", "Pacific SA"}, /* D (GMT-04:00) Santiago */
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{"America/Halifax", "Atlantic"}, /* D (GMT-04:00) Atlantic Time (Canada) */
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{"America/Manaus", "Central Brazilian"}, /* D (GMT-04:00 Manaus */
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{"America/St_Johns", "Newfoundland"}, /* D (GMT-03:30) Newfoundland */
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{"America/Buenos_Aires", "SA Eastern"}, /* S (GMT-03:00) Buenos Aires, Georgetown */
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{"America/Godthab", "Greenland"}, /* D (GMT-03:00) Greenland */
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{"America/Sao_Paulo", "E. South America"}, /* D (GMT-03:00) Brasilia */
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{"America/Montevideo", "Montevideo"}, /* S (GMT-03:00) Montevideo */
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{"America/Noronha", "Mid-Atlantic"}, /* D (GMT-02:00) Mid-Atlantic */
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{"Atlantic/Cape_Verde", "Cape Verde"}, /* S (GMT-01:00) Cape Verde Is. */
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{"Atlantic/Azores", "Azores"}, /* D (GMT-01:00) Azores */
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{"Africa/Casablanca", "Greenwich"}, /* S (GMT) Casablanca, Monrovia */
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{"Europe/London", "GMT"}, /* D (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London */
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{"Africa/Lagos", "W. Central Africa"}, /* S (GMT+01:00) West Central Africa */
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{"Europe/Berlin", "W. Europe"}, /* D (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna */
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{"Europe/Paris", "Romance"}, /* D (GMT+01:00) Brussels, Copenhagen, Madrid, Paris */
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{"Eurpoe/Warsaw", "Central European"}, /* D (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb */
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{"Europe/Sarajevo", "Central European"}, /* D (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb */
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{"Europe/Prague", "Central Europe"}, /* D (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague */
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{"Europe/Belgrade", "Central Europe"}, /* D (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague */
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{"Africa/Johannesburg", "South Africa"}, /* S (GMT+02:00) Harare, Pretoria */
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{"Asia/Jerusalem", "Israel"}, /* S (GMT+02:00) Jerusalem */
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{"Europe/Istanbul", "GTB"}, /* D (GMT+02:00) Athens, Istanbul, Minsk */
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{"Europe/Helsinki", "FLE"}, /* D (GMT+02:00) Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius */
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{"Africa/Cairo", "Egypt"}, /* D (GMT+02:00) Cairo */
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{"Europe/Minsk", "E. Europe"}, /* D (GMT+02:00) Bucharest */
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{"Europe/Bucharest", "E. Europe"}, /* D (GMT+02:00) Bucharest */
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{"Africa/Windhoek", "Namibia"}, /* S (GMT+02:00) Windhoek */
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{"Asia/Amman", "Jordan"}, /* S (GMT+02:00) Aman */
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{"Asia/Beirut", "Middle East"}, /* S (GMT+02:00) Beirut */
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{"Africa/Nairobi", "E. Africa"}, /* S (GMT+03:00) Nairobi */
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{"Asia/Riyadh", "Arab"}, /* S (GMT+03:00) Kuwait, Riyadh */
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{"Europe/Moscow", "Russian"}, /* D (GMT+03:00) Moscow, St. Petersburg, Volgograd */
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{"Asia/Baghdad", "Arabic"}, /* D (GMT+03:00) Baghdad */
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{"Asia/Tehran", "Iran"}, /* D (GMT+03:30) Tehran */
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{"Asia/Muscat", "Arabian"}, /* S (GMT+04:00) Abu Dhabi, Muscat */
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{"Asia/Tbilisi", "Georgian"}, /* D (GMT+04:00) Tbilisi */
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{"Asia/Baku", "Azerbaijan"}, /* S (GMT+04:00) Baku */
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{"Asia/Yerevan", "Caucasus"}, /* S (GMT+04:00) Yerevan */
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{"Asia/Kabul", "Afghanistan"}, /* S (GMT+04:30) Kabul */
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{"Asia/Karachi", "West Asia"}, /* S (GMT+05:00) Islamabad, Karachi, Tashkent */
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{"Asia/Yekaterinburg", "Ekaterinburg"}, /* D (GMT+05:00) Ekaterinburg */
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{"Asia/Calcutta", "India"}, /* S (GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi */
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{"Asia/Katmandu", "Nepal"}, /* S (GMT+05:45) Kathmandu */
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{"Asia/Colombo", "Sri Lanka"}, /* S (GMT+06:00) Sri Jayawardenepura */
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{"Asia/Dhaka", "Central Asia"}, /* S (GMT+06:00) Astana, Dhaka */
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{"Asia/Novosibirsk", "N. Central Asia"}, /* D (GMT+06:00) Almaty, Novosibirsk */
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{"Asia/Rangoon", "Myanmar"}, /* S (GMT+06:30) Rangoon */
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{"Asia/Bangkok", "SE Asia"}, /* S (GMT+07:00) Bangkok, Hanoi, Jakarta */
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{"Asia/Krasnoyarsk", "North Asia"}, /* D (GMT+07:00) Krasnoyarsk */
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{"Australia/Perth", "W. Australia"}, /* S (GMT+08:00) Perth */
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{"Asia/Taipei", "Taipei"}, /* S (GMT+08:00) Taipei */
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{"Asia/Singapore", "Singapore"}, /* S (GMT+08:00) Kuala Lumpur, Singapore */
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{"Asia/Shanghai", "China"}, /* S (GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi */
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{"Asia/Hong_Kong", "China"}, /* S (GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi */
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{"Asia/Ulaanbaatar", "North Asia East"}, /* D (GMT+08:00) Irkutsk, Ulaan Bataar */
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{"Asia/Irkutsk", "North Asia East"}, /* D (GMT+08:00) Irkutsk, Ulaan Bataar */
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{"Asia/Tokyo", "Tokyo"}, /* S (GMT+09:00) Osaka, Sapporo, Tokyo */
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{"Asia/Seoul", "Korea"}, /* S (GMT+09:00) Seoul */
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{"Asia/Yakutsk", "Yakutsk"}, /* D (GMT+09:00) Yakutsk */
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{"Australia/Darwin", "AUS Central"}, /* S (GMT+09:30) Darwin */
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{"Australia/Adelaide", "Cen. Australia"}, /* D (GMT+09:30) Adelaide */
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{"Pacific/Guam", "West Pacific"}, /* S (GMT+10:00) Guam, Port Moresby */
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{"Australia/Brisbane", "E. Australia"}, /* S (GMT+10:00) Brisbane */
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{"Asia/Vladivostok", "Vladivostok"}, /* D (GMT+10:00) Vladivostok */
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{"Australia/Hobart", "Tasmania"}, /* D (GMT+10:00) Hobart */
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{"Australia/Sydney", "AUS Eastern"}, /* D (GMT+10:00) Canberra, Melbourne, Sydney */
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{"Asia/Guadalcanal", "Central Pacific"}, /* S (GMT+11:00) Magadan, Solomon Is., New Caledonia */
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{"Asia/Magadan", "Central Pacific"}, /* S (GMT+11:00) Magadan, Solomon Is., New Caledonia */
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{"Pacific/Fiji", "Fiji"}, /* S (GMT+12:00) Fiji, Kamchatka, Marshall Is. */
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{"Pacific/Auckland", "New Zealand"}, /* D (GMT+12:00) Auckland, Wellington */
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{"Pacific/Tongatapu", "Tonga"}, /* S (GMT+13:00) Nuku'alofa */
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NULL, NULL
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};
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/**
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* If a lookup fails, we attempt to remap certain Windows ids to
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* alternate Windows ids. If the alternate listed here begins with
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* '-', we use it as is (without the '-'). If it begins with '+', we
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* append a " Standard Time" if appropriate.
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*/
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static const WindowsZoneRemap ZONE_REMAP[] = {
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"Central European", "-Warsaw",
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"Central Europe", "-Prague Bratislava",
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"China", "-Beijing",
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"Greenwich", "+GMT",
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"GTB", "+GFT",
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"Arab", "+Saudi Arabia",
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"SE Asia", "+Bangkok",
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"AUS Eastern", "+Sydney",
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"Mountain Standard Time (Mexico)", "-Mexico Standard Time 2",
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"Central Standard Time (Mexico)", "+Mexico",
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NULL, NULL,
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};
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static int32_t gWinType = 0;
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static int32_t detectWindowsType()
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{
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int32_t winType;
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LONG result;
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HKEY hkey;
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/* Detect the version of windows by trying to open a sequence of
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probe keys. We don't use the OS version API because what we
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really want to know is how the registry is laid out.
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Specifically, is it 9x/Me or not, and is it "GMT" or "GMT
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Standard Time". */
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for (winType = 0; winType < 2; winType++) {
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result = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
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WIN_TYPE_PROBE_REGKEY[winType],
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0,
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KEY_QUERY_VALUE,
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&hkey);
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RegCloseKey(hkey);
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if (result == ERROR_SUCCESS) {
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break;
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}
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}
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return winType+1; // +1 to bring it inline with the enum
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}
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/*
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* TODO: Binary search sorted ZONE_MAP...
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* (u_detectWindowsTimeZone() needs them sorted by offset...)
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*/
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static const char *findWindowsZoneID(const UChar *icuid, int32_t length)
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{
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char stackBuffer[ICUID_STACK_BUFFER_SIZE];
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char *buffer = stackBuffer;
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const char *result = NULL;
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int i;
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/*
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* NOTE: >= because length doesn't include
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* trailing null.
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*/
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if (length >= ICUID_STACK_BUFFER_SIZE) {
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buffer = NEW_ARRAY(char, length + 1);
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}
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u_UCharsToChars(icuid, buffer, length);
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buffer[length] = '\0';
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for (i = 0; ZONE_MAP[i].icuid != NULL; i += 1) {
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if (uprv_strcmp(buffer, ZONE_MAP[i].icuid) == 0) {
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result = ZONE_MAP[i].winid;
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break;
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}
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}
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if (buffer != stackBuffer) {
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DELETE_ARRAY(buffer);
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}
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return result;
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}
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static LONG openTZRegKey(HKEY *hkey, const char *winid)
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{
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char subKeyName[96]; /* TODO: why 96?? */
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char *name;
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LONG result;
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/* This isn't thread safe, but it's good enough because the result should be constant per system. */
|
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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 &&
|
|
(winid[strlen(winid) - 1] != '2') &&
|
|
(winid[strlen(winid) - 1] != ')') &&
|
|
!(gWinType == WIN_NT_TYPE && strcmp(winid, "GMT") == 0))
|
|
{
|
|
uprv_strcat(subKeyName, STANDARD_TIME_REGKEY);
|
|
}
|
|
|
|
result = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
|
|
subKeyName,
|
|
0,
|
|
KEY_QUERY_VALUE,
|
|
hkey);
|
|
|
|
if (result != ERROR_SUCCESS) {
|
|
int i;
|
|
|
|
/* If the primary lookup fails, try to remap the Windows zone
|
|
ID, according to the remapping table. */
|
|
for (i=0; ZONE_REMAP[i].winid; i++) {
|
|
if (uprv_strcmp(winid, ZONE_REMAP[i].winid) == 0) {
|
|
uprv_strcpy(name, ZONE_REMAP[i].altwinid + 1);
|
|
if (*(ZONE_REMAP[i].altwinid) == '+' && gWinType != WIN_9X_ME_TYPE) {
|
|
uprv_strcat(subKeyName, STANDARD_TIME_REGKEY);
|
|
}
|
|
return 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;
|
|
}
|
|
|
|
U_CAPI UBool U_EXPORT2
|
|
uprv_getWindowsTimeZoneInfo(TIME_ZONE_INFORMATION *zoneInfo, const UChar *icuid, int32_t length)
|
|
{
|
|
const char *winid;
|
|
TZI tzi;
|
|
LONG result;
|
|
|
|
winid = findWindowsZoneID(icuid, length);
|
|
|
|
if (winid != NULL) {
|
|
result = getTZI(winid, &tzi);
|
|
|
|
if (result == ERROR_SUCCESS) {
|
|
zoneInfo->Bias = tzi.bias;
|
|
zoneInfo->DaylightBias = tzi.daylightBias;
|
|
zoneInfo->StandardBias = tzi.standardBias;
|
|
zoneInfo->DaylightDate = tzi.daylightDate;
|
|
zoneInfo->StandardDate = tzi.standardDate;
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
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() {
|
|
LONG result;
|
|
HKEY hkey;
|
|
TZI tziKey;
|
|
TZI tziReg;
|
|
TIME_ZONE_INFORMATION apiTZI;
|
|
int firstMatch, lastMatch;
|
|
int j;
|
|
|
|
/* 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));
|
|
|
|
/* For each zone that can be identified by Offset+Rules, see if we
|
|
have a match. Continue scanning after finding a match,
|
|
recording the index of the first and the last match. We have
|
|
to do this because some zones are not unique under
|
|
Offset+Rules. */
|
|
firstMatch = -1;
|
|
lastMatch = -1;
|
|
for (j=0; ZONE_MAP[j].icuid; j++) {
|
|
result = getTZI(ZONE_MAP[j].winid, &tziReg);
|
|
|
|
if (result == ERROR_SUCCESS) {
|
|
/* Assume that offsets are grouped together, and bail out
|
|
when we've scanned everything with a matching
|
|
offset. */
|
|
if (firstMatch >= 0 && tziKey.bias != tziReg.bias) {
|
|
break;
|
|
}
|
|
|
|
/* 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) {
|
|
if (firstMatch < 0) {
|
|
firstMatch = j;
|
|
}
|
|
|
|
lastMatch = j;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This should never happen; if it does it means our table doesn't
|
|
match Windows AT ALL, perhaps because this is post-XP? */
|
|
if (firstMatch < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (firstMatch != lastMatch) {
|
|
char stdName[32];
|
|
DWORD stdNameSize;
|
|
char stdRegName[64];
|
|
DWORD stdRegNameSize;
|
|
|
|
/* Offset+Rules lookup yielded >= 2 matches. Try to match the
|
|
localized display name. Get the name from the registry
|
|
(not the API). This avoids conversion issues. Use the
|
|
standard name, since Windows modifies the daylight name to
|
|
match the standard name if there is no DST. */
|
|
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
|
|
CURRENT_ZONE_REGKEY,
|
|
0,
|
|
KEY_QUERY_VALUE,
|
|
&hkey) == ERROR_SUCCESS)
|
|
{
|
|
stdNameSize = sizeof(stdName);
|
|
result = RegQueryValueExA(hkey,
|
|
STANDARD_NAME_REGKEY,
|
|
NULL,
|
|
NULL,
|
|
(LPBYTE)stdName,
|
|
&stdNameSize);
|
|
RegCloseKey(hkey);
|
|
|
|
/*
|
|
* Scan through the Windows time zone data in the registry
|
|
* again (just the range of zones with matching TZIs) and
|
|
* look for a standard display name match.
|
|
*/
|
|
for (j = firstMatch; j <= lastMatch; j += 1) {
|
|
stdRegNameSize = sizeof(stdRegName);
|
|
result = openTZRegKey(&hkey, ZONE_MAP[j].winid);
|
|
|
|
if (result == ERROR_SUCCESS) {
|
|
result = RegQueryValueExA(hkey,
|
|
STD_REGKEY,
|
|
NULL,
|
|
NULL,
|
|
(LPBYTE)stdRegName,
|
|
&stdRegNameSize);
|
|
}
|
|
|
|
RegCloseKey(hkey);
|
|
|
|
if (result == ERROR_SUCCESS &&
|
|
stdRegNameSize == stdNameSize &&
|
|
uprv_memcmp(stdName, stdRegName, stdNameSize) == 0)
|
|
{
|
|
firstMatch = j; /* record the match */
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
RegCloseKey(hkey); /* should never get here */
|
|
}
|
|
}
|
|
|
|
return ZONE_MAP[firstMatch].icuid;
|
|
}
|
|
|
|
#endif /* #ifdef U_WINDOWS */
|