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CFTimeZone.c
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/* CFTimeZone.c
Copyright (c) 1998-2018, Apple Inc. and the Swift project authors
Portions Copyright (c) 2014-2018, Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
Responsibility: Christopher Kane
*/
#include <CoreFoundation/CFTimeZone.h>
#include <CoreFoundation/CFPropertyList.h>
#include <CoreFoundation/CFDateFormatter.h>
#include <CoreFoundation/CFPriv.h>
#include "CFInternal.h"
#include "CFRuntime_Internal.h"
#include <math.h>
#include <limits.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unicode/ucal.h>
#include <unicode/udat.h>
#include <unicode/ustring.h>
#include <CoreFoundation/CFDateFormatter.h>
#if TARGET_OS_MAC || TARGET_OS_LINUX || TARGET_OS_BSD
#include <dirent.h>
#include <unistd.h>
#if !TARGET_OS_ANDROID
#include <sys/fcntl.h>
#else
#include <sys/endian.h>
#endif
#endif
#if TARGET_OS_WIN32
#include <tchar.h>
#include "WindowsResources.h"
#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#include "Windows.h"
#endif
#if TARGET_OS_MAC
#include <tzfile.h>
#define MACOS_TZDIR1 "/usr/share/zoneinfo/" // 10.12 and earlier
#define MACOS_TZDIR2 "/var/db/timezone/zoneinfo/" // 10.13 onwards
#elif TARGET_OS_LINUX || TARGET_OS_BSD
#ifndef TZDIR
#define TZDIR "/usr/share/zoneinfo/" /* Time zone object file directory */
#endif /* !defined TZDIR */
#ifndef TZDEFAULT
#define TZDEFAULT "/etc/localtime"
#endif /* !defined TZDEFAULT */
#endif
#if TARGET_OS_LINUX || TARGET_OS_BSD || TARGET_OS_WIN32
struct tzhead {
char tzh_magic[4]; /* TZ_MAGIC */
char tzh_reserved[16]; /* reserved for future use */
char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
char tzh_leapcnt[4]; /* coded number of leap seconds */
char tzh_timecnt[4]; /* coded number of transition times */
char tzh_typecnt[4]; /* coded number of local time types */
char tzh_charcnt[4]; /* coded number of abbr. chars */
};
#endif
#include <time.h>
#if !TARGET_OS_WIN32 && !TARGET_OS_ANDROID
static CFStringRef __tzZoneInfo = NULL;
static char *__tzDir = NULL;
static void __InitTZStrings(void);
#endif
CONST_STRING_DECL(kCFTimeZoneSystemTimeZoneDidChangeNotification, "kCFTimeZoneSystemTimeZoneDidChangeNotification")
static CFTimeZoneRef __CFTimeZoneSystem = NULL;
static CFTimeZoneRef __CFTimeZoneDefault = NULL;
static CFDictionaryRef __CFTimeZoneAbbreviationDict = NULL;
static CFLock_t __CFTimeZoneAbbreviationLock = CFLockInit;
static CFMutableDictionaryRef __CFTimeZoneCompatibilityMappingDict = NULL;
static CFLock_t __CFTimeZoneCompatibilityMappingLock = CFLockInit;
static CFArrayRef __CFKnownTimeZoneList = NULL;
static CFMutableDictionaryRef __CFTimeZoneCache = NULL;
static CFLock_t __CFTimeZoneGlobalLock = CFLockInit;
#if TARGET_OS_WIN32
static CFDictionaryRef __CFTimeZoneWinToOlsonDict = NULL;
static CFLock_t __CFTimeZoneWinToOlsonLock = CFLockInit;
#endif
CF_INLINE void __CFTimeZoneLockGlobal(void) {
__CFLock(&__CFTimeZoneGlobalLock);
}
CF_INLINE void __CFTimeZoneUnlockGlobal(void) {
__CFUnlock(&__CFTimeZoneGlobalLock);
}
CF_INLINE void __CFTimeZoneLockAbbreviations(void) {
__CFLock(&__CFTimeZoneAbbreviationLock);
}
CF_INLINE void __CFTimeZoneUnlockAbbreviations(void) {
__CFUnlock(&__CFTimeZoneAbbreviationLock);
}
CF_INLINE void __CFTimeZoneLockCompatibilityMapping(void) {
__CFLock(&__CFTimeZoneCompatibilityMappingLock);
}
CF_INLINE void __CFTimeZoneUnlockCompatibilityMapping(void) {
__CFUnlock(&__CFTimeZoneCompatibilityMappingLock);
}
#define COUNT_OF(array) (sizeof((array)) / sizeof((array)[0]))
#if TARGET_OS_WIN32
#define CF_TIME_ZONES_KEY L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones"
/* This function should be used for WIN32 instead of
* __CFCopyRecursiveDirectoryList function.
* It takes TimeZone names from the registry
* (Aleksey Dukhnyakov)
*/
static CFMutableArrayRef __CFCopyWindowsTimeZoneList() {
CFMutableArrayRef result = NULL;
HKEY hkResult;
WCHAR szName[MAX_PATH + 1];
DWORD dwIndex, retCode;
if (RegOpenKeyW(HKEY_LOCAL_MACHINE, CF_TIME_ZONES_KEY, &hkResult) != ERROR_SUCCESS)
return NULL;
result = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
for (dwIndex = 0; (retCode = RegEnumKeyW(hkResult, dwIndex, szName, COUNT_OF(szName) - 1)) != ERROR_NO_MORE_ITEMS; dwIndex++) {
if (retCode != ERROR_SUCCESS) {
RegCloseKey(hkResult);
CFRelease(result);
return NULL;
} else {
CFStringRef string = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (const UInt8 *)szName, (wcslen(szName) * sizeof(WCHAR)), kCFStringEncodingUTF16, false);
CFArrayAppendValue(result, string);
CFRelease(string);
}
}
RegCloseKey(hkResult);
return result;
}
static void __CFTimeZoneGetOffset(CFStringRef timezone, int32_t *offset) {
typedef struct _REG_TZI_FORMAT {
LONG Bias;
LONG StandardBias;
LONG DaylightBias;
SYSTEMTIME StandardDate;
SYSTEMTIME DaylightDate;
} REG_TZI_FORMAT;
WCHAR szRegKey[COUNT_OF(CF_TIME_ZONES_KEY) + 1 + COUNT_OF(((TIME_ZONE_INFORMATION *)0)->StandardName) + 1];
REG_TZI_FORMAT tziInfo;
Boolean bResult;
DWORD cbData;
HKEY hKey;
*offset = 0;
memset(szRegKey, 0, sizeof(szRegKey));
wcscpy(szRegKey, CF_TIME_ZONES_KEY);
szRegKey[COUNT_OF(CF_TIME_ZONES_KEY) - 1] = L'\\';
CFStringGetBytes(timezone, CFRangeMake(0, CFStringGetLength(timezone)), kCFStringEncodingUnicode, FALSE, FALSE, (uint8_t *)&szRegKey[wcslen(CF_TIME_ZONES_KEY) + 1], sizeof(((TIME_ZONE_INFORMATION *)0)->StandardName) + sizeof(WCHAR), NULL);
if (RegOpenKeyW(HKEY_LOCAL_MACHINE, szRegKey, &hKey) != ERROR_SUCCESS)
return;
cbData = sizeof(tziInfo);
if (RegQueryValueExW(hKey, L"TZI", NULL, NULL, (LPBYTE)&tziInfo, &cbData) == ERROR_SUCCESS)
*offset = tziInfo.Bias;
RegCloseKey(hKey);
}
#elif TARGET_OS_ANDROID
/*
* Android does not ship with the standard Unix Olsen files, with the directory
* structure, and the files with the same name as the time zone.
* Instead all the information is in one file, where all the time zone
* information for all the zones is held. Also, to allow upgrades to the time
* zone database without an update to the system, the database can be overriden
* by a secondary location.
* - /data/misc/zoneinfo/current/tzdata overrides for the time zone information
* from the system.
* - /system/usr/share/zoneinfo/tzdata system time zone information.
* The format of these files is slightly documented in Bionic's source file
* libc/tzcode/bionic.cpp.
* The file start with a header which is 24 bytes long.
* - 6 bytes should be the ASCII string "tzdata"
* - 6 bytes of the Olson database version in ASCII. For example 2018a. Includes
* a final nul character.
* - 4 bytes MSB of the offset of the index inside the file.
* - 4 bytes MSB of the offset of the start of the data inside the file.
* - 4 bytes MSB of the zonetab (unused in this code).
* The index sits between the offset for the index and the offset for the data.
* Each index entry is 52 bytes long.
* - 40 bytes for the name of the zone. Seems to be nul terminated.
* - 4 bytes MSB of the offset to this time zone data. Notice that this offset
* is relative to the data offset from the header.
* - 4 bytes MSB of the data length.
* - 4 bytes unused.
*/
#define ANDROID_TZ_HEADER_SIZE 24
#define ANDROID_TZ_HEADER_TAG_SIZE 6
#define ANDROID_TZ_HEADER_INDEX_OFFSET 12
#define ANDROID_TZ_HEADER_DATA_OFFSET 16
#define ANDROID_TZ_ENTRY_SIZE 52
#define ANDROID_TZ_ENTRY_NAME_LENGTH 40
#define ANDROID_TZ_ENTRY_START_OFFSET 40
#define ANDROID_TZ_ENTRY_LENGTH_OFFSET 44
/**
* Callback invoked for each of the time zones in the timezone file.
* - name: The name of the time zone.
* - offset: The final offset inside the file of the data for the time zone.
* - length: The length of the data for the time zone.
* - fp: The file pointer to read the data from. The file might not be in the
* right offset, so if you want to read the right time zone data, you
* probably want to fseek into offset.
* - context1: The argument passed into __CFAndroidTimeZoneListEnumerate.
* - context2: The argument passed into __CFAndroidTimeZoneListEnumerate.
*/
typedef Boolean (*__CFAndroidTimeZoneListEnumerateCallback)(const char name[ANDROID_TZ_ENTRY_NAME_LENGTH], int32_t offset, int32_t length, FILE *fp, void *context1, void *context2);
static void __CFAndroidTimeZoneParse(FILE *fp, __CFAndroidTimeZoneListEnumerateCallback callback, void *context1, void *context2) {
if (!fp) {
return;
}
char header[ANDROID_TZ_HEADER_SIZE];
if (fread(header, 1, sizeof(header), fp) != sizeof(header)) {
return;
}
if (strncmp(header, "tzdata", ANDROID_TZ_HEADER_TAG_SIZE) != 0) {
return;
}
int32_t indexOffset;
memcpy(&indexOffset, &header[ANDROID_TZ_HEADER_INDEX_OFFSET], sizeof(int32_t));
indexOffset = betoh32(indexOffset);
int32_t dataOffset;
memcpy(&dataOffset, &header[ANDROID_TZ_HEADER_DATA_OFFSET], sizeof(int32_t));
dataOffset = betoh32(dataOffset);
if (indexOffset < 0 || dataOffset < indexOffset) {
return;
}
if (fseek(fp, indexOffset, SEEK_SET) != 0) {
return;
}
char entry[52];
size_t indexSize = dataOffset - indexOffset;
size_t zoneCount = indexSize / sizeof(entry);
if (zoneCount * sizeof(entry) != indexSize) {
return;
}
for (size_t idx = 0; idx < zoneCount; idx++) {
if (fread(entry, 1, sizeof(entry), fp) != sizeof(entry)) {
break;
}
int32_t start;
memcpy(&start, &entry[ANDROID_TZ_ENTRY_START_OFFSET], sizeof(int32_t));
start = betoh32(start);
start += dataOffset;
int32_t length;
memcpy(&length, &entry[ANDROID_TZ_ENTRY_LENGTH_OFFSET], sizeof(int32_t));
length = betoh32(length);
if (start < 0 || length < 0) {
break;
}
long pos = ftell(fp);
Boolean done = callback(entry, start, length, fp, context1, context2);
if (done || fseek(fp, pos, SEEK_SET) != 0) {
break;
}
}
}
static void __CFAndroidTimeZoneListEnumerate(__CFAndroidTimeZoneListEnumerateCallback callback, void *context1, void *context2) {
// The best reference should be Android Bionic's libc/tzcode/bionic.cpp
static const char *tzDataFiles[] = {
"/data/misc/zoneinfo/current/tzdata",
"/system/usr/share/zoneinfo/tzdata"
};
for (int idx = 0; idx < COUNT_OF(tzDataFiles); idx++) {
FILE *fp = fopen(tzDataFiles[idx], "rb");
__CFAndroidTimeZoneParse(fp, callback, context1, context2);
if (fp) {
fclose(fp);
}
}
}
static Boolean __CFCopyAndroidTimeZoneListCallback(const char name[ANDROID_TZ_ENTRY_NAME_LENGTH], int32_t start, int32_t length, FILE *fp, void *context1, void *context2) {
CFMutableArrayRef result = (CFMutableArrayRef)context1;
CFStringRef timeZoneName = CFStringCreateWithCString(kCFAllocatorSystemDefault, name, kCFStringEncodingASCII);
CFArrayAppendValue(result, timeZoneName);
CFRelease(timeZoneName);
return FALSE;
}
static Boolean __CFTimeZoneDataCreateCallback(const char name[ANDROID_TZ_ENTRY_NAME_LENGTH], int32_t start, int32_t length, FILE *fp, void *context1, void *context2) {
char *tzNameCstr = (char *)context1;
CFDataRef *dataPtr = (CFDataRef *)context2;
if (strncmp(tzNameCstr, name, ANDROID_TZ_ENTRY_NAME_LENGTH) == 0) {
if (fseek(fp, start, SEEK_SET) != 0) {
return TRUE;
}
uint8_t *bytes = malloc(length);
if (!bytes) {
return TRUE;
}
if (fread(bytes, 1, length, fp) != length) {
free(bytes);
return TRUE;
}
*dataPtr = CFDataCreate(kCFAllocatorSystemDefault, bytes, length);
free(bytes);
return TRUE;
}
return FALSE;
}
static CFMutableArrayRef __CFCopyAndroidTimeZoneList() {
CFMutableArrayRef result = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
__CFAndroidTimeZoneListEnumerate(__CFCopyAndroidTimeZoneListCallback, result, NULL);
return result;
}
#elif TARGET_OS_MAC || TARGET_OS_LINUX || TARGET_OS_BSD
static CFMutableArrayRef __CFCopyRecursiveDirectoryList() {
CFMutableArrayRef result = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &kCFTypeArrayCallBacks);
#if !TARGET_OS_ANDROID
if (!__tzDir) __InitTZStrings();
if (!__tzDir) return result;
#endif
int fd = open(__tzDir, O_RDONLY);
for (; 0 <= fd;) {
uint8_t buffer[4096];
ssize_t len = read(fd, buffer, sizeof(buffer));
if (len <= 0) break;
if (len < sizeof(buffer)) {
// assumes that partial read only occurs at the end of the file
buffer[len] = '\n';
len++;
}
const uint8_t *bytes = buffer;
for (;;) {
const uint8_t *nextl = memchr(bytes, '\n', len);
if (!nextl) break;
nextl++;
if ('#' == *bytes) {
len -= (nextl - bytes);
bytes = nextl;
continue;
}
const uint8_t *tab1 = memchr(bytes, '\t', (nextl - bytes));
if (!tab1) {
len -= (nextl - bytes);
bytes = nextl;
continue;
}
tab1++;
len -= (tab1 - bytes);
bytes = tab1;
const uint8_t *tab2 = memchr(bytes, '\t', (nextl - bytes));
if (!tab2) {
len -= (nextl - bytes);
bytes = nextl;
continue;
}
tab2++;
len -= (tab2 - bytes);
bytes = tab2;
const uint8_t *tab3 = memchr(bytes, '\t', (nextl - bytes));
int nmlen = tab3 ? (tab3 - bytes) : (nextl - 1 - bytes);
CFStringRef string = CFStringCreateWithBytes(kCFAllocatorSystemDefault, bytes, nmlen, kCFStringEncodingUTF8, false);
CFArrayAppendValue(result, string);
CFRelease(string);
len -= (nextl - bytes);
bytes = nextl;
}
lseek(fd, -len, SEEK_CUR);
}
close(fd);
return result;
}
#else
#error Unknown or unspecified DEPLOYMENT_TARGET
#endif
typedef struct _CFTZPeriod {
int32_t startSec;
CFStringRef abbrev;
uint32_t info;
} CFTZPeriod;
struct __CFTimeZone {
CFRuntimeBase _base;
CFStringRef _name; /* immutable */
CFDataRef _data; /* immutable */
CFTZPeriod *_periods; /* immutable */
int32_t _periodCnt; /* immutable */
};
/* startSec is the whole integer seconds from a CFAbsoluteTime, giving dates
* between 1933 and 2069; info outside these years is discarded on read-in */
/* Bits 31-18 of the info are unused */
/* Bit 17 of the info is used for the is-DST state */
/* Bit 16 of the info is used for the sign of the offset (1 == negative) */
/* Bits 15-0 of the info are used for abs(offset) in seconds from GMT */
CF_INLINE void __CFTZPeriodInit(CFTZPeriod *period, int32_t startTime, CFStringRef abbrev, int32_t offset, Boolean isDST) {
period->startSec = startTime;
period->abbrev = abbrev ? (CFStringRef)CFRetain(abbrev) : NULL;
__CFBitfieldSetValue(period->info, 15, 0, abs(offset));
__CFBitfieldSetValue(period->info, 16, 16, (offset < 0 ? 1 : 0));
__CFBitfieldSetValue(period->info, 17, 17, (isDST ? 1 : 0));
}
CF_INLINE int32_t __CFTZPeriodStartSeconds(const CFTZPeriod *period) {
return period->startSec;
}
CF_INLINE CFStringRef __CFTZPeriodAbbreviation(const CFTZPeriod *period) {
return period->abbrev;
}
CF_INLINE int32_t __CFTZPeriodGMTOffset(const CFTZPeriod *period) {
int32_t v = __CFBitfieldGetValue(period->info, 15, 0);
if (__CFBitfieldGetValue(period->info, 16, 16)) v = -v;
return v;
}
CF_INLINE Boolean __CFTZPeriodIsDST(const CFTZPeriod *period) {
return (Boolean)__CFBitfieldGetValue(period->info, 17, 17);
}
static CFComparisonResult __CFCompareTZPeriods(const void *val1, const void *val2, void *context) {
CFTZPeriod *tzp1 = (CFTZPeriod *)val1;
CFTZPeriod *tzp2 = (CFTZPeriod *)val2;
// we treat equal as less than, as the code which uses the
// result of the bsearch doesn't expect exact matches
// (they're pretty rare, so no point in over-coding for them)
if (__CFTZPeriodStartSeconds(tzp1) <= __CFTZPeriodStartSeconds(tzp2)) return kCFCompareLessThan;
return kCFCompareGreaterThan;
}
static CFIndex __CFBSearchTZPeriods(CFTimeZoneRef tz, CFAbsoluteTime at) {
CFTZPeriod elem;
__CFTZPeriodInit(&elem, (int32_t)floor(at + 1.0), NULL, 0, false);
CFIndex idx = CFBSearch(&elem, sizeof(CFTZPeriod), tz->_periods, tz->_periodCnt, __CFCompareTZPeriods, NULL);
if (tz->_periodCnt <= idx) {
idx = tz->_periodCnt;
} else if (0 == idx) {
idx = 1;
}
return idx - 1;
}
CF_INLINE int32_t __CFDetzcode(const unsigned char *bufp) {
int32_t result = (bufp[0] & 0x80) ? ~0L : 0L;
result = (result << 8) | (bufp[0] & 0xff);
result = (result << 8) | (bufp[1] & 0xff);
result = (result << 8) | (bufp[2] & 0xff);
result = (result << 8) | (bufp[3] & 0xff);
return result;
}
CF_INLINE void __CFEntzcode(int32_t value, unsigned char *bufp) {
bufp[0] = (value >> 24) & 0xff;
bufp[1] = (value >> 16) & 0xff;
bufp[2] = (value >> 8) & 0xff;
bufp[3] = (value >> 0) & 0xff;
}
static Boolean __CFParseTimeZoneData(CFAllocatorRef allocator, CFDataRef data, CFTZPeriod **tzpp, CFIndex *cntp) {
int32_t len, timecnt, typecnt, charcnt, idx, cnt;
const uint8_t *p, *timep, *typep, *ttisp, *charp;
CFStringRef *abbrs;
Boolean result = true;
p = CFDataGetBytePtr(data);
len = CFDataGetLength(data);
if (len < (int32_t)sizeof(struct tzhead)) {
return false;
}
if (!(p[0] == 'T' && p[1] == 'Z' && p[2] == 'i' && p[3] == 'f')) return false; /* Don't parse without TZif at head of file */
p += 20 + 4 + 4 + 4; /* skip reserved, ttisgmtcnt, ttisstdcnt, leapcnt */
timecnt = __CFDetzcode(p);
p += 4;
typecnt = __CFDetzcode(p);
p += 4;
charcnt = __CFDetzcode(p);
p += 4;
if (typecnt <= 0 || timecnt < 0 || charcnt < 0) {
return false;
}
if (1024 < timecnt || 32 < typecnt || 128 < charcnt) {
// reject excessive timezones to avoid arithmetic overflows for
// security reasons and to reject potentially corrupt files
return false;
}
if (len - (int32_t)sizeof(struct tzhead) < (4 + 1) * timecnt + (4 + 1 + 1) * typecnt + charcnt) {
return false;
}
timep = p;
typep = timep + 4 * timecnt;
ttisp = typep + timecnt;
charp = ttisp + (4 + 1 + 1) * typecnt;
cnt = (0 < timecnt) ? timecnt : 1;
*tzpp = CFAllocatorAllocate(allocator, cnt * sizeof(CFTZPeriod), 0);
if (__CFOASafe) __CFSetLastAllocationEventName(*tzpp, "CFTimeZone (store)");
memset(*tzpp, 0, cnt * sizeof(CFTZPeriod));
abbrs = CFAllocatorAllocate(allocator, (charcnt + 1) * sizeof(CFStringRef), 0);
if (__CFOASafe) __CFSetLastAllocationEventName(abbrs, "CFTimeZone (temp)");
for (idx = 0; idx < charcnt + 1; idx++) {
abbrs[idx] = NULL;
}
for (idx = 0; idx < cnt; idx++) {
CFAbsoluteTime at;
int32_t itime, offset;
uint8_t type, dst, abbridx;
at = (CFAbsoluteTime)(__CFDetzcode(timep) + 0.0) - kCFAbsoluteTimeIntervalSince1970;
if (0 == timecnt) itime = INT_MIN;
else if (at < (CFAbsoluteTime)INT_MIN) itime = INT_MIN;
else if ((CFAbsoluteTime)INT_MAX < at) itime = INT_MAX;
else itime = (int32_t)at;
timep += 4; /* harmless if 0 == timecnt */
type = (0 < timecnt) ? (uint8_t)*typep++ : 0;
if (typecnt <= type) {
result = false;
break;
}
offset = __CFDetzcode(ttisp + 6 * type);
dst = (uint8_t)*(ttisp + 6 * type + 4);
if (0 != dst && 1 != dst) {
result = false;
break;
}
abbridx = (uint8_t)*(ttisp + 6 * type + 5);
if (charcnt < abbridx) {
result = false;
break;
}
if (NULL == abbrs[abbridx]) {
abbrs[abbridx] = CFStringCreateWithCString(allocator, (char *)&charp[abbridx], kCFStringEncodingASCII);
}
__CFTZPeriodInit(*tzpp + idx, itime, abbrs[abbridx], offset, (dst ? true : false));
}
for (idx = 0; idx < charcnt + 1; idx++) {
if (NULL != abbrs[idx]) {
CFRelease(abbrs[idx]);
}
}
CFAllocatorDeallocate(allocator, abbrs);
if (result) {
// dump all but the last INT_MIN and the first INT_MAX
for (idx = 0; idx < cnt; idx++) {
if (((*tzpp + idx)->startSec == INT_MIN) && (idx + 1 < cnt) && (((*tzpp + idx + 1)->startSec == INT_MIN))) {
if (NULL != (*tzpp + idx)->abbrev) CFRelease((*tzpp + idx)->abbrev);
cnt--;
memmove((*tzpp + idx), (*tzpp + idx + 1), sizeof(CFTZPeriod) * (cnt - idx));
idx--;
}
}
// Don't combine these loops! Watch the idx decrementing...
for (idx = 0; idx < cnt; idx++) {
if (((*tzpp + idx)->startSec == INT_MAX) && (0 < idx) && (((*tzpp + idx - 1)->startSec == INT_MAX))) {
if (NULL != (*tzpp + idx)->abbrev) CFRelease((*tzpp + idx)->abbrev);
cnt--;
memmove((*tzpp + idx), (*tzpp + idx + 1), sizeof(CFTZPeriod) * (cnt - idx));
idx--;
}
}
CFQSortArray(*tzpp, cnt, sizeof(CFTZPeriod), __CFCompareTZPeriods, NULL);
// if the first period is in DST and there is more than one period, drop it
if (1 < cnt && __CFTZPeriodIsDST(*tzpp + 0)) {
if (NULL != (*tzpp + 0)->abbrev) CFRelease((*tzpp + 0)->abbrev);
cnt--;
memmove((*tzpp + 0), (*tzpp + 0 + 1), sizeof(CFTZPeriod) * (cnt - 0));
}
*cntp = cnt;
} else {
CFAllocatorDeallocate(allocator, *tzpp);
*tzpp = NULL;
}
return result;
}
static Boolean __CFTimeZoneEqual(CFTypeRef cf1, CFTypeRef cf2) {
CFTimeZoneRef tz1 = (CFTimeZoneRef)cf1;
CFTimeZoneRef tz2 = (CFTimeZoneRef)cf2;
if (!CFEqual(CFTimeZoneGetName(tz1), CFTimeZoneGetName(tz2))) return false;
if (!CFEqual(CFTimeZoneGetData(tz1), CFTimeZoneGetData(tz2))) return false;
return true;
}
static CFHashCode __CFTimeZoneHash(CFTypeRef cf) {
CFTimeZoneRef tz = (CFTimeZoneRef)cf;
return CFHash(CFTimeZoneGetName(tz));
}
static CFStringRef __CFTimeZoneCopyDescription(CFTypeRef cf) {
CFTimeZoneRef tz = (CFTimeZoneRef)cf;
CFStringRef result, abbrev;
CFAbsoluteTime at;
at = CFAbsoluteTimeGetCurrent();
abbrev = CFTimeZoneCopyAbbreviation(tz, at);
result = CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("<CFTimeZone %p [%p]>{name = %@; abbreviation = %@; GMT offset = %g; is DST = %s}"), cf, CFGetAllocator(tz), tz->_name, abbrev, CFTimeZoneGetSecondsFromGMT(tz, at), CFTimeZoneIsDaylightSavingTime(tz, at) ? "true" : "false");
CFRelease(abbrev);
return result;
}
static void __CFTimeZoneDeallocate(CFTypeRef cf) {
CFTimeZoneRef tz = (CFTimeZoneRef)cf;
CFAllocatorRef allocator = CFGetAllocator(tz);
CFIndex idx;
if (tz->_name) CFRelease(tz->_name);
if (tz->_data) CFRelease(tz->_data);
for (idx = 0; idx < tz->_periodCnt; idx++) {
if (NULL != tz->_periods[idx].abbrev) CFRelease(tz->_periods[idx].abbrev);
}
if (NULL != tz->_periods) CFAllocatorDeallocate(allocator, tz->_periods);
}
const CFRuntimeClass __CFTimeZoneClass = {
0,
"CFTimeZone",
NULL, // init
NULL, // copy
__CFTimeZoneDeallocate,
__CFTimeZoneEqual,
__CFTimeZoneHash,
NULL, //
__CFTimeZoneCopyDescription
};
CFTypeID CFTimeZoneGetTypeID(void) {
return _kCFRuntimeIDCFTimeZone;
}
#if TARGET_OS_WIN32
CF_INLINE void __CFTimeZoneLockWinToOlson(void) {
__CFLock(&__CFTimeZoneWinToOlsonLock);
}
CF_INLINE void __CFTimeZoneUnlockWinToOlson(void) {
__CFUnlock(&__CFTimeZoneWinToOlsonLock);
}
static Boolean CFTimeZoneLoadPlistResource(LPCSTR lpName, LPVOID *ppResource, LPDWORD pdwSize) {
HRSRC hResource;
HGLOBAL hMemory;
HMODULE hModule;
if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
(LPCWSTR)&CFTimeZoneLoadPlistResource, &hModule)) {
return FALSE;
}
hResource = FindResourceA(hModule, lpName, "PLIST");
if (hResource == NULL) {
return FALSE;
}
hMemory = LoadResource(hModule, hResource);
if (hMemory == NULL) {
return FALSE;
}
*pdwSize = SizeofResource(hModule, hResource);
*ppResource = LockResource(hMemory);
return *pdwSize && *ppResource;
}
CFDictionaryRef CFTimeZoneCopyWinToOlsonDictionary(void) {
CFDictionaryRef dict;
__CFTimeZoneLockWinToOlson();
if (NULL == __CFTimeZoneWinToOlsonDict) {
const uint8_t *plist;
DWORD dwSize;
if (CFTimeZoneLoadPlistResource(MAKEINTRESOURCEA(IDR_WINDOWS_OLSON_MAPPING), (LPVOID *)&plist, &dwSize)) {
CFDataRef data = CFDataCreate(kCFAllocatorSystemDefault, plist, dwSize);
__CFTimeZoneWinToOlsonDict = (CFDictionaryRef)CFPropertyListCreateFromXMLData(kCFAllocatorSystemDefault, data, kCFPropertyListImmutable, NULL);
CFRelease(data);
}
}
if (NULL == __CFTimeZoneWinToOlsonDict) {
__CFTimeZoneWinToOlsonDict = CFDictionaryCreate(kCFAllocatorSystemDefault, NULL, NULL, 0, NULL, NULL);
}
dict = __CFTimeZoneWinToOlsonDict ? (CFDictionaryRef)CFRetain(__CFTimeZoneWinToOlsonDict) : NULL;
__CFTimeZoneUnlockWinToOlson();
return dict;
}
static CFDictionaryRef CFTimeZoneCopyOlsonToWindowsDictionary(void) {
static CFDictionaryRef dict;
static CFLock_t lock;
__CFLock(&lock);
if (dict == NULL) {
const uint8_t *plist;
DWORD dwSize;
if (CFTimeZoneLoadPlistResource(MAKEINTRESOURCEA(IDR_OLSON_WINDOWS_MAPPING), (LPVOID *)&plist, &dwSize)) {
CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorSystemDefault, plist, dwSize, kCFAllocatorNull);
dict = CFPropertyListCreateFromXMLData(kCFAllocatorSystemDefault, data, kCFPropertyListImmutable, NULL);
CFRelease(data);
}
}
__CFUnlock(&lock);
return dict ? CFRetain(dict) : NULL;
}
void CFTimeZoneSetWinToOlsonDictionary(CFDictionaryRef dict) {
__CFGenericValidateType(dict, CFDictionaryGetTypeID());
__CFTimeZoneLockWinToOlson();
if (dict != __CFTimeZoneWinToOlsonDict) {
CFDictionaryRef oldDict = __CFTimeZoneWinToOlsonDict;
__CFTimeZoneWinToOlsonDict = dict ? CFRetain(dict) : NULL;
CFRelease(oldDict);
}
__CFTimeZoneUnlockWinToOlson();
}
CFTimeZoneRef CFTimeZoneCreateWithWindowsName(CFAllocatorRef allocator, CFStringRef winName) {
if (!winName) return NULL;
CFDictionaryRef winToOlson = CFTimeZoneCopyWinToOlsonDictionary();
if (!winToOlson) return NULL;
CFStringRef olsonName = CFDictionaryGetValue(winToOlson, winName);
CFTimeZoneRef retval = NULL;
if (olsonName) {
retval = CFTimeZoneCreateWithName(allocator, olsonName, false);
}
CFRelease(winToOlson);
return retval;
}
#elif TARGET_OS_MAC
static void __InitTZStrings(void) {
static dispatch_once_t initOnce = 0;
dispatch_once(&initOnce, ^{
unsigned int major = 0, minor = 0, patch = 0;
CFDictionaryRef dict = _CFCopySystemVersionDictionary();
if (dict) {
CFStringRef version = CFDictionaryGetValue(dict, _kCFSystemVersionProductVersionKey);
if (version) {
const char *cStr = CFStringGetCStringPtr(version, kCFStringEncodingASCII);
if (cStr) {
if (sscanf(cStr, "%u.%u.%u", &major, &minor, &patch) != 3) {
major = 0;
minor = 0;
patch = 0;
}
}
}
CFRelease(dict);
}
// Timezone files moved in High Sierra(10.13)
if (major == 10 && minor < 13) {
// older versions
__tzZoneInfo = CFSTR(MACOS_TZDIR1);
__tzDir = MACOS_TZDIR1 "zone.tab";
} else {
__tzZoneInfo = CFSTR(MACOS_TZDIR2);
__tzDir = MACOS_TZDIR2 "zone.tab";
}
});
}
#elif TARGET_OS_ANDROID
// Nothing
#elif TARGET_OS_LINUX || TARGET_OS_BSD
static void __InitTZStrings(void) {
__tzZoneInfo = CFSTR(TZDIR);
__tzDir = TZDIR "zone.tab";
}
#else
#error Unknown or unspecified DEPLOYMENT_TARGET
#endif
static CFTimeZoneRef __CFTimeZoneCreateSystem(void) {
CFTimeZoneRef result = NULL;
CFStringRef name = NULL;
#if TARGET_OS_WIN32
TIME_ZONE_INFORMATION tzi = { 0 };
DWORD rval = GetTimeZoneInformation(&tzi);
if (rval != TIME_ZONE_ID_INVALID) {
LPWSTR standardName = (LPWSTR)&tzi.StandardName;
CFStringRef cfStandardName = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (UInt8 *)standardName, wcslen(standardName)*sizeof(WCHAR), kCFStringEncodingUTF16LE, false);
if (cfStandardName) {
CFDictionaryRef winToOlson = CFTimeZoneCopyWinToOlsonDictionary();
if (winToOlson) {
name = CFDictionaryGetValue(winToOlson, cfStandardName);
if (name) CFRetain(name);
CFRelease(winToOlson);
}
CFRelease(cfStandardName);
}
} else {
CFLog(kCFLogLevelError, CFSTR("Couldn't get time zone information error %d"), GetLastError());
}
#else
const char *tzenv;
int ret;
char linkbuf[CFMaxPathSize];
tzenv = __CFgetenv("TZFILE");
if (NULL != tzenv) {
CFStringRef name = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (uint8_t *)tzenv, strlen(tzenv), kCFStringEncodingUTF8, false);
result = CFTimeZoneCreateWithName(kCFAllocatorSystemDefault, name, false);
CFRelease(name);
if (result) return result;
}
tzenv = __CFgetenv("TZ");
if (NULL != tzenv) {
CFStringRef name = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (uint8_t *)tzenv, strlen(tzenv), kCFStringEncodingUTF8, false);
result = CFTimeZoneCreateWithName(kCFAllocatorSystemDefault, name, true);
CFRelease(name);
if (result) return result;
}
#if !TARGET_OS_ANDROID
if (!__tzZoneInfo) __InitTZStrings();
ret = readlink(TZDEFAULT, linkbuf, sizeof(linkbuf));
if (__tzZoneInfo && (0 < ret)) {
linkbuf[ret] = '\0';
const char *tzZoneInfo = CFStringGetCStringPtr(__tzZoneInfo, kCFStringEncodingASCII);
size_t zoneInfoDirLen = CFStringGetLength(__tzZoneInfo);
if (strncmp(linkbuf, tzZoneInfo, zoneInfoDirLen) == 0) {
name = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (uint8_t *)linkbuf + zoneInfoDirLen,
strlen(linkbuf) - zoneInfoDirLen, kCFStringEncodingUTF8, false);
} else {
name = CFStringCreateWithBytes(kCFAllocatorSystemDefault, (uint8_t *)linkbuf, strlen(linkbuf), kCFStringEncodingUTF8, false);
}
} else
#endif
{
// TODO: This can still fail on Linux if the time zone is not recognized by ICU later
// Try localtime
tzset();
time_t t = time(NULL);
struct tm lt = {0};
localtime_r(&t, <);
name = CFStringCreateWithCString(kCFAllocatorSystemDefault, lt.tm_zone, kCFStringEncodingUTF8);
}
#endif
if (name) {
result = CFTimeZoneCreateWithName(kCFAllocatorSystemDefault, name, false);
CFRelease(name);
if (result) return result;
}
return CFTimeZoneCreateWithTimeIntervalFromGMT(kCFAllocatorSystemDefault, 0.0);
}
CFTimeZoneRef CFTimeZoneCopySystem(void) {
CFTimeZoneRef tz;
__CFTimeZoneLockGlobal();
if (NULL == __CFTimeZoneSystem) {
__CFTimeZoneUnlockGlobal();
tz = __CFTimeZoneCreateSystem();
__CFTimeZoneLockGlobal();
if (NULL == __CFTimeZoneSystem) {
__CFTimeZoneSystem = tz;
} else {
if (tz) CFRelease(tz);
}
}
tz = __CFTimeZoneSystem ? (CFTimeZoneRef)CFRetain(__CFTimeZoneSystem) : NULL;
__CFTimeZoneUnlockGlobal();
return tz;
}
static CFIndex __noteCount = 0;
void CFTimeZoneResetSystem(void) {
__CFTimeZoneLockGlobal();
if (__CFTimeZoneDefault == __CFTimeZoneSystem) {
if (__CFTimeZoneDefault) CFRelease(__CFTimeZoneDefault);
__CFTimeZoneDefault = NULL;
}
CFTimeZoneRef tz = __CFTimeZoneSystem;
__CFTimeZoneSystem = NULL;
__CFTimeZoneUnlockGlobal();
if (tz) CFRelease(tz);
}
CFIndex _CFTimeZoneGetNoteCount(void) {
return __noteCount;
}
CFTimeZoneRef CFTimeZoneCopyDefault(void) {
CFTimeZoneRef tz;
__CFTimeZoneLockGlobal();
if (NULL == __CFTimeZoneDefault) {
__CFTimeZoneUnlockGlobal();
tz = CFTimeZoneCopySystem();
__CFTimeZoneLockGlobal();
if (NULL == __CFTimeZoneDefault) {
__CFTimeZoneDefault = tz;
} else {
if (tz) CFRelease(tz);
}
}
tz = __CFTimeZoneDefault ? (CFTimeZoneRef)CFRetain(__CFTimeZoneDefault) : NULL;
__CFTimeZoneUnlockGlobal();
return tz;
}
void CFTimeZoneSetDefault(CFTimeZoneRef tz) {
if (tz) __CFGenericValidateType(tz, CFTimeZoneGetTypeID());
__CFTimeZoneLockGlobal();
if (tz != __CFTimeZoneDefault) {
if (tz) CFRetain(tz);
if (__CFTimeZoneDefault) CFRelease(__CFTimeZoneDefault);
__CFTimeZoneDefault = tz;
}
__CFTimeZoneUnlockGlobal();
}
static CFDictionaryRef __CFTimeZoneCopyCompatibilityDictionary(void);
static Boolean __nameStringOK(CFStringRef name);
CFArrayRef CFTimeZoneCopyKnownNames(void) {
CFArrayRef tzs;
__CFTimeZoneLockGlobal();
if (NULL == __CFKnownTimeZoneList) {
CFMutableArrayRef list;
/* TimeZone information locate in the registry for Win32
* (Aleksey Dukhnyakov)
*/
#if TARGET_OS_WIN32
list = __CFCopyWindowsTimeZoneList();
#elif TARGET_OS_ANDROID
list = __CFCopyAndroidTimeZoneList();
#else
list = __CFCopyRecursiveDirectoryList();
#endif
// Remove undesirable ancient cruft
CFDictionaryRef dict = __CFTimeZoneCopyCompatibilityDictionary();
CFIndex idx;
for (idx = CFArrayGetCount(list); idx--; ) {
CFStringRef item = (CFStringRef)CFArrayGetValueAtIndex(list, idx);
if (CFDictionaryContainsKey(dict, item) || !__nameStringOK(item)) {
CFArrayRemoveValueAtIndex(list, idx);
}
}
__CFKnownTimeZoneList = CFArrayCreateCopy(kCFAllocatorSystemDefault, list);
CFRelease(list);
}
tzs = __CFKnownTimeZoneList ? (CFArrayRef)CFRetain(__CFKnownTimeZoneList) : NULL;
__CFTimeZoneUnlockGlobal();
return tzs;
}
/* The criteria here are sort of: coverage for the U.S. and Europe,
* large cities, abbreviation uniqueness, and perhaps a few others.