aboutsummaryrefslogtreecommitdiff
path: root/CPP/Windows/TimeUtils.cpp
blob: 77d2c51029302f2cebdd0448d1088697673264be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
// Windows/TimeUtils.cpp

#include "StdAfx.h"

#ifndef _WIN32
#include <sys/time.h>
#endif

#include "Defs.h"
#include "TimeUtils.h"

namespace NWindows {
namespace NTime {

static const UInt32 kNumTimeQuantumsInSecond = 10000000;
static const UInt32 kFileTimeStartYear = 1601;
#if !defined(_WIN32) || defined(UNDER_CE)
static const UInt32 kDosTimeStartYear = 1980;
#endif
static const UInt32 kUnixTimeStartYear = 1970;
static const UInt64 kUnixTimeOffset =
    (UInt64)60 * 60 * 24 * (89 + 365 * (kUnixTimeStartYear - kFileTimeStartYear));
static const UInt64 kNumSecondsInFileTime = (UInt64)(Int64)-1 / kNumTimeQuantumsInSecond;

bool DosTime_To_FileTime(UInt32 dosTime, FILETIME &ft) throw()
{
  #if defined(_WIN32) && !defined(UNDER_CE)
  return BOOLToBool(::DosDateTimeToFileTime((UInt16)(dosTime >> 16), (UInt16)(dosTime & 0xFFFF), &ft));
  #else
  ft.dwLowDateTime = 0;
  ft.dwHighDateTime = 0;
  UInt64 res;
  if (!GetSecondsSince1601(kDosTimeStartYear + (dosTime >> 25), (dosTime >> 21) & 0xF, (dosTime >> 16) & 0x1F,
      (dosTime >> 11) & 0x1F, (dosTime >> 5) & 0x3F, (dosTime & 0x1F) * 2, res))
    return false;
  res *= kNumTimeQuantumsInSecond;
  ft.dwLowDateTime = (UInt32)res;
  ft.dwHighDateTime = (UInt32)(res >> 32);
  return true;
  #endif
}

static const UInt32 kHighDosTime = 0xFF9FBF7D;
static const UInt32 kLowDosTime = 0x210000;

bool FileTime_To_DosTime(const FILETIME &ft, UInt32 &dosTime) throw()
{
  #if defined(_WIN32) && !defined(UNDER_CE)

  WORD datePart, timePart;
  if (!::FileTimeToDosDateTime(&ft, &datePart, &timePart))
  {
    dosTime = (ft.dwHighDateTime >= 0x01C00000) ? kHighDosTime : kLowDosTime;
    return false;
  }
  dosTime = (((UInt32)datePart) << 16) + timePart;

  #else

#define PERIOD_4 (4 * 365 + 1)
#define PERIOD_100 (PERIOD_4 * 25 - 1)
#define PERIOD_400 (PERIOD_100 * 4 + 1)

  unsigned year, mon, day, hour, min, sec;
  UInt64 v64 = ft.dwLowDateTime | ((UInt64)ft.dwHighDateTime << 32);
  Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  unsigned temp;
  UInt32 v;
  v64 += (kNumTimeQuantumsInSecond * 2 - 1);
  v64 /= kNumTimeQuantumsInSecond;
  sec = (unsigned)(v64 % 60);
  v64 /= 60;
  min = (unsigned)(v64 % 60);
  v64 /= 60;
  hour = (unsigned)(v64 % 24);
  v64 /= 24;

  v = (UInt32)v64;

  year = (unsigned)(kFileTimeStartYear + v / PERIOD_400 * 400);
  v %= PERIOD_400;

  temp = (unsigned)(v / PERIOD_100);
  if (temp == 4)
    temp = 3;
  year += temp * 100;
  v -= temp * PERIOD_100;

  temp = v / PERIOD_4;
  if (temp == 25)
    temp = 24;
  year += temp * 4;
  v -= temp * PERIOD_4;

  temp = v / 365;
  if (temp == 4)
    temp = 3;
  year += temp;
  v -= temp * 365;

  if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
    ms[1] = 29;
  for (mon = 1; mon <= 12; mon++)
  {
    unsigned s = ms[mon - 1];
    if (v < s)
      break;
    v -= s;
  }
  day = (unsigned)v + 1;

  dosTime = kLowDosTime;
  if (year < kDosTimeStartYear)
    return false;
  year -= kDosTimeStartYear;
  dosTime = kHighDosTime;
  if (year >= 128)
    return false;
  dosTime = (year << 25) | (mon << 21) | (day << 16) | (hour << 11) | (min << 5) | (sec >> 1);
  #endif
  return true;
}


bool UtcFileTime_To_LocalDosTime(const FILETIME &utc, UInt32 &dosTime) throw()
{
  FILETIME loc = { 0, 0 };
  const UInt64 u1 = FILETIME_To_UInt64(utc);
  const UInt64 kDelta = ((UInt64)1 << 41); // it's larger than quantums in 1 sec.
  if (u1 >= kDelta)
  {
    if (!FileTimeToLocalFileTime(&utc, &loc))
      loc = utc;
    else
    {
      const UInt64 u2 = FILETIME_To_UInt64(loc);
      const UInt64 delta = u1 < u2 ? (u2 - u1) : (u1 - u2);
      if (delta > kDelta) // if FileTimeToLocalFileTime() overflow, we use UTC time
        loc = utc;
    }
  }
  return FileTime_To_DosTime(loc, dosTime);
}

UInt64 UnixTime_To_FileTime64(UInt32 unixTime) throw()
{
  return (kUnixTimeOffset + (UInt64)unixTime) * kNumTimeQuantumsInSecond;
}

void UnixTime_To_FileTime(UInt32 unixTime, FILETIME &ft) throw()
{
  const UInt64 v = UnixTime_To_FileTime64(unixTime);
  ft.dwLowDateTime = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
}

UInt64 UnixTime64_To_FileTime64(Int64 unixTime) throw()
{
  return (UInt64)((Int64)kUnixTimeOffset + unixTime) * kNumTimeQuantumsInSecond;
}


bool UnixTime64_To_FileTime64(Int64 unixTime, UInt64 &fileTime) throw()
{
  if (unixTime > (Int64)(kNumSecondsInFileTime - kUnixTimeOffset))
  {
    fileTime = (UInt64)(Int64)-1;
    return false;
  }
  if (unixTime < -(Int64)kUnixTimeOffset)
  {
    fileTime = 0;
    return false;
  }
  fileTime = UnixTime64_To_FileTime64(unixTime);
  return true;
}


bool UnixTime64_To_FileTime(Int64 unixTime, FILETIME &ft) throw()
{
  UInt64 v;
  const bool res = UnixTime64_To_FileTime64(unixTime, v);
  ft.dwLowDateTime = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
  return res;
}


Int64 FileTime_To_UnixTime64(const FILETIME &ft) throw()
{
  const UInt64 winTime = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
  return (Int64)(winTime / kNumTimeQuantumsInSecond) - (Int64)kUnixTimeOffset;
}

Int64 FileTime_To_UnixTime64_and_Quantums(const FILETIME &ft, UInt32 &quantums) throw()
{
  const UInt64 winTime = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
  quantums = (UInt32)(winTime % kNumTimeQuantumsInSecond);
  return (Int64)(winTime / kNumTimeQuantumsInSecond) - (Int64)kUnixTimeOffset;
}

bool FileTime_To_UnixTime(const FILETIME &ft, UInt32 &unixTime) throw()
{
  UInt64 winTime = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
  winTime /= kNumTimeQuantumsInSecond;
  if (winTime < kUnixTimeOffset)
  {
    unixTime = 0;
    return false;
  }
  winTime -= kUnixTimeOffset;
  if (winTime > (UInt32)0xFFFFFFFF)
  {
    unixTime = (UInt32)0xFFFFFFFF;
    return false;
  }
  unixTime = (UInt32)winTime;
  return true;
}

bool GetSecondsSince1601(unsigned year, unsigned month, unsigned day,
  unsigned hour, unsigned min, unsigned sec, UInt64 &resSeconds) throw()
{
  resSeconds = 0;
  if (year < kFileTimeStartYear || year >= 10000 || month < 1 || month > 12 ||
      day < 1 || day > 31 || hour > 23 || min > 59 || sec > 59)
    return false;
  UInt32 numYears = year - kFileTimeStartYear;
  UInt32 numDays = numYears * 365 + numYears / 4 - numYears / 100 + numYears / 400;
  Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
    ms[1] = 29;
  month--;
  for (unsigned i = 0; i < month; i++)
    numDays += ms[i];
  numDays += day - 1;
  resSeconds = ((UInt64)(numDays * 24 + hour) * 60 + min) * 60 + sec;
  return true;
}


void GetCurUtc_FiTime(CFiTime &ft) throw()
{
 #ifdef _WIN32

  // Both variants provide same low resolution on WinXP: about 15 ms.
  // But GetSystemTimeAsFileTime is much faster.
  #ifdef UNDER_CE
  SYSTEMTIME st;
  GetSystemTime(&st);
  SystemTimeToFileTime(&st, &ft);
  #else
  GetSystemTimeAsFileTime(&ft);
  #endif

 #else
  
  FiTime_Clear(ft);
  struct timeval now;
  if (gettimeofday(&now, 0 ) == 0)
  {
    ft.tv_sec = now.tv_sec;
    ft.tv_nsec = now.tv_usec * 1000;
  }

 #endif
}

#ifndef _WIN32
void GetCurUtcFileTime(FILETIME &ft) throw()
{
  UInt64 v = 0;
  struct timeval now;
  if (gettimeofday(&now, 0 ) == 0)
  {
    v = ((UInt64)now.tv_sec + kUnixTimeOffset) *
      kNumTimeQuantumsInSecond + (UInt64)now.tv_usec * 10;
  }
  ft.dwLowDateTime  = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
}
#endif


}}


#ifdef _WIN32

/*
void FiTime_Normalize_With_Prec(CFiTime &ft, unsigned prec)
{
  if (prec == k_PropVar_TimePrec_0
      || prec == k_PropVar_TimePrec_HighPrec
      || prec >= k_PropVar_TimePrec_100ns)
    return;
  UInt64 v = (((UInt64)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;

  int numDigits = (int)prec - (int)k_PropVar_TimePrec_Base;
  UInt32 d;
  if (prec == k_PropVar_TimePrec_DOS)
  {
    // we round up as windows DosDateTimeToFileTime()
    v += NWindows::NTime::kNumTimeQuantumsInSecond * 2 - 1;
    d = NWindows::NTime::kNumTimeQuantumsInSecond * 2;
  }
  else
  {
    if (prec == k_PropVar_TimePrec_Unix)
      numDigits = 0;
    else if (numDigits < 0)
      return;
    d = 1;
    for (unsigned k = numDigits; k < 7; k++)
      d *= 10;
  }
  v /= d;
  v *= d;
  ft.dwLowDateTime = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
}
*/

#else

/*
void FiTime_Normalize_With_Prec(CFiTime &ft, unsigned prec)
{
  if (prec >= k_PropVar_TimePrec_1ns
      || prec == k_PropVar_TimePrec_HighPrec)
    return;

  int numDigits = (int)prec - (int)k_PropVar_TimePrec_Base;
  UInt32 d;
  if (prec == k_PropVar_TimePrec_Unix ||
      prec == (int)k_PropVar_TimePrec_Base)
  {
    ft.tv_nsec = 0;
    return;
  }
  if (prec == k_PropVar_TimePrec_DOS)
  {
    // we round up as windows DosDateTimeToFileTime()
    const unsigned sec1 = (ft.tv_sec & 1);
    if (ft.tv_nsec == 0 && sec1 == 0)
      return;
    ft.tv_nsec = 0;
    ft.tv_sec += 2 - sec1;
    return;
  }
  {
    if (prec == k_PropVar_TimePrec_0
        || numDigits < 0)
      numDigits = 7;
    d = 1;
    for (unsigned k = numDigits; k < 9; k++)
      d *= 10;
    ft.tv_nsec /= d;
    ft.tv_nsec *= d;
  }
}
*/

int Compare_FiTime(const CFiTime *a1, const CFiTime *a2)
{
  if (a1->tv_sec < a2->tv_sec) return -1;
  if (a1->tv_sec > a2->tv_sec) return 1;
  if (a1->tv_nsec < a2->tv_nsec) return -1;
  if (a1->tv_nsec > a2->tv_nsec) return 1;
  return 0;
}

bool FILETIME_To_timespec(const FILETIME &ft, timespec &ts)
{
  UInt32 quantums;
  const Int64 sec = NWindows::NTime::FileTime_To_UnixTime64_and_Quantums(ft, quantums);
  // time_t is long
  const time_t sec2 = (time_t)sec;
  if (sec2 == sec)
  {
    ts.tv_sec = sec2;
    ts.tv_nsec = (long)(quantums * 100);
    return true;
  }
  return false;
}

void FiTime_To_FILETIME_ns100(const CFiTime &ts, FILETIME &ft, unsigned &ns100)
{
  const UInt64 v = NWindows::NTime::UnixTime64_To_FileTime64(ts.tv_sec) + ((UInt64)ts.tv_nsec / 100);
  ns100 = (unsigned)((UInt64)ts.tv_nsec % 100);
  ft.dwLowDateTime = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
}

void FiTime_To_FILETIME(const CFiTime &ts, FILETIME &ft)
{
  const UInt64 v = NWindows::NTime::UnixTime64_To_FileTime64(ts.tv_sec) + ((UInt64)ts.tv_nsec / 100);
  ft.dwLowDateTime = (DWORD)v;
  ft.dwHighDateTime = (DWORD)(v >> 32);
}

#endif