CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c

   1 /** @file
   2   C Run-Time Libraries (CRT) Time Management Routines Wrapper Implementation
   3   for OpenSSL-based Cryptographic Library (used in DXE & RUNTIME).
   4
   5 Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Uefi.h>
  11 #include <CrtLibSupport.h>
  12 #include <Library/UefiRuntimeServicesTableLib.h>
  13
  14 //
  15 // -- Time Management Routines --
  16 //
  17
  18 #define IsLeap(y)   (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  19 #define SECSPERMIN  (60)
  20 #define SECSPERHOUR (60 * 60)
  21 #define SECSPERDAY  (24 * SECSPERHOUR)
  22
  23 //
  24 //  The arrays give the cumulative number of days up to the first of the
  25 //  month number used as the index (1 -> 12) for regular and leap years.
  26 //  The value at index 13 is for the whole year.
  27 //
  28 UINTN CumulativeDays[2][14] = {
  29   {
  30     0,
  31     0,
  32     31,
  33     31 + 28,
  34     31 + 28 + 31,
  35     31 + 28 + 31 + 30,
  36     31 + 28 + 31 + 30 + 31,
  37     31 + 28 + 31 + 30 + 31 + 30,
  38     31 + 28 + 31 + 30 + 31 + 30 + 31,
  39     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
  40     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
  41     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
  42     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
  43     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
  44   },
  45   {
  46     0,
  47     0,
  48     31,
  49     31 + 29,
  50     31 + 29 + 31,
  51     31 + 29 + 31 + 30,
  52     31 + 29 + 31 + 30 + 31,
  53     31 + 29 + 31 + 30 + 31 + 30,
  54     31 + 29 + 31 + 30 + 31 + 30 + 31,
  55     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
  56     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
  57     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
  58     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
  59     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
  60   }
  61 };
  62
  63 /* Get the system time as seconds elapsed since midnight, January 1, 1970. */
  64 //INTN time(
  65 //  INTN *timer
  66 //  )
  67 time_t time (time_t *timer)
  68 {
  69   EFI_STATUS  Status;
  70   EFI_TIME    Time;
  71   time_t      CalTime;
  72   UINTN       Year;
  73
  74   //
  75   // Get the current time and date information
  76   //
  77   Status = gRT->GetTime (&Time, NULL);
  78   if (EFI_ERROR (Status) || (Time.Year < 1970)) {
  79     return 0;
  80   }
  81
  82   //
  83   // Years Handling
  84   // UTime should now be set to 00:00:00 on Jan 1 of the current year.
  85   //
  86   for (Year = 1970, CalTime = 0; Year != Time.Year; Year++) {
  87     CalTime = CalTime + (time_t)(CumulativeDays[IsLeap(Year)][13] * SECSPERDAY);
  88   }
  89
  90   //
  91   // Add in number of seconds for current Month, Day, Hour, Minute, Seconds, and TimeZone adjustment
  92   //
  93   CalTime = CalTime +
  94             (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +
  95             (time_t)(CumulativeDays[IsLeap(Time.Year)][Time.Month] * SECSPERDAY) +
  96             (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) +
  97             (time_t)(Time.Hour * SECSPERHOUR) +
  98             (time_t)(Time.Minute * 60) +
  99             (time_t)Time.Second;
 100
 101   if (timer != NULL) {
 102     *timer = CalTime;
 103   }
 104
 105   return CalTime;
 106 }
 107
 108 //
 109 // Convert a time value from type time_t to struct tm.
 110 //
 111 struct tm * gmtime (const time_t *timer)
 112 {
 113   struct tm  *GmTime;
 114   UINT16     DayNo;
 115   UINT16     DayRemainder;
 116   time_t     Year;
 117   time_t     YearNo;
 118   UINT16     TotalDays;
 119   UINT16     MonthNo;
 120
 121   if (timer == NULL) {
 122     return NULL;
 123   }
 124
 125   GmTime = malloc (sizeof (struct tm));
 126   if (GmTime == NULL) {
 127     return NULL;
 128   }
 129
 130   ZeroMem ((VOID *) GmTime, (UINTN) sizeof (struct tm));
 131
 132   DayNo        = (UINT16) (*timer / SECSPERDAY);
 133   DayRemainder = (UINT16) (*timer % SECSPERDAY);
 134
 135   GmTime->tm_sec  = (int) (DayRemainder % SECSPERMIN);
 136   GmTime->tm_min  = (int) ((DayRemainder % SECSPERHOUR) / SECSPERMIN);
 137   GmTime->tm_hour = (int) (DayRemainder / SECSPERHOUR);
 138   GmTime->tm_wday = (int) ((DayNo + 4) % 7);
 139
 140   for (Year = 1970, YearNo = 0; DayNo > 0; Year++) {
 141     TotalDays = (UINT16) (IsLeap (Year) ? 366 : 365);
 142     if (DayNo >= TotalDays) {
 143       DayNo = (UINT16) (DayNo - TotalDays);
 144       YearNo++;
 145     } else {
 146       break;
 147     }
 148   }
 149
 150   GmTime->tm_year = (int) (YearNo + (1970 - 1900));
 151   GmTime->tm_yday = (int) DayNo;
 152
 153   for (MonthNo = 12; MonthNo > 1; MonthNo--) {
 154     if (DayNo >= CumulativeDays[IsLeap(Year)][MonthNo]) {
 155       DayNo = (UINT16) (DayNo - (UINT16) (CumulativeDays[IsLeap(Year)][MonthNo]));
 156       break;
 157     }
 158   }
 159
 160   GmTime->tm_mon  = (int) MonthNo - 1;
 161   GmTime->tm_mday = (int) DayNo + 1;
 162
 163   GmTime->tm_isdst  = 0;
 164   GmTime->tm_gmtoff = 0;
 165   GmTime->tm_zone   = NULL;
 166
 167   return GmTime;
 168 }