1 files changed, 64 insertions, 1 deletions
diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
index 20928e1595..805e6b4e20 100644
--- a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
+++ b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
@@ -2,7 +2,7 @@
   C Run-Time Libraries (CRT) Time Management Routines Wrapper Implementation
   for OpenSSL-based Cryptographic Library (used in DXE & RUNTIME).
 
-Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -22,6 +22,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 //
 
 #define IsLeap(y)   (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
+#define SECSPERMIN  (60)
 #define SECSPERHOUR (60 * 60)
 #define SECSPERDAY  (24 * SECSPERHOUR)
 
@@ -100,3 +101,65 @@ time_t time (time_t *timer)
 
   return *timer;
 }
+
+//
+// Convert a time value from type time_t to struct tm.
+//
+struct tm * gmtime (const time_t *timer)
+{
+  struct tm  *GmTime;
+  UINT16     DayNo;
+  UINT16     DayRemainder;
+  time_t     Year;
+  time_t     YearNo;
+  UINT16     TotalDays;
+  UINT16     MonthNo;
+
+  if (timer == NULL) {
+    return NULL;
+  }
+
+  GmTime = malloc (sizeof (struct tm));
+  if (GmTime == NULL) {
+    return NULL;
+  }
+
+  ZeroMem ((VOID *) GmTime, (UINTN) sizeof (struct tm));
+
+  DayNo        = (UINT16) (*timer / SECSPERDAY);
+  DayRemainder = (UINT16) (*timer % SECSPERDAY);
+
+  GmTime->tm_sec  = (int) (DayRemainder % SECSPERMIN);
+  GmTime->tm_min  = (int) ((DayRemainder % SECSPERHOUR) / SECSPERMIN);
+  GmTime->tm_hour = (int) (DayRemainder / SECSPERHOUR);
+  GmTime->tm_wday = (int) ((DayNo + 4) % 7);
+
+  for (Year = 1970, YearNo = 0; DayNo > 0; Year++) {
+    TotalDays = (UINT16) (IsLeap (Year) ? 366 : 365);
+    if (DayNo >= TotalDays) {
+      DayNo = (UINT16) (DayNo - TotalDays);
+      YearNo++;
+    } else {
+      break;
+    }
+  }
+
+  GmTime->tm_year = (int) (YearNo + (1970 - 1900));
+  GmTime->tm_yday = (int) DayNo;
+
+  for (MonthNo = 12; MonthNo > 1; MonthNo--) {
+    if (DayNo > CumulativeDays[IsLeap(Year)][MonthNo]) {
+      DayNo = (UINT16) (DayNo - (UINT16) (CumulativeDays[IsLeap(Year)][MonthNo]));
+      break;
+    }
+  }
+
+  GmTime->tm_mon  = (int) MonthNo;
+  GmTime->tm_mday = (int) DayNo;
+
+  GmTime->tm_isdst  = 0;
+  GmTime->tm_gmtoff = 0;
+  GmTime->tm_zone   = NULL;
+
+  return GmTime;
+}