Diff: Time.cpp

Revision:

5:fde01b92a384

Parent:

4:c84afcfbac84

Child:

7:0c7207d674d3

--- a/Time.cpp	Fri Jan 21 23:05:05 2011 +0000
+++ b/Time.cpp	Mon Jan 24 22:01:44 2011 +0000
@@ -6,7 +6,7 @@
 using namespace std;
 
 class TimeZoneEntry {
-    public:
+public:
     TimeStamp *_from;
     TimeStamp *_to;
     int _offset;
@@ -15,8 +15,7 @@
 
 TimeZoneEntry* Time::_timeZoneEntries=NULL;
 
-bool TimeStamp::isSame(TimeStamp* ts)
-{
+bool TimeStamp::isSame(TimeStamp* ts) {
     if (ts->getYear()!=getYear())
         return false;
     if (ts->getMonth()!=getMonth())
@@ -29,8 +28,7 @@
         return false;
     return true;
 }
-bool TimeStamp::isBefore(TimeStamp* ts)
-{
+bool TimeStamp::isBefore(TimeStamp* ts) {
     if (getYear()<ts->getYear())
         return true;
     if (getYear()>ts->getYear())
@@ -53,11 +51,10 @@
 
     if (getSecond()<ts->getSecond())
         return true;
-    return false;        
+    return false;
 }
-bool TimeStamp::isAfter(TimeStamp* ts)
-{
-    return ts->isBefore(this);        
+bool TimeStamp::isAfter(TimeStamp* ts) {
+    return ts->isBefore(this);
 }
 
 Time::Time() {
@@ -82,68 +79,72 @@
         printf("error while reading timezone file [timezone.csv]\n");
         return;
     }
-    
+
     TimeZoneEntry *current=NULL;
 
 
     char tmp[128]; // enough for a single line
     while (fgets(tmp,sizeof(tmp),fp)!=0) {
-        int fyear, fmon, fday, fhour, fmin, fsec;
-        int tyear, tmon, tday, thour, tmin, tsec;
-        int offset;
-        int r=sscanf(tmp,"%4d-%2d-%2dT%2d:%2d:%2dZ,%4d-%2d-%2dT%2d:%2d:%2dZ,%d",
-                     &fyear, &fmon, &fday, &fhour, &fmin, &fsec,
-                     &tyear, &tmon, &tday, &thour, &tmin, &tsec,
-                     &offset
-                    );
-        if (13!=r)
-            continue;
-        if (tyear<currentYear || fyear>currentYear+4)
-            continue;
-            
-        TimeStamp *from=new TimeStamp(fyear, fmon, fday, fhour, fmin, fsec,0);
-        TimeStamp *to=new TimeStamp(tyear, tmon, tday, thour, tmin, tsec,0);
-        TimeZoneEntry *tze=new TimeZoneEntry();
-        tze->_from=from;
-        tze->_to=to;
-        tze->_offset=offset;
-        tze->next=NULL;
-        
-        if (NULL==current)
-        {
-            current=tze;
-            _timeZoneEntries=tze;
-        }
-        else
-        {
-            current->next=tze;
-            current=tze;
+        if (tmp[0]!='#') {
+            int fyear, fmon, fday, fhour, fmin, fsec;
+            int tyear, tmon, tday, thour, tmin, tsec;
+            int offset;
+            int r=sscanf(tmp,"%4d-%2d-%2dT%2d:%2d:%2dZ,%4d-%2d-%2dT%2d:%2d:%2dZ,%d",
+                         &fyear, &fmon, &fday, &fhour, &fmin, &fsec,
+                         &tyear, &tmon, &tday, &thour, &tmin, &tsec,
+                         &offset
+                        );
+            if (13!=r)
+                continue;
+            // when we have no current time, so the year is 1970 and we read everything
+            // otherwise skip everything more than 4 years in advance to save memory
+            if (currentYear!=1970 && (tyear<currentYear || fyear>currentYear+4)) {
+                continue;
+            }
+
+            TimeStamp *from=new TimeStamp(fyear, fmon, fday, fhour, fmin, fsec,0);
+            TimeStamp *to=new TimeStamp(tyear, tmon, tday, thour, tmin, tsec,0);
+            TimeZoneEntry *tze=new TimeZoneEntry();
+            tze->_from=from;
+            tze->_to=to;
+            tze->_offset=offset;
+            tze->next=NULL;
+
+            if (NULL==current) {
+                current=tze;
+                _timeZoneEntries=tze;
+            } else {
+                current->next=tze;
+                current=tze;
+            }
         }
     }
-    printf("closing time zone file\n");
+//    printf("closing time zone file\n");
     fclose(fp);
 }
 
 Time::~Time() {
 }
 
+int Time::getTimeOffset(TimeStamp* ts) {
+    TimeZoneEntry *current=_timeZoneEntries;
+
+    while (current!=NULL) {
+        if (current->_from->isBefore(ts) && current->_to->isAfter(ts)) {
+            return current->_offset;
+        }
+        current=current->next;
+    }
+    return 0;
+}
+
 TimeStamp* Time::getTime() {
     time_t rawtime;
     time ( &rawtime );
     TimeStamp *ts=new TimeStamp(rawtime);
-    
-    TimeZoneEntry *current=_timeZoneEntries;
-    
-    while (current!=NULL)
-    {
-        if (current->_from->isBefore(ts) && current->_to->isAfter(ts))
-        {
-            rawtime+=current->_offset;
-            ts->updateTime(rawtime);
-            break;
-        }
-        current=current->next;
-    }
-    
+
+    rawtime+=getTimeOffset(ts);
+    ts->updateTime(rawtime);
+
     return ts;
 }