int
StringUtils_digitToInt(char digit)
{
if (StringUtils_isDigit(digit)) {
return (digit - 48);
}
else
return -1;
}
uint64_t
Conversions_generalizedTimeToMsTime(const char* gtString)
{
int gtStringLen = strlen(gtString);
if (gtStringLen < 14) return -1;
int year = StringUtils_digitsToInt(gtString, 4);
if (year < 0) return -1;
int month = StringUtils_digitsToInt(gtString + 4, 2);
if (month < 0) return -1;
int day = StringUtils_digitsToInt(gtString + 6, 2);
if (day < 0) return -1;
int hour = StringUtils_digitsToInt(gtString + 8, 2);
if (hour < 0) return -1;
int min = StringUtils_digitsToInt(gtString + 10, 2);
if (min < 0) return -1;
int seconds = StringUtils_digitsToInt(gtString + 12, 2);
if (seconds < 0) return -1;
struct tm tmTime;
tmTime.tm_year = year - 1900;
tmTime.tm_mon = month - 1;
tmTime.tm_mday = day;
tmTime.tm_hour = hour;
tmTime.tm_min = min;
tmTime.tm_sec = seconds;
int msOffset = 0;
const char* parsePos = gtString + 14;
/* parse optional fraction of second field */
if (*(parsePos) == '.') {
parsePos++;
const char* fractionOfSecondStart = parsePos;
int fractionOfSecondLen = 0;
int secondValue = 1;
while (StringUtils_isDigit(fractionOfSecondStart[fractionOfSecondLen])) {
fractionOfSecondLen++;
secondValue = secondValue * 10;
}
if (fractionOfSecondLen > 0) {
int fractionOfSecond = StringUtils_digitsToInt(fractionOfSecondStart, fractionOfSecondLen);
msOffset = (fractionOfSecond * 1000) / secondValue;
}
parsePos += fractionOfSecondLen;
}
time_t t = 0;
switch (*parsePos) {
case 0: /* treat time as localtime */
t = mktime(&tmTime);
break;
case 'Z': /* treat time as GMT(UTC) time */
t = timegm(&tmTime);
break;
case '+': /* subtract offset */
{
t = timegm(&tmTime);
int secondsOffset = getSecondsOffset(parsePos + 1);
t = t - secondsOffset;
}
break;
case '-': /* add offset */
{
t = timegm(&tmTime);
int secondsOffset = getSecondsOffset(parsePos + 1);
t = t + secondsOffset;
}
break;
default:
return -1;
}
uint64_t msTime = t * 1000;
msTime += msOffset;
return msTime;
}