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#include "main.h"
#include "RFCDate.h"
#include <strsafe.h>
void MakeDateString(__time64_t convertTime, wchar_t *date_str, size_t len)
{
SYSTEMTIME sysTime = {0};
tm *newtime = _localtime64(&convertTime);
sysTime.wYear = newtime->tm_year + 1900;
sysTime.wMonth = newtime->tm_mon + 1;
sysTime.wDayOfWeek = newtime->tm_wday;
sysTime.wDay = newtime->tm_mday;
sysTime.wHour = newtime->tm_hour;
sysTime.wMinute = newtime->tm_min;
sysTime.wSecond = newtime->tm_sec;
GetDateFormat(LOCALE_USER_DEFAULT, DATE_SHORTDATE, &sysTime, NULL, date_str, (int)len);
}
void MakeRFCDateString(__time64_t convertTime, wchar_t *data_str, size_t len)
{
SYSTEMTIME sysTime = {0};
tm *newtime = _gmtime64(&convertTime);
sysTime.wYear = newtime->tm_year + 1900;
sysTime.wMonth = newtime->tm_mon + 1;
sysTime.wDayOfWeek = newtime->tm_wday;
sysTime.wDay = newtime->tm_mday;
sysTime.wHour = newtime->tm_hour;
sysTime.wMinute = newtime->tm_min;
sysTime.wSecond = newtime->tm_sec;
wchar_t rfcDate[64] = {0}, rfcTime[64] = {0};
GetDateFormat(MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT), 0, &sysTime, L"ddd',' d MMM yyyy ", rfcDate, 64);
GetTimeFormat(MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT), 0, &sysTime, L"HH':'mm':'ss 'GMT'", rfcTime, 64);
StringCchPrintf(data_str,len,L"%s%s",rfcDate,rfcTime);
}
static int getMonthOfYear(const wchar_t *str);
static int validateTime(struct tm *tmloc, int gmoffset);
static const wchar_t *getNextField(const wchar_t *pos);
static int getGMOffset(const wchar_t *str);
enum
{
DAY_OF_MONTH = 0,
MONTH_OF_YEAR,
YEAR,
TIME,
TIMEZONE,
DATE_END
};
__time64_t MakeRFCDate(const wchar_t *date)
{
__time64_t result = 0;
const wchar_t *pos = date;
tm tmloc = {0};
const wchar_t *strmin;
const wchar_t *strsec;
int gmoffset = 1;
int state = DAY_OF_MONTH;
tzset();
/* skip weekday if present */
while (pos && *pos && !iswdigit(*pos)) pos++;
do
{
switch (state)
{
case DAY_OF_MONTH:
tmloc.tm_mday = _wtoi(pos);
break;
case MONTH_OF_YEAR:
tmloc.tm_mon = getMonthOfYear(pos);
break;
case YEAR:
{
/* TODO: we're only accepting 4-digit dates...*/
const wchar_t *test = pos; int numDigits = 0;
while (iswdigit(*test) && *test) { test++; numDigits++; }
if (numDigits == 2) // let's hope we never have 2 digit years!
tmloc.tm_year = _wtoi(pos) + 100; // assume 2 digit years are 20xx
else
tmloc.tm_year = _wtoi(pos) - 1900;
}
break;
case TIME:
strmin = wcschr(pos, L':');
strsec = strmin ? wcschr(strmin + 1, L':') : 0;
tmloc.tm_hour = _wtoi(pos);
if (!strmin) return _time64(0);
tmloc.tm_min = _wtoi(strmin + 1);
if (!strsec) return _time64(0);
tmloc.tm_sec = _wtoi(strsec + 1);
break;
case TIMEZONE:
gmoffset = getGMOffset(pos);
break;
case DATE_END:
pos = 0;
break;
}
state++;
}
while ((pos = getNextField(pos)));
tmloc.tm_isdst = 0; //_daylight;
if (validateTime(&tmloc, gmoffset))
{
result = _mktime64(&tmloc) - _timezone;
//if (_daylight)
}
return result;
}
const wchar_t *getNextField(const wchar_t *pos)
{
if (!pos)
return 0;
while (pos && *pos && !iswspace(*pos)) pos++;
while (pos && *pos && iswspace(*pos)) pos++;
return ((pos && *pos) ? pos : 0);
}
int validateTime(struct tm *tmloc, int gmoffset)
{
int result = 1;
if (tmloc->tm_mday < 1 || tmloc->tm_mday > 31 ||
tmloc->tm_mon < 0 || tmloc->tm_mon > 11 ||
tmloc->tm_year < 0 || tmloc->tm_year > 2000 ||
tmloc->tm_hour < 0 || tmloc->tm_hour > 23 ||
tmloc->tm_min < 0 || tmloc->tm_min > 59 ||
tmloc->tm_sec < 0 || tmloc->tm_sec > 59 ||
gmoffset == 1)
result = 0;
return result;
}
int getMonthOfYear(const wchar_t *str)
{
int mon = -1;
/* This is not the most efficient way to determine
the month (we could use integer comparisons, for instance)
but I don't think this will be a performance bottleneck :)
*/
if (!wcsnicmp(str, L"Jan", 3))
mon = 0;
else if (!wcsnicmp(str, L"Feb", 3))
mon = 1;
else if (!wcsnicmp(str, L"Mar", 3))
mon = 2;
else if (!wcsnicmp(str, L"Apr", 3))
mon = 3;
else if (!wcsnicmp(str, L"May", 3))
mon = 4;
else if (!wcsnicmp(str, L"Jun", 3))
mon = 5;
else if (!wcsnicmp(str, L"Jul", 3))
mon = 6;
else if (!wcsnicmp(str, L"Aug", 3))
mon = 7;
else if (!wcsnicmp(str, L"Sep", 3))
mon = 8;
else if (!wcsnicmp(str, L"Oct", 3))
mon = 9;
else if (!wcsnicmp(str, L"Nov", 3))
mon = 10;
else if (!wcsnicmp(str, L"Dec", 3))
mon = 11;
return mon;
}
int getGMOffset(const wchar_t *str)
{
int secs = 0;
/* See note in getMonthOfYear() */
if (!wcsnicmp(str, L"UT", 2) || !wcsnicmp(str, L"GMT", 3))
secs = 0;
else if (!wcsnicmp(str, L"EDT", 3))
secs = -4 * 3600;
else if (!wcsnicmp(str, L"PST", 3))
secs = -8 * 3600;
else if (!wcsnicmp(str, L"EST", 3) || !wcsnicmp(str, L"CDT", 3))
secs = -5 * 3600;
else if (!wcsnicmp(str, L"MST", 3) || !wcsnicmp(str, L"PDT", 3))
secs = -7 * 3600;
else if (!wcsnicmp(str, L"CST", 3) || !wcsnicmp(str, L"MDT", 3))
secs = -6 * 3600;
else if ( (str[0] == L'+' || str[0] == L'-') &&
iswdigit(str[1]) && iswdigit(str[2]) &&
iswdigit(str[3]) && iswdigit(str[4]))
{
secs = 3600 * (10 * (str[1] - 48) + str[2] - 48);
secs += 60 * (10 * (str[3] - 48) + str[4] - 48);
if (str[0] == L'-')
secs = -secs;
}
else
secs = 1;
return secs;
}
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