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//========================================================================
//
// DateInfo.cc
//
// Copyright (C) 2008, 2018, 2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2015 André Guerreiro <aguerreiro1985@gmail.com>
// Copyright (C) 2015 André Esser <bepandre@hotmail.com>
// Copyright (C) 2016, 2018 Adrian Johnson <ajohnson@redneon.com>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
//========================================================================
//
// Based on code from pdfinfo.cc
//
// Copyright 1998-2003 Glyph & Cog, LLC
//
//========================================================================
#include <config.h>
#include "glibc.h"
#include "DateInfo.h"
#include <cstdio>
#include <cstring>
/* See PDF Reference 1.3, Section 3.8.2 for PDF Date representation */
bool parseDateString(const char *dateString, int *year, int *month, int *day, int *hour, int *minute, int *second, char *tz, int *tzHour, int *tzMinute)
{
if ( dateString == nullptr ) return false;
if ( strlen(dateString) < 2 ) return false;
if ( dateString[0] == 'D' && dateString[1] == ':' )
dateString += 2;
*month = 1;
*day = 1;
*hour = 0;
*minute = 0;
*second = 0;
*tz = 0x00;
*tzHour = 0;
*tzMinute = 0;
if ( sscanf( dateString,
"%4d%2d%2d%2d%2d%2d%c%2d%*c%2d",
year, month, day, hour, minute, second,
tz, tzHour, tzMinute ) > 0 ) {
/* Workaround for y2k bug in Distiller 3 stolen from gpdf, hoping that it won't
* be used after y2.2k */
if ( *year < 1930 && strlen (dateString) > 14)
{
int century, years_since_1900;
if ( sscanf( dateString,
"%2d%3d%2d%2d%2d%2d%2d",
¢ury, &years_since_1900, month, day, hour, minute, second) == 7 )
{
*year = century * 100 + years_since_1900;
}
else
{
return false;
}
}
if (*year <= 0) return false;
return true;
}
return false;
}
GooString *timeToDateString(const time_t *timeA)
{
const time_t timet = timeA ? *timeA : time(nullptr);
struct tm localtime_tm;
localtime_r (&timet, &localtime_tm);
char buf[50];
strftime (buf, sizeof(buf), "D:%Y%m%d%H%M%S", &localtime_tm);
GooString *dateString = new GooString(buf);
// strftime "%z" does not work on windows (it prints zone name, not offset)
// calculate time zone offset by comparing local and gmtime time_t value for same
// time.
const time_t timeg = timegm(&localtime_tm);
const time_t offset = difftime(timeg, timet); // find time zone offset in seconds
if (offset > 0) {
dateString->appendf("+{0:02d}'{1:02d}", offset/3600, (offset%3600)/60);
} else if (offset < 0) {
dateString->appendf("-{0:02d}'{1:02d}", -offset/3600, (-offset%3600)/60);
} else {
dateString->append("Z");
}
return dateString;
}
// Convert PDF date string to time. Returns -1 if conversion fails.
time_t dateStringToTime(const GooString *dateString) {
int year, mon, day, hour, min, sec, tz_hour, tz_minute;
char tz;
struct tm tm;
time_t time;
if (!parseDateString (dateString->c_str(), &year, &mon, &day, &hour, &min, &sec, &tz, &tz_hour, &tz_minute))
return -1;
tm.tm_year = year - 1900;
tm.tm_mon = mon - 1;
tm.tm_mday = day;
tm.tm_hour = hour;
tm.tm_min = min;
tm.tm_sec = sec;
tm.tm_wday = -1;
tm.tm_yday = -1;
tm.tm_isdst = -1; /* 0 = DST off, 1 = DST on, -1 = don't know */
/* compute tm_wday and tm_yday and check date */
time = timegm (&tm);
if (time == (time_t)-1)
return time;
time_t offset = (tz_hour*60 + tz_minute)*60;
if (tz == '-')
offset *= -1;
time -= offset;
return time;
}
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