source/libs/poppler/poppler-src/poppler/DateInfo.cc

   1 //========================================================================
   2 //
   3 // DateInfo.cc
   4 //
   5 // Copyright (C) 2008 Albert Astals Cid <aacid@kde.org>
   6 // Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
   7 // Copyright (C) 2015 André Guerreiro <aguerreiro1985@gmail.com>
   8 // Copyright (C) 2015 André Esser <bepandre@hotmail.com>
   9 // Copyright (C) 2016 Adrian Johnson <ajohnson@redneon.com>
  10 //
  11 // To see a description of the changes please see the Changelog file that
  12 // came with your tarball or type make ChangeLog if you are building from git
  13 //
  14 //========================================================================
  15
  16 //========================================================================
  17 //
  18 // Based on code from pdfinfo.cc
  19 //
  20 // Copyright 1998-2003 Glyph & Cog, LLC
  21 //
  22 //========================================================================
  23
  24 #include <config.h>
  25
  26 #include "glibc.h"
  27 #include "DateInfo.h"
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31
  32 /* See PDF Reference 1.3, Section 3.8.2 for PDF Date representation */
  33 GBool parseDateString(const char *dateString, int *year, int *month, int *day, int *hour, int *minute, int *second, char *tz, int *tzHour, int *tzMinute)
  34 {
  35     if ( dateString == NULL ) return gFalse;
  36     if ( strlen(dateString) < 2 ) return gFalse;
  37
  38     if ( dateString[0] == 'D' && dateString[1] == ':' )
  39         dateString += 2;
  40
  41     *month = 1;
  42     *day = 1;
  43     *hour = 0;
  44     *minute = 0;
  45     *second = 0;
  46     *tz = 0x00;
  47     *tzHour = 0;
  48     *tzMinute = 0;
  49
  50     if ( sscanf( dateString,
  51                  "%4d%2d%2d%2d%2d%2d%c%2d%*c%2d",
  52                  year, month, day, hour, minute, second,
  53                  tz, tzHour, tzMinute ) > 0 ) {
  54         /* Workaround for y2k bug in Distiller 3 stolen from gpdf, hoping that it won't
  55         * be used after y2.2k */
  56         if ( *year < 1930 && strlen (dateString) > 14)
  57         {
  58            int century, years_since_1900;
  59            if ( sscanf( dateString,
  60                         "%2d%3d%2d%2d%2d%2d%2d",
  61                         &century, &years_since_1900, month, day, hour, minute, second) == 7 )
  62            {
  63                *year = century * 100 + years_since_1900;
  64            }
  65            else
  66            {
  67                return gFalse;
  68            }
  69        }
  70
  71        if (*year <= 0) return gFalse;
  72
  73        return gTrue;
  74    }
  75
  76    return gFalse;
  77 }
  78
  79 // Convert time to PDF date string
  80 GooString *timeToDateString(time_t *timet) {
  81   GooString *dateString;
  82   char s[5];
  83   struct tm *gt;
  84   size_t len;
  85   time_t timep = timet ? *timet : time(NULL);
  86   struct tm t;
  87
  88   gt = gmtime_r (&timep, &t);
  89
  90   dateString = new GooString ("D:");
  91
  92   /* Year YYYY */
  93   len = strftime (s, sizeof(s), "%Y", gt);
  94   dateString->append (s, len);
  95
  96   /* Month MM */
  97   len = strftime (s, sizeof(s), "%m", gt);
  98   dateString->append (s, len);
  99
 100   /* Day DD */
 101   len = strftime (s, sizeof(s), "%d", gt);
 102   dateString->append (s, len);
 103
 104   /* Hour HH */
 105   len = strftime (s, sizeof(s), "%H", gt);
 106   dateString->append (s, len);
 107
 108   /* Minute mm */
 109   len = strftime (s, sizeof(s), "%M", gt);
 110   dateString->append (s, len);
 111
 112   /* Second SS */
 113   len = strftime (s, sizeof(s), "%S", gt);
 114   dateString->append (s, len);
 115
 116   return dateString;
 117 }
 118
 119 // Convert PDF date string to time. Returns -1 if conversion fails.
 120 time_t dateStringToTime(GooString *dateString) {
 121   int year, mon, day, hour, min, sec, tz_hour, tz_minute;
 122   char tz;
 123   struct tm tm;
 124   time_t time;
 125
 126   if (!parseDateString (dateString->getCString(), &year, &mon, &day, &hour, &min, &sec, &tz, &tz_hour, &tz_minute))
 127     return -1;
 128
 129   tm.tm_year = year - 1900;
 130   tm.tm_mon = mon - 1;
 131   tm.tm_mday = day;
 132   tm.tm_hour = hour;
 133   tm.tm_min = min;
 134   tm.tm_sec = sec;
 135   tm.tm_wday = -1;
 136   tm.tm_yday = -1;
 137   tm.tm_isdst = -1; /* 0 = DST off, 1 = DST on, -1 = don't know */
 138
 139   /* compute tm_wday and tm_yday and check date */
 140   time = timegm (&tm);
 141   if (time == (time_t)-1)
 142     return time;
 143
 144   time_t offset = (tz_hour*60 + tz_minute)*60;
 145   if (tz == '-')
 146     offset *= -1;
 147   time -= offset;
 148
 149   return time;
 150 }