add timezone parser

1 files changed, 64 insertions, 0 deletions

diff --git a/functions/parse_tzs.php b/functions/parse_tzs.php
new file mode 100644
index 0000000..85ab929
--- /dev/null
+++ b/functions/parse_tzs.php
@@ -0,0 +1,64 @@
+<?php
+$ifile = @fopen($filename, "r");
+if ($ifile == FALSE) exit(error($lang['l_error_cantopen'], $filename));
+$nextline = fgets($ifile, 1024);
+if (trim($nextline) != 'BEGIN:VCALENDAR') exit(error($lang['l_error_invalidcal'], $filename));
+
+// read file in line by line
+// XXX end line is skipped because of the 1-line readahead
+while (!feof($ifile)) {
+	$line = $nextline;
+	$nextline = fgets($ifile, 1024);
+	$nextline = ereg_replace("[\r\n]", "", $nextline);
+	#handle continuation lines that start with either a space or a tab (MS Outlook)
+	while (isset($nextline{0}) && ($nextline{0} == " " || $nextline{0} == "\t")) { 
+		$line = $line . substr($nextline, 1);
+		$nextline = fgets($ifile, 1024);
+		$nextline = ereg_replace("[\r\n]", "", $nextline);
+	}
+	$line = trim($line);
+	
+	switch ($line) {
+		case 'BEGIN:VTIMEZONE':
+			unset($tz_name, $offset_from, $offset_to, $tz_id);
+			break;
+		case 'BEGIN:STANDARD':
+			unset ($offset_s);
+			break;
+		case 'END:STANDARD':
+			$offset_s = $offset_to;
+			break;
+		case 'BEGIN:DAYLIGHT':
+			unset ($offset_d);
+			break;
+		case 'END:DAYLIGHT':
+			$offset_d = $offset_to;
+			break;
+		case 'END:VTIMEZONE':
+			$tz_array[$tz_id] = array($offset_s, $offset_d); #echo "<pre>$tz_id"; print_r($tz_array[$tz_id]);echo"</pre>";
+			break;
+		default:
+			unset ( $data, $prop_pos, $property);
+			if (ereg ("([^:]+):(.*)", $line, $line)){
+				$property = $line[1];
+				$data = $line[2];
+				$prop_pos = strpos($property,';');
+				if ($prop_pos !== false) $property = substr($property,0,$prop_pos);
+				$property = strtoupper($property);
+			
+				switch ($property) {		
+					case 'TZID':
+						$tz_id = $data;
+						break;
+					case 'TZOFFSETFROM':
+						$offset_from = $data;
+						break;
+					case 'TZOFFSETTO':
+						$offset_to = $data;
+						break;
+				}
+			}	
+	}
+}
+
+?>
\ No newline at end of file