Revision: 1666
http://mrbs.svn.sourceforge.net/mrbs/?rev=1666&view=rev
Author: cimorrison
Date: 2010-12-03 16:46:12 +0000 (Fri, 03 Dec 2010)
Log Message:
-----------
Implemented "folding"
Modified Paths:
--------------
mrbs/branches/ics_attachments/web/functions_ical.inc
Modified: mrbs/branches/ics_attachments/web/functions_ical.inc
===================================================================
--- mrbs/branches/ics_attachments/web/functions_ical.inc 2010-12-03
16:12:52 UTC (rev 1665)
+++ mrbs/branches/ics_attachments/web/functions_ical.inc 2010-12-03
16:46:12 UTC (rev 1666)
@@ -5,6 +5,42 @@
define ('RFC5545_FORMAT', 'Ymd\THis'); // Format for expressing iCalendar
dates
+// "Folds" lines longer than 75 octets
+//
+// "Lines of text SHOULD NOT be longer than 75 octets, excluding the line
+// break. Long content lines SHOULD be split into a multiple line
+// representations using a line "folding" technique. That is, a long
+// line can be split between any two characters by inserting a CRLF
+// immediately followed by a single linear white-space character (i.e.,
+// SPACE or HTAB). Any sequence of CRLF followed immediately by a
+// single linear white-space character is ignored (i.e., removed) when
+// processing the content type." (RFC 5545)
+function ical_fold($str)
+{
+ $result = '';
+ $col = 0;
+ for ($i=0; $i<strlen($str); $i++)
+ {
+ // If we've reached a CRLF reset the column counter
+ // to the beginning of the line
+ if (($str[$i] == "\r") &&
+ (($i+1) < strlen($str)) &&
+ ($str[$i+1] == "\n"))
+ {
+ $col = -2; // -2 because we'll then be at 0 after the \r\n
+ }
+ // Otherwise if we've already had 75 characters, insert
+ // a CRLF followed by a space (and so the column counter will be 1)
+ elseif ($col >= 75)
+ {
+ $result .= "\r\n ";
+ $col = 1;
+ }
+ $result .= $str[$i];
+ $col++;
+ }
+ return $result;
+}
// Escape text for use in an iCalendar object
function ical_escape_text($str)
@@ -138,7 +174,8 @@
$result = implode($eol, $results);
$result .= $eol; // Has to end with a CRLF
-
+
+ $result = ical_fold($result);
return $result;
}
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