[interchange] Add filter for encoding HTML 2 special entities "&<>.

[Stefan Hornburg]

commit badedf0224e763099e318ba8d376f6cdec180225
Author: Stefan Hornburg (Racke) <racke at linuxia.de>
Date:   Thu May 13 11:28:09 2010 +0200

    Add filter for encoding HTML 2 special entities "&<>.

 MANIFEST                                   |    1 +
 code/Filter/encode_special_entities.filter |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/MANIFEST b/MANIFEST
index c97c408..06e444d 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -22,6 +22,7 @@ code/Filter/digits_dot.filter
 code/Filter/dos.filter
 code/Filter/duration.filter
 code/Filter/encode_entities.filter
+code/Filter/encode_special_entities.filter
 code/Filter/encrypt.filter
 code/Filter/filesafe.filter
 code/Filter/filter_select.filter
diff --git a/code/Filter/encode_special_entities.filter b/code/Filter/encode_special_entities.filter
new file mode 100644
index 0000000..0046da8
--- /dev/null
+++ b/code/Filter/encode_special_entities.filter
@@ -0,0 +1,21 @@
+# Copyright 2010 Interchange Development Group
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.  See the LICENSE file for details.
+
+CodeDef encode_special_entities Filter
+CodeDef encode_special_entities Description Encode HTML special entities "&<>
+CodeDef encode_special_entities Routine <<EOR
+sub {
+	my $val = shift;
+
+	$val =~ s/"/&quot;/g;
+	$val =~ s/&/&amp;/g;
+	$val =~ s/</&lt;/g;
+	$val =~ s/>/&gt;/g;
+
+	return $val;
+}
+EOR
\ No newline at end of file