add pdf and mobi libraries

inc/3rdparty/libraries/send2kindle/utils.php

@@ -0,0 +1,37 @@
+<?php
+/**
+ * Utils for news2kindle
+ * @author jwest <jwest@jwest.pl>
+ */
+class Utils
+{
+    /**
+     * URL encode
+     * @param string $url
+     * @return string $ar_url
+     */
+    public static function urlencode( $url )
+    {
+        $ar_url = explode( '/', $url );
+
+        foreach ( $ar_url as $key => $val )
+        {
+            $ar_url[ $key ] = urlencode( $val );
+        }
+
+        return implode('/', $ar_url );
+    }
+
+    /**
+     * Prepare ID for google rss article    
+     * @param string $id
+     * @return string
+     */
+    public static function prepare_id($id)
+    {
+        $char_in = array('/', '.', ',', ':');
+        $id = str_replace($char_in, '-', $id);
+        
+        return $id;
+    }
+}