avoid fatal errors when decoding advert packets

src/CoreParser.php

@@ -105,6 +105,7 @@ class CoreParser {
         $m->pub_key = base64_encode(substr($payload, 1, CoreProtocol::PUB_KEY_SIZE));
  
         if( strlen($payload) > CoreProtocol::PUB_KEY_SIZE + 2 ) {
+            try {
                 $m->type = ord($payload[33]);
                 $m->flags = ord($payload[34]);
                 $m->out_path = substr($payload, 35, CoreProtocol::MAX_PATH_SIZE);
@@ -114,6 +115,11 @@ class CoreParser {
                 $m->lon = unpack('V', substr($payload, 211, 4))[1];
                 $m->last_mod = unpack('V', substr($payload, 215, 4))[1];
             }
+            catch(\Throwable $t) {
+                // hidden problem?  packet wasn't long enough so we'll just be missing data i suppose
+                error_log("Tried to decode Advert but packet too small.  Packet size: " . strlen($payload) . " and expected 215..");
+            }
+        }
 
         return $m;
     }