first try on E-DSS-1 ISDN d-channel parsing

[auerswald-callnotifier.git] / src / callnotifier / EDSS1 / Parser.php

diff --git a/src/callnotifier/EDSS1/Parser.php b/src/callnotifier/EDSS1/Parser.php
new file mode 100644 (file)
index 0000000..5a298e5
--- /dev/null
+++ b/src/callnotifier/EDSS1/Parser.php
@@ -0,0 +1,41 @@
+<?php
+namespace callnotifier;
+
+class EDSS1_Parser
+{
+    const PARAM = 0;
+    const PARAMLENGTH = 1;
+    const PARAMVAL = 2;
+
+    public function parse($bytes)
+    {
+        $m = new EDSS1_Message();
+        $m->type = ord($bytes{7});
+
+        $curpos = 7;
+        $complete = false;
+        do {
+            //parameter type
+            $curbit = $bytes{++$curpos};
+            if ($curbit == "\xFF" && $bytes{$curpos + 1} == "\n") {
+                $complete = true;
+                break;
+            }
+            $param = new EDSS1_Parameter();
+            $m->parameters[] = $param;
+            $param->type     = ord($curbit);
+
+            //parameter length
+            $curbit = $bytes{++$curpos};
+            $param->length = ord($curbit);
+
+            //parameter data
+            $param->data = substr($bytes, $curpos + 1, $param->length);
+            $curpos += $param->length;
+        } while ($curpos < strlen($bytes) - 1);
+
+        return $m;
+    }
+}
+
+?>