feature: Add q-bridge-mib tagged VLAN membership #3285

includes/functions.php

@@ -1647,3 +1647,41 @@ function getCIMCentPhysical($location, &$entphysical, &$index)
         return $index;
     } // end if - Level 1
 } // end function
+
+
+/* idea from http://php.net/manual/en/function.hex2bin.php comments */
+function hex2bin_compat($str)
+{
+    if (strlen($str) % 2 !== 0) {
+        trigger_error(__FUNCTION__.'(): Hexadecimal input string must have an even length', E_USER_WARNING);
+    }
+    return pack("H*", $str);
+}
+
+if (!function_exists('hex2bin')) {
+    // This is only a hack
+    function hex2bin($str)
+    {
+        return hex2bin_compat($str);
+    }
+}
+
+function q_bridge_bits2indices($hex_data)
+{
+    /* convert hex string to an array of 1-based indices of the nonzero bits
+     * ie. '9a00' -> '100110100000' -> array(1, 4, 5, 7)
+    */
+    $hex_data = str_replace(' ', '', $hex_data);
+    $value = hex2bin($hex_data);
+    $length = strlen($value);
+    $indices = array();
+    for ($i = 0; $i < $length; $i++) {
+        $byte = ord($value[$i]);
+        for ($j = 7; $j >= 0; $j--) {
+            if ($byte & (1 << $j)) {
+                $indices[] = 8*$i + 8-$j;
+            }
+        }
+    }
+    return $indices;
+}