diff -r e8cf68d69447 -r 2b7e2db31d81 runtime/typemapping.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/runtime/typemapping.py	Mon Jan 15 14:43:53 2018 +0100
@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# See COPYING.Runtime file for copyrights details.
+#
+
+from __future__ import absolute_import
+import ctypes
+from ctypes import *
+from datetime import timedelta as td
+
+ctypes.pythonapi.PyString_AsString.argtypes = (ctypes.c_void_p,)
+ctypes.pythonapi.PyString_AsString.restype = ctypes.POINTER(ctypes.c_char)
+
+
+class IEC_STRING(Structure):
+    """
+    Must be changed according to changes in iec_types.h
+    """
+    _fields_ = [("len", c_uint8),
+                ("body", c_char * 126)]
+
+
+class IEC_TIME(Structure):
+    """
+    Must be changed according to changes in iec_types.h
+    """
+    _fields_ = [("s", c_long),   # tv_sec
+                ("ns", c_long)]  # tv_nsec
+
+
+def _t(t, u=lambda x: x.value, p=lambda t, x: t(x)):
+    return (t, u, p)
+
+
+def _ttime():
+    return (IEC_TIME,
+            lambda x: td(0, x.s, x.ns/1000),
+            lambda t, x: t(x.days * 24 * 3600 + x.seconds, x.microseconds*1000))
+
+
+SameEndianessTypeTranslator = {
+    "BOOL":       _t(c_uint8, lambda x: x.value != 0),
+    "STEP":       _t(c_uint8),
+    "TRANSITION": _t(c_uint8),
+    "ACTION":     _t(c_uint8),
+    "SINT":       _t(c_int8),
+    "USINT":      _t(c_uint8),
+    "BYTE":       _t(c_uint8),
+    "STRING":     (IEC_STRING,
+                   lambda x: x.body[:x.len],
+                   lambda t, x: t(len(x), x)),
+    "INT":        _t(c_int16),
+    "UINT":       _t(c_uint16),
+    "WORD":       _t(c_uint16),
+    "DINT":       _t(c_int32),
+    "UDINT":      _t(c_uint32),
+    "DWORD":      _t(c_uint32),
+    "LINT":       _t(c_int64),
+    "ULINT":      _t(c_uint64),
+    "LWORD":      _t(c_uint64),
+    "REAL":       _t(c_float),
+    "LREAL":      _t(c_double),
+    "TIME":       _ttime(),
+    "TOD":        _ttime(),
+    "DATE":       _ttime(),
+    "DT":         _ttime(),
+    }
+
+SwapedEndianessTypeTranslator = {
+    # TODO
+    }
+
+TypeTranslator = SameEndianessTypeTranslator
+
+# Construct debugger natively supported types
+DebugTypesSize = dict([(key, sizeof(t)) for key, (t, p, u) in SameEndianessTypeTranslator.iteritems() if t is not None])
+
+
+def UnpackDebugBuffer(buff, indexes):
+    res = []
+    buffoffset = 0
+    buffsize = len(buff)
+    buffptr = cast(ctypes.pythonapi.PyString_AsString(id(buff)), c_void_p).value
+    for iectype in indexes:
+        c_type, unpack_func, _pack_func = \
+            TypeTranslator.get(iectype, (None, None, None))
+        if c_type is not None and buffoffset < buffsize:
+            cursor = c_void_p(buffptr + buffoffset)
+            value = unpack_func(cast(cursor,
+                                     POINTER(c_type)).contents)
+            buffoffset += sizeof(c_type) if iectype != "STRING" else len(value)+1
+            res.append(value)
+        else:
+            break
+    if buffoffset and buffoffset == buffsize:
+        return res
+    return None