targets/typemapping.py
author Paul Beltyukov <beltyukov.p.a@gmail.com>
Fri, 09 Sep 2016 11:47:00 +0500
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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#Copyright (C) 2011: Edouard TISSERANT and Laurent BESSARD
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#
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#See COPYING file for copyrights details.
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#
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#This library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#General Public License for more details.
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#
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#You should have received a copy of the GNU General Public
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import ctypes
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ctypes.pythonapi.PyString_AsString.argtypes = (ctypes.c_void_p,)
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ctypes.pythonapi.PyString_AsString.restype = ctypes.POINTER(ctypes.c_char)
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from ctypes import *
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from datetime import timedelta as td
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class IEC_STRING(Structure):
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    """
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    Must be changed according to changes in iec_types.h
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    """
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    _fields_ = [("len", c_uint8),
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                ("body", c_char * 126)]
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class IEC_TIME(Structure):
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    """
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    Must be changed according to changes in iec_types.h
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    """
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    _fields_ = [("s", c_long), #tv_sec
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                ("ns", c_long)] #tv_nsec
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def _t(t, u=lambda x:x.value, p=lambda t,x:t(x)): return  (t, u, p)
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def _ttime(): return (IEC_TIME,
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                      lambda x:td(0, x.s, x.ns/1000),
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                      lambda t,x:t(x.days * 24 * 3600 + x.seconds, x.microseconds*1000))
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SameEndianessTypeTranslator = {
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    "BOOL" :       _t(c_uint8,  lambda x:x.value!=0),
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    "STEP" :       _t(c_uint8),
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    "TRANSITION" : _t(c_uint8),
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    "ACTION" :     _t(c_uint8),
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    "SINT" :       _t(c_int8),
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    "USINT" :      _t(c_uint8),
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    "BYTE" :       _t(c_uint8),
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    "STRING" :     (IEC_STRING,
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                      lambda x:x.body[:x.len],
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                      lambda t,x:t(len(x),x)),
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    "INT" :        _t(c_int16),
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    "UINT" :       _t(c_uint16),
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    "WORD" :       _t(c_uint16),
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    "DINT" :       _t(c_int32),
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    "UDINT" :      _t(c_uint32),
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    "DWORD" :      _t(c_uint32),
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    "LINT" :       _t(c_int64),
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    "ULINT" :      _t(c_uint64),
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    "LWORD" :      _t(c_uint64),
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    "REAL" :       _t(c_float),
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    "LREAL" :      _t(c_double),
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    "TIME" :       _ttime(),
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    "TOD" :        _ttime(),
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    "DATE" :       _ttime(),
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    "DT" :         _ttime(),
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    }
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SwapedEndianessTypeTranslator = {
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    #TODO
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    }
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TypeTranslator=SameEndianessTypeTranslator
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# Construct debugger natively supported types
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DebugTypesSize =  dict([(key,sizeof(t)) for key,(t,p,u) in SameEndianessTypeTranslator.iteritems() if t is not None])
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def UnpackDebugBuffer(buff, indexes):
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    res =  []
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    buffoffset = 0
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    buffsize = len(buff)
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    buffptr = cast(ctypes.pythonapi.PyString_AsString(id(buff)),c_void_p).value
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    for iectype in indexes:
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        c_type,unpack_func, pack_func = \
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            TypeTranslator.get(iectype,
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                                    (None,None,None))
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        if c_type is not None and buffoffset < buffsize:
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            cursor = c_void_p( buffptr + buffoffset)
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            value = unpack_func( cast(cursor,
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                         POINTER(c_type)).contents)
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            buffoffset += sizeof(c_type) if iectype != "STRING" else len(value)+1
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            res.append(value)
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        else:
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            break
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    if buffoffset and buffoffset == buffsize:
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        return res
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    return None
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LogLevels = ["CRITICAL","WARNING","INFO","DEBUG"]
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LogLevelsCount = len(LogLevels)
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LogLevelsDict = dict(zip(LogLevels,range(LogLevelsCount)))
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LogLevelsDefault = LogLevelsDict["DEBUG"]
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