beremiz

use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

2019-01-06, Andrey Skvortsov
68f4f2d4516b
use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

This code could be possible reused on low-end targets with limited RAM.

code to generate lookup table:
[---------------------------------------------------------------------]

/* CRC lookup table and initial state. */
uint32_t crc32_table[256];

/* Generate CRC32 lookup table. */
void GenerateCRC32Table(void)
{
unsigned int i, j;
/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */
uint32_t poly = 0xEDB88320;

for (i = 0; i <= 0xFF; i++)
{
uint32_t c = i;
for (j = 0 ; j < 8 ; j++)
c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
crc32_table[i] = c;
}
}

void main(void)
{
GenerateCRC32Table();
int j=0;
for(int i=0; i<256; i++) {
printf("0x%08X, ", crc32_table[i]);
if (++j >= 8) {
j = 0;
printf("\n");
}
}
}
[---------------------------------------------------------------------]
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from __future__ import absolute_import
import wx
from controls import VariablePanel
class EditorPanel(wx.SplitterWindow):
VARIABLE_PANEL_TYPE = None
def _init_Editor(self, prnt):
self.Editor = None
def _init_MenuItems(self):
self.MenuItems = []
def _init_ctrls(self, parent):
self.SetMinimumPaneSize(1)
self._init_MenuItems()
if self.VARIABLE_PANEL_TYPE is not None:
self.VariableEditor = VariablePanel(self, self, self.Controler, self.VARIABLE_PANEL_TYPE, self.Debug)
self.VariableEditor.SetTagName(self.TagName)
else:
self.VariableEditor = None
self._init_Editor(self)
if self.Editor is not None and self.VariableEditor is not None:
self.SplitHorizontally(self.VariableEditor, self.Editor, 200)
elif self.VariableEditor is not None:
self.Initialize(self.VariableEditor)
elif self.Editor is not None:
self.Initialize(self.Editor)
def __init__(self, parent, tagname, window, controler, debug=False):
wx.SplitterWindow.__init__(self, parent,
style=wx.SUNKEN_BORDER | wx.SP_3D)
self.ParentWindow = window
self.Controler = controler
self.TagName = tagname
self.Icon = None
self.Debug = debug
self._init_ctrls(parent)
def SetTagName(self, tagname):
self.TagName = tagname
if self.VARIABLE_PANEL_TYPE is not None:
self.VariableEditor.SetTagName(tagname)
def GetTagName(self):
return self.TagName
def Select(self):
self.ParentWindow.EditProjectElement(None, self.GetTagName(), True)
def GetTitle(self):
return ".".join(self.TagName.split("::")[1:])
def GetIcon(self):
return self.Icon
def SetIcon(self, icon):
self.Icon = icon
def IsViewing(self, tagname):
return self.GetTagName() == tagname
def IsDebugging(self):
return self.Debug
def SetMode(self, mode):
pass
def ResetBuffer(self):
pass
def IsModified(self):
return False
def CheckSaveBeforeClosing(self):
return True
def Save(self):
pass
def SaveAs(self):
pass
def GetBufferState(self):
if self.Controler is not None:
return self.Controler.GetBufferState()
return False, False
def Undo(self):
if self.Controler is not None:
self.Controler.LoadPrevious()
self.RefreshView()
def Redo(self):
if self.Controler is not None:
self.Controler.LoadNext()
self.RefreshView()
def Find(self, direction, search_params):
pass
def HasNoModel(self):
return False
def RefreshView(self, variablepanel=True):
if variablepanel:
self.RefreshVariablePanel()
def RefreshVariablePanel(self):
if self.VariableEditor is not None:
self.VariableEditor.RefreshView()
def GetConfNodeMenuItems(self):
return self.MenuItems
def RefreshConfNodeMenu(self, confnode_menu):
pass
def _Refresh(self, *args):
self.ParentWindow._Refresh(*args)
def RefreshScaling(self, refresh=True):
pass
def AddHighlight(self, infos, start, end, highlight_type):
if self.VariableEditor is not None and infos[0] in ["var_local", "var_input", "var_output", "var_inout"]:
self.VariableEditor.AddVariableHighlight(infos[1:], highlight_type)
def RemoveHighlight(self, infos, start, end, highlight_type):
if self.VariableEditor is not None and infos[0] in ["var_local", "var_input", "var_output", "var_inout"]:
self.VariableEditor.RemoveVariableHighlight(infos[1:], highlight_type)
def ClearHighlights(self, highlight_type=None):
if self.VariableEditor is not None:
self.VariableEditor.ClearHighlights(highlight_type)