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 ProjectPropertiesPanel, VariablePanel
from editors.ConfTreeNodeEditor import ConfTreeNodeEditor
from plcopen.types_enums import ComputeConfigurationName
class ProjectNodeEditor(ConfTreeNodeEditor):
SHOW_BASE_PARAMS = False
ENABLE_REQUIRED = True
CONFNODEEDITOR_TABS = [
(_("Config variables"), "_create_VariablePanel"),
(_("Project properties"), "_create_ProjectPropertiesPanel")]
def _create_VariablePanel(self, prnt):
self.VariableEditorPanel = VariablePanel(prnt, self, self.Controler, "config", self.Debug)
self.VariableEditorPanel.SetTagName(self.TagName)
return self.VariableEditorPanel
def _create_ProjectPropertiesPanel(self, prnt):
self.ProjectProperties = ProjectPropertiesPanel(prnt, self.Controler, self.ParentWindow, self.ENABLE_REQUIRED)
return self.ProjectProperties
def __init__(self, parent, controler, window):
configuration = controler.GetProjectMainConfigurationName()
if configuration is not None:
tagname = ComputeConfigurationName(configuration)
else:
tagname = ""
ConfTreeNodeEditor.__init__(self, parent, controler, window, tagname)
buttons_sizer = self.GenerateMethodButtonSizer()
self.MainSizer.InsertSizer(0, buttons_sizer, 0, border=5, flag=wx.ALL)
self.MainSizer.Layout()
self.VariableEditor = self.VariableEditorPanel
def GetTagName(self):
return self.Controler.CTNName()
def SetTagName(self, tagname):
self.TagName = tagname
if self.VariableEditor is not None:
self.VariableEditor.SetTagName(tagname)
def GetTitle(self):
fullname = _(self.Controler.CTNName())
if self.Controler.CTNTestModified():
return "~%s~" % fullname
return fullname
def RefreshView(self, variablepanel=True):
ConfTreeNodeEditor.RefreshView(self)
self.VariableEditorPanel.RefreshView()
self.ProjectProperties.RefreshView()
def GetBufferState(self):
return self.Controler.GetBufferState()
def Undo(self):
self.Controler.LoadPrevious()
self.ParentWindow.CloseTabsWithoutModel()
def Redo(self):
self.Controler.LoadNext()
self.ParentWindow.CloseTabsWithoutModel()