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 -*-
# Copyright (C) 2018: Smarteh
#
# See COPYING file for copyrights details.
from __future__ import absolute_import
from __future__ import print_function
import wx
from zope.interface import implementer
from controls.UriLocationEditor import IConnectorPanel
URITypes = ["LOCAL", "PYRO", "PYROS"]
def PYRO_connector_dialog(confnodesroot):
[ID_IPTEXT, ID_PORTTEXT] = [wx.NewId() for _init_ctrls in range(2)]
@implementer(IConnectorPanel)
class PYROConnectorPanel(wx.Panel):
def __init__(self, typeConnector, parrent, *args, **kwargs):
self.type = typeConnector
self.parrent = parrent
wx.Panel.__init__(self, parrent, *args, **kwargs)
self._init_ctrls()
self._init_sizers()
self.uri = None
def _init_ctrls(self):
self.IpText = wx.TextCtrl(parent=self, id=ID_IPTEXT, size=wx.Size(200, -1))
self.PortText = wx.TextCtrl(parent=self, id=ID_PORTTEXT, size=wx.Size(200, -1))
def _init_sizers(self):
self.mainSizer = wx.FlexGridSizer(cols=2, hgap=10, rows=5, vgap=10)
self.mainSizer.AddWindow(wx.StaticText(self, label=_("URI host:")),
flag=wx.ALIGN_CENTER_VERTICAL)
self.mainSizer.AddWindow(self.IpText, flag=wx.GROW)
self.mainSizer.AddWindow(wx.StaticText(self, label=_("URI port:")),
flag=wx.ALIGN_CENTER_VERTICAL)
self.mainSizer.AddWindow(self.PortText, flag=wx.GROW)
self.SetSizer(self.mainSizer)
def SetURI(self, uri):
self.uri = uri
uri_list = uri.strip().split(":")
length = len(uri_list)
if length == 3:
self.IpText.SetValue(uri_list[1].strip("/"))
self.PortText.SetValue(uri_list[2])
elif length == 2:
self.IpText.SetValue(uri_list[1].strip("/"))
def GetURI(self):
self.uri = self.type+"://"+self.IpText.GetValue()+":"+self.PortText.GetValue()
return self.uri
return PYROConnectorPanel("PYRO", confnodesroot)