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");
}
}
}
[---------------------------------------------------------------------]
// import Nevow.Athena
// import Divmod.Base
function updateAttr(id, param, value) {
Nevow.Athena.Widget.fromAthenaID(1).callRemote('HMIexec', 'setattr', id, param, value);
}
var svguiWidgets = new Array();
var currentObject = null;
function setCurrentObject(obj) {
currentObject = obj;
}
function isCurrentObject(obj) {
return currentObject == obj;
}
function getSVGElementById(id) {
return document.getElementById(id);
}
function blockSVGElementDrag(element) {
element.addEventListener("draggesture", function(event){event.stopPropagation()}, true);
}
LiveSVGPage.LiveSVGWidget = Nevow.Athena.Widget.subclass('LiveSVGPage.LiveSVGWidget');
LiveSVGPage.LiveSVGWidget.methods(
function handleEvent(self, evt) {
if (currentObject != null) {
currentObject.handleEvent(evt);
}
},
function receiveData(self, data){
dataReceived = json_parse(data);
gadget = svguiWidgets[dataReceived.id]
if (gadget) {
gadget.updateValues(json_parse(dataReceived.kwargs));
}
//console.log("OBJET : " + dataReceived.back_id + " STATE : " + newState);
},
function init(self, arg1){
//console.log("Object received : " + arg1);
for (ind in arg1) {
gad = json_parse(arg1[ind]);
args = json_parse(gad.kwargs);
gadget = new svguilib[gad.__class__](self, gad.id, args);
svguiWidgets[gadget.id]=gadget;
//console.log('GADGET :' + gadget);
}
var elements = document.getElementsByTagName("svg");
for (var i = 0; i < elements.length; i++) {
elements[i].addEventListener("mouseup", self, false);
}
//console.log("SVGUIWIDGETS : " + svguiWidgets);
}
);