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");
}
}
}
[---------------------------------------------------------------------]

     1

# those files are used in runtime

     2

# licensed according to LGPL, see COPYING.runtime 

     3

     4

images/icostop24.png

     5

images/icoplay24.png

     6

images/brz.png

     7

util/__init__.py

     8

util/paths.py

     9

runtime/WampClient.py

    10

runtime/PLCObject.py

    11

runtime/NevowServer.py

    12

runtime/webinterface.js

    13

runtime/__init__.py

    14

runtime/ServicePublisher.py

    15

runtime/typemapping.py 

    16

runtime/loglevels.py 

    17

Beremiz_service.py

    18

version.py