beremiz

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

2019-01-06, Andrey Skvortsov
68f4f2d4516b
file isExecutable
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");
}
}
}
[---------------------------------------------------------------------]
#!/bin/sh
cleanup()
{
find $PYTEST_DIR -name '*.pyc' -delete
}
print_help()
{
echo "Usage: run_python_tests.sh [--on-local-xserver]"
echo ""
echo "--on-local-xserver"
echo " all tests are run on local X-server. "
echo " User can see test in action."
echo " Any interaction (mouse, keyboard) should be avoided"
echo " By default without arguments script runs pytest on virtual X serverf."
echo ""
exit 1
}
main()
{
LC_ALL=ru_RU.utf-8
PYTEST_DIR=./tests/tools
if [ ! -d $PYTEST_DIR ]; then
echo "Script should be run from top directory in repository"
exit 1;
fi
use_xvfb=0
if [ "$1" != "--on-local-xserver" ]; then
export DISPLAY=:42
use_xvfb=1
Xvfb $DISPLAY -screen 0 1280x1024x24 &
sleep 1
fi
cleanup
ret=0
DELAY=400
KILL_DELAY=$(($DELAY + 30))
timeout -k $KILL_DELAY $DELAY pytest --timeout=10 ./tests/tools
ret=$?
cleanup
[ $use_xvfb = 1 ] && pkill -9 Xvfb
exit $ret
}
[ "$1" = "--help" -o "$1" = "-h" ] && print_help
main $@