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:
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/* 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");
}
}
}
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image: skvorl/beremiz-requirements

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pipelines:

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  default:

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    - parallel:

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        - step:

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            name: Codestyle checks

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - /usr/bin/python --version

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              - ./tests/tools/check_source.sh

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        - step:

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            name: Application tests

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            max-time: 10

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - ./tests/tools/run_python_tests.sh

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