CONTRIBUTING.md
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499 68f4f2d4516b
parent 2241 e762e234181d
permissions -rw-r--r--
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");
}
}
}
[---------------------------------------------------------------------]
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How Do I Submit A Good Pull Request?
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It's highly recommended to write nice and clean python code. Beremiz
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project tries to follows most of PEP-8 recommendations. They are
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automatically checked on every push and merge by Bitbucket pipelines.
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To avoid pushing "unclean" code, i's recommended to add one of the following
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commands to pre commit Mercurial hook into .hg/hgrc configuration file.
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Unfortunately script can't distinguish between real commit and shelve. If you
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are using shelve (or maybe some other affected commands), it's recommended to
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use pre-<command> and post-<command> hooks to create flags to skip checks on
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some operations.
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```
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[hooks]
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pre-shelve.linter = touch .hg/skiphook
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post-shelve.linter = rm .hg/skiphook
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pretxncommit.linter = ./tests/tools/check_source.sh --only-changes
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```
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or the same done using Docker container, so result will be the same as
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on Bitbucket pipeline.
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```
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[hooks]
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pre-shelve.linter = touch .hg/skiphook
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post-shelve.linter = rm .hg/skiphook
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pretxncommit.linter = hg status -m -n -a -n -I '**.py' --change $HG_NODE > files.lst && docker run --volume=$PWD:/beremiz --workdir="/beremiz" --volume=$PWD/../CanFestival-3:/CanFestival-3 --memory=1g --entrypoint=/beremiz/tests/tools/check_source.sh skvorl/beremiz-requirements --files-to-check files.lst
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```