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<?php
declare(strict_types = 1);
namespace BaconQrCodeTest\Common;
use BaconQrCode\Common\ReedSolomonCodec;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;
use SplFixedArray;
class ReedSolomonCodecTest extends TestCase
{
public static function tabs() : array
{
return [
[2, 0x7, 1, 1, 1],
[3, 0xb, 1, 1, 2],
[4, 0x13, 1, 1, 4],
[5, 0x25, 1, 1, 6],
[6, 0x43, 1, 1, 8],
[7, 0x89, 1, 1, 10],
[8, 0x11d, 1, 1, 32],
];
}
#[DataProvider('tabs')]
public function testCodec(int $symbolSize, int $generatorPoly, int $firstRoot, int $primitive, int $numRoots) : void
{
mt_srand(0xdeadbeef);
$blockSize = (1 << $symbolSize) - 1;
$dataSize = $blockSize - $numRoots;
$codec = new ReedSolomonCodec($symbolSize, $generatorPoly, $firstRoot, $primitive, $numRoots, 0);
for ($errors = 0; $errors <= $numRoots / 2; ++$errors) {
// Load block with random data and encode
$block = SplFixedArray::fromArray(array_fill(0, $blockSize, 0), false);
for ($i = 0; $i < $dataSize; ++$i) {
$block[$i] = mt_rand(0, $blockSize);
}
// Make temporary copy
$tBlock = clone $block;
$parity = SplFixedArray::fromArray(array_fill(0, $numRoots, 0), false);
$errorLocations = SplFixedArray::fromArray(array_fill(0, $blockSize, 0), false);
$erasures = [];
// Create parity
$codec->encode($block, $parity);
// Copy parity into test blocks
for ($i = 0; $i < $numRoots; ++$i) {
$block[$i + $dataSize] = $parity[$i];
$tBlock[$i + $dataSize] = $parity[$i];
}
// Seed with errors
for ($i = 0; $i < $errors; ++$i) {
$errorValue = mt_rand(1, $blockSize);
do {
$errorLocation = mt_rand(0, $blockSize - 1);
} while (0 !== $errorLocations[$errorLocation]);
$errorLocations[$errorLocation] = 1;
if (mt_rand(0, 1)) {
$erasures[] = $errorLocation;
}
$tBlock[$errorLocation] ^= $errorValue;
}
$erasures = SplFixedArray::fromArray($erasures, false);
// Decode the errored block
$foundErrors = $codec->decode($tBlock, $erasures);
if ($errors > 0 && null === $foundErrors) {
$this->assertSame($block, $tBlock, 'Decoder failed to correct errors');
}
$this->assertSame($errors, $foundErrors, 'Found errors do not equal expected errors');
for ($i = 0; $i < $foundErrors; ++$i) {
if (0 === $errorLocations[$erasures[$i]]) {
$this->fail(sprintf('Decoder indicates error in location %d without error', $erasures[$i]));
}
}
$this->assertEquals($block, $tBlock, 'Decoder did not correct errors');
}
}
}
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