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vendor/bacon/bacon-qr-code/tests/BaconQrCode/Common/ReedSolomonCodecTest.php

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+<?php
+/**
+ * BaconQrCode
+ *
+ * @link      http://github.com/Bacon/BaconQrCode For the canonical source repository
+ * @copyright 2013 Ben 'DASPRiD' Scholzen
+ * @license   http://opensource.org/licenses/BSD-2-Clause Simplified BSD License
+ */
+
+namespace BaconQrCode\Common;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use SplFixedArray;
+
+class ReedSolomonTest extends TestCase
+{
+    public static function tabProvider()
+    {
+        return array(
+            array(2, 0x7,   1, 1, 1),
+            array(3, 0xb,   1, 1, 2),
+            array(4, 0x13,  1, 1, 4),
+            array(5, 0x25,  1, 1, 6),
+            array(6, 0x43,  1, 1, 8),
+            array(7, 0x89,  1, 1, 10),
+            array(8, 0x11d, 1, 1, 32),
+        );
+    }
+
+    /**
+     * @dataProvider tabProvider
+     * @param        integer $symbolSize
+     * @param        integer $generatorPoly
+     * @param        integer $firstRoot
+     * @param        integer $primitive
+     * @param        integer $numRoots
+     * @return       void
+     */
+    public function testCodec($symbolSize, $generatorPoly, $firstRoot, $primitive, $numRoots)
+    {
+        if (defined('MT_RAND_PHP')) {
+            mt_srand(0xdeadbeef, MT_RAND_PHP);
+        } else {
+            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       = array();
+
+            // 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, $blockSize);
+                } while ($errorLocations[$errorLocation] !== 0);
+
+                $errorLocations[$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 && $foundErrors === null) {
+                $this->assertEquals($block, $tBlock, 'Decoder failed to correct errors');
+            }
+
+            $this->assertEquals($errors, $foundErrors, 'Found errors do not equal expected errors');
+
+            for ($i = 0; $i < $foundErrors; $i++) {
+                if ($errorLocations[$erasures[$i]] === 0) {
+                    $this->fail(sprintf('Decoder indicates error in location %d without error', $erasures[$i]));
+                }
+            }
+
+            $this->assertEquals($block, $tBlock, 'Decoder did not correct errors');
+        }
+    }
+}