AbstractCRC32::calculate() - Code Metrics - Inspection of "# updated readme" - pburggraf/CRC - Measure and Improve Code Quality continuously with Scrutinizer

Completed

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by Philip

created 2017-05-06 08:56 UTC

AbstractCRC32::calculate() B

↳ Parent: AbstractCRC32

Complexity

Conditions	4
Paths	6

Size

Total Lines	23
Code Lines	12

Duplication

Lines	23
Ratio	100 %

Importance

Changes

Metric	Value
dl	23
loc	23
rs	8.7972
c	0
b	0
f	0
cc	4
eloc	12
nc	6
nop	1

<?php

namespace PBurggraf\CRC\CRC32;

use PBurggraf\CRC\AbstractCRC;

/**
 * @author Philip Burggraf <[email protected]>
 */
abstract class AbstractCRC32 extends AbstractCRC

{
    /**
     * @param string $buffer
     *
     * @return int
     */
    public function calculate(string $buffer): int
    {
        $crc = $this->init;

        $bufferLength = strlen($buffer);

        for ($bufferPosition = 0; $bufferPosition < $bufferLength; ++$bufferPosition) {
            $character = ord($buffer[$bufferPosition]);

            if ($this->reverseIn) {
                $character = $this->binaryReverse($character, 8);
            }

            $crc = $this->lookupTable[(($crc >> 24) ^ $character) & 0xff] ^ ($crc << 8);
            $crc &= 0xffffffff;
        }

        if ($this->reverseOut) {
            $crc = $this->binaryReverse($crc, 32);
        }

        return $crc ^ $this->xorOut;
    }

    /**
     * @param int $polynomial
     *
     * @return array
     */
    public function generateTable(int $polynomial): array
    {
        $tableSize = 256;

        $table = [];

        for ($iterator = 0; $iterator < $tableSize; ++$iterator) {
            $temp = 0;
            $a = ($iterator << 24);
            for ($j = 0; $j < 8; ++$j) {
                if ((($temp ^ $a) & 0x80000000) !== 0) {
                    $temp = (($temp << 1) ^ $polynomial);
                } else {
                    $temp <<= 1;
                }
                $a <<= 1;
            }
            $table[$iterator] = $temp & 0xffffffff;
        }

        return $table;
    }
}


1		<?php
2
3		namespace PBurggraf\CRC\CRC32;
4
5		use PBurggraf\CRC\AbstractCRC;
6
7		/**
8		* @author Philip Burggraf <[email protected]>
9		*/
10	View Code Duplication	abstract class AbstractCRC32 extends AbstractCRC
		0 ignored issues – show Duplication introduced 2017-05-06 08:58 UTC by Report Bug Copy Issue Report This class seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
11		{
12		/**
13		* @param string $buffer
14		*
15		* @return int
16		*/
17		public function calculate(string $buffer): int
18		{
19		$crc = $this->init;
20
21		$bufferLength = strlen($buffer);
22
23		for ($bufferPosition = 0; $bufferPosition < $bufferLength; ++$bufferPosition) {
24		$character = ord($buffer[$bufferPosition]);
25
26		if ($this->reverseIn) {
27		$character = $this->binaryReverse($character, 8);
28		}
29
30		$crc = $this->lookupTable[(($crc >> 24) ^ $character) & 0xff] ^ ($crc << 8);
31		$crc &= 0xffffffff;
32		}
33
34		if ($this->reverseOut) {
35		$crc = $this->binaryReverse($crc, 32);
36		}
37
38		return $crc ^ $this->xorOut;
39		}
40
41		/**
42		* @param int $polynomial
43		*
44		* @return array
45		*/
46		public function generateTable(int $polynomial): array
47		{
48		$tableSize = 256;
49
50		$table = [];
51
52		for ($iterator = 0; $iterator < $tableSize; ++$iterator) {
53		$temp = 0;
54		$a = ($iterator << 24);
55		for ($j = 0; $j < 8; ++$j) {
56		if ((($temp ^ $a) & 0x80000000) !== 0) {
57		$temp = (($temp << 1) ^ $polynomial);
58		} else {
59		$temp <<= 1;
60		}
61		$a <<= 1;
62		}
63		$table[$iterator] = $temp & 0xffffffff;
64		}
65
66		return $table;
67		}
68		}
69

pburggraf / CRC

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AbstractCRC32::calculate() B

Complexity

Size

Duplication

Importance

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