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<?php
/**
 * Copyright 2019 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Google\CRC32;

use Google\CRC32\CRC32;
use Google\CRC32\CRCInterface;

/**
 * A CRC32 implementation based on the PHP hash functions.
 */
final class Builtin implements CRCInterface
{
    private $hc;

    private static $mapping = [
        CRC32::IEEE => 'crc32b',
        CRC32::CASTAGNOLI => 'crc32c',
    ];

    /**
     * Returns true if this $polynomial is supported by the builtin PHP hash function.
     *
     * @param  integer  $polynomial  The polynomial
     *
     * @return  boolean
     */
    public static function supports($polynomial)
    {
        if (!isset(self::$mapping[$polynomial])) {
            return false;
        }
        $algo = self::$mapping[$polynomial];
        return in_array($algo, hash_algos());
    }

    public function __construct($polynomial)
    {
        if (!self::supports($polynomial)) {
            throw new \InvalidArgumentException("hash_algos() does not list this polynomial.");
        }

        $this->algo = self::$mapping[$polynomial];
        $this->reset();
    }

    public function reset()
    {
        $this->hc = hash_init($this->algo);
    }

    public function update($data)
    {
        hash_update($this->hc, $data);
    }

    public function hash($raw_output = null)
    {
        // hash_final will destory the Hash Context resource, so operate on a copy.
        $hc = hash_copy($this->hc);
        return hash_final($hc, $raw_output);
    }

    public function version()
    {
        return $this->algo . ' PHP HASH';
    }

    public function __clone()
    {
        $this->hc = hash_copy($this->hc);
    }
}

Filemanager

Name Type Size Permission Actions
Builtin.php File 2.16 KB 0644
CRC32.php File 2.79 KB 0644
CRCInterface.php File 1.67 KB 0644
CRCTrait.php File 1.65 KB 0644
Google.php File 1.67 KB 0644
PHP.php File 1.86 KB 0644
PHPSlicedBy4.php File 3 KB 0644
Table.php File 3.22 KB 0644