Current File : /home/graphicd/public_html/vebto/vendor/google/crc32/src/PHP.php
<?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\CRCInterface;
use Google\CRC32\CRCTrait;
use Google\CRC32\Table;
/**
* PHP implementation of the CRC32 algorithm.
*
* Uses a simple lookup table to improve the performances.
*/
final class PHP implements CRCInterface
{
use CRCTrait;
public static function supports($algo)
{
return true;
}
private $table = [];
/**
* Creates a new instance for this polynomial.
*
* @param integer $polynomial The polynomial
*/
public function __construct($polynomial)
{
$this->polynomial = $polynomial;
$this->table = Table::get($polynomial);
$this->reset();
}
public function reset()
{
$this->crc = ~0;
}
public function update($data)
{
$crc = $this->crc;
$table = $this->table;
$len = strlen($data);
for ($i = 0; $i < $len; ++$i) {
$crc = (($crc >> 8) & 0xffffff) ^ $table[($crc ^ ord($data[$i])) & 0xff];
}
$this->crc = $crc;
}
public function hash($raw_output = null)
{
return $this->crcHash(~$this->crc, $raw_output === true);
}
public function version()
{
return 'crc32(' . $this->int2hex($this->polynomial) . ') software version';
}
}
Mini Shell