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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;
/**
* CRC calculation interface.
*
* Lots of great info on the different algorithms used:
* https://create.stephan-brumme.com/crc32/
*/
interface CRCInterface
{
/**
* Updates the CRC calculation with the supplied data.
*
* @param string $data The data
*/
public function update($data);
/**
* Resets the CRC calculation.
*/
public function reset();
/**
* Return the current calculated CRC hash.
*
* @param boolean $raw_output When set to TRUE, outputs raw binary data.
* FALSE outputs lowercase hexits.
*
* @return string Returns a string containing the calculated CRC as
* lowercase hexits unless raw_output is set to true in
* which case the raw binary representation of the CRC is
* returned.
*/
public function hash($raw_output = null);
/**
* Returns information about the CRC implementation and polynomial.
*
* @return string
*/
public function version();
}
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