87 lines
2.1 KiB
PHP
87 lines
2.1 KiB
PHP
<?php
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/**
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* Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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namespace Aws\Common\Hash;
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use Aws\Common\Exception\LogicException;
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/**
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* Encapsulates the creation of a hash from streamed chunks of data
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*/
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class ChunkHash implements ChunkHashInterface
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{
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/**
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* @var resource The hash context as created by `hash_init()`
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*/
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protected $context;
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/**
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* @var string The resulting hash in hex form
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*/
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protected $hash;
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/**
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* @var string The resulting hash in binary form
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*/
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protected $hashRaw;
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/**
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* {@inheritdoc}
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*/
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public function __construct($algorithm = self::DEFAULT_ALGORITHM)
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{
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HashUtils::validateAlgorithm($algorithm);
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$this->context = hash_init($algorithm);
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}
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/**
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* {@inheritdoc}
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*/
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public function addData($data)
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{
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if (!$this->context) {
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throw new LogicException('You may not add more data to a finalized chunk hash.');
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}
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hash_update($this->context, $data);
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return $this;
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}
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/**
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* {@inheritdoc}
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*/
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public function getHash($returnBinaryForm = false)
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{
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if (!$this->hash) {
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$this->hashRaw = hash_final($this->context, true);
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$this->hash = HashUtils::binToHex($this->hashRaw);
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$this->context = null;
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}
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return $returnBinaryForm ? $this->hashRaw : $this->hash;
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}
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/**
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* {@inheritdoc}
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*/
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public function __clone()
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{
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if ($this->context) {
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$this->context = hash_copy($this->context);
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}
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}
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}
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