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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category  Zend
  * @package   Zend_Validate
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  * @version   $Id$
  */
 
 /**
  * @see Zend_Validate_Abstract
  */
 // require_once 'Zend/Validate/Abstract.php';
 
 /**
  * Validator for the hash of given files
  *
  * @category  Zend
  * @package   Zend_Validate
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Validate_File_Hash extends Zend_Validate_Abstract
 {
     /**
      * @const string Error constants
      */
     const DOES_NOT_MATCH = 'fileHashDoesNotMatch';
     const NOT_DETECTED   = 'fileHashHashNotDetected';
     const NOT_FOUND      = 'fileHashNotFound';
 
     /**
      * @var array Error message templates
      */
     protected $_messageTemplates = array(
         self::DOES_NOT_MATCH => "File '%value%' does not match the given hashes",
         self::NOT_DETECTED   => "A hash could not be evaluated for the given file",
         self::NOT_FOUND      => "File '%value%' is not readable or does not exist"
     );
 
     /**
      * Hash of the file
      *
      * @var string
      */
     protected $_hash;
 
     /**
      * Sets validator options
      *
      * @param  string|array $options
      * @throws Zend_Validate_Exception
      */
     public function __construct($options)
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         } elseif (is_scalar($options)) {
             $options = array('hash1' => $options);
         } elseif (!is_array($options)) {
             // require_once 'Zend/Validate/Exception.php';
             throw new Zend_Validate_Exception('Invalid options to validator provided');
         }
 
         if (1 < func_num_args()) {
             $options['algorithm'] = func_get_arg(1);
         }
 
         $this->setHash($options);
     }
 
     /**
      * Returns the set hash values as array, the hash as key and the algorithm the value
      *
      * @return array
      */
     public function getHash()
     {
         return $this->_hash;
     }
 
     /**
      * Sets the hash for one or multiple files
      *
      * @param  string|array $options
      * @return Zend_Validate_File_Hash Provides a fluent interface
      */
     public function setHash($options)
     {
         $this->_hash  = null;
         $this->addHash($options);
 
         return $this;
     }
 
     /**
      * Adds the hash for one or multiple files
      *
      * @param  string|array $options
      * @throws Zend_Validate_Exception
      * @return Zend_Validate_File_Hash Provides a fluent interface
      */
     public function addHash($options)
     {
         if (is_string($options)) {
             $options = array($options);
         } else if (!is_array($options)) {
             // require_once 'Zend/Validate/Exception.php';
             throw new Zend_Validate_Exception("False parameter given");
         }
 
         $known = hash_algos();
         if (!isset($options['algorithm'])) {
             $algorithm = 'crc32';
         } else {
             $algorithm = $options['algorithm'];
             unset($options['algorithm']);
         }
 
         if (!in_array($algorithm, $known)) {
             // require_once 'Zend/Validate/Exception.php';
             throw new Zend_Validate_Exception("Unknown algorithm '{$algorithm}'");
         }
 
         foreach ($options as $value) {
             $this->_hash[$value] = $algorithm;
         }
 
         return $this;
     }
 
     /**
      * Defined by Zend_Validate_Interface
      *
      * Returns true if and only if the given file confirms the set hash
      *
      * @param  string $value Filename to check for hash
      * @param  array  $file  File data from Zend_File_Transfer
      * @return boolean
      */
     public function isValid($value, $file = null)
     {
         // Is file readable ?
         // require_once 'Zend/Loader.php';
         if (!Zend_Loader::isReadable($value)) {
             return $this->_throw($file, self::NOT_FOUND);
         }
 
         $algos  = array_unique(array_values($this->_hash));
         $hashes = array_unique(array_keys($this->_hash));
         foreach ($algos as $algorithm) {
             $filehash = hash_file($algorithm, $value);
             if ($filehash === false) {
                 return $this->_throw($file, self::NOT_DETECTED);
             }
 
             foreach($hashes as $hash) {
                 if ($filehash === $hash) {
                     return true;
                 }
             }
         }
 
         return $this->_throw($file, self::DOES_NOT_MATCH);
     }
 
     /**
      * Throws an error of the given type
      *
      * @param  string $file
      * @param  string $errorType
      * @return false
      */
     protected function _throw($file, $errorType)
     {
         if ($file !== null) {
             $this->_value = $file['name'];
         }
 
         $this->_error($errorType);
         return false;
     }
 }