<?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

 * @license   http://framework.zend.com/license/new-bsd     New BSD License

 */

/**

 * @see Zend_Validate_File_Hash

 */

require_once 'Zend/Validate/File/Hash.php';

/**

 * Validator for the crc32 hash of given files

 *

 * @category  Zend

 * @package   Zend_Validate

 * @license   http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Validate_File_Crc32 extends Zend_Validate_File_Hash

{

    /**

     * @const string Error constants

     */

    const DOES_NOT_MATCH = 'fileCrc32DoesNotMatch';

    const NOT_DETECTED   = 'fileCrc32NotDetected';

    const NOT_FOUND      = 'fileCrc32NotFound';

    /**

     * @var array Error message templates

     */

    protected $_messageTemplates = array(

        self::DOES_NOT_MATCH => "File '%value%' does not match the given crc32 hashes",

        self::NOT_DETECTED   => "A crc32 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|Zend_Config $options

     */

    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');

        }

        $this->setCrc32($options);

    }

    /**

     * Returns all set crc32 hashes

     *

     * @return array

     */

    public function getCrc32()

    {

        return $this->getHash();

    }

    /**

     * Sets the crc32 hash for one or multiple files

     *

     * @param  string|array $options

     * @return Zend_Validate_File_Hash Provides a fluent interface

     */

    public function setHash($options)

    {

        if (!is_array($options)) {

            $options = array($options);

        }

        $options['algorithm'] = 'crc32';

        parent::setHash($options);

        return $this;

    }

    /**

     * Sets the crc32 hash for one or multiple files

     *

     * @param  string|array $options

     * @return Zend_Validate_File_Hash Provides a fluent interface

     */

    public function setCrc32($options)

    {

        $this->setHash($options);

        return $this;

    }

    /**

     * Adds the crc32 hash for one or multiple files

     *

     * @param  string|array $options

     * @return Zend_Validate_File_Hash Provides a fluent interface

     */

    public function addHash($options)

    {

        if (!is_array($options)) {

            $options = array($options);

        }

        $options['algorithm'] = 'crc32';

        parent::addHash($options);

        return $this;

    }

    /**

     * Adds the crc32 hash for one or multiple files

     *

     * @param  string|array $options

     * @return Zend_Validate_File_Hash Provides a fluent interface

     */

    public function addCrc32($options)

    {

        $this->addHash($options);

        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);

        }

        $hashes = array_unique(array_keys($this->_hash));

        $filehash = hash_file('crc32', $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);

    }