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<?php
/**
* This file is part of the ramsey/uuid library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
* @link https://benramsey.com/projects/ramsey-uuid/ Documentation
* @link https://packagist.org/packages/ramsey/uuid Packagist
* @link https://github.com/ramsey/uuid GitHub
*/
namespace Ramsey\Uuid\Codec;
use Ramsey\Uuid\UuidInterface;
/**
* GuidStringCodec encodes and decodes globally unique identifiers (GUID)
*
* @link https://en.wikipedia.org/wiki/Globally_unique_identifier
*/
class GuidStringCodec extends StringCodec
{
/**
* Encodes a UuidInterface as a string representation of a GUID
*
* @param UuidInterface $uuid
* @return string Hexadecimal string representation of a GUID
*/
public function encode(UuidInterface $uuid)
{
$components = array_values($uuid->getFieldsHex());
// Swap byte-order on the first three fields
$this->swapFields($components);
return vsprintf(
'%08s-%04s-%04s-%02s%02s-%012s',
$components
);
}
/**
* Encodes a UuidInterface as a binary representation of a GUID
*
* @param UuidInterface $uuid
* @return string Binary string representation of a GUID
*/
public function encodeBinary(UuidInterface $uuid)
{
$components = array_values($uuid->getFieldsHex());
return hex2bin(implode('', $components));
}
/**
* Decodes a string representation of a GUID into a UuidInterface object instance
*
* @param string $encodedUuid
* @return UuidInterface
*/
public function decode($encodedUuid)
{
$components = $this->extractComponents($encodedUuid);
$this->swapFields($components);
return $this->getBuilder()->build($this, $this->getFields($components));
}
/**
* Decodes a binary representation of a GUID into a UuidInterface object instance
*
* @param string $bytes
* @return UuidInterface
*/
public function decodeBytes($bytes)
{
// Specifically call parent::decode to preserve correct byte order
return parent::decode(bin2hex($bytes));
}
/**
* Swaps fields to support GUID byte order
*
* @param array $components An array of UUID components (the UUID exploded on its dashes)
* @return void
*/
protected function swapFields(array &$components)
{
$hex = unpack('H*', pack('L', hexdec($components[0])));
$components[0] = $hex[1];
$hex = unpack('H*', pack('S', hexdec($components[1])));
$components[1] = $hex[1];
$hex = unpack('H*', pack('S', hexdec($components[2])));
$components[2] = $hex[1];
}
}