X501\StringPrep\TranscodeStep

Complexity

Total Complexity

7

Size/Duplication

Total Lines	50
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

100%

Importance

Changes	1
Bugs	0	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	3	1
A	apply()	0	23	6

<?php

declare(strict_types = 1);

namespace Sop\X501\StringPrep;

use Sop\ASN1\Element;
use Sop\ASN1\Type\Primitive\T61String;

/**
 * Implements 'Transcode' step of the Internationalized String Preparation
 * as specified by RFC 4518.
 *
 * @see https://tools.ietf.org/html/rfc4518#section-2.1
 */
class TranscodeStep implements PrepareStep
{
    /**
     * ASN.1 type of the string.
     *
     * @var int
     */
    protected $_type;

    /**
     * Constructor.
     *
     * @param int $type ASN.1 type tag of the string
     */
    public function __construct(int $type)
    {
        $this->_type = $type;
    }

    /**
     * @param string $string String to prepare
     *
     * @throws \LogicException If string type is not supported
     *
     * @return string UTF-8 encoded string
     */
    public function apply(string $string): string
    {
        switch ($this->_type) {
            // UTF-8 string as is
            case Element::TYPE_UTF8_STRING:
                return $string;
            // PrintableString maps directly to UTF-8
            case Element::TYPE_PRINTABLE_STRING:
                return $string;
            // UCS-2 to UTF-8
            case Element::TYPE_BMP_STRING:
                return mb_convert_encoding($string, 'UTF-8', 'UCS-2BE');
            // UCS-4 to UTF-8
            case Element::TYPE_UNIVERSAL_STRING:
                return mb_convert_encoding($string, 'UTF-8', 'UCS-4BE');
            // TeletexString mapping is a local matter.
            // We take a shortcut here and encode it as a hexstring.
            case Element::TYPE_T61_STRING:
                $el = new T61String($string);
                return '#' . bin2hex($el->toDER());
        }
        throw new \LogicException(
            'Unsupported string type ' . Element::tagToName($this->_type) . '.');
    }
}