<?php

/**
 * Class AlphaNum
 *
 * @filesource   AlphaNum.php
 * @created      25.11.2015
 * @package      chillerlan\QRCode\Data
 * @author       Smiley <smiley@chillerlan.net>
 * @copyright    2015 Smiley
 * @license      MIT
 */
namespace YoastSEO_Vendor\chillerlan\QRCode\Data;

use YoastSEO_Vendor\chillerlan\QRCode\QRCode;
/**
 * Alphanumeric mode: 0 to 9, A to Z, space, $ % * + - . / :
 */
class AlphaNum extends \YoastSEO_Vendor\chillerlan\QRCode\Data\QRDataAbstract
{
    const CHAR_MAP = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' ', '$', '%', '*', '+', '-', '.', '/', ':'];
    /**
     * @inheritdoc
     */
    protected $datamode = \YoastSEO_Vendor\chillerlan\QRCode\QRCode::DATA_ALPHANUM;
    /**
     * @inheritdoc
     */
    protected $lengthBits = [9, 11, 13];
    /**
     * @inheritdoc
     */
    protected function write($data)
    {
        for ($i = 0; $i + 1 < $this->strlen; $i += 2) {
            $this->bitBuffer->put($this->getCharCode($data[$i]) * 45 + $this->getCharCode($data[$i + 1]), 11);
        }
        if ($i < $this->strlen) {
            $this->bitBuffer->put($this->getCharCode($data[$i]), 6);
        }
    }
    /**
     * @param string $chr
     *
     * @return int
     * @throws \chillerlan\QRCode\Data\QRCodeDataException
     */
    protected function getCharCode($chr)
    {
        $i = \array_search($chr, $this::CHAR_MAP);
        if ($i !== \false) {
            return $i;
        }
        throw new \YoastSEO_Vendor\chillerlan\QRCode\Data\QRCodeDataException('illegal char: "' . $chr . '" [' . \ord($chr) . ']');
    }
}