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Current File : /home/thillelirn/www/wp-content/plugins/wpforms-lite/vendor_prefixed/true/punycode/src/Punycode.php
<?php

namespace WPForms\Vendor\TrueBV;

use WPForms\Vendor\TrueBV\Exception\DomainOutOfBoundsException;
use WPForms\Vendor\TrueBV\Exception\LabelOutOfBoundsException;
/**
 * Punycode implementation as described in RFC 3492
 *
 * @link http://tools.ietf.org/html/rfc3492
 */
class Punycode
{
    /**
     * Bootstring parameter values
     *
     */
    const BASE = 36;
    const TMIN = 1;
    const TMAX = 26;
    const SKEW = 38;
    const DAMP = 700;
    const INITIAL_BIAS = 72;
    const INITIAL_N = 128;
    const PREFIX = 'xn--';
    const DELIMITER = '-';
    /**
     * Encode table
     *
     * @param array
     */
    protected static $encodeTable = array('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', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
    /**
     * Decode table
     *
     * @param array
     */
    protected static $decodeTable = array('a' => 0, 'b' => 1, 'c' => 2, 'd' => 3, 'e' => 4, 'f' => 5, 'g' => 6, 'h' => 7, 'i' => 8, 'j' => 9, 'k' => 10, 'l' => 11, 'm' => 12, 'n' => 13, 'o' => 14, 'p' => 15, 'q' => 16, 'r' => 17, 's' => 18, 't' => 19, 'u' => 20, 'v' => 21, 'w' => 22, 'x' => 23, 'y' => 24, 'z' => 25, '0' => 26, '1' => 27, '2' => 28, '3' => 29, '4' => 30, '5' => 31, '6' => 32, '7' => 33, '8' => 34, '9' => 35);
    /**
     * Character encoding
     *
     * @param string
     */
    protected $encoding;
    /**
     * Constructor
     *
     * @param string $encoding Character encoding
     */
    public function __construct($encoding = 'UTF-8')
    {
        $this->encoding = $encoding;
    }
    /**
     * Encode a domain to its Punycode version
     *
     * @param string $input Domain name in Unicode to be encoded
     * @return string Punycode representation in ASCII
     */
    public function encode($input)
    {
        $input = \mb_strtolower($input, $this->encoding);
        $parts = \explode('.', $input);
        foreach ($parts as &$part) {
            $length = \strlen($part);
            if ($length < 1) {
                throw new LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
            }
            $part = $this->encodePart($part);
        }
        $output = \implode('.', $parts);
        $length = \strlen($output);
        if ($length > 255) {
            throw new DomainOutOfBoundsException(\sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));
        }
        return $output;
    }
    /**
     * Encode a part of a domain name, such as tld, to its Punycode version
     *
     * @param string $input Part of a domain name
     * @return string Punycode representation of a domain part
     */
    protected function encodePart($input)
    {
        $codePoints = $this->listCodePoints($input);
        $n = static::INITIAL_N;
        $bias = static::INITIAL_BIAS;
        $delta = 0;
        $h = $b = \count($codePoints['basic']);
        $output = '';
        foreach ($codePoints['basic'] as $code) {
            $output .= $this->codePointToChar($code);
        }
        if ($input === $output) {
            return $output;
        }
        if ($b > 0) {
            $output .= static::DELIMITER;
        }
        $codePoints['nonBasic'] = \array_unique($codePoints['nonBasic']);
        \sort($codePoints['nonBasic']);
        $i = 0;
        $length = \mb_strlen($input, $this->encoding);
        while ($h < $length) {
            $m = $codePoints['nonBasic'][$i++];
            $delta = $delta + ($m - $n) * ($h + 1);
            $n = $m;
            foreach ($codePoints['all'] as $c) {
                if ($c < $n || $c < static::INITIAL_N) {
                    $delta++;
                }
                if ($c === $n) {
                    $q = $delta;
                    for ($k = static::BASE;; $k += static::BASE) {
                        $t = $this->calculateThreshold($k, $bias);
                        if ($q < $t) {
                            break;
                        }
                        $code = $t + ($q - $t) % (static::BASE - $t);
                        $output .= static::$encodeTable[$code];
                        $q = ($q - $t) / (static::BASE - $t);
                    }
                    $output .= static::$encodeTable[$q];
                    $bias = $this->adapt($delta, $h + 1, $h === $b);
                    $delta = 0;
                    $h++;
                }
            }
            $delta++;
            $n++;
        }
        $out = static::PREFIX . $output;
        $length = \strlen($out);
        if ($length > 63 || $length < 1) {
            throw new LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
        }
        return $out;
    }
    /**
     * Decode a Punycode domain name to its Unicode counterpart
     *
     * @param string $input Domain name in Punycode
     * @return string Unicode domain name
     */
    public function decode($input)
    {
        $input = \strtolower($input);
        $parts = \explode('.', $input);
        foreach ($parts as &$part) {
            $length = \strlen($part);
            if ($length > 63 || $length < 1) {
                throw new LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
            }
            if (\strpos($part, static::PREFIX) !== 0) {
                continue;
            }
            $part = \substr($part, \strlen(static::PREFIX));
            $part = $this->decodePart($part);
        }
        $output = \implode('.', $parts);
        $length = \strlen($output);
        if ($length > 255) {
            throw new DomainOutOfBoundsException(\sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));
        }
        return $output;
    }
    /**
     * Decode a part of domain name, such as tld
     *
     * @param string $input Part of a domain name
     * @return string Unicode domain part
     */
    protected function decodePart($input)
    {
        $n = static::INITIAL_N;
        $i = 0;
        $bias = static::INITIAL_BIAS;
        $output = '';
        $pos = \strrpos($input, static::DELIMITER);
        if ($pos !== \false) {
            $output = \substr($input, 0, $pos++);
        } else {
            $pos = 0;
        }
        $outputLength = \strlen($output);
        $inputLength = \strlen($input);
        while ($pos < $inputLength) {
            $oldi = $i;
            $w = 1;
            for ($k = static::BASE;; $k += static::BASE) {
                $digit = static::$decodeTable[$input[$pos++]];
                $i = $i + $digit * $w;
                $t = $this->calculateThreshold($k, $bias);
                if ($digit < $t) {
                    break;
                }
                $w = $w * (static::BASE - $t);
            }
            $bias = $this->adapt($i - $oldi, ++$outputLength, $oldi === 0);
            $n = $n + (int) ($i / $outputLength);
            $i = $i % $outputLength;
            $output = \mb_substr($output, 0, $i, $this->encoding) . $this->codePointToChar($n) . \mb_substr($output, $i, $outputLength - 1, $this->encoding);
            $i++;
        }
        return $output;
    }
    /**
     * Calculate the bias threshold to fall between TMIN and TMAX
     *
     * @param integer $k
     * @param integer $bias
     * @return integer
     */
    protected function calculateThreshold($k, $bias)
    {
        if ($k <= $bias + static::TMIN) {
            return static::TMIN;
        } elseif ($k >= $bias + static::TMAX) {
            return static::TMAX;
        }
        return $k - $bias;
    }
    /**
     * Bias adaptation
     *
     * @param integer $delta
     * @param integer $numPoints
     * @param boolean $firstTime
     * @return integer
     */
    protected function adapt($delta, $numPoints, $firstTime)
    {
        $delta = (int) ($firstTime ? $delta / static::DAMP : $delta / 2);
        $delta += (int) ($delta / $numPoints);
        $k = 0;
        while ($delta > (static::BASE - static::TMIN) * static::TMAX / 2) {
            $delta = (int) ($delta / (static::BASE - static::TMIN));
            $k = $k + static::BASE;
        }
        $k = $k + (int) ((static::BASE - static::TMIN + 1) * $delta / ($delta + static::SKEW));
        return $k;
    }
    /**
     * List code points for a given input
     *
     * @param string $input
     * @return array Multi-dimension array with basic, non-basic and aggregated code points
     */
    protected function listCodePoints($input)
    {
        $codePoints = array('all' => array(), 'basic' => array(), 'nonBasic' => array());
        $length = \mb_strlen($input, $this->encoding);
        for ($i = 0; $i < $length; $i++) {
            $char = \mb_substr($input, $i, 1, $this->encoding);
            $code = $this->charToCodePoint($char);
            if ($code < 128) {
                $codePoints['all'][] = $codePoints['basic'][] = $code;
            } else {
                $codePoints['all'][] = $codePoints['nonBasic'][] = $code;
            }
        }
        return $codePoints;
    }
    /**
     * Convert a single or multi-byte character to its code point
     *
     * @param string $char
     * @return integer
     */
    protected function charToCodePoint($char)
    {
        $code = \ord($char[0]);
        if ($code < 128) {
            return $code;
        } elseif ($code < 224) {
            return ($code - 192) * 64 + (\ord($char[1]) - 128);
        } elseif ($code < 240) {
            return ($code - 224) * 4096 + (\ord($char[1]) - 128) * 64 + (\ord($char[2]) - 128);
        } else {
            return ($code - 240) * 262144 + (\ord($char[1]) - 128) * 4096 + (\ord($char[2]) - 128) * 64 + (\ord($char[3]) - 128);
        }
    }
    /**
     * Convert a code point to its single or multi-byte character
     *
     * @param integer $code
     * @return string
     */
    protected function codePointToChar($code)
    {
        if ($code <= 0x7f) {
            return \chr($code);
        } elseif ($code <= 0x7ff) {
            return \chr(($code >> 6) + 192) . \chr(($code & 63) + 128);
        } elseif ($code <= 0xffff) {
            return \chr(($code >> 12) + 224) . \chr(($code >> 6 & 63) + 128) . \chr(($code & 63) + 128);
        } else {
            return \chr(($code >> 18) + 240) . \chr(($code >> 12 & 63) + 128) . \chr(($code >> 6 & 63) + 128) . \chr(($code & 63) + 128);
        }
    }
}

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