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