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Edit File : Idn.php \| Size : 29.67 KB
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> and Trevor Rowbotham <trevor.rowbotham@pm.me> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Symfony\Polyfill\Intl\Idn; use Exception; use Normalizer; use Symfony\Polyfill\Intl\Idn\Resources\unidata\DisallowedRanges; use Symfony\Polyfill\Intl\Idn\Resources\unidata\Regex; /* * @see https://www.unicode.org/reports/tr46/ * * @internal / final class Idn { public const ERROR_EMPTY_LABEL = 1; public const ERROR_LABEL_TOO_LONG = 2; public const ERROR_DOMAIN_NAME_TOO_LONG = 4; public const ERROR_LEADING_HYPHEN = 8; public const ERROR_TRAILING_HYPHEN = 0x10; public const ERROR_HYPHEN_3_4 = 0x20; public const ERROR_LEADING_COMBINING_MARK = 0x40; public const ERROR_DISALLOWED = 0x80; public const ERROR_PUNYCODE = 0x100; public const ERROR_LABEL_HAS_DOT = 0x200; public const ERROR_INVALID_ACE_LABEL = 0x400; public const ERROR_BIDI = 0x800; public const ERROR_CONTEXTJ = 0x1000; public const ERROR_CONTEXTO_PUNCTUATION = 0x2000; public const ERROR_CONTEXTO_DIGITS = 0x4000; public const INTL_IDNA_VARIANT_2003 = 0; public const INTL_IDNA_VARIANT_UTS46 = 1; public const IDNA_DEFAULT = 0; public const IDNA_ALLOW_UNASSIGNED = 1; public const IDNA_USE_STD3_RULES = 2; public const IDNA_CHECK_BIDI = 4; public const IDNA_CHECK_CONTEXTJ = 8; public const IDNA_NONTRANSITIONAL_TO_ASCII = 16; public const IDNA_NONTRANSITIONAL_TO_UNICODE = 32; public const MAX_DOMAIN_SIZE = 253; public const MAX_LABEL_SIZE = 63; public const BASE = 36; public const TMIN = 1; public const TMAX = 26; public const SKEW = 38; public const DAMP = 700; public const INITIAL_BIAS = 72; public const INITIAL_N = 128; public const DELIMITER = '-'; public const MAX_INT = 2147483647; /* * Contains the numeric value of a basic code point (for use in representing integers) in the * range 0 to BASE-1, or -1 if b is does not represent a value. * * @var array<int, int> / private static $basicToDigit = [ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, ]; /* * @var array<int, int> / private static $virama; /* * @var array<int, string> / private static $mapped; /* * @var array<int, bool> / private static $ignored; /* * @var array<int, string> / private static $deviation; /* * @var array<int, bool> / private static $disallowed; /* * @var array<int, string> / private static $disallowed_STD3_mapped; /* * @var array<int, bool> / private static $disallowed_STD3_valid; /* * @var bool / private static $mappingTableLoaded = false; /* * @see https://www.unicode.org/reports/tr46/#ToASCII * * @param string $domainName * @param int $options * @param int $variant * @param array $idna_info * * @return string\|false / public static function idn_to_ascii($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = []) { if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) { @trigger_error('idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED); } $options = [ 'CheckHyphens' => true, 'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant \|\| 0 !== ($options & self::IDNA_CHECK_BIDI), 'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ), 'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES), 'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant \|\| 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_ASCII), 'VerifyDnsLength' => true, ]; $info = new Info(); $labels = self::process((string) $domainName, $options, $info); foreach ($labels as $i => $label) { // Only convert labels to punycode that contain non-ASCII code points if (1 === preg_match('/[^\x00-\x7F]/', $label)) { try { $label = 'xn--'.self::punycodeEncode($label); } catch (Exception $e) { $info->errors \|= self::ERROR_PUNYCODE; } $labels[$i] = $label; } } if ($options['VerifyDnsLength']) { self::validateDomainAndLabelLength($labels, $info); } $idna_info = [ 'result' => implode('.', $labels), 'isTransitionalDifferent' => $info->transitionalDifferent, 'errors' => $info->errors, ]; return 0 === $info->errors ? $idna_info['result'] : false; } /* * @see https://www.unicode.org/reports/tr46/#ToUnicode * * @param string $domainName * @param int $options * @param int $variant * @param array $idna_info * * @return string\|false / public static function idn_to_utf8($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = []) { if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) { @trigger_error('idn_to_utf8(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED); } $info = new Info(); $labels = self::process((string) $domainName, [ 'CheckHyphens' => true, 'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant \|\| 0 !== ($options & self::IDNA_CHECK_BIDI), 'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ), 'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES), 'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant \|\| 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_UNICODE), ], $info); $idna_info = [ 'result' => implode('.', $labels), 'isTransitionalDifferent' => $info->transitionalDifferent, 'errors' => $info->errors, ]; return 0 === $info->errors ? $idna_info['result'] : false; } /* * @param string $label * * @return bool / private static function isValidContextJ(array $codePoints, $label) { if (!isset(self::$virama)) { self::$virama = require __DIR__.\DIRECTORY_SEPARATOR.'Resources'.\DIRECTORY_SEPARATOR.'unidata'.\DIRECTORY_SEPARATOR.'virama.php'; } $offset = 0; foreach ($codePoints as $i => $codePoint) { if (0x200C !== $codePoint && 0x200D !== $codePoint) { continue; } if (!isset($codePoints[$i - 1])) { return false; } // If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True; if (isset(self::$virama[$codePoints[$i - 1]])) { continue; } // If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)\u200C(Joining_Type:T)(Joining_Type:{R,D})) Then // True; // Generated RegExp = ([Joining_Type:{L,D}][Joining_Type:T]\u200C[Joining_Type:T])[Joining_Type:{R,D}] if (0x200C === $codePoint && 1 === preg_match(Regex::ZWNJ, $label, $matches, \PREG_OFFSET_CAPTURE, $offset)) { $offset += \strlen($matches[1][0]); continue; } return false; } return true; } /* * @see https://www.unicode.org/reports/tr46/#ProcessingStepMap * * @param string $input * @param array<string, bool> $options * * @return string / private static function mapCodePoints($input, array $options, Info $info) { $str = ''; $useSTD3ASCIIRules = $options['UseSTD3ASCIIRules']; $transitional = $options['Transitional_Processing']; foreach (self::utf8Decode($input) as $codePoint) { $data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules); switch ($data['status']) { case 'disallowed': $info->errors \|= self::ERROR_DISALLOWED; // no break. case 'valid': $str .= mb_chr($codePoint, 'utf-8'); break; case 'ignored': // Do nothing. break; case 'mapped': $str .= $data['mapping']; break; case 'deviation': $info->transitionalDifferent = true; $str .= ($transitional ? $data['mapping'] : mb_chr($codePoint, 'utf-8')); break; } } return $str; } /* * @see https://www.unicode.org/reports/tr46/#Processing * * @param string $domain * @param array<string, bool> $options * * @return array<int, string> / private static function process($domain, array $options, Info $info) { // If VerifyDnsLength is not set, we are doing ToUnicode otherwise we are doing ToASCII and // we need to respect the VerifyDnsLength option. $checkForEmptyLabels = !isset($options['VerifyDnsLength']) \|\| $options['VerifyDnsLength']; if ($checkForEmptyLabels && '' === $domain) { $info->errors \|= self::ERROR_EMPTY_LABEL; return [$domain]; } // Step 1. Map each code point in the domain name string $domain = self::mapCodePoints($domain, $options, $info); // Step 2. Normalize the domain name string to Unicode Normalization Form C. if (!Normalizer::isNormalized($domain, Normalizer::FORM_C)) { $domain = Normalizer::normalize($domain, Normalizer::FORM_C); } // Step 3. Break the string into labels at U+002E (.) FULL STOP. $labels = explode('.', $domain); $lastLabelIndex = \count($labels) - 1; // Step 4. Convert and validate each label in the domain name string. foreach ($labels as $i => $label) { $validationOptions = $options; if ('xn--' === substr($label, 0, 4)) { try { $label = self::punycodeDecode(substr($label, 4)); } catch (Exception $e) { $info->errors \|= self::ERROR_PUNYCODE; continue; } $validationOptions['Transitional_Processing'] = false; $labels[$i] = $label; } self::validateLabel($label, $info, $validationOptions, $i > 0 && $i === $lastLabelIndex); } if ($info->bidiDomain && !$info->validBidiDomain) { $info->errors \|= self::ERROR_BIDI; } // Any input domain name string that does not record an error has been successfully // processed according to this specification. Conversely, if an input domain_name string // causes an error, then the processing of the input domain_name string fails. Determining // what to do with error input is up to the caller, and not in the scope of this document. return $labels; } /* * @see https://tools.ietf.org/html/rfc5893#section-2 * * @param string $label / private static function validateBidiLabel($label, Info $info) { if (1 === preg_match(Regex::RTL_LABEL, $label)) { $info->bidiDomain = true; // Step 1. The first character must be a character with Bidi property L, R, or AL. // If it has the R or AL property, it is an RTL label if (1 !== preg_match(Regex::BIDI_STEP_1_RTL, $label)) { $info->validBidiDomain = false; return; } // Step 2. In an RTL label, only characters with the Bidi properties R, AL, AN, EN, ES, // CS, ET, ON, BN, or NSM are allowed. if (1 === preg_match(Regex::BIDI_STEP_2, $label)) { $info->validBidiDomain = false; return; } // Step 3. In an RTL label, the end of the label must be a character with Bidi property // R, AL, EN, or AN, followed by zero or more characters with Bidi property NSM. if (1 !== preg_match(Regex::BIDI_STEP_3, $label)) { $info->validBidiDomain = false; return; } // Step 4. In an RTL label, if an EN is present, no AN may be present, and vice versa. if (1 === preg_match(Regex::BIDI_STEP_4_AN, $label) && 1 === preg_match(Regex::BIDI_STEP_4_EN, $label)) { $info->validBidiDomain = false; return; } return; } // We are a LTR label // Step 1. The first character must be a character with Bidi property L, R, or AL. // If it has the L property, it is an LTR label. if (1 !== preg_match(Regex::BIDI_STEP_1_LTR, $label)) { $info->validBidiDomain = false; return; } // Step 5. In an LTR label, only characters with the Bidi properties L, EN, // ES, CS, ET, ON, BN, or NSM are allowed. if (1 === preg_match(Regex::BIDI_STEP_5, $label)) { $info->validBidiDomain = false; return; } // Step 6.In an LTR label, the end of the label must be a character with Bidi property L or // EN, followed by zero or more characters with Bidi property NSM. if (1 !== preg_match(Regex::BIDI_STEP_6, $label)) { $info->validBidiDomain = false; return; } } /* * @param array<int, string> $labels / private static function validateDomainAndLabelLength(array $labels, Info $info) { $maxDomainSize = self::MAX_DOMAIN_SIZE; $length = \count($labels); // Number of "." delimiters. $domainLength = $length - 1; // If the last label is empty and it is not the first label, then it is the root label. // Increase the max size by 1, making it 254, to account for the root label's "." // delimiter. This also means we don't need to check the last label's length for being too // long. if ($length > 1 && '' === $labels[$length - 1]) { ++$maxDomainSize; --$length; } for ($i = 0; $i < $length; ++$i) { $bytes = \strlen($labels[$i]); $domainLength += $bytes; if ($bytes > self::MAX_LABEL_SIZE) { $info->errors \|= self::ERROR_LABEL_TOO_LONG; } } if ($domainLength > $maxDomainSize) { $info->errors \|= self::ERROR_DOMAIN_NAME_TOO_LONG; } } /* * @see https://www.unicode.org/reports/tr46/#Validity_Criteria * * @param string $label * @param array<string, bool> $options * @param bool $canBeEmpty / private static function validateLabel($label, Info $info, array $options, $canBeEmpty) { if ('' === $label) { if (!$canBeEmpty && (!isset($options['VerifyDnsLength']) \|\| $options['VerifyDnsLength'])) { $info->errors \|= self::ERROR_EMPTY_LABEL; } return; } // Step 1. The label must be in Unicode Normalization Form C. if (!Normalizer::isNormalized($label, Normalizer::FORM_C)) { $info->errors \|= self::ERROR_INVALID_ACE_LABEL; } $codePoints = self::utf8Decode($label); if ($options['CheckHyphens']) { // Step 2. If CheckHyphens, the label must not contain a U+002D HYPHEN-MINUS character // in both the thrid and fourth positions. if (isset($codePoints[2], $codePoints[3]) && 0x002D === $codePoints[2] && 0x002D === $codePoints[3]) { $info->errors \|= self::ERROR_HYPHEN_3_4; } // Step 3. If CheckHyphens, the label must neither begin nor end with a U+002D // HYPHEN-MINUS character. if ('-' === substr($label, 0, 1)) { $info->errors \|= self::ERROR_LEADING_HYPHEN; } if ('-' === substr($label, -1, 1)) { $info->errors \|= self::ERROR_TRAILING_HYPHEN; } } // Step 4. The label must not contain a U+002E (.) FULL STOP. if (false !== strpos($label, '.')) { $info->errors \|= self::ERROR_LABEL_HAS_DOT; } // Step 5. The label must not begin with a combining mark, that is: General_Category=Mark. if (1 === preg_match(Regex::COMBINING_MARK, $label)) { $info->errors \|= self::ERROR_LEADING_COMBINING_MARK; } // Step 6. Each code point in the label must only have certain status values according to // Section 5, IDNA Mapping Table: $transitional = $options['Transitional_Processing']; $useSTD3ASCIIRules = $options['UseSTD3ASCIIRules']; foreach ($codePoints as $codePoint) { $data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules); $status = $data['status']; if ('valid' === $status \|\| (!$transitional && 'deviation' === $status)) { continue; } $info->errors \|= self::ERROR_DISALLOWED; break; } // Step 7. If CheckJoiners, the label must satisify the ContextJ rules from Appendix A, in // The Unicode Code Points and Internationalized Domain Names for Applications (IDNA) // [IDNA2008]. if ($options['CheckJoiners'] && !self::isValidContextJ($codePoints, $label)) { $info->errors \|= self::ERROR_CONTEXTJ; } // Step 8. If CheckBidi, and if the domain name is a Bidi domain name, then the label must // satisfy all six of the numbered conditions in [IDNA2008] RFC 5893, Section 2. if ($options['CheckBidi'] && (!$info->bidiDomain \|\| $info->validBidiDomain)) { self::validateBidiLabel($label, $info); } } /* * @see https://tools.ietf.org/html/rfc3492#section-6.2 * * @param string $input * * @return string / private static function punycodeDecode($input) { $n = self::INITIAL_N; $out = 0; $i = 0; $bias = self::INITIAL_BIAS; $lastDelimIndex = strrpos($input, self::DELIMITER); $b = false === $lastDelimIndex ? 0 : $lastDelimIndex; $inputLength = \strlen($input); $output = []; $bytes = array_map('ord', str_split($input)); for ($j = 0; $j < $b; ++$j) { if ($bytes[$j] > 0x7F) { throw new Exception('Invalid input'); } $output[$out++] = $input[$j]; } if ($b > 0) { ++$b; } for ($in = $b; $in < $inputLength; ++$out) { $oldi = $i; $w = 1; for ($k = self::BASE; / no condition /; $k += self::BASE) { if ($in >= $inputLength) { throw new Exception('Invalid input'); } $digit = self::$basicToDigit[$bytes[$in++] & 0xFF]; if ($digit < 0) { throw new Exception('Invalid input'); } if ($digit > intdiv(self::MAX_INT - $i, $w)) { throw new Exception('Integer overflow'); } $i += $digit $w; if ($k <= $bias) { $t = self::TMIN; } elseif ($k >= $bias + self::TMAX) { $t = self::TMAX; } else { $t = $k - $bias; } if ($digit < $t) { break; } $baseMinusT = self::BASE - $t; if ($w > intdiv(self::MAX_INT, $baseMinusT)) { throw new Exception('Integer overflow'); } $w = $baseMinusT; } $outPlusOne = $out + 1; $bias = self::adaptBias($i - $oldi, $outPlusOne, 0 === $oldi); if (intdiv($i, $outPlusOne) > self::MAX_INT - $n) { throw new Exception('Integer overflow'); } $n += intdiv($i, $outPlusOne); $i %= $outPlusOne; array_splice($output, $i++, 0, [mb_chr($n, 'utf-8')]); } return implode('', $output); } /* * @see https://tools.ietf.org/html/rfc3492#section-6.3 * * @param string $input * * @return string / private static function punycodeEncode($input) { $n = self::INITIAL_N; $delta = 0; $out = 0; $bias = self::INITIAL_BIAS; $inputLength = 0; $output = ''; $iter = self::utf8Decode($input); foreach ($iter as $codePoint) { ++$inputLength; if ($codePoint < 0x80) { $output .= \chr($codePoint); ++$out; } } $h = $out; $b = $out; if ($b > 0) { $output .= self::DELIMITER; ++$out; } while ($h < $inputLength) { $m = self::MAX_INT; foreach ($iter as $codePoint) { if ($codePoint >= $n && $codePoint < $m) { $m = $codePoint; } } if ($m - $n > intdiv(self::MAX_INT - $delta, $h + 1)) { throw new Exception('Integer overflow'); } $delta += ($m - $n) ($h + 1); $n = $m; foreach ($iter as $codePoint) { if ($codePoint < $n && 0 === ++$delta) { throw new Exception('Integer overflow'); } if ($codePoint === $n) { $q = $delta; for ($k = self::BASE; /* no condition /; $k += self::BASE) { if ($k <= $bias) { $t = self::TMIN; } elseif ($k >= $bias + self::TMAX) { $t = self::TMAX; } else { $t = $k - $bias; } if ($q < $t) { break; } $qMinusT = $q - $t; $baseMinusT = self::BASE - $t; $output .= self::encodeDigit($t + ($qMinusT) % ($baseMinusT), false); ++$out; $q = intdiv($qMinusT, $baseMinusT); } $output .= self::encodeDigit($q, false); ++$out; $bias = self::adaptBias($delta, $h + 1, $h === $b); $delta = 0; ++$h; } } ++$delta; ++$n; } return $output; } /* * @see https://tools.ietf.org/html/rfc3492#section-6.1 * * @param int $delta * @param int $numPoints * @param bool $firstTime * * @return int / private static function adaptBias($delta, $numPoints, $firstTime) { // xxx >> 1 is a faster way of doing intdiv(xxx, 2) $delta = $firstTime ? intdiv($delta, self::DAMP) : $delta >> 1; $delta += intdiv($delta, $numPoints); $k = 0; while ($delta > ((self::BASE - self::TMIN) self::TMAX) >> 1) { $delta = intdiv($delta, self::BASE - self::TMIN); $k += self::BASE; } return $k + intdiv((self::BASE - self::TMIN + 1) * $delta, $delta + self::SKEW); } /** * @param int $d * @param bool $flag * * @return string / private static function encodeDigit($d, $flag) { return \chr($d + 22 + 75 ($d < 26 ? 1 : 0) - (($flag ? 1 : 0) << 5)); } /** * Takes a UTF-8 encoded string and converts it into a series of integer code points. Any * invalid byte sequences will be replaced by a U+FFFD replacement code point. * * @see https://encoding.spec.whatwg.org/#utf-8-decoder * * @param string $input * * @return array<int, int> / private static function utf8Decode($input) { $bytesSeen = 0; $bytesNeeded = 0; $lowerBoundary = 0x80; $upperBoundary = 0xBF; $codePoint = 0; $codePoints = []; $length = \strlen($input); for ($i = 0; $i < $length; ++$i) { $byte = \ord($input[$i]); if (0 === $bytesNeeded) { if ($byte >= 0x00 && $byte <= 0x7F) { $codePoints[] = $byte; continue; } if ($byte >= 0xC2 && $byte <= 0xDF) { $bytesNeeded = 1; $codePoint = $byte & 0x1F; } elseif ($byte >= 0xE0 && $byte <= 0xEF) { if (0xE0 === $byte) { $lowerBoundary = 0xA0; } elseif (0xED === $byte) { $upperBoundary = 0x9F; } $bytesNeeded = 2; $codePoint = $byte & 0xF; } elseif ($byte >= 0xF0 && $byte <= 0xF4) { if (0xF0 === $byte) { $lowerBoundary = 0x90; } elseif (0xF4 === $byte) { $upperBoundary = 0x8F; } $bytesNeeded = 3; $codePoint = $byte & 0x7; } else { $codePoints[] = 0xFFFD; } continue; } if ($byte < $lowerBoundary \|\| $byte > $upperBoundary) { $codePoint = 0; $bytesNeeded = 0; $bytesSeen = 0; $lowerBoundary = 0x80; $upperBoundary = 0xBF; --$i; $codePoints[] = 0xFFFD; continue; } $lowerBoundary = 0x80; $upperBoundary = 0xBF; $codePoint = ($codePoint << 6) \| ($byte & 0x3F); if (++$bytesSeen !== $bytesNeeded) { continue; } $codePoints[] = $codePoint; $codePoint = 0; $bytesNeeded = 0; $bytesSeen = 0; } // String unexpectedly ended, so append a U+FFFD code point. if (0 !== $bytesNeeded) { $codePoints[] = 0xFFFD; } return $codePoints; } /* * @param int $codePoint * @param bool $useSTD3ASCIIRules * * @return array{status: string, mapping?: string} */ private static function lookupCodePointStatus($codePoint, $useSTD3ASCIIRules) { if (!self::$mappingTableLoaded) { self::$mappingTableLoaded = true; self::$mapped = require __DIR__.'/Resources/unidata/mapped.php'; self::$ignored = require __DIR__.'/Resources/unidata/ignored.php'; self::$deviation = require __DIR__.'/Resources/unidata/deviation.php'; self::$disallowed = require __DIR__.'/Resources/unidata/disallowed.php'; self::$disallowed_STD3_mapped = require __DIR__.'/Resources/unidata/disallowed_STD3_mapped.php'; self::$disallowed_STD3_valid = require __DIR__.'/Resources/unidata/disallowed_STD3_valid.php'; } if (isset(self::$mapped[$codePoint])) { return ['status' => 'mapped', 'mapping' => self::$mapped[$codePoint]]; } if (isset(self::$ignored[$codePoint])) { return ['status' => 'ignored']; } if (isset(self::$deviation[$codePoint])) { return ['status' => 'deviation', 'mapping' => self::$deviation[$codePoint]]; } if (isset(self::$disallowed[$codePoint]) \|\| DisallowedRanges::inRange($codePoint)) { return ['status' => 'disallowed']; } $isDisallowedMapped = isset(self::$disallowed_STD3_mapped[$codePoint]); if ($isDisallowedMapped \|\| isset(self::$disallowed_STD3_valid[$codePoint])) { $status = 'disallowed'; if (!$useSTD3ASCIIRules) { $status = $isDisallowedMapped ? 'mapped' : 'valid'; } if ($isDisallowedMapped) { return ['status' => $status, 'mapping' => self::$disallowed_STD3_mapped[$codePoint]]; } return ['status' => $status]; } return ['status' => 'valid']; } } Back

Edit File : Idn.php | Size : 29.67 KB

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com> and Trevor Rowbotham <trevor.rowbotham@pm.me>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Polyfill\Intl\Idn;

use Exception;
use Normalizer;
use Symfony\Polyfill\Intl\Idn\Resources\unidata\DisallowedRanges;
use Symfony\Polyfill\Intl\Idn\Resources\unidata\Regex;

/**
 * @see https://www.unicode.org/reports/tr46/
 *
 * @internal
 */
final class Idn
{
    public const ERROR_EMPTY_LABEL = 1;
    public const ERROR_LABEL_TOO_LONG = 2;
    public const ERROR_DOMAIN_NAME_TOO_LONG = 4;
    public const ERROR_LEADING_HYPHEN = 8;
    public const ERROR_TRAILING_HYPHEN = 0x10;
    public const ERROR_HYPHEN_3_4 = 0x20;
    public const ERROR_LEADING_COMBINING_MARK = 0x40;
    public const ERROR_DISALLOWED = 0x80;
    public const ERROR_PUNYCODE = 0x100;
    public const ERROR_LABEL_HAS_DOT = 0x200;
    public const ERROR_INVALID_ACE_LABEL = 0x400;
    public const ERROR_BIDI = 0x800;
    public const ERROR_CONTEXTJ = 0x1000;
    public const ERROR_CONTEXTO_PUNCTUATION = 0x2000;
    public const ERROR_CONTEXTO_DIGITS = 0x4000;

public const INTL_IDNA_VARIANT_2003 = 0;
    public const INTL_IDNA_VARIANT_UTS46 = 1;

public const IDNA_DEFAULT = 0;
    public const IDNA_ALLOW_UNASSIGNED = 1;
    public const IDNA_USE_STD3_RULES = 2;
    public const IDNA_CHECK_BIDI = 4;
    public const IDNA_CHECK_CONTEXTJ = 8;
    public const IDNA_NONTRANSITIONAL_TO_ASCII = 16;
    public const IDNA_NONTRANSITIONAL_TO_UNICODE = 32;

public const MAX_DOMAIN_SIZE = 253;
    public const MAX_LABEL_SIZE = 63;

public const BASE = 36;
    public const TMIN = 1;
    public const TMAX = 26;
    public const SKEW = 38;
    public const DAMP = 700;
    public const INITIAL_BIAS = 72;
    public const INITIAL_N = 128;
    public const DELIMITER = '-';
    public const MAX_INT = 2147483647;

/**
     * Contains the numeric value of a basic code point (for use in representing integers) in the
     * range 0 to BASE-1, or -1 if b is does not represent a value.
     *
     * @var array<int, int>
     */
    private static $basicToDigit = [
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1,

-1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    ];

/**
     * @var array<int, int>
     */
    private static $virama;

/**
     * @var array<int, string>
     */
    private static $mapped;

/**
     * @var array<int, bool>
     */
    private static $ignored;

/**
     * @var array<int, string>
     */
    private static $deviation;

/**
     * @var array<int, bool>
     */
    private static $disallowed;

/**
     * @var array<int, string>
     */
    private static $disallowed_STD3_mapped;

/**
     * @var array<int, bool>
     */
    private static $disallowed_STD3_valid;

/**
     * @var bool
     */
    private static $mappingTableLoaded = false;

/**
     * @see https://www.unicode.org/reports/tr46/#ToASCII
     *
     * @param string $domainName
     * @param int    $options
     * @param int    $variant
     * @param array  $idna_info
     *
     * @return string|false
     */
    public static function idn_to_ascii($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
    {
        if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) {
            @trigger_error('idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
        }

$options = [
            'CheckHyphens' => true,
            'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 !== ($options & self::IDNA_CHECK_BIDI),
            'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ),
            'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES),
            'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_ASCII),
            'VerifyDnsLength' => true,
        ];
        $info = new Info();
        $labels = self::process((string) $domainName, $options, $info);

foreach ($labels as $i => $label) {
            // Only convert labels to punycode that contain non-ASCII code points
            if (1 === preg_match('/[^\x00-\x7F]/', $label)) {
                try {
                    $label = 'xn--'.self::punycodeEncode($label);
                } catch (Exception $e) {
                    $info->errors |= self::ERROR_PUNYCODE;
                }

$labels[$i] = $label;
            }
        }

if ($options['VerifyDnsLength']) {
            self::validateDomainAndLabelLength($labels, $info);
        }

$idna_info = [
            'result' => implode('.', $labels),
            'isTransitionalDifferent' => $info->transitionalDifferent,
            'errors' => $info->errors,
        ];

return 0 === $info->errors ? $idna_info['result'] : false;
    }

/**
     * @see https://www.unicode.org/reports/tr46/#ToUnicode
     *
     * @param string $domainName
     * @param int    $options
     * @param int    $variant
     * @param array  $idna_info
     *
     * @return string|false
     */
    public static function idn_to_utf8($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
    {
        if (\PHP_VERSION_ID >= 70200 && self::INTL_IDNA_VARIANT_2003 === $variant) {
            @trigger_error('idn_to_utf8(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
        }

$info = new Info();
        $labels = self::process((string) $domainName, [
            'CheckHyphens' => true,
            'CheckBidi' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 !== ($options & self::IDNA_CHECK_BIDI),
            'CheckJoiners' => self::INTL_IDNA_VARIANT_UTS46 === $variant && 0 !== ($options & self::IDNA_CHECK_CONTEXTJ),
            'UseSTD3ASCIIRules' => 0 !== ($options & self::IDNA_USE_STD3_RULES),
            'Transitional_Processing' => self::INTL_IDNA_VARIANT_2003 === $variant || 0 === ($options & self::IDNA_NONTRANSITIONAL_TO_UNICODE),
        ], $info);
        $idna_info = [
            'result' => implode('.', $labels),
            'isTransitionalDifferent' => $info->transitionalDifferent,
            'errors' => $info->errors,
        ];

return 0 === $info->errors ? $idna_info['result'] : false;
    }

/**
     * @param string $label
     *
     * @return bool
     */
    private static function isValidContextJ(array $codePoints, $label)
    {
        if (!isset(self::$virama)) {
            self::$virama = require __DIR__.\DIRECTORY_SEPARATOR.'Resources'.\DIRECTORY_SEPARATOR.'unidata'.\DIRECTORY_SEPARATOR.'virama.php';
        }

$offset = 0;

foreach ($codePoints as $i => $codePoint) {
            if (0x200C !== $codePoint && 0x200D !== $codePoint) {
                continue;
            }

if (!isset($codePoints[$i - 1])) {
                return false;
            }

// If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
            if (isset(self::$virama[$codePoints[$i - 1]])) {
                continue;
            }

// If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C(Joining_Type:T)*(Joining_Type:{R,D})) Then
            // True;
            // Generated RegExp = ([Joining_Type:{L,D}][Joining_Type:T]*\u200C[Joining_Type:T]*)[Joining_Type:{R,D}]
            if (0x200C === $codePoint && 1 === preg_match(Regex::ZWNJ, $label, $matches, \PREG_OFFSET_CAPTURE, $offset)) {
                $offset += \strlen($matches[1][0]);

continue;
            }

return false;
        }

return true;
    }

/**
     * @see https://www.unicode.org/reports/tr46/#ProcessingStepMap
     *
     * @param string              $input
     * @param array<string, bool> $options
     *
     * @return string
     */
    private static function mapCodePoints($input, array $options, Info $info)
    {
        $str = '';
        $useSTD3ASCIIRules = $options['UseSTD3ASCIIRules'];
        $transitional = $options['Transitional_Processing'];

foreach (self::utf8Decode($input) as $codePoint) {
            $data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules);

switch ($data['status']) {
                case 'disallowed':
                    $info->errors |= self::ERROR_DISALLOWED;

// no break.

case 'valid':
                    $str .= mb_chr($codePoint, 'utf-8');

break;

case 'ignored':
                    // Do nothing.
                    break;

case 'mapped':
                    $str .= $data['mapping'];

break;

case 'deviation':
                    $info->transitionalDifferent = true;
                    $str .= ($transitional ? $data['mapping'] : mb_chr($codePoint, 'utf-8'));

break;
            }
        }

return $str;
    }

/**
     * @see https://www.unicode.org/reports/tr46/#Processing
     *
     * @param string              $domain
     * @param array<string, bool> $options
     *
     * @return array<int, string>
     */
    private static function process($domain, array $options, Info $info)
    {
        // If VerifyDnsLength is not set, we are doing ToUnicode otherwise we are doing ToASCII and
        // we need to respect the VerifyDnsLength option.
        $checkForEmptyLabels = !isset($options['VerifyDnsLength']) || $options['VerifyDnsLength'];

if ($checkForEmptyLabels && '' === $domain) {
            $info->errors |= self::ERROR_EMPTY_LABEL;

return [$domain];
        }

// Step 1. Map each code point in the domain name string
        $domain = self::mapCodePoints($domain, $options, $info);

// Step 2. Normalize the domain name string to Unicode Normalization Form C.
        if (!Normalizer::isNormalized($domain, Normalizer::FORM_C)) {
            $domain = Normalizer::normalize($domain, Normalizer::FORM_C);
        }

// Step 3. Break the string into labels at U+002E (.) FULL STOP.
        $labels = explode('.', $domain);
        $lastLabelIndex = \count($labels) - 1;

// Step 4. Convert and validate each label in the domain name string.
        foreach ($labels as $i => $label) {
            $validationOptions = $options;

if ('xn--' === substr($label, 0, 4)) {
                try {
                    $label = self::punycodeDecode(substr($label, 4));
                } catch (Exception $e) {
                    $info->errors |= self::ERROR_PUNYCODE;

continue;
                }

$validationOptions['Transitional_Processing'] = false;
                $labels[$i] = $label;
            }

self::validateLabel($label, $info, $validationOptions, $i > 0 && $i === $lastLabelIndex);
        }

if ($info->bidiDomain && !$info->validBidiDomain) {
            $info->errors |= self::ERROR_BIDI;
        }

// Any input domain name string that does not record an error has been successfully
        // processed according to this specification. Conversely, if an input domain_name string
        // causes an error, then the processing of the input domain_name string fails. Determining
        // what to do with error input is up to the caller, and not in the scope of this document.
        return $labels;
    }

/**
     * @see https://tools.ietf.org/html/rfc5893#section-2
     *
     * @param string $label
     */
    private static function validateBidiLabel($label, Info $info)
    {
        if (1 === preg_match(Regex::RTL_LABEL, $label)) {
            $info->bidiDomain = true;

// Step 1. The first character must be a character with Bidi property L, R, or AL.
            // If it has the R or AL property, it is an RTL label
            if (1 !== preg_match(Regex::BIDI_STEP_1_RTL, $label)) {
                $info->validBidiDomain = false;

return;
            }

// Step 2. In an RTL label, only characters with the Bidi properties R, AL, AN, EN, ES,
            // CS, ET, ON, BN, or NSM are allowed.
            if (1 === preg_match(Regex::BIDI_STEP_2, $label)) {
                $info->validBidiDomain = false;

return;
            }

// Step 3. In an RTL label, the end of the label must be a character with Bidi property
            // R, AL, EN, or AN, followed by zero or more characters with Bidi property NSM.
            if (1 !== preg_match(Regex::BIDI_STEP_3, $label)) {
                $info->validBidiDomain = false;

return;
            }

// Step 4. In an RTL label, if an EN is present, no AN may be present, and vice versa.
            if (1 === preg_match(Regex::BIDI_STEP_4_AN, $label) && 1 === preg_match(Regex::BIDI_STEP_4_EN, $label)) {
                $info->validBidiDomain = false;

return;
            }

return;
        }

// We are a LTR label
        // Step 1. The first character must be a character with Bidi property L, R, or AL.
        // If it has the L property, it is an LTR label.
        if (1 !== preg_match(Regex::BIDI_STEP_1_LTR, $label)) {
            $info->validBidiDomain = false;

return;
        }

// Step 5. In an LTR label, only characters with the Bidi properties L, EN,
        // ES, CS, ET, ON, BN, or NSM are allowed.
        if (1 === preg_match(Regex::BIDI_STEP_5, $label)) {
            $info->validBidiDomain = false;

return;
        }

// Step 6.In an LTR label, the end of the label must be a character with Bidi property L or
        // EN, followed by zero or more characters with Bidi property NSM.
        if (1 !== preg_match(Regex::BIDI_STEP_6, $label)) {
            $info->validBidiDomain = false;

return;
        }
    }

/**
     * @param array<int, string> $labels
     */
    private static function validateDomainAndLabelLength(array $labels, Info $info)
    {
        $maxDomainSize = self::MAX_DOMAIN_SIZE;
        $length = \count($labels);

// Number of "." delimiters.
        $domainLength = $length - 1;

// If the last label is empty and it is not the first label, then it is the root label.
        // Increase the max size by 1, making it 254, to account for the root label's "."
        // delimiter. This also means we don't need to check the last label's length for being too
        // long.
        if ($length > 1 && '' === $labels[$length - 1]) {
            ++$maxDomainSize;
            --$length;
        }

for ($i = 0; $i < $length; ++$i) {
            $bytes = \strlen($labels[$i]);
            $domainLength += $bytes;

if ($bytes > self::MAX_LABEL_SIZE) {
                $info->errors |= self::ERROR_LABEL_TOO_LONG;
            }
        }

if ($domainLength > $maxDomainSize) {
            $info->errors |= self::ERROR_DOMAIN_NAME_TOO_LONG;
        }
    }

/**
     * @see https://www.unicode.org/reports/tr46/#Validity_Criteria
     *
     * @param string              $label
     * @param array<string, bool> $options
     * @param bool                $canBeEmpty
     */
    private static function validateLabel($label, Info $info, array $options, $canBeEmpty)
    {
        if ('' === $label) {
            if (!$canBeEmpty && (!isset($options['VerifyDnsLength']) || $options['VerifyDnsLength'])) {
                $info->errors |= self::ERROR_EMPTY_LABEL;
            }

return;
        }

// Step 1. The label must be in Unicode Normalization Form C.
        if (!Normalizer::isNormalized($label, Normalizer::FORM_C)) {
            $info->errors |= self::ERROR_INVALID_ACE_LABEL;
        }

$codePoints = self::utf8Decode($label);

if ($options['CheckHyphens']) {
            // Step 2. If CheckHyphens, the label must not contain a U+002D HYPHEN-MINUS character
            // in both the thrid and fourth positions.
            if (isset($codePoints[2], $codePoints[3]) && 0x002D === $codePoints[2] && 0x002D === $codePoints[3]) {
                $info->errors |= self::ERROR_HYPHEN_3_4;
            }

// Step 3. If CheckHyphens, the label must neither begin nor end with a U+002D
            // HYPHEN-MINUS character.
            if ('-' === substr($label, 0, 1)) {
                $info->errors |= self::ERROR_LEADING_HYPHEN;
            }

if ('-' === substr($label, -1, 1)) {
                $info->errors |= self::ERROR_TRAILING_HYPHEN;
            }
        }

// Step 4. The label must not contain a U+002E (.) FULL STOP.
        if (false !== strpos($label, '.')) {
            $info->errors |= self::ERROR_LABEL_HAS_DOT;
        }

// Step 5. The label must not begin with a combining mark, that is: General_Category=Mark.
        if (1 === preg_match(Regex::COMBINING_MARK, $label)) {
            $info->errors |= self::ERROR_LEADING_COMBINING_MARK;
        }

// Step 6. Each code point in the label must only have certain status values according to
        // Section 5, IDNA Mapping Table:
        $transitional = $options['Transitional_Processing'];
        $useSTD3ASCIIRules = $options['UseSTD3ASCIIRules'];

foreach ($codePoints as $codePoint) {
            $data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules);
            $status = $data['status'];

if ('valid' === $status || (!$transitional && 'deviation' === $status)) {
                continue;
            }

$info->errors |= self::ERROR_DISALLOWED;

break;
        }

// Step 7. If CheckJoiners, the label must satisify the ContextJ rules from Appendix A, in
        // The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)
        // [IDNA2008].
        if ($options['CheckJoiners'] && !self::isValidContextJ($codePoints, $label)) {
            $info->errors |= self::ERROR_CONTEXTJ;
        }

// Step 8. If CheckBidi, and if the domain name is a  Bidi domain name, then the label must
        // satisfy all six of the numbered conditions in [IDNA2008] RFC 5893, Section 2.
        if ($options['CheckBidi'] && (!$info->bidiDomain || $info->validBidiDomain)) {
            self::validateBidiLabel($label, $info);
        }
    }

/**
     * @see https://tools.ietf.org/html/rfc3492#section-6.2
     *
     * @param string $input
     *
     * @return string
     */
    private static function punycodeDecode($input)
    {
        $n = self::INITIAL_N;
        $out = 0;
        $i = 0;
        $bias = self::INITIAL_BIAS;
        $lastDelimIndex = strrpos($input, self::DELIMITER);
        $b = false === $lastDelimIndex ? 0 : $lastDelimIndex;
        $inputLength = \strlen($input);
        $output = [];
        $bytes = array_map('ord', str_split($input));

for ($j = 0; $j < $b; ++$j) {
            if ($bytes[$j] > 0x7F) {
                throw new Exception('Invalid input');
            }

$output[$out++] = $input[$j];
        }

if ($b > 0) {
            ++$b;
        }

for ($in = $b; $in < $inputLength; ++$out) {
            $oldi = $i;
            $w = 1;

for ($k = self::BASE; /* no condition */; $k += self::BASE) {
                if ($in >= $inputLength) {
                    throw new Exception('Invalid input');
                }

$digit = self::$basicToDigit[$bytes[$in++] & 0xFF];

if ($digit < 0) {
                    throw new Exception('Invalid input');
                }

if ($digit > intdiv(self::MAX_INT - $i, $w)) {
                    throw new Exception('Integer overflow');
                }

$i += $digit * $w;

if ($k <= $bias) {
                    $t = self::TMIN;
                } elseif ($k >= $bias + self::TMAX) {
                    $t = self::TMAX;
                } else {
                    $t = $k - $bias;
                }

if ($digit < $t) {
                    break;
                }

$baseMinusT = self::BASE - $t;

if ($w > intdiv(self::MAX_INT, $baseMinusT)) {
                    throw new Exception('Integer overflow');
                }

$w *= $baseMinusT;
            }

$outPlusOne = $out + 1;
            $bias = self::adaptBias($i - $oldi, $outPlusOne, 0 === $oldi);

if (intdiv($i, $outPlusOne) > self::MAX_INT - $n) {
                throw new Exception('Integer overflow');
            }

$n += intdiv($i, $outPlusOne);
            $i %= $outPlusOne;
            array_splice($output, $i++, 0, [mb_chr($n, 'utf-8')]);
        }

return implode('', $output);
    }

/**
     * @see https://tools.ietf.org/html/rfc3492#section-6.3
     *
     * @param string $input
     *
     * @return string
     */
    private static function punycodeEncode($input)
    {
        $n = self::INITIAL_N;
        $delta = 0;
        $out = 0;
        $bias = self::INITIAL_BIAS;
        $inputLength = 0;
        $output = '';
        $iter = self::utf8Decode($input);

foreach ($iter as $codePoint) {
            ++$inputLength;

if ($codePoint < 0x80) {
                $output .= \chr($codePoint);
                ++$out;
            }
        }

$h = $out;
        $b = $out;

if ($b > 0) {
            $output .= self::DELIMITER;
            ++$out;
        }

while ($h < $inputLength) {
            $m = self::MAX_INT;

foreach ($iter as $codePoint) {
                if ($codePoint >= $n && $codePoint < $m) {
                    $m = $codePoint;
                }
            }

if ($m - $n > intdiv(self::MAX_INT - $delta, $h + 1)) {
                throw new Exception('Integer overflow');
            }

$delta += ($m - $n) * ($h + 1);
            $n = $m;

foreach ($iter as $codePoint) {
                if ($codePoint < $n && 0 === ++$delta) {
                    throw new Exception('Integer overflow');
                }

if ($codePoint === $n) {
                    $q = $delta;

for ($k = self::BASE; /* no condition */; $k += self::BASE) {
                        if ($k <= $bias) {
                            $t = self::TMIN;
                        } elseif ($k >= $bias + self::TMAX) {
                            $t = self::TMAX;
                        } else {
                            $t = $k - $bias;
                        }

if ($q < $t) {
                            break;
                        }

$qMinusT = $q - $t;
                        $baseMinusT = self::BASE - $t;
                        $output .= self::encodeDigit($t + ($qMinusT) % ($baseMinusT), false);
                        ++$out;
                        $q = intdiv($qMinusT, $baseMinusT);
                    }

$output .= self::encodeDigit($q, false);
                    ++$out;
                    $bias = self::adaptBias($delta, $h + 1, $h === $b);
                    $delta = 0;
                    ++$h;
                }
            }

++$delta;
            ++$n;
        }

return $output;
    }

/**
     * @see https://tools.ietf.org/html/rfc3492#section-6.1
     *
     * @param int  $delta
     * @param int  $numPoints
     * @param bool $firstTime
     *
     * @return int
     */
    private static function adaptBias($delta, $numPoints, $firstTime)
    {
        // xxx >> 1 is a faster way of doing intdiv(xxx, 2)
        $delta = $firstTime ? intdiv($delta, self::DAMP) : $delta >> 1;
        $delta += intdiv($delta, $numPoints);
        $k = 0;

while ($delta > ((self::BASE - self::TMIN) * self::TMAX) >> 1) {
            $delta = intdiv($delta, self::BASE - self::TMIN);
            $k += self::BASE;
        }

return $k + intdiv((self::BASE - self::TMIN + 1) * $delta, $delta + self::SKEW);
    }

/**
     * @param int  $d
     * @param bool $flag
     *
     * @return string
     */
    private static function encodeDigit($d, $flag)
    {
        return \chr($d + 22 + 75 * ($d < 26 ? 1 : 0) - (($flag ? 1 : 0) << 5));
    }

/**
     * Takes a UTF-8 encoded string and converts it into a series of integer code points. Any
     * invalid byte sequences will be replaced by a U+FFFD replacement code point.
     *
     * @see https://encoding.spec.whatwg.org/#utf-8-decoder
     *
     * @param string $input
     *
     * @return array<int, int>
     */
    private static function utf8Decode($input)
    {
        $bytesSeen = 0;
        $bytesNeeded = 0;
        $lowerBoundary = 0x80;
        $upperBoundary = 0xBF;
        $codePoint = 0;
        $codePoints = [];
        $length = \strlen($input);

for ($i = 0; $i < $length; ++$i) {
            $byte = \ord($input[$i]);

if (0 === $bytesNeeded) {
                if ($byte >= 0x00 && $byte <= 0x7F) {
                    $codePoints[] = $byte;

continue;
                }

if ($byte >= 0xC2 && $byte <= 0xDF) {
                    $bytesNeeded = 1;
                    $codePoint = $byte & 0x1F;
                } elseif ($byte >= 0xE0 && $byte <= 0xEF) {
                    if (0xE0 === $byte) {
                        $lowerBoundary = 0xA0;
                    } elseif (0xED === $byte) {
                        $upperBoundary = 0x9F;
                    }

$bytesNeeded = 2;
                    $codePoint = $byte & 0xF;
                } elseif ($byte >= 0xF0 && $byte <= 0xF4) {
                    if (0xF0 === $byte) {
                        $lowerBoundary = 0x90;
                    } elseif (0xF4 === $byte) {
                        $upperBoundary = 0x8F;
                    }

$bytesNeeded = 3;
                    $codePoint = $byte & 0x7;
                } else {
                    $codePoints[] = 0xFFFD;
                }

continue;
            }

if ($byte < $lowerBoundary || $byte > $upperBoundary) {
                $codePoint = 0;
                $bytesNeeded = 0;
                $bytesSeen = 0;
                $lowerBoundary = 0x80;
                $upperBoundary = 0xBF;
                --$i;
                $codePoints[] = 0xFFFD;

continue;
            }

$lowerBoundary = 0x80;
            $upperBoundary = 0xBF;
            $codePoint = ($codePoint << 6) | ($byte & 0x3F);

if (++$bytesSeen !== $bytesNeeded) {
                continue;
            }

$codePoints[] = $codePoint;
            $codePoint = 0;
            $bytesNeeded = 0;
            $bytesSeen = 0;
        }

// String unexpectedly ended, so append a U+FFFD code point.
        if (0 !== $bytesNeeded) {
            $codePoints[] = 0xFFFD;
        }

return $codePoints;
    }

/**
     * @param int  $codePoint
     * @param bool $useSTD3ASCIIRules
     *
     * @return array{status: string, mapping?: string}
     */
    private static function lookupCodePointStatus($codePoint, $useSTD3ASCIIRules)
    {
        if (!self::$mappingTableLoaded) {
            self::$mappingTableLoaded = true;
            self::$mapped = require __DIR__.'/Resources/unidata/mapped.php';
            self::$ignored = require __DIR__.'/Resources/unidata/ignored.php';
            self::$deviation = require __DIR__.'/Resources/unidata/deviation.php';
            self::$disallowed = require __DIR__.'/Resources/unidata/disallowed.php';
            self::$disallowed_STD3_mapped = require __DIR__.'/Resources/unidata/disallowed_STD3_mapped.php';
            self::$disallowed_STD3_valid = require __DIR__.'/Resources/unidata/disallowed_STD3_valid.php';
        }

if (isset(self::$mapped[$codePoint])) {
            return ['status' => 'mapped', 'mapping' => self::$mapped[$codePoint]];
        }

if (isset(self::$ignored[$codePoint])) {
            return ['status' => 'ignored'];
        }

if (isset(self::$deviation[$codePoint])) {
            return ['status' => 'deviation', 'mapping' => self::$deviation[$codePoint]];
        }

if (isset(self::$disallowed[$codePoint]) || DisallowedRanges::inRange($codePoint)) {
            return ['status' => 'disallowed'];
        }

$isDisallowedMapped = isset(self::$disallowed_STD3_mapped[$codePoint]);

if ($isDisallowedMapped || isset(self::$disallowed_STD3_valid[$codePoint])) {
            $status = 'disallowed';

if (!$useSTD3ASCIIRules) {
                $status = $isDisallowedMapped ? 'mapped' : 'valid';
            }

if ($isDisallowedMapped) {
                return ['status' => $status, 'mapping' => self::$disallowed_STD3_mapped[$codePoint]];
            }

return ['status' => $status];
        }

return ['status' => 'valid'];
    }
}

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