94 lines
3.1 KiB
PHP
94 lines
3.1 KiB
PHP
<?php
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namespace Ratchet\WebSocket\Encoding;
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/**
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* This class handled encoding validation
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*/
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class Validator {
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const UTF8_ACCEPT = 0;
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const UTF8_REJECT = 1;
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/**
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* Incremental UTF-8 validator with constant memory consumption (minimal state).
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*
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* Implements the algorithm "Flexible and Economical UTF-8 Decoder" by
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* Bjoern Hoehrmann (http://bjoern.hoehrmann.de/utf-8/decoder/dfa/).
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*/
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protected static $dfa = array(
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, # 00..1f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, # 20..3f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, # 40..5f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, # 60..7f
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, # 80..9f
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, # a0..bf
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, # c0..df
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0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, # e0..ef
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0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, # f0..ff
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0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, # s0..s0
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, # s1..s2
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1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, # s3..s4
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1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, # s5..s6
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1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, # s7..s8
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);
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/**
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* Lookup if mbstring is available
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* @var bool
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*/
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private $hasMbString = false;
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/**
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* Lookup if iconv is available
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* @var bool
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*/
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private $hasIconv = false;
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public function __construct() {
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$this->hasMbString = extension_loaded('mbstring');
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$this->hasIconv = extension_loaded('iconv');
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}
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/**
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* @param string $str The value to check the encoding
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* @param string $against The type of encoding to check against
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* @return bool
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*/
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public function checkEncoding($str, $against) {
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if ('UTF-8' == $against) {
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return $this->isUtf8($str);
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}
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if ($this->hasMbString) {
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return mb_check_encoding($str, $against);
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} elseif ($this->hasIconv) {
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return ($str == iconv($against, "{$against}//IGNORE", $str));
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}
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return true;
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}
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protected function isUtf8($str) {
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if ($this->hasMbString) {
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if (false === mb_check_encoding($str, 'UTF-8')) {
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return false;
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}
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} elseif ($this->hasIconv) {
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if ($str != iconv('UTF-8', 'UTF-8//IGNORE', $str)) {
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return false;
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}
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}
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$state = static::UTF8_ACCEPT;
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for ($i = 0, $len = strlen($str); $i < $len; $i++) {
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$state = static::$dfa[256 + ($state << 4) + static::$dfa[ord($str[$i])]];
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if (static::UTF8_REJECT === $state) {
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return false;
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}
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}
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return true;
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}
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}
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