<?php

namespace WPForms\Vendor;

/**
 * A UTF-8 specific character encoder that handles cleaning and transforming.
 * @note All functions in this class should be static.
 */
class HTMLPurifier_Encoder
{
    /**
     * Constructor throws fatal error if you attempt to instantiate class
     */
    private function __construct()
    {
        \trigger_error('Cannot instantiate encoder, call methods statically', \E_USER_ERROR);
    }
    /**
     * Error-handler that mutes errors, alternative to shut-up operator.
     */
    public static function muteErrorHandler()
    {
    }
    /**
     * iconv wrapper which mutes errors, but doesn't work around bugs.
     * @param string $in Input encoding
     * @param string $out Output encoding
     * @param string $text The text to convert
     * @return string
     */
    public static function unsafeIconv($in, $out, $text)
    {
        \set_error_handler(array('WPForms\Vendor\HTMLPurifier_Encoder', 'muteErrorHandler'));
        $r = \iconv($in, $out, $text);
        \restore_error_handler();
        return $r;
    }
    /**
     * iconv wrapper which mutes errors and works around bugs.
     * @param string $in Input encoding
     * @param string $out Output encoding
     * @param string $text The text to convert
     * @param int $max_chunk_size
     * @return string
     */
    public static function iconv($in, $out, $text, $max_chunk_size = 8000)
    {
        $code = self::testIconvTruncateBug();
        if ($code == self::ICONV_OK) {
            return self::unsafeIconv($in, $out, $text);
        } elseif ($code == self::ICONV_TRUNCATES) {
            // we can only work around this if the input character set
            // is utf-8
            if ($in == 'utf-8') {
                if ($max_chunk_size < 4) {
                    \trigger_error('max_chunk_size is too small', \E_USER_WARNING);
                    return \false;
                }
                // split into 8000 byte chunks, but be careful to handle
                // multibyte boundaries properly
                if (($c = \strlen($text)) <= $max_chunk_size) {
                    return self::unsafeIconv($in, $out, $text);
                }
                $r = '';
                $i = 0;
                while (\true) {
                    if ($i + $max_chunk_size >= $c) {
                        $r .= self::unsafeIconv($in, $out, \substr($text, $i));
                        break;
                    }
                    // wibble the boundary
                    if (0x80 != (0xc0 & \ord($text[$i + $max_chunk_size]))) {
                        $chunk_size = $max_chunk_size;
                    } elseif (0x80 != (0xc0 & \ord($text[$i + $max_chunk_size - 1]))) {
                        $chunk_size = $max_chunk_size - 1;
                    } elseif (0x80 != (0xc0 & \ord($text[$i + $max_chunk_size - 2]))) {
                        $chunk_size = $max_chunk_size - 2;
                    } elseif (0x80 != (0xc0 & \ord($text[$i + $max_chunk_size - 3]))) {
                        $chunk_size = $max_chunk_size - 3;
                    } else {
                        return \false;
                        // rather confusing UTF-8...
                    }
                    $chunk = \substr($text, $i, $chunk_size);
                    // substr doesn't mind overlong lengths
                    $r .= self::unsafeIconv($in, $out, $chunk);
                    $i += $chunk_size;
                }
                return $r;
            } else {
                return \false;
            }
        } else {
            return \false;
        }
    }
    /**
     * Cleans a UTF-8 string for well-formedness and SGML validity
     *
     * It will parse according to UTF-8 and return a valid UTF8 string, with
     * non-SGML codepoints excluded.
     *
     * Specifically, it will permit:
     * \x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}
     * Source: https://www.w3.org/TR/REC-xml/#NT-Char
     * Arguably this function should be modernized to the HTML5 set
     * of allowed characters:
     * https://www.w3.org/TR/html5/syntax.html#preprocessing-the-input-stream
     * which simultaneously expand and restrict the set of allowed characters.
     *
     * @param string $str The string to clean
     * @param bool $force_php
     * @return string
     *
     * @note Just for reference, the non-SGML code points are 0 to 31 and
     *       127 to 159, inclusive.  However, we allow code points 9, 10
     *       and 13, which are the tab, line feed and carriage return
     *       respectively. 128 and above the code points map to multibyte
     *       UTF-8 representations.
     *
     * @note Fallback code adapted from utf8ToUnicode by Henri Sivonen and
     *       hsivonen@iki.fi at <http://iki.fi/hsivonen/php-utf8/> under the
     *       LGPL license.  Notes on what changed are inside, but in general,
     *       the original code transformed UTF-8 text into an array of integer
     *       Unicode codepoints. Understandably, transforming that back to
     *       a string would be somewhat expensive, so the function was modded to
     *       directly operate on the string.  However, this discourages code
     *       reuse, and the logic enumerated here would be useful for any
     *       function that needs to be able to understand UTF-8 characters.
     *       As of right now, only smart lossless character encoding converters
     *       would need that, and I'm probably not going to implement them.
     */
    public static function cleanUTF8($str, $force_php = \false)
    {
        // UTF-8 validity is checked since PHP 4.3.5
        // This is an optimization: if the string is already valid UTF-8, no
        // need to do PHP stuff. 99% of the time, this will be the case.
        if (\preg_match('/^[\\x{9}\\x{A}\\x{D}\\x{20}-\\x{7E}\\x{A0}-\\x{D7FF}\\x{E000}-\\x{FFFD}\\x{10000}-\\x{10FFFF}]*$/Du', $str)) {
            return $str;
        }
        $mState = 0;
        // cached expected number of octets after the current octet
        // until the beginning of the next UTF8 character sequence
        $mUcs4 = 0;
        // cached Unicode character
        $mBytes = 1;
        // cached expected number of octets in the current sequence
        // original code involved an $out that was an array of Unicode
        // codepoints.  Instead of having to convert back into UTF-8, we've
        // decided to directly append valid UTF-8 characters onto a string
        // $out once they're done.  $char accumulates raw bytes, while $mUcs4
        // turns into the Unicode code point, so there's some redundancy.
        $out = '';
        $char = '';
        $len = \strlen($str);
        for ($i = 0; $i < $len; $i++) {
            $in = \ord($str[$i]);
            $char .= $str[$i];
            // append byte to char
            if (0 == $mState) {
                // When mState is zero we expect either a US-ASCII character
                // or a multi-octet sequence.
                if (0 == (0x80 & $in)) {
                    // US-ASCII, pass straight through.
                    if (($in <= 31 || $in == 127) && !($in == 9 || $in == 13 || $in == 10)) {
                        // control characters, remove
                    } else {
                        $out .= $char;
                    }
                    // reset
                    $char = '';
                    $mBytes = 1;
                } elseif (0xc0 == (0xe0 & $in)) {
                    // First octet of 2 octet sequence
                    $mUcs4 = $in;
                    $mUcs4 = ($mUcs4 & 0x1f) << 6;
                    $mState = 1;
                    $mBytes = 2;
                } elseif (0xe0 == (0xf0 & $in)) {
                    // First octet of 3 octet sequence
                    $mUcs4 = $in;
                    $mUcs4 = ($mUcs4 & 0xf) << 12;
                    $mState = 2;
                    $mBytes = 3;
                } elseif (0xf0 == (0xf8 & $in)) {
                    // First octet of 4 octet sequence
                    $mUcs4 = $in;
                    $mUcs4 = ($mUcs4 & 0x7) << 18;
                    $mState = 3;
                    $mBytes = 4;
                } elseif (0xf8 == (0xfc & $in)) {
                    // First octet of 5 octet sequence.
                    //
                    // This is illegal because the encoded codepoint must be
                    // either:
                    // (a) not the shortest form or
                    // (b) outside the Unicode range of 0-0x10FFFF.
                    // Rather than trying to resynchronize, we will carry on
                    // until the end of the sequence and let the later error
                    // handling code catch it.
                    $mUcs4 = $in;
                    $mUcs4 = ($mUcs4 & 0x3) << 24;
                    $mState = 4;
                    $mBytes = 5;
                } elseif (0xfc == (0xfe & $in)) {
                    // First octet of 6 octet sequence, see comments for 5
                    // octet sequence.
                    $mUcs4 = $in;
                    $mUcs4 = ($mUcs4 & 1) << 30;
                    $mState = 5;
                    $mBytes = 6;
                } else {
                    // Current octet is neither in the US-ASCII range nor a
                    // legal first octet of a multi-octet sequence.
                    $mState = 0;
                    $mUcs4 = 0;
                    $mBytes = 1;
                    $char = '';
                }
            } else {
                // When mState is non-zero, we expect a continuation of the
                // multi-octet sequence
                if (0x80 == (0xc0 & $in)) {
                    // Legal continuation.
                    $shift = ($mState - 1) * 6;
                    $tmp = $in;
                    $tmp = ($tmp & 0x3f) << $shift;
                    $mUcs4 |= $tmp;
                    if (0 == --$mState) {
                        // End of the multi-octet sequence. mUcs4 now contains
                        // the final Unicode codepoint to be output
                        // Check for illegal sequences and codepoints.
                        // From Unicode 3.1, non-shortest form is illegal
                        if (2 == $mBytes && $mUcs4 < 0x80 || 3 == $mBytes && $mUcs4 < 0x800 || 4 == $mBytes && $mUcs4 < 0x10000 || 4 < $mBytes || ($mUcs4 & 0xfffff800) == 0xd800 || $mUcs4 > 0x10ffff) {
                        } elseif (0xfeff != $mUcs4 && (0x9 == $mUcs4 || 0xa == $mUcs4 || 0xd == $mUcs4 || 0x20 <= $mUcs4 && 0x7e >= $mUcs4 || 0xa0 <= $mUcs4 && 0xd7ff >= $mUcs4 || 0xe000 <= $mUcs4 && 0xfffd >= $mUcs4 || 0x10000 <= $mUcs4 && 0x10ffff >= $mUcs4)) {
                            $out .= $char;
                        }
                        // initialize UTF8 cache (reset)
                        $mState = 0;
                        $mUcs4 = 0;
                        $mBytes = 1;
                        $char = '';
                    }
                } else {
                    // ((0xC0 & (*in) != 0x80) && (mState != 0))
                    // Incomplete multi-octet sequence.
                    // used to result in complete fail, but we'll reset
                    $mState = 0;
                    $mUcs4 = 0;
                    $mBytes = 1;
                    $char = '';
                }
            }
        }
        return $out;
    }
    /**
     * Translates a Unicode codepoint into its corresponding UTF-8 character.
     * @note Based on Feyd's function at
     *       <http://forums.devnetwork.net/viewtopic.php?p=191404#191404>,
     *       which is in public domain.
     * @note While we're going to do code point parsing anyway, a good
     *       optimization would be to refuse to translate code points that
     *       are non-SGML characters.  However, this could lead to duplication.
     * @note This is very similar to the unichr function in
     *       maintenance/generate-entity-file.php (although this is superior,
     *       due to its sanity checks).
     */
    // +----------+----------+----------+----------+
    // | 33222222 | 22221111 | 111111   |          |
    // | 10987654 | 32109876 | 54321098 | 76543210 | bit
    // +----------+----------+----------+----------+
    // |          |          |          | 0xxxxxxx | 1 byte 0x00000000..0x0000007F
    // |          |          | 110yyyyy | 10xxxxxx | 2 byte 0x00000080..0x000007FF
    // |          | 1110zzzz | 10yyyyyy | 10xxxxxx | 3 byte 0x00000800..0x0000FFFF
    // | 11110www | 10wwzzzz | 10yyyyyy | 10xxxxxx | 4 byte 0x00010000..0x0010FFFF
    // +----------+----------+----------+----------+
    // | 00000000 | 00011111 | 11111111 | 11111111 | Theoretical upper limit of legal scalars: 2097151 (0x001FFFFF)
    // | 00000000 | 00010000 | 11111111 | 11111111 | Defined upper limit of legal scalar codes
    // +----------+----------+----------+----------+
    public static function unichr($code)
    {
        if ($code > 1114111 or $code < 0 or $code >= 55296 and $code <= 57343) {
            // bits are set outside the "valid" range as defined
            // by UNICODE 4.1.0
            return '';
        }
        $x = $y = $z = $w = 0;
        if ($code < 128) {
            // regular ASCII character
            $x = $code;
        } else {
            // set up bits for UTF-8
            $x = $code & 63 | 128;
            if ($code < 2048) {
                $y = ($code & 2047) >> 6 | 192;
            } else {
                $y = ($code & 4032) >> 6 | 128;
                if ($code < 65536) {
                    $z = $code >> 12 & 15 | 224;
                } else {
                    $z = $code >> 12 & 63 | 128;
                    $w = $code >> 18 & 7 | 240;
                }
            }
        }
        // set up the actual character
        $ret = '';
        if ($w) {
            $ret .= \chr($w);
        }
        if ($z) {
            $ret .= \chr($z);
        }
        if ($y) {
            $ret .= \chr($y);
        }
        $ret .= \chr($x);
        return $ret;
    }
    /**
     * @return bool
     */
    public static function iconvAvailable()
    {
        static $iconv = null;
        if ($iconv === null) {
            $iconv = \function_exists('iconv') && self::testIconvTruncateBug() != self::ICONV_UNUSABLE;
        }
        return $iconv;
    }
    /**
     * Convert a string to UTF-8 based on configuration.
     * @param string $str The string to convert
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return string
     */
    public static function convertToUTF8($str, $config, $context)
    {
        $encoding = $config->get('Core.Encoding');
        if ($encoding === 'utf-8') {
            return $str;
        }
        static $iconv = null;
        if ($iconv === null) {
            $iconv = self::iconvAvailable();
        }
        if ($iconv && !$config->get('Test.ForceNoIconv')) {
            // unaffected by bugs, since UTF-8 support all characters
            $str = self::unsafeIconv($encoding, 'utf-8//IGNORE', $str);
            if ($str === \false) {
                // $encoding is not a valid encoding
                \trigger_error('Invalid encoding ' . $encoding, \E_USER_ERROR);
                return '';
            }
            // If the string is bjorked by Shift_JIS or a similar encoding
            // that doesn't support all of ASCII, convert the naughty
            // characters to their true byte-wise ASCII/UTF-8 equivalents.
            $str = \strtr($str, self::testEncodingSupportsASCII($encoding));
            return $str;
        } elseif ($encoding === 'iso-8859-1' && \function_exists('mb_convert_encoding')) {
            $str = \mb_convert_encoding($str, 'UTF-8', 'ISO-8859-1');
            return $str;
        }
        $bug = HTMLPurifier_Encoder::testIconvTruncateBug();
        if ($bug == self::ICONV_OK) {
            \trigger_error('Encoding not supported, please install iconv', \E_USER_ERROR);
        } else {
            \trigger_error('You have a buggy version of iconv, see https://bugs.php.net/bug.php?id=48147 ' . 'and http://sourceware.org/bugzilla/show_bug.cgi?id=13541', \E_USER_ERROR);
        }
    }
    /**
     * Converts a string from UTF-8 based on configuration.
     * @param string $str The string to convert
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return string
     * @note Currently, this is a lossy conversion, with unexpressable
     *       characters being omitted.
     */
    public static function convertFromUTF8($str, $config, $context)
    {
        $encoding = $config->get('Core.Encoding');
        if ($escape = $config->get('Core.EscapeNonASCIICharacters')) {
            $str = self::convertToASCIIDumbLossless($str);
        }
        if ($encoding === 'utf-8') {
            return $str;
        }
        static $iconv = null;
        if ($iconv === null) {
            $iconv = self::iconvAvailable();
        }
        if ($iconv && !$config->get('Test.ForceNoIconv')) {
            // Undo our previous fix in convertToUTF8, otherwise iconv will barf
            $ascii_fix = self::testEncodingSupportsASCII($encoding);
            if (!$escape && !empty($ascii_fix)) {
                $clear_fix = array();
                foreach ($ascii_fix as $utf8 => $native) {
                    $clear_fix[$utf8] = '';
                }
                $str = \strtr($str, $clear_fix);
            }
            $str = \strtr($str, \array_flip($ascii_fix));
            // Normal stuff
            $str = self::iconv('utf-8', $encoding . '//IGNORE', $str);
            return $str;
        } elseif ($encoding === 'iso-8859-1' && \function_exists('mb_convert_encoding')) {
            $str = \mb_convert_encoding($str, 'ISO-8859-1', 'UTF-8');
            return $str;
        }
        \trigger_error('Encoding not supported', \E_USER_ERROR);
        // You might be tempted to assume that the ASCII representation
        // might be OK, however, this is *not* universally true over all
        // encodings.  So we take the conservative route here, rather
        // than forcibly turn on %Core.EscapeNonASCIICharacters
    }
    /**
     * Lossless (character-wise) conversion of HTML to ASCII
     * @param string $str UTF-8 string to be converted to ASCII
     * @return string ASCII encoded string with non-ASCII character entity-ized
     * @warning Adapted from MediaWiki, claiming fair use: this is a common
     *       algorithm. If you disagree with this license fudgery,
     *       implement it yourself.
     * @note Uses decimal numeric entities since they are best supported.
     * @note This is a DUMB function: it has no concept of keeping
     *       character entities that the projected character encoding
     *       can allow. We could possibly implement a smart version
     *       but that would require it to also know which Unicode
     *       codepoints the charset supported (not an easy task).
     * @note Sort of with cleanUTF8() but it assumes that $str is
     *       well-formed UTF-8
     */
    public static function convertToASCIIDumbLossless($str)
    {
        $bytesleft = 0;
        $result = '';
        $working = 0;
        $len = \strlen($str);
        for ($i = 0; $i < $len; $i++) {
            $bytevalue = \ord($str[$i]);
            if ($bytevalue <= 0x7f) {
                //0xxx xxxx
                $result .= \chr($bytevalue);
                $bytesleft = 0;
            } elseif ($bytevalue <= 0xbf) {
                //10xx xxxx
                $working = $working << 6;
                $working += $bytevalue & 0x3f;
                $bytesleft--;
                if ($bytesleft <= 0) {
                    $result .= "&#" . $working . ";";
                }
            } elseif ($bytevalue <= 0xdf) {
                //110x xxxx
                $working = $bytevalue & 0x1f;
                $bytesleft = 1;
            } elseif ($bytevalue <= 0xef) {
                //1110 xxxx
                $working = $bytevalue & 0xf;
                $bytesleft = 2;
            } else {
                //1111 0xxx
                $working = $bytevalue & 0x7;
                $bytesleft = 3;
            }
        }
        return $result;
    }
    /** No bugs detected in iconv. */
    const ICONV_OK = 0;
    /** Iconv truncates output if converting from UTF-8 to another
     *  character set with //IGNORE, and a non-encodable character is found */
    const ICONV_TRUNCATES = 1;
    /** Iconv does not support //IGNORE, making it unusable for
     *  transcoding purposes */
    const ICONV_UNUSABLE = 2;
    /**
     * glibc iconv has a known bug where it doesn't handle the magic
     * //IGNORE stanza correctly.  In particular, rather than ignore
     * characters, it will return an EILSEQ after consuming some number
     * of characters, and expect you to restart iconv as if it were
     * an E2BIG.  Old versions of PHP did not respect the errno, and
     * returned the fragment, so as a result you would see iconv
     * mysteriously truncating output. We can work around this by
     * manually chopping our input into segments of about 8000
     * characters, as long as PHP ignores the error code.  If PHP starts
     * paying attention to the error code, iconv becomes unusable.
     *
     * @return int Error code indicating severity of bug.
     */
    public static function testIconvTruncateBug()
    {
        static $code = null;
        if ($code === null) {
            // better not use iconv, otherwise infinite loop!
            $r = self::unsafeIconv('utf-8', 'ascii//IGNORE', "α" . \str_repeat('a', 9000));
            if ($r === \false) {
                $code = self::ICONV_UNUSABLE;
            } elseif (($c = \strlen($r)) < 9000) {
                $code = self::ICONV_TRUNCATES;
            } elseif ($c > 9000) {
                \trigger_error('Your copy of iconv is extremely buggy. Please notify HTML Purifier maintainers: ' . 'include your iconv version as per phpversion()', \E_USER_ERROR);
            } else {
                $code = self::ICONV_OK;
            }
        }
        return $code;
    }
    /**
     * This expensive function tests whether or not a given character
     * encoding supports ASCII. 7/8-bit encodings like Shift_JIS will
     * fail this test, and require special processing. Variable width
     * encodings shouldn't ever fail.
     *
     * @param string $encoding Encoding name to test, as per iconv format
     * @param bool $bypass Whether or not to bypass the precompiled arrays.
     * @return Array of UTF-8 characters to their corresponding ASCII,
     *      which can be used to "undo" any overzealous iconv action.
     */
    public static function testEncodingSupportsASCII($encoding, $bypass = \false)
    {
        // All calls to iconv here are unsafe, proof by case analysis:
        // If ICONV_OK, no difference.
        // If ICONV_TRUNCATE, all calls involve one character inputs,
        // so bug is not triggered.
        // If ICONV_UNUSABLE, this call is irrelevant
        static $encodings = array();
        if (!$bypass) {
            if (isset($encodings[$encoding])) {
                return $encodings[$encoding];
            }
            $lenc = \strtolower($encoding);
            switch ($lenc) {
                case 'shift_jis':
                    return array("¥" => '\\', "‾" => '~');
                case 'johab':
                    return array("₩" => '\\');
            }
            if (\strpos($lenc, 'iso-8859-') === 0) {
                return array();
            }
        }
        $ret = array();
        if (self::unsafeIconv('UTF-8', $encoding, 'a') === \false) {
            return \false;
        }
        for ($i = 0x20; $i <= 0x7e; $i++) {
            // all printable ASCII chars
            $c = \chr($i);
            // UTF-8 char
            $r = self::unsafeIconv('UTF-8', "{$encoding}//IGNORE", $c);
            // initial conversion
            if ($r === '' || $r === $c && self::unsafeIconv($encoding, 'UTF-8//IGNORE', $r) !== $c) {
                // Reverse engineer: what's the UTF-8 equiv of this byte
                // sequence? This assumes that there's no variable width
                // encoding that doesn't support ASCII.
                $ret[self::unsafeIconv($encoding, 'UTF-8//IGNORE', $c)] = $c;
            }
        }
        $encodings[$encoding] = $ret;
        return $ret;
    }
}
// vim: et sw=4 sts=4
