Merge branch 'dev' of https://github.com/redmatrix/hubzilla into xdev_merge

1 files changed, 0 insertions, 611 deletions

diff --git a/library/HTMLPurifier/Encoder.php b/library/HTMLPurifier/Encoder.php
deleted file mode 100644
index fef9b5890..000000000
--- a/library/HTMLPurifier/Encoder.php
+++ /dev/null
@@ -1,611 +0,0 @@
-<?php
-
-/**
- * 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('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.
-     *
-     * @param string $str The string to clean
-     * @param bool $force_php
-     * @return string
-     *
-     * @note Just for reference, the non-SGML code points are 0 to 31 and
-     *       127 to 159, inclusive.  However, we allow code points 9, 10
-     *       and 13, which are the tab, line feed and carriage return
-     *       respectively. 128 and above the code points map to multibyte
-     *       UTF-8 representations.
-     *
-     * @note Fallback code adapted from utf8ToUnicode by Henri Sivonen and
-     *       hsivonen@iki.fi at <http://iki.fi/hsivonen/php-utf8/> under the
-     *       LGPL license.  Notes on what changed are inside, but in general,
-     *       the original code transformed UTF-8 text into an array of integer
-     *       Unicode codepoints. Understandably, transforming that back to
-     *       a string would be somewhat expensive, so the function was modded to
-     *       directly operate on the string.  However, this discourages code
-     *       reuse, and the logic enumerated here would be useful for any
-     *       function that needs to be able to understand UTF-8 characters.
-     *       As of right now, only smart lossless character encoding converters
-     *       would need that, and I'm probably not going to implement them.
-     *       Once again, PHP 6 should solve all our problems.
-     */
-    public static function cleanUTF8($str, $force_php = false)
-    {
-        // UTF-8 validity is checked since PHP 4.3.5
-        // This is an optimization: if the string is already valid UTF-8, no
-        // need to do PHP stuff. 99% of the time, this will be the case.
-        // The regexp matches the XML char production, as well as well as excluding
-        // non-SGML codepoints U+007F to U+009F
-        if (preg_match(
-            '/^[\x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]*$/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) // save \r\t\n
-                    ) {
-                        // 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 & 0x0F) << 12;
-                    $mState = 2;
-                    $mBytes = 3;
-                } elseif (0xF0 == (0xF8 & ($in))) {
-                    // First octet of 4 octet sequence
-                    $mUcs4 = ($in);
-                    $mUcs4 = ($mUcs4 & 0x07) << 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 & 0x03) << 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 & 0x0000003F) << $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 < 0x0080)) ||
-                            ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
-                            ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
-                            (4 < $mBytes) ||
-                            // From Unicode 3.2, surrogate characters = illegal
-                            (($mUcs4 & 0xFFFFF800) == 0xD800) ||
-                            // Codepoints outside the Unicode range are illegal
-                            ($mUcs4 > 0x10FFFF)
-                        ) {
-
-                        } elseif (0xFEFF != $mUcs4 && // omit BOM
-                            // check for valid Char unicode codepoints
-                            (
-                                0x9 == $mUcs4 ||
-                                0xA == $mUcs4 ||
-                                0xD == $mUcs4 ||
-                                (0x20 <= $mUcs4 && 0x7E >= $mUcs4) ||
-                                // 7F-9F is not strictly prohibited by XML,
-                                // but it is non-SGML, and thus we don't allow it
-                                (0xA0 <= $mUcs4 && 0xD7FF >= $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') {
-            $str = utf8_encode($str);
-            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') {
-            $str = utf8_decode($str);
-            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 & 0x0F;
-                $bytesleft = 2;
-            } else { //1111 0xxx
-                $working = $bytevalue & 0x07;
-                $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!
-            $r = self::unsafeIconv('utf-8', 'ascii//IGNORE', "\xCE\xB1" . str_repeat('a', 9000));
-            if ($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 ($lenc) {
-                case 'shift_jis':
-                    return array("\xC2\xA5" => '\\', "\xE2\x80\xBE" => '~');
-                case 'johab':
-                    return array("\xE2\x82\xA9" => '\\');
-            }
-            if (strpos($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 === '' ||
-                // This line is needed for iconv implementations that do not
-                // omit characters that do not exist in the target character set
-                ($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