1 files changed, 183 insertions, 0 deletions
diff --git a/vendor/masterminds/html5/src/HTML5/Parser/UTF8Utils.php b/vendor/masterminds/html5/src/HTML5/Parser/UTF8Utils.php
new file mode 100644
index 0000000..f6a70bf
--- /dev/null
+++ b/vendor/masterminds/html5/src/HTML5/Parser/UTF8Utils.php
@@ -0,0 +1,183 @@
+<?php
+
+namespace Masterminds\HTML5\Parser;
+
+/*
+Portions based on code from html5lib files with the following copyright:
+
+Copyright 2009 Geoffrey Sneddon <http://gsnedders.com/>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+    "Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+use Masterminds\HTML5\Exception;
+
+class UTF8Utils
+{
+    /**
+     * The Unicode replacement character.
+     */
+    const FFFD = "\xEF\xBF\xBD";
+
+    /**
+     * Count the number of characters in a string.
+     * UTF-8 aware. This will try (in order) iconv, MB, libxml, and finally a custom counter.
+     *
+     * @param string $string
+     *
+     * @return int
+     */
+    public static function countChars($string)
+    {
+        // Get the length for the string we need.
+        if (function_exists('mb_strlen')) {
+            return mb_strlen($string, 'utf-8');
+        }
+
+        if (function_exists('iconv_strlen')) {
+            return iconv_strlen($string, 'utf-8');
+        }
+
+        if (function_exists('utf8_decode')) {
+            // MPB: Will this work? Won't certain decodes lead to two chars
+            // extrapolated out of 2-byte chars?
+            return strlen(utf8_decode($string));
+        }
+
+        $count = count_chars($string);
+
+        // 0x80 = 0x7F - 0 + 1 (one added to get inclusive range)
+        // 0x33 = 0xF4 - 0x2C + 1 (one added to get inclusive range)
+        return array_sum(array_slice($count, 0, 0x80)) + array_sum(array_slice($count, 0xC2, 0x33));
+    }
+
+    /**
+     * Convert data from the given encoding to UTF-8.
+     *
+     * This has not yet been tested with charactersets other than UTF-8.
+     * It should work with ISO-8859-1/-13 and standard Latin Win charsets.
+     *
+     * @param string $data     The data to convert
+     * @param string $encoding A valid encoding. Examples: http://www.php.net/manual/en/mbstring.supported-encodings.php
+     *
+     * @return string
+     */
+    public static function convertToUTF8($data, $encoding = 'UTF-8')
+    {
+        /*
+         * From the HTML5 spec: Given an encoding, the bytes in the input stream must be converted
+         * to Unicode characters for the tokeniser, as described by the rules for that encoding,
+         * except that the leading U+FEFF BYTE ORDER MARK character, if any, must not be stripped
+         * by the encoding layer (it is stripped by the rule below). Bytes or sequences of bytes
+         * in the original byte stream that could not be converted to Unicode characters must be
+         * converted to U+FFFD REPLACEMENT CHARACTER code points.
+         */
+
+        // mb_convert_encoding is chosen over iconv because of a bug. The best
+        // details for the bug are on http://us1.php.net/manual/en/function.iconv.php#108643
+        // which contains links to the actual but reports as well as work around
+        // details.
+        if (function_exists('mb_convert_encoding')) {
+            // mb library has the following behaviors:
+            // - UTF-16 surrogates result in false.
+            // - Overlongs and outside Plane 16 result in empty strings.
+
+            // Before we run mb_convert_encoding we need to tell it what to do with
+            // characters it does not know. This could be different than the parent
+            // application executing this library so we store the value, change it
+            // to our needs, and then change it back when we are done. This feels
+            // a little excessive and it would be great if there was a better way.
+            $save = mb_substitute_character();
+            mb_substitute_character('none');
+            $data = mb_convert_encoding($data, 'UTF-8', $encoding);
+            mb_substitute_character($save);
+        }
+        // @todo Get iconv running in at least some environments if that is possible.
+        elseif (function_exists('iconv') && 'auto' !== $encoding) {
+            // fprintf(STDOUT, "iconv found\n");
+            // iconv has the following behaviors:
+            // - Overlong representations are ignored.
+            // - Beyond Plane 16 is replaced with a lower char.
+            // - Incomplete sequences generate a warning.
+            $data = @iconv($encoding, 'UTF-8//IGNORE', $data);
+        } else {
+            throw new Exception('Not implemented, please install mbstring or iconv');
+        }
+
+        /*
+         * One leading U+FEFF BYTE ORDER MARK character must be ignored if any are present.
+         */
+        if ("\xEF\xBB\xBF" === substr($data, 0, 3)) {
+            $data = substr($data, 3);
+        }
+
+        return $data;
+    }
+
+    /**
+     * Checks for Unicode code points that are not valid in a document.
+     *
+     * @param string $data A string to analyze
+     *
+     * @return array An array of (string) error messages produced by the scanning
+     */
+    public static function checkForIllegalCodepoints($data)
+    {
+        // Vestigal error handling.
+        $errors = array();
+
+        /*
+         * All U+0000 null characters in the input must be replaced by U+FFFD REPLACEMENT CHARACTERs.
+         * Any occurrences of such characters is a parse error.
+         */
+        for ($i = 0, $count = substr_count($data, "\0"); $i < $count; ++$i) {
+            $errors[] = 'null-character';
+        }
+
+        /*
+         * Any occurrences of any characters in the ranges U+0001 to U+0008, U+000B, U+000E to U+001F, U+007F
+         * to U+009F, U+D800 to U+DFFF , U+FDD0 to U+FDEF, and characters U+FFFE, U+FFFF, U+1FFFE, U+1FFFF,
+         * U+2FFFE, U+2FFFF, U+3FFFE, U+3FFFF, U+4FFFE, U+4FFFF, U+5FFFE, U+5FFFF, U+6FFFE, U+6FFFF, U+7FFFE,
+         * U+7FFFF, U+8FFFE, U+8FFFF, U+9FFFE, U+9FFFF, U+AFFFE, U+AFFFF, U+BFFFE, U+BFFFF, U+CFFFE, U+CFFFF,
+         * U+DFFFE, U+DFFFF, U+EFFFE, U+EFFFF, U+FFFFE, U+FFFFF, U+10FFFE, and U+10FFFF are parse errors.
+         * (These are all control characters or permanently undefined Unicode characters.)
+         */
+        // Check PCRE is loaded.
+        $count = preg_match_all(
+            '/(?:
+        [\x01-\x08\x0B\x0E-\x1F\x7F] # U+0001 to U+0008, U+000B,  U+000E to U+001F and U+007F
+      |
+        \xC2[\x80-\x9F] # U+0080 to U+009F
+      |
+        \xED(?:\xA0[\x80-\xFF]|[\xA1-\xBE][\x00-\xFF]|\xBF[\x00-\xBF]) # U+D800 to U+DFFFF
+      |
+        \xEF\xB7[\x90-\xAF] # U+FDD0 to U+FDEF
+      |
+        \xEF\xBF[\xBE\xBF] # U+FFFE and U+FFFF
+      |
+        [\xF0-\xF4][\x8F-\xBF]\xBF[\xBE\xBF] # U+nFFFE and U+nFFFF (1 <= n <= 10_{16})
+      )/x', $data, $matches);
+        for ($i = 0; $i < $count; ++$i) {
+            $errors[] = 'invalid-codepoint';
+        }
+
+        return $errors;
+    }
+}