misc.php

<?php
	/**
	 * Converts a Windows-1252 encoded string to a UTF-8 encoded string
	 *
	 * @static
	 * @param string $string Windows-1252 encoded string
	 * @return string UTF-8 encoded string
	 */
	public static function windows_1252_to_utf8($string)
	{
		static $convert_table = array("\x80" => "\xE2\x82\xAC", "\x81" => "\xEF\xBF\xBD", "\x82" => "\xE2\x80\x9A", "\x83" => "\xC6\x92", "\x84" => "\xE2\x80\x9E", "\x85" => "\xE2\x80\xA6", "\x86" => "\xE2\x80\xA0", "\x87" => "\xE2\x80\xA1", "\x88" => "\xCB\x86", "\x89" => "\xE2\x80\xB0", "\x8A" => "\xC5\xA0", "\x8B" => "\xE2\x80\xB9", "\x8C" => "\xC5\x92", "\x8D" => "\xEF\xBF\xBD", "\x8E" => "\xC5\xBD", "\x8F" => "\xEF\xBF\xBD", "\x90" => "\xEF\xBF\xBD", "\x91" => "\xE2\x80\x98", "\x92" => "\xE2\x80\x99", "\x93" => "\xE2\x80\x9C", "\x94" => "\xE2\x80\x9D", "\x95" => "\xE2\x80\xA2", "\x96" => "\xE2\x80\x93", "\x97" => "\xE2\x80\x94", "\x98" => "\xCB\x9C", "\x99" => "\xE2\x84\xA2", "\x9A" => "\xC5\xA1", "\x9B" => "\xE2\x80\xBA", "\x9C" => "\xC5\x93", "\x9D" => "\xEF\xBF\xBD", "\x9E" => "\xC5\xBE", "\x9F" => "\xC5\xB8", "\xA0" => "\xC2\xA0", "\xA1" => "\xC2\xA1", "\xA2" => "\xC2\xA2", "\xA3" => "\xC2\xA3", "\xA4" => "\xC2\xA4", "\xA5" => "\xC2\xA5", "\xA6" => "\xC2\xA6", "\xA7" => "\xC2\xA7", "\xA8" => "\xC2\xA8", "\xA9" => "\xC2\xA9", "\xAA" => "\xC2\xAA", "\xAB" => "\xC2\xAB", "\xAC" => "\xC2\xAC", "\xAD" => "\xC2\xAD", "\xAE" => "\xC2\xAE", "\xAF" => "\xC2\xAF", "\xB0" => "\xC2\xB0", "\xB1" => "\xC2\xB1", "\xB2" => "\xC2\xB2", "\xB3" => "\xC2\xB3", "\xB4" => "\xC2\xB4", "\xB5" => "\xC2\xB5", "\xB6" => "\xC2\xB6", "\xB7" => "\xC2\xB7", "\xB8" => "\xC2\xB8", "\xB9" => "\xC2\xB9", "\xBA" => "\xC2\xBA", "\xBB" => "\xC2\xBB", "\xBC" => "\xC2\xBC", "\xBD" => "\xC2\xBD", "\xBE" => "\xC2\xBE", "\xBF" => "\xC2\xBF", "\xC0" => "\xC3\x80", "\xC1" => "\xC3\x81", "\xC2" => "\xC3\x82", "\xC3" => "\xC3\x83", "\xC4" => "\xC3\x84", "\xC5" => "\xC3\x85", "\xC6" => "\xC3\x86", "\xC7" => "\xC3\x87", "\xC8" => "\xC3\x88", "\xC9" => "\xC3\x89", "\xCA" => "\xC3\x8A", "\xCB" => "\xC3\x8B", "\xCC" => "\xC3\x8C", "\xCD" => "\xC3\x8D", "\xCE" => "\xC3\x8E", "\xCF" => "\xC3\x8F", "\xD0" => "\xC3\x90", "\xD1" => "\xC3\x91", "\xD2" => "\xC3\x92", "\xD3" => "\xC3\x93", "\xD4" => "\xC3\x94", "\xD5" => "\xC3\x95", "\xD6" => "\xC3\x96", "\xD7" => "\xC3\x97", "\xD8" => "\xC3\x98", "\xD9" => "\xC3\x99", "\xDA" => "\xC3\x9A", "\xDB" => "\xC3\x9B", "\xDC" => "\xC3\x9C", "\xDD" => "\xC3\x9D", "\xDE" => "\xC3\x9E", "\xDF" => "\xC3\x9F", "\xE0" => "\xC3\xA0", "\xE1" => "\xC3\xA1", "\xE2" => "\xC3\xA2", "\xE3" => "\xC3\xA3", "\xE4" => "\xC3\xA4", "\xE5" => "\xC3\xA5", "\xE6" => "\xC3\xA6", "\xE7" => "\xC3\xA7", "\xE8" => "\xC3\xA8", "\xE9" => "\xC3\xA9", "\xEA" => "\xC3\xAA", "\xEB" => "\xC3\xAB", "\xEC" => "\xC3\xAC", "\xED" => "\xC3\xAD", "\xEE" => "\xC3\xAE", "\xEF" => "\xC3\xAF", "\xF0" => "\xC3\xB0", "\xF1" => "\xC3\xB1", "\xF2" => "\xC3\xB2", "\xF3" => "\xC3\xB3", "\xF4" => "\xC3\xB4", "\xF5" => "\xC3\xB5", "\xF6" => "\xC3\xB6", "\xF7" => "\xC3\xB7", "\xF8" => "\xC3\xB8", "\xF9" => "\xC3\xB9", "\xFA" => "\xC3\xBA", "\xFB" => "\xC3\xBB", "\xFC" => "\xC3\xBC", "\xFD" => "\xC3\xBD", "\xFE" => "\xC3\xBE", "\xFF" => "\xC3\xBF");
		return strtr($string, $convert_table);
	}
	/**
	 * Change a string from one encoding to another
	 *
	 * @param string $data Raw data in $input encoding
	 * @param string $input Encoding of $data
	 * @param string $output Encoding you want
	 * @return string|boolean False if we can't convert it
	 */
	public static function change_encoding($data, $input, $output)
	{
		$input = SimplePie_Misc::encoding($input);
		$output = SimplePie_Misc::encoding($output);
		// We fail to fail on non US-ASCII bytes
		if ($input === 'US-ASCII')
		{
			static $non_ascii_octects = '';
			if (!$non_ascii_octects)
			{
				for ($i = 0x80; $i <= 0xFF; $i++)
				{
					$non_ascii_octects .= chr($i);
				}
			}
			$data = substr($data, 0, strcspn($data, $non_ascii_octects));
		}
		// This is first, as behaviour of this is completely predictable
		if ($input === 'windows-1252' && $output === 'UTF-8')
		{
			return SimplePie_Misc::windows_1252_to_utf8($data);
		}
		// This is second, as behaviour of this varies only with PHP version (the middle part of this expression checks the encoding is supported).
		elseif (function_exists('mb_convert_encoding') && ($return = SimplePie_Misc::change_encoding_mbstring($data, $input, $output)))
		{
			return $return;
 		}
		// This is third, as behaviour of this varies with OS userland and PHP version
		elseif (function_exists('iconv') && ($return = SimplePie_Misc::change_encoding_iconv($data, $input, $output)))
		{
			return $return;
		}
		// This is last, as behaviour of this varies with OS userland and PHP version
		elseif (class_exists('\UConverter') && ($return = SimplePie_Misc::change_encoding_uconverter($data, $input, $output)))
		{
			return $return;
		}
		// If we can't do anything, just fail
		return false;
	}
	protected static function change_encoding_mbstring($data, $input, $output)
	{
		if ($input === 'windows-949')
		{
			$input = 'EUC-KR';
		}
		if ($output === 'windows-949')
		{
			$output = 'EUC-KR';
		}
		if ($input === 'Windows-31J')
		{
			$input = 'SJIS';
		}
		if ($output === 'Windows-31J')
		{
			$output = 'SJIS';
		}
		// Check that the encoding is supported
		if (@mb_convert_encoding("\x80", 'UTF-16BE', $input) === "\x00\x80")
		{
			return false;
		}
		if (!in_array($input, mb_list_encodings()))
		{
			return false;
		}
		// Let's do some conversion
		if ($return = @mb_convert_encoding($data, $output, $input))
		{
			return $return;
		}
		return false;
	}
	protected static function change_encoding_iconv($data, $input, $output)
	{
		return @iconv($input, $output, $data);
	}
	/**
	 * @param string $data
	 * @param string $input
	 * @param string $output
	 * @return string|false
	 */
	protected static function change_encoding_uconverter($data, $input, $output)
	{
		return @\UConverter::transcode($data, $output, $input);
	}

	/**
	 * Converts a unicode codepoint to a UTF-8 character
	 *
	 * @static
	 * @param int $codepoint Unicode codepoint
	 * @return string UTF-8 character
	 */
	public static function codepoint_to_utf8($codepoint)
	{
		$codepoint = (int) $codepoint;
		if ($codepoint < 0)
		{
			return false;
		}
		else if ($codepoint <= 0x7f)
		{
			return chr($codepoint);
		}
		else if ($codepoint <= 0x7ff)
		{
			return chr(0xc0 | ($codepoint >> 6)) . chr(0x80 | ($codepoint & 0x3f));
		}
		else if ($codepoint <= 0xffff)
		{
			return chr(0xe0 | ($codepoint >> 12)) . chr(0x80 | (($codepoint >> 6) & 0x3f)) . chr(0x80 | ($codepoint & 0x3f));
		}
		else if ($codepoint <= 0x10ffff)
		{
			return chr(0xf0 | ($codepoint >> 18)) . chr(0x80 | (($codepoint >> 12) & 0x3f)) . chr(0x80 | (($codepoint >> 6) & 0x3f)) . chr(0x80 | ($codepoint & 0x3f));
		}
		// U+FFFD REPLACEMENT CHARACTER
		return "\xEF\xBF\xBD";
	}