<?php
/**
 * UTF8::ord
 *
 * @package    Kohana
 * @author     Kohana Team
 * @copyright  (c) Kohana Team
 * @copyright  (c) 2005 Harry Fuecks
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 */
function _ord($chr)
{
	$ord0 = ord($chr);

	if ($ord0 >= 0 AND $ord0 <= 127)
		return $ord0;

	if ( ! isset($chr[1]))
	{
		throw new UTF8_Exception('Short sequence - at least 2 bytes expected, only 1 seen');
	}

	$ord1 = ord($chr[1]);

	if ($ord0 >= 192 AND $ord0 <= 223)
		return ($ord0 - 192) * 64 + ($ord1 - 128);

	if ( ! isset($chr[2]))
	{
		throw new UTF8_Exception('Short sequence - at least 3 bytes expected, only 2 seen');
	}

	$ord2 = ord($chr[2]);

	if ($ord0 >= 224 AND $ord0 <= 239)
		return ($ord0 - 224) * 4096 + ($ord1 - 128) * 64 + ($ord2 - 128);

	if ( ! isset($chr[3]))
	{
		throw new UTF8_Exception('Short sequence - at least 4 bytes expected, only 3 seen');
	}

	$ord3 = ord($chr[3]);

	if ($ord0 >= 240 AND $ord0 <= 247)
		return ($ord0 - 240) * 262144 + ($ord1 - 128) * 4096 + ($ord2-128) * 64 + ($ord3 - 128);

	if ( ! isset($chr[4]))
	{
		throw new UTF8_Exception('Short sequence - at least 5 bytes expected, only 4 seen');
	}

	$ord4 = ord($chr[4]);

	if ($ord0 >= 248 AND $ord0 <= 251)
		return ($ord0 - 248) * 16777216 + ($ord1-128) * 262144 + ($ord2 - 128) * 4096 + ($ord3 - 128) * 64 + ($ord4 - 128);

	if ( ! isset($chr[5]))
	{
		throw new UTF8_Exception('Short sequence - at least 6 bytes expected, only 5 seen');
	}

	if ($ord0 >= 252 AND $ord0 <= 253)
		return ($ord0 - 252) * 1073741824 + ($ord1 - 128) * 16777216 + ($ord2 - 128) * 262144 + ($ord3 - 128) * 4096 + ($ord4 - 128) * 64 + (ord($chr[5]) - 128);

	if ($ord0 >= 254 AND $ord0 <= 255)
	{
		throw new UTF8_Exception("Invalid UTF-8 with surrogate ordinal ':ordinal'", [
			':ordinal' => $ord0,
		]);
	}
}
