_safe_unserialize()

Complexity

Conditions	40
Paths	392

Size

Total Lines	156
Code Lines	86

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
function _safe_unserialize($str)
{
	if(strlen($str) > MAX_SERIALIZED_INPUT_LENGTH)
	{
		throw new \Exception('safe_unserialize: input exceeds ' . MAX_SERIALIZED_INPUT_LENGTH);
	}

	if(empty($str) || !is_string($str))
	{
		return false;
	}

	$stack = array();
	$expected = array();
	$state = 0;

	while($state != 1)
	{
		$type = isset($str[0]) ? $str[0] : '';

		if($type == '}')
		{
			$str = substr($str, 1);
		}
		else if($type == 'N' && $str[1] == ';')
		{
			$value = null;
			$str = substr($str, 2);
		}
		else if($type == 'b' && preg_match('/^b:([01]);/', $str, $matches))
		{
			$value = $matches[1] == '1' ? true : false;
			$str = substr($str, 4);
		}
		else if($type == 'i' && preg_match('/^i:(-?[0-9]+);(.*)/s', $str, $matches))
		{
			$value = (int)$matches[1];
			$str = $matches[2];
		}
		else if($type == 'd' && preg_match('/^d:(-?[0-9]+\.?[0-9]*(E[+-][0-9]+)?);(.*)/s', $str, $matches))
		{
			$value = (float)$matches[1];
			$str = $matches[3];
		}
		else if($type == 's' && preg_match('/^s:([0-9]+):"(.*)/s', $str, $matches) && substr($matches[2], (int)$matches[1], 2) == '";')
		{
			$value = substr($matches[2], 0, (int)$matches[1]);
			$str = substr($matches[2], (int)$matches[1] + 2);
		}
		else if($type == 'a' && preg_match('/^a:([0-9]+):{(.*)/s', $str, $matches) && $matches[1] < MAX_SERIALIZED_ARRAY_LENGTH)
		{
			$expectedLength = (int)$matches[1];
			$str = $matches[2];
		}
		else if($type == 'O')
		{
			throw new \Exception('safe_unserialize: objects not supported');
		}
		else
		{
			throw new \Exception('safe_unserialize: unknown/malformed type: '.$type);
		}

		switch($state)
		{
			case 3: // in array, expecting value or another array
				if($type == 'a')
				{
					if(count($stack) >= MAX_SERIALIZED_ARRAY_DEPTH)
					{
						throw new \Exception('safe_unserialize: array nesting exceeds ' . MAX_SERIALIZED_ARRAY_DEPTH);
					}

					$stack[] = &$list;

The variable $list does not seem to be defined for all execution paths leading up to this point.

					$list[$key] = array();

The variable $key does not seem to be defined for all execution paths leading up to this point.

					$list = &$list[$key];
					$expected[] = $expectedLength;

The variable $expectedLength does not seem to be defined for all execution paths leading up to this point.

					$state = 2;
					break;
				}
				if($type != '}')
				{
					$list[$key] = $value;

The variable $value does not seem to be defined for all execution paths leading up to this point.

					$state = 2;
					break;
				}

				throw new \Exception('safe_unserialize: missing array value');

			case 2: // in array, expecting end of array or a key
				if($type == '}')
				{
					if(count($list) < end($expected))
					{
						throw new \Exception('safe_unserialize: array size less than expected ' . $expected[0]);
					}

					unset($list);
					$list = &$stack[count($stack)-1];
					array_pop($stack);

					// go to terminal state if we're at the end of the root array
					array_pop($expected);
					if(count($expected) == 0) {
						$state = 1;
					}
					break;
				}
				if($type == 'i' || $type == 's')
				{
					if(count($list) >= MAX_SERIALIZED_ARRAY_LENGTH)
					{
						throw new \Exception('safe_unserialize: array size exceeds ' . MAX_SERIALIZED_ARRAY_LENGTH);
					}
					if(count($list) >= end($expected))
					{
						throw new \Exception('safe_unserialize: array size exceeds expected length');
					}

					$key = $value;
					$state = 3;
					break;
				}

				throw new \Exception('safe_unserialize: illegal array index type');

			case 0: // expecting array or value
				if($type == 'a')
				{
					if(count($stack) >= MAX_SERIALIZED_ARRAY_DEPTH)
					{
						throw new \Exception('safe_unserialize: array nesting exceeds ' . MAX_SERIALIZED_ARRAY_DEPTH);
					}

					$data = array();
					$list = &$data;
					$expected[] = $expectedLength;
					$state = 2;
					break;
				}
				if($type != '}')
				{
					$data = $value;
					$state = 1;
					break;
				}

				throw new \Exception('safe_unserialize: not in array');
		}
	}

	if(!empty($str))
	{
		throw new \Exception('safe_unserialize: trailing data in input');
	}
	return $data;

The variable $data does not seem to be defined for all execution paths leading up to this point.

}
?>

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