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<?php |
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function sanitize_filename($input) |
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{ |
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$input = sanitize_slashes($input); |
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$output = ''; |
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while ($input !== '') { |
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if ( |
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($prefix = substr($input, 0, 3)) == '../' || |
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($prefix = substr($input, 0, 2)) == './' |
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) { |
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$input = substr($input, strlen($prefix)); |
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} else if ( |
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($prefix = substr($input, 0, 3)) == '/./' || |
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($prefix = $input) == '/.' |
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) { |
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$input = '/' . substr($input, strlen($prefix)); |
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} else |
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if ( |
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($prefix = substr($input, 0, 4)) == '/../' || |
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($prefix = $input) == '/..' |
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) { |
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$input = '/' . substr($input, strlen($prefix)); |
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$output = substr($output, 0, strrpos($output, '/')); |
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} else if ($input == '.' || $input == '..') { |
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$input = ''; |
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} else { |
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$pos = strpos($input, '/'); |
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if ($pos === 0) $pos = strpos($input, '/', $pos+1); |
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if ($pos === false) $pos = strlen($input); |
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$output .= substr($input, 0, $pos); |
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$input = (string) substr($input, $pos); |
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} |
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} |
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return $output; |
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} |
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function sanitize_slashes($filename) |
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{ |
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return str_replace('\\', '/', $filename); |
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} |
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LFFATE /
ccg
