public function getPreviousLine(){
		if(count($this->content) === 0 || $this->readPointer < 1){
			
			do {
				$buff = $this->readChunk();
				
				if($buff !== FALSE){
					$eolPos = strpos($buff, "\n");
				}else{
					// Empty buffer, no more to read.
					if(strlen($this->remainder) > 0){
						$buff = $this->remainder;
						$this->remainder = '';
						// Exit from while-loop
						break;
					}else{
						// Remainder also empty.
						return FALSE;
					}
				}
				
				if($eolPos === FALSE){
					// No eol found. Make buffer head of remainder and empty buffer.
					$this->remainder = $buff . $this->remainder;
					$buff = '';
				}elseif($eolPos !== 0){
					// eol found.
					$buff .= $this->remainder;
					$this->remainder = substr($buff, 0, $eolPos);
					$buff = substr($buff, $eolPos+1);
				}elseif($eolPos === 0){
					$buff .= $this->remainder;
					$buff = substr($buff, 1);
					$this->remainder = '';
				}
				
			}while(($buff !== FALSE) && ($eolPos === FALSE));
			
			$this->content = explode("\n", $buff);
			$this->readPointer = count($this->content);
		}
		
		if(count($this->content) > 0){
			return $this->content[--$this->readPointer];
		}else{
			return FALSE;
		}
	}