<?php
/* $Id$ */
namespace Mammut\IO;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

/**
 * Memory buffer io class.
 * This implementation uses a internal ram buffer for io.
 *
 * @since 1.0.0.0
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\IO
 */
class Buffer extends \Mammut\StdObject implements iInput, iOutput {
	const _VERSION_ = '0.5.0.1';
	private $pos = 0;
	private $buffer = null;

	public function __construct($buffer = null) {
		if (!is_null($buffer))
			$this->setBuffer($buffer);
	}

	/**
	 * Put data into the buffer
	 * @param mixed $data
	 */
	public function setBuffer($data) {
		$this->buffer = $data;
	}

	public function getBuffer() {
		return $this->buffer;
	}

	public function getIOTypes() {
		return array(iIO::INPUT,iIO::OUTPUT);
	}

	public function isSeekSupported() {
		return true;
	}

	public function create() {
		if(!is_null($this->buffer))
			throw new \BadMethodCallException('already open');
		$this->buffer = '';
		$this->pos = 0;
	}

	public function open() {
		if(!is_null($this->buffer))
			throw new \BadMethodCallException('already open');
		$this->buffer = '';
		$this->pos = 0;
	}

	public function isOpen() {
		return !is_null($this->buffer);
	}

	public function seek($pos) {
		if(is_null($this->buffer))
			throw new \BadMethodCallException('already open');
		if($pos < 0 || $pos >= strlen($this->buffer))
			throw new \OutOfBoundsException();
		$this->pos = $pos;
	}

	public function getSize() {
		return strlen($this->buffer);
	}

	public function read($chunksize = 1024) {
		if(is_null($this->buffer))
			throw new \BadMethodCallException('not open');
		$result = substr($this->buffer, $this->pos, $chunksize);
		$this->pos += strlen($result);
		return $result;
	}

	public function write($data) {
		if(is_null($this->buffer))
			throw new \BadMethodCallException('not open');
		$this->buffer .= $data;
	}

	public function isEOF() {
		if(is_null($this->buffer))
			throw new \BadMethodCallException('not open');
		return strlen($this->buffer) - 1 <= $this->pos;
	}

	public function close() {
		$this->pos = 0;
		$this->buffer = NULL;
	}
}