phpclass:Bzip2

Bzip2.php

<?php 
/**
 * bzip2 class
 * @author Mark <zhaody901@126.com>
 */

class Bzip2
{
    const BZIP2_MODE_READ = 'r';
	const BZIP2_MODE_WRITE = 'w';

	/**
	 * 资源
	 * @var resource
	 */
	private $_rs;

	public function __construct($file, $mode)
	{
		if ($this->_moduleLoad()) {
			$this->_rs = bzopen($file, $mode);
		}
	}

	private function _moduleLoad()
	{
		if (!extension_loaded('bz2')) {
			return false;
		} else {
			return true;
		}
	}

	public function compress($source, $blocksize = 4, $workfactor = 0)
	{
		return bzcompress($source, $blocksize, $workfactor);
	}

	public function decompres($source, $small = 0)
	{
		return bzdecompress($source, $small);
	}

	public function close()
	{
		bzclose($this->_rs);
	}

	public function error()
	{
		return bzerror($this->_rs);
	}

	public function errno()
	{
		return bzerrno($this->_rs);
	}

	public function errstr()
	{
		return bzerrstr($this->_rs);
	}

	public function flush()
	{
		return bzflush($this->_rs);
	}

	public function read($length='1024')
	{
		return bzread($this->_rs, $length);
	}

	public function write($data, $length = 0)
	{
		if ($length) {
			return bzwrite($this->_rs, $data, $length);
		} else {
			return bzwrite($this->_rs, $data);
		}
	}
}
?>