zip.class.php

创建虚拟磁盘。用户可以创建磁盘

<?php 
##
#	Project: PHPDisk
#	This is NOT a freeware, use is subject to license terms.
#
#	Site: http://www.phpdisk.com
#
#	$Id: zip.class.php 212 2009-03-05 03:34:45Z along $
#
#	Copyright (C) 2008-2009 PHPDisk Team. All Rights Reserved.
#
##
class zip{
	
	var $_fp = null;
	var $_cdr = null;
	
	function zip(){
	  $this->_fp = false;
	  $this->_cdr = array();
	}
	
	function open($f){
		if (false === $this->_fp = @fopen($f, 'rb')){
			return false;
		}
	
	  	$this->_getCDR ();
		if (!((is_array($this->_cdr) AND count($this->_cdr)))){
			return false;
		}
	
		return true;
	}
	
	function getfile($name = ''){
		if($name == ''){
			list ($k, $v) = each($this->_cdr);
			if (is_array($v)){
				return $this->_getEntry($v['rel_offset']);
			}
		}else{
			$count = count($this->_cdr);
			for ($i = 0; $i < $count; ++$i){
				if ($this->_cdr[$i]['filename'] == $name){
					return $this->_getEntry ($this->_cdr[$i]['rel_offset']);
				}
			}
		}
	
		return false;
	}
	
	function getfilelist(){
		$count = count($this->_cdr);
		$files = array();
		for ($i = 0; $i < $count; ++$i){
		$files[] = $this->_cdr[$i]['filename'];
		}
	
		return $files;
	}
	
	function _getcdr(){
		fseek ($this->_fp, -22, SEEK_END);
		$stop_pos = ftell ($this->_fp);
		$d = fread($this->_fp, 22);
		if (strlen($d) != 22){
			return false;
		}
	
	  	$cdr = unpack('Ncdr_sig/nignore1/nignore2/nignore3/nignore4/Vcdr_size/Vdisk_num/ncomment_len', $d);
	  	if ($cdr['cdr_sig'] !== 1347093766){
			return false;
	  	}
	
	  	fseek($this->_fp, 0 - ($cdr['cdr_size'] + 22), SEEK_END);
	  	while(ftell($this->_fp) < $stop_pos){
			$data = fread($this->_fp, 46);
			if(strlen($data) != 46){
			  return false;
			}
	
			$fh = unpack('Vcfh_sig/vversion_made_by/vv_extract/ngen_flag/vcomppression_method/vmod_time/vmode_date/Ncrc32/Vcompressed_size/Vuncompressed_size/vfilename_len/nxtr_len/nfilecomment_len/ndisk_num_start/ninternal_attrib/Vext_attrib/Vrel_offset', $data);
			if (!((is_array($fh) AND !($fh['cfh_sig'] != 33639248)))){
				return false;
			}
	
			$fh['filename'] = ($fh['filename_len'] ? fread($this->_fp, $fh['filename_len']) : $fh['filename_len']);
			$fh['extra'] = ($fh['xtr_len'] ? fread($this->_fp, $fh['xtr_len']) : '');
			$fh['comments'] = ($fh['filecomment_len'] ? fread($this->_fp, $fh['filecomment_len']) : '');
			$this->_cdr[] = $fh;
		}
	
		return true;
	}
	
	function _getentry($lfh_offset){
	
	  	fseek($this->_fp, $lfh_offset, SEEK_SET);
	  	$lfh = unpack('Vheader_sig/Sversion_extract/Sgen_purpose/Scompression_method/Slast_mod_time/Slast_mod_date/Vcrc_32/Vcompressed_size/Vuncompressed_size/Sfile_name_length/Sextra_field_length', fread($this->_fp, 30));
	  	$lfh['name'] = ($lfh['file_name_length'] ? fread($this->_fp, $lfh['file_name_length']) : '');
	  	$lfh['extra_field'] = ($lfh['extra_field_length'] ? fread($this->_fp, $lfh['extra_field_length']) : '');
	  	if($lfh['compression_method'] == 8){
			$file_content = ($lfh['compressed_size'] ? @gzinflate(@fread($this->_fp, $lfh['compressed_size'])) : '');
	  	}else{
			if ($lfh['compression_method'] == 0){
				$file_content = ($lfh['compressed_size'] ? fread($this->_fp, $lfh['compressed_size']) : '');
			}else{
				return false;
			}
	  	}
	
	  	$ldd = ($lfh['gen_purpose'] & 8 ? unpack('Vcrc_32/Vcompressed_size/Vuncompressed_size', fread($this->_fp, 12)) : '');
	  	return array('name' => $lfh['name'], 'size' => $lfh['uncompressed_size'], 'content' => $file_content);
	}
	
	function close(){
		@fclose($this->_fp);
	}
}

if(!(function_exists ('gzinflate'))){
	exit ('ZIP cannot be used because the zlib library is not available.');
}

?>