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Создаём zip в PHP на лету

Апрель 17, 2007 at 19:35 · Размещено в Новости, Программирование, PHP
Code (php)
 
<?php
/*
 
Zip file creation class
makes zip files on the fly…
 
use the functions add_dir() and add_file() to build the zip file;
see example code below
 
by Eric Mueller
http://www.themepark.com
 
v1.1 9-20-01
  - added comments to example
 
v1.0 2-5-01
 
initial version with:
  - class appearance
  - add_file() and file() methods
  - gzcompress() output hacking
by Denis O.Philippov, webmaster@atlant.ru, http://www.atlant.ru
 
*/
 
// official ZIP file format: http://www. // pkware.com/appnote.txt
 
class zipfile  
{  
 
    var $datasec = array(); // array to store compressed data
    var $ctrl_dir = array(); // central directory   
    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
    var $old_offset = 0;
 
    function add_dir($name)   
 
    // adds "directory" to archive - do this before putting any files in directory!
    // $name - name of directory… like this: "path/"
    // …then you can add files using add_file with names like "path/file.txt"
    {  
        $name = str_replace("\\", "/", $name);  
 
        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x0a\x00";    // ver needed to extract
        $fr .= "\x00\x00";    // gen purpose bit flag
        $fr .= "\x00\x00";    // compression method
        $fr .= "\x00\x00\x00\x00"; // last mod time and date
 
        $fr .= pack("V",0); // crc32
        $fr .= pack("V",0); //compressed filesize
        $fr .= pack("V",0); //uncompressed filesize
        $fr .= pack("v", strlen($name) ); //length of pathname
        $fr .= pack("v", 0 ); //extra field length
        $fr .= $name;  
        // end of "local file header" segment
 
        // no "file data" segment for path
 
        // "data descriptor" segment (optional but necessary if archive is not served as file)
        $fr .= pack("V",$crc); //crc32
        $fr .= pack("V",$c_len); //compressed filesize
        $fr .= pack("V",$unc_len); //uncompressed filesize
 
        // add this entry to array
        $this -> datasec[] = $fr;
 
        $new_offset = strlen(implode("", $this->datasec));
 
        // ext. file attributes mirrors MS-DOS directory attr byte, detailed
        // at http://support.microsoft.com/support/kb/articles/Q125/0/19.asp
 
        // now add to central record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .="\x00\x00";    // version made by
        $cdrec .="\x0a\x00";    // version needed to extract
        $cdrec .="\x00\x00";    // gen purpose bit flag
        $cdrec .="\x00\x00";    // compression method
        $cdrec .="\x00\x00\x00\x00"; // last mod time & date
        $cdrec .= pack("V",0); // crc32
        $cdrec .= pack("V",0); //compressed filesize
        $cdrec .= pack("V",0); //uncompressed filesize
        $cdrec .= pack("v", strlen($name) ); //length of filename
        $cdrec .= pack("v", 0 ); //extra field length   
        $cdrec .= pack("v", 0 ); //file comment length
        $cdrec .= pack("v", 0 ); //disk number start
        $cdrec .= pack("v", 0 ); //internal file attributes
        $ext = "\x00\x00\x10\x00";
        $ext = "\xff\xff\xff\xff";  
        $cdrec .= pack("V", 16 ); //external file attributes  - ‘directory’ bit set
 
        $cdrec .= pack("V", $this -> old_offset ); //relative offset of local header
        $this -> old_offset = $new_offset;
 
        $cdrec .= $name;  
        // optional extra field, file comment goes here
        // save to array
        $this -> ctrl_dir[] = $cdrec;  
 
         
    }
 
 
    function add_file($data, $name)   
 
    // adds "file" to archive   
    // $data - file contents
    // $name - name of file in archive. Add path if your want
 
    {  
        $name = str_replace("\\", "/", $name);  
        //$name = str_replace("\\", "\\\\", $name);
 
        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00";    // ver needed to extract
        $fr .= "\x00\x00";    // gen purpose bit flag
        $fr .= "\x08\x00";    // compression method
        $fr .= "\x00\x00\x00\x00"; // last mod time and date
 
        $unc_len = strlen($data);  
        $crc = crc32($data);  
        $zdata = gzcompress($data);  
        $zdata = substr( substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $c_len = strlen($zdata);  
        $fr .= pack("V",$crc); // crc32
        $fr .= pack("V",$c_len); //compressed filesize
        $fr .= pack("V",$unc_len); //uncompressed filesize
        $fr .= pack("v", strlen($name) ); //length of filename
        $fr .= pack("v", 0 ); //extra field length
        $fr .= $name;  
        // end of "local file header" segment
         
        // "file data" segment
        $fr .= $zdata;  
 
        // "data descriptor" segment (optional but necessary if archive is not served as file)
        $fr .= pack("V",$crc); //crc32
        $fr .= pack("V",$c_len); //compressed filesize
        $fr .= pack("V",$unc_len); //uncompressed filesize
 
        // add this entry to array
        $this -> datasec[] = $fr;
 
        $new_offset = strlen(implode("", $this->datasec));
 
        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .="\x00\x00";    // version made by
        $cdrec .="\x14\x00";    // version needed to extract
        $cdrec .="\x00\x00";    // gen purpose bit flag
        $cdrec .="\x08\x00";    // compression method
        $cdrec .="\x00\x00\x00\x00"; // last mod time & date
        $cdrec .= pack("V",$crc); // crc32
        $cdrec .= pack("V",$c_len); //compressed filesize
        $cdrec .= pack("V",$unc_len); //uncompressed filesize
        $cdrec .= pack("v", strlen($name) ); //length of filename
        $cdrec .= pack("v", 0 ); //extra field length   
        $cdrec .= pack("v", 0 ); //file comment length
        $cdrec .= pack("v", 0 ); //disk number start
        $cdrec .= pack("v", 0 ); //internal file attributes
        $cdrec .= pack("V", 32 ); //external file attributes - ‘archive’ bit set
 
        $cdrec .= pack("V", $this -> old_offset ); //relative offset of local header
//      &n // bsp; echo "old offset is ".$this->old_offset.", new offset is $new_offset
";
        $this -> old_offset = $new_offset;
 
        $cdrec .= $name;  
        // optional extra field, file comment goes here
        // save to central directory
        $this -> ctrl_dir[] = $cdrec;  
    }
 
    function file() { // dump out file   
        $data = implode("", $this -> datasec);  
        $ctrldir = implode("", $this -> ctrl_dir);  
 
        return   
            $data.  
            $ctrldir.  
            $this -> eof_ctrl_dir.  
            pack("v", sizeof($this -> ctrl_dir)).     // total # of entries "on this disk"
            pack("v", sizeof($this -> ctrl_dir)).     // total # of entries overall
            pack("V", strlen($ctrldir)).             // size of central dir
            pack("V", strlen($data)).                 // offset to start of central dir
            "\x00\x00";                             // .zip file comment length
    }
}  
 
?> 
 
Example Usage of the Class
 
<?php
 
$zipfile = new zipfile();  
 
// add the subdirectory … important!
$zipfile -> add_dir("dir/");
 
// add the binary data stored in the string ‘filedata’
$filedata = "(read your file into $filedata)";  
$zipfile -> add_file($filedata, "dir/file.txt");  
 
// the next three lines force an immediate download of the zip file:
header("Content-type: application/octet-stream");  
header("Content-disposition: attachment; filename=test.zip");  
echo $zipfile -> file();  
 
 
// OR instead of doing that, you can write out the file to the loca disk like this:
$filename = "output.zip";
$fd = fopen ($filename, "wb");
$out = fwrite ($fd, $zipfile -> file());
fclose ($fd);
 
// then offer it to the user to download:
<a href="output.zip">Click here to download the new zip file.</a>
?>
 
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Создаём zip в PHP на лету

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