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FILE MANIPULATION CODE

ZIP File Maker
By: Codewalkers
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    2002-01-18

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    Code class to create "zip" files on the fly.

    By : pnoeric

    <?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", $this -> old_offset ); //relative offset of local header
    // echo "old offset is ".$this->old_offset.", new offset is $new_offset<br>";
    $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 */

    <?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>

    ?>
    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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