PclZip::privReadCentralFileHeader

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Syntax Syntax

PclZip::privReadCentralFileHeader( $p_header )

Source Source

File: wp-admin/includes/class-pclzip.php

  function privReadCentralFileHeader(&$p_header)
  {
    $v_result=1;

    // ----- Read the 4 bytes signature
    $v_binary_data = @fread($this->zip_fd, 4);
    $v_data = unpack('Vid', $v_binary_data);

    // ----- Check signature
    if ($v_data['id'] != 0x02014b50)
    {

      // ----- Error log
      PclZip::privErrorLog(PCLZIP_ERR_BAD_FORMAT, 'Invalid archive structure');

      // ----- Return
      return PclZip::errorCode();
    }

    // ----- Read the first 42 bytes of the header
    $v_binary_data = fread($this->zip_fd, 42);

    // ----- Look for invalid block size
    if (strlen($v_binary_data) != 42)
    {
      $p_header['filename'] = "";
      $p_header['status'] = "invalid_header";

      // ----- Error log
      PclZip::privErrorLog(PCLZIP_ERR_BAD_FORMAT, "Invalid block size : ".strlen($v_binary_data));

      // ----- Return
      return PclZip::errorCode();
    }

    // ----- Extract the values
    $p_header = unpack('vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $v_binary_data);

    // ----- Get filename
    if ($p_header['filename_len'] != 0)
      $p_header['filename'] = fread($this->zip_fd, $p_header['filename_len']);
    else
      $p_header['filename'] = '';

    // ----- Get extra
    if ($p_header['extra_len'] != 0)
      $p_header['extra'] = fread($this->zip_fd, $p_header['extra_len']);
    else
      $p_header['extra'] = '';

    // ----- Get comment
    if ($p_header['comment_len'] != 0)
      $p_header['comment'] = fread($this->zip_fd, $p_header['comment_len']);
    else
      $p_header['comment'] = '';

    // ----- Extract properties

    // ----- Recuperate date in UNIX format
    //if ($p_header['mdate'] && $p_header['mtime'])
    // TBC : bug : this was ignoring time with 0/0/0
    if (1)
    {
      // ----- Extract time
      $v_hour = ($p_header['mtime'] & 0xF800) >> 11;
      $v_minute = ($p_header['mtime'] & 0x07E0) >> 5;
      $v_seconde = ($p_header['mtime'] & 0x001F)*2;

      // ----- Extract date
      $v_year = (($p_header['mdate'] & 0xFE00) >> 9) + 1980;
      $v_month = ($p_header['mdate'] & 0x01E0) >> 5;
      $v_day = $p_header['mdate'] & 0x001F;

      // ----- Get UNIX date format
      $p_header['mtime'] = @mktime($v_hour, $v_minute, $v_seconde, $v_month, $v_day, $v_year);

    }
    else
    {
      $p_header['mtime'] = time();
    }

    // ----- Set the stored filename
    $p_header['stored_filename'] = $p_header['filename'];

    // ----- Set default status to ok
    $p_header['status'] = 'ok';

    // ----- Look if it is a directory
    if (substr($p_header['filename'], -1) == '/') {
      //$p_header['external'] = 0x41FF0010;
      $p_header['external'] = 0x00000010;
    }


    // ----- Return
    return $v_result;
  }

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