Xlquiz 0.1.1 > Classes / Excel / Oleread.inc

<?php
define('NUM_BIG_BLOCK_DEPOT_BLOCKS_POS', 0x2c);
define('SMALL_BLOCK_DEPOT_BLOCK_POS', 0x3c);
define('ROOT_START_BLOCK_POS', 0x30);
define('BIG_BLOCK_SIZE', 0x200);
define('SMALL_BLOCK_SIZE', 0x40);
define('EXTENSION_BLOCK_POS', 0x44);
define('NUM_EXTENSION_BLOCK_POS', 0x48);
define('PROPERTY_STORAGE_BLOCK_SIZE', 0x80);
define('BIG_BLOCK_DEPOT_BLOCKS_POS', 0x4c);
define('SMALL_BLOCK_THRESHOLD', 0x1000);
// property storage offsets
define('SIZE_OF_NAME_POS', 0x40);
define('TYPE_POS', 0x42);
define('START_BLOCK_POS', 0x74);
define('SIZE_POS', 0x78);
define('IDENTIFIER_OLE', pack("CCCCCCCC", 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1));

//echo 'ROOT_START_BLOCK_POS = '.ROOT_START_BLOCK_POS."\n";

//echo bin2hex($data[ROOT_START_BLOCK_POS])."\n";
//echo "a=";
//echo $data[ROOT_START_BLOCK_POS];
//function log

function GetInt4d($data, $pos) {
        return ord($data[$pos]) | (ord($data[$pos+1]) << 8) | (ord($data[$pos+2]) << 16) | (ord($data[$pos+3]) << 24);
}


class OLERead {
    var $data = '';
   
   
    function OLERead(){
       
       
    }
   
    function read($sFileName){
       
     // check if file exist and is readable (Darko Miljanovic)
     if(!is_readable($sFileName)) {
      $this->error = 1;
      return false;
     }
     
     $this->data = @file_get_contents($sFileName);
     if (!$this->data) {
      $this->error = 1;
      return false;
    }
    //echo IDENTIFIER_OLE;
    //echo 'start';
    if (substr($this->data, 0, 8) != IDENTIFIER_OLE) {
      $this->error = 1;
      return false;
    }
        $this->numBigBlockDepotBlocks = GetInt4d($this->data, NUM_BIG_BLOCK_DEPOT_BLOCKS_POS);
        $this->sbdStartBlock = GetInt4d($this->data, SMALL_BLOCK_DEPOT_BLOCK_POS);
        $this->rootStartBlock = GetInt4d($this->data, ROOT_START_BLOCK_POS);
        $this->extensionBlock = GetInt4d($this->data, EXTENSION_BLOCK_POS);
        $this->numExtensionBlocks = GetInt4d($this->data, NUM_EXTENSION_BLOCK_POS);
       
 /*
        echo $this->numBigBlockDepotBlocks." ";
        echo $this->sbdStartBlock." ";
        echo $this->rootStartBlock." ";
        echo $this->extensionBlock." ";
        echo $this->numExtensionBlocks." ";
        */
        //echo "sbdStartBlock = $this->sbdStartBlock\n";
        $bigBlockDepotBlocks = array();
        $pos = BIG_BLOCK_DEPOT_BLOCKS_POS;
      // echo "pos = $pos";
 $bbdBlocks = $this->numBigBlockDepotBlocks;
       
            if ($this->numExtensionBlocks != 0) {
                $bbdBlocks = (BIG_BLOCK_SIZE - BIG_BLOCK_DEPOT_BLOCKS_POS)/4;
            }
       
        for ($i = 0; $i < $bbdBlocks; $i++) {
              $bigBlockDepotBlocks[$i] = GetInt4d($this->data, $pos);
              $pos += 4;
        }
       
       
        for ($j = 0; $j < $this->numExtensionBlocks; $j++) {
            $pos = ($this->extensionBlock + 1) * BIG_BLOCK_SIZE;
            $blocksToRead = min($this->numBigBlockDepotBlocks - $bbdBlocks, BIG_BLOCK_SIZE / 4 - 1);

            for ($i = $bbdBlocks; $i < $bbdBlocks + $blocksToRead; $i++) {
                $bigBlockDepotBlocks[$i] = GetInt4d($this->data, $pos);
                $pos += 4;
            } 

            $bbdBlocks += $blocksToRead;
            if ($bbdBlocks < $this->numBigBlockDepotBlocks) {
                $this->extensionBlock = GetInt4d($this->data, $pos);
            }
        }

      // var_dump($bigBlockDepotBlocks);
       
        // readBigBlockDepot
        $pos = 0;
        $index = 0;
        $this->bigBlockChain = array();
       
        for ($i = 0; $i < $this->numBigBlockDepotBlocks; $i++) {
            $pos = ($bigBlockDepotBlocks[$i] + 1) * BIG_BLOCK_SIZE;
            //echo "pos = $pos"; 
            for ($j = 0 ; $j < BIG_BLOCK_SIZE / 4; $j++) {
                $this->bigBlockChain[$index] = GetInt4d($this->data, $pos);
                $pos += 4 ;
                $index++;
            }
        }

 //var_dump($this->bigBlockChain);
        //echo '=====2';
        // readSmallBlockDepot();
        $pos = 0;
     $index = 0;
     $sbdBlock = $this->sbdStartBlock;
     $this->smallBlockChain = array();
 
     while ($sbdBlock != -2) {
 
       $pos = ($sbdBlock + 1) * BIG_BLOCK_SIZE;
 
       for ($j = 0; $j < BIG_BLOCK_SIZE / 4; $j++) {
         $this->smallBlockChain[$index] = GetInt4d($this->data, $pos);
         $pos += 4;
         $index++;
       }
 
       $sbdBlock = $this->bigBlockChain[$sbdBlock];
     }

       
        // readData(rootStartBlock)
        $block = $this->rootStartBlock;
        $pos = 0;
        $this->entry = $this->__readData($block);
       
        /*
        while ($block != -2)  {
            $pos = ($block + 1) * BIG_BLOCK_SIZE;
            $this->entry = $this->entry.substr($this->data, $pos, BIG_BLOCK_SIZE);
            $block = $this->bigBlockChain[$block];
        }
        */
        //echo '==='.$this->entry."===";
        $this->__readPropertySets();

    }
   
    function __readData($bl) {
        $block = $bl;
        $pos = 0;
        $data = '';
       
        while ($block != -2)  {
            $pos = ($block + 1) * BIG_BLOCK_SIZE;
            $data = $data.substr($this->data, $pos, BIG_BLOCK_SIZE);
            //echo "pos = $pos data=$data\n"; 
     $block = $this->bigBlockChain[$block];
        }
  return $data;
    }
       
    function __readPropertySets(){
        $offset = 0;
        //var_dump($this->entry);
        while ($offset < strlen($this->entry)) {
              $d = substr($this->entry, $offset, PROPERTY_STORAGE_BLOCK_SIZE);
           
              $nameSize = ord($d[SIZE_OF_NAME_POS]) | (ord($d[SIZE_OF_NAME_POS+1]) << 8);
             
              $type = ord($d[TYPE_POS]);
              //$maxBlock = strlen($d) / BIG_BLOCK_SIZE - 1;
       
              $startBlock = GetInt4d($d, START_BLOCK_POS);
              $size = GetInt4d($d, SIZE_POS);
       
            $name = '';
            for ($i = 0; $i < $nameSize ; $i++) {
              $name .= $d[$i];
            }
           
            $name = str_replace("\x00", "", $name);
           
            $this->props[] = array (
                'name' => $name,
                'type' => $type,
                'startBlock' => $startBlock,
                'size' => $size);

            if (($name == "Workbook") || ($name == "Book")) {
                $this->wrkbook = count($this->props) - 1;
            }

            if ($name == "Root Entry") {
                $this->rootentry = count($this->props) - 1;
            }
           
            //echo "name ==$name=\n";

           
            $offset += PROPERTY_STORAGE_BLOCK_SIZE;
        } 
       
    }
   
   
    function getWorkBook(){
     if ($this->props[$this->wrkbook]['size'] < SMALL_BLOCK_THRESHOLD){
//       getSmallBlockStream(PropertyStorage ps)

   $rootdata = $this->__readData($this->props[$this->rootentry]['startBlock']);
        
   $streamData = '';
         $block = $this->props[$this->wrkbook]['startBlock'];
         //$count = 0;
         $pos = 0;
      while ($block != -2) {
                 $pos = $block * SMALL_BLOCK_SIZE;
            $streamData .= substr($rootdata, $pos, SMALL_BLOCK_SIZE);

         $block = $this->smallBlockChain[$block];
      }
   
      return $streamData;
      

     }else{
     
         $numBlocks = $this->props[$this->wrkbook]['size'] / BIG_BLOCK_SIZE;
         if ($this->props[$this->wrkbook]['size'] % BIG_BLOCK_SIZE != 0) {
             $numBlocks++;
         }
        
         if ($numBlocks == 0) return '';
        
         //echo "numBlocks = $numBlocks\n";
     //byte[] streamData = new byte[numBlocks * BIG_BLOCK_SIZE];
         //print_r($this->wrkbook);
         $streamData = '';
         $block = $this->props[$this->wrkbook]['startBlock'];
         //$count = 0;
         $pos = 0;
         //echo "block = $block";
         while ($block != -2) {
           $pos = ($block + 1) * BIG_BLOCK_SIZE;
           $streamData .= substr($this->data, $pos, BIG_BLOCK_SIZE);
           $block = $this->bigBlockChain[$block];
         } 
         //echo 'stream'.$streamData;
         return $streamData;
     }
    }
   
}
?>