<?php
   function _readPpsWks($blockId)
    {
        $fh = $this->getStream($blockId);
        for ($pos = 0; ; $pos += 128) {
            fseek($fh, $pos, SEEK_SET);
            $nameUtf16 = fread($fh, 64);
            $nameLength = $this->_readInt2($fh);
            $nameUtf16 = substr($nameUtf16, 0, $nameLength - 2);
            // Simple conversion from UTF-16LE to ISO-8859-1
            $name = str_replace("\x00", "", $nameUtf16);
            $type = $this->_readInt1($fh);
            switch ($type) {
            case OLE_PPS_TYPE_ROOT:
                $pps = new OLE_PPS_Root(null, null, array());
                $this->root = $pps;
                break;
            case OLE_PPS_TYPE_DIR:
                $pps = new OLE_PPS(null, null, null, null, null,
                                   null, null, null, null, array());
                break;
            case OLE_PPS_TYPE_FILE:
                $pps = new OLE_PPS_File($name);
                break;
            default:
                continue; //////////////////////////// o erro indica nessa linha
            }
            fseek($fh, 1, SEEK_CUR);
            $pps->Type    = $type;
            $pps->Name    = $name;
            $pps->PrevPps = $this->_readInt4($fh);
            $pps->NextPps = $this->_readInt4($fh);
            $pps->DirPps  = $this->_readInt4($fh);
            fseek($fh, 20, SEEK_CUR);
            $pps->Time1st = OLE::OLE2LocalDate(fread($fh, 8));
            $pps->Time2nd = OLE::OLE2LocalDate(fread($fh, 8));
            $pps->_StartBlock = $this->_readInt4($fh);
            $pps->Size = $this->_readInt4($fh);
            $pps->No = count($this->_list);
            $this->_list[] = $pps;
            // check if the PPS tree (starting from root) is complete
            if (isset($this->root) &&
                $this->_ppsTreeComplete($this->root->No)) {
                break;
            }
        }
        fclose($fh);
        // Initialize $pps->children on directories
        foreach ($this->_list as $pps) {
            if ($pps->Type == OLE_PPS_TYPE_DIR || $pps->Type == OLE_PPS_TYPE_ROOT) {
                $nos = array($pps->DirPps);
                $pps->children = array();
                while ($nos) {
                    $no = array_pop($nos);
                    if ($no != -1) {
                        $childPps = $this->_list[$no];
                        $nos[] = $childPps->PrevPps;
                        $nos[] = $childPps->NextPps;
                        $pps->children[] = $childPps;
                    }
                }
            }
        }
        return true;
    }
?>