function _storeSharedStringsTable()
    {
        $record  = 0x00fc;  // Record identifier
        $length  = 0x0008;  // Number of bytes to follow
        $total   = 0x0000;

        // Iterate through the strings to calculate the CONTINUE block sizes
        $continue_limit = 8208;
        $block_length   = 0;
        $written        = 0;
        $continue       = 0;

        // sizes are upside down
        $tmp_block_sizes = $this->_block_sizes;
        // $tmp_block_sizes = array_reverse($this->_block_sizes);

        // The SST record is required even if it contains no strings. Thus we will
        // always have a length
        //
        if (!empty($tmp_block_sizes)) {
            $length = 8 + array_shift($tmp_block_sizes);
        }
        else {
            // No strings
            $length = 8;
        }



        // Write the SST block header information
        $header      = pack("vv", $record, $length);
        $data        = pack("VV", $this->_str_total, $this->_str_unique);
        $this->_append($header . $data);




        /* TODO: not good for performance */
        foreach (array_keys($this->_str_table) as $string) {

            $string_length = strlen($string);
            $headerinfo    = unpack("vlength/Cencoding", $string);
            $encoding      = $headerinfo["encoding"];
            $split_string  = 0;

            // Block length is the total length of the strings that will be
            // written out in a single SST or CONTINUE block.
            //
            $block_length += $string_length;


            // We can write the string if it doesn't cross a CONTINUE boundary
            if ($block_length < $continue_limit) {
                $this->_append($string);
                $written += $string_length;
                continue;
            }

            // Deal with the cases where the next string to be written will exceed
            // the CONTINUE boundary. If the string is very long it may need to be
            // written in more than one CONTINUE record.
            //
            while ($block_length >= $continue_limit) {

                // We need to avoid the case where a string is continued in the first
                // n bytes that contain the string header information.
                //
                $header_length   = 3; // Min string + header size -1
                $space_remaining = $continue_limit - $written - $continue;


                // Unicode data should only be split on char (2 byte) boundaries.
                // Therefore, in some cases we need to reduce the amount of available
                // space by 1 byte to ensure the correct alignment.
                $align = 0;

                // Only applies to Unicode strings
                if ($encoding == 1) {
                    // Min string + header size -1
                    $header_length = 4;

                    if ($space_remaining > $header_length) {
                        // String contains 3 byte header => split on odd boundary
                        if (!$split_string && $space_remaining % 2 != 1) {
                            $space_remaining--;
                            $align = 1;
                        }
                        // Split section without header => split on even boundary
                        else if ($split_string && $space_remaining % 2 == 1) {
                            $space_remaining--;
                            $align = 1;
                        }

                        $split_string = 1;
                    }
                }


                if ($space_remaining > $header_length) {
                    // Write as much as possible of the string in the current block
                    $tmp = substr($string, 0, $space_remaining);
                    $this->_append($tmp);

                    // The remainder will be written in the next block(s)
                    $string = substr($string, $space_remaining);

                    // Reduce the current block length by the amount written
                    $block_length -= $continue_limit - $continue - $align;

                    // If the current string was split then the next CONTINUE block
                    // should have the string continue flag (grbit) set unless the
                    // split string fits exactly into the remaining space.
                    //
                    if ($block_length > 0) {
                        $continue = 1;
                    } else {
                        $continue = 0;
                    }
                } else {
                    // Not enough space to start the string in the current block
                    $block_length -= $continue_limit - $space_remaining - $continue;
                    $continue = 0;
                }

                // Write the CONTINUE block header
                if (!empty($this->_block_sizes)) {
                    $record  = 0x003C;
                    $length  = array_shift($tmp_block_sizes);

                    $header  = pack('vv', $record, $length);
                    if ($continue) {
                        $header .= pack('C', $encoding);
                    }
                    $this->_append($header);
                }

                // If the string (or substr) is small enough we can write it in the
                // new CONTINUE block. Else, go through the loop again to write it in
                // one or more CONTINUE blocks
                //
                if ($block_length < $continue_limit) {
                    $this->_append($string);
                    $written = $block_length;
                } else {
                    $written = 0;
                }
            }
        }
    }