Bug 156166 Error occour when previewing attached report in web viewer.
Decription:Error occour when previewing attached report in web viewer. Steps to reproduce: 1.run attached reports in web viewer. Expeceted results: preview properly Actual results: Error occour when previewing the reports in web viewer while it works properly in html and PDF
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/util/ExprDataReader2.java
* @param rowLenIs
	 * @param rowInfoIs
	 * @throws DataException
	 */
	ExprDataReader2( RAInputStream rowExprsIs, RAInputStream rowLenIs,
			RAInputStream rowInfoIs ) throws DataException
	{
		this( rowExprsIs, rowLenIs );
		this.rowIndexUtil = new RowIndexUtil( rowInfoIs );
		
		try
		{
			this.rowCount = (int) ( rowInfoIs.length( ) / 4 );
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_LOAD_ERROR,
					e,
					"Result Data" );
		}		
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IExprResultReader#getRowCount()
	 */
	public int getCount( )
	{
		return this.rowCount;
	}