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
e,
					"Result Data" );
		}
		return exprValueMap;
	}
	
	/**
	 * @param absoluteIndex
	 * @throws IOException
	 * @throws DataException
	 */
	private void skipTo( int absoluteIndex ) throws IOException, DataException
	{
		if ( currRowLenReadIndex == absoluteIndex )
			return;
		
		currRowLenReadIndex = absoluteIndex + 1;
		
		rowLenIs.seek( absoluteIndex * 4 );
		
		rowExprsIs.seek( IOUtil.readInt( rowLenIs ) + this.metaOffset );
		rowExprsDis = new DataInputStream( rowExprsIs );
	}
	/**
	 * @throws IOException
	 */
	private Map getValueMap( ) throws IOException
	{
		Map valueMap = new HashMap( );
		int exprCount = IOUtil.readInt( rowExprsDis );