From 6b668fd04eab12d087a919a4e1f27e7b250b9ced Mon Sep 17 00:00:00 2001
From: TataMata <bernard.cupic@gmail.com>
Date: Mon, 6 Nov 2017 12:00:51 +0100
Subject: [PATCH] Fix for the "index out of bounds" exception while reading
 styles

There was a bug introduced in version 1.2 in reading styles. As from the Office Open XML documentation:
Every cell will have a reference to one <xf> in the <cellXfs> collection. This is direct formatting for the cell. To apply a style to the cell, the <xf> references the style using the xfId attribute. The xfId attribute is an index into the <cellStyleXFs> collection, which collects the cell styles available to the user. The <cellStyleXFs> contains one <xf> for each style. Each such <xf> is tied to its name via an index (in its xfId attribute) from the <cellStyles> collection.
Existing implementation simply tried to fetch a style name by using index in the styles vector causing an index_out_of_range exception for each xfId that was ot of bounds of cellStyles collection. What was needed is to match the xfId attribute of the cellStyle element.