function stox(wb) {
	var out = [];
	wb.SheetNames.forEach(function(name) {
		var o = {name:name, rows:{}};
		var ws = wb.Sheets[name];
		var aoa = XLSX.utils.sheet_to_json(ws, {raw: false, header:1});
		aoa.forEach(function(r, i) {
			var cells = {};
			r.forEach(function(c, j) { cells[j] = ({ text: c }); });
			o.rows[i] = { cells: cells };
		})
		out.push(o);
	});
	return out;
}

function xtos(sdata) {
	var out = XLSX.utils.book_new();
	sdata.forEach(function(xws) {
		var aoa = [[]];
		var rowobj = xws.rows;
		for(var ri = 0; ri < rowobj.len; ++ri) {
			var row = rowobj[ri];
			if(!row) continue;
			aoa[ri] = [];
			Object.keys(row.cells).forEach(function(k) {
				var idx = +k;
				if(isNaN(idx)) return;
				aoa[ri][idx] = row.cells[k].text;
			});
		}
		var ws = XLSX.utils.aoa_to_sheet(aoa);
		XLSX.utils.book_append_sheet(out, ws, xws.name);
	});
	return out;
}