verifies that the given stream starts with a zip structure .
137. HSSFPalette palette = workbook.getCustomPalette();
139. HSSFColor result = palette.findColor(rgbByte[0], rgbByte[1], rgbByte[2]);
141. result = palette.findSimilarColor(rgbByte[0], rgbByte[1], rgbByte[2]);