public short getInt16(int offset) {
            return data.getShort(offset);
        }
Parse the orientation from the image header. If it doesn't handle this image type (or this is not an image)
it will return a default value rather than throwing an exception.

@return The exif orientation if present or -1 if the header couldn't be parsed or doesn't contain an orientation
@throws IOException
core/src/main/java/com/bumptech/glide/load/resource/bitmap/ImageHeaderParser.java