/// <summary>
        /// parse an ODS packet which contain the image data
        /// </summary>
        /// <param name="buffer">raw byte date, starting right after segment</param>
        /// <param name="segment">object containing info about the current segment</param>
        /// <returns>true if this is a valid new object (neither invalid nor a fragment)</returns>
        private static OdsData ParseOds(byte[] buffer, SupSegment segment, bool forceFirst)
        {
            int objId = BigEndianInt16(buffer, 0);      // 16bit object_id
            int objVer = buffer[2];     // 16bit object_id nikse - index 2 or 1???
            int objSeq = buffer[3];     // 8bit  first_in_sequence (0x80),
            // last_in_sequence (0x40), 6bits reserved
            bool first = ((objSeq & 0x80) == 0x80) || forceFirst;
            bool last = (objSeq & 0x40) == 0x40;

            var info = new ImageObjectFragment();
            if (first)
            {
                int width = BigEndianInt16(buffer, 7);      // object_width
                int height = BigEndianInt16(buffer, 9);     // object_height

                info.ImagePacketSize = segment.Size - 11; // Image packet size (image bytes)
                info.ImageBuffer = new byte[info.ImagePacketSize];
                Buffer.BlockCopy(buffer, 11, info.ImageBuffer, 0, info.ImagePacketSize);

                return new OdsData
                {
                    IsFirst = true,
                    Size = new Size(width, height),
                    ObjectId = objId,
                    ObjectVersion = objVer,
                    Fragment = info,
                    Message = "ObjId: " + objId + ", ver: " + objVer + ", seq: first" + (last ? "/" : "") + (last ? "" + "last" : "") + ", width: " + width + ", height: " + height,
                };
            }
            else
            {
                info.ImagePacketSize = segment.Size - 4;
                info.ImageBuffer = new byte[info.ImagePacketSize];
                Buffer.BlockCopy(buffer, 4, info.ImageBuffer, 0, info.ImagePacketSize);

                return new OdsData
                {
                    IsFirst = false,
                    ObjectId = objId,
                    ObjectVersion = objVer,
                    Fragment = info,
                    Message = "Continued ObjId: " + objId + ", ver: " + objVer + ", seq: " + (last ? "" + "last" : ""),
                };
            }
        }