int type = SMBUtil.readInt2(buffer, ncpos);
                int dataLen = SMBUtil.readInt2(buffer, ncpos + 2);
                ncpos += 4;
                ncpos += 4; // Reserved
                NegotiateContextResponse ctx = createContext(type);
                if ( ctx != null ) {
                    ctx.decode(buffer, ncpos, dataLen);
                    contexts[ i ] = ctx;
                }