* <p>
     * Continues an MD4 message digest operation, by filling the buffer,
     * transform(ing) data in 512-bit message block(s), updating the variables
     * context and count, and leaving (buffering) the remaining bytes in buffer
     * for the next update or finish.
     *
     * @param    input    input block
     * @param    offset    start of meaningful bytes in input

            // The final response in the compounded response chain will have NextCommand equal to 0,
            // and it MUST be processed as an individual message of a size equal to the number of bytes
            // remaining in this receive.
            int rem = this.readSize - this.length;
            len += rem;
        }

        haveResponse(buffer, start, len);

        if ( this.nextCommand != 0 && this.next != null ) {

                        log.debug("Breaking on error " + resp);
                    }
                    break;
                }

                if ( nextHead != null ) {
                    // prepare remaining
                    // (e.g. set session/tree/fileid returned by the previous requests)
                    resp.prepare(nextHead);
                }
                curHead = nextHead;
            }