*/
    public void setReadFlags ( byte readFlags ) {
        this.readFlags = readFlags;
    }


    /**
     * @param readLength
     *            the readLength to set
     */
    public void setReadLength ( int readLength ) {
        this.readLength = readLength;
    }


    /**
     * @param offset
     *            the offset to set
     */
    public void setOffset ( long offset ) {

        int ftag = in.read();
        int tag = readTagNumber(in, ftag);
        if ( tag != expectTag ) {
            throw new IOException("Unexpected tag " + tag);
        }
        int length = readLength(in, limit, false);
        byte[] content = new byte[length];
        in.read(content);
        return content;
    }

    // shamelessly stolen from BC ASN1InputStream

        return ( ( src[ srcIndex ] & 0xFF ) << 24 ) + ( ( src[ srcIndex + 1 ] & 0xFF ) << 16 ) + ( ( src[ srcIndex + 2 ] & 0xFF ) << 8 )
                + ( src[ srcIndex + 3 ] & 0xFF );
    }


    static int readLength ( byte[] src, int srcIndex ) {
        srcIndex++;
        return ( ( src[ srcIndex++ ] & 0x01 ) << 16 ) + ( ( src[ srcIndex++ ] & 0xFF ) << 8 ) + ( src[ srcIndex++ ] & 0xFF );
    }

                case SessionServicePacket.SESSION_KEEP_ALIVE:
                    break;
                case SessionServicePacket.SESSION_MESSAGE:
                    bip = SessionServicePacket.readLength( header, 0 );
                    break;
                case -1:
                    if( tot > 0 ) {
                        return tot;
                    }
                    return -1;
            }

                (( src[srcIndex + 1] & 0xFF ) << 16 ) +
                (( src[srcIndex + 2] & 0xFF ) << 8 ) +
                ( src[srcIndex + 3] & 0xFF );
    }
    static int readLength( byte[] src, int srcIndex ) {
        srcIndex++;
        return (( src[srcIndex++] & 0x01 ) << 16 ) +
                (( src[srcIndex++] & 0xFF ) << 8 ) +
                ( src[srcIndex++] & 0xFF );
    }