bufferIndex += 4;

            if (numAces > 4096)
                throw new IOException( "Invalid SecurityDescriptor" );

            aces = new ACE[numAces];
            for (int i = 0; i < numAces; i++) {
                aces[i] = new ACE();
                bufferIndex += aces[i].decode(buffer, bufferIndex);
            }
        } else {
            aces = null;
        }

            if ( numAces > 4096 )
                throw new SMBProtocolDecodingException("Invalid SecurityDescriptor");

            this.aces = new ACE[numAces];
            for ( int i = 0; i < numAces; i++ ) {
                this.aces[ i ] = new ACE();
                bufferIndex += this.aces[ i ].decode(buffer, bufferIndex, len - bufferIndex);
            }
        }
        else {
            this.aces = null;