}

    @Test
    void testReadULong() {
        // Test readULong with various values
        byte[] data = new byte[8];
        ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);

        // Test with a positive value
        buffer.putInt(0, 0x12345678);
        assertEquals(0x12345678, NtlmMessage.readULong(data, 0), "Should read positive ULong correctly.");

        // Test with zero

        }
        pos += 8;

        if (readULong(input, pos) != NTLMSSP_TYPE2) {
            throw new IOException("Not a Type 2 message.");
        }
        pos += 4;

        final int flags = readULong(input, pos + 8);
        setFlags(flags);

        final byte[] targetName = readSecurityBuffer(input, pos);
        final int targetNameOff = readULong(input, pos + 4);
        if (targetName.length != 0) {

            }
        }
        if (readULong(material, 8) != 3) {
            throw new IOException("Not a Type 3 message.");
        }
        final byte[] lmResponse = readSecurityBuffer(material, 12);
        final int lmResponseOffset = readULong(material, 16);
        final byte[] ntResponse = readSecurityBuffer(material, 20);
        final int ntResponseOffset = readULong(material, 24);

        final int ntResponseOffset = readULong(material, pos + 4);
        pos += 8;

        final byte[] domainBytes = readSecurityBuffer(material, pos);
        final int domainOffset = readULong(material, pos + 4);
        pos += 8;

        final byte[] userBytes = readSecurityBuffer(material, pos);
        final int userOffset = readULong(material, pos + 4);
        pos += 8;

                throw new IOException("Not an NTLMSSP message.");
            }
        }
        if (readULong(material, 8) != 2) {
            throw new IOException("Not a Type 2 message.");
        }
        final int flags = readULong(material, 20);
        setFlags(flags);
        String target = null;
        byte[] bytes = readSecurityBuffer(material, 12);

            // Verify message type
            assertEquals(Type2Message.NTLMSSP_TYPE2, Type2Message.readULong(bytes, 8));
            // Verify flags
            assertEquals(message.getFlags(), Type2Message.readULong(bytes, 20));
        }

        @Test
        @DisplayName("toByteArray should include challenge and context correctly")

      val prefix = header.readByteString(PREFIX_CLEAN.size.toLong())
      if (prefix != PREFIX_CLEAN) throw IOException("unreadable cache file")
      val upstreamSize = header.readLong()
      val metadataSize = header.readLong()

      // Read the metadata.
      val metadataBuffer = Buffer()
      fileOperator.read(FILE_HEADER_SIZE + upstreamSize, metadataBuffer, metadataSize)

    if (frameLength == PAYLOAD_SHORT.toLong()) {
      frameLength = (source.readShort() and 0xffff).toLong() // Value is unsigned.
    } else if (frameLength == PAYLOAD_LONG.toLong()) {
      frameLength = source.readLong()
      if (frameLength < 0L) {
        throw ProtocolException(
          "Frame length 0x${frameLength.toHexString()} > 0x7FFFFFFFFFFFFFFF",
        )
      }
    }

        if (read(tmp, 0, 4) < 0) {
            throw new SmbException("EOF");
        }
        return Encdec.dec_uint32be(tmp, 0);
    }

    @Override
    public final long readLong() throws SmbException {
        if (read(tmp, 0, 8) < 0) {
            throw new SmbException("EOF");
        }
        return Encdec.dec_uint64be(tmp, 0);
    }

    @Override

    if (bytesLeft == 0L) throw ProtocolException("unexpected length: $bytesLeft at $this")
    val byteArray = source.readByteArray(bytesLeft)
    return BigInteger(byteArray)
  }

  fun readLong(): Long {
    if (bytesLeft !in 1..8) throw ProtocolException("unexpected length: $bytesLeft at $this")

    var result = source.readByte().toLong() // No "and 0xff" because this is a signed value!