if (rem == 0) {
            return 0;
        }
        return 8 - rem;
    }

    @Override
    public int decode(final byte[] buffer, final int bufferIndex) throws SMBProtocolDecodingException {
        return decode(buffer, bufferIndex, false);
    }

    /**
     * Decodes the SMB2 message from the buffer.
     *
     * @param buffer the buffer containing the message

# JSON Compatible Encoder { #json-compatible-encoder }

There are some cases where you might need to convert a data type (like a Pydantic model) to something compatible with JSON (like a `dict`, `list`, etc).

For example, if you need to store it in a database.

For that, **FastAPI** provides a `jsonable_encoder()` function.

## Using the `jsonable_encoder` { #using-the-jsonable-encoder }

                readn(this.in, buffer, Smb2Constants.SMB2_HEADER_LENGTH, rl - Smb2Constants.SMB2_HEADER_LENGTH);

                len = cur.decode(buffer, 0, true);
                if (len > rl) {
                    throw new IOException(String.format("WHAT? ( read %d decoded %d ): %s", rl, len, cur));
                }
                if (nextCommand != 0 && len > nextCommand) {

                dstIndex += 2;
            }
        }
        return dstIndex - start;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.Decodable#decode(byte[], int, int)
     */
    @Override
    public int decode(final byte[] buffer, int bufferIndex, final int len) throws SMBProtocolDecodingException {
        final int start = bufferIndex;
        final int nciphers = SMBUtil.readInt2(buffer, bufferIndex);

        return dstIndex - start;
    }

    /**
     * Decode a transform header from byte array
     *
     * @param buffer
     *            buffer to decode from
     * @param bufferIndex
     *            offset in buffer
     * @return new transform header instance
     */
    public static Smb2TransformHeader decode(final byte[] buffer, int bufferIndex) {

        int encodedSize = context.encode(buffer, 0);

        // Create new context for decoding
        CompressionNegotiateContext decodedContext = new CompressionNegotiateContext();
        int decodedSize = decodedContext.decode(buffer, 0, encodedSize);

        assertEquals(encodedSize, decodedSize);
        assertArrayEquals(context.getCompressionAlgorithms(), decodedContext.getCompressionAlgorithms());

## Convert any Data to JSON-compatible { #convert-any-data-to-json-compatible }

To convert any data to JSON-compatible, read the docs for [Tutorial - JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

## OpenAPI Metadata - Docs { #openapi-metadata-docs }

    public char[] decryptFromString(String encryptedString) throws GeneralSecurityException {
        if (encryptedString == null) {
            return null;
        }
        byte[] encrypted = Base64.getDecoder().decode(encryptedString);
        return decryptCredentials(encrypted);
    }

    /**
     * Get the salt used for key derivation
     *
     * @return salt bytes
     */
    public byte[] getSalt() {

     *            NT password hash, hex encoded
     */
    public NtlmNtHashAuthenticator(final String domain, final String username, final String passwordHashHex) {
        this(domain, username, Hex.decode(passwordHashHex));
    }

    private NtlmNtHashAuthenticator(final byte[] passwordHash) {
        this.ntHash = passwordHash;
    }

    /**
     * {@inheritDoc}
     *

            final String challenge) throws NTLMEngineException {
        Type2Message type2Message;
        try {
            type2Message = new Type2Message(Base64.getDecoder().decode(challenge));
        } catch (final IOException exception) {
            throw new NTLMEngineException("Invalid NTLM type 2 message", exception);
        }
        final int type2Flags = type2Message.getFlags();