void testDecodeValidResumeKey() throws SMBProtocolDecodingException {
        // Prepare test data - 24 bytes for resume key + 4 bytes for context length
        byte[] buffer = new byte[28];

        // Fill resume key with test pattern
        for (int i = 0; i < 24; i++) {
            buffer[i] = (byte) (i + 1);
        }

        // Add context length (reserved) - 4 bytes
        buffer[24] = 0x00;

#
#  Licensed to the Apache Software Foundation (ASF) under one or more
#  contributor license agreements.  See the NOTICE file distributed with
#  this work for additional information regarding copyright ownership.
#  The ASF licenses this file to You under the Apache License, Version 2.0
#  (the "License"); you may not use this file except in compliance with
#  the License.  You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0

        Encodable enc = new ByteEncodable(src, off, len);

        // Destination has guard space to verify non-overwritten regions.
        byte[] dst = new byte[dstIndex + len + 5];
        Arrays.fill(dst, (byte) 0x55);

        // Act
        int written = enc.encode(dst, dstIndex);

        // Assert: reported written bytes matches size() and requested len.

     */
    private static byte[] newBuffer(int length) {
        // initialise with distinct pattern to detect unused trailing bytes
        byte[] buf = new byte[length];
        Arrays.fill(buf, (byte) 0xFF);
        return buf;
    }

    @Test
    @DisplayName("constructor initialises command and parameters correctly")
    void testConstructorInitialisesFields() throws Exception {
        int level = 42;

    void testReadDataWireFormatVariousSizes(int dataSize) throws SMBProtocolDecodingException {
        // Test with various data sizes within buffer limit
        byte[] testData = new byte[dataSize];
        Arrays.fill(testData, (byte) 0xAB);
        byte[] buffer = new byte[dataSize + 100];
        System.arraycopy(testData, 0, buffer, 20, dataSize);

        int result = response.readDataWireFormat(buffer, 20, dataSize);

#
#  Licensed to the Apache Software Foundation (ASF) under one or more
#  contributor license agreements.  See the NOTICE file distributed with
#  this work for additional information regarding copyright ownership.
#  The ASF licenses this file to You under the Apache License, Version 2.0
#  (the "License"); you may not use this file except in compliance with
#  the License.  You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0

            byte[] dgst = md.digest(data);
            mac.reset();
            mac.init(new SecretKeySpec(dk, HMAC_KEY));
            return mac.doFinal(dgst);
        } finally {
            Arrays.fill(dk, 0, dk.length, (byte) 0);
        }
    }

    private static int mapArcfourMD5KeyUsage(int keyusage) {
        int ms_usage = keyusage;
        switch (ms_usage) {
        case 3:
            ms_usage = 8;

    @Override
    public void releaseBuffer(final byte[] buf) {
        if (buf == null) {
            return;
        }
        // better safe than sorry: prevent leaks if there is some out of bound access
        Arrays.fill(buf, (byte) 0);
        synchronized (this.cache) {
            if (this.freeBuffers < this.cache.length) {
                for (int i = 0; i < this.cache.length; i++) {
                    if (this.cache[i] == null) {

<!---
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *