void testReadDataWireFormatWithOffset() {
            byte[] fullBuffer = new byte[200];
            byte[] dfsData = createValidDfsReferralBuffer();
            int offset = 50;
            System.arraycopy(dfsData, 0, fullBuffer, offset, dfsData.length);

            int bytesRead = response.readDataWireFormat(fullBuffer, offset, dfsData.length);

            assertTrue(bytesRead > 0);

                }
                foundEnd = true;
                break;
            }

            final byte[] raw = new byte[avLen];
            System.arraycopy(data, pos, raw, 0, avLen);
            pairs.add(parseAvPair(avId, raw));

            pos += avLen;
        }
        if (!foundEnd) {
            throw new CIFSException("Missing AvEOL");
        }

        // Verify capabilities (4 bytes)
        assertEquals(DEFAULT_CAPABILITIES, SMBUtil.readInt4(buffer, 0));

        // Verify client GUID (16 bytes)
        byte[] extractedGuid = new byte[16];
        System.arraycopy(buffer, 4, extractedGuid, 0, 16);
        assertArrayEquals(defaultClientGuid, extractedGuid);

        // Verify security mode (2 bytes)
        assertEquals(DEFAULT_SECURITY_MODE, SMBUtil.readInt2(buffer, 20));

        byte[] buffer = new byte[512];
        int headerStart = 0;
        int bodyStart = Smb2Constants.SMB2_HEADER_LENGTH;

        // Write SMB2 header (64 bytes)
        // Protocol ID
        System.arraycopy(new byte[] { (byte) 0xFE, 'S', 'M', 'B' }, 0, buffer, headerStart, 4);
        // Structure size (64)
        SMBUtil.writeInt2(64, buffer, headerStart + 4);
        // Credit charge

        if ((peekct & CT_ALPHA) != 0) {
            int i = 0;
            do {
                if (i >= buf.length) {
                    final char[] nb = new char[buf.length * 2];
                    System.arraycopy(buf, 0, nb, 0, buf.length);
                    buf = nb;
                }
                buf[i++] = (char) peekc;
                peekc = read();

                // Copy data to the buffer that was passed in the response constructor
                byte[] testData = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
                System.arraycopy(testData, 0, response.b, response.off, testData.length);
                return null;
            }
        }).when(smbFile).send(any(SmbComReadAndX.class), any(SmbComReadAndXResponse.class));

        final int length = readUShort(src, index);
        final int offset = readULong(src, index + 4);
        final byte[] buffer = new byte[length];
        System.arraycopy(src, offset, buffer, 0, length);
        return buffer;
    }

    static void writeULong(final byte[] dest, final int offset, final int ulong) {
        dest[offset] = (byte) (ulong & 0xff);

            System.arraycopy(password, 0, dst, dstIndex, passwordLength);
            dstIndex += passwordLength;
        } else {
            // no password in tree connect
            dst[dstIndex++] = (byte) 0x00;
        }
        dstIndex += writeString(path, dst, dstIndex);
        try {
            System.arraycopy(service.getBytes("ASCII"), 0, dst, dstIndex, service.length());

      if (initialBytes == null) {
        return checkNotNull(bytes);
      } else {
        byte[] result = new byte[initialBytes.length + bytes.length];
        System.arraycopy(initialBytes, 0, result, 0, initialBytes.length);
        System.arraycopy(bytes, 0, result, initialBytes.length, bytes.length);
        return result;
      }
    }

    @Override
    public byte[] getSinkContents() throws IOException {

        mac.update(seqBytes); // sequence
        mac.update(data); // data
        final byte[] dgst = mac.digest();
        byte[] trunc = new byte[8];
        System.arraycopy(dgst, 0, trunc, 0, 8);

        if (log.isDebugEnabled()) {
            log.debug("Digest " + Hexdump.toHexString(dgst));
            log.debug("Truncated " + Hexdump.toHexString(trunc));
        }