* in SMB protocol format, handling endianness and data type conversions.
 *
 * @author mbechler
 */
public class SMBUtil {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private SMBUtil() {
    }

    /**
     * Writes a 16-bit integer value to a byte array in little-endian format
     * @param val the value to write

        SMBUtil.writeTime(maxTime, buffer, 32); // changeTime
        SMBUtil.writeInt8(Long.MAX_VALUE, buffer, 40); // endOfFile
        SMBUtil.writeInt8(Long.MAX_VALUE, buffer, 48); // allocationSize
        SMBUtil.writeInt4(Integer.MAX_VALUE, buffer, 56); // extFileAttributes
        SMBUtil.writeInt4(Integer.MAX_VALUE, buffer, 64); // eaSize

        // Decode

        System.arraycopy(SMBUtil.SMB2_HEADER, 0, dst, dstIndex, SMBUtil.SMB2_HEADER.length);

        SMBUtil.writeInt2(this.creditCharge, dst, dstIndex + 6);
        SMBUtil.writeInt2(this.command, dst, dstIndex + 12);
        SMBUtil.writeInt2(this.credit, dst, dstIndex + 14);
        SMBUtil.writeInt4(this.flags, dst, dstIndex + 16);
        SMBUtil.writeInt4(this.nextCommand, dst, dstIndex + 20);

        if (this.largeFile) {
            this.pid = SMBUtil.readInt2(buffer, bufferIndex);
            final int boHigh = SMBUtil.readInt4(buffer, bufferIndex + 4);
            final int boLow = SMBUtil.readInt4(buffer, bufferIndex + 8);

            this.byteOffset = boHigh << 32 | boLow;

            final int lHigh = SMBUtil.readInt4(buffer, bufferIndex + 12);
            final int lLow = SMBUtil.readInt4(buffer, bufferIndex + 16);

        this.creationTime = SMBUtil.readTime(buffer, bufferIndex);
        bufferIndex += 8;
        this.lastAccessTime = SMBUtil.readTime(buffer, bufferIndex);
        bufferIndex += 8;
        this.lastWriteTime = SMBUtil.readTime(buffer, bufferIndex);
        bufferIndex += 8;
        this.changeTime = SMBUtil.readTime(buffer, bufferIndex);
        bufferIndex += 8;

        this.allocationSize = SMBUtil.readInt8(buffer, bufferIndex);

        bufferIndex++;
        this.type = SMBUtil.readInt2(buffer, bufferIndex);
        bufferIndex += 2;
        final int ownerUOffset = SMBUtil.readInt4(buffer, bufferIndex); // offset to owner sid
        bufferIndex += 4;
        final int ownerGOffset = SMBUtil.readInt4(buffer, bufferIndex); // offset to group sid
        bufferIndex += 4;
        SMBUtil.readInt4(buffer, bufferIndex); // offset to sacl

        final int start = bufferIndex;
        this.alloc = SMBUtil.readInt8(buffer, bufferIndex);
        bufferIndex += 8;

        this.free = SMBUtil.readInt8(buffer, bufferIndex);
        bufferIndex += 8;

        this.sectPerAlloc = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        this.bytesPerSect = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        int start = dstIndex;

        // Compression count (2 bytes)
        SMBUtil.writeInt2(this.compressionAlgorithms.length, dst, dstIndex);
        dstIndex += 2;

        // Padding (2 bytes)
        SMBUtil.writeInt2(0, dst, dstIndex);
        dstIndex += 2;

        // Flags (4 bytes)
        SMBUtil.writeInt4(this.flags, dst, dstIndex);
        dstIndex += 4;

        SMBUtil.writeInt4(this.totalParameterCount, dst, dstIndex);
        dstIndex += 4;
        SMBUtil.writeInt4(this.totalDataCount, dst, dstIndex);
        dstIndex += 4;
        if (this.getCommand() != SMB_COM_NT_TRANSACT_SECONDARY) {
            SMBUtil.writeInt4(this.maxParameterCount, dst, dstIndex);
            dstIndex += 4;
            SMBUtil.writeInt4(this.maxDataCount, dst, dstIndex);

        assertEquals(expectedIndexNumber, SMBUtil.readInt8(destinationBuffer, 0));
    }

    @Test
    @DisplayName("Test encode with buffer offset")
    void testEncodeWithBufferOffset() throws SMBProtocolDecodingException {
        // First decode to set internal state
        byte[] sourceBuffer = new byte[8];
        long expectedIndexNumber = 0xAABBCCDDEEFF1122L;
        SMBUtil.writeInt8(expectedIndexNumber, sourceBuffer, 0);