public void testEncodeRoundTrip() throws NdrException {
        final long original = 0x1122334455667788L;
        NdrHyper hyper = new NdrHyper(original);
        // Create buffer with extra space for alignment
        NdrBuffer buf = new NdrBuffer(new byte[16], 0);
        hyper.encode(buf);
        // Reset buffer position for decoding
        buf.reset();
        NdrHyper decoded = new NdrHyper(0);

     * to the buffer and that alignment is respected.
     */
    @Test
    void encodeWritesCorrectBytesAndAlignment() throws NdrException {
        NdrShort ns = new NdrShort(0xABCD); // value & 0xFF => 0xCD
        buf.reset();
        int startIndex = buf.getIndex();
        ns.encode(buf);

        // Find where the actual data starts (after alignment)
        int alignmentBytes = 0;

import java.math.BigInteger;
import java.util.Date;

import jcifs.SmbConstants;
import jcifs.smb.SID;

/**
 * Input stream for reading PAC data structures with proper alignment and byte ordering.
 * Handles little-endian byte order and data alignment requirements of PAC structures.
 */
public class PacDataInputStream {

    private final DataInputStream dis;
    private final int size;

    /**

        smbComOpenAndX.useUnicode = true;
        // For Unicode: 1 byte (initial null in writeBytesWireFormat)
        // + potential 1 byte alignment (in writeString) + fileName.length() * 2 + 2 bytes (terminating nulls)
        // Since headerStart is 0 and dstIndex starts at 1 (after initial null), (1-0)%2=1, so alignment byte added
        // Total: 1 + 1 + 12*2 + 2 = 28 bytes
        byte[] dst = new byte[30]; // Use extra buffer space to avoid index errors

        // Test alignment from position 1 to 4
        byte[] data = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05 };
        PacDataInputStream pdis = createInputStream(data);
        pdis.readByte(); // position is 1
        pdis.align(4);
        assertEquals(1, pdis.available());
        assertEquals(0x05, pdis.readByte());

        // Test no alignment needed

    }

    String readString(final byte[] src, final int srcIndex, int len) {
        String str = null;
        try {
            if (useUnicode) {
                // should Unicode alignment be corrected for here?
                str = new String(src, srcIndex, len, UNI_ENCODING);
            } else {

                /* On NT without Unicode the fileNameLength

    }

    @Override
    public byte[] getName() {
        return CONTEXT_NAME_BYTES;
    }

    @Override
    public int size() {
        // Context header (16) + name length (4) + padding to 8-byte alignment + data (16)
        return 16 + 4 + 4 + STRUCTURE_SIZE;
    }

    @Override
    public int encode(byte[] dst, int dstIndex) {
        int start = dstIndex;

        // Write context header

     */
    public byte[] getFileId() {
        return Arrays.copyOf(fileId, 16);
    }

    @Override
    public int size() {
        // Context header (16) + name length (4) + padding to 8-byte alignment + data (16)
        return 16 + 4 + 4 + STRUCTURE_SIZE;
    }

    @Override
    public int encode(byte[] dst, int dstIndex) {
        int start = dstIndex;

        // Write context header

        writeInt2(0x80 | attributes, dst, dstIndex);
        dstIndex += 2;
        /* 6 zeros observed with NT */
        writeInt8(0L, dst, dstIndex);
        dstIndex += 6;

        /* Also observed 4 byte alignment but we stick
         * with the default for jCIFS which is 2 */

        return dstIndex - start;
    }

    @Override
    int readSetupWireFormat(final byte[] buffer, final int bufferIndex, final int len) {

        final int exp = size();
        final int actual = getLength();
        if (exp != actual) {
            // Log the size mismatch for debugging but don't throw exception
            // This can occur due to padding alignment differences between size8() and pad8()
            if (log.isDebugEnabled()) {
                log.debug("Size calculation mismatch: expected {} but got {} (difference: {})", exp, actual, actual - exp);
            }