internal const val B1_MASK_LENGTH = 127

  internal const val OPCODE_CONTINUATION = 0x0
  internal const val OPCODE_TEXT = 0x1
  internal const val OPCODE_BINARY = 0x2

  internal const val OPCODE_CONTROL_CLOSE = 0x8
  internal const val OPCODE_CONTROL_PING = 0x9
  internal const val OPCODE_CONTROL_PONG = 0xa

  /**
   * Maximum length of frame payload. Larger payloads, if supported by the frame type, can use the

     * Notify when file attributes change
     */
    public static final int FILE_NOTIFY_CHANGE_ATTRIBUTES = 0x4;
    /**
     * Notify when file size changes
     */
    public static final int FILE_NOTIFY_CHANGE_SIZE = 0x8;
    /**
     * Notify when last write time changes
     */
    public static final int FILE_NOTIFY_CHANGE_LAST_WRITE = 0x10;
    /**
     * Notify when last access time changes
     */

     */
    public static final int SMB2_SHAREFLAG_ENCRYPT_DATA = 0x8000;
    /**
     * Share capability indicating DFS support.
     */
    public static final int SMB2_SHARE_CAP_DFS = 0x8;

    /**
     * Share capability indicating continuous availability support.
     */
    public static final int SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY = 0x10;

    /**

    void testOplockLevelConstants() {
        assertEquals((byte) 0x0, Smb2CreateRequest.SMB2_OPLOCK_LEVEL_NONE);
        assertEquals((byte) 0x1, Smb2CreateRequest.SMB2_OPLOCK_LEVEL_II);
        assertEquals((byte) 0x8, Smb2CreateRequest.SMB2_OPLOCK_LEVEL_EXCLUSIVE);
        assertEquals((byte) 0x9, Smb2CreateRequest.SMB2_OPLOCK_LEVEL_BATCH);
        assertEquals((byte) 0xFF, Smb2CreateRequest.SMB2_OPLOCK_LEVEL_LEASE);
    }

    @Test

        assertEquals(0x4, SecurityInfo.DACL_SECURITY_INFO);
    }

    @Test
    @DisplayName("Test SACL_SECURITY_INFO constant value")
    void testSaclSecurityInfo() {
        assertEquals(0x8, SecurityInfo.SACL_SECURITY_INFO);
    }

    @Test
    @DisplayName("Test LABEL_SECURITY_INFO constant value")
    void testLabelSecurityInfo() {
        assertEquals(0x10, SecurityInfo.LABEL_SECURITY_INFO);
    }

    /**
     * Level II oplock
     */
    public static final byte SMB2_OPLOCK_LEVEL_II = 0x1;
    /**
     * Exclusive oplock
     */
    public static final byte SMB2_OPLOCK_LEVEL_EXCLUSIVE = 0x8;
    /**
     * Batch oplock
     */
    public static final byte SMB2_OPLOCK_LEVEL_BATCH = 0x9;
    /**
     * Lease-based oplock
     */
    public static final byte SMB2_OPLOCK_LEVEL_LEASE = (byte) 0xFF;

		0xe0, 0x4b, 0x65, 0xe9, 0x24,
		0x56, 0xd9, 0x88, 0x8b, 0x52, 0xb3, 0x79, 0xbd, 0xfb, 0xd5, 0x1e, 0xe8,
		0x69, 0xef, 0x1f, 0xf, 0xc6, 0x5b, 0x66, 0x59, 0x69, 0x5b, 0x6c, 0xce,
		0x8, 0x17, 0x23,
	}) {
		t.Fatalf("Bad key[0].Y, got %v", key0.Y.Bytes())
	} else if key1.E != 0x10001 {
		t.Fatalf("Bad key[1].E: %d", key1.E)
	} else if !bytes.Equal(key1.N.Bytes(), []byte{

0xa8, 0x19, 0x3b, 0x8a, 0x5b, 0xa, 0x51, 0x77, 0xc5, 0x78, 0x27, 0xc1, 0xeb, 0x4e, 0x90, 0x3f, 0xac, 0xff, 0xfb, 0x81, 0x7d, 0x8, 0x4a, 0xf8, 0x27, 0xb0, 0x98, 0xbc, 0xcb, 0x87, 0xdd, 0x77, 0xad, 0x66, 0x7e, 0x74, 0xff, 0xb6, 0x3f, 0x6a, 0x93, 0x26, 0xeb, 0xa7, 0x83, 0xc9, 0x1f, 0x5c, 0x4c, 0xb0, 0x1a, 0xfe, 0x61, 0x8, 0xad, 0x47, 0x3e, 0x58, 0x8e, 0xe9, 0x2e, 0x1a, 0x31, 0x8, 0x82, 0x78, 0x7, 0xcc, 0x87, 0xe5, 0x29, 0x6a, 0xf0, 0xd5, 0xcc, 0x8d, 0x91, 0x46, 0xd, 0xb5, 0xb0, 0x74, 0x73, 0xc1, 0x23,...

func (h *FileHeader) isZip64() bool {
	return h.CompressedSize64 >= uint32max || h.UncompressedSize64 >= uint32max
}

func (h *FileHeader) hasDataDescriptor() bool {
	return h.Flags&0x8 != 0
}

func msdosModeToFileMode(m uint32) (mode fs.FileMode) {
	if m&msdosDir != 0 {
		mode = fs.ModeDir | 0777
	} else {
		mode = 0666
	}
	if m&msdosReadOnly != 0 {
		mode &^= 0222
	}

		// even when compressing an empty string.
		fh.Method = Store
		fh.Flags &^= 0x8 // we will not write a data descriptor

		// Explicitly clear sizes as they have no meaning for directories.
		fh.CompressedSize = 0
		fh.CompressedSize64 = 0
		fh.UncompressedSize = 0
		fh.UncompressedSize64 = 0

		ow = dirWriter{}
	} else {
		fh.Flags |= 0x8 // we will write a data descriptor

		fw = &fileWriter{
			zipw:      w.cw,