* used in query file system information operations, with constants for information levels.
 *
 * @author mbechler
 */
public interface FileSystemInformation extends Decodable {

    /**
     * SMB information allocation constant.
     */
    byte SMB_INFO_ALLOCATION = -1;

    /**
     * File system size information constant.
     */

        @Test
        @DisplayName("Should implement FileSystemInformation interface")
        void shouldImplementFileSystemInformation() {
            // Verify that AllocInfo extends FileSystemInformation
            assertTrue(FileSystemInformation.class.isAssignableFrom(AllocInfo.class));
        }

        @Test
        @DisplayName("Should implement Decodable interface through FileSystemInformation")
        void shouldImplementDecodableInterface() {

        assertEquals((byte) -1, FileSystemInformation.SMB_INFO_ALLOCATION);
        assertEquals((byte) 3, FileSystemInformation.FS_SIZE_INFO);
        assertEquals((byte) 7, FileSystemInformation.FS_FULL_SIZE_INFO);
    }

    // Helper methods

    private void setInfoField(Trans2QueryFSInformationResponse response, FileSystemInformation info) {
        try {

        trans2QueryFSInfo = new Trans2QueryFSInformation(mockConfig, FileSystemInformation.SMB_INFO_ALLOCATION);

        assertNotNull(trans2QueryFSInfo);
    }

    @Test
    @DisplayName("Test concurrent access")
    void testConcurrentAccess() throws InterruptedException {
        trans2QueryFSInfo = new Trans2QueryFSInformation(config, FileSystemInformation.SMB_INFO_ALLOCATION);

        final int THREAD_COUNT = 10;

            assertEquals((byte) 7, FileSystemInformation.FS_FULL_SIZE_INFO);
        }

        @Test
        @DisplayName("Should have distinct constant values")
        void testConstantUniqueness() {
            assertNotEquals(FileSystemInformation.SMB_INFO_ALLOCATION, FileSystemInformation.FS_SIZE_INFO);
            assertNotEquals(FileSystemInformation.SMB_INFO_ALLOCATION, FileSystemInformation.FS_FULL_SIZE_INFO);

    }

    /**
     * @param il
     * @return
     */
    private static int mapInformationLevel(final int il) {
        switch (il) {
        case FileSystemInformation.SMB_INFO_ALLOCATION:
            return 0x1;
        case FileSystemInformation.FS_SIZE_INFO:
            return 0x103;
        }
        throw new IllegalArgumentException("Unhandled information level");
    }

    @Override

     */
    private static Decodable createFilesystemInformation(final byte infoClass) throws SMBProtocolDecodingException {
        return switch (infoClass) {
        case FileSystemInformation.FS_FULL_SIZE_INFO -> new FileFsFullSizeInformation();
        case FileSystemInformation.FS_SIZE_INFO -> new FileFsSizeInformation();
        default -> throw new SMBProtocolDecodingException("Unknown filesystem info class " + infoClass);
        };
    }

        AllocInfo inf;
        switch (this.informationLevel) {
        case FileSystemInformation.SMB_INFO_ALLOCATION:
            inf = new SmbInfoAllocation();
            break;
        case FileSystemInformation.FS_SIZE_INFO:
            inf = new FileFsSizeInformation();
            break;
        case FileSystemInformation.FS_FULL_SIZE_INFO:
            inf = new FileFsFullSizeInformation();
            break;

 * actual free allocation units, sectors per allocation unit, and bytes per sector.
 */
public class FileFsFullSizeInformation implements AllocInfo, FileSystemInformation, Decodable {

    private long alloc; // Also handles SmbQueryFSSizeInfo
    private long free;
    private int sectPerAlloc;
    private int bytesPerSect;

    /**

    /**
     * Default constructor for decoding file system size information.
     */
    public FileFsSizeInformation() {
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.fscc.FileSystemInformation#getFileSystemInformationClass()
     */
    @Override
    public byte getFileSystemInformationClass() {
        return FS_SIZE_INFO;
    }

    @Override
    public long getCapacity() {