private static byte[] decodabetFor(char[] chars) {
      byte[] decodabet = new byte[Ascii.MAX + 1];
      Arrays.fill(decodabet, (byte) -1);
      for (int i = 0; i < chars.length; i++) {
        char c = chars[i];
        checkArgument(c < decodabet.length, "Non-ASCII character: %s", c);
        checkArgument(decodabet[c] == -1, "Duplicate character: %s", c);
        decodabet[c] = (byte) i;
      }
      return decodabet;
    }

    testDecodes(base64(), "Zg===", "f");
    testDecodes(base64(), "Zg====", "f");
  }

  public void testBase64InvalidDecodings() {
    // These contain bytes not in the decodabet.
    assertFailsToDecode(base64(), "A\u007f", "Unrecognized character: 0x7f");
    assertFailsToDecode(base64(), "Wf2!", "Unrecognized character: !");
    // This sentence just isn't base64() encoded.

/**
 * Interface for objects that can be decoded from a byte buffer.
 * This interface provides methods for deserializing data from SMB protocol messages.
 *
 * @author mbechler
 */
public interface Decodable {

    /**
     * Decode data from a byte buffer
     *
     * @param buffer the byte buffer containing the data to decode
     * @param bufferIndex the starting index in the buffer

        bufferIndex += 4;
        final Decodable i = createInformation(this.expectInfoType, this.expectInfoClass);
        if (i != null) {
            i.decode(buffer, bufferOffset, bufferLength);
        }
        bufferIndex = Math.max(bufferIndex, bufferOffset + bufferLength);
        this.info = i;
        return bufferIndex - start;
    }

package jcifs.internal.smb2.ioctl;

import jcifs.Decodable;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 SRV_REQUEST_RESUME_KEY response data structure. This structure contains a resume key
 * that can be used for server-side copy operations.
 *
 * @author mbechler
 *
 */
public class SrvRequestResumeKeyResponse implements Decodable {

    /**

        return bufferIndex - start;
    }

    /**
     * Creates a decodable object for the output data based on the control code.
     *
     * @return the appropriate decodable object for the control code, or null if not recognized
     */
    protected Decodable createOutputDecodable() {
        switch (this.ctlCode) {
        case Smb2IoctlRequest.FSCTL_DFS_GET_REFERRALS:

 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.fscc;

import jcifs.Decodable;
import jcifs.internal.AllocInfo;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.util.SMBUtil;

/**

import org.junit.jupiter.api.Test;
import org.mockito.Mock;

import jcifs.internal.SMBProtocolDecodingException;

/**
 * Test class for Decodable interface functionality
 */
@DisplayName("Decodable Interface Tests")
class DecodableTest extends BaseTest {

    @Mock
    private Decodable mockDecodable;

    @Test
    @DisplayName("Should define decode method")
    void testDecodeMethod() throws SMBProtocolDecodingException {

 */
package jcifs.internal.smb2.create;

import jcifs.Decodable;

/**
 * SMB2 Create Context response interface. This interface defines the contract for
 * context data returned in SMB2 Create responses.
 *
 * @author mbechler
 *
 */
public interface CreateContextResponse extends Decodable {

    /**
     * Get the name of this create context.
     * @return context name as byte array

 */
package jcifs.internal.smb2.nego;

import jcifs.Decodable;

/**
 * SMB2 Negotiate Context response data structure.
 *
 * This class represents negotiate contexts returned by the server
 * in response to negotiate context requests.
 *
 * @author mbechler
 */
public interface NegotiateContextResponse extends Decodable {

    /**
     * Gets the negotiate context type.
     *