counter.write(data);
    written += 10;
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    counter.write(data, 0, 5);
    written += 5;
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    counter.write(data, 2, 5);
    written += 5;
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

        Arrays.fill(dst, (byte) 0x55);

        // Act
        int written = enc.encode(dst, dstIndex);

        // Assert: reported written bytes matches size() and requested len.
        assertEquals(len, enc.size(), "size() must equal provided length");
        assertEquals(len, written, "encode() must return number of bytes written");

        // Assert: copied region equals the source slice.

        }

        int written = trans2SetFileInfo.writeDataWireFormat(buffer, 0);

        // Should report 26 bytes written (20 from encode + 6 increment)
        assertEquals(26, written);

        // Check that padding bytes are zeros
        // The implementation writes 8 bytes with writeInt8 but only increments by 6
        // This means bytes 20-27 will be zero (8 bytes written by writeInt8)

        assertEquals(smbComNtTransaction.parameterOffset, SmbComTransaction.readInt4(dst, 23),
                "parameterOffset should be written correctly");
        assertEquals(smbComNtTransaction.dataCount, SmbComTransaction.readInt4(dst, 27), "dataCount should be written correctly");
        assertEquals(smbComNtTransaction.dataOffset, SmbComTransaction.readInt4(dst, 31), "dataOffset should be written correctly");

	defer ODirectPoolSmall.Put(bufp)

	written, err := CopyAligned(f, io.LimitReader(r, 5), *bufp, r.Size(), f)
	if !errors.Is(err, io.ErrUnexpectedEOF) {
		t.Errorf("Expected io.ErrUnexpectedEOF, but got %v", err)
	}
	if written != 5 {
		t.Errorf("Expected written to be '5', but got %v", written)
	}

	f.Seek(0, io.SeekStart)
	r.Seek(0, io.SeekStart)

	written, err = CopyAligned(f, r, *bufp, r.Size(), f)

	rw := httptest.NewRecorder()
	trw := &trackingResponseWriter{ResponseWriter: rw}

	if headersAlreadyWritten(trw) {
		t.Fatal("headers have not been written yet")
	}

	trw.WriteHeader(123)
	if !headersAlreadyWritten(trw) {
		t.Fatal("headers were written")
	}
}

func TestHeadersAlreadyWrittenWrapped(t *testing.T) {
	rw := httptest.NewRecorder()
	trw := &trackingResponseWriter{ResponseWriter: rw}

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.Charset;

/**
 * A destination to which bytes can be written, such as a file. Unlike an {@link OutputStream}, a
 * {@code ByteSink} is not an open, stateful stream that can be written to and closed. Instead, it
 * is an immutable <i>supplier</i> of {@code OutputStream} instances.
 *
 * <p>{@code ByteSink} provides two kinds of methods:
 *

        assertEquals(0x00, buffer[4]);
        assertEquals(0x00, buffer[5]);

        // Check that filename is written correctly (starting at offset 6)
        // The filename should be null-terminated Unicode string
        assertTrue(written > 6);

        // Verify the total bytes written is reasonable
        assertTrue(written > TEST_FILENAME.length());
    }

    @ParameterizedTest

     *
     * @param s the short value to encode
     * @param dst the destination byte array
     * @param di the starting index in the destination array
     * @return the number of bytes written (2)
     */
    public static int enc_uint16be(final short s, final byte[] dst, int di) {
        dst[di] = (byte) (s >> 8 & 0xFF);
        di++;
        dst[di] = (byte) (s & 0xFF);
        return 2;
    }

        response = new Trans2QueryFSInformationResponse(config, FileSystemInformation.SMB_INFO_ALLOCATION);

        byte[] buffer = new byte[10];
        int written = response.writeSetupWireFormat(buffer, 0);

        assertEquals(0, written);
    }

    @Test
    void testWriteParametersWireFormat() {
        // Test writeParametersWireFormat returns 0