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());

        SmbComClose close = new SmbComClose(fid, lastWriteTime);
        byte[] buffer = new byte[10];
        int written = close.writeParameterWordsWireFormat(buffer, 0);
        assertEquals(6, written, "writeParameterWordsWireFormat should return 6");
        // Only compare the first 6 bytes that were actually written
        byte[] actualWritten = new byte[6];
        System.arraycopy(buffer, 0, actualWritten, 0, 6);

        byte[] dst = new byte[2];
        int written = neg.writeParameterWordsWireFormat(dst, 0);
        assertEquals(2, written);
        assertArrayEquals(new byte[] { (byte) 0xFF, (byte) 0xFF }, dst, "Negative sid should wrap to 0xFFFF");
    }

    @Test
    void testWriteParameterWordsWithOffset() {
        byte[] dst = new byte[5];
        int written = instance.writeParameterWordsWireFormat(dst, 3);

    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.

        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:
 *

/**
 * An {@link OutputStream} that maintains a hash of the data written to it.
 *
 * @author Zoe Piepmeier
 * @since 16.0
 */
@Beta
public final class HashingOutputStream extends FilterOutputStream {
  private final Hasher hasher;

  /**
   * Creates an output stream that hashes using the given {@link HashFunction}, and forwards all
   * data written to it to the underlying {@link OutputStream}.
   *