@Override
  public boolean wasStreamClosed() {
    return outputStreamClosed;
  }

  @Override
  public OutputStream openStream() throws IOException {
    outputStreamOpened = true;
    bytes.reset(); // truncate
    return new Out();
  }

  private final class Out extends TestOutputStream {

    Out() throws IOException {
      super(bytes, options);
    }

    @Override

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;

/**
 * Modes for opening a file for writing. The default when mode when none is specified is to truncate
 * the file before writing.
 *
 * @author Colin Decker
 */
@J2ktIncompatible
@GwtIncompatible
public enum FileWriteMode {
  /** Specifies that writes to the opened file should append to the end of the file. */

func (b *Buffer) Available() int { return cap(b.buf) - len(b.buf) }

// Truncate discards all but the first n unread bytes from the buffer
// but continues to use the same allocated storage.
// It panics if n is negative or greater than the length of the buffer.
func (b *Buffer) Truncate(n int) {
	if n == 0 {
		b.Reset()
		return
	}
	b.lastRead = opInvalid
	if n < 0 || n > b.Len() {

  public val url: HttpUrl,
  /** All headers. */
  public val headers: Headers,
  /** The body of this request, or null if it has none. This may be truncated. */
  public val body: ByteString?,
  /** The total size of the body of this request (before truncation).*/
  public val bodySize: Long,
  /**

	export AWS_SECRET_ACCESS_KEY=minio123
	aws --endpoint-url http://localhost:"$start_port" s3api create-multipart-upload --bucket bucket --key obj-1 >upload-id.json
	uploadId=$(jq -r '.UploadId' upload-id.json)

	truncate -s 5MiB file-5mib
	for i in {1..2}; do
		aws --endpoint-url http://localhost:"$start_port" s3api upload-part \
			--upload-id "$uploadId" --bucket bucket --key obj-1 \
			--part-number "$i" --body ./file-5mib
	done

						t.Errorf("Test %d: %s: Expected NextMarker to contain a string since listing is truncated, but instead found it to be empty", i+1, instanceType)
					}

					if !testCase.resultL.IsTruncated && resultL.NextMarker != "" {
						if !resultL.IsTruncated || len(resultL.Objects) == 0 {
							t.Errorf("Test %d: %s: Expected NextMarker to be empty since listing is not truncated, but instead found `%v`", i+1, instanceType, resultL.NextMarker)
						}
					}

			}
			opts := sql.WriteCSVOpts{
				FieldDelimiter: []rune(c.fieldDelimiter)[0],
				Quote:          '"',
				QuoteEscape:    '"',
				AlwaysQuote:    false,
			}
			record.WriteCSV(&result, opts)
			result.Truncate(result.Len() - 1)
			result.WriteString(c.recordDelimiter)
		}
		r.Close()
		if err != io.EOF {
			t.Fatalf("Case %d failed with %s", i, err)
		}

		if result.String() != c.content {

	if err != nil {
		w.Close()
		return err
	}

	if written < fileSize && fileSize >= 0 {
		if truncate {
			w.Truncate(0) // zero-in the file size to indicate that its unreadable
		}
		w.Close()
		return errLessData
	} else if written > fileSize && fileSize >= 0 {
		if truncate {
			w.Truncate(0) // zero-in the file size to indicate that its unreadable
		}
		w.Close()
		return errMoreData
	}

type readBadSeeker struct{ io.ReadSeeker }

func (rbs *readBadSeeker) Seek(int64, int) (int64, error) { return 0, fmt.Errorf("illegal seek") }

// TestReadTruncation test the ending condition on various truncated files and
// that truncated files are still detected even if the underlying io.Reader
// satisfies io.Seeker.
func TestReadTruncation(t *testing.T) {
	var ss []string
	for _, p := range []string{
		"testdata/gnu.tar",

		}

		// The prefix field should never appear in the GNU format.
		var blk block
		copy(blk[:], b.Bytes())
		prefix := string(blk.toUSTAR().prefix())
		prefix, _, _ = strings.Cut(prefix, "\x00") // Truncate at the NUL terminator
		if blk.getFormat() == FormatGNU && len(prefix) > 0 && strings.HasPrefix(name, prefix) {
			t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
		}

		tr := NewReader(&b)