switch src := r.src.(type) {
	case *lockedSource:
		return src.read(p, &r.readVal, &r.readPos)
	case *runtimeSource:
		return src.read(p, &r.readVal, &r.readPos)
	}
	return read(p, r.src, &r.readVal, &r.readPos)
}

func read(p []byte, src Source, readVal *int64, readPos *int8) (n int, err error) {
	pos := *readPos
	val := *readVal
	rng, _ := src.(*rngSource)
	for n = 0; n < len(p); n++ {
		if pos == 0 {

			if _, err := p.readVal(); err != nil {
				return errMalformedVarint
			}
			ln, err := p.readVal()
			if err != nil {
				return err
			}
			if !p.discard(ln) {
				return fmt.Errorf("failed to read trace: %w", io.EOF)
			}
		} else {
			// String dictionary entry [ID, length, string].
			id, err := p.readVal()
			if err != nil {
				return err
			}

// ReadAt blocks until either all the data is available or an error occurs.
// In this respect ReadAt is different from Read.
//
// If the n = len(p) bytes returned by ReadAt are at the end of the
// input source, ReadAt may return either err == EOF or err == nil.
//
// If ReadAt is reading from an input source with a seek offset,
// ReadAt should not affect nor be affected by the underlying

	// Read entire file.
	f, err := t.fsys.Open(file)
	if err != nil {
		t.errorf("%s: Open: %w", file, err)
		return
	}

	data, err := io.ReadAll(f)
	if err != nil {
		f.Close()
		t.errorf("%s: Open+ReadAll: %w", file, err)
		return
	}

	if err := f.Close(); err != nil {
		t.errorf("%s: Close: %w", file, err)
	}

	// Check that closing twice doesn't crash.

	dec := NewDecoder(StdEncoding, strings.NewReader(encoded))
	res1, err := io.ReadAll(dec)
	if err != nil {
		t.Errorf("ReadAll failed: %v", err)
	}

	dec = NewDecoder(StdEncoding, strings.NewReader(encodedShort))
	var res2 []byte
	res2, err = io.ReadAll(dec)
	if err != nil {
		t.Errorf("ReadAll failed: %v", err)
	}

	if !bytes.Equal(res1, res2) {
		t.Error("Decoded results not equal")

					t.Fatalf("unexpected Readall() error: %v", err)
				}
				if !reflect.DeepEqual(out, tt.Output) {
					t.Fatalf("ReadAll() output:\ngot  %q\nwant %q", out, tt.Output)
				}
			}

			// Check input offset after call ReadAll()
			inputByteSize := len(input)
			inputOffset := r.InputOffset()
			if err == nil && int64(inputByteSize) != inputOffset {

	if err != nil {
		t.Fatal(err)
	}
	firstRead = firstRead[:n]

	close(cancel)

	rest, err := io.ReadAll(res.Body)
	all := string(firstRead) + string(rest)
	if all != "Hello" {
		t.Errorf("Read %q (%q + %q); want Hello", all, firstRead, rest)
	}
	if err != ExportErrRequestCanceled {
		t.Errorf("ReadAll error = %v; want %v", err, ExportErrRequestCanceled)
	}
}

	buf := make([]byte, 16)
	n, err := res.Body.Read(buf)
	close(continuec)
	if err != nil || string(buf[:n]) != "one" {
		t.Fatalf("Body.Read = %q, %v, want %q, nil", string(buf[:n]), err, "one")
	}

	got, err := io.ReadAll(res.Body)
	if err != nil || string(got) != "two" {
		t.Fatalf("Body.Read = %q, %v, want %q, nil", string(got), err, "two")
	}
}

func TestResponseControllerHijack(t *testing.T) { run(t, testResponseControllerHijack) }

		done(int64(sz), &err)
	}()

	return xioutil.WithDeadline[[]byte](ctx, globalDriveConfig.GetMaxTimeout(), func(ctx context.Context) (result []byte, err error) {
		return p.storage.ReadAll(ctx, volume, path)
	})
}

func (p *xlStorageDiskIDCheck) ReadXL(ctx context.Context, volume string, path string, readData bool) (rf RawFileInfo, err error) {
	ctx, done, err := p.TrackDiskHealth(ctx, storageMetricReadXL, volume, path)
	if err != nil {

	dec := NewDecoder(StdEncoding, strings.NewReader(encoded))
	res1, err := io.ReadAll(dec)
	if err != nil {
		t.Errorf("ReadAll failed: %v", err)
	}

	dec = NewDecoder(StdEncoding, strings.NewReader(encodedShort))
	var res2 []byte
	res2, err = io.ReadAll(dec)
	if err != nil {
		t.Errorf("ReadAll failed: %v", err)
	}

	if !bytes.Equal(res1, res2) {
		t.Error("Decoded results not equal")