}
	_, err = NewReader(bytes.NewReader(b), size)
	if err != ErrFormat {
		t.Errorf("sigs: error=%v, want %v", err, ErrFormat)
	}

	// negative size
	_, err = NewReader(bytes.NewReader([]byte("foobar")), -1)
	if err == nil {
		t.Errorf("archive/zip.NewReader: expected error when negative size is passed")
	}
}

func messWith(fileName string, corrupter func(b []byte)) (r io.ReaderAt, size int64) {

			continue
		}
		hdrs = append(hdrs, hdr)

		// If a special flag, we should read nothing.
		cnt, _ := io.ReadFull(tr, []byte{0})
		if cnt > 0 && hdr.Typeflag != TypeReg {
			t.Errorf("ReadFull(...): got %d bytes, want 0 bytes", cnt)
		}
	}

	// File is crafted with 16 entries. The later 8 are identical to the first
	// 8 except that the size is set.
	if len(hdrs) != 16 {

	// any state.
	r := NewReader([]byte("0123456789"))
	var wg sync.WaitGroup
	for i := 0; i < 5; i++ {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			var buf [1]byte
			r.ReadAt(buf[:], int64(i))
		}(i)
	}
	wg.Wait()
}

func TestEmptyReaderConcurrent(t *testing.T) {
	// Test for the race detector, to verify a Read that doesn't yield any bytes