data[i] = byte(rng.Int63() & 3)
	}
	failOnErr := func(err error) {
		if err != nil {
			logger.Fatal(errSelfTestFailure, "compress: error on self-test: %v", err)
		}
	}
	const skip = 2<<20 + 511
	r, _ := newS2CompressReader(bytes.NewBuffer(data), int64(len(data)), true)
	b, err := io.ReadAll(r)
	failOnErr(err)
	failOnErr(r.Close())
	// Decompression reader.