if err != nil {
					// Call the cleanup funcs
					for i := len(cFns) - 1; i >= 0; i-- {
						cFns[i]()
					}
					return nil, err
				}
				if decryptSkip > 0 {
					inputReader = xioutil.NewSkipReader(inputReader, decryptSkip)
				}
				oi.Size = decLength
			}
			// Decompression reader.
			var dopts []s2.ReaderOption
			if off > 0 || decOff > 0 {

		cumulativeSum := int64(0)
		for _, p := range oi.partLengths {
			readers = append(readers, NewDummyDataGen(p, cumulativeSum))
			cumulativeSum += p
		}

		refReader := io.LimitReader(ioutilx.NewSkipReader(io.MultiReader(readers...), off), length)
		if ok, msg := cmpReaders(refReader, rec.Body); !ok {
			t.Fatalf("(%s) Object: %s Case %d ByteRange: %s --> data mismatch! (msg: %s)", instanceType, oi.objectName, i+1, byteRange, msg)