{8, "\x00G\x00o\x00G\x00o"},
			{4, "end\n"},
		},
	}}

	for _, v := range vectors {
		t.Run(path.Base(v.file), func(t *testing.T) {
			f, err := os.Open(v.file)
			if err != nil {
				t.Fatalf("Open() error: %v", err)
			}
			defer f.Close()

			tr := NewReader(f)
			for i, tc := range v.cases {
				hdr, err := tr.Next()
				if err != nil || hdr == nil {

			size:       4,
			actualSize: 4,
			md5hex:     "e2fc714c4727ee9395f324cd2e7f331f",
			err:        ioutil.ErrOverread,
		},
	}
	for i, testCase := range testCases {
		t.Run(fmt.Sprintf("case-%d", i+1), func(t *testing.T) {
			r, err := NewReader(context.Background(), testCase.src, testCase.size, testCase.md5hex, testCase.sha256hex, testCase.actualSize)
			if err != nil {