if len(s) > len(b) && b[len(b)-1] == '/' {
		n := len(strings.TrimRight(s[:len(b)-1], "/"))
		b[n] = 0 // Replace trailing slash with NUL terminator
	}
}

// fitsInBase256 reports whether x can be encoded into n bytes using base-256
// encoding. Unlike octal encoding, base-256 encoding does not require that the
// string ends with a NUL character. Thus, all n bytes are available for output.
//

		{0, 9, true},
		{math.MinInt64, 9, true},
		{math.MaxInt64, 12, true},
		{0, 12, true},
		{math.MinInt64, 12, true},
	}

	for _, v := range vectors {
		ok := fitsInBase256(v.width, v.in)
		if ok != v.ok {
			t.Errorf("fitsInBase256(%d, %d): got %v, want %v", v.in, v.width, ok, v.ok)
		}
	}
}

func TestParseNumeric(t *testing.T) {
	vectors := []struct {
		in   string
		want int64
		ok   bool
	}{

			} else {
				paxHdrs[paxKey] = s
			}
		}
		if v, ok := h.PAXRecords[paxKey]; ok && v == s {
			paxHdrs[paxKey] = v
		}
	}
	verifyNumeric := func(n int64, size int, name, paxKey string) {
		if !fitsInBase256(size, n) {
			whyNoGNU = fmt.Sprintf("GNU cannot encode %s=%d", name, n)
			format.mustNotBe(FormatGNU)
		}
		if !fitsInOctal(size, n) {
			whyNoUSTAR = fmt.Sprintf("USTAR cannot encode %s=%d", name, n)