if ret64 != int64(int32(ret64)) {
		return 0, StructuralError{"integer too large"}
	}
	return int32(ret64), nil
}

var bigOne = big.NewInt(1)

// parseBigInt treats the given bytes as a big-endian, signed integer and returns
// the result.
func parseBigInt(bytes []byte) (*big.Int, error) {
	if err := checkInteger(bytes); err != nil {
		return nil, err
	}
	ret := new(big.Int)

	{[]byte{}, false, ""},
	{[]byte{0x00, 0x7f}, false, ""},
	{[]byte{0xff, 0xf0}, false, ""},
}

func TestParseBigInt(t *testing.T) {
	for i, test := range bigIntTests {
		ret, err := parseBigInt(test.in)
		if (err == nil) != test.ok {
			t.Errorf("#%d: Incorrect error result (did fail? %v, expected: %v)", i, err == nil, test.ok)
		}
		if test.ok {
			if ret.String() != test.base10 {