forked from cerc-io/plugeth
rlp: remove support for signed integer types
There is no agreement on how to encode negative integers across implementations. cpp-ethereum doesn't support them either.
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4f12f0697e
commit
93e858f88e
@ -54,7 +54,7 @@ type Decoder interface {
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// To decode into a Go string, the input must be an RLP string. The
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// bytes are taken as-is and will not necessarily be valid UTF-8.
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//
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// To decode into an integer type, the input must also be an RLP
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// To decode into an unsigned integer type, the input must also be an RLP
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// string. The bytes are interpreted as a big endian representation of
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// the integer. If the RLP string is larger than the bit size of the
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// type, Decode will return an error. Decode also supports *big.Int.
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@ -66,8 +66,9 @@ type Decoder interface {
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// []interface{}, for RLP lists
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// []byte, for RLP strings
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//
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// Non-empty interface types are not supported, nor are bool, float32,
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// float64, maps, channel types and functions.
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// Non-empty interface types are not supported, nor are booleans,
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// signed integers, floating point numbers, maps, channels and
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// functions.
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func Decode(r io.Reader, val interface{}) error {
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return NewStream(r).Decode(val)
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}
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@ -97,8 +98,8 @@ func makeDecoder(typ reflect.Type) (dec decoder, err error) {
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return decodeBigInt, nil
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case typ.AssignableTo(bigInt):
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return decodeBigIntNoPtr, nil
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case isInteger(kind):
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return makeNumDecoder(typ), nil
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case isUint(kind):
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return decodeUint, nil
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case kind == reflect.String:
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return decodeString, nil
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case kind == reflect.Slice || kind == reflect.Array:
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@ -114,30 +115,6 @@ func makeDecoder(typ reflect.Type) (dec decoder, err error) {
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}
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}
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func makeNumDecoder(typ reflect.Type) decoder {
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kind := typ.Kind()
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switch {
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case kind <= reflect.Int64:
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return decodeInt
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case kind <= reflect.Uint64:
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return decodeUint
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default:
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panic("fallthrough")
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}
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}
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func decodeInt(s *Stream, val reflect.Value) error {
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typ := val.Type()
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num, err := s.uint(typ.Bits())
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if err == errUintOverflow {
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return decodeError{"input string too long", typ}
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} else if err != nil {
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return err
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}
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val.SetInt(int64(num))
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return nil
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}
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func decodeUint(s *Stream, val reflect.Value) error {
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typ := val.Type()
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num, err := s.uint(typ.Bits())
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@ -171,7 +171,7 @@ func TestDecodeErrors(t *testing.T) {
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t.Errorf("Decode(r, new(chan bool)) error mismatch, got %q, want %q", err, expectErr)
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}
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if err := Decode(r, new(int)); err != io.EOF {
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if err := Decode(r, new(uint)); err != io.EOF {
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t.Errorf("Decode(r, new(int)) error mismatch, got %q, want %q", err, io.EOF)
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}
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}
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@ -184,12 +184,12 @@ type decodeTest struct {
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}
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type simplestruct struct {
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A int
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A uint
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B string
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}
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type recstruct struct {
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I int
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I uint
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Child *recstruct
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}
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@ -202,7 +202,7 @@ var (
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var (
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sharedByteArray [5]byte
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sharedPtr = new(*int)
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sharedPtr = new(*uint)
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)
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var decodeTests = []decodeTest{
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@ -217,13 +217,13 @@ var decodeTests = []decodeTest{
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{input: "C0", ptr: new(uint32), error: ErrExpectedString.Error()},
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// slices
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{input: "C0", ptr: new([]int), value: []int{}},
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{input: "C80102030405060708", ptr: new([]int), value: []int{1, 2, 3, 4, 5, 6, 7, 8}},
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{input: "C0", ptr: new([]uint), value: []uint{}},
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{input: "C80102030405060708", ptr: new([]uint), value: []uint{1, 2, 3, 4, 5, 6, 7, 8}},
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// arrays
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{input: "C0", ptr: new([5]int), value: [5]int{}},
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{input: "C50102030405", ptr: new([5]int), value: [5]int{1, 2, 3, 4, 5}},
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{input: "C6010203040506", ptr: new([5]int), error: "rlp: input list has too many elements for [5]int"},
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{input: "C0", ptr: new([5]uint), value: [5]uint{}},
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{input: "C50102030405", ptr: new([5]uint), value: [5]uint{1, 2, 3, 4, 5}},
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{input: "C6010203040506", ptr: new([5]uint), error: "rlp: input list has too many elements for [5]uint"},
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// byte slices
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{input: "01", ptr: new([]byte), value: []byte{1}},
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@ -280,17 +280,17 @@ var decodeTests = []decodeTest{
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},
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// pointers
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{input: "00", ptr: new(*int), value: (*int)(nil)},
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{input: "80", ptr: new(*int), value: (*int)(nil)},
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{input: "C0", ptr: new(*int), value: (*int)(nil)},
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{input: "07", ptr: new(*int), value: intp(7)},
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{input: "8108", ptr: new(*int), value: intp(8)},
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{input: "C109", ptr: new(*[]int), value: &[]int{9}},
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{input: "00", ptr: new(*uint), value: (*uint)(nil)},
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{input: "80", ptr: new(*uint), value: (*uint)(nil)},
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{input: "C0", ptr: new(*uint), value: (*uint)(nil)},
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{input: "07", ptr: new(*uint), value: uintp(7)},
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{input: "8108", ptr: new(*uint), value: uintp(8)},
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{input: "C109", ptr: new(*[]uint), value: &[]uint{9}},
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{input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}},
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// pointer should be reset to nil
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{input: "05", ptr: sharedPtr, value: intp(5)},
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{input: "80", ptr: sharedPtr, value: (*int)(nil)},
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{input: "05", ptr: sharedPtr, value: uintp(5)},
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{input: "80", ptr: sharedPtr, value: (*uint)(nil)},
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// interface{}
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{input: "00", ptr: new(interface{}), value: []byte{0}},
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@ -301,7 +301,7 @@ var decodeTests = []decodeTest{
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{input: "C50183040404", ptr: new(interface{}), value: []interface{}{[]byte{1}, []byte{4, 4, 4}}},
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}
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func intp(i int) *int { return &i }
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func uintp(i uint) *uint { return &i }
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func runTests(t *testing.T, decode func([]byte, interface{}) error) {
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for i, test := range decodeTests {
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@ -434,8 +434,8 @@ func ExampleDecode() {
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input, _ := hex.DecodeString("C90A1486666F6F626172")
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type example struct {
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A, B int
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private int // private fields are ignored
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A, B uint
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private uint // private fields are ignored
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String string
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}
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@ -447,7 +447,7 @@ func ExampleDecode() {
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fmt.Printf("Decoded value: %#v\n", s)
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}
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// Output:
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// Decoded value: rlp.example{A:10, B:20, private:0, String:"foobar"}
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// Decoded value: rlp.example{A:0xa, B:0x14, private:0x0, String:"foobar"}
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}
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func ExampleStream() {
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@ -57,6 +57,6 @@ func genTypeInfo(typ reflect.Type) (info *typeinfo, err error) {
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return info, nil
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}
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func isInteger(k reflect.Kind) bool {
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return k >= reflect.Int && k <= reflect.Uintptr
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func isUint(k reflect.Kind) bool {
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return k >= reflect.Uint && k <= reflect.Uintptr
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}
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