Merge pull request #203 from fjl/rlp-fixes
RLP: remove signed integer support and other fixes
This commit is contained in:
Jeffrey Wilcke
commit
ce0c4e5d86
193
rlp/decode.go
193
rlp/decode.go
@ -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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@ -81,37 +82,58 @@ func (err decodeError) Error() string {
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return fmt.Sprintf("rlp: %s for %v", err.msg, err.typ)
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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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func wrapStreamError(err error, typ reflect.Type) error {
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switch err {
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case ErrExpectedList:
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return decodeError{"expected input list", typ}
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case ErrExpectedString:
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return decodeError{"expected input string or byte", typ}
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case errUintOverflow:
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return decodeError{"input string too long", typ}
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case errNotAtEOL:
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return decodeError{"input list has too many elements", typ}
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}
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return err
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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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var (
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decoderInterface = reflect.TypeOf(new(Decoder)).Elem()
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bigInt = reflect.TypeOf(big.Int{})
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)
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func makeDecoder(typ reflect.Type) (dec decoder, err error) {
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kind := typ.Kind()
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switch {
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case typ.Implements(decoderInterface):
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return decodeDecoder, nil
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case kind != reflect.Ptr && reflect.PtrTo(typ).Implements(decoderInterface):
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return decodeDecoderNoPtr, nil
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case typ.AssignableTo(reflect.PtrTo(bigInt)):
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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 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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return makeListDecoder(typ)
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case kind == reflect.Struct:
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return makeStructDecoder(typ)
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case kind == reflect.Ptr:
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return makePtrDecoder(typ)
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case kind == reflect.Interface && typ.NumMethod() == 0:
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return decodeInterface, nil
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default:
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return nil, fmt.Errorf("rlp: type %v is not RLP-serializable", typ)
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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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if err == errUintOverflow {
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return decodeError{"input string too big", typ}
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} else if err != nil {
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return err
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if err != nil {
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return wrapStreamError(err, val.Type())
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}
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val.SetUint(num)
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return nil
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@ -120,7 +142,7 @@ func decodeUint(s *Stream, val reflect.Value) error {
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func decodeString(s *Stream, val reflect.Value) error {
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b, err := s.Bytes()
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if err != nil {
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return err
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return wrapStreamError(err, val.Type())
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}
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val.SetString(string(b))
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return nil
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@ -133,7 +155,7 @@ func decodeBigIntNoPtr(s *Stream, val reflect.Value) error {
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func decodeBigInt(s *Stream, val reflect.Value) error {
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b, err := s.Bytes()
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if err != nil {
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return err
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return wrapStreamError(err, val.Type())
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}
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i := val.Interface().(*big.Int)
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if i == nil {
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@ -144,8 +166,6 @@ func decodeBigInt(s *Stream, val reflect.Value) error {
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return nil
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}
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const maxInt = int(^uint(0) >> 1)
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func makeListDecoder(typ reflect.Type) (decoder, error) {
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etype := typ.Elem()
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if etype.Kind() == reflect.Uint8 && !reflect.PtrTo(etype).Implements(decoderInterface) {
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@ -159,55 +179,41 @@ func makeListDecoder(typ reflect.Type) (decoder, error) {
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if err != nil {
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return nil, err
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}
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var maxLen = maxInt
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if typ.Kind() == reflect.Array {
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maxLen = typ.Len()
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return func(s *Stream, val reflect.Value) error {
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return decodeListArray(s, val, etypeinfo.decoder)
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}, nil
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}
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dec := func(s *Stream, val reflect.Value) error {
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return decodeList(s, val, etypeinfo.decoder, maxLen)
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}
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return dec, nil
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return func(s *Stream, val reflect.Value) error {
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return decodeListSlice(s, val, etypeinfo.decoder)
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}, nil
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}
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// decodeList decodes RLP list elements into slices and arrays.
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//
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// The approach here is stolen from package json, although we differ
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// in the semantics for arrays. package json discards remaining
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// elements that would not fit into the array. We generate an error in
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// this case because we'd be losing information.
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func decodeList(s *Stream, val reflect.Value, elemdec decoder, maxelem int) error {
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func decodeListSlice(s *Stream, val reflect.Value, elemdec decoder) error {
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size, err := s.List()
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if err != nil {
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return err
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return wrapStreamError(err, val.Type())
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}
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if size == 0 {
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if val.Kind() == reflect.Slice {
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val.Set(reflect.MakeSlice(val.Type(), 0, 0))
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} else {
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zero(val, 0)
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}
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val.Set(reflect.MakeSlice(val.Type(), 0, 0))
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return s.ListEnd()
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}
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i := 0
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for {
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if i > maxelem {
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return decodeError{"input list has too many elements", val.Type()}
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for ; ; i++ {
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// grow slice if necessary
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if i >= val.Cap() {
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newcap := val.Cap() + val.Cap()/2
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if newcap < 4 {
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newcap = 4
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}
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newv := reflect.MakeSlice(val.Type(), val.Len(), newcap)
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reflect.Copy(newv, val)
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val.Set(newv)
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}
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if val.Kind() == reflect.Slice {
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// grow slice if necessary
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if i >= val.Cap() {
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newcap := val.Cap() + val.Cap()/2
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if newcap < 4 {
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newcap = 4
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}
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newv := reflect.MakeSlice(val.Type(), val.Len(), newcap)
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reflect.Copy(newv, val)
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val.Set(newv)
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}
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if i >= val.Len() {
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val.SetLen(i + 1)
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}
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if i >= val.Len() {
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val.SetLen(i + 1)
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}
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// decode into element
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if err := elemdec(s, val.Index(i)); err == EOL {
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@ -215,26 +221,49 @@ func decodeList(s *Stream, val reflect.Value, elemdec decoder, maxelem int) erro
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} else if err != nil {
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return err
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}
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i++
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}
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if i < val.Len() {
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if val.Kind() == reflect.Array {
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// zero the rest of the array.
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zero(val, i)
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} else {
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val.SetLen(i)
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}
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val.SetLen(i)
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}
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return s.ListEnd()
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}
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func decodeListArray(s *Stream, val reflect.Value, elemdec decoder) error {
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size, err := s.List()
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if err != nil {
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return err
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}
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if size == 0 {
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zero(val, 0)
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return s.ListEnd()
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}
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// The approach here is stolen from package json, although we differ
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// in the semantics for arrays. package json discards remaining
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// elements that would not fit into the array. We generate an error in
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// this case because we'd be losing information.
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vlen := val.Len()
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i := 0
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for ; i < vlen; i++ {
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if err := elemdec(s, val.Index(i)); err == EOL {
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break
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} else if err != nil {
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return err
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}
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}
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if i < vlen {
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zero(val, i)
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}
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return wrapStreamError(s.ListEnd(), val.Type())
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}
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func decodeByteSlice(s *Stream, val reflect.Value) error {
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kind, _, err := s.Kind()
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if err != nil {
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return err
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}
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if kind == List {
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return decodeList(s, val, decodeUint, maxInt)
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return decodeListSlice(s, val, decodeUint)
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}
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b, err := s.Bytes()
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if err == nil {
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@ -251,14 +280,14 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
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switch kind {
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case Byte:
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if val.Len() == 0 {
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return decodeError{"input string too big", val.Type()}
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return decodeError{"input string too long", val.Type()}
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}
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bv, _ := s.Uint()
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val.Index(0).SetUint(bv)
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zero(val, 1)
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case String:
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if uint64(val.Len()) < size {
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return decodeError{"input string too big", val.Type()}
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return decodeError{"input string too long", val.Type()}
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}
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slice := val.Slice(0, int(size)).Interface().([]byte)
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if err := s.readFull(slice); err != nil {
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@ -266,14 +295,15 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
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}
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zero(val, int(size))
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case List:
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return decodeList(s, val, decodeUint, val.Len())
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return decodeListArray(s, val, decodeUint)
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}
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return nil
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}
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func zero(val reflect.Value, start int) {
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z := reflect.Zero(val.Type().Elem())
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for i := start; i < val.Len(); i++ {
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end := val.Len()
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for i := start; i < end; i++ {
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val.Index(i).Set(z)
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}
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}
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@ -296,7 +326,7 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
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}
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dec := func(s *Stream, val reflect.Value) (err error) {
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if _, err = s.List(); err != nil {
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return err
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return wrapStreamError(err, typ)
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}
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for _, f := range fields {
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err = f.info.decoder(s, val.Field(f.index))
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@ -307,10 +337,7 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
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return err
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}
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}
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if err = s.ListEnd(); err == errNotAtEOL {
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err = decodeError{"input list has too many elements", typ}
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}
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return err
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return wrapStreamError(s.ListEnd(), typ)
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}
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return dec, nil
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}
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@ -348,7 +375,7 @@ func decodeInterface(s *Stream, val reflect.Value) error {
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}
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if kind == List {
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slice := reflect.New(ifsliceType).Elem()
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if err := decodeList(s, slice, decodeInterface, maxInt); err != nil {
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if err := decodeListSlice(s, slice, decodeInterface); err != nil {
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return err
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}
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val.Set(slice)
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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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@ -213,17 +213,17 @@ var decodeTests = []decodeTest{
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{input: "820505", ptr: new(uint32), value: uint32(0x0505)},
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{input: "83050505", ptr: new(uint32), value: uint32(0x050505)},
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{input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)},
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{input: "850505050505", ptr: new(uint32), error: "rlp: input string too big for uint32"},
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{input: "C0", ptr: new(uint32), error: ErrExpectedString.Error()},
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{input: "850505050505", ptr: new(uint32), error: "rlp: input string too long for uint32"},
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{input: "C0", ptr: new(uint32), error: "rlp: expected input string or byte for uint32"},
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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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@ -231,7 +231,7 @@ var decodeTests = []decodeTest{
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{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
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{input: "C0", ptr: new([]byte), value: []byte{}},
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{input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}},
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{input: "C3820102", ptr: new([]byte), error: "rlp: input string too big for uint8"},
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{input: "C3820102", ptr: new([]byte), error: "rlp: input string too long for uint8"},
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// byte arrays
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{input: "01", ptr: new([5]byte), value: [5]byte{1}},
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@ -239,8 +239,8 @@ var decodeTests = []decodeTest{
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{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
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{input: "C0", ptr: new([5]byte), value: [5]byte{}},
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{input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}},
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{input: "C3820102", ptr: new([5]byte), error: "rlp: input string too big for uint8"},
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{input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too big for [5]uint8"},
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{input: "C3820102", ptr: new([5]byte), error: "rlp: input string too long for uint8"},
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{input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too long for [5]uint8"},
|
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{input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF.Error()},
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// byte array reuse (should be zeroed)
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@ -254,19 +254,19 @@ var decodeTests = []decodeTest{
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// zero sized byte arrays
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{input: "80", ptr: new([0]byte), value: [0]byte{}},
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{input: "C0", ptr: new([0]byte), value: [0]byte{}},
|
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{input: "01", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
|
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{input: "8101", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
|
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{input: "01", ptr: new([0]byte), error: "rlp: input string too long for [0]uint8"},
|
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{input: "8101", ptr: new([0]byte), error: "rlp: input string too long for [0]uint8"},
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// strings
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{input: "00", ptr: new(string), value: "\000"},
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{input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"},
|
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{input: "C0", ptr: new(string), error: ErrExpectedString.Error()},
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{input: "C0", ptr: new(string), error: "rlp: expected input string or byte for string"},
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// big ints
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{input: "01", ptr: new(*big.Int), value: big.NewInt(1)},
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{input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt},
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{input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works
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{input: "C0", ptr: new(*big.Int), error: ErrExpectedString.Error()},
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||||
{input: "C0", ptr: new(*big.Int), error: "rlp: expected input string or byte for *big.Int"},
|
||||
|
||||
// structs
|
||||
{input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}},
|
||||
@ -280,17 +280,17 @@ var decodeTests = []decodeTest{
|
||||
},
|
||||
|
||||
// pointers
|
||||
{input: "00", ptr: new(*int), value: (*int)(nil)},
|
||||
{input: "80", ptr: new(*int), value: (*int)(nil)},
|
||||
{input: "C0", ptr: new(*int), value: (*int)(nil)},
|
||||
{input: "07", ptr: new(*int), value: intp(7)},
|
||||
{input: "8108", ptr: new(*int), value: intp(8)},
|
||||
{input: "C109", ptr: new(*[]int), value: &[]int{9}},
|
||||
{input: "00", ptr: new(*uint), value: (*uint)(nil)},
|
||||
{input: "80", ptr: new(*uint), value: (*uint)(nil)},
|
||||
{input: "C0", ptr: new(*uint), value: (*uint)(nil)},
|
||||
{input: "07", ptr: new(*uint), value: uintp(7)},
|
||||
{input: "8108", ptr: new(*uint), value: uintp(8)},
|
||||
{input: "C109", ptr: new(*[]uint), value: &[]uint{9}},
|
||||
{input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}},
|
||||
|
||||
// pointer should be reset to nil
|
||||
{input: "05", ptr: sharedPtr, value: intp(5)},
|
||||
{input: "80", ptr: sharedPtr, value: (*int)(nil)},
|
||||
{input: "05", ptr: sharedPtr, value: uintp(5)},
|
||||
{input: "80", ptr: sharedPtr, value: (*uint)(nil)},
|
||||
|
||||
// interface{}
|
||||
{input: "00", ptr: new(interface{}), value: []byte{0}},
|
||||
@ -301,7 +301,7 @@ var decodeTests = []decodeTest{
|
||||
{input: "C50183040404", ptr: new(interface{}), value: []interface{}{[]byte{1}, []byte{4, 4, 4}}},
|
||||
}
|
||||
|
||||
func intp(i int) *int { return &i }
|
||||
func uintp(i uint) *uint { return &i }
|
||||
|
||||
func runTests(t *testing.T, decode func([]byte, interface{}) error) {
|
||||
for i, test := range decodeTests {
|
||||
@ -434,8 +434,8 @@ func ExampleDecode() {
|
||||
input, _ := hex.DecodeString("C90A1486666F6F626172")
|
||||
|
||||
type example struct {
|
||||
A, B int
|
||||
private int // private fields are ignored
|
||||
A, B uint
|
||||
private uint // private fields are ignored
|
||||
String string
|
||||
}
|
||||
|
||||
@ -447,7 +447,7 @@ func ExampleDecode() {
|
||||
fmt.Printf("Decoded value: %#v\n", s)
|
||||
}
|
||||
// Output:
|
||||
// Decoded value: rlp.example{A:10, B:20, private:0, String:"foobar"}
|
||||
// Decoded value: rlp.example{A:0xa, B:0x14, private:0x0, String:"foobar"}
|
||||
}
|
||||
|
||||
func ExampleStream() {
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
package rlp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"math/big"
|
||||
"reflect"
|
||||
"sync"
|
||||
)
|
||||
@ -51,41 +49,14 @@ func cachedTypeInfo1(typ reflect.Type) (*typeinfo, error) {
|
||||
return typeCache[typ], err
|
||||
}
|
||||
|
||||
var (
|
||||
decoderInterface = reflect.TypeOf(new(Decoder)).Elem()
|
||||
bigInt = reflect.TypeOf(big.Int{})
|
||||
)
|
||||
|
||||
func genTypeInfo(typ reflect.Type) (info *typeinfo, err error) {
|
||||
info = new(typeinfo)
|
||||
kind := typ.Kind()
|
||||
switch {
|
||||
case typ.Implements(decoderInterface):
|
||||
info.decoder = decodeDecoder
|
||||
case kind != reflect.Ptr && reflect.PtrTo(typ).Implements(decoderInterface):
|
||||
info.decoder = decodeDecoderNoPtr
|
||||
case typ.AssignableTo(reflect.PtrTo(bigInt)):
|
||||
info.decoder = decodeBigInt
|
||||
case typ.AssignableTo(bigInt):
|
||||
info.decoder = decodeBigIntNoPtr
|
||||
case isInteger(kind):
|
||||
info.decoder = makeNumDecoder(typ)
|
||||
case kind == reflect.String:
|
||||
info.decoder = decodeString
|
||||
case kind == reflect.Slice || kind == reflect.Array:
|
||||
info.decoder, err = makeListDecoder(typ)
|
||||
case kind == reflect.Struct:
|
||||
info.decoder, err = makeStructDecoder(typ)
|
||||
case kind == reflect.Ptr:
|
||||
info.decoder, err = makePtrDecoder(typ)
|
||||
case kind == reflect.Interface && typ.NumMethod() == 0:
|
||||
info.decoder = decodeInterface
|
||||
default:
|
||||
err = fmt.Errorf("rlp: type %v is not RLP-serializable", typ)
|
||||
if info.decoder, err = makeDecoder(typ); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return info, err
|
||||
return info, nil
|
||||
}
|
||||
|
||||
func isInteger(k reflect.Kind) bool {
|
||||
return k >= reflect.Int && k <= reflect.Uintptr
|
||||
func isUint(k reflect.Kind) bool {
|
||||
return k >= reflect.Uint && k <= reflect.Uintptr
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user