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rlp: fix encoding of one element strings and byte slices

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The encoder was missing a special case for one element strings whose
element is below 0x7f. Such strings must be encoded as a single byte
without a string header.
This commit is contained in:
Felix Lange 2015-03-19 12:15:43 +01:00
parent 064279c0ec
commit 965c9babe3
2 changed files with 20 additions and 7 deletions
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21
rlp/encode.go
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@ -203,8 +203,13 @@ func (w *encbuf) encodeStringHeader(size int) {
}
func (w *encbuf) encodeString(b []byte) {
w.encodeStringHeader(len(b))
w.str = append(w.str, b...)
if len(b) == 1 && b[0] <= 0x7F {
// fits single byte, no string header
w.str = append(w.str, b[0])
} else {
w.encodeStringHeader(len(b))
w.str = append(w.str, b...)
}
}
func (w *encbuf) list() *listhead {
@ -404,9 +409,6 @@ func writeBigInt(i *big.Int, w *encbuf) error {
return fmt.Errorf("rlp: cannot encode negative *big.Int")
} else if cmp == 0 {
w.str = append(w.str, 0x80)
} else if bits := i.BitLen(); bits < 8 {
// fits single byte
w.str = append(w.str, byte(i.Uint64()))
} else {
w.encodeString(i.Bytes())
}
@ -434,8 +436,13 @@ func writeByteArray(val reflect.Value, w *encbuf) error {
func writeString(val reflect.Value, w *encbuf) error {
s := val.String()
w.encodeStringHeader(len(s))
w.str = append(w.str, s...)
if len(s) == 1 && s[0] <= 0x7f {
// fits single byte, no string header
w.str = append(w.str, s[0])
} else {
w.encodeStringHeader(len(s))
w.str = append(w.str, s...)
}
return nil
}

6
rlp/encode_test.go
View File

@ -103,12 +103,18 @@ var encTests = []encTest{
// byte slices, strings
{val: []byte{}, output: "80"},
{val: []byte{0x7E}, output: "7E"},
{val: []byte{0x7F}, output: "7F"},
{val: []byte{0x80}, output: "8180"},
{val: []byte{1, 2, 3}, output: "83010203"},
{val: []namedByteType{1, 2, 3}, output: "83010203"},
{val: [...]namedByteType{1, 2, 3}, output: "83010203"},
{val: "", output: "80"},
{val: "\x7E", output: "7E"},
{val: "\x7F", output: "7F"},
{val: "\x80", output: "8180"},
{val: "dog", output: "83646F67"},
{
val: "Lorem ipsum dolor sit amet, consectetur adipisicing eli",