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Merge pull request #2904 from nspcc-dev/export-deserialization-context

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vm: export deserialization context
This commit is contained in:
Roman Khimov 2023-02-08 13:04:56 +03:00 committed by GitHub
commit 1d6e48ee78
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 43 additions and 2 deletions
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25
pkg/vm/stackitem/serialization.go
View file

@ -232,6 +232,27 @@ func Deserialize(data []byte) (Item, error) {
return item, nil
}
// DeserializeLimited returns Item deserialized from the given byte slice. limit
// restricts the maximum number of items deserialized item can contain (including
// itself). The default limit of MaxDeserialized is used if non-positive limit is
// specified.
func DeserializeLimited(data []byte, limit int) (Item, error) {
r := io.NewBinReaderFromBuf(data)
dc := deserContext{
BinReader: r,
allowInvalid: false,
limit: MaxDeserialized,
}
if limit > 0 {
dc.limit = limit
}
item := dc.decodeBinary()
if r.Err != nil {
return nil, r.Err
}
return item, nil
}
// DecodeBinary decodes the previously serialized Item from the given
// reader. It's similar to the io.Serializable's DecodeBinary() but implemented
// as a function because Item itself is an interface. Caveat: always check
@ -283,7 +304,7 @@ func (r *deserContext) decodeBinary() Item {
return NewBigInteger(num)
case ArrayT, StructT:
size := int(r.ReadVarUint())
if size > MaxDeserialized {
if size > r.limit {
r.Err = errTooBigElements
return nil
}
@ -298,7 +319,7 @@ func (r *deserContext) decodeBinary() Item {
return NewStruct(arr)
case MapT:
size := int(r.ReadVarUint())
if size > MaxDeserialized {
if size > r.limit/2 {
r.Err = errTooBigElements
return nil
}

20
pkg/vm/stackitem/serialization_test.go
View file

@ -209,6 +209,26 @@ func TestDeserializeTooManyElements(t *testing.T) {
require.True(t, errors.Is(err, ErrTooBig), err)
}
func TestDeserializeLimited(t *testing.T) {
customLimit := MaxDeserialized + 1
item := Make(0)
for i := 0; i < customLimit-1; i++ { // 1 for zero inner element.
item = Make([]Item{item})
}
data, err := Serialize(item)
require.NoError(t, err)
actual, err := DeserializeLimited(data, customLimit)
require.NoError(t, err)
require.Equal(t, item, actual)
item = Make([]Item{item})
data, err = Serialize(item)
require.NoError(t, err)
_, err = DeserializeLimited(data, customLimit)
require.Error(t, err)
require.True(t, errors.Is(err, ErrTooBig), err)
}
func BenchmarkEncodeBinary(b *testing.B) {
arr := getBigArray(15)