Mutator breaks content of Any

[sievlev]

Library version: v1.1

Proto:

syntax = "proto2";

import "google/protobuf/any.proto";

message Hello {
  optional string field = 1;
  optional google.protobuf.Any content = 2;
}

message Content1 {
  optional string field = 1;
}

message Content2 {
  optional string field = 1;
}

Code:

#include <iostream>

#include "src/text_format.h"
#include "src/mutator.h"
#include "hello.pb.h"

int main() {
        Hello he;

        Content1 c1;
        c1.set_field("field1");
        auto a = new google::protobuf::Any();
        a->PackFrom(c1);
        he.set_allocated_content(a);

        std::cerr << "data:" << protobuf_mutator::SaveMessageAsText(he) << std::endl;

        protobuf_mutator::Mutator mutator;
        mutator.Seed(1);

        mutator.Mutate(&he, 10000);
        mutator.Fix(&he);
        std::cerr << "data:" << protobuf_mutator::SaveMessageAsText(he) << std::endl;
}

Current result:

data:content {
  type_url: "type.googleapis.com/Content1"
  value: "\n\006field1"
}

data:content {
  type_url: "type.gogleapi.\303\225om/Content1"
  value: "\n\006field1"
}

Field 'type_url' is broken and application will not accept this message. It's also possible to get a broken (unparsable) field 'value'.