// Copyright 2025 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "internal/empty_descriptors.h"

#include <cstdint>

#include "google/protobuf/descriptor.pb.h"

#include "absl/base/attributes.h"

#include "absl/base/macros.h"

#include "absl/base/no_destructor.h"

#include "absl/base/nullability.h"

#include "absl/log/absl_check.h"

#include "absl/log/die_if_null.h"

#include "google/protobuf/descriptor.h"

#include "google/protobuf/dynamic_message.h"

#include "google/protobuf/message.h"

namespace cel::internal {

namespace {

ABSL_CONST_INIT const uint8_t kEmptyDescriptorSet[] = {

#include "internal/empty_descriptor_set_embed.inc"

};

const google::protobuf::DescriptorPool* absl_nonnull GetEmptyDescriptorPool() {

static const google::protobuf::DescriptorPool* absl_nonnull const pool = []() {

google::protobuf::FileDescriptorSet file_desc_set;

ABSL_CHECK(file_desc_set.ParseFromArray( // Crash OK

kEmptyDescriptorSet, ABSL_ARRAYSIZE(kEmptyDescriptorSet)));

auto* pool = new google::protobuf::DescriptorPool();

for (const auto& file_desc : file_desc_set.file()) {

ABSL_CHECK(pool->BuildFile(file_desc) != nullptr); // Crash OK

}

return pool;

}();

return pool;

}

google::protobuf::MessageFactory* absl_nonnull GetEmptyMessageFactory() {

static absl::NoDestructor<google::protobuf::DynamicMessageFactory> factory;

return &*factory;

}

} // namespace

const google::protobuf::Message* absl_nonnull GetEmptyDefaultInstance() {

static const google::protobuf::Message* absl_nonnull const instance = []() {

return ABSL_DIE_IF_NULL( // Crash OK

ABSL_DIE_IF_NULL( // Crash OK

GetEmptyMessageFactory()->GetPrototype(

ABSL_DIE_IF_NULL( // Crash OK

GetEmptyDescriptorPool()->FindMessageTypeByName(

"google.protobuf.Empty")))))

->New();

}();

return instance;

}

} // namespace cel::internal