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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "mojo/public/cpp/base/proto_wrapper.h"
#include <limits>
#include "base/check_op.h"
#include "third_party/protobuf/src/google/protobuf/message_lite.h"
namespace mojo_base {
ProtoWrapper::ProtoWrapper() = default;
ProtoWrapper::ProtoWrapper(mojo::DefaultConstruct::Tag passkey) {}
ProtoWrapper::~ProtoWrapper() = default;
ProtoWrapper::ProtoWrapper(ProtoWrapper&& other) = default;
ProtoWrapper& ProtoWrapper::operator=(ProtoWrapper&& other) = default;
ProtoWrapper::ProtoWrapper(const google::protobuf::MessageLite& message) {
proto_name_ = message.GetTypeName();
CHECK(message.ByteSizeLong() <= std::numeric_limits<int>::max());
bytes_ = BigBuffer(message.ByteSizeLong());
CHECK(message.SerializeToArray(bytes_->data(), bytes_->size()));
}
ProtoWrapper::ProtoWrapper(base::span<const uint8_t> data,
std::string type_name,
base::PassKey<ProtoWrapperBytes> passkey) {
CHECK(!type_name.empty());
CHECK_GT(data.size(), 0u);
// Protobuf's unwrapping mechanisms take `int`.
CHECK_LT(data.size(), static_cast<size_t>(std::numeric_limits<int>::max()));
bytes_ = BigBuffer(data);
proto_name_ = type_name;
}
bool ProtoWrapper::DeserializeToMessage(
google::protobuf::MessageLite& message) const {
if (!bytes_.has_value()) {
return false;
}
// ProtoWrapper is either constructed from a message or from a mojom
// typemapping, so must have a typename.
if (message.GetTypeName() != proto_name_) {
return false;
}
// ParseFromArray can only take `int`.
if (bytes_->size() > std::numeric_limits<int>::max()) {
return false;
}
if (bytes_->storage_type() == BigBuffer::StorageType::kBytes) {
return message.ParseFromArray(bytes_->data(), bytes_->size());
} else {
// Make an in-process copy here as protobuf is not designed to
// safely parse data that might be changing underneath it.
auto as_span = base::span(bytes_->data(), bytes_->size());
const std::vector<uint8_t> copy(as_span.begin(), as_span.end());
return message.ParseFromArray(copy.data(), copy.size());
}
}
} // namespace mojo_base
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