hpb/hpb.h

// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd

#ifndef GOOGLE_PROTOBUF_HPB_HPB_H__
#define GOOGLE_PROTOBUF_HPB_HPB_H__

#include <type_traits>

#include "absl/base/attributes.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "hpb/arena.h"
#include "hpb/extension.h"
#include "hpb/internal/template_help.h"
#include "hpb/multibackend.h"
#include "hpb/ptr.h"
#include "hpb/status.h"

#if HPB_INTERNAL_BACKEND == HPB_INTERNAL_BACKEND_UPB
#include "hpb/backend/upb/interop.h"
#include "hpb/backend/upb/upb.h"
#include "upb/wire/decode.h"
#elif HPB_INTERNAL_BACKEND == HPB_INTERNAL_BACKEND_CPP
#include "hpb/backend/cpp/cpp.h"
#else
#error hpb backend unknown
#endif

namespace hpb {

template <typename T>
typename T::Proxy CreateMessage(Arena& arena) {
  return backend::CreateMessage<T>(arena);
}

template <typename T>
typename T::Proxy CloneMessage(Ptr<T> message, Arena& arena) {
  return backend::CloneMessage<T>(message, arena);
}

template <typename T>
void DeepCopy(Ptr<const T> source_message, Ptr<T> target_message) {
  static_assert(!std::is_const_v<T>);
  backend::DeepCopy(source_message, target_message);
}

template <typename T>
void DeepCopy(Ptr<const T> source_message, T* target_message) {
  static_assert(!std::is_const_v<T>);
  DeepCopy(source_message, Ptr(target_message));
}

template <typename T>
void DeepCopy(const T* source_message, T* target_message) {
  static_assert(!std::is_const_v<T>);
  DeepCopy(Ptr(source_message), Ptr(target_message));
}

template <typename T>
void ClearMessage(internal::PtrOrRawMutable<T> message) {
  backend::ClearMessage(message);
}

template <typename T>
ABSL_MUST_USE_RESULT bool Parse(internal::PtrOrRaw<T> message,
                                absl::string_view bytes,
                                const ExtensionRegistry& extension_registry =
                                    ExtensionRegistry::EmptyRegistry()) {
  static_assert(!std::is_const_v<T>);
  upb_Message_Clear(interop::upb::GetMessage(message),
                    interop::upb::GetMiniTable(message));
  auto* arena = interop::upb::GetArena(message);
  return upb_Decode(bytes.data(), bytes.size(),
                    interop::upb::GetMessage(message),
                    interop::upb::GetMiniTable(message),
                    internal::GetUpbExtensions(extension_registry),
                    /* options= */ 0, arena) == kUpb_DecodeStatus_Ok;
}

template <typename T>
absl::StatusOr<T> Parse(absl::string_view bytes,
                        const ExtensionRegistry& extension_registry =
                            ExtensionRegistry::EmptyRegistry()) {
  T message;
  auto* arena = interop::upb::GetArena(&message);
  upb_DecodeStatus status =
      upb_Decode(bytes.data(), bytes.size(), interop::upb::GetMessage(&message),
                 interop::upb::GetMiniTable(&message),
                 internal::GetUpbExtensions(extension_registry),
                 /* options= */ 0, arena);
  if (status == kUpb_DecodeStatus_Ok) {
    return message;
  }
  return MessageDecodeError(status);
}

template <typename T>
absl::StatusOr<absl::string_view> Serialize(internal::PtrOrRaw<T> message,
                                            Arena& arena) {
  return backend::Serialize(message, arena);
}

}  // namespace hpb

#endif  // GOOGLE_PROTOBUF_HPB_HPB_H__