/* Copyright 2017 - 2022 R. Thomas
 * Copyright 2017 - 2022 Quarkslab
 *
 * 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
 *
 *     http://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.
 */
#ifndef LIEF_MACHO_DYLD_EXPORTS_TRIE_H
#define LIEF_MACHO_DYLD_EXPORTS_TRIE_H
#include <memory>
#include "LIEF/span.hpp"
#include "LIEF/iterators.hpp"
#include "LIEF/visibility.h"
#include "LIEF/MachO/LoadCommand.hpp"

namespace LIEF {
namespace MachO {

class BinaryParser;
class Builder;
class LinkEdit;
class ExportInfo;
class Binary;

namespace details {
struct linkedit_data_command;
}

//! Class that represents the LC_DYLD_EXPORTS_TRIE command
//!
//! In recent Mach-O binaries, this command replace the DyldInfo export trie buffer
class LIEF_API DyldExportsTrie : public LoadCommand {
  friend class BinaryParser;
  friend class Builder;
  friend class LinkEdit;
  friend class Binary;

  public:
  //! Internal container for storing ExportInfo
  using export_info_t = std::vector<std::unique_ptr<ExportInfo>>;

  //! Iterator which outputs const ExportInfo&
  using it_export_info = ref_iterator<export_info_t&, ExportInfo*>;

  //! Iterator which outputs const ExportInfo&
  using it_const_export_info = const_ref_iterator<const export_info_t&, ExportInfo*>;

  DyldExportsTrie();
  DyldExportsTrie(const details::linkedit_data_command& cmd);
  DyldExportsTrie* clone() const override;

  void swap(DyldExportsTrie& other);

  ~DyldExportsTrie() override;

  //! Offset of the LC_DYLD_EXPORTS_TRIE.
  //! This offset should point in the __LINKEDIT segment
  uint32_t data_offset() const;

  //! Size of the LC_DYLD_EXPORTS_TRIE payload.
  uint32_t data_size() const;

  void data_offset(uint32_t offset);
  void data_size(uint32_t size);

  inline span<const uint8_t> content() const {
    return content_;
  }

  //! Iterator over the ExportInfo entries
  it_export_info       exports();
  it_const_export_info exports() const;

  //! Print the exports trie in a humman-readable way
  std::string show_export_trie() const;

  //! Add an entrie in the current trie.
  //! See also: LIEF::MachO::Binary::add_exported_function
  void add(std::unique_ptr<ExportInfo> info);

  bool operator==(const DyldExportsTrie& rhs) const;
  bool operator!=(const DyldExportsTrie& rhs) const;

  void accept(Visitor& visitor) const override;

  std::ostream& print(std::ostream& os) const override;

  static bool classof(const LoadCommand* cmd);

  private:
  DyldExportsTrie& operator=(DyldExportsTrie other);
  DyldExportsTrie(const DyldExportsTrie& other);

  uint32_t data_offset_ = 0;
  uint32_t data_size_   = 0;

  // Raw payload of the DyldChainedFixups.
  // This payload is located in the __LINKEDIT segment
  span<uint8_t> content_;

  export_info_t  export_info_;
};

}
}
#endif