AuxiliarySymbol.hpp

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/* Copyright 2017 - 2025 R. Thomas
 * Copyright 2017 - 2025 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_COFF_AUXILIARY_SYMBOL_H
#define LIEF_COFF_AUXILIARY_SYMBOL_H
 
#include <ostream>
#include <memory>
#include <vector>
 
#include "LIEF/visibility.h"
#include "LIEF/span.hpp"
 
namespace LIEF {
class BinaryStream;
 
namespace COFF {
class Symbol;

class LIEF_API AuxiliarySymbol {
  public:
  AuxiliarySymbol() = default;
  AuxiliarySymbol(std::vector<uint8_t> payload) :
    type_(TYPE::UNKNOWN),
    payload_(std::move(payload))
  {}
  AuxiliarySymbol(const AuxiliarySymbol&) = default;
  AuxiliarySymbol& operator=(const AuxiliarySymbol&) = default;
 
  AuxiliarySymbol(AuxiliarySymbol&&) = default;
  AuxiliarySymbol& operator=(AuxiliarySymbol&&) = default;
 
  LIEF_LOCAL static std::unique_ptr<AuxiliarySymbol>
    parse(Symbol& sym, std::vector<uint8_t> payload);
 
  virtual std::unique_ptr<AuxiliarySymbol> clone() const {
    return std::unique_ptr<AuxiliarySymbol>(new AuxiliarySymbol(*this));
  }

  enum class TYPE {
    UNKNOWN = 0,
    CLR_TOKEN,
    FUNC_DEF,
    BF_AND_EF,
    WEAK_EXTERNAL,
    FILE,
    SEC_DEF,
  };
 
  AuxiliarySymbol(TYPE ty) :
    type_(ty)
  {}
 
  static TYPE get_aux_type(const Symbol& sym);
 
  TYPE type() const {
    return type_;
  }

  span<const uint8_t> payload() const {
    return payload_;
  }
 
  span<uint8_t> payload() {
    return payload_;
  }
 
  virtual std::string to_string() const;
 
  virtual ~AuxiliarySymbol() = default;

  template<class T>
  const T* as() const {
    static_assert(std::is_base_of<AuxiliarySymbol, T>::value,
                  "Require AuxiliarySymbol inheritance");
    if (T::classof(this)) {
      return static_cast<const T*>(this);
    }
    return nullptr;
  }
 
  template<class T>
  T* as() {
    return const_cast<T*>(static_cast<const AuxiliarySymbol*>(this)->as<T>());
  }
 
  LIEF_API friend
    std::ostream& operator<<(std::ostream& os, const AuxiliarySymbol& aux)
  {
    os << aux.to_string();
    return os;
  }
 
  protected:
  TYPE type_ = TYPE::UNKNOWN;
  std::vector<uint8_t> payload_;
};
 
}
}
#endif