LoadCommand.hpp

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/* Copyright 2017 - 2026 R. Thomas
 * Copyright 2017 - 2026 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_LOAD_COMMAND_H
#define LIEF_MACHO_LOAD_COMMAND_H
 
#include <memory>
#include <vector>
 
#include "LIEF/Object.hpp"
#include "LIEF/compiler_attributes.hpp"
#include "LIEF/visibility.h"
#include "LIEF/span.hpp"
 
namespace LIEF {
namespace MachO {
class Builder;
class BinaryParser;
class Binary;
 
namespace details {
struct load_command;
}

class LIEF_API LoadCommand : public Object {
  friend class Builder;
  friend class BinaryParser;
  friend class Binary;
 
  public:
  using raw_t = std::vector<uint8_t>;
 
  enum class TYPE : uint64_t {
    UNKNOWN = 0,
    SEGMENT = 0x00000001u,
    SYMTAB = 0x00000002u,
    SYMSEG = 0x00000003u,
    THREAD = 0x00000004u,
    UNIXTHREAD = 0x00000005u,
    LOADFVMLIB = 0x00000006u,
    IDFVMLIB = 0x00000007u,
    IDENT = 0x00000008u,
    FVMFILE = 0x00000009u,
    PREPAGE = 0x0000000Au,
    DYSYMTAB = 0x0000000Bu,
    LOAD_DYLIB = 0x0000000Cu,
    ID_DYLIB = 0x0000000Du,
    LOAD_DYLINKER = 0x0000000Eu,
    ID_DYLINKER = 0x0000000Fu,
    PREBOUND_DYLIB = 0x00000010u,
    ROUTINES = 0x00000011u,
    SUB_FRAMEWORK = 0x00000012u,
    SUB_UMBRELLA = 0x00000013u,
    SUB_CLIENT = 0x00000014u,
    SUB_LIBRARY = 0x00000015u,
    TWOLEVEL_HINTS = 0x00000016u,
    PREBIND_CKSUM = 0x00000017u,
    LOAD_WEAK_DYLIB = 0x80000018u,
    SEGMENT_64 = 0x00000019u,
    ROUTINES_64 = 0x0000001Au,
    UUID = 0x0000001Bu,
    RPATH = 0x8000001Cu,
    CODE_SIGNATURE = 0x0000001Du,
    SEGMENT_SPLIT_INFO = 0x0000001Eu,
    REEXPORT_DYLIB = 0x8000001Fu,
    LAZY_LOAD_DYLIB = 0x00000020u,
    ENCRYPTION_INFO = 0x00000021u,
    DYLD_INFO = 0x00000022u,
    DYLD_INFO_ONLY = 0x80000022u,
    LOAD_UPWARD_DYLIB = 0x80000023u,
    VERSION_MIN_MACOSX = 0x00000024u,
    VERSION_MIN_IPHONEOS = 0x00000025u,
    FUNCTION_STARTS = 0x00000026u,
    DYLD_ENVIRONMENT = 0x00000027u,
    MAIN = 0x80000028u,
    DATA_IN_CODE = 0x00000029u,
    SOURCE_VERSION = 0x0000002Au,
    DYLIB_CODE_SIGN_DRS = 0x0000002Bu,
    ENCRYPTION_INFO_64 = 0x0000002Cu,
    LINKER_OPTION = 0x0000002Du,
    LINKER_OPTIMIZATION_HINT = 0x0000002Eu,
    VERSION_MIN_TVOS = 0x0000002Fu,
    VERSION_MIN_WATCHOS = 0x00000030u,
    NOTE = 0x00000031u,
    BUILD_VERSION = 0x00000032u,
    DYLD_EXPORTS_TRIE = 0x80000033u,
    DYLD_CHAINED_FIXUPS = 0x80000034u,
    FILESET_ENTRY = 0x80000035u,
    ATOM_INFO = 0x00000036u,
    FUNCTION_VARIANTS = 0x00000037u,
    FUNCTION_VARIANT_FIXUPS = 0x00000038u,
    TARGET_TRIPLE = 0x00000039u,
    LAZY_LOAD_DYLIB_INFO = 0x0000003Au,
 
    LIEF_UNKNOWN = 0xffee0001u,
  };
 
  public:
  LoadCommand() = default;
  LoadCommand(const details::load_command& command);
  LoadCommand(LoadCommand::TYPE type, uint32_t size) :
    command_(type),
    size_(size) {}
 
  LoadCommand& operator=(const LoadCommand& copy) = default;
  LoadCommand(const LoadCommand& copy) = default;
 
  void swap(LoadCommand& other) noexcept;
 
  virtual std::unique_ptr<LoadCommand> clone() const {
    return std::unique_ptr<LoadCommand>(new LoadCommand(*this));
  }
 
  ~LoadCommand() override = default;

  LoadCommand::TYPE command() const {
    return command_;
  }

  uint32_t size() const {
    return size_;
  }

  span<const uint8_t> data() const LIEF_LIFETIMEBOUND {
    return original_data_;
  }

  uint64_t command_offset() const {
    return command_offset_;
  }
 
  void data(raw_t data) {
    original_data_ = std::move(data);
  }
 
  void command(LoadCommand::TYPE command) {
    command_ = command;
  }
 
  void size(uint32_t size) {
    size_ = size;
  }
 
  void command_offset(uint64_t offset) {
    command_offset_ = offset;
  }
 
  virtual std::ostream& print(std::ostream& os) const;
 
  void accept(Visitor& visitor) const override;
 
  static bool is_linkedit_data(const LoadCommand& cmd);
 
  template<class T>
  const T* cast() const {
    static_assert(std::is_base_of<LoadCommand, T>::value,
                  "Require LoadCommand inheritance");
    if (T::classof(this)) {
      return static_cast<const T*>(this);
    }
    return nullptr;
  }
 
  template<class T>
  T* cast() {
    return const_cast<T*>(static_cast<const LoadCommand*>(this)->cast<T>());
  }
 
 
  LIEF_API friend std::ostream& operator<<(std::ostream& os,
                                           const LoadCommand& cmd) {
    return cmd.print(os);
  }
 
  protected:
  raw_t original_data_;
  LoadCommand::TYPE command_ = LoadCommand::TYPE::UNKNOWN;
  uint32_t size_ = 0;
  uint64_t command_offset_ = 0;
};
 
LIEF_API const char* to_string(LoadCommand::TYPE type);
 
}
}
#endif