text: /*
   * Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
   * Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #pragma once
  
  #include <AK/Types.h>
  
  namespace PDF {
  
  class Reference {
      // We store refs as u32, with 18 bits for the index and 14 bits for the
      // generation index. The generation index is stored in the higher bits.
      // This may need to be rethought later, as the max generation index is
      // 2^16 and the max for the object index is probably 2^32 (I don't know
      // exactly)
      static constexpr auto MAX_REF_INDEX = (1 << 19) - 1;            // 2 ^ 19 - 1
      static constexpr auto MAX_REF_GENERATION_INDEX = (1 << 15) - 1; // 2 ^ 15 - 1
  
  public:
      Reference(u32 index, u32 generation_index)
      {
          VERIFY(index < MAX_REF_INDEX);
          VERIFY(generation_index < MAX_REF_GENERATION_INDEX);
          m_combined = (generation_index << 14) | index;
      }
  
      [[nodiscard]] ALWAYS_INLINE u32 as_ref_index() const
      {
          return m_combined & 0x3ffff;
      }
  
      [[nodiscard]] ALWAYS_INLINE u32 as_ref_generation_index() const
      {
          return m_combined >> 18;
      }
  
  private:
      u32 m_combined;
  };
  
  }
  