binary_source.hh

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/*
 * libkeepass - KeePass key database importer/exporter
 * Copyright (C) 2014 Christian Kindahl
 * Copyright (C) 2024 Dominik Krümpelmann
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <cstddef>
#include <memory>
#include <ostream>
 
#include "libkeepass/export.hh"
#include "libkeepass/secure.hh"
 
namespace keepass {
namespace detail {
 
class LIBKEEPASS_API BinarySource {
public:
  virtual ~BinarySource() = default;
 
  virtual std::size_t size() const noexcept = 0;
 
 
  virtual void Read(std::size_t offset, void* dst, std::size_t size) const = 0;
 
 
  virtual void WriteTo(std::ostream& dst) const = 0;
};
 
class LIBKEEPASS_API BufferBinarySource final : public BinarySource {
public:
  BufferBinarySource(std::shared_ptr<const SecureBytes> buffer, std::size_t offset,
                     std::size_t size);
 
  std::size_t size() const noexcept override { return size_; }
 
  void Read(std::size_t offset, void* dst, std::size_t size) const override;
  void WriteTo(std::ostream& dst) const override;
 
private:
  std::shared_ptr<const SecureBytes> buffer_;
  std::size_t offset_ = 0;
  std::size_t size_ = 0;
};
 
} // namespace detail
} // namespace keepass