zstd_dec.h

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#ifndef LIBBINLOGEVENTS_COMPRESSION_ZSTD_DEC_H_
#define LIBBINLOGEVENTS_COMPRESSION_ZSTD_DEC_H_
 
#include <zstd.h>
 
#include "decompressor.h"
#include "libbinlogevents/include/nodiscard.h"
 
namespace binary_log {
namespace transaction {
namespace compression {
 
/// Decompressor class that uses the ZSTD library.
class Zstd_dec : public Decompressor {
 public:
  using typename Decompressor::Char_t;
  using typename Decompressor::Grow_constraint_t;
  using typename Decompressor::Size_t;
  static constexpr type type_code = ZSTD;
 
  Zstd_dec();
  ~Zstd_dec() override;
 
  Zstd_dec(const Zstd_dec &) = delete;
  Zstd_dec(const Zstd_dec &&) = delete;
  Zstd_dec &operator=(const Zstd_dec &) = delete;
  Zstd_dec &operator=(const Zstd_dec &&) = delete;
 
 private:
  /// @return ZSTD
  type do_get_type_code() const override;
 
  /// @copydoc Decompressor::do_reset
  void do_reset() override;
 
  /// @copydoc Decompressor::do_feed
  void do_feed(const Char_t *input_data, Size_t input_size) override;
 
  /// @copydoc Decompressor::do_decompress
  [[NODISCARD]] std::pair<Decompress_status, Size_t> do_decompress(
      Char_t *out, Size_t output_size) override;
 
  /// @copydoc Decompressor::do_get_grow_constraint_hint
  Grow_constraint_t do_get_grow_constraint_hint() const override;
 
  /// Deallocate the ZSTD decompression context.
  void destroy();
 
  /// ZSTD decompression context object.
  ZSTD_DStream *m_ctx{nullptr};
 
  /// ZSTD input buffer.
  ZSTD_inBuffer m_ibuf{nullptr, 0, 0};
 
  bool m_frame_boundary = false;
};
 
}  // namespace compression
}  // end of namespace transaction
}  // end of namespace binary_log
 
#endif  // ifndef LIBBINLOGEVENTS_COMPRESSION_ZSTD_DEC_H_