none_comp.h

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/* Copyright (c) 2019, 2024, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
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#ifndef MYSQL_BINLOG_EVENT_COMPRESSION_NONE_COMP_H
#define MYSQL_BINLOG_EVENT_COMPRESSION_NONE_COMP_H
 
#include "mysql/binlog/event/compression/compressor.h"
#include "mysql/utils/nodiscard.h"
 
namespace mysql::binlog::event::compression {
 
/// Compressor subclass that only copies input to output without
/// compressing it.
class None_comp : public Compressor {
 public:
  using typename Compressor::Char_t;
  using typename Compressor::Managed_buffer_sequence_t;
  using typename Compressor::Size_t;
  static constexpr type type_code = NONE;
 
 private:
  /// @return NONE
  type do_get_type_code() const override;
 
  /// @copydoc Compressor::do_reset
  ///
  /// No-op for this class.
  void do_reset() override;
 
  /// @copydoc Compressor::do_feed
  void do_feed(const Char_t *input_data, Size_t input_size) override;
 
  /// @copydoc Compressor::do_compress
  ///
  /// For None_comp, this is guaranteed to produce all output on
  /// success.
  [[NODISCARD]] Compress_status do_compress(
      Managed_buffer_sequence_t &out) override;
 
  /// @copydoc Compressor::do_finish
  ///
  /// For None_comp, this is equivalent to @c compress.
  [[NODISCARD]] Compress_status do_finish(
      Managed_buffer_sequence_t &out) override;
 
  /// Data previously provided to @c do_feed.
  const Char_t *m_input_data{nullptr};
 
  /// Size data previously provided to @c do_feed.
  Size_t m_input_size{0};
};
 
}  // namespace mysql::binlog::event::compression
 
#endif  // MYSQL_BINLOG_EVENT_COMPRESSION_NONE_COMP_H