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/*
Copyright (c) 2015, 2025, 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,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef COMPRESSION_ZLIB_WRITER_INCLUDED
#define COMPRESSION_ZLIB_WRITER_INCLUDED
#include <string.h>
#include <sys/types.h>
#include <zlib.h>
#include <functional>
#include <mutex>
#include "client/dump/abstract_output_writer_wrapper.h"
#include "client/dump/i_output_writer.h"
#include "my_inttypes.h"
namespace Mysql {
namespace Tools {
namespace Dump {
/**
Wrapper to another Output Writer, compresses formatted data stream with zlib.
*/
class Compression_zlib_writer : public I_output_writer,
public Abstract_output_writer_wrapper {
public:
Compression_zlib_writer(
std::function<bool(const Mysql::Tools::Base::Message_data &)>
*message_handler,
Simple_id_generator *object_id_generator, uint compression_level);
~Compression_zlib_writer() override;
bool init() override;
void append(const std::string &data_to_append) override;
// Fix "inherits ... via dominance" warnings
void register_progress_watcher(
I_progress_watcher *new_progress_watcher) override {
Abstract_chain_element::register_progress_watcher(new_progress_watcher);
}
// Fix "inherits ... via dominance" warnings
uint64 get_id() const override { return Abstract_chain_element::get_id(); }
protected:
// Fix "inherits ... via dominance" warnings
void item_completion_in_child_callback(
Item_processing_data *item_processed) override {
Abstract_chain_element::item_completion_in_child_callback(item_processed);
}
private:
void process_buffer(bool flush_stream);
std::mutex m_zlib_mutex;
z_stream m_compression_context;
uint m_compression_level;
std::vector<char> m_buffer;
const static int buffer_size = 128 * 1024;
};
} // namespace Dump
} // namespace Tools
} // namespace Mysql
#endif
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