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/*
* Copyright (c) 2019, 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 PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_COMPRESSION_ALGORITHM_ZSTD_H_
#define PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_COMPRESSION_ALGORITHM_ZSTD_H_
#include <cstdint>
#include <memory>
#include <utility>
#include "my_compiler.h"
#include "my_dbug.h" // NOLINT(build/include_subdir)
#include "zstd.h" // NOLINT(build/include_subdir)
#include "plugin/x/protocol/stream/compression/compression_algorithm_interface.h"
namespace protocol {
class Compression_algorithm_zstd : public Compression_algorithm_interface {
public:
explicit Compression_algorithm_zstd(const int32_t level)
: m_stream{ZSTD_createCStream()} {
#if ZSTD_VERSION_NUMBER < 10400
is_error(ZSTD_initCStream(m_stream, level));
#else
if (is_error(ZSTD_CCtx_reset(m_stream, ZSTD_reset_session_only)) ||
is_error(ZSTD_CCtx_refCDict(m_stream, nullptr)) ||
is_error(
ZSTD_CCtx_setParameter(m_stream, ZSTD_c_compressionLevel, level)))
return;
#endif
}
~Compression_algorithm_zstd() override { ZSTD_freeCStream(m_stream); }
void set_pledged_source_size(const int src_size [[maybe_unused]]) override {
DBUG_TRACE;
DBUG_LOG("debug", "set_pledged_source_size(" << src_size << ")");
#if ZSTD_VERSION_NUMBER < 10400
// is_error(ZSTD_resetCStream(m_stream, src_size));
#else
if (!is_error(ZSTD_CCtx_reset(m_stream, ZSTD_reset_session_only)))
is_error(ZSTD_CCtx_setPledgedSrcSize(m_stream, src_size));
#endif
}
void set_input(uint8_t *in_ptr, const int in_size) override {
DBUG_TRACE;
m_in_buffer = ZSTD_inBuffer{in_ptr, static_cast<size_t>(in_size), 0};
m_flush_finished = false;
}
bool compress(uint8_t *out_ptr, int *out_size) override {
DBUG_TRACE;
if (m_error) return false;
ZSTD_outBuffer out_buffer{out_ptr, static_cast<size_t>(*out_size), 0};
while (m_in_buffer.pos < m_in_buffer.size) {
#if ZSTD_VERSION_NUMBER < 10400
if (is_error(ZSTD_compressStream(m_stream, &out_buffer, &m_in_buffer))) {
#else
if (is_error(ZSTD_compressStream2(m_stream, &out_buffer, &m_in_buffer,
ZSTD_e_continue))) {
#endif
*out_size = 0;
return false;
}
}
DBUG_LOG("debug", "zstandard(in_pos:" << m_in_buffer.pos << ")");
*out_size = static_cast<int>(out_buffer.pos);
return true;
}
bool flush(uint8_t *out_ptr, int *out_size) override {
DBUG_TRACE;
if (m_error) return false;
if (m_flush_finished) {
*out_size = 0;
return true;
}
ZSTD_outBuffer out_buffer{out_ptr, static_cast<size_t>(*out_size), 0};
#if ZSTD_VERSION_NUMBER < 10400
const auto result = ZSTD_flushStream(m_stream, &out_buffer);
#else
const auto result =
ZSTD_compressStream2(m_stream, &out_buffer, &m_in_buffer, ZSTD_e_end);
#endif
if (is_error(result)) {
*out_size = 0;
return false;
}
DBUG_LOG("debug", "zstandard(out_size:" << *out_size << "), executed with "
<< result);
*out_size = static_cast<int>(out_buffer.pos);
m_flush_finished = result == 0;
return true;
}
#if ZSTD_VERSION_NUMBER < 10400
static int32_t get_level_min() { return 3; }
static int32_t get_level_max() { return 3; }
#else
static int32_t get_level_min() { return ZSTD_minCLevel(); }
static int32_t get_level_max() { return ZSTD_maxCLevel(); }
#endif
private:
bool is_error(const uint64_t result) {
if (!ZSTD_isError(result)) return false;
DBUG_LOG("debug", "ZSTD error: " << ZSTD_getErrorName(result));
return m_error = true;
}
ZSTD_CStream *m_stream;
ZSTD_inBuffer m_in_buffer{nullptr, 0, 0};
bool m_error{false};
bool m_flush_finished{false};
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_COMPRESSION_ALGORITHM_ZSTD_H_
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