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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_DECOMPRESSION_ALGORITHM_LZ4_H_
#define PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_DECOMPRESSION_ALGORITHM_LZ4_H_
#include <lz4frame.h>
#include "my_dbug.h"
#include "plugin/x/protocol/stream/compression/decompression_algorithm_interface.h"
namespace protocol {
class Decompression_algorithm_lz4 : public Decompression_algorithm_interface {
public:
Decompression_algorithm_lz4() {
LZ4F_createDecompressionContext(&m_ctxt, LZ4F_VERSION);
}
~Decompression_algorithm_lz4() override {
LZ4F_freeDecompressionContext(m_ctxt);
}
bool needs_input() const override { return m_decoded_whole_input; }
void set_input(uint8_t *in_ptr, const int in_size) override {
DBUG_TRACE;
m_input_buffer_data_size = in_size;
m_input_buffer_ptr = in_ptr;
m_decoded_whole_input = false;
}
bool decompress(uint8_t *out_ptr, int64_t *out_size) override {
DBUG_TRACE;
size_t output_buffer_size = *out_size;
size_t input_size = static_cast<size_t>(m_input_buffer_data_size);
const auto result =
LZ4F_decompress(m_ctxt, out_ptr, &output_buffer_size,
m_input_buffer_ptr, &input_size, nullptr);
if (LZ4F_isError(result)) {
m_valid = false;
DBUG_LOG("debug", "LZ4F error:" << LZ4F_getErrorName(result));
*out_size = 0;
return false;
}
*out_size = output_buffer_size;
m_input_buffer_data_size -= input_size;
m_input_buffer_ptr += input_size;
m_decoded_whole_input = (result == 0 || output_buffer_size == 0) &&
0 == m_input_buffer_data_size;
DBUG_LOG("debug", "out_size:" << *out_size
<< ", need-more:" << m_decoded_whole_input);
return true;
}
bool was_error() const override {
DBUG_TRACE;
return !m_valid;
}
private:
LZ4F_decompressionContext_t m_ctxt;
int m_input_buffer_data_size = 0;
bool m_decoded_whole_input = true;
uint8_t *m_input_buffer_ptr = nullptr;
bool m_valid = true;
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_DECOMPRESSION_ALGORITHM_LZ4_H_
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