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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_OUTPUT_STREAM_H_
#define PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_OUTPUT_STREAM_H_
#include <google/protobuf/io/zero_copy_stream.h>
#include <memory>
#include <utility>
#include "zlib.h"
#include "my_dbug.h"
#include "plugin/x/protocol/stream/compression/compression_algorithm_interface.h"
namespace protocol {
class Compression_output_stream
: public google::protobuf::io::ZeroCopyOutputStream {
public:
Compression_output_stream(Compression_algorithm_interface *algorithm,
ZeroCopyOutputStream *destination)
: m_algorithm(algorithm), m_destination(destination) {}
~Compression_output_stream() override { Flush(); }
void Flush() {
DBUG_TRACE;
if (m_input_buffer_offset) {
if (!compress_input_buffer()) return;
}
int out_size = 0;
do {
if (!try_to_update_output_buffer()) return;
auto out_ptr = m_output_buffer_ptr + m_output_buffer_offset;
out_size = m_output_buffer_size - m_output_buffer_offset;
if (!m_algorithm->flush(out_ptr, &out_size)) return;
DBUG_LOG("debug", "flush returned " << out_size << " bytes");
m_output_buffer_offset += out_size;
} while (out_size);
m_destination->BackUp(m_output_buffer_size - m_output_buffer_offset);
DBUG_LOG("debug", "Destination backedup to " << m_output_buffer_offset);
m_output_buffer_size = m_output_buffer_offset = 0;
}
bool Next(void **data, int *size) override {
DBUG_TRACE;
if (m_input_buffer_offset == sizeof(m_input_buffer)) {
if (!compress_input_buffer()) return false;
}
*data = static_cast<void *>(m_input_buffer + m_input_buffer_offset);
*size = sizeof(m_input_buffer) - m_input_buffer_offset;
m_input_buffer_offset = sizeof(m_input_buffer);
return true;
}
void BackUp(int count) override { m_input_buffer_offset -= count; }
int64_t ByteCount() const override { return m_all + m_input_buffer_offset; }
private:
bool compress_input_buffer() {
DBUG_TRACE;
m_algorithm->set_input(m_input_buffer, m_input_buffer_offset);
int out_size = 0;
do {
if (!try_to_update_output_buffer()) return false;
auto out_ptr = m_output_buffer_ptr + m_output_buffer_offset;
out_size = m_output_buffer_size - m_output_buffer_offset;
if (!m_algorithm->compress(out_ptr, &out_size)) return false;
DBUG_LOG("debug", "compress returned " << out_size << " bytes");
m_output_buffer_offset += out_size;
} while (out_size);
m_all += m_input_buffer_offset;
m_input_buffer_offset = 0;
return true;
}
bool try_to_update_output_buffer() {
DBUG_TRACE;
if (m_output_buffer_size == m_output_buffer_offset) {
if (!m_destination->Next(reinterpret_cast<void **>(&m_output_buffer_ptr),
&m_output_buffer_size)) {
DBUG_PRINT("debug", ("Next() returned failed"));
return false;
}
DBUG_LOG("debug",
"Destination returned buffer of size " << m_output_buffer_size);
m_output_buffer_offset = 0;
}
return true;
}
Compression_algorithm_interface *m_algorithm;
ZeroCopyOutputStream *m_destination;
int64_t m_all = 0;
int m_input_buffer_offset = 0;
int m_input_buffer_data_size = 0;
uint8_t m_input_buffer[10];
uint8_t *m_output_buffer_ptr = nullptr;
int m_output_buffer_offset = 0;
int m_output_buffer_size = 0;
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_OUTPUT_STREAM_H_
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