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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_ZLIB_H_
#define PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_DECOMPRESSION_ALGORITHM_ZLIB_H_
#include "plugin/x/protocol/stream/compression/decompression_algorithm_interface.h"
#include "zlib.h"
#include "my_dbug.h"
namespace protocol {
class Decompression_algorithm_zlib : public Decompression_algorithm_interface {
public:
Decompression_algorithm_zlib() {
m_zstream.zalloc = Z_NULL;
m_zstream.zfree = Z_NULL;
m_zstream.opaque = Z_NULL;
m_zstream.avail_in = 0;
m_zstream.next_in = Z_NULL;
m_zstream.avail_out = 0;
inflateInit(&m_zstream);
}
~Decompression_algorithm_zlib() override { inflateEnd(&m_zstream); }
bool needs_input() const override { return 0 == m_zstream.avail_in; }
void set_input(uint8_t *in_ptr, const int in_size) override {
DBUG_LOG("debug", "set_input(in_size:" << in_size << ")");
DBUG_DUMP("decompress_zlib", in_ptr, in_size);
m_zstream.avail_in = in_size;
m_zstream.next_in = in_ptr;
}
bool decompress(uint8_t *out_ptr, int64_t *out_size) override {
DBUG_TRACE;
DBUG_LOG("debug", "decompress(out_size:" << *out_size << ")");
int k_flush = m_zstream.avail_out ? Z_SYNC_FLUSH : Z_NO_FLUSH;
m_zstream.avail_out = *out_size;
m_zstream.next_out = out_ptr;
const auto result = inflate(&m_zstream, k_flush);
if (Z_OK != result) {
// Ignore STREAM END, on the next interaction if should return an
// error to client.
if (Z_STREAM_END != result) {
m_valid = false;
DBUG_PRINT("info",
("inflate failed with result: %i, flush:%i, avail_out:%i",
static_cast<int>(result), static_cast<int>(k_flush),
static_cast<int>(m_zstream.avail_out)));
*out_size = 0;
return false;
}
}
*out_size -= m_zstream.avail_out;
return true;
}
bool was_error() const override { return !m_valid; }
bool m_valid = true;
z_stream m_zstream;
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_STREAM_COMPRESSION_DECOMPRESSION_ALGORITHM_ZLIB_H_
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