85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
/*
|
|
Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
|
|
|
|
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 also distributed 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 included with MySQL.
|
|
|
|
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
|
|
*/
|
|
|
|
#include "client/dump/compression_zlib_writer.h"
|
|
#include "template_utils.h"
|
|
|
|
#include <functional>
|
|
|
|
using namespace Mysql::Tools::Dump;
|
|
|
|
void Compression_zlib_writer::process_buffer(bool flush_stream) {
|
|
do {
|
|
m_compression_context.avail_out = Compression_zlib_writer::buffer_size;
|
|
m_compression_context.next_out = (Bytef *)&m_buffer[0];
|
|
|
|
int res =
|
|
deflate(&m_compression_context, flush_stream ? Z_FINISH : Z_NO_FLUSH);
|
|
|
|
if (res == Z_STREAM_ERROR) {
|
|
this->pass_message(Mysql::Tools::Base::Message_data(
|
|
0, "zlib compression failed",
|
|
Mysql::Tools::Base::Message_type_error));
|
|
}
|
|
|
|
this->append_output(
|
|
std::string(&m_buffer[0], Compression_zlib_writer::buffer_size -
|
|
m_compression_context.avail_out));
|
|
} while (m_compression_context.avail_in > 0);
|
|
}
|
|
|
|
void Compression_zlib_writer::append(const std::string &data_to_append) {
|
|
std::lock_guard<std::mutex> lock(m_zlib_mutex);
|
|
m_compression_context.avail_in = data_to_append.size();
|
|
m_compression_context.next_in =
|
|
pointer_cast<Bytef *>(const_cast<char *>(data_to_append.data()));
|
|
this->process_buffer(false);
|
|
}
|
|
|
|
Compression_zlib_writer::~Compression_zlib_writer() {
|
|
std::lock_guard<std::mutex> lock(m_zlib_mutex);
|
|
this->process_buffer(true);
|
|
deflateEnd(&m_compression_context);
|
|
}
|
|
|
|
Compression_zlib_writer::Compression_zlib_writer(
|
|
std::function<bool(const Mysql::Tools::Base::Message_data &)>
|
|
*message_handler,
|
|
Simple_id_generator *object_id_generator, uint compression_level)
|
|
: Abstract_output_writer_wrapper(message_handler, object_id_generator),
|
|
m_compression_level(compression_level) {}
|
|
|
|
bool Compression_zlib_writer::init() {
|
|
memset(&m_compression_context, 0, sizeof(m_compression_context));
|
|
m_buffer.resize(Compression_zlib_writer::buffer_size);
|
|
int ret = deflateInit(&m_compression_context, m_compression_level);
|
|
if (ret != Z_OK) {
|
|
this->pass_message(Mysql::Tools::Base::Message_data(
|
|
0, "zlib compression initialization failed",
|
|
Mysql::Tools::Base::Message_type_error));
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|