79 lines
3.2 KiB
C++
79 lines
3.2 KiB
C++
/*
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Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "client/dump/compression_lz4_writer.h"
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#include <functional>
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using namespace Mysql::Tools::Dump;
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void Compression_lz4_writer::prepare_buffer(size_t src_size) {
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// bug in lz4 (fixed in their r124).
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LZ4F_preferences_t null_preferences;
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memset(&null_preferences, 0, sizeof(LZ4F_preferences_t));
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m_buffer.resize(LZ4F_compressBound(src_size, &null_preferences));
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}
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void Compression_lz4_writer::process_buffer(size_t lz4_result) {
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if (LZ4F_isError(lz4_result)) {
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this->pass_message(Mysql::Tools::Base::Message_data(
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0, "LZ4 compression failed", Mysql::Tools::Base::Message_type_error));
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} else if (lz4_result > 0) {
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this->append_output(std::string(&m_buffer[0], lz4_result));
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}
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}
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void Compression_lz4_writer::append(const std::string &data_to_append) {
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std::lock_guard<std::mutex> lock(m_lz4_mutex);
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if (m_buffer.capacity() == 0) {
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LZ4F_createCompressionContext(&m_compression_context, LZ4F_VERSION);
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this->prepare_buffer(0);
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this->process_buffer(LZ4F_compressBegin(m_compression_context,
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(void *)&m_buffer[0],
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m_buffer.capacity(), NULL));
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}
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this->prepare_buffer(data_to_append.size());
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this->process_buffer(LZ4F_compressUpdate(
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m_compression_context, (void *)&m_buffer[0], m_buffer.capacity(),
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data_to_append.c_str(), data_to_append.size(), NULL));
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}
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Compression_lz4_writer::~Compression_lz4_writer() {
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std::lock_guard<std::mutex> lock(m_lz4_mutex);
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if (m_buffer.capacity() != 0) {
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this->process_buffer(LZ4F_compressEnd(m_compression_context,
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(void *)&m_buffer[0],
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m_buffer.capacity(), NULL));
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LZ4F_freeCompressionContext(m_compression_context);
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}
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}
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Compression_lz4_writer::Compression_lz4_writer(
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std::function<bool(const Mysql::Tools::Base::Message_data &)>
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*message_handler,
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Simple_id_generator *object_id_generator)
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: Abstract_output_writer_wrapper(message_handler, object_id_generator) {}
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bool Compression_lz4_writer::init() { return false; }
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