76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
|
|
Copyright (c) 2015, 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 as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
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 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 "compression_lz4_writer.h"
|
|
|
|
using namespace Mysql::Tools::Dump;
|
|
|
|
void Compression_lz4_writer::prepare_buffer(size_t src_size)
|
|
{
|
|
// bug in lz4 (fixed in their r124).
|
|
LZ4F_preferences_t null_preferences;
|
|
memset(&null_preferences, 0, sizeof(LZ4F_preferences_t));
|
|
m_buffer.resize(LZ4F_compressBound(src_size, &null_preferences));
|
|
}
|
|
|
|
void Compression_lz4_writer::process_buffer(size_t lz4_result)
|
|
{
|
|
if (LZ4F_isError(lz4_result))
|
|
{
|
|
this->pass_message(Mysql::Tools::Base::Message_data(
|
|
0, "LZ4 compression failed",
|
|
Mysql::Tools::Base::Message_type_error));
|
|
}
|
|
else if (lz4_result > 0)
|
|
{
|
|
this->append_output(std::string(&m_buffer[0], lz4_result));
|
|
}
|
|
}
|
|
|
|
void Compression_lz4_writer::append(const std::string& data_to_append)
|
|
{
|
|
my_boost::mutex::scoped_lock lock(m_lz4_mutex);
|
|
if (m_buffer.capacity() == 0)
|
|
{
|
|
LZ4F_createCompressionContext(&m_compression_context, LZ4F_VERSION);
|
|
this->prepare_buffer(0);
|
|
this->process_buffer(LZ4F_compressBegin(m_compression_context,
|
|
(void*)&m_buffer[0], m_buffer.capacity(), NULL));
|
|
}
|
|
this->prepare_buffer(data_to_append.size());
|
|
this->process_buffer(LZ4F_compressUpdate(m_compression_context,
|
|
(void*)&m_buffer[0], m_buffer.capacity(), data_to_append.c_str(),
|
|
data_to_append.size(), NULL));
|
|
}
|
|
|
|
Compression_lz4_writer::~Compression_lz4_writer()
|
|
{
|
|
my_boost::mutex::scoped_lock lock(m_lz4_mutex);
|
|
if (m_buffer.capacity() != 0)
|
|
{
|
|
this->process_buffer(LZ4F_compressEnd(m_compression_context,
|
|
(void*)&m_buffer[0], m_buffer.capacity(), NULL));
|
|
LZ4F_freeCompressionContext(m_compression_context);
|
|
}
|
|
}
|
|
|
|
Compression_lz4_writer::Compression_lz4_writer(
|
|
Mysql::I_callable<bool, const Mysql::Tools::Base::Message_data&>*
|
|
message_handler, Simple_id_generator* object_id_generator)
|
|
: Abstract_output_writer_wrapper(message_handler, object_id_generator)
|
|
{}
|