76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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Copyright (c) 2015, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 "compression_zlib_writer.h"
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using namespace Mysql::Tools::Dump;
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void Compression_zlib_writer::process_buffer(bool flush_stream)
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{
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do
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{
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m_compression_context.avail_out= Compression_zlib_writer::buffer_size;
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m_compression_context.next_out= (Bytef*)&m_buffer[0];
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int res= deflate(&m_compression_context,
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flush_stream ? Z_FINISH : Z_NO_FLUSH);
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if (res == Z_STREAM_ERROR)
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{
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this->pass_message(Mysql::Tools::Base::Message_data(
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0, "zlib compression failed",
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Mysql::Tools::Base::Message_type_error));
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}
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this->append_output(std::string(&m_buffer[0],
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Compression_zlib_writer::buffer_size - m_compression_context.avail_out));
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}
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while (m_compression_context.avail_in > 0);
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}
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void Compression_zlib_writer::append(const std::string& data_to_append)
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{
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my_boost::mutex::scoped_lock lock(m_zlib_mutex);
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m_compression_context.avail_in= data_to_append.size();
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m_compression_context.next_in= (Bytef*)data_to_append.c_str();
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this->process_buffer(false);
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}
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Compression_zlib_writer::~Compression_zlib_writer()
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{
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my_boost::mutex::scoped_lock lock(m_zlib_mutex);
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this->process_buffer(true);
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deflateEnd(&m_compression_context);
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}
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Compression_zlib_writer::Compression_zlib_writer(
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Mysql::I_callable<bool, const Mysql::Tools::Base::Message_data&>*
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message_handler, Simple_id_generator* object_id_generator,
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uint compression_level)
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: Abstract_output_writer_wrapper(message_handler, object_id_generator)
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{
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memset(&m_compression_context, 0, sizeof(m_compression_context));
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m_buffer.resize(Compression_zlib_writer::buffer_size);
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int ret = deflateInit(&m_compression_context, compression_level);
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if (ret != Z_OK)
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{
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this->pass_message(Mysql::Tools::Base::Message_data(
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0, "zlib compression initialization failed",
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Mysql::Tools::Base::Message_type_error));
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}
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}
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