boost 压缩与解压缩流

boost 压缩与解压缩流（zip、zip2、gzip、lzma、zstd压缩方式）

#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <boost/iostreams/filter/bzip2.hpp>
#include <boost/iostreams/filter/gzip.hpp>
#include <boost/iostreams/filter/lzma.hpp>
#include <boost/iostreams/filter/zstd.hpp>

#include <boost/iostreams/device/file_descriptor.hpp>
#include <boost/iostreams/device/file.hpp>

#include <iostream>
#include <sstream>
int main()
{
	try
	{
		// boost::iostreams::zlib_compressor() zip压缩方式
		// boost::iostreams::zip2_compressor() zip2压缩方式
		// boost::iostreams::gzip_compressor()  gzip压缩方式
		// boost::iostreams::lzma_compressor()  lzma压缩方式
		// boost::iostreams::zstd_compressor()  zstd压缩方式
	
		// 压缩数据流
		{
			boost::iostreams::filtering_ostream out;
			out.push(boost::iostreams::zlib_compressor());
			//out.push(ss_comp);	//压缩到字符流中
			out.push(boost::iostreams::file_sink("test.txt"));		//压缩到文件中
			out.write("hello", sizeof("hello") - 1);
			out.write("hellohello", sizeof("hellohello") - 1);
			out.write("hellohello", sizeof("hellohello") - 1);
			out.write("hellohello", sizeof("hellohello" - 1));
			out.write("this is a test", sizeof("this is a test") - 1);
			out.write("hellohello", sizeof("hellohello") - 1);

			std::cout << "compressor data end" << std::endl;
		}

		// 解压缩数据流
		{
			boost::iostreams::filtering_istream in;
			in.push(boost::iostreams::zlib_decompressor());
			//in.push(ss_comp);		//从字符流中解压
			in.push(boost::iostreams::file_source("test.txt"));		//从文件中解压
			char databuf[1024]{ 0 };
			in.read(databuf, sizeof(databuf));

			std::cout << "decompressor data:" << databuf << ", len=" << in.gcount() << std::endl;
		}
	}
	catch (std::exception& e)
	{
		std::cout << "exception:" << e.what() << std::endl;
	}
	catch (...)
	{
		std::cout << "unknown exception." << std::endl;
	}
	system("pause");
	return 0;
}
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