stream.cc
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stream.cc
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	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019-2020
	* \copyright GPLv2 or later
	*/
	#include "HEJ/stream.hh"

	#include <array>

	#include <boost/iostreams/filter/gzip.hpp>

	namespace HEJ {

	namespace {
	bool is_gzip(std::ifstream & file){
	static constexpr std::array<char,2> magic_bytes = {'\x1f', '\x8b'};
	if(file.peek() != magic_bytes[0]) return false;
	file.get();
	const char second = file.peek();
	file.unget();
	return second == magic_bytes[1];
	}
	}

	istream::istream(std::string const & filename):
	file_{filename, std::ios_base::in \| std::ios_base::binary},
	stream_{std::make_unique<boost_istream>()}
	{
	if(is_gzip(file_)){
	stream_->push(boost::iostreams::gzip_decompressor{});
	}
	stream_->push(file_);
	}
	} // namespace HEJ