id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5237	filtering_ostream produce incorrect empty files with gzip_compressor and other filters	come.raczy@…	Jonathan Turkanis	"The attached program should produce an empty gzip file, using the gzip_compressor:
{{{
int main()
{
    using namespace boost::iostreams;
    filtering_ostream os;
    os.push(boost::iostreams::gzip_compressor());
    os.push(boost::iostreams::file_sink(""emptyGzipBug.txt.gz""));
}
}}}
The resulting file is not a gzip file:
{{{
$ hexdump emptyGzipBug.txt.gz 
0000000 0003                                   
0000002
$ zcat testGzipEmpty.txt.gz 

zcat: testGzipEmpty.txt.gz: not in gzip format
$
}}}

A workaround is to manually force an empty write into the stack of components with something like this:
{{{
    char dummy = 'b';
    os.component<gzip_compressor>(0)->write(*os.component<file_sink>(1), &dummy, 0);
}}}
The problem seems to affect all versions, including Boost 1.46.0
"	Bugs	closed	To Be Determined	iostreams	Boost 1.60.0	Problem	fixed		tiwoc@…