id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6994	gzip_decompressor issue with unusual files	Gavin Band <gavinband@…>	Jonathan Turkanis	"The gzip_decompressor implementation fails on gzip files that contain an empty block after a non-empty one.  (You can make such a file by gzipping a nonempty and an empty file and concatenating them, but they are also sometimes written by other tools.)  Here such a file:

$ hexdump -C hello.txt.gz 
00000000  1f 8b 08 00 0d ea b4 4f  00 03 cb 48 cd c9 c9 57  |.......O...H...W|
00000010  28 c9 48 2d 4a e5 02 00  8e 45 d1 59 0c 00 00 00  |(.H-J....E.Y....|
00000020  1f 8b 08 00 18 ea b4 4f  00 03 03 00 00 00 00 00  |.......O........|
00000030  00 00 00 00                                       |....|
00000034

My file reading code is:

/* test.cpp */
#include <iostream>
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/filter/gzip.hpp>
#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/device/file.hpp>

int main( int, char** ) {
	boost::iostreams::filtering_istream stream ;
	stream.push( boost::iostreams::gzip_decompressor() ) ;
	boost::iostreams::file_source file( argv[1] ) ;
	stream.push( file ) ;
	boost::iostreams::copy( stream, std::cout ) ;
}

Using gunzip on the above file works fine:
$ gunzip -c ../hello.txt.bgz 
Hello, this is a test file.

Using the test program does not:
$ ./test  ../hello.txt.bgz 
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::iostreams::gzip_error> >'
  what():  gzip error

"	Bugs	new	To Be Determined	iostreams	Boost 1.49.0	Problem		gzip gzip_decompressor bgzip