Support Requests item #1299123, was opened at 2005-09-22 15:00 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=207586&aid=1299123&group_id=7586 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: jpstanley (jpstanley) Assigned to: Nobody/Anonymous (nobody) Summary: Boost.Iostreams and newline translation Initial Comment: I like the Boost.Iostreams framework in Boost 1.33. But I haven't found a way to make it do exactly what I want. I maintain software that parses files out of disk images instead of the local file system. I'd like to be able to wrap a C++ istream around my raw binary read/seek APIs to make it easier to parse data from disk images and interface with existing code. Boost.Iostreams makes this job a piece of cake--except that I haven't found a way to make the stream act like an ifstream opened in text mode (I'm on Win32, btw). In other words, I'd like to have CR, LF, and CRLF line endings translated into \n when I read the data. There is a newline_filter class provided which does nearly exactly what I want--but it doesn't support seeking. I still need seekg() and tellg() to work. I tried writing my own filter, but I ran into some problems. It seems the Boost stream buffer class is built on the assumption that this will hold: std::streamsize P0 = str.tellg(); str.read(buf, 100); std::streamsize P1 = str.tellg(); assert(P1 - P0 == 100); But with an ifstream opened in text mode, this assertion can fail (P1 - P0 > 100) if two-character CRLF combinations were translated into a one-character newline in the intervening data. Is it possible to implement an input-seekable filter that will let a Boost.Iostream behave this way? ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=207586&aid=1299123&group_id=7586 ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ Boost-bugs mailing list Boost-bugs@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs