[boost] [iostreams] Reading a part of file

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-03-16 09:24:41

Hello,
I wonder if the iostreams library allows me to get an istream that will read a 
part of a file. That is: I specify a file, start offset and end offset. The 
resulting istream begins reading at start offset and returns EOF when it 
arrives at end offset.

I haven't found anything like this in the docs and I also don't know if such 
functionality makes sense for the library. I just need to read individual 
members of Unix static archives (.a files) and wanted to know if the library 
can help here. If not, I'll just read the data into strstream.

Also: the POSIX mmap call allows one to specify start and end offset. However, 
the mapped_file_source does not allow to specify that, and documentation does 
not clearly explain why one would want to use that class at all.

TIA,
Volodya