id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
586,iostreams // file_descriptor::seek  BUG on files > 4 GB,nobody,Jonathan Turkanis,"{{{

Boost 1.33.1
iostreams library
file_descriptor::seek() method
file_descriptor.cpp, line 198
Win32, Visual C++ 2005

The method seek() can return a wrong value of a newly 
set offset when the offset is further than 4 GB.

//---------------
return offset_to_position((lDistanceToMoveHigh << 32) 
+ dwResultLow);
//---------------

The code above has a bug. On 32-bit systems the 
expression (lDistanceToMoveHigh << 32) equals to 
lDistanceToMoveHigh.

The correct code should first cast the 
lDistanceToMoveHigh variable to 64-bit and then shift 
it.

//---------------
return (static_cast<boost::intmax_t> 
lDistanceToMoveHigh) << 32) + dwResultLow;
//---------------


Sergey Kolodkin
}}}",Patches,closed,,iostreams,None,Problem,fixed,,