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