2005.11.23 04:51 "Re: [Tiff] libtiff and over 4GB files", by Bob Friesenhahn
Detection of invalid offsets could be an interesting proposition on 32-bit systems which don't support large files. Detection of rollover on a 32-bit integer may be a challenge to reliably implement. Sometimes the off_t type supports 2GB access while other times it supports terrabytes. Hopefully the system libraries are reliable at reporting writes beyond what is supported.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/