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April 2004
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2004.04.15 02:17 "Re: Large TIFF files", by Lynn Quam
Frank Warmerdam replied: > Lynn Quam wrote: > > What is the status of very large TIFF files. > > > > By very large I mean larger than 2^31 or 2^32 bytes. > > > > Is there any plan to support the POSIX off_t file offsets? > > Lynn, > > Files up to 4GB (2^32 bytes) work fine depending on how things are built. > It should work well by default on modern Win32, Linux and Solaris systems > for instance. Offsets are managed as unsigned 32 bit integers. > > There is relatively little point in any further changes unless a way of > representing offsets of greater than 2^32 is added to the TIFF format. There > have been various discussions, but no concrete effortto move on the >4GB > issue. With the AMD-64 and Intel 64-bit clone of it, we are on the verge of a transition to inexpensive 64-bit computer systems. TIFF needs to evolve in preparation for 64-bit systems. The file format probably needs a extension for large files with 64 bit offsets, and it would be nice if these files could be read on 32-bit systems.