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February 2004
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2004.02.09 18:07 "Re: Photoshop 8.0 and libtiff", by Frank Warmerdam
Bob Friesenhahn wrote: > Is it possible to use 'unsigned int' or 'unsigned long' instead? The > 32-bit CPU is not going to be able to address more range than an > 'unsigned int' will support. All that a 64-bit signed type buys you is > support for negative values. Does use of an unsigned type cause > problems for the interface? > > Bob Bob, My first thought was, "hey, we already work fine with 4GB files". But upon a bit of review I realize we use unsigned int for toff_t, but a signed int for tsize_t. The comments in tiffio.h mention that tsize_t is int32 and not uint32 because some functions return -1. So, I think that is why uint32 isn't used now. I do kind of wonder if the code could be changed somehow to use uint32 for tsize_t but recognise 0xffffffff as end-of-file, instead of -1. There couldn't be something 0xffffffff bytes long in a file of 4GB or less anyways since there is always some other overhead. I am hesitant to change tsize_t to a 64 bit type without careful review. Andrey, perhaps you could create a bug report on this issue and when you have some time dig into a solution for tiff files with chunks of larger than 2GB? Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent