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September 2004
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2004.09.17 03:08 "Re: BigTIFF Tag Value Count issue", by Chris Cox
At 8:54 PM -0500 9/16/04, Bob Friesenhahn wrote: > There was a time when 640K seemed like a hard limit but that time is > long past. Yesterday 4GB seemed like a hard limit but now 64-bit > PCs can be purchased for under $1000. In a couple of years, most > PCs will come with 4GB of RAM. Years later people may be cursing > the inventors of BigTIFF because they only thought about problems > based on past experiences and didn't think ahead. I was just looking for a new PC, and my first requirement was a motherboard that could go over 4 Gig.... My second requirement was an Athlon64. > > Option 0: stick with 4 byte tag count members (alignment, tag data <= 4 gig, > > Frank's choice) > > Option 1: make it an 8 byte tag count (no alignment, tag data > 4 > > gig allowed) > > Option 2, courtesy of Bob: make it 8 byte tag count, add 4 padding bytes > > (alignment, tag data > 4 gig allowed) > > > > Can I put you down as an option 2 vote, or were you merely signalling the > > option? > > Sure, there should always be a second option so put me down for option 2. :-) Can you think of a situation that needs an 8 byte count? Or do you just want the size increased on general principles? Do you think that increasing the count to 8 bytes would be a problem in libTIFF? Chris