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September 2004
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2004.09.17 16:34 "Re: BigTIFF Tag Value Count issue", by Fernando Loygorri
> I have the same problem in Delphi. But I decided to just not > care. What are the odds of a file growing beyond 2^63-1 bytes? As I asked in another reply, what is the problem with the spec limiting the size to 2^63-1 instead of 2^64-1, then? > If you're unsure about that, another option is to always > check whether the 64bit value is negative, and if it is, error > out. But, then I cannot claim that the tool I write supports BigTIFF, just a subset of it, which is no good for my purposes. > And even if it is a problem, adjusting the spec to compensate for our > implementation trouble, is, I think, not very good practice. > The major factor in spec design should be logic, instead, and this > logically is an unsigned value and there is no logical reason to > discriminate bit 63. I disagree. There is nothing magic about the number 64. When 32 bits were becoming a straitjacket, the jump to 64 bits was made because we already have a convenient data type for it in languages like C. The equally convenient value for Java and Delphi is 63. Regards, FGL