Re: More thoughts on Lua 5.2

[David Given <dg@...>]

Luiz Henrique de Figueiredo wrote:
> > Also, 64 bit file offsets can't be expressed inside a standard Lua 
> > number (which only have 32 bits of integer precision).
>
> IEEE doubles can store 52 bits of integer precision (but it does not
> help in this case).

They certainly do --- apparently it's not my day today.

However, since 52 bit offsets are capable of handling files up to two 
exabytes long (including a bit for the sign; and assuming I haven't made 
a trivial mistake in the maths, which is certainly possible right now), 
I think the OP could probably solve their immediate problem by patching 
io to use fseeko and ftello and to pass offsets around as doubles. Call 
it... medium file support.

2EB of enough to store 20 years of continuous DV. I don't really know 
why I worked that out.

--
David Given
dg@cowlark.com