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Re: [Bug-gnubg] Two sided bearoff database

From: Michael Petch
Subject: Re: [Bug-gnubg] Two sided bearoff database
Date: Mon, 24 Apr 2006 13:21:38 -0600
User-agent: Microsoft-Entourage/


- Backwards Compatibility (To previous formats - Non issue imho) - the
databases will only work on newer builds.
- If we use a single file format (that is all 64 bit offsets) then we waste
space for databases that require only 32 bits of data. I'd suggest
supporting either a 32 or 64 bit variant by some header information in the
database file.
- Some file systems only support 32 bit offsets (even though the software
may support 64 bit offsets) - IE: older ext2 file systems (Circa Redhat 6),
FAT, FAT32 etc.
- Some older compilers only support 32 bit offsets.
- Some compilers/OS's apparently implement 64 bit offsets a bit differently
on functions like fseek etc.

In the end supporting a larger database is doable, but some work is needed
to make sure the software remains buildable across new and older development

Just an opinion,

On 4/24/06 9:36 AM, "Ian Shaw" <address@hidden> wrote:

> Is it possible yet to generate a database larger than 11 chequers on six
> points? 
> IIRC, the problem is that the pointer into the database file is a 32 bit
> integer, limiting the number of positions that can be addressed.
> -- Ian
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