[Coco] DriveWire with filesizes not divisible by 256

[CoCoList for Color Computer Enthusiasts]

Hi Bill,

RSDOS also has a byte in the directory entry which shows the number of 
bytes which are used in the last sector of the file.

Regards, Bob Devries
Dalby, QLD, Australia

On 12/05/2014 7:22 AM, CoCoList for Color Computer Enthusiasts wrote:
> Aaron, I really don't think it would work without rewriting both DECB and the OS9 drivers. RSDOS and OS9 fill out the remaining portion (after EOF) of the last sector(s) differently. RSDOS reservers/writes in "granule" size chunks (as it's smallest possible file), the minimum of 9 sectors (1 gran=9 sectors). OS9 relies on the setting in the device descriptor for it's minimum.
>   
> What would be the advantages of doing this if it could be done?
>   
>
> Bill Pierce
> "Today is a good day... I woke up" - Ritchie Havens
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>   
>   
> -----Original Message-----
> From: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Sun, May 11, 2014 3:45 pm
> Subject: [Coco] DriveWire with filesizes not divisible by 256
>
>
> A couple survey responses have indicted a desire to use files of arbitrary
> size in DriveWire.
>
> Since we only read/write 256 byte sized sectors, what is the correct way to
> do that?  Just fill the last sector with 0?  There isn't a way for the
> server to tell the coco what's part of the file and what's not in the last
> sector, and vice versa the file would become padded to 256 byte boundary if
> the last sector is written, since coco can't tell server the same.  Does
> that matter?  It feels a bit dangerous.
>
> -aaron
>
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