AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2018.12.11 13:36 "[Tiff] SeekOK and WriteOK", by Emmanuel Cosnard
2018.12.11 14:29 "Re: [Tiff] SeekOK and WriteOK", by Nicolas RUFF
2018.12.11 18:54 "Re: [Tiff] SeekOK and WriteOK", by Bob Friesenhahn
2018.12.11 14:09 "Re: [Tiff] SeekOK and WriteOK", by Emmanuel Cosnard
2018.12.11 14:01 "Re: [Tiff] SeekOK and WriteOK", by Bob Friesenhahn
2018.12.11 14:24 "Re: [Tiff] SeekOK and WriteOK", by Emmanuel Cosnard
2018.12.12 08:53 "Re: [Tiff] SeekOK and WriteOK", by Emmanuel Cosnard
2018.12.13 11:04 "Re: [Tiff] SeekOK and WriteOK", by Emmanuel Cosnard
2018.12.13 13:13 "Re: [Tiff] SeekOK and WriteOK", by Paavo Helde

2018.12.12 08:53 "Re: [Tiff] SeekOK and WriteOK", by Emmanuel Cosnard

I actually noticed that I never get any problem with the SeekOK, but only with writeOK.

I sometimes returns -1 although he wrote everything I wanted to, and sometimes returns -1 and doesn't write anything but I have no clue why on some occasions he doesn't write...

________________________________
De: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
Envoyé: mardi 11 décembre 2018 18:54
À: Nicolas RUFF
Cc: emmanuel.cosnard@outlook.fr; tiff@lists.osgeo.org
Objet: Re: [Tiff] SeekOK and WriteOK

On Tue, 11 Dec 2018, Nicolas RUFF wrote:

> This might be by design of the API :)
> http://bugzilla.maptools.org/show_bug.cgi?id=2726
>
> lseek() returns -1 in both cases:
> - lseek(-1, SEEK_SET)
> - An error occurred
>
> You have to clear then check errno to distinguish between cases.

One approach is to call 'lseek(fd,SEEK_CUR)' and verify that the
return value is the expected offset.

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt