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Subject: Re: [Tiff] SIGSEGV within TIFFGetField()
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From: Roger Leigh via Tiff <tiff@lists.osgeo.org>
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> On 11 Dec 2020, at 21:43, <paavo@osa.pri.ee> <paavo@osa.pri.ee> wrote:
>=20
> One thing which has frustrated me with custom tags is that (AFAICT) =
you can only register a custom tag on an open TIFF handle, which means =
you still get a bunch of warnings about unknown tags when you open the =
file and it reads the first IFD, before you have a chance to do the =
registration.  Anyone know if there=E2=80=99s a way around that?
> =20
> =20
> Sure, you register your own warning handler and ignore those warnings:

Thanks for the suggestion, but it seems like this will suppress *all* =
warnings unless I do additional (fragile) filtering on top of that.  I =
don=E2=80=99t want to hide other legitimate warnings.  I=E2=80=99d =
really prefer to avoid the warnings in the first place by being able to =
register the custom tags globally so they are always available within =
the application.

Regards,
Roger


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
11 Dec 2020, at 21:43, &lt;<a href=3D"mailto:paavo@osa.pri.ee" =
class=3D"">paavo@osa.pri.ee</a>&gt; &lt;<a =
href=3D"mailto:paavo@osa.pri.ee" class=3D"">paavo@osa.pri.ee</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><ul type=3D"disc" style=3D"margin-bottom: 0cm; =
margin-top: 0cm;" class=3D""><li class=3D"MsoListParagraph" =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;">One thing which has frustrated me with custom tags =
is that (AFAICT) you can only register a custom tag on an open TIFF =
handle, which means you still get a bunch of warnings about unknown tags =
when you open the file and it reads the first IFD, before you have a =
chance to do the registration. &nbsp;Anyone know if there=E2=80=99s a =
way around that?<o:p class=3D""></o:p></li></ul><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sure, you register your own warning handler and ignore those =
warnings:<o:p class=3D""></o:p></div></div></div></blockquote><br =
class=3D""></div><div>Thanks for the suggestion, but it seems like this =
will suppress *all* warnings unless I do additional (fragile) filtering =
on top of that. &nbsp;I don=E2=80=99t want to hide other legitimate =
warnings. &nbsp;I=E2=80=99d really prefer to avoid the warnings in the =
first place by being able to register the custom tags globally so they =
are always available within the application.</div><div><br =
class=3D""></div><div>Regards,</div><div>Roger</div><br =
class=3D""></body></html>=

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