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 id 670edb76-172fca87bfbc8733; Sun, 11 Dec 2022 17:37:51 +0100
Authentication-Results: mx101.skynet.be; dkim=none (message not signed) header.i=none; spf=None smtp.pra=tiff-bounces@lists.osgeo.org; spf=Pass smtp.mailfrom=SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org; spf=PermError smtp.helo=postmaster@lists.osgeo.org
Received-SPF: None (mx101.skynet.be: no sender authenticity
  information available from domain of
  tiff-bounces@lists.osgeo.org) identity=pra;
  client-ip=140.211.15.3; receiver=mx101.skynet.be;
  envelope-from="SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="tiff-bounces@lists.osgeo.org";
  x-conformance=sidf_compatible
Received-SPF: Pass (mx101.skynet.be: domain of
  SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org
  designates 140.211.15.3 as permitted sender)
  identity=mailfrom; client-ip=140.211.15.3;
  receiver=mx101.skynet.be;
  envelope-from="SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 mx a:mail.osgeo.org a:lists.osgeo.org
  a:mail.osgeo.osuosl.org ip4:140.211.15.3 a:osgeo7.osgeo.org
  a:trac.osgeo.org a:dev.trac.osgeo.org
  a:secure.osgeo.osuosl.org ip4:140.211.15.57
  ip4:140.211.15.32 ip4:140.211.15.26 ip4:140.211.15.6"
Received-SPF: PermError (mx101.skynet.be: cannot correctly
  interpret sender authenticity information from domain of
  postmaster@lists.osgeo.org) identity=helo;
  client-ip=140.211.15.3; receiver=mx101.skynet.be;
  envelope-from="SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="postmaster@lists.osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text=""
X-Ironport-Dmarc-Check-Result: validskip
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X-Proximus-Mfrom: SRS0=4gx+=4J=lists.osgeo.org=tiff-bounces@osgeo.org
X-Proximus-Rcpto: chris.lindelaan@skynet.be
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From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Subject: Re: [Tiff] libtiff v4.5.0 release candidate available
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>
> "TIFFReadDirectory: Warning, Didn't read next directory due to IFD looping at 
> offset 0xa7ff1e (11009822) to offset 0x8 (8)."
>
> Error: "Cannot handle more than 65535 TIFF directories"
>
> The test file at 
> <https://github.com/cgohlke/imagecodecs/blob/master/tests/tiff/gray.movie.u2.tif> 
> contains 65567 pages.

This test file reveals something else which is concerning.  I ran a 
profiler on GraphicsMagick while it was reading this file and I see 
that 53% of the time is being spent in _TIFFCheckDirNumberAndOffset().

Most of the time is being spent in the code associated with "Check if 
offset is already in the list".

I assumed that most of the time would be spent in GraphicsMagick code.

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
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