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From: Charles Auer <Bumble731@msn.com>
To: "Michael Shiels [ MaS Software Inc ]" <MaSSoft@massoftware.com>,
	"tiff@lists.maptools.org" <tiff@lists.maptools.org>
Thread-Topic: [Tiff] Interesting change/problem in LibTiff 4.0.7 with
	unsupported	compressions
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Date: Tue, 2 May 2017 14:33:38 +0000
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Subject: Re: [Tiff] Interesting change/problem in LibTiff 4.0.7
	with	unsupported	compressions
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--_000_MWHPR19MB1181388735856EC7A868D766E1170MWHPR19MB1181namp_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

In the meantime, if you need to explore tags, AsTiffTagViewer is a free TIF=
F Tag Viewer application for Windows.

.

http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

.

Charles

.

AsTiffTagViewer - AWare Systems<http://www.awaresystems.be/imaging/tiff/ast=
ifftagviewer.html>
www.awaresystems.be
AsTiffTagViewer, a freeware TIFF Tag Viewer for Windows, download page





________________________________
From: tiff-bounces@lists.maptools.org <tiff-bounces@lists.maptools.org> on =
behalf of Michael Shiels [ MaS Software Inc ] <MaSSoft@massoftware.com>
Sent: Tuesday, May 2, 2017 12:56 PM
To: tiff@lists.maptools.org
Subject: Re: [Tiff] Interesting change/problem in LibTiff 4.0.7 with unsupp=
orted compressions


Just wondering if anyone has thoughts on this problem.  Once I posted it do=
esn=92t=92 seem to have made it into the archive which means maybe it didn=
=92t get through at all??



This is a interesting situation since most people don=92t expect an error j=
ust from enumerating the directory and reading the tags.  Maybe a warning w=
ould be more appropriate specifically for an inability to detail out the co=
mpression specific tags maybe??



Thanks.

Mike



From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.o=
rg] On Behalf Of Michael | Shiels [ MaS \ Software \ Inc ]
Sent: Friday, April 28, 2017 4:38 PM
To: tiff@lists.maptools.org
Subject: [Tiff] Interesting change/problem in LibTiff 4.0.7 with unsupporte=
d compressions



I found a decent change in the behavior of Libtiff =96 after I updated from=
 the 3.5.6/3.5.7 era to the most recent (yes 15 year jump!!)



Specifically this piece of code =96 basically ends up tripping an error if =
the compression is not compiled/activated in the code.  So you can=92t even=
 peruse/move through a file without tripping an error.



               /*

               * An opportunity for compression mode dependent tag fixup

               */

               (*tif->tif_fixuptags)(tif);





Our engine specifically watches for errors and assumes it=92s pretty fatal =
=96 when really it=92s kinda benign =96 UNLESS I want to extract the image =
data itself, right??



Surely that should be pretty benign to just enumerate through a TIFF =96 ev=
en if you don=92t support the compression of each page??



Mike

--_000_MWHPR19MB1181388735856EC7A868D766E1170MWHPR19MB1181namp_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=
n-bottom:0;} --></style>
</head>
<body dir=3D"ltr">
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
-family:Calibri,Arial,Helvetica,sans-serif;" dir=3D"ltr">
<p>In the meantime, if you need to explore tags,&nbsp;<span>AsTiffTagViewer=
 is a free TIFF Tag Viewer application for Windows.</span></p>
<p><span>.</span></p>
<p><span><a href=3D"http://www.awaresystems.be/imaging/tiff/astifftagviewer=
.html" class=3D"OWAAutoLink" id=3D"LPlnk260531" previewremoved=3D"true">htt=
p://www.awaresystems.be/imaging/tiff/astifftagviewer.html</a></span></p>
<p>.</p>
<p>Charles</p>
<p>.<br>
<span></p>
<div id=3D"LPBorder_GT_14937355260840.12181509898979748" style=3D"margin-bo=
ttom: 20px; overflow: auto; width: 100%; text-indent: 0px;">
<table id=3D"LPContainer_14937355260760.2799443775860164" role=3D"presentat=
ion" cellspacing=3D"0" style=3D"width: 90%; background-color: rgb(255, 255,=
 255); position: relative; overflow: auto; padding-top: 20px; padding-botto=
m: 20px; margin-top: 20px; border-top: 1px dotted rgb(200, 200, 200); borde=
r-bottom: 1px dotted rgb(200, 200, 200);">
<tbody>
<tr valign=3D"top" style=3D"border-spacing: 0px;">
<td id=3D"TextCell_14937355260790.3315640303328389" colspan=3D"2" style=3D"=
vertical-align: top; position: relative; padding: 0px; display: table-cell;=
">
<div id=3D"LPRemovePreviewContainer_14937355260790.5111358096037368"></div>
<div id=3D"LPTitle_14937355260790.9601970370162489" style=3D"top: 0px; colo=
r: rgb(0, 120, 215); font-weight: normal; font-size: 21px; font-family: wf_=
segoe-ui_light, &quot;Segoe UI Light&quot;, &quot;Segoe WP Light&quot;, &qu=
ot;Segoe UI&quot;, &quot;Segoe WP&quot;, Tahoma, Arial, sans-serif; line-he=
ight: 21px;">
<a id=3D"LPUrlAnchor_14937355260810.41917487423238176" href=3D"http://www.a=
waresystems.be/imaging/tiff/astifftagviewer.html" target=3D"_blank" style=
=3D"text-decoration: none;">AsTiffTagViewer - AWare Systems</a></div>
<div id=3D"LPMetadata_14937355260810.2462344005189523" style=3D"margin: 10p=
x 0px 16px; color: rgb(102, 102, 102); font-weight: normal; font-family: wf=
_segoe-ui_normal, &quot;Segoe UI&quot;, &quot;Segoe WP&quot;, Tahoma, Arial=
, sans-serif; font-size: 14px; line-height: 14px;">
www.awaresystems.be</div>
<div id=3D"LPDescription_14937355260820.2852104368099426" style=3D"display:=
 block; color: rgb(102, 102, 102); font-weight: normal; font-family: wf_seg=
oe-ui_normal, &quot;Segoe UI&quot;, &quot;Segoe WP&quot;, Tahoma, Arial, sa=
ns-serif; font-size: 14px; line-height: 20px; max-height: 100px; overflow: =
hidden;">
AsTiffTagViewer, a freeware TIFF Tag Viewer for Windows, download page</div=
>
</td>
</tr>
</tbody>
</table>
</div>
<br>
<br>
</span>
<p></p>
<br>
<br>
<div style=3D"color: rgb(0, 0, 0);">
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" co=
lor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> tiff-bounces@lists.ma=
ptools.org &lt;tiff-bounces@lists.maptools.org&gt; on behalf of Michael Shi=
els [ MaS Software Inc ] &lt;MaSSoft@massoftware.com&gt;<br>
<b>Sent:</b> Tuesday, May 2, 2017 12:56 PM<br>
<b>To:</b> tiff@lists.maptools.org<br>
<b>Subject:</b> Re: [Tiff] Interesting change/problem in LibTiff 4.0.7 with=
 unsupported compressions</font>
<div>&nbsp;</div>
</div>
<div>
<div>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">Just wondering if anyone has thoughts on this=
 problem.&nbsp; Once I posted it doesn=92t=92 seem to have made it into the=
 archive which means maybe it didn=92t get through at all??</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">&nbsp;</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">This is a interesting situation since most pe=
ople don=92t expect an error just from enumerating the directory and readin=
g the tags.&nbsp; Maybe a warning would be more appropriate specifically fo=
r an inability to detail out the compression
 specific tags maybe??</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">&nbsp;</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">Thanks.</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">Mike</span></p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<span style=3D"color:#1F497D">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
<b><span style=3D"font-size:10.0pt; font-family:&quot;Tahoma&quot;,&quot;sa=
ns-serif&quot;">From:</span></b><span style=3D"font-size:10.0pt; font-famil=
y:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> tiff-bounces@lists.maptools.o=
rg [mailto:tiff-bounces@lists.maptools.org]
<b>On Behalf Of </b>Michael | Shiels [ MaS \ Software \ Inc ]<br>
<b>Sent:</b> Friday, April 28, 2017 4:38 PM<br>
<b>To:</b> tiff@lists.maptools.org<br>
<b>Subject:</b> [Tiff] Interesting change/problem in LibTiff 4.0.7 with uns=
upported compressions</span></p>
</div>
</div>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
I found a decent change in the behavior of Libtiff =96 after I updated from=
 the 3.5.6/3.5.7 era to the most recent (yes 15 year jump!!)</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
Specifically this piece of code =96 basically ends up tripping an error if =
the compression is not compiled/activated in the code.&nbsp; So you can=92t=
 even peruse/move through a file without tripping an error.</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; /*</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; * An opportunity for compression mode dependent tag fixup</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; */</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; (*tif-&gt;tif_fixuptags)(tif);</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
Our engine specifically watches for errors and assumes it=92s pretty fatal =
=96 when really it=92s kinda benign =96 UNLESS I want to extract the image =
data itself, right??</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
Surely that should be pretty benign to just enumerate through a TIFF =96 ev=
en if you don=92t support the compression of each page??</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
&nbsp;</p>
<p style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri=
, sans-serif;">
Mike</p>
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