To: Sulau <sulau@freenet.de>
Date: Tue, 2 May 2023 21:01:00
Subject: Re: [Tiff] [EXTERNAL] Re: Specific image fails with error at
 TIFFWriteRawStrip function(26659675)
From: Ganesh Bondili [mailto:Ganesh.Bondili@kofax.com]

Hi Su,

 

I have modified sample as you have given by adding mandatory tags. I have
attached complete sample in the below link. I could not see error at
"TIFFReadRawStrip ()" but TIFFWriteRawStrip()'  results in error "Maximum
TIFF file size exceeded". 'TIFFWriteEncodedStrip()' throws error "Fractional
scanlines cannot be written". How these errors can be resolved.

 

https://drive.google.com/file/d/1JGPBGCkYAdRFUfUAa2K2DSF_H8e3Hvxn/view?usp=s
hare_link

 

I have also tested with ImageMagick with customer 'Test.Tiff' & our own G3
(CCITT T.4) sample attached '3pg_small.tif'. ImageMagick Convert.exe has
resulted in error as below with Customer Sample 'Test.Tiff' but not with our
G3 (CCITT T.4) sample '3pg_small.tif' as shown below. Why ImageMagick throws
error ": Buffer overflow at line 2253" for customer sample only. Why
conversion works with our G3 (CCITT T.4) sample but not with the sample from
the customer 'Test.Tiff'.

 

ImageMagick Convert.exe execution -

 

C:\Program Files (x86)\ImageMagick>convert test.tiff tt1.pdf

convert: Buffer overflow at line 2253 of strip 0. `Fax3Decode1D' @
error/tiff.c/TIFFErrors/600.

 

C:\Program Files (x86)\ImageMagick64>convert 3pg_small.tif TT2.pdf

No error. Successful conversion.

 

Regards,

Ganesh.

Ganesh Bondili
Principal Software Engineer



Kofax India Private Limited
V IT Park, Capella Building, Floor 6, Plot No. 17, Software Units Layout
Hyderabad, Madhapur 500081
India

Tel: +91 40 45459949
Fax: +91 40 45459922
Ganesh.Bondili@kofax.com <mailto:Ganesh.Bondili@kofax.com> 

  

. 

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From: Sulau <sulau@freenet.de <mailto:sulau@freenet.de> > 
Sent: Friday, April 21, 2023 7:32 PM
To: Ganesh Bondili <Ganesh.Bondili@kofax.com
<mailto:Ganesh.Bondili@kofax.com> >
Cc: tiff@lists.osgeo.org <mailto:tiff@lists.osgeo.org> 
Subject: AW: [Tiff] [EXTERNAL] Re: Specific image fails with error at
TIFFWriteRawStrip function(26659675)

 

Hi Ganesh

 

With the testfile LibTIFFCrsh1.cpp I get the error message:
"TIFFWriteRawStrip: Must set "ImageWidth" before writing data."

 

That is, you can't just create a default TIFF directory (out =
TIFFOpen(sInputSinglePage.c_str(), "w");) and then write image data to that
directory without first setting up the mandatory tags accordingly.

 

Finally, you have to write the TIFF directory to the file. This is done by
TIFFClose().

You should also close the input file at the end.

 

Finally, the input image data are "Group3Fax" compressed. That means the
function TIFFReadRawStrip() reads nonsense. You need to read with
TIFFReadEncodedStrip().

 

You should read the TIFF documentation at:
http://www.simplesystems.org/libtiff/index.html  

and get familiar with copying of data using as example:
https://gitlab.com/libtiff/libtiff/-/blob/master/tools/tiffcp.c . I would
suggest taking tiffcp.c in the debugger and debug how your file is copied
there.

 

Another example, how to write a simple TIFF image is given in
https://gitlab.com/libtiff/libtiff/-/blob/master/test/custom_dir.c line 63
to 128.

 

Regards

Su

 

Von: Tiff [mailto:tiff-bounces@lists.osgeo.org] Im Auftrag von Ganesh
Bondili via Tiff
Gesendet: Mittwoch, 19. April 2023 20:11
An: Bob Friesenhahn <bfriesen@simple.dallas.tx.us
<mailto:bfriesen@simple.dallas.tx.us> >
Cc: 'tiff@lists.osgeo.org' <tiff@lists.osgeo.org
<mailto:tiff@lists.osgeo.org> >
Betreff: Re: [Tiff] [EXTERNAL] Re: Specific image fails with error at
TIFFWriteRawStrip function(26659675)

 

Thank you Bob for the information. Does this mean the TIFF internal data is
Huge size for example 4GB or more. But the file Test.TIFF itself is just 370
KB.

Hi LibTIFF team, Are there any other replies suggesting root-cause for this
Test.TIFF error. Is the Test.TIFF is as per TIFF standard. Are there any
other problems with this input TIFF or solution to successfully copy/write
strips individually to TIFF files. Why is the size of single strip is
returned as such a huge size(IS any field has wrong data). Will 64 bit of
LibTIFF binaries will resolve this issue is some way.

Regards,
Ganesh.
