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December 2007

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2007.12.12 16:20 "JPEGLib: Warning, Application transferred too many scanlines", by Andreas Degert

Hi List,

I'm struggling with libtiff and jpeg compression. When I convert a big
PPM-File to TIFF with

ppm2tiff -c jpeg test.ppm test.tiff

and then try to convert it to PDF with

tiff2pdf -n test.tiff -o test.pdf

I get errors:

JPEGLib: Warning, Application transferred too many scanlines.
tiff2pdf: Error on decoding strip 0 of test.tiff.
tiff2pdf: An error occurred in converting TIFF test.tiff to PDF test.pdf.

(with no valid PDF file created)

This is with libtiff V 3.8.2 (Debian libtiff4). I compiled libtiff V4
alpha and tiff2pdf with -n seems to work but not without -n (illegal
memory access).

In tools/tiff2pdf.c near line 2270 max_striplength is computed from
TIFFTAG_STRIPBYTECOUNTS, and then TIFFReadRawStrip() is called which
gets the strip size from the tiff header, which seems to be bigger. Why
are 2 different methods used? This might also be a security issue.
For the moment I just doubled the computed size of max_striplength and
it seems to work, but maybe someone can shed a light on the 2 different
methods of getting the strip length and we can find the real fix.

thanks
Andreas