[NTG-pdftex] writepng problem?

Hartmut Henkel hartmut_henkel at gmx.de
Sun Oct 31 11:35:26 CET 2004

here it seems that pdftex currently crashes on Willem van Schaik PNG
test files

basn4a08.png 8 bit grayscale + 8 bit alpha-channel
basn4a16.png 16 bit grayscale + 16 bit alpha-channel
basn6a08.png 3x8 bits rgb color + 8 bit alpha-channel
basn6a16.png 3x16 bits rgb color + 16 bit alpha-channel
bgan6a08.png 3x8 bits rgb color, alpha, no background chunk
bgan6a16.png 3x16 bits rgb color, alpha, no background chunk
bgbn4a08.png 8 bit grayscale, alpha, black background chunk
bggn4a16.png 16 bit grayscale, alpha, gray background chunk
bgwn6a08.png 3x8 bits rgb color, alpha, white background chunk
bgyn6a16.png 3x16 bits rgb color, alpha, yellow background chunk

and this seems to be due to something in the new libpng 1.2.7. Looks
like the allocated row buffer is overrun by 32 bytes. Happens only with
alpha channel, the png-implement list 10/04 has something about

Regards, Hartmut

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