2019.06.20 12:43 "Re: [Tiff] TIFFFdOpen crash on Windows 64bit", by Bob Friesenhahn

When I try to use TIFFFdOpen on Windows 10 64bit - but it crash. In

attachment there is my testing code. I found this problem when I was

testing poppler[1] utility pdftoppm (to convert pdf to tif).

IMO this is relevant to Bug 1941 - Win64 problem with tif_win32.c's

TIFFOpen() use of HANDLE (w/patch)[3],

I should point out that it is possible to use tif_unix.c under Windows as well. It appears that your code assumes use of tif_win32.c. It may well be that tif_unix.c was used in the libtiff build. I see that the Autoconf configure script offers the option --disable-win32-io to disable use of Windows I/O but it is possible that it might also be disabled by a test (e.g. if it thought that the host_os is Cygwin).

Regardless, usually one should check for errors at each step, which your code does not do.

It is safer to use TIFFClientOpen(), but then I/O wrapper functions need to be supplied, and this can take a few tries to implement perfectly.

Bob
--
Bob Friesenhahn
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GraphicsMagick Maintainer, http://www.GraphicsMagick.org/

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