2017.05.26 17:42 "Re: [Tiff] Sporadic crash on Windows when appending images to TIFF file", by Dinesh Iyer

Thanks Bob. I will give this a shot as part of upgrading to 4.0.8

On Fri, May 26, 2017 at 11:42 AM, Bob Friesenhahn < bfriesen@simple.dallas.tx.us> wrote:

which is generated when the call to CreateFileW in tif_win32.c fails? Again this failure happens sporadically.

I added a guard in my code to retry opening the file if an error occurs with a pause 0.1 seconds between retries (max 5 retries) and the errors seemed to have gone away.

This might be a Windows file handling issue.

There are two possible I/O implementations available under Windows. The implementations are tif_win32.c and tif_unix.c in the libtiff subdirectory. Either of these may be used and you can switch your build to use tif_unix.c rather than tif_win32.c.

There is a known issue with tif_win32.c in that libtiff only preserves the lower 32-bits (or maybe 31 bits) of the Windows file handle so if the handle requires more bits, then there would be a failure.

In recent libtiff 4.0.X I would expect tif_unix.c to function as well as tif_win32.c, and in some cases better. I am not sure if unicode filenames are supported with tif_unix.c though.