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February 2010
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2010.02.08 17:03 "Re: Libtiff and UTF-8 filename support", by Bob Friesenhahn
On Mon, 8 Feb 2010, Graeme Gill wrote: > I was looking though the libtiff V4.0.0beta5 sources, and noticed > that there is probably a discrepancy between the behavior of > Libtiff between MSWindows and Unix like platforms with regard > to filename encoding. > > On Unix like systems (tif_unix.c) TIFFOpen calls the open() > with a possibly UTF-8 filename, while in tif_win32.c it calls > CreateFileA(), which doesn't take a UTF-8 argument. Many Unix systems are character-set agnostic. File names are just binary blobs supporting null termination. Some Unix filesystems do support an indication of allowed character sets. If a filesytem is set to a specific encoding, it may reject certain file names since they are not compatible with the encoding. It is also possible that a stored filename won't match a freshly provided one, which varies only by some factor that the OS normally ignores (e.g. case). > Wouldn't it be better to make TIFFOpen support UTF-8 > on both Unix and MSWindows, by making tif_win32.c do > a MultiByteToWideChar() and then use CreateFileW() ? > (or would this create problems in code that expects > there to be differences between the platforms ?) This seems like a good option to support, but there may be side-effects such as inability to compare two file names, or inability to store a file name. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/