In libpng.txt I read this:
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
defined, and FAR gets defined to far in pngconf.h, and you should be
all set.
And at other places the longjmp is done like this:
#ifdef PNG_SETJMP_SUPPORTED
/* Applications that neglect to set up their own setjmp() and then
encounter
a png_error() will longjmp here. Since the jmpbuf is then
meaningless we
abort instead of returning. */
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
PNG_ABORT();
png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
#else
if (setjmp(png_ptr->jmpbuf))
PNG_ABORT();
#endif
#endif
Could it have something todo with PNG_SETJMP_SUPPORTED or
USE_FAR_KEYWORD?
It's not so straightforward to me how these are defined.
I did not see anything wrong with the setjmp/longjmp at the moment.
JeeBee.
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