[devel] Make the 'png_jmpbuf' macro expand to a call that records the correct
longjmp function as well as returning a pointer to the setjmp
jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
(John Bowler)
diff --git a/pngerror.c b/pngerror.c
index 3c9c72d..d7efd603 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
- * Last changed in libpng 1.4.0 [November 20, 2009]
+ * Last changed in libpng 1.4.0 [November 21, 2009]
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -229,6 +229,21 @@
#endif
#endif /* PNG_READ_SUPPORTED */
+#ifdef PNG_SETJMP_SUPPORTED
+/* This API only exists if ANSI-C style error handling is used, otherwise
+ * it is necessary for png_default_error to be overridden.
+ */
+jmp_buf* PNGAPI
+png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)
+{
+ if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf))
+ return NULL;
+
+ png_ptr->longjmp_fn = longjmp_fn;
+ return &png_ptr->jmpbuf;
+}
+#endif
+
/* This is the default error handling function. Note that replacements for
* this function MUST NOT RETURN, or the program will likely crash. This
* function is used by default, or if the program supplies NULL for the
@@ -273,16 +288,16 @@
#endif
#ifdef PNG_SETJMP_SUPPORTED
- if (png_ptr)
+ if (png_ptr && png_ptr->longjmp_fn)
{
# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
- longjmp(jmpbuf, 1);
+ png_ptr->longjmp_fn(jmpbuf, 1);
}
# else
- longjmp(png_ptr->jmpbuf, 1);
+ png_ptr->longjmp_fn(png_ptr->jmpbuf, 1);
# endif
}
#endif
