Imported from libpng-1.0.1e.tar
diff --git a/pngwio.c b/pngwio.c
index 917c38f..f1826dd 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,12 +1,11 @@
/* pngwio.c - functions for data output
*
- * libpng 1.0.1d
+ * libpng 1.0.1e - June 6, 1998
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
- * May 21, 1998
*
* This file provides a location for all output. Users who need
* special handling are expected to write functions that have the same
@@ -175,7 +174,14 @@
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* It is an error to read while writing a png file */
- png_ptr->read_data_fn = NULL;
+ if (png_ptr->read_data_fn != NULL)
+ {
+ png_ptr->read_data_fn = NULL;
+ png_warning(png_ptr,
+ "Attempted to set both read_data_fn and write_data_fn in");
+ png_warning(png_ptr,
+ "the same structure. Resetting read_data_fn to NULL.");
+ }
}
#if defined(USE_FAR_KEYWORD)