Imported from libpng-0.85.tar
diff --git a/pngerror.c b/pngerror.c
new file mode 100644
index 0000000..1ea2221
--- /dev/null
+++ b/pngerror.c
@@ -0,0 +1,99 @@
+
+/* pngerror.c - stub functions for i/o and memory allocation
+
+ libpng 1.0 beta 2 - version 0.85
+ For conditions of distribution and use, see copyright notice in png.h
+ Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
+ December 19, 1995
+
+ This file provides a location for all error handling. Users which
+ need special error handling are expected to modify the code in this
+ file to meet their needs. See the instructions at each function. */
+
+#define PNG_INTERNAL
+#include "png.h"
+
+/* This function is called whenever there is an error. Replace with
+ however you wish to handle the error. Note that this function
+ MUST NOT return, or the program will crash */
+void
+png_error(png_structp png_ptr, png_const_charp message)
+{
+ if (png_ptr->error_fn)
+ (*(png_ptr->error_fn))(png_ptr, message);
+
+ /* if the following returns or doesn't exist, use the default function,
+ which will not return */
+ png_default_error(png_ptr, message);
+}
+
+void
+png_warning(png_structp png_ptr, png_const_charp message)
+{
+ if (png_ptr->warning_fn)
+ (*(png_ptr->warning_fn))(png_ptr, message);
+ else
+ png_default_warning(png_ptr, message);
+}
+
+void
+png_default_error(png_structp png_ptr, png_const_charp message)
+{
+#ifndef PNG_NO_STDIO
+ fprintf(stderr, "libpng error: %s\n", message);
+#endif
+
+#ifdef USE_FAR_KEYWORD
+ {
+ jmp_buf jmpbuf;
+ png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
+ longjmp(jmpbuf, 1);
+ }
+#else
+ longjmp(png_ptr->jmpbuf, 1);
+#endif
+}
+
+/* This function is called when there is a warning, but the library
+ thinks it can continue anyway. You don't have to do anything here
+ if you don't want to. In the default configuration, png_ptr is
+ not used, but it is passed in case it may be useful. */
+
+void
+png_default_warning(png_structp png_ptr, png_const_charp message)
+{
+ if (!png_ptr)
+ return;
+
+#ifndef PNG_NO_STDIO
+ fprintf(stderr, "libpng warning: %s\n", message);
+#endif
+}
+
+/* This function is called when the application wants to use another
+ method of handling errors and warnings. Note that the error function must
+ NOT return to the calling routine or serious problems will occur. The
+ error return method used in the default routine calls
+ longjmp(png_ptr->jmpbuf, 1) */
+void
+png_set_message_fn(png_structp png_ptr, png_voidp msg_ptr, png_msg_ptr error_fn,
+ png_msg_ptr warning_fn)
+{
+ png_ptr->msg_ptr = msg_ptr;
+
+ png_ptr->error_fn = error_fn;
+ png_ptr->warning_fn = warning_fn;
+}
+
+
+/* This function returns a pointer to the msg_ptr associated with the user
+ functions. The application should free any memory associated with this
+ pointer before png_write_destroy and png_read_destroy are called. */
+png_voidp
+png_get_msg_ptr(png_structp png_ptr)
+{
+ return png_ptr->msg_ptr;
+}
+
+
+
