Check libpng directly into third_party/

third_party/libpng/scripts/symbols.c

Index: third_party/libpng/scripts/symbols.c
diff --git a/third_party/libpng/scripts/symbols.c b/third_party/libpng/scripts/symbols.c
new file mode 100644
index 0000000000000000000000000000000000000000..28b841d8b6e5661eacc618d002134ea14a5b6b5d
--- /dev/null
+++ b/third_party/libpng/scripts/symbols.c
@@ -0,0 +1,58 @@
+
+/* symbols.c - find all exported symbols
+ *
+ * Last changed in libpng version 1.6.16 [December 22, 2014]
+ * Copyright (c) 2011-2014 Glenn Randers-Pehrson
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* NOTE: making 'symbols.chk' checks both that the exported
+ * symbols in the library don't change and (implicitly) that
+ * scripts/pnglibconf.h.prebuilt is as expected.
+ * If scripts/pnglibconf.h.prebuilt is remade using
+ * scripts/pnglibconf.dfa then this checks the .dfa file too.
+ */
+
+#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
+        PNG_DFN "@" name "@ @@" ordinal "@"
+#define PNG_REMOVED(ordinal, type, name, args, attributes)\
+        PNG_DFN "; @" name "@ @@" ordinal "@"
+#define PNG_EXPORT_LAST_ORDINAL(ordinal)\
+        PNG_DFN "; @@" ordinal "@"
+
+/* Read the defaults, but use scripts/pnglibconf.h.prebuilt; the 'standard'
+ * header file.
+ */
+#include "pnglibconf.h.prebuilt"
+#include "../png.h"
+
+/* Some things are turned off by default.  Turn these things
+ * on here (by hand) to get the APIs they expose and validate
+ * that no harm is done.  This list is the set of options
+ * defaulted to 'off' in scripts/pnglibconf.dfa
+ *
+ * Maintenance: if scripts/pnglibconf.dfa options are changed
+ * from, or to, 'disabled' this needs updating!
+ */
+#define PNG_BENIGN_ERRORS_SUPPORTED
+#define PNG_ERROR_NUMBERS_SUPPORTED
+#define PNG_READ_BIG_ENDIAN_SUPPORTED  /* should do nothing! */
+#define PNG_INCH_CONVERSIONS_SUPPORTED
+#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+#define PNG_SET_OPTION_SUPPORTED
+
+#undef PNG_H
+#include "../png.h"
+
+/* Finally there are a couple of places where option support
+ * actually changes the APIs revealed using a #if/#else/#endif
+ * test in png.h, test these here.
+ */
+#undef  PNG_FLOATING_POINT_SUPPORTED /* Exposes 'fixed' APIs */
+#undef  PNG_ERROR_TEXT_SUPPORTED     /* Exposes unsupported APIs */
+
+#undef PNG_H
+#include "../png.h"