- use png_sig_cmp to support libpng 1.4, old is deprecated already in older version

diff --git a/ext/gd/libgd/gd_png.c b/ext/gd/libgd/gd_png.c
index 6eff1b1dbe6678510d54c196169c6e3db8bac39c..7959883c04b53dc30afe7487d61beee7589083d4 100644 (file)
--- a/ext/gd/libgd/gd_png.c
+++ b/ext/gd/libgd/gd_png.c
@@ -145,7 +145,7 @@ gdImagePtr gdImageCreateFromPngCtx (gdIOCtx * infile)
                return NULL;
        }
 
-       if (!png_check_sig (sig, 8)) { /* bad signature */
+       if (png_sig_cmp(sig, 0, 8) != 0) { /* bad signature */
                return NULL;
        }