png_set_sig_bytes 7808 src/image.c    DEF_DLL_FN (void, png_set_sig_bytes, (png_structp, int));
png_set_sig_bytes 7852 src/image.c      LOAD_DLL_FN (library, png_set_sig_bytes);
png_set_sig_bytes 8157 src/image.c      png_set_sig_bytes (png_ptr, sizeof sig);