png_size_t         75 ext/gd/libgd/gd_png.c static void gdPngReadData (png_structp png_ptr, png_bytep data, png_size_t length)
png_size_t         84 ext/gd/libgd/gd_png.c static void gdPngWriteData (png_structp png_ptr, png_bytep data, png_size_t length)