png_handle_as_unknown  928 png.c             return png_handle_as_unknown(png_ptr, chunk_string);
png_handle_as_unknown 2433 png.h          PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr,
png_handle_as_unknown   42 pngwrite.c              int keep = png_handle_as_unknown(png_ptr, up->name);