+int open_conv_to_internal(const char* fromcode);
+void close_conv_to_internal();
+char* to_internal(const char* str, size_t len, struct conv_buffer *output_buf);
+void set_encoding_width(Encoding enc);
+void set_encoding_bom(Enc_bom bom);
+void set_encoding_terminator(char* term);
+