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);
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);