int odr_grow_block(odr_ecblock *b, int min_bytes);
int odr_write(ODR o, unsigned char *buf, int bytes);
int odr_seek(ODR o, int whence, int offset);
int odr_grow_block(odr_ecblock *b, int min_bytes);
int odr_write(ODR o, unsigned char *buf, int bytes);
int odr_seek(ODR o, int whence, int offset);