/** @warning must be called before any I/O */
int ffio_set_buf_size(AVIOContext *s, int buf_size);
+int ffio_limit(AVIOContext *s, int size);
+
void ffio_init_checksum(AVIOContext *s,
unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
unsigned long checksum);