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Defined in avio.h

typedef struct {
    unsigned char *buffer;
    int buffer_size;
    unsigned char *buf_ptr, *buf_end;
    void *opaque;
    int (*read_packet)(void *opaque, uint8_t *buf, int buf_size);
    int (*write_packet)(void *opaque, uint8_t *buf, int buf_size);
    offset_t (*seek)(void *opaque, offset_t offset, int whence);
    offset_t pos; /**< position in the file of the current buffer */
    int must_flush; /**< true if the next seek should flush */
    int eof_reached; /**< true if eof reached */
    int write_flag;  /**< true if open for writing */
    int is_streamed;
    int max_packet_size;
    unsigned long checksum;
    unsigned char *checksum_ptr;
    unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
    int error;         ///< contains the error code or 0 if no error happened
} ByteIOContext;

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