- ssize_t (*read)(void *user_data, void *buffer, size_t length);
- uint32_t (*write)(void *udata, void *buffer, uint32_t length);
- uint32_t (*seek)(void *user_data, uint64_t position);
- uint32_t (*truncate)(void *user_data);
- void *user_data;
+ ssize_t (*read)(void *user_data, void *buffer, size_t length);
+ ssize_t (*write)(void *user_data, void *buffer, size_t count);
+ uint32_t (*seek)(void *user_data, uint64_t position);
+ uint32_t (*truncate)(void *user_data);
+ void *user_data;