-int fat_size(const char *filename);
-long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
- unsigned long maxsize);
-long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
+int fat_size(const char *filename, loff_t *size);
+int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
+ loff_t maxsize, loff_t *actread);
+int file_fat_read(const char *filename, void *buffer, int maxsize);