int sqfs_read(const char *filename, void *buf, loff_t offset,
loff_t len, loff_t *actread);
int sqfs_size(const char *filename, loff_t *size);
int sqfs_read(const char *filename, void *buf, loff_t offset,
loff_t len, loff_t *actread);
int sqfs_size(const char *filename, loff_t *size);