typedef struct NandfsBlockData NandfsBlockData;typedef struct NandfsAuxiliary NandfsAuxiliary; struct NandfsBlockData {	ulong path;	short tag;	ulong nerase;	int partial;}; struct Nandfs {	LogfsLowLevel ll;	char *(*read)(void*, void*, long, ulong);	char *(*write)(void*, void*, long, ulong);	char *(*erase)(void*, long blockaddr);	char *(*sync)(void*);	void *magic;	long rawblocksize;	long baseblock;	long limitblock;	NandfsBlockData *blockdata;	int trace;	int worseblocks;	int printbad;}; struct NandfsAuxiliary {	uchar parth[4];		// ggpppppp pppppppp pppppppp pp1hhhhh (bigendian) self-protected	uchar tag;			// self-protecting	uchar blockstatus;	// self-protecting	uchar nerasemagicmsw[2];	// see nerasemagiclsw	uchar ecc2[3];		// self-protecting	uchar nerasemagiclsw[2];	// mmmmmm mmeeeeee eeeeeeeeee ee1hhhhh (bigendian) self-protected	uchar ecc1[3];		// self-protecting}; #define getbig2(p) (((p)[0] << 8) | (p)[1])#define getbig4(p) (((p)[0] << 24) | ((p)[1] << 16) | ((p)[2] << 8) | (p)[3])#define getlittle3(p) (((p)[2] << 16) | ((p)[1] << 8) | (p)[0])#define putlittle3(p, q) ((p)[0] = (q), (p)[1] = (q) >> 8, (p)[2] = (q) >> 16)#define putbig2(p, q) ((p)[0] = (q) >> 8, (p)[1] = (q))#define putbig4(p, q) ((p)[0] = (q) >> 24, (p)[1] = (q) >> 16, (p)[2] = (q) >> 8, (p)[3] = (q)) LogfsLowLevelReadResult _nandfscorrectauxiliary(NandfsAuxiliary*); extern uchar _nandfsvalidtags[];extern int _nandfsvalidtagscount; ulong _nandfshamming31_26calc(ulong in);int _nandfshamming31_26correct(ulong *in); void _nandfsextracttags(NandfsAuxiliary*, NandfsTags*); extern char Enomem[], Eperm[], Eio[];