ref: 6bb619c8db2867ddd9cd19c0aec05065f5ee0cae
dir: /libnandfs/readpage.c/
#include "logfsos.h" #include "logfs.h" #include "nandfs.h" #include "nandecc.h" #include "local.h" char * nandfsreadpage(Nandfs *nandfs, void *buf, NandfsTags *tags, long block, int page, int reportbad, LogfsLowLevelReadResult *result) { ulong ecc1, ecc2, storedecc1, storedecc2; NandEccError e1, e2; ulong rawoffset; NandfsAuxiliary hdr; char *errmsg; rawoffset = nandfs->rawblocksize * (nandfs->baseblock + block) + NandfsFullSize * page; errmsg = (*nandfs->read)(nandfs->magic, buf, NandfsPageSize, rawoffset); if (errmsg) return errmsg; errmsg = (*nandfs->read)(nandfs->magic, &hdr, sizeof(hdr), rawoffset + NandfsPageSize); if (errmsg) return errmsg; ecc1 = nandecc(buf); ecc2 = nandecc((uchar *)buf + 256); storedecc1 = getlittle3(hdr.ecc1); storedecc2 = getlittle3(hdr.ecc2); e1 = nandecccorrect(buf, ecc1, &storedecc1, reportbad); e2 = nandecccorrect((uchar *)buf + 256, ecc2, &storedecc2, reportbad); if (e1 == NandEccErrorBad || e2 == NandEccErrorBad) *result = LogfsLowLevelReadResultHardError; else if (e1 != NandEccErrorGood || e2 != NandEccErrorGood) *result = LogfsLowLevelReadResultSoftError; else *result = LogfsLowLevelReadResultOk; if (tags) { *result = _nandfscorrectauxiliary(&hdr); _nandfsextracttags(&hdr, tags); } return nil; } char * nandfsreadpagerange(Nandfs *nandfs, void *buf, long block, int page, int offset, int count, LogfsLowLevelReadResult *result) { char *errmsg; uchar tmpbuf[NandfsPageSize]; errmsg = nandfsreadpage(nandfs, tmpbuf, nil, block, page, 1, result); if (errmsg == nil) memmove(buf, tmpbuf + offset, count); return errmsg; }