phatdir.c

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00001 /*
00002  * Copyright (C) 2005-2006 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  */
00032 
00101 #include <fs/fs.h>
00102 #include <fs/phatfs.h>
00103 #include <fs/phatvol.h>
00104 #include <fs/phatio.h>
00105 #include <fs/phatutil.h>
00106 #include <fs/phatdir.h>
00107 
00108 #include <stdlib.h>
00109 #include <string.h>
00110 #include <ctype.h>
00111 #include <fcntl.h>
00112 #include <errno.h>
00113 #include <time.h>
00114 
00115 #if 0
00116 /* Use for local debugging. */
00117 #define NUTDEBUG
00118 #include <stdio.h>
00119 #include <fs/phatdbg.h>
00120 #endif
00121 
00126 
00128 #define PHAT_MAXDIRENT   65536
00129 
00136 static INLINE uint8_t GenShortNameChecksum(char *sfn)
00137 {
00138     uint8_t rc = 0;
00139     int i;
00140 
00141     for (i = 0; i < 11; i++) {
00142         rc = ((rc >> 1) | ((rc & 1) << 7)) + (uint8_t)(sfn[i]);
00143     }
00144     return rc;
00145 }
00146 
00158 static int GenShortName(NUTFILE * ndp, CONST char *lfn, char *sfn)
00159 {
00160     int rc = -1;
00161     int i;
00162     int got;
00163     PHATDIRENT *entry;
00164     char *xp;
00165 
00166     /* Fill the buffer with spaces. */
00167     memset(sfn, ' ', 11);
00168 
00169     /* Get the position of the last dot in the long name. */
00170     xp = strrchr(lfn, '.');
00171 
00172     /* Now collect up to 8 characters for the basename and 3 characters
00173      * for the extension. */
00174     for (i = 0; i < 11 && *lfn; lfn++) {
00175         if (*lfn == '.') {
00176             /* We reached the first dot. The basename ends here. */
00177             if (lfn == xp) {
00178                 /* This is also the last dot. Start copying the extension. */
00179                 lfn++;
00180                 if (*lfn) {
00181                     sfn[8] = toupper(*lfn);
00182                 }
00183                 i = 9;
00184             }
00185         }
00186         else if (i == 8) {
00187             /* First 8 characters collected. */
00188             if (xp == NULL) {
00189                 /* No dot, no extension. */
00190                 break;
00191             }
00192             lfn = xp + 1;
00193             if (*lfn) {
00194                 sfn[i++] = toupper(*lfn);
00195             }
00196         }
00197         else if (*lfn != ' ') {
00198             if (strrchr("+,;=[]", *lfn)) {
00199                 sfn[i++] = '_';
00200             }
00201             else {
00202                 sfn[i++] = toupper(*lfn);
00203             }
00204         }
00205     }
00206 
00207     /*
00208      * Select a unique short name by verifying existing entries in the 
00209      * specified directory.
00210      */
00211     if ((entry = malloc(sizeof(PHATDIRENT))) != NULL) {
00212         xp = sfn;
00213         for (i = 0; i < 6 && *xp != ' '; i++) {
00214             xp++;
00215         }
00216         /*
00217          * We try up to 99 unique short names only, but this should be
00218          * sufficient for our tiny system - hopefully.
00219          */
00220         for (i = 1; i <= 99 && rc; i++) {
00221             if (i == 10) {
00222                 xp--;
00223             }
00224             *xp = '~';
00225             if (i > 9) {
00226                 *(xp + 1) = '0' + i / 10;
00227                 *(xp + 2) = '0' + i % 10;
00228             }
00229             else {
00230                 *(xp + 1) = '0' + i;
00231             }
00232             PhatFilePosRewind((PHATFILE *)ndp->nf_fcb);
00233             for (;;) {
00234                 /* Read next entry. */
00235                 if ((got = PhatFileRead(ndp, entry, sizeof(PHATDIRENT))) != sizeof(PHATDIRENT)) {
00236                     if (got) {
00237                         /* Read error, stop searching. */
00238                         i = 9;
00239                     }
00240                     else {
00241                         /* End of directory reached, entry is unique. */
00242                         rc = 0;
00243                     }
00244                     break;
00245                 }
00246                 if ((entry->dent_attr & PHAT_FATTR_VOLID) == 0) {
00247                     if (entry->dent_name[0] == 0) {
00248                         /* End of directory reached, entry is unique. */
00249                         rc = 0;
00250                         break;
00251                     }
00252                     if (memcmp(sfn, (char *)entry->dent_name, 11) == 0) {
00253                         /* Entry exists, try next one. */
00254                         break;
00255                     }
00256                 }
00257             }
00258         }
00259         free(entry);
00260     }
00261     return rc;
00262 }
00263 
00273 static int PhatDirEntryAlloc(NUTFILE * ndp, CONST char *fname, PHATDIRENT * entry)
00274 {
00275     int rc;
00276     int pos = 0;
00277     int got;
00278     uint8_t sect;
00279     uint8_t *temp;
00280     NUTDEVICE *dev = ndp->nf_dev;
00281     PHATFILE *dfcb = ndp->nf_fcb;
00282     PHATVOL *vol = (PHATVOL *) dev->dev_dcb;
00283     PHATDIRENT *dent;
00284     PHATXDIRENT *xdent;
00285     int nwant = 1;
00286     int ngot = 0;
00287     int npos = 0;
00288     int i;
00289     int ci;
00290     uint8_t cks = 0;
00291 
00292     /* Convert the dotted name to a space filled one. */
00293     if ((rc = MakePhatName(fname, entry->dent_name)) == 1) {
00294         /* Reject name with wildcards. */
00295         errno = EINVAL;
00296         return -1;
00297     }
00298     if (rc == 0) {
00299         char vname[16];
00300 
00301         MakeVisibleName(entry->dent_name, vname);
00302         if (strcmp(fname, vname)) {
00303             rc = 1;
00304         }
00305     }
00306     if (rc) {
00307         if (GenShortName(ndp, fname, (char *)entry->dent_name)) {
00308             errno = EINVAL;
00309             return -1;
00310         }
00311         nwant = (strlen(fname) + 12) / 13 + 1;
00312         cks = GenShortNameChecksum((char *)entry->dent_name);
00313     }
00314 
00315     /* Allocate a temporary entry buffer. */
00316     if ((dent = malloc(sizeof(PHATDIRENT))) == NULL) {
00317         return -1;
00318     }
00319 
00320     /*
00321      * Find free entries, starting from the beginning.
00322      */
00323     PhatFilePosRewind(dfcb);
00324     rc = -1;
00325     for (;;) {
00326         /* Memorize the current position and try to read the next entry. */
00327         npos = dfcb->f_pos;
00328         if ((got = PhatFileRead(ndp, dent, sizeof(PHATDIRENT))) < 0) {
00329             /* Read failed. */
00330             break;
00331         }
00332         if (got != sizeof(PHATDIRENT)) {
00333             /*
00334              * End of directory reached. Try to expand it. 
00335              */
00336             if (IsFixedRootDir(ndp) ||  /* */
00337                 dfcb->f_pos >= PHAT_MAXDIRENT * sizeof(PHATDIRENT)) {
00338                 /* Failed. Either PHAT12/16 root dir or max. size reached. */
00339                 errno = EFBIG;
00340                 break;
00341             }
00342 
00343             /* Fill a new cluster with zeros. */
00344             if ((temp = malloc(vol->vol_sectsz)) == NULL) {
00345                 break;
00346             }
00347             memset(temp, 0, vol->vol_sectsz);
00348             for (sect = vol->vol_clustsz; sect; sect--) {
00349                 if (PhatFileWrite(ndp, temp, vol->vol_sectsz) < 0) {
00350                     /* Write failed. */
00351                     break;
00352                 }
00353             }
00354             free(temp);
00355             /* End of directory reached and expanded by a new cluster. */
00356             if (sect == 0) {
00357                 if (ngot == 0) {
00358                     pos = npos;
00359                 }
00360                 rc = 0;
00361             }
00362             break;
00363         }
00364         if (dent->dent_name[0] == PHAT_REM_DIRENT || dent->dent_name[0] == 0) {
00365             /* Empty entry found. */
00366             if (ngot == 0) {
00367                 pos = npos;
00368             }
00369             ngot++;
00370             if (ngot >= nwant) {
00371                 rc = 0;
00372                 break;
00373             }
00374         }
00375         else {
00376             ngot = 0;
00377         }
00378     }
00379     free(dent);
00380 
00381     if (rc == 0) {
00382         /* Return to the memorized position and write the new entry. */
00383         PhatFilePosSet(ndp, pos);
00384         if ((xdent = malloc(sizeof(PHATXDIRENT))) == NULL) {
00385             return -1;
00386         }
00387         for (ngot = nwant - 1; ngot; ngot--) {
00388             memset(xdent, 0xFF, sizeof(PHATXDIRENT));
00389             xdent->xdent_seq = ngot;
00390             if (ngot == nwant - 1) {
00391                 xdent->xdent_seq |= 0x40;
00392             }
00393             xdent->xdent_attr = PHAT_FATTR_LFN;
00394             xdent->xdent_cks = cks;
00395             xdent->xdent_clust = 0;
00396             xdent->xdent_rsvd = 0;
00397             /* Simplified unicode conversion, ignores double byte characters. */
00398             ci = (ngot - 1) * 13;
00399             for (i = 0; i < 13; i++) {
00400                 if (ci + i <= strlen(fname)) {
00401                     if (i < 5) {
00402                         xdent->xdent_uname_1_5[i] = fname[ci + i];
00403                     }
00404                     else if (i < 11) {
00405                         xdent->xdent_uname_6_11[i - 5] = fname[ci + i];
00406                     }
00407                     else {
00408                         xdent->xdent_uname_12_13[i - 11] = fname[ci + i];
00409                     }
00410                 }
00411             }
00412             if (PhatFileWrite(ndp, xdent, sizeof(PHATXDIRENT)) < 0) {
00413                 /* Write error. */
00414                 rc = -1;
00415                 break;
00416             }
00417         }
00418         if (PhatFileWrite(ndp, entry, sizeof(PHATDIRENT)) < 0) {
00419             /* Write error. */
00420             rc = -1;
00421         }
00422         free(xdent);
00423     }
00424     return rc;
00425 }
00426 
00439 static int PhatDirEntryRelease(NUTFILE * ndp, uint32_t pos, int lfncnt)
00440 {
00441     uint8_t ch = PHAT_REM_DIRENT;
00442     int i;
00443 
00444     for (i = lfncnt; i; i--) {
00445         PhatFilePosSet(ndp, pos - i * sizeof(PHATXDIRENT));
00446         if (PhatFileWrite(ndp, &ch, 1) < 0) {
00447             return -1;
00448         }
00449     }
00450     PhatFilePosSet(ndp, pos);
00451     if (PhatFileWrite(ndp, &ch, 1) < 0) {
00452         return -1;
00453     }
00454     return 0;
00455 }
00456 
00467 int PhatDirEntryCreate(NUTFILE * ndp, CONST char *name, int acc, PHATDIRENT * dirent)
00468 {
00469     dirent->dent_attr = (uint8_t) acc;
00470     GetDosTimeStamp(&dirent->dent_ctime, &dirent->dent_cdate);
00471     dirent->dent_adate = dirent->dent_cdate;
00472     dirent->dent_mtime = dirent->dent_ctime;
00473     dirent->dent_mdate = dirent->dent_cdate;
00474 
00475     if (PhatDirEntryAlloc(ndp, name, dirent)) {
00476         return -1;
00477     }
00478 #ifdef NUTDEBUG
00479     PhatDbgFileInfo(stdout, "New Dir Entry", ndp->nf_fcb);
00480 #endif
00481     return 0;
00482 }
00483 
00491 int PhatDirEntryUpdate(NUTFILE * nfp)
00492 {
00493     int sbn;
00494     NUTDEVICE *dev = nfp->nf_dev;
00495     PHATVOL *vol = (PHATVOL *) dev->dev_dcb;
00496     PHATFILE *fcb = nfp->nf_fcb;
00497 
00498     if (fcb->f_de_dirty) {
00499         /*
00500          * The file may specify the root directory, in which case
00501          * the updated is skipped.
00502          */
00503         if (fcb->f_de_sect) {
00504 #ifdef NUTDEBUG
00505             PhatDbgDirEntry(stdout, "PhatDirEntryUpdate", &fcb->f_dirent);
00506 #endif
00507             if ((sbn = PhatSectorLoad(dev, fcb->f_de_sect)) < 0) {
00508                 return -1;
00509             }
00510             memcpy(vol->vol_buf[sbn].sect_data + fcb->f_de_offs, &fcb->f_dirent, sizeof(PHATDIRENT));
00511             vol->vol_buf[sbn].sect_dirty = 1;
00512         }
00513         fcb->f_de_dirty = 0;
00514     }
00515     return 0;
00516 }
00517 
00526 static int PhatDirEntryRead(NUTFILE * ndp, PHATFIND * srch)
00527 {
00528     PHATDIRENT *entry = &srch->phfind_ent;
00529     PHATFILE *fcb = ndp->nf_fcb;
00530     PHATXDIRENT *xentry;
00531     char *lfn = NULL;
00532     int lfnpos = 0;
00533     int nxtseq = 0;
00534     int lfncnt = 0;
00535     int i;
00536 
00537     for (;;) {
00538         /* Read next entry. */
00539         if (PhatFileRead(ndp, entry, sizeof(PHATDIRENT)) != sizeof(PHATDIRENT)) {
00540             break;
00541         }
00542         /* Skip removed entries. */
00543         if (entry->dent_name[0] == PHAT_REM_DIRENT) {
00544             if (lfn) {
00545                 free(lfn);
00546                 lfn = NULL;
00547             }
00548         }
00549         /* Process long filename entries. */
00550         else if (entry->dent_attr == PHAT_FATTR_LFN) {
00551             xentry = (PHATXDIRENT *)entry;
00552             lfnpos = (xentry->xdent_seq & 0x3F);
00553             /* Make sure we are in sequence. */
00554             if ((nxtseq == 0 && (xentry->xdent_seq & 0x40) != 0) || nxtseq == lfnpos) {
00555                 nxtseq = --lfnpos;
00556                 lfnpos *= 13;
00557                 if (lfnpos + 13 > PHAT_MAX_NAMELEN) {
00558                     errno = EINVAL;
00559                     break;
00560                 }
00561                 if (xentry->xdent_seq & 0x40) {
00562                     if (lfn == NULL) {
00563                         lfn = malloc(PHAT_MAX_NAMELEN + 1);
00564                     }
00565                     lfn[lfnpos + 13] = 0;
00566                     lfncnt = 0;
00567                 }
00568                 lfncnt++;
00569                 /* Simplified unicode conversion, ignores double byte characters. */
00570                 for (i = 0; i < 5; i++) {
00571                     lfn[lfnpos + i] = (char)xentry->xdent_uname_1_5[i];
00572                 }
00573                 for (i = 0; i < 6; i++) {
00574                     lfn[lfnpos + 5 + i] = (char)xentry->xdent_uname_6_11[i];
00575                 }
00576                 for (i = 0; i < 2; i++) {
00577                     lfn[lfnpos + 11 + i] = (char)xentry->xdent_uname_12_13[i];
00578                 }
00579             }
00580         }
00581 
00582         /* Skip volume IDs. */
00583         else if ((entry->dent_attr & PHAT_FATTR_VOLID) == 0) {
00584             /* Stop searching if last entry reached. */
00585             if (entry->dent_name[0] == 0) {
00586                 break;
00587             }
00588             /* Valid entry found. Return success. */
00589             srch->phfind_pos = fcb->f_pos - sizeof(PHATDIRENT);
00590             if (lfn && lfnpos == 0) {
00591                 strcpy(srch->phfind_name, lfn);
00592                 srch->phfind_xcnt = lfncnt;
00593             }
00594             else {
00595                 MakeVisibleName(entry->dent_name, srch->phfind_name);
00596                 srch->phfind_xcnt = 0;
00597             }
00598             if (lfn) {
00599                 free(lfn);
00600             }
00601             nxtseq = 0;
00602             lfncnt = 0;
00603             return 0;
00604         }
00605         else if (lfn) {
00606             free(lfn);
00607             lfn = NULL;
00608             nxtseq = 0;
00609             lfncnt = 0;
00610         }
00611     }
00612     if (lfn) {
00613         free(lfn);
00614     }
00615     return -1;
00616 }
00617 
00630 int PhatDirEntryFind(NUTFILE * ndp, CONST char *spec, uint32_t attmsk, PHATFIND * srch)
00631 {
00632     int rc;
00633     PHATFIND *temps;
00634 
00635     /* Allocate a temporary structure to store the search result. */
00636     if ((temps = malloc(sizeof(PHATFIND))) == NULL) {
00637         return -1;
00638     }
00639 
00640     /*
00641      * Loop until the specified entry was found or until we reach the
00642      * end of the directory.
00643      */
00644     PhatFilePosRewind((PHATFILE *)ndp->nf_fcb);
00645     while ((rc = PhatDirEntryRead(ndp, temps)) == 0) {
00646         if ((temps->phfind_ent.dent_attr | attmsk) == attmsk) {
00647             if (strcasecmp(temps->phfind_name, spec) == 0) {
00648                 /* Specified entry found. */
00649                 if (srch) {
00650                     *srch = *temps;
00651                 }
00652                 break;
00653             }
00654         }
00655     }
00656     free(temps);
00657 
00658     return rc;
00659 }
00660 
00671 NUTFILE *PhatDirOpenParent(NUTDEVICE * dev, CONST char *path, CONST char **basename)
00672 {
00673     NUTFILE *rc = NUTFILE_EOF;
00674     char *parent;
00675 
00676     if ((parent = GetParentPath(path, basename)) != NULL) {
00677         rc = PhatDirOpen(dev, parent);
00678         free(parent);
00679     }
00680     return rc;
00681 }
00682 
00692 int PhatDirRenameEntry(NUTDEVICE * dev, CONST char *old_path, CONST char *new_path)
00693 {
00694     int rc = -1;
00695     CONST char *fname;
00696     NUTFILE *old_ndp;
00697     NUTFILE *new_ndp;
00698     PHATFIND *srch;
00699 
00700     /*
00701      * Open directory of the old file.
00702      */
00703     if ((old_ndp = PhatDirOpenParent(dev, old_path, &fname)) == NUTFILE_EOF) {
00704         return -1;
00705     }
00706 
00707     if ((srch = malloc(sizeof(PHATFIND))) != NULL) {
00708         if ((rc = PhatDirEntryFind(old_ndp, fname, PHAT_FATTR_FILEMASK, srch)) == 0) {
00709             rc = -1;
00710             if ((new_ndp = PhatDirOpenParent(dev, new_path, &fname)) != NUTFILE_EOF) {
00711                 if (PhatDirEntryFind(new_ndp, fname, PHAT_FATTR_FILEMASK, NULL) == 0) {
00712                     errno = EEXIST;
00713                 } else {
00714                     if ((rc = PhatDirEntryAlloc(new_ndp, fname, &srch->phfind_ent)) == 0) {
00715                         rc = PhatDirEntryRelease(old_ndp, srch->phfind_pos, srch->phfind_xcnt);
00716                     }
00717                 }
00718                 PhatFileClose(new_ndp);
00719             }
00720         }
00721         else {
00722             errno = ENOENT;
00723         }
00724         free(srch);
00725     }
00726     PhatFileClose(old_ndp);
00727 
00728     return rc;
00729 }
00730 
00739 int PhatDirReleaseChain(NUTDEVICE * dev, PHATDIRENT *dent)
00740 {
00741     int rc = 0;
00742     PHATVOL *vol = (PHATVOL *) dev->dev_dcb;
00743     uint32_t clust;
00744 
00745     /* Do not remove clusters of files with RDONLY attribute. */
00746     if (dent->dent_attr & PHAT_FATTR_RDONLY) {
00747         errno = EACCES;
00748         return -1;
00749     }
00750 
00751     /* Get the first cluster of this file. The directory entry stores this
00752        value in two positions. */
00753     clust = dent->dent_clusthi;
00754     clust <<= 16;
00755     clust |= dent->dent_clust;
00756 
00757     /* The data area starts at cluster 2. With empty files the first cluster 
00758        is set to zero. A value of one is suspicious and will be ignored. */
00759     if (clust >= 2) {
00760         /* Call the format specific release routine. */
00761         if (vol->vol_type == 32) {
00762             rc = Phat32ReleaseChain(dev, clust);
00763         } else if (vol->vol_type == 16) {
00764             rc = Phat16ReleaseChain(dev, clust);
00765         } else {
00766             rc = Phat12ReleaseChain(dev, clust);
00767         }
00768     }
00769     return rc;
00770 }
00771 
00783 int PhatDirDelEntry(NUTDEVICE * dev, CONST char *path, uint32_t flags)
00784 {
00785     int rc = -1;
00786     PHATFIND *srch;
00787     NUTFILE *ndp;
00788     CONST char *fname;
00789 
00790     /* Open the parent directory. */
00791     if ((ndp = PhatDirOpenParent(dev, path, &fname)) != NUTFILE_EOF) {
00792         if ((srch = malloc(sizeof(PHATFIND))) != NULL) {
00793             /* Find the specified file name. */
00794             if (PhatDirEntryFind(ndp, fname, flags, srch) == 0) {
00795                 if (PhatDirReleaseChain(dev, &srch->phfind_ent) == 0) {
00796                     rc = PhatDirEntryRelease(ndp, srch->phfind_pos, srch->phfind_xcnt);
00797                 }
00798             }
00799             else {
00800                 errno = ENOENT;
00801             }
00802             free(srch);
00803         }
00804         PhatFileClose(ndp);
00805     }
00806     return rc;
00807 }
00808 
00817 NUTFILE *PhatDirOpen(NUTDEVICE * dev, CONST char *dpath)
00818 {
00819     NUTFILE *ndp;
00820     PHATFILE *dfcb;
00821     PHATFIND *srch;
00822     char *comp;
00823     char *cp;
00824     int sz;
00825     PHATVOL *vol = (PHATVOL *) dev->dev_dcb;
00826 
00827     /* Make sure the volume is mounted. */
00828     if (vol == NULL) {
00829         errno = ENODEV;
00830         return NUTFILE_EOF;
00831     }
00832 
00833     /* Allocate the structure to return. */
00834     if ((ndp = malloc(sizeof(NUTFILE))) == NULL) {
00835         return NUTFILE_EOF;
00836     }
00837     if ((ndp->nf_fcb = malloc(sizeof(PHATFILE))) == NULL) {
00838         free(ndp);
00839         return NUTFILE_EOF;
00840     }
00841     memset(ndp->nf_fcb, 0, sizeof(PHATFILE));
00842     ndp->nf_next = NULL;
00843     ndp->nf_dev = dev;
00844 
00845     dfcb = ndp->nf_fcb;
00846     dfcb->f_dirent.dent_attr = PHAT_FATTR_DIR;
00847     dfcb->f_mode = _O_RDONLY;
00848 
00849     /* We start at the root directory. */
00850     dfcb->f_clust = vol->vol_root_clust;
00851     dfcb->f_dirent.dent_clusthi = (uint16_t) (vol->vol_root_clust >> 16);
00852     dfcb->f_dirent.dent_clust = (uint16_t) vol->vol_root_clust;
00853 
00854     if (*dpath == '/') {
00855         dpath++;
00856     }
00857     if (*dpath) {
00858         /*
00859          * We are looking for a subdirectory.
00860          */
00861         if ((comp = malloc(PHAT_MAX_NAMELEN + 1)) == NULL) {
00862             free(dfcb);
00863             free(ndp);
00864             return NUTFILE_EOF;
00865         }
00866         if ((srch = malloc(sizeof(PHATFIND))) == NULL) {
00867             free(comp);
00868             free(dfcb);
00869             free(ndp);
00870             return NUTFILE_EOF;
00871         }
00872 
00873         /*
00874          * Walk down the path.
00875          */
00876         while (*dpath) {
00877             /* Fetch the next component from the path. */
00878             cp = comp;
00879             sz = 0;
00880             while (*dpath) {
00881                 if (*dpath == '/') {
00882                     dpath++;
00883                     break;
00884                 }
00885                 if (++sz > PHAT_MAX_NAMELEN) {
00886                     break;
00887                 }
00888                 *cp++ = *dpath++;
00889             }
00890             *cp = 0;
00891 
00892             /* Search component's entry in the current directory. */
00893             if (sz > PHAT_MAX_NAMELEN || PhatDirEntryFind(ndp, comp, PHAT_FATTR_FILEMASK, srch)) {
00894                 errno = ENOENT;
00895                 free(dfcb);
00896                 free(ndp);
00897                 ndp = NUTFILE_EOF;
00898                 break;
00899             }
00900 
00901             /*
00902              * Next component found. Mimic the open by updating the existing
00903              * file control block structure.
00904              */
00905             dfcb->f_de_sect = PhatClusterSector(ndp, dfcb->f_clust) + dfcb->f_clust_pos;
00906             dfcb->f_de_offs = dfcb->f_sect_pos - 32;
00907 
00908             /* Set the cluster of our directory entry. */
00909             dfcb->f_pde_clusthi = dfcb->f_dirent.dent_clusthi;
00910             dfcb->f_pde_clust = dfcb->f_dirent.dent_clust;
00911 
00912             dfcb->f_dirent = srch->phfind_ent;
00913 #ifdef NUTDEBUG
00914             PhatDbgFileInfo(stdout, "Component", dfcb);
00915 #endif
00916 
00917             /*
00918              * Handle root directory.
00919              */
00920             if (dfcb->f_dirent.dent_attr & PHAT_FATTR_DIR) {
00921                 if (dfcb->f_dirent.dent_clust == 0 && dfcb->f_dirent.dent_clusthi == 0) {
00922                     if (vol->vol_type != 32) {
00923                         dfcb->f_de_sect = 0;
00924                     }
00925                     dfcb->f_dirent.dent_clusthi = (uint16_t) (vol->vol_root_clust >> 16);
00926                     dfcb->f_dirent.dent_clust = (uint16_t) vol->vol_root_clust;
00927                 }
00928             }
00929 
00930             /*
00931              * Reset position.
00932              */
00933             PhatFilePosRewind(dfcb);
00934             dfcb->f_clust_prv = 0;
00935             dfcb->f_mode = _O_RDONLY;
00936         }
00937         free(srch);
00938         free(comp);
00939     }
00940     return ndp;
00941 }
00942 
00950 int PhatDirRead(DIR * dir)
00951 {
00952     PHATFIND *srch;
00953     struct dirent *ent;
00954 
00955     if ((srch = malloc(sizeof(PHATFIND))) == NULL) {
00956         return -1;
00957     }
00958     if (PhatDirEntryRead(dir->dd_fd, srch)) {
00959         free(srch);
00960         return -1;
00961     }
00962 #ifdef NUTDEBUG
00963     PhatDbgDirEntry(stdout, "Read entry", &srch->phfind_ent);
00964 #endif
00965 
00966     ent = (struct dirent *) dir->dd_buf;
00967     memset(dir->dd_buf, 0, sizeof(struct dirent));
00968     ent->d_namlen = (uint8_t) strlen(srch->phfind_name);
00969     strcpy(ent->d_name, srch->phfind_name);
00970     if (srch->phfind_ent.dent_attr & PHAT_FATTR_DIR) {
00971         ent->d_type = 1;
00972     }
00973     free(srch);
00974 
00975     return 0;
00976 }
00977 
00989 int PhatDirCreate(NUTDEVICE * dev, char *path)
00990 {
00991     NUTFILE *ndp;
00992     PHATVOL *vol = (PHATVOL *) dev->dev_dcb;
00993     PHATFILE *dfcb;
00994     PHATDIRENT *entry;
00995     uint8_t *buf;
00996     uint32_t sect;
00997     uint32_t clust;
00998 
00999     /*
01000      * Create the new directory like a normal file with a special attribute.
01001      */
01002     if ((ndp = PhatFileOpen(dev, path, _O_CREAT | _O_RDWR | _O_EXCL, PHAT_FATTR_DIR)) == NUTFILE_EOF) {
01003         return -1;
01004     }
01005     dfcb = ndp->nf_fcb;
01006 
01007     /*
01008      * Allocate a first cluster and initialize it with zeros.
01009      */
01010     if ((clust = AllocFirstCluster(ndp)) < 2) {
01011         PhatFileClose(ndp);
01012         return -1;
01013     }
01014     dfcb->f_clust_prv = clust;
01015     dfcb->f_clust = clust;
01016     if ((buf = malloc(vol->vol_sectsz)) == NULL) {
01017         PhatFileClose(ndp);
01018         return -1;
01019     }
01020     memset(buf, 0, vol->vol_sectsz);
01021     for (sect = vol->vol_clustsz; sect; sect--) {
01022         if (PhatFileWrite(ndp, buf, vol->vol_sectsz) < 0) {
01023             /* Write failed. */
01024             free(buf);
01025             PhatFileClose(ndp);
01026             return -1;
01027         }
01028     }
01029     free(buf);
01030 
01031     /*
01032      * Write the dot entry.
01033      */
01034     entry = malloc(sizeof(PHATDIRENT));
01035     *entry = dfcb->f_dirent;
01036     memset(entry->dent_name, ' ', sizeof(entry->dent_name));
01037     entry->dent_name[0] = '.';
01038     PhatFilePosRewind(dfcb);
01039     if (PhatFileWrite(ndp, entry, sizeof(PHATDIRENT)) != sizeof(PHATDIRENT)) {
01040         PhatFileClose(ndp);
01041         free(entry);
01042         return -1;
01043     }
01044 
01045     /*
01046      * Write the double dot entry. If it points to the root cluster,
01047      * then the cluster number in the directory entry must be zero.
01048      */
01049     if ((uint16_t) vol->vol_root_clust == dfcb->f_pde_clust &&   /* */
01050         vol->vol_root_clust >> 16 == dfcb->f_pde_clusthi) {
01051         entry->dent_clust = 0;
01052         entry->dent_clusthi = 0;
01053     } else {
01054         entry->dent_clust = dfcb->f_pde_clust;
01055         entry->dent_clusthi = dfcb->f_pde_clusthi;
01056     }
01057     entry->dent_name[1] = '.';
01058     if (PhatFileWrite(ndp, entry, sizeof(PHATDIRENT)) != sizeof(PHATDIRENT)) {
01059         PhatFileClose(ndp);
01060         free(entry);
01061         return -1;
01062     }
01063     free(entry);
01064 
01065     return PhatFileClose(ndp);
01066 }
01067 
01076 int PhatDirRemove(NUTDEVICE * dev, char *path)
01077 {
01078     int rc = -1;
01079     PHATDIRENT *entry;
01080     NUTFILE *ndp;
01081 
01082     /* Never remove the root directory */
01083     if (path[0] == '/' && path[1] == 0) {
01084         errno = EBUSY;
01085         return -1;
01086     }
01087 
01088     if ((entry = malloc(sizeof(PHATDIRENT))) == NULL) {
01089         return -1;
01090     }
01091 
01092     /*
01093      * Make sure, that the directory we want to remove is empty. The dot 
01094      * and double dot entries are ignored.
01095      */
01096     if ((ndp = PhatFileOpen(dev, path, _O_RDONLY, 0)) != NUTFILE_EOF) {
01097         rc = 0;
01098         for (;;) {
01099             rc = PhatFileRead(ndp, entry, sizeof(PHATDIRENT));
01100             if (rc < 0) {
01101                 break;
01102             }
01103             /* Check for end of directory. */
01104             if (rc < sizeof(PHATDIRENT) || entry->dent_name[0] == 0) {
01105                 rc = 0;
01106                 break;
01107             }
01108             /* Skip removed entries. */
01109             if (entry->dent_name[0] == PHAT_REM_DIRENT) {
01110                 continue;
01111             }
01112             /* Ignore entries which are not files. */
01113             if ((entry->dent_attr | PHAT_FATTR_FILEMASK) != PHAT_FATTR_FILEMASK) {
01114                 continue;
01115             }
01116             /* Ignore dot and double dot entries. */
01117             if (entry->dent_name[0] == '.' &&   /* */
01118                 (entry->dent_name[1] == '.' || entry->dent_name[1] == ' ')) {
01119                 if (memcmp("         ", &entry->dent_name[2], 9) == 0) {
01120                     continue;
01121                 }
01122             }
01123             errno = ENOTEMPTY;
01124             rc = -1;
01125             break;
01126         }
01127         PhatFileClose(ndp);
01128     }
01129     free(entry);
01130 
01131     /* If the empty check was successful, then remove the entry. */
01132     if (rc == 0) {
01133         rc = PhatDirDelEntry(dev, path, PHAT_FATTR_DIR);
01134     }
01135     return rc;
01136 }
01137 
01147 int PhatDirEntryStatus(NUTDEVICE * dev, CONST char *path, struct stat *stp)
01148 {
01149     int rc;
01150     CONST char *fname;
01151     NUTFILE *ndp;
01152     PHATFIND *srch;
01153     u_int val;
01154 
01155     /* Open parent directory. */
01156     if ((ndp = PhatDirOpenParent(dev, path, &fname)) == NUTFILE_EOF) {
01157         return -1;
01158     }
01159 
01160     if ((srch = malloc(sizeof(PHATFIND))) == NULL) {
01161         PhatFileClose(ndp);
01162         return -1;
01163     }
01164     if ((rc = PhatDirEntryFind(ndp, fname, PHAT_FATTR_FILEMASK, srch)) == 0) {
01165         struct _tm t;
01166 
01167         memset(&t, 0, sizeof(struct _tm));
01168         val = srch->phfind_ent.dent_mtime;
01169         t.tm_sec = (val & 0x1F) << 1;
01170         t.tm_min = (val >> 5) & 0x3F;
01171         t.tm_hour = (val >> 11) & 0x1F;
01172         val = srch->phfind_ent.dent_mdate;
01173         t.tm_mday = val & 0x1F;
01174         t.tm_mon = ((val >> 5) & 0x0F);
01175         if (t.tm_mon) {
01176             t.tm_mon--;
01177         }
01178         t.tm_year = ((val >> 9) & 0x7F) + 80;
01179         t.tm_isdst = _daylight; 
01180         stp->st_mtime = mktime(&t);
01181 
01182         stp->st_ino = 0;
01183         stp->st_mode = (srch->phfind_ent.dent_attr & PHAT_FATTR_DIR) != 0;
01184         stp->st_nlink = 0;
01185         stp->st_size = srch->phfind_ent.dent_fsize;
01186     }
01187     free(srch);
01188     PhatFileClose(ndp);
01189 
01190     return rc;
01191 }
01192 

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