/* $NetBSD: dir.c,v 1.19 2006/04/10 03:25:11 dbj Exp $ */ /* * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank * Copyright (c) 1995 Martin Husemann * Some structure declaration borrowed from Paul Popelka * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Martin Husemann * and Wolfgang Solfrank. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #ifndef lint __RCSID("$NetBSD: dir.c,v 1.19 2006/04/10 03:25:11 dbj Exp $"); #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include "ext.h" #include "fsutil.h" #define SLOT_EMPTY 0x00 /* slot has never been used */ #define SLOT_E5 0x05 /* the real value is 0xe5 */ #define SLOT_DELETED 0xe5 /* file in this slot deleted */ #define ATTR_NORMAL 0x00 /* normal file */ #define ATTR_READONLY 0x01 /* file is readonly */ #define ATTR_HIDDEN 0x02 /* file is hidden */ #define ATTR_SYSTEM 0x04 /* file is a system file */ #define ATTR_VOLUME 0x08 /* entry is a volume label */ #define ATTR_DIRECTORY 0x10 /* entry is a directory name */ #define ATTR_ARCHIVE 0x20 /* file is new or modified */ #define ATTR_WIN95 0x0f /* long name record */ /* * This is the format of the contents of the deTime field in the direntry * structure. * We don't use bitfields because we don't know how compilers for * arbitrary machines will lay them out. */ #define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */ #define DT_2SECONDS_SHIFT 0 #define DT_MINUTES_MASK 0x7E0 /* minutes */ #define DT_MINUTES_SHIFT 5 #define DT_HOURS_MASK 0xF800 /* hours */ #define DT_HOURS_SHIFT 11 /* * This is the format of the contents of the deDate field in the direntry * structure. */ #define DD_DAY_MASK 0x1F /* day of month */ #define DD_DAY_SHIFT 0 #define DD_MONTH_MASK 0x1E0 /* month */ #define DD_MONTH_SHIFT 5 #define DD_YEAR_MASK 0xFE00 /* year - 1980 */ #define DD_YEAR_SHIFT 9 /* dir.c */ static struct dosDirEntry *newDosDirEntry(void); static void freeDosDirEntry(struct dosDirEntry *); static struct dirTodoNode *newDirTodo(void); static void freeDirTodo(struct dirTodoNode *); static char *fullpath(struct dosDirEntry *); static u_char calcShortSum(u_char *); static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int, cl_t, int, int); static int removede(int, struct bootblock *, struct fatEntry *, u_char *, u_char *, cl_t, cl_t, cl_t, char *, int); static int checksize(struct bootblock *, struct fatEntry *, u_char *, struct dosDirEntry *); static int readDosDirSection(int, struct bootblock *, struct fatEntry *, struct dosDirEntry *); /* * Manage free dosDirEntry structures. */ static struct dosDirEntry *freede; static struct dosDirEntry * newDosDirEntry(void) { struct dosDirEntry *de; if (!(de = freede)) { if (!(de = (struct dosDirEntry *)malloc(sizeof *de))) return 0; } else freede = de->next; return de; } static void freeDosDirEntry(struct dosDirEntry *de) { de->next = freede; freede = de; } /* * The same for dirTodoNode structures. */ static struct dirTodoNode *freedt; static struct dirTodoNode * newDirTodo(void) { struct dirTodoNode *dt; if (!(dt = freedt)) { if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt))) return 0; } else freedt = dt->next; return dt; } static void freeDirTodo(struct dirTodoNode *dt) { dt->next = freedt; freedt = dt; } /* * The stack of unread directories */ struct dirTodoNode *pendingDirectories = NULL; /* * Return the full pathname for a directory entry. */ static char * fullpath(struct dosDirEntry *dir) { static char namebuf[MAXPATHLEN + 1]; char *cp, *np; int nl; cp = namebuf + sizeof namebuf - 1; *cp = '\0'; do { np = dir->lname[0] ? dir->lname : dir->name; nl = strlen(np); if ((cp -= nl) <= namebuf + 1) break; memcpy(cp, np, nl); *--cp = '/'; } while ((dir = dir->parent) != NULL); if (dir) *--cp = '?'; else cp++; return cp; } /* * Calculate a checksum over an 8.3 alias name */ static u_char calcShortSum(u_char *p) { u_char sum = 0; int i; for (i = 0; i < 11; i++) { sum = (sum << 7)|(sum >> 1); /* rotate right */ sum += p[i]; } return sum; } /* * Global variables temporarily used during a directory scan */ static char longName[DOSLONGNAMELEN] = ""; static u_char *buffer = NULL; static u_char *delbuf = NULL; struct dosDirEntry *rootDir; static struct dosDirEntry *lostDir; /* * Init internal state for a new directory scan. */ int resetDosDirSection(struct bootblock *boot, struct fatEntry *fat) { int b1, b2; cl_t cl; int ret = FSOK; b1 = boot->RootDirEnts * 32; b2 = boot->SecPerClust * boot->BytesPerSec; if (!(buffer = malloc(b1 > b2 ? b1 : b2)) || !(delbuf = malloc(b2)) || !(rootDir = newDosDirEntry())) { perror("No space for directory"); return FSFATAL; } memset(rootDir, 0, sizeof *rootDir); if (boot->flags & FAT32) { if (boot->RootCl < CLUST_FIRST || boot->RootCl >= boot->NumClusters) { pfatal("Root directory starts with cluster out of range(%u)", boot->RootCl); return FSFATAL; } cl = fat[boot->RootCl].next; if (cl < CLUST_FIRST || (cl >= CLUST_RSRVD && cl< CLUST_EOFS) || fat[boot->RootCl].head != boot->RootCl) { if (cl == CLUST_FREE) pwarn("Root directory starts with free cluster\n"); else if (cl >= CLUST_RSRVD) pwarn("Root directory starts with cluster marked %s\n", rsrvdcltype(cl)); else { pfatal("Root directory doesn't start a cluster chain"); return FSFATAL; } if (ask(1, "Fix")) { fat[boot->RootCl].next = CLUST_FREE; ret = FSFATMOD; } else ret = FSFATAL; } fat[boot->RootCl].flags |= FAT_USED; rootDir->head = boot->RootCl; } return ret; } /* * Cleanup after a directory scan */ void finishDosDirSection(void) { struct dirTodoNode *p, *np; struct dosDirEntry *d, *nd; for (p = pendingDirectories; p; p = np) { np = p->next; freeDirTodo(p); } pendingDirectories = 0; for (d = rootDir; d; d = nd) { if ((nd = d->child) != NULL) { d->child = 0; continue; } if (!(nd = d->next)) nd = d->parent; freeDosDirEntry(d); } rootDir = lostDir = NULL; free(buffer); free(delbuf); buffer = NULL; delbuf = NULL; } /* * Delete directory entries between startcl, startoff and endcl, endoff. */ static int delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl, int startoff, cl_t endcl, int endoff, int notlast) { u_char *s, *e; off_t off; int clsz = boot->SecPerClust * boot->BytesPerSec; s = delbuf + startoff; e = delbuf + clsz; while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) { if (startcl == endcl) { if (notlast) break; e = delbuf + endoff; } off = startcl * boot->SecPerClust + boot->ClusterOffset; off *= boot->BytesPerSec; if (lseek(f, off, SEEK_SET) != off || read(f, delbuf, clsz) != clsz) { perror("Unable to read directory"); return FSFATAL; } while (s < e) { *s = SLOT_DELETED; s += 32; } if (lseek(f, off, SEEK_SET) != off || write(f, delbuf, clsz) != clsz) { perror("Unable to write directory"); return FSFATAL; } if (startcl == endcl) break; startcl = fat[startcl].next; s = delbuf; } return FSOK; } static int removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start, u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type) { switch (type) { case 0: pwarn("Invalid long filename entry for %s\n", path); break; case 1: pwarn("Invalid long filename entry at end of directory %s\n", path); break; case 2: pwarn("Invalid long filename entry for volume label\n"); break; } if (ask(0, "Remove")) { if (startcl != curcl) { if (delete(f, boot, fat, startcl, start - buffer, endcl, end - buffer, endcl == curcl) == FSFATAL) return FSFATAL; start = buffer; } /* startcl is < CLUST_FIRST for !fat32 root */ if ((endcl == curcl) || (startcl < CLUST_FIRST)) for (; start < end; start += 32) *start = SLOT_DELETED; return FSDIRMOD; } return FSERROR; } /* * Check an in-memory file entry */ static int checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p, struct dosDirEntry *dir) { /* * Check size on ordinary files */ int32_t physicalSize; if (dir->head == CLUST_FREE) physicalSize = 0; else { if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters) return FSERROR; physicalSize = fat[dir->head].length * boot->ClusterSize; } if (physicalSize < dir->size) { pwarn("size of %s is %u, should at most be %u\n", fullpath(dir), dir->size, physicalSize); if (ask(1, "Truncate")) { dir->size = physicalSize; p[28] = (u_char)physicalSize; p[29] = (u_char)(physicalSize >> 8); p[30] = (u_char)(physicalSize >> 16); p[31] = (u_char)(physicalSize >> 24); return FSDIRMOD; } else return FSERROR; } else if (physicalSize - dir->size >= boot->ClusterSize) { pwarn("%s has too many clusters allocated\n", fullpath(dir)); if (ask(1, "Drop superfluous clusters")) { cl_t cl; u_int32_t sz = 0; for (cl = dir->head; (sz += boot->ClusterSize) < dir->size;) cl = fat[cl].next; clearchain(boot, fat, fat[cl].next); fat[cl].next = CLUST_EOF; return FSFATMOD; } else return FSERROR; } return FSOK; } /* * Read a directory and * - resolve long name records * - enter file and directory records into the parent's list * - push directories onto the todo-stack */ static int readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat, struct dosDirEntry *dir) { struct dosDirEntry dirent, *d; u_char *p, *vallfn, *invlfn, *empty; off_t off; int i, j, k, last; cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0; char *t; u_int lidx = 0; int shortSum; int mod = FSOK; #define THISMOD 0x8000 /* Only used within this routine */ cl = dir->head; if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) { /* * Already handled somewhere else. */ return FSOK; } shortSum = -1; vallfn = invlfn = empty = NULL; do { if (!(boot->flags & FAT32) && !dir->parent) { last = boot->RootDirEnts * 32; off = boot->ResSectors + boot->FATs * boot->FATsecs; } else { last = boot->SecPerClust * boot->BytesPerSec; off = cl * boot->SecPerClust + boot->ClusterOffset; } off *= boot->BytesPerSec; if (lseek(f, off, SEEK_SET) != off || read(f, buffer, last) != last) { perror("Unable to read directory"); return FSFATAL; } last /= 32; /* * Check `.' and `..' entries here? XXX */ for (p = buffer, i = 0; i < last; i++, p += 32) { if (dir->fsckflags & DIREMPWARN) { *p = SLOT_EMPTY; continue; } if (*p == SLOT_EMPTY || *p == SLOT_DELETED) { if (*p == SLOT_EMPTY) { dir->fsckflags |= DIREMPTY; empty = p; empcl = cl; } continue; } if (dir->fsckflags & DIREMPTY) { if (!(dir->fsckflags & DIREMPWARN)) { pwarn("%s has entries after end of directory\n", fullpath(dir)); if (ask(1, "Extend")) { u_char *q; dir->fsckflags &= ~DIREMPTY; if (delete(f, boot, fat, empcl, empty - buffer, cl, p - buffer, 1) == FSFATAL) return FSFATAL; q = empcl == cl ? empty : buffer; assert(q != NULL); for (; q < p; q += 32) *q = SLOT_DELETED; mod |= THISMOD|FSDIRMOD; } else if (ask(0, "Truncate")) dir->fsckflags |= DIREMPWARN; } if (dir->fsckflags & DIREMPWARN) { *p = SLOT_DELETED; mod |= THISMOD|FSDIRMOD; continue; } else if (dir->fsckflags & DIREMPTY) mod |= FSERROR; empty = NULL; } if (p[11] == ATTR_WIN95) { if (*p & LRFIRST) { if (shortSum != -1) { if (!invlfn) { invlfn = vallfn; invcl = valcl; } } memset(longName, 0, sizeof longName); shortSum = p[13]; vallfn = p; valcl = cl; } else if (shortSum != p[13] || lidx != (*p & LRNOMASK)) { if (!invlfn) { invlfn = vallfn; invcl = valcl; } if (!invlfn) { invlfn = p; invcl = cl; } vallfn = NULL; } lidx = *p & LRNOMASK; t = longName + --lidx * 13; for (k = 1; k < 11 && t < longName + sizeof(longName); k += 2) { if (!p[k] && !p[k + 1]) break; *t++ = p[k]; /* * Warn about those unusable chars in msdosfs here? XXX */ if (p[k + 1]) t[-1] = '?'; } if (k >= 11) for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) { if (!p[k] && !p[k + 1]) break; *t++ = p[k]; if (p[k + 1]) t[-1] = '?'; } if (k >= 26) for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) { if (!p[k] && !p[k + 1]) break; *t++ = p[k]; if (p[k + 1]) t[-1] = '?'; } if (t >= longName + sizeof(longName)) { pwarn("long filename too long\n"); if (!invlfn) { invlfn = vallfn; invcl = valcl; } vallfn = NULL; } if (p[26] | (p[27] << 8)) { pwarn("long filename record cluster start != 0\n"); if (!invlfn) { invlfn = vallfn; invcl = cl; } vallfn = NULL; } continue; /* long records don't carry further * information */ } /* * This is a standard msdosfs directory entry. */ memset(&dirent, 0, sizeof dirent); /* * it's a short name record, but we need to know * more, so get the flags first. */ dirent.flags = p[11]; /* * Translate from 850 to ISO here XXX */ for (j = 0; j < 8; j++) dirent.name[j] = p[j]; dirent.name[8] = '\0'; for (k = 7; k >= 0 && dirent.name[k] == ' '; k--) dirent.name[k] = '\0'; if (dirent.name[k] != '\0') k++; if (dirent.name[0] == SLOT_E5) dirent.name[0] = 0xe5; if (dirent.flags & ATTR_VOLUME) { if (vallfn || invlfn) { mod |= removede(f, boot, fat, invlfn ? invlfn : vallfn, p, invlfn ? invcl : valcl, -1, 0, fullpath(dir), 2); vallfn = NULL; invlfn = NULL; } continue; } if (p[8] != ' ') dirent.name[k++] = '.'; for (j = 0; j < 3; j++) dirent.name[k++] = p[j+8]; dirent.name[k] = '\0'; for (k--; k >= 0 && dirent.name[k] == ' '; k--) dirent.name[k] = '\0'; if (vallfn && shortSum != calcShortSum(p)) { if (!invlfn) { invlfn = vallfn; invcl = valcl; } vallfn = NULL; } dirent.head = p[26] | (p[27] << 8); if (boot->ClustMask == CLUST32_MASK) dirent.head |= (p[20] << 16) | (p[21] << 24); dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24); if (vallfn) { strlcpy(dirent.lname, longName, sizeof(dirent.lname)); longName[0] = '\0'; shortSum = -1; } dirent.parent = dir; dirent.next = dir->child; if (invlfn) { mod |= k = removede(f, boot, fat, invlfn, vallfn ? vallfn : p, invcl, vallfn ? valcl : cl, cl, fullpath(&dirent), 0); if (mod & FSFATAL) return FSFATAL; if (vallfn ? (valcl == cl && vallfn != buffer) : p != buffer) if (k & FSDIRMOD) mod |= THISMOD; } vallfn = NULL; /* not used any longer */ invlfn = NULL; if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) { if (dirent.head != 0) { pwarn("%s has clusters, but size 0\n", fullpath(&dirent)); if (ask(1, "Drop allocated clusters")) { p[26] = p[27] = 0; if (boot->ClustMask == CLUST32_MASK) p[20] = p[21] = 0; clearchain(boot, fat, dirent.head); dirent.head = 0; mod |= THISMOD|FSDIRMOD|FSFATMOD; } else mod |= FSERROR; } } else if (dirent.head == 0 && !strcmp(dirent.name, "..") && dir->parent /* XXX */ && !dir->parent->parent) { /* * Do nothing, the parent is the root */ } else if (dirent.head < CLUST_FIRST || dirent.head >= boot->NumClusters || fat[dirent.head].next == CLUST_FREE || (fat[dirent.head].next >= CLUST_RSRVD && fat[dirent.head].next < CLUST_EOFS) || fat[dirent.head].head != dirent.head) { if (dirent.head == 0) pwarn("%s has no clusters\n", fullpath(&dirent)); else if (dirent.head < CLUST_FIRST || dirent.head >= boot->NumClusters) pwarn("%s starts with cluster out of range(%u)\n", fullpath(&dirent), dirent.head); else if (fat[dirent.head].next == CLUST_FREE) pwarn("%s starts with free cluster\n", fullpath(&dirent)); else if (fat[dirent.head].next >= CLUST_RSRVD) pwarn("%s starts with cluster marked %s\n", fullpath(&dirent), rsrvdcltype(fat[dirent.head].next)); else pwarn("%s doesn't start a cluster chain\n", fullpath(&dirent)); if (dirent.flags & ATTR_DIRECTORY) { if (ask(0, "Remove")) { *p = SLOT_DELETED; mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; continue; } else { if (ask(1, "Truncate")) { p[28] = p[29] = p[30] = p[31] = 0; p[26] = p[27] = 0; if (boot->ClustMask == CLUST32_MASK) p[20] = p[21] = 0; dirent.size = 0; mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; } } if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters) fat[dirent.head].flags |= FAT_USED; if (dirent.flags & ATTR_DIRECTORY) { /* * gather more info for directories */ struct dirTodoNode *n; if (dirent.size) { pwarn("Directory %s has size != 0\n", fullpath(&dirent)); if (ask(1, "Correct")) { p[28] = p[29] = p[30] = p[31] = 0; dirent.size = 0; mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; } /* * handle `.' and `..' specially */ if (strcmp(dirent.name, ".") == 0) { if (dirent.head != dir->head) { pwarn("`.' entry in %s has incorrect start cluster\n", fullpath(dir)); if (ask(1, "Correct")) { dirent.head = dir->head; p[26] = (u_char)dirent.head; p[27] = (u_char)(dirent.head >> 8); if (boot->ClustMask == CLUST32_MASK) { p[20] = (u_char)(dirent.head >> 16); p[21] = (u_char)(dirent.head >> 24); } mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; } continue; } if (strcmp(dirent.name, "..") == 0) { if (dir->parent) { /* XXX */ if (!dir->parent->parent) { if (dirent.head) { pwarn("`..' entry in %s has non-zero start cluster\n", fullpath(dir)); if (ask(1, "Correct")) { dirent.head = 0; p[26] = p[27] = 0; if (boot->ClustMask == CLUST32_MASK) p[20] = p[21] = 0; mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; } } else if (dirent.head != dir->parent->head) { pwarn("`..' entry in %s has incorrect start cluster\n", fullpath(dir)); if (ask(1, "Correct")) { dirent.head = dir->parent->head; p[26] = (u_char)dirent.head; p[27] = (u_char)(dirent.head >> 8); if (boot->ClustMask == CLUST32_MASK) { p[20] = (u_char)(dirent.head >> 16); p[21] = (u_char)(dirent.head >> 24); } mod |= THISMOD|FSDIRMOD; } else mod |= FSERROR; } } continue; } /* create directory tree node */ if (!(d = newDosDirEntry())) { perror("No space for directory"); return FSFATAL; } memcpy(d, &dirent, sizeof(struct dosDirEntry)); /* link it into the tree */ dir->child = d; /* Enter this directory into the todo list */ if (!(n = newDirTodo())) { perror("No space for todo list"); return FSFATAL; } n->next = pendingDirectories; n->dir = d; pendingDirectories = n; } else { mod |= k = checksize(boot, fat, p, &dirent); if (k & FSDIRMOD) mod |= THISMOD; } boot->NumFiles++; } if (!(boot->flags & FAT32) && !dir->parent) break; if (mod & THISMOD) { last *= 32; if (lseek(f, off, SEEK_SET) != off || write(f, buffer, last) != last) { perror("Unable to write directory"); return FSFATAL; } mod &= ~THISMOD; } } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters); if (invlfn || vallfn) mod |= removede(f, boot, fat, invlfn ? invlfn : vallfn, p, invlfn ? invcl : valcl, -1, 0, fullpath(dir), 1); /* The root directory of non fat32 filesystems is in a special * area and may have been modified above without being written out. */ if ((mod & FSDIRMOD) && !(boot->flags & FAT32) && !dir->parent) { last *= 32; if (lseek(f, off, SEEK_SET) != off || write(f, buffer, last) != last) { perror("Unable to write directory"); return FSFATAL; } mod &= ~THISMOD; } return mod & ~THISMOD; } int handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat) { int mod; mod = readDosDirSection(dosfs, boot, fat, rootDir); if (mod & FSFATAL) return FSFATAL; /* * process the directory todo list */ while (pendingDirectories) { struct dosDirEntry *dir = pendingDirectories->dir; struct dirTodoNode *n = pendingDirectories->next; /* * remove TODO entry now, the list might change during * directory reads */ freeDirTodo(pendingDirectories); pendingDirectories = n; /* * handle subdirectory */ mod |= readDosDirSection(dosfs, boot, fat, dir); if (mod & FSFATAL) return FSFATAL; } return mod; } /* * Try to reconnect a FAT chain into dir */ static u_char *lfbuf; static cl_t lfcl; static off_t lfoff; int reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head) { struct dosDirEntry d; u_char *p; if (!ask(1, "Reconnect")) return FSERROR; if (!lostDir) { for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) { if (!strcmp(lostDir->name, LOSTDIR)) break; } if (!lostDir) { /* Create LOSTDIR? XXX */ pwarn("No %s directory\n", LOSTDIR); return FSERROR; } } if (!lfbuf) { lfbuf = malloc(boot->ClusterSize); if (!lfbuf) { perror("No space for buffer"); return FSFATAL; } p = NULL; } else p = lfbuf; while (1) { if (p) for (; p < lfbuf + boot->ClusterSize; p += 32) if (*p == SLOT_EMPTY || *p == SLOT_DELETED) break; if (p && p < lfbuf + boot->ClusterSize) break; lfcl = p ? fat[lfcl].next : lostDir->head; if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) { /* Extend LOSTDIR? XXX */ pwarn("No space in %s\n", LOSTDIR); return FSERROR; } lfoff = lfcl * boot->ClusterSize + boot->ClusterOffset * boot->BytesPerSec; if (lseek(dosfs, lfoff, SEEK_SET) != lfoff || read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) { perror("could not read LOST.DIR"); return FSFATAL; } p = lfbuf; } boot->NumFiles++; /* Ensure uniqueness of entry here! XXX */ memset(&d, 0, sizeof d); (void)snprintf(d.name, sizeof(d.name), "%u", head); d.flags = 0; d.head = head; d.size = fat[head].length * boot->ClusterSize; memset(p, 0, 32); memset(p, ' ', 11); memcpy(p, d.name, strlen(d.name)); p[26] = (u_char)d.head; p[27] = (u_char)(d.head >> 8); if (boot->ClustMask == CLUST32_MASK) { p[20] = (u_char)(d.head >> 16); p[21] = (u_char)(d.head >> 24); } p[28] = (u_char)d.size; p[29] = (u_char)(d.size >> 8); p[30] = (u_char)(d.size >> 16); p[31] = (u_char)(d.size >> 24); fat[head].flags |= FAT_USED; if (lseek(dosfs, lfoff, SEEK_SET) != lfoff || write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) { perror("could not write LOST.DIR"); return FSFATAL; } return FSDIRMOD; } void finishlf(void) { if (lfbuf) free(lfbuf); lfbuf = NULL; }