1015 lines
25 KiB
C
1015 lines
25 KiB
C
/*
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* Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
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* Copyright (c) 1995 Martin Husemann
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* Some structure declaration borrowed from Paul Popelka
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* (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: dir.c,v 1.20 2006/06/05 16:51:18 christos Exp $");
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/param.h>
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#include "ext.h"
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#include "fsutil.h"
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#define SLOT_EMPTY 0x00 /* slot has never been used */
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#define SLOT_E5 0x05 /* the real value is 0xe5 */
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#define SLOT_DELETED 0xe5 /* file in this slot deleted */
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#define ATTR_NORMAL 0x00 /* normal file */
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#define ATTR_READONLY 0x01 /* file is readonly */
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#define ATTR_HIDDEN 0x02 /* file is hidden */
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#define ATTR_SYSTEM 0x04 /* file is a system file */
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#define ATTR_VOLUME 0x08 /* entry is a volume label */
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#define ATTR_DIRECTORY 0x10 /* entry is a directory name */
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#define ATTR_ARCHIVE 0x20 /* file is new or modified */
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#define ATTR_WIN95 0x0f /* long name record */
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/*
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* This is the format of the contents of the deTime field in the direntry
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* structure.
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* We don't use bitfields because we don't know how compilers for
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* arbitrary machines will lay them out.
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*/
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#define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
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#define DT_2SECONDS_SHIFT 0
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#define DT_MINUTES_MASK 0x7E0 /* minutes */
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#define DT_MINUTES_SHIFT 5
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#define DT_HOURS_MASK 0xF800 /* hours */
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#define DT_HOURS_SHIFT 11
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/*
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* This is the format of the contents of the deDate field in the direntry
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* structure.
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*/
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#define DD_DAY_MASK 0x1F /* day of month */
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#define DD_DAY_SHIFT 0
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#define DD_MONTH_MASK 0x1E0 /* month */
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#define DD_MONTH_SHIFT 5
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#define DD_YEAR_MASK 0xFE00 /* year - 1980 */
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#define DD_YEAR_SHIFT 9
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/* dir.c */
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static struct dosDirEntry *newDosDirEntry(void);
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static void freeDosDirEntry(struct dosDirEntry *);
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static struct dirTodoNode *newDirTodo(void);
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static void freeDirTodo(struct dirTodoNode *);
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static char *fullpath(struct dosDirEntry *);
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static u_char calcShortSum(u_char *);
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static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
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cl_t, int, int);
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static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
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u_char *, cl_t, cl_t, cl_t, char *, int);
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static int checksize(struct bootblock *, struct fatEntry *, u_char *,
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struct dosDirEntry *);
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static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
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struct dosDirEntry *);
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/*
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* Manage free dosDirEntry structures.
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*/
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static struct dosDirEntry *freede;
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static struct dosDirEntry *
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newDosDirEntry(void)
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{
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struct dosDirEntry *de;
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if (!(de = freede)) {
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if (!(de = (struct dosDirEntry *)malloc(sizeof *de)))
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return 0;
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} else
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freede = de->next;
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return de;
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}
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static void
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freeDosDirEntry(struct dosDirEntry *de)
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{
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de->next = freede;
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freede = de;
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}
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/*
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* The same for dirTodoNode structures.
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*/
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static struct dirTodoNode *freedt;
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static struct dirTodoNode *
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newDirTodo(void)
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{
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struct dirTodoNode *dt;
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if (!(dt = freedt)) {
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if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt)))
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return 0;
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} else
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freedt = dt->next;
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return dt;
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}
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static void
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freeDirTodo(struct dirTodoNode *dt)
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{
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dt->next = freedt;
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freedt = dt;
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}
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/*
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* The stack of unread directories
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*/
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static struct dirTodoNode *pendingDirectories = NULL;
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/*
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* Return the full pathname for a directory entry.
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*/
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static char *
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fullpath(struct dosDirEntry *dir)
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{
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static char namebuf[MAXPATHLEN + 1];
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char *cp, *np;
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int nl;
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cp = namebuf + sizeof namebuf - 1;
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*cp = '\0';
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do {
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np = dir->lname[0] ? dir->lname : dir->name;
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nl = strlen(np);
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if ((cp -= nl) <= namebuf + 1)
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break;
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memcpy(cp, np, nl);
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*--cp = '/';
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} while ((dir = dir->parent) != NULL);
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if (dir)
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*--cp = '?';
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else
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cp++;
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return cp;
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}
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/*
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* Calculate a checksum over an 8.3 alias name
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*/
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static u_char
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calcShortSum(u_char *p)
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{
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u_char sum = 0;
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int i;
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for (i = 0; i < 11; i++) {
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sum = (sum << 7)|(sum >> 1); /* rotate right */
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sum += p[i];
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}
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return sum;
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}
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/*
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* Global variables temporarily used during a directory scan
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*/
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static char longName[DOSLONGNAMELEN] = "";
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static u_char *buffer = NULL;
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static u_char *delbuf = NULL;
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static struct dosDirEntry *rootDir;
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static struct dosDirEntry *lostDir;
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/*
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* Init internal state for a new directory scan.
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*/
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int
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resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
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{
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int b1, b2;
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cl_t cl;
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int ret = FSOK;
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size_t len;
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b1 = boot->bpbRootDirEnts * 32;
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b2 = boot->bpbSecPerClust * boot->bpbBytesPerSec;
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if ((buffer = malloc(len = MAX(b1, b2))) == NULL) {
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perr("No space for directory buffer (%zu)", len);
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return FSFATAL;
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}
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if ((delbuf = malloc(len = b2)) == NULL) {
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free(buffer);
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perr("No space for directory delbuf (%zu)", len);
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return FSFATAL;
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}
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if ((rootDir = newDosDirEntry()) == NULL) {
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free(buffer);
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free(delbuf);
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perr("No space for directory entry");
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return FSFATAL;
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}
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memset(rootDir, 0, sizeof *rootDir);
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if (boot->flags & FAT32) {
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if (boot->bpbRootClust < CLUST_FIRST ||
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boot->bpbRootClust >= boot->NumClusters) {
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pfatal("Root directory starts with cluster out of range(%u)",
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boot->bpbRootClust);
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return FSFATAL;
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}
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cl = fat[boot->bpbRootClust].next;
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if (cl < CLUST_FIRST
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|| (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
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|| fat[boot->bpbRootClust].head != boot->bpbRootClust) {
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if (cl == CLUST_FREE)
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pwarn("Root directory starts with free cluster\n");
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else if (cl >= CLUST_RSRVD)
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pwarn("Root directory starts with cluster marked %s\n",
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rsrvdcltype(cl));
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else {
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pfatal("Root directory doesn't start a cluster chain");
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return FSFATAL;
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}
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if (ask(1, "Fix")) {
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fat[boot->bpbRootClust].next = CLUST_FREE;
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ret = FSFATMOD;
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} else
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ret = FSFATAL;
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}
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fat[boot->bpbRootClust].flags |= FAT_USED;
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rootDir->head = boot->bpbRootClust;
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}
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return ret;
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}
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/*
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* Cleanup after a directory scan
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*/
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void
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finishDosDirSection(void)
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{
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struct dirTodoNode *p, *np;
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struct dosDirEntry *d, *nd;
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for (p = pendingDirectories; p; p = np) {
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np = p->next;
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freeDirTodo(p);
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}
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pendingDirectories = NULL;
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for (d = rootDir; d; d = nd) {
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if ((nd = d->child) != NULL) {
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d->child = 0;
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continue;
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}
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if (!(nd = d->next))
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nd = d->parent;
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freeDosDirEntry(d);
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}
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rootDir = lostDir = NULL;
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free(buffer);
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free(delbuf);
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buffer = NULL;
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delbuf = NULL;
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}
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/*
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* Delete directory entries between startcl, startoff and endcl, endoff.
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*/
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static int
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delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
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int startoff, cl_t endcl, int endoff, int notlast)
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{
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u_char *s, *e;
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off_t off;
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int clsz = boot->bpbSecPerClust * boot->bpbBytesPerSec;
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s = delbuf + startoff;
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e = delbuf + clsz;
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while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
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if (startcl == endcl) {
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if (notlast)
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break;
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e = delbuf + endoff;
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}
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off = startcl * boot->bpbSecPerClust + boot->ClusterOffset;
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off *= boot->bpbBytesPerSec;
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if (lseek(f, off, SEEK_SET) != off
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|| read(f, delbuf, clsz) != clsz) {
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perr("Unable to read directory");
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return FSFATAL;
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}
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while (s < e) {
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*s = SLOT_DELETED;
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s += 32;
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}
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if (lseek(f, off, SEEK_SET) != off
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|| write(f, delbuf, clsz) != clsz) {
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perr("Unable to write directory");
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return FSFATAL;
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}
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if (startcl == endcl)
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break;
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startcl = fat[startcl].next;
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s = delbuf;
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}
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return FSOK;
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}
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static int
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removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
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u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type)
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{
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switch (type) {
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case 0:
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pwarn("Invalid long filename entry for %s\n", path);
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break;
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case 1:
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pwarn("Invalid long filename entry at end of directory %s\n",
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path);
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break;
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case 2:
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pwarn("Invalid long filename entry for volume label\n");
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break;
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}
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if (ask(0, "Remove")) {
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if (startcl != curcl) {
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if (delete(f, boot, fat,
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startcl, start - buffer,
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endcl, end - buffer,
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endcl == curcl) == FSFATAL)
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return FSFATAL;
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start = buffer;
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}
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/* startcl is < CLUST_FIRST for !fat32 root */
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if ((endcl == curcl) || (startcl < CLUST_FIRST))
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for (; start < end; start += 32)
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*start = SLOT_DELETED;
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return FSDIRMOD;
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}
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return FSERROR;
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}
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/*
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* Check an in-memory file entry
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*/
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static int
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checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
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struct dosDirEntry *dir)
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{
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/*
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* Check size on ordinary files
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*/
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u_int32_t physicalSize;
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if (dir->head == CLUST_FREE)
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physicalSize = 0;
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else {
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if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
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return FSERROR;
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physicalSize = fat[dir->head].length * boot->ClusterSize;
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}
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if (physicalSize < dir->size) {
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pwarn("size of %s is %u, should at most be %u\n",
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fullpath(dir), dir->size, physicalSize);
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if (ask(1, "Truncate")) {
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dir->size = physicalSize;
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p[28] = (u_char)physicalSize;
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p[29] = (u_char)(physicalSize >> 8);
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p[30] = (u_char)(physicalSize >> 16);
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p[31] = (u_char)(physicalSize >> 24);
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return FSDIRMOD;
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} else
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return FSERROR;
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} else if (physicalSize - dir->size >= boot->ClusterSize) {
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pwarn("%s has too many clusters allocated\n",
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fullpath(dir));
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if (ask(1, "Drop superfluous clusters")) {
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cl_t cl;
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u_int32_t sz, len;
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for (cl = dir->head, len = sz = 0;
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(sz += boot->ClusterSize) < dir->size; len++)
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cl = fat[cl].next;
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clearchain(boot, fat, fat[cl].next);
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fat[cl].next = CLUST_EOF;
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fat[dir->head].length = len;
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return FSFATMOD;
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} else
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return FSERROR;
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}
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return FSOK;
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}
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/*
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* Read a directory and
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* - resolve long name records
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* - enter file and directory records into the parent's list
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* - push directories onto the todo-stack
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*/
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static int
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readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
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struct dosDirEntry *dir)
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{
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struct dosDirEntry dirent, *d;
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u_char *p, *vallfn, *invlfn, *empty;
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off_t off;
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int i, j, k, last;
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cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
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char *t;
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u_int lidx = 0;
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int shortSum;
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int mod = FSOK;
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#define THISMOD 0x8000 /* Only used within this routine */
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cl = dir->head;
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if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
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/*
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* Already handled somewhere else.
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*/
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return FSOK;
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}
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shortSum = -1;
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vallfn = invlfn = empty = NULL;
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do {
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if (!(boot->flags & FAT32) && !dir->parent) {
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last = boot->bpbRootDirEnts * 32;
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off = boot->bpbResSectors + boot->bpbFATs *
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boot->FATsecs;
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} else {
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last = boot->bpbSecPerClust * boot->bpbBytesPerSec;
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off = cl * boot->bpbSecPerClust + boot->ClusterOffset;
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}
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off *= boot->bpbBytesPerSec;
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if (lseek(f, off, SEEK_SET) != off
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|| read(f, buffer, last) != last) {
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perr("Unable to read directory");
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return FSFATAL;
|
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}
|
|
last /= 32;
|
|
/*
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|
* Check `.' and `..' entries here? XXX
|
|
*/
|
|
for (p = buffer, i = 0; i < last; i++, p += 32) {
|
|
if (dir->fsckflags & DIREMPWARN) {
|
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*p = SLOT_EMPTY;
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continue;
|
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}
|
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|
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if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
|
|
if (*p == SLOT_EMPTY) {
|
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dir->fsckflags |= DIREMPTY;
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empty = p;
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empcl = cl;
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}
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continue;
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}
|
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|
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if (dir->fsckflags & DIREMPTY) {
|
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if (!(dir->fsckflags & DIREMPWARN)) {
|
|
pwarn("%s has entries after end of directory\n",
|
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fullpath(dir));
|
|
if (ask(1, "Extend")) {
|
|
u_char *q;
|
|
|
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dir->fsckflags &= ~DIREMPTY;
|
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if (delete(f, boot, fat,
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empcl, empty - buffer,
|
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cl, p - buffer, 1) == FSFATAL)
|
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return FSFATAL;
|
|
q = empcl == cl ? empty : buffer;
|
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for (; q < p; q += 32)
|
|
*q = SLOT_DELETED;
|
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mod |= THISMOD|FSDIRMOD;
|
|
} else if (ask(0, "Truncate"))
|
|
dir->fsckflags |= DIREMPWARN;
|
|
}
|
|
if (dir->fsckflags & DIREMPWARN) {
|
|
*p = SLOT_DELETED;
|
|
mod |= THISMOD|FSDIRMOD;
|
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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())) {
|
|
perr("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())) {
|
|
perr("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) {
|
|
perr("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) {
|
|
perr("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;
|
|
int len;
|
|
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) {
|
|
perr("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->bpbBytesPerSec;
|
|
if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
|
|
|| (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
|
|
perr("could not read LOST.DIR");
|
|
return FSFATAL;
|
|
}
|
|
p = lfbuf;
|
|
}
|
|
|
|
boot->NumFiles++;
|
|
/* Ensure uniqueness of entry here! XXX */
|
|
memset(&d, 0, sizeof d);
|
|
/* worst case -1 = 4294967295, 10 digits */
|
|
len = snprintf(d.name, sizeof(d.name), "%u", head);
|
|
d.flags = 0;
|
|
d.head = head;
|
|
d.size = fat[head].length * boot->ClusterSize;
|
|
|
|
memcpy(p, d.name, len);
|
|
memset(p + len, ' ', 11 - len);
|
|
memset(p + 11, 0, 32 - 11);
|
|
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
|
|
|| (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
|
|
perr("could not write LOST.DIR");
|
|
return FSFATAL;
|
|
}
|
|
return FSDIRMOD;
|
|
}
|
|
|
|
void
|
|
finishlf(void)
|
|
{
|
|
if (lfbuf)
|
|
free(lfbuf);
|
|
lfbuf = NULL;
|
|
}
|