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544 lines
16 KiB
C
544 lines
16 KiB
C
/* lfn.c - Functions for handling VFAT long filenames
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Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
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Copyright (C) 2015 Andreas Bombe <aeb@debian.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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The complete text of the GNU General Public License
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can be found in /usr/share/common-licenses/GPL-3 file.
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*/
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#include "vfatlib.h"
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#define NDEBUG
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#include <debug.h>
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typedef struct {
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uint8_t id; /* sequence number for slot */
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uint8_t name0_4[10]; /* first 5 characters in name */
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uint8_t attr; /* attribute byte */
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uint8_t reserved; /* always 0 */
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uint8_t alias_checksum; /* checksum for 8.3 alias */
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uint8_t name5_10[12]; /* 6 more characters in name */
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uint16_t start; /* starting cluster number, 0 in long slots */
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uint8_t name11_12[4]; /* last 2 characters in name */
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} LFN_ENT;
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#define LFN_ID_START 0x40
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#define LFN_ID_SLOTMASK 0x1f
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#define CHARS_PER_LFN 13
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/* These modul-global vars represent the state of the LFN parser */
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unsigned char *lfn_unicode = NULL;
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unsigned char lfn_checksum;
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int lfn_slot = -1;
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off_t *lfn_offsets = NULL;
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int lfn_parts = 0;
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static unsigned char fat_uni2esc[64] = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
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'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
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'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
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'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
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'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
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'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z', '+', '-'
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};
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/* This defines which unicode chars are directly convertable to ISO-8859-1 */
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#define UNICODE_CONVERTABLE(cl,ch) (ch == 0 && (cl < 0x80 || cl >= 0xa0))
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/* for maxlen param */
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#define UNTIL_0 INT_MAX
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#ifdef __REACTOS__
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static void copy_lfn_part(unsigned char *dst, LFN_ENT * lfn);
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static char *cnv_unicode(const unsigned char *uni, int maxlen, int use_q);
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#endif
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/* Convert name part in 'lfn' from unicode to ASCII */
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#ifndef __REACTOS__
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#define CNV_THIS_PART(lfn) \
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({ \
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unsigned char __part_uni[CHARS_PER_LFN*2]; \
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copy_lfn_part( __part_uni, lfn ); \
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cnv_unicode( __part_uni, CHARS_PER_LFN, 0 ); \
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})
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#else
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static __inline char* CNV_THIS_PART(LFN_ENT * lfn)
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{
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unsigned char __part_uni[CHARS_PER_LFN*2];
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copy_lfn_part(__part_uni, lfn);
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return cnv_unicode(__part_uni, CHARS_PER_LFN, 0);
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}
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#endif
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/* Convert name parts collected so far (from previous slots) from unicode to
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* ASCII */
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#define CNV_PARTS_SO_FAR() \
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(cnv_unicode( lfn_unicode+(lfn_slot*CHARS_PER_LFN*2), \
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lfn_parts*CHARS_PER_LFN, 0 ))
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#define BYTES_TO_WCHAR(cl,ch) ((wchar_t)((unsigned)(cl) + ((unsigned)(ch) << 8)))
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static size_t mbslen(wchar_t x)
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{
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wchar_t wstr[] = { x, 0 };
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return wcstombs(NULL, wstr, 0);
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}
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static size_t wctombs(char *dest, wchar_t x)
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{
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wchar_t wstr[] = { x, 0 };
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size_t size = wcstombs(NULL, wstr, 0);
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if (size != (size_t) - 1)
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size = wcstombs(dest, wstr, size + 1);
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return size;
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}
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/* This function converts an unicode string to a normal ASCII string, assuming
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* ISO-8859-1 charset. Characters not in 8859-1 are converted to the same
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* escape notation as used by the kernel, i.e. the uuencode-like ":xxx" */
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static char *cnv_unicode(const unsigned char *uni, int maxlen, int use_q)
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{
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const unsigned char *up;
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unsigned char *out, *cp;
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int len, val;
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size_t x;
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for (len = 0, up = uni; (up - uni) / 2 < maxlen && (up[0] || up[1]);
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up += 2) {
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if ((x = mbslen(BYTES_TO_WCHAR(up[0], up[1]))) != (size_t) - 1)
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len += x;
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else if (UNICODE_CONVERTABLE(up[0], up[1]))
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++len;
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else
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len += 4;
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}
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cp = out = use_q ? qalloc(&mem_queue, len + 1) : alloc(len + 1);
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for (up = uni; (up - uni) / 2 < maxlen && (up[0] || up[1]); up += 2) {
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if ((x =
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wctombs((char *)cp, BYTES_TO_WCHAR(up[0], up[1]))) != (size_t) - 1)
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cp += x;
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else if (UNICODE_CONVERTABLE(up[0], up[1]))
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*cp++ = up[0];
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else {
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/* here the same escape notation is used as in the Linux kernel */
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*cp++ = ':';
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val = (up[1] << 8) + up[0];
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cp[2] = fat_uni2esc[val & 0x3f];
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val >>= 6;
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cp[1] = fat_uni2esc[val & 0x3f];
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val >>= 6;
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cp[0] = fat_uni2esc[val & 0x3f];
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cp += 3;
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}
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}
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*cp = 0;
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return (char *)out;
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}
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static void copy_lfn_part(unsigned char *dst, LFN_ENT * lfn)
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{
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memcpy(dst, lfn->name0_4, 10);
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memcpy(dst + 10, lfn->name5_10, 12);
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memcpy(dst + 22, lfn->name11_12, 4);
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}
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static void clear_lfn_slots(int start, int end)
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{
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int i;
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LFN_ENT empty;
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/* New dir entry is zeroed except first byte, which is set to 0xe5.
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* This is to avoid that some FAT-reading OSes (not Linux! ;) stop reading
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* a directory at the first zero entry...
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*/
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memset(&empty, 0, sizeof(empty));
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empty.id = DELETED_FLAG;
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for (i = start; i <= end; ++i) {
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fs_write(lfn_offsets[i], sizeof(LFN_ENT), &empty);
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}
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}
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void lfn_fix_checksum(off_t from, off_t to, const char *short_name)
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{
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int i;
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uint8_t sum;
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for (sum = 0, i = 0; i < 11; i++)
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sum = (((sum & 1) << 7) | ((sum & 0xfe) >> 1)) + short_name[i];
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for (; from < to; from += sizeof(LFN_ENT)) {
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fs_write(from + offsetof(LFN_ENT, alias_checksum), sizeof(sum), &sum);
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}
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}
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void lfn_reset(void)
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{
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if (lfn_unicode)
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free(lfn_unicode);
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lfn_unicode = NULL;
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if (lfn_offsets)
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free(lfn_offsets);
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lfn_offsets = NULL;
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lfn_slot = -1;
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}
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/* This function is only called with de->attr == VFAT_LN_ATTR. It stores part
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* of the long name. */
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void lfn_add_slot(DIR_ENT * de, off_t dir_offset)
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{
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LFN_ENT *lfn = (LFN_ENT *) de;
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int slot = lfn->id & LFN_ID_SLOTMASK;
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unsigned offset;
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if (lfn_slot == 0)
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lfn_check_orphaned();
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if (de->attr != VFAT_LN_ATTR)
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die("lfn_add_slot called with non-LFN directory entry");
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if (lfn->id & LFN_ID_START && slot != 0) {
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if (lfn_slot != -1) {
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int can_clear = 0;
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/* There is already a LFN "in progess", so it is an error that a
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* new start entry is here. */
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/* Causes: 1) if slot# == expected: start bit set mysteriously, 2)
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* old LFN overwritten by new one */
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/* Fixes: 1) delete previous LFN 2) if slot# == expected and
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* checksum ok: clear start bit */
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/* XXX: Should delay that until next LFN known (then can better
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* display the name) */
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printf("A new long file name starts within an old one.\n");
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if (slot == lfn_slot && lfn->alias_checksum == lfn_checksum) {
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char *part1 = CNV_THIS_PART(lfn);
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char *part2 = CNV_PARTS_SO_FAR();
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printf(" It could be that the LFN start bit is wrong here\n"
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" if \"%s\" seems to match \"%s\".\n", part1, part2);
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free(part1);
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free(part2);
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can_clear = 1;
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}
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if (interactive) {
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printf("1: Delete previous LFN\n2: Leave it as it is.\n");
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if (can_clear)
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printf("3: Clear start bit and concatenate LFNs\n");
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} else
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printf(" Not auto-correcting this.\n");
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if (interactive) {
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switch (get_key(can_clear ? "123" : "12", "?")) {
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case '1':
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clear_lfn_slots(0, lfn_parts - 1);
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lfn_reset();
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break;
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case '2':
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break;
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case '3':
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lfn->id &= ~LFN_ID_START;
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fs_write(dir_offset + offsetof(LFN_ENT, id),
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sizeof(lfn->id), &lfn->id);
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break;
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}
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}
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}
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lfn_slot = slot;
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lfn_checksum = lfn->alias_checksum;
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lfn_unicode = alloc((lfn_slot * CHARS_PER_LFN + 1) * 2);
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lfn_offsets = alloc(lfn_slot * sizeof(off_t));
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lfn_parts = 0;
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} else if (lfn_slot == -1 && slot != 0) {
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/* No LFN in progress, but slot found; start bit missing */
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/* Causes: 1) start bit got lost, 2) Previous slot with start bit got
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* lost */
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/* Fixes: 1) delete LFN, 2) set start bit */
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char *part = CNV_THIS_PART(lfn);
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printf("Long filename fragment \"%s\" found outside a LFN "
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"sequence.\n (Maybe the start bit is missing on the "
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"last fragment)\n", part);
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free(part);
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if (interactive) {
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printf("1: Delete fragment\n2: Leave it as it is.\n"
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"3: Set start bit\n");
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} else
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printf(" Not auto-correcting this.\n");
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switch (interactive ? get_key("123", "?") : '2') {
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case '1':
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if (!lfn_offsets)
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lfn_offsets = alloc(sizeof(off_t));
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lfn_offsets[0] = dir_offset;
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clear_lfn_slots(0, 0);
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lfn_reset();
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return;
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case '2':
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lfn_reset();
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return;
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case '3':
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lfn->id |= LFN_ID_START;
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fs_write(dir_offset + offsetof(LFN_ENT, id),
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sizeof(lfn->id), &lfn->id);
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lfn_slot = slot;
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lfn_checksum = lfn->alias_checksum;
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lfn_unicode = alloc((lfn_slot * CHARS_PER_LFN + 1) * 2);
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lfn_offsets = alloc(lfn_slot * sizeof(off_t));
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lfn_parts = 0;
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break;
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}
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} else if (slot != lfn_slot) {
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/* wrong sequence number */
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/* Causes: 1) seq-no destroyed */
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/* Fixes: 1) delete LFN, 2) fix number (maybe only if following parts
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* are ok?, maybe only if checksum is ok?) (Attention: space
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* for name was allocated before!) */
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int can_fix = 0;
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printf("Unexpected long filename sequence number "
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"(%d vs. expected %d).\n", slot, lfn_slot);
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if (lfn->alias_checksum == lfn_checksum && lfn_slot > 0) {
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char *part1 = CNV_THIS_PART(lfn);
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char *part2 = CNV_PARTS_SO_FAR();
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printf(" It could be that just the number is wrong\n"
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" if \"%s\" seems to match \"%s\".\n", part1, part2);
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free(part1);
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free(part2);
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can_fix = 1;
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}
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if (interactive) {
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printf
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("1: Delete LFN\n2: Leave it as it is (and ignore LFN so far)\n");
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if (can_fix)
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printf("3: Correct sequence number\n");
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} else
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printf(" Not auto-correcting this.\n");
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switch (interactive ? get_key(can_fix ? "123" : "12", "?") : '2') {
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case '1':
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if (!lfn_offsets) {
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lfn_offsets = alloc(sizeof(off_t));
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lfn_parts = 0;
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}
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lfn_offsets[lfn_parts++] = dir_offset;
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clear_lfn_slots(0, lfn_parts - 1);
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lfn_reset();
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return;
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case '2':
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lfn_reset();
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return;
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case '3':
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lfn->id = (lfn->id & ~LFN_ID_SLOTMASK) | lfn_slot;
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fs_write(dir_offset + offsetof(LFN_ENT, id),
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sizeof(lfn->id), &lfn->id);
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break;
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}
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}
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if (lfn->alias_checksum != lfn_checksum) {
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/* checksum mismatch */
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/* Causes: 1) checksum field here destroyed */
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/* Fixes: 1) delete LFN, 2) fix checksum */
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printf("Checksum in long filename part wrong "
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"(%02x vs. expected %02x).\n",
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lfn->alias_checksum, lfn_checksum);
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if (interactive) {
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printf("1: Delete LFN\n2: Leave it as it is.\n"
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"3: Correct checksum\n");
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} else
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printf(" Not auto-correcting this.\n");
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if (interactive) {
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switch (get_key("123", "?")) {
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case '1':
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lfn_offsets[lfn_parts++] = dir_offset;
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clear_lfn_slots(0, lfn_parts - 1);
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lfn_reset();
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return;
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case '2':
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break;
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case '3':
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lfn->alias_checksum = lfn_checksum;
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fs_write(dir_offset + offsetof(LFN_ENT, alias_checksum),
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sizeof(lfn->alias_checksum), &lfn->alias_checksum);
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break;
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}
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}
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}
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if (lfn_slot != -1) {
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lfn_slot--;
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offset = lfn_slot * CHARS_PER_LFN * 2;
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copy_lfn_part(lfn_unicode + offset, lfn);
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if (lfn->id & LFN_ID_START)
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lfn_unicode[offset + 26] = lfn_unicode[offset + 27] = 0;
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lfn_offsets[lfn_parts++] = dir_offset;
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}
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if (lfn->reserved != 0) {
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printf("Reserved field in VFAT long filename slot is not 0 "
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"(but 0x%02x).\n", lfn->reserved);
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if (interactive)
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printf("1: Fix.\n2: Leave it.\n");
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else
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printf("Auto-setting to 0.\n");
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if (!interactive || get_key("12", "?") == '1') {
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lfn->reserved = 0;
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fs_write(dir_offset + offsetof(LFN_ENT, reserved),
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sizeof(lfn->reserved), &lfn->reserved);
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}
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}
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if (lfn->start != htole16(0)) {
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printf("Start cluster field in VFAT long filename slot is not 0 "
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"(but 0x%04x).\n", lfn->start);
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if (interactive)
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printf("1: Fix.\n2: Leave it.\n");
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else
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printf("Auto-setting to 0.\n");
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if (!interactive || get_key("12", "?") == '1') {
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lfn->start = htole16(0);
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fs_write(dir_offset + offsetof(LFN_ENT, start),
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sizeof(lfn->start), &lfn->start);
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}
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}
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}
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/* This function is always called when de->attr != VFAT_LN_ATTR is found, to
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* retrieve the previously constructed LFN. */
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char *lfn_get(DIR_ENT * de, off_t * lfn_offset)
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{
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char *lfn;
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uint8_t sum;
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int i;
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*lfn_offset = 0;
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if (de->attr == VFAT_LN_ATTR)
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die("lfn_get called with LFN directory entry");
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#if 0
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if (de->lcase)
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printf("lcase=%02x\n", de->lcase);
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#endif
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if (lfn_slot == -1)
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/* no long name for this file */
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return NULL;
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if (lfn_slot != 0) {
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/* The long name isn't finished yet. */
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/* Causes: 1) LFN slot overwritten by non-VFAT aware tool */
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/* Fixes: 1) delete LFN 2) move overwriting entry to somewhere else
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* and let user enter missing part of LFN (hard to do :-()
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* 3) renumber entries and truncate name */
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char *long_name = CNV_PARTS_SO_FAR();
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char *short_name = file_name(de->name);
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printf("Unfinished long file name \"%s\".\n"
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" (Start may have been overwritten by %s)\n",
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long_name, short_name);
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free(long_name);
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if (interactive) {
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printf("1: Delete LFN\n2: Leave it as it is.\n"
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"3: Fix numbering (truncates long name and attaches "
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"it to short name %s)\n", short_name);
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} else
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printf(" Not auto-correcting this.\n");
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switch (interactive ? get_key("123", "?") : '2') {
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|
case '1':
|
|
clear_lfn_slots(0, lfn_parts - 1);
|
|
lfn_reset();
|
|
return NULL;
|
|
case '2':
|
|
lfn_reset();
|
|
return NULL;
|
|
case '3':
|
|
for (i = 0; i < lfn_parts; ++i) {
|
|
uint8_t id = (lfn_parts - i) | (i == 0 ? LFN_ID_START : 0);
|
|
fs_write(lfn_offsets[i] + offsetof(LFN_ENT, id),
|
|
sizeof(id), &id);
|
|
}
|
|
memmove(lfn_unicode, lfn_unicode + lfn_slot * CHARS_PER_LFN * 2,
|
|
lfn_parts * CHARS_PER_LFN * 2);
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (sum = 0, i = 0; i < MSDOS_NAME; i++)
|
|
sum = (((sum & 1) << 7) | ((sum & 0xfe) >> 1)) + de->name[i];
|
|
if (sum != lfn_checksum) {
|
|
/* checksum doesn't match, long name doesn't apply to this alias */
|
|
/* Causes: 1) alias renamed */
|
|
/* Fixes: 1) Fix checksum in LFN entries */
|
|
char *long_name = CNV_PARTS_SO_FAR();
|
|
char *short_name = file_name(de->name);
|
|
printf("Wrong checksum for long file name \"%s\".\n"
|
|
" (Short name %s may have changed without updating the long name)\n",
|
|
long_name, short_name);
|
|
free(long_name);
|
|
if (interactive) {
|
|
printf("1: Delete LFN\n2: Leave it as it is.\n"
|
|
"3: Fix checksum (attaches to short name %s)\n", short_name);
|
|
} else
|
|
printf(" Not auto-correcting this.\n");
|
|
if (interactive) {
|
|
switch (get_key("123", "?")) {
|
|
case '1':
|
|
clear_lfn_slots(0, lfn_parts - 1);
|
|
lfn_reset();
|
|
return NULL;
|
|
case '2':
|
|
lfn_reset();
|
|
return NULL;
|
|
case '3':
|
|
for (i = 0; i < lfn_parts; ++i) {
|
|
fs_write(lfn_offsets[i] + offsetof(LFN_ENT, alias_checksum),
|
|
sizeof(sum), &sum);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
*lfn_offset = lfn_offsets[0];
|
|
lfn = cnv_unicode(lfn_unicode, UNTIL_0, 1);
|
|
lfn_reset();
|
|
return (lfn);
|
|
}
|
|
|
|
void lfn_check_orphaned(void)
|
|
{
|
|
char *long_name;
|
|
|
|
if (lfn_slot == -1)
|
|
return;
|
|
|
|
long_name = CNV_PARTS_SO_FAR();
|
|
printf("Orphaned long file name part \"%s\"\n", long_name);
|
|
free(long_name);
|
|
if (interactive)
|
|
printf("1: Delete.\n2: Leave it.\n");
|
|
#ifdef __REACTOS__
|
|
else if (rw)
|
|
#else
|
|
else
|
|
#endif
|
|
printf(" Auto-deleting.\n");
|
|
#ifdef __REACTOS__
|
|
if ((!interactive && rw) || (interactive && get_key("12", "?") == '1')) {
|
|
#else
|
|
if (!interactive || get_key("12", "?") == '1') {
|
|
#endif
|
|
clear_lfn_slots(0, lfn_parts - 1);
|
|
}
|
|
lfn_reset();
|
|
}
|