sys/vfs/msdosfs/msdosfs_conv.c

   1 /* $FreeBSD: src/sys/msdosfs/msdosfs_conv.c,v 1.29.2.1 2002/11/08 22:01:22 semenu Exp $ */
   2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_conv.c,v 1.7 2006/12/23 00:41:29 swildner Exp $ */
   3 /*      $NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $     */
   4
   5 /*-
   6  * Copyright (C) 1995, 1997 Wolfgang Solfrank.
   7  * Copyright (C) 1995, 1997 TooLs GmbH.
   8  * All rights reserved.
   9  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by TooLs GmbH.
  22  * 4. The name of TooLs GmbH may not be used to endorse or promote products
  23  *    derived from this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
  26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  28  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  31  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  32  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  33  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  34  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36 /*
  37  * Written by Paul Popelka (paulp@uts.amdahl.com)
  38  *
  39  * You can do anything you want with this software, just don't say you wrote
  40  * it, and don't remove this notice.
  41  *
  42  * This software is provided "as is".
  43  *
  44  * The author supplies this software to be publicly redistributed on the
  45  * understanding that the author is not responsible for the correct
  46  * functioning of this software in any circumstances and is not liable for
  47  * any damages caused by this software.
  48  *
  49  * October 1992
  50  */
  51
  52 /*
  53  * System include files.
  54  */
  55 #include <sys/param.h>
  56 #include <sys/time.h>
  57 #include <sys/kernel.h>         /* defines tz */
  58 #include <sys/systm.h>
  59 #include <sys/iconv.h>
  60 #include <machine/clock.h>
  61 #include <sys/dirent.h>
  62 #include <sys/mount.h>
  63 /*
  64  * MSDOSFS include files.
  65  */
  66 #include "bpb.h"
  67 #include "msdosfsmount.h"
  68 #include "direntry.h"
  69
  70 extern struct iconv_functions *msdos_iconv;
  71
  72 /*
  73  * Total number of days that have passed for each month in a regular year.
  74  */
  75 static u_short regyear[] = {
  76         31, 59, 90, 120, 151, 181,
  77         212, 243, 273, 304, 334, 365
  78 };
  79
  80 /*
  81  * Total number of days that have passed for each month in a leap year.
  82  */
  83 static u_short leapyear[] = {
  84         31, 60, 91, 121, 152, 182,
  85         213, 244, 274, 305, 335, 366
  86 };
  87
  88 /*
  89  * Variables used to remember parts of the last time conversion.  Maybe we
  90  * can avoid a full conversion.
  91  */
  92 static u_long  lasttime;
  93 static u_long  lastday;
  94 static u_short lastddate;
  95 static u_short lastdtime;
  96
  97 static __inline u_int8_t find_lcode (u_int16_t code, u_int16_t *u2w);
  98
  99 /*
 100  * Convert the unix version of time to dos's idea of time to be used in
 101  * file timestamps. The passed in unix time is assumed to be in GMT.
 102  */
 103 void
 104 unix2dostime(struct timespec *tsp, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp)
 105 {
 106         u_long t;
 107         u_long days;
 108         u_long inc;
 109         u_long year;
 110         u_long month;
 111         u_short *months;
 112
 113         /*
 114          * If the time from the last conversion is the same as now, then
 115          * skip the computations and use the saved result.
 116          */
 117         t = tsp->tv_sec - (tz.tz_minuteswest * 60)
 118             - (wall_cmos_clock ? adjkerntz : 0);
 119             /* - daylight savings time correction */
 120         t &= ~1;
 121         if (lasttime != t) {
 122                 lasttime = t;
 123                 lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
 124                     + (((t / 60) % 60) << DT_MINUTES_SHIFT)
 125                     + (((t / 3600) % 24) << DT_HOURS_SHIFT);
 126
 127                 /*
 128                  * If the number of days since 1970 is the same as the last
 129                  * time we did the computation then skip all this leap year
 130                  * and month stuff.
 131                  */
 132                 days = t / (24 * 60 * 60);
 133                 if (days != lastday) {
 134                         lastday = days;
 135                         for (year = 1970;; year++) {
 136                                 inc = year & 0x03 ? 365 : 366;
 137                                 if (days < inc)
 138                                         break;
 139                                 days -= inc;
 140                         }
 141                         months = year & 0x03 ? regyear : leapyear;
 142                         for (month = 0; days >= months[month]; month++)
 143                                 ;
 144                         if (month > 0)
 145                                 days -= months[month - 1];
 146                         lastddate = ((days + 1) << DD_DAY_SHIFT)
 147                             + ((month + 1) << DD_MONTH_SHIFT);
 148                         /*
 149                          * Remember dos's idea of time is relative to 1980.
 150                          * unix's is relative to 1970.  If somehow we get a
 151                          * time before 1980 then don't give totally crazy
 152                          * results.
 153                          */
 154                         if (year > 1980)
 155                                 lastddate += (year - 1980) << DD_YEAR_SHIFT;
 156                 }
 157         }
 158         if (dtp)
 159                 *dtp = lastdtime;
 160         if (dhp)
 161                 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
 162
 163         *ddp = lastddate;
 164 }
 165
 166 /*
 167  * The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
 168  * interval there were 8 regular years and 2 leap years.
 169  */
 170 #define SECONDSTO1980   (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
 171
 172 static u_short lastdosdate;
 173 static u_long  lastseconds;
 174
 175 /*
 176  * Initialize the temporary concatenation buffer.
 177  */
 178 void
 179 mbnambuf_init(struct mbnambuf *nbp)
 180 {
 181         nbp->nb_len = 0;
 182         nbp->nb_last_id = -1;
 183         nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
 184 }
 185 /*
 186  * Fill out our concatenation buffer with the given substring, at the offset
 187  * specified by its id.  Since this function must be called with ids in
 188  * descending order, we take advantage of the fact that ASCII substrings are
 189  * exactly WIN_CHARS in length.  For non-ASCII substrings, we shift all
 190  * previous (i.e. higher id) substrings upwards to make room for this one.
 191  * This only penalizes portions of substrings that contain more than
 192  * WIN_CHARS bytes when they are first encountered.
 193  */
 194 void
 195 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
 196 {
 197         char *slot;
 198         size_t count, newlen;
 199         if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
 200                 kprintf("msdosfs: non-decreasing id: id %d, last id %d\n",
 201                     id, nbp->nb_last_id);
 202                 return;
 203         }
 204         /* Will store this substring in a WIN_CHARS-aligned slot. */
 205         slot = &nbp->nb_buf[id * WIN_CHARS];
 206         count = strlen(name);
 207         newlen = nbp->nb_len + count;
 208         if (newlen > WIN_MAXLEN || newlen > 127) {
 209                 kprintf("msdosfs: file name length %zu too large\n", newlen);
 210                 return;
 211         }
 212         /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
 213         if (count > WIN_CHARS && nbp->nb_len != 0)
 214                 bcopy(slot + WIN_CHARS, slot + count, nbp->nb_len);
 215         /* Copy in the substring to its slot and update length so far. */
 216         bcopy(name, slot, count);
 217         nbp->nb_len = newlen;
 218         nbp->nb_last_id = id;
 219 }
 220 /*
 221  * Take the completed string and use it to setup the struct dirent.
 222  * Be sure to always nul-terminate the d_name and then copy the string
 223  * from our buffer.  Note that this function assumes the full string has
 224  * been reassembled in the buffer.  If it's called before all substrings
 225  * have been written via mbnambuf_write(), the result will be incorrect.
 226  */
 227 char *
 228 mbnambuf_flush(struct mbnambuf *nbp, char *d_name, u_int16_t *d_namlen)
 229 {
 230 #if 0
 231         if (nbp->nb_len > 127) {
 232                 mbnambuf_init(nbp);
 233                 return (NULL);
 234         }
 235 #endif
 236         bcopy(&nbp->nb_buf[0], d_name, nbp->nb_len);
 237         d_name[nbp->nb_len] = '\0';
 238         *d_namlen = nbp->nb_len;
 239         mbnambuf_init(nbp);
 240         return (d_name);
 241 }
 242
 243 /*
 244  * Convert from dos' idea of time to unix'. This will probably only be
 245  * called from the stat(), and fstat() system calls and so probably need
 246  * not be too efficient.
 247  */
 248 void
 249 dos2unixtime(u_int dd, u_int dt, u_int dh, struct timespec *tsp)
 250 {
 251         u_long seconds;
 252         u_long month;
 253         u_long year;
 254         u_long days;
 255         u_short *months;
 256
 257         if (dd == 0) {
 258                 /*
 259                  * Uninitialized field, return the epoch.
 260                  */
 261                 tsp->tv_sec = 0;
 262                 tsp->tv_nsec = 0;
 263                 return;
 264         }
 265         seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
 266             + ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
 267             + ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
 268             + dh / 100;
 269         /*
 270          * If the year, month, and day from the last conversion are the
 271          * same then use the saved value.
 272          */
 273         if (lastdosdate != dd) {
 274                 lastdosdate = dd;
 275                 days = 0;
 276                 year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
 277                 days = year * 365;
 278                 days += year / 4 + 1;   /* add in leap days */
 279                 if ((year & 0x03) == 0)
 280                         days--;         /* if year is a leap year */
 281                 months = year & 0x03 ? regyear : leapyear;
 282                 month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
 283                 if (month < 1 || month > 12) {
 284                         kprintf("dos2unixtime(): month value out of range (%ld)\n",
 285                             month);
 286                         month = 1;
 287                 }
 288                 if (month > 1)
 289                         days += months[month - 2];
 290                 days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
 291                 lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
 292         }
 293         tsp->tv_sec = seconds + lastseconds + (tz.tz_minuteswest * 60)
 294              + adjkerntz;
 295              /* + daylight savings time correction */
 296         tsp->tv_nsec = (dh % 100) * 10000000;
 297 }
 298
 299 /*
 300  * 0 - character disallowed in long file name.
 301  * 1 - character should be replaced by '_' in DOS file name,
 302  *     and generation number inserted.
 303  * 2 - character ('.' and ' ') should be skipped in DOS file name,
 304  *     and generation number inserted.
 305  */
 306 static u_char
 307 unix2dos[256] = {
 308         0,    0,    0,    0,    0,    0,    0,    0,    /* 00-07 */
 309         0,    0,    0,    0,    0,    0,    0,    0,    /* 08-0f */
 310         0,    0,    0,    0,    0,    0,    0,    0,    /* 10-17 */
 311         0,    0,    0,    0,    0,    0,    0,    0,    /* 18-1f */
 312         2,    0x21, 0,    0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 313         0x28, 0x29, 0,    1,    1,    0x2d, 2,    0,    /* 28-2f */
 314         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 315         0x38, 0x39, 0,    1,    0,    1,    0,    0,    /* 38-3f */
 316         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
 317         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
 318         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
 319         0x58, 0x59, 0x5a, 1,    0,    1,    0x5e, 0x5f, /* 58-5f */
 320         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
 321         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
 322         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
 323         0x58, 0x59, 0x5a, 0x7b, 0,    0x7d, 0x7e, 0,    /* 78-7f */
 324         0,    0,    0,    0,    0,    0,    0,    0,    /* 80-87 */
 325         0,    0,    0,    0,    0,    0,    0,    0,    /* 88-8f */
 326         0,    0,    0,    0,    0,    0,    0,    0,    /* 90-97 */
 327         0,    0,    0,    0,    0,    0,    0,    0,    /* 98-9f */
 328         0,    0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
 329         0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
 330         0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
 331         0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
 332         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
 333         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
 334         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
 335         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
 336         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
 337         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
 338         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
 339         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
 340 };
 341
 342 static u_char
 343 dos2unix[256] = {
 344         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
 345         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
 346         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
 347         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
 348         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 349         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 350         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 351         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 352         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
 353         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
 354         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
 355         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 356         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 357         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 358         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 359         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 360         0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
 361         0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
 362         0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
 363         0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
 364         0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
 365         0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
 366         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
 367         0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
 368         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
 369         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
 370         0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
 371         0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
 372         0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
 373         0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
 374         0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
 375         0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
 376 };
 377
 378 static u_char
 379 u2l[256] = {
 380         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
 381         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
 382         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
 383         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
 384         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 385         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 386         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 387         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 388         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
 389         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
 390         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
 391         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 392         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 393         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 394         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 395         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 396         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
 397         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
 398         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
 399         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
 400         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
 401         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
 402         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
 403         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
 404         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
 405         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
 406         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
 407         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
 408         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
 409         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
 410         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
 411         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
 412 };
 413
 414 static u_char
 415 l2u[256] = {
 416         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
 417         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
 418         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
 419         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
 420         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 421         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 422         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 423         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 424         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
 425         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
 426         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
 427         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 428         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 429         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 430         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 431         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 432         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
 433         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
 434         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
 435         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
 436         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
 437         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
 438         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
 439         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
 440         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
 441         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
 442         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
 443         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
 444         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
 445         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
 446         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
 447         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
 448 };
 449
 450 /*
 451  * Convert DOS char to Local char
 452  */
 453 static u_int16_t
 454 dos2unixchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *
 455 pmp)
 456 {
 457         u_char c;
 458         char *outp, outbuf[3];
 459         u_int16_t wc;
 460         size_t len, olen;
 461         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
 462                 olen = len = 2;
 463                 outp = outbuf;
 464                 if (lower & (LCASE_BASE | LCASE_EXT))
 465                         msdos_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
 466                                                   ilen, &outp, &olen, KICONV_LOWER);
 467                 else
 468                         msdos_iconv->convchr(pmp->pm_d2u, (const char **)instr,
 469                                              ilen, &outp, &olen);
 470                 len -= olen;
 471                 /*
 472                  * return '?' if failed to convert
 473                  */
 474                 if (len == 0) {
 475                         (*ilen)--;
 476                         (*instr)++;
 477                         return ('?');
 478                 }
 479                 wc = 0;
 480                 while(len--)
 481                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
 482                 return (wc);
 483         }
 484         (*ilen)--;
 485         c = *(*instr)++;
 486         c = dos2unix[c];
 487         if (lower & (LCASE_BASE | LCASE_EXT))
 488                 c = u2l[c];
 489         return ((u_int16_t)c);
 490 }
 491
 492 /*
 493  * DOS filenames are made of 2 parts, the name part and the extension part.
 494  * The name part is 8 characters long and the extension part is 3
 495  * characters long.  They may contain trailing blanks if the name or
 496  * extension are not long enough to fill their respective fields.
 497  */
 498
 499 /*
 500  * Convert a DOS filename to a unix filename. And, return the number of
 501  * characters in the resulting unix filename excluding the terminating
 502  * null.
 503  */
 504 int
 505 dos2unixfn(u_char dn[11], u_char *un, int lower, struct msdosfsmount *pmp)
 506 {
 507         int i;
 508         int thislong = 1;
 509         u_char c;
 510
 511         /*
 512          * If first char of the filename is SLOT_E5 (0x05), then the real
 513          * first char of the filename should be 0xe5. But, they couldn't
 514          * just have a 0xe5 mean 0xe5 because that is used to mean a freed
 515          * directory slot. Another dos quirk.
 516          */
 517         if (*dn == SLOT_E5)
 518                 *dn = 0xe5;
 519         /*
 520          * Copy the name portion into the unix filename string.
 521          */
 522         for(i  = 8; i > 0 && *dn != ' ';) {
 523                 c = dos2unixchr((const u_char **)&dn, &i, lower & LCASE_BASE,
 524                     pmp);
 525                 if (c & 0xff00) {
 526                         *un++ = c >> 8;
 527                         thislong++;
 528                 }
 529                 *un++ = c;
 530                 thislong++;
 531         }
 532         dn += i;
 533
 534         /*
 535          * Now, if there is an extension then put in a period and copy in
 536          * the extension.
 537          */
 538          if (*dn != ' ') {
 539                 *un++ = '.';
 540                 thislong++;
 541                 for (i = 3; i > 0 && *dn != ' ';) {
 542                         c = dos2unixchr((const u_char **)&dn, &i,
 543                             lower & LCASE_EXT, pmp);
 544                         if (c & 0xff00) {
 545                                 *un++ = c >> 8;
 546                                 thislong++;
 547                         }
 548                         *un++ = c;
 549                         thislong++;
 550                 }
 551         }
 552         *un++ = 0;
 553 /*
 554         for(i = 0; un[i] != 0; i++)
 555                 kprintf("0x%x", un[i]);
 556         kprintf(" ->%s\n", dn);
 557 */
 558         return (thislong);
 559 }
 560
 561 /*
 562  * Store an area with multi byte string instr, and reterns left
 563  * byte of instr and moves pointer forward. The area's size is
 564  * inlen or outlen.
 565  */
 566 static int
 567 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag,
 568  void *handle)
 569 {
 570         char *outp, outstr[outlen * weight + 1];
 571         bzero(outstr, outlen*weight+1);
 572         if (flag & MSDOSFSMNT_KICONV && msdos_iconv) {
 573                 outp = outstr;
 574                 outlen *= weight;
 575                 msdos_iconv->conv(handle, instr, &inlen, &outp, &outlen);
 576                 return (inlen);
 577         }
 578         (*instr) += min(inlen, outlen);
 579         return (inlen - min(inlen, outlen));
 580 }
 581
 582 /*
 583  * Convert Local char to DOS char
 584  */
 585 static u_int16_t
 586 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
 587 {
 588         u_char c;
 589         char *up, *outp, unicode[3], outbuf[3];
 590         u_int16_t wc;
 591         size_t len, ucslen, unixlen, olen;
 592         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
 593                 /*
 594                  * to hide an invisible character, using a unicode filter
 595                  */
 596                 ucslen = 2;
 597                 len = *ilen;
 598                 up = unicode;
 599                 msdos_iconv->convchr(pmp->pm_u2w, (const char **)instr,
 600                                      ilen, &up, &ucslen);
 601                 unixlen = len - *ilen;
 602
 603                 /*
 604                  * cannot be converted
 605                  */
 606                 if (unixlen == 0) {
 607                         (*ilen)--;
 608                         (*instr)++;
 609                         return (0);
 610                 }
 611                 /*
 612                  * return magic number for ascii char
 613                  */
 614                 if (unixlen == 1) {
 615                         c = *(*instr -1);
 616                         if (! (c & 0x80)) {
 617                                 c = unix2dos[c];
 618                                 if (c <= 2)
 619                                         return (c);
 620                         }
 621                 }
 622                 /*
 623                  * now convert using libiconv
 624                  */
 625                 *instr -= unixlen;
 626                 *ilen = len;
 627                 olen = len = 2;
 628                 outp = outbuf;
 629                 msdos_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
 630                                           ilen, &outp, &olen, KICONV_FROM_UPPER);
 631                 len -= olen;
 632                 /*
 633                  * cannot be converted, but has unicode char, should return magic number
 634                  */
 635                 if (len == 0) {
 636                         (*ilen) -= unixlen;
 637                         (*instr) += unixlen;
 638                         return (1);
 639                 }
 640                 wc = 0;
 641                 while(len--)
 642                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
 643  return (wc);
 644         }
 645         (*ilen)--;
 646         c = *(*instr)++;
 647         c = l2u[c];
 648         c = unix2dos[c];
 649         return ((u_int16_t)c);
 650 }
 651
 652 /*
 653  * Convert a unix filename to a DOS filename according to Win95 rules.
 654  * If applicable and gen is not 0, it is inserted into the converted
 655  * filename as a generation number.
 656  * Returns
 657  *      0 if name couldn't be converted
 658  *      1 if the converted name is the same as the original
 659  *        (no long filename entry necessary for Win95)
 660  *      2 if conversion was successful
 661  *      3 if conversion was successful and generation number was inserted
 662  */
 663
 664 int
 665 unix2dosfn(const u_char *un, u_char dn[12], int unlen, u_int gen, struct msdosfsmount *pmp)
 666 {
 667         ssize_t i, j;
 668         int l;
 669         int conv = 1;
 670         const u_char *cp, *dp, *dp1;
 671         u_char gentext[6], *wcp;
 672         u_int16_t c;
 673         /*
 674          * Fill the dos filename string with blanks. These are DOS's pad
 675          * characters.
 676          */
 677         for (i = 0; i < 11; i++)
 678                 dn[i] = ' ';
 679         dn[11] = 0;
 680         /*
 681          * The filenames "." and ".." are handled specially, since they
 682          * don't follow dos filename rules.
 683          */
 684         if (un[0] == '.' && unlen == 1) {
 685                 dn[0] = '.';
 686                 return gen <= 1;
 687         }
 688         if (un[0] == '.' && un[1] == '.' && unlen == 2) {
 689                 dn[0] = '.';
 690                 dn[1] = '.';
 691                 return gen <= 1;
 692         }
 693         /*
 694          * Filenames with only blanks and dots are not allowed!
 695          */
 696         for (cp = un, i = unlen; --i >= 0; cp++)
 697                 if (*cp != ' ' && *cp != '.')
 698                         break;
 699         if (i < 0)
 700                 return 0;
 701         /*
 702          * Filenames with some characters are not allowed!
 703          */
 704         for (cp = un, i = unlen; i > 0;)
 705                 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
 706                         return 0;
 707         /*
 708          * Now find the extension
 709          * Note: dot as first char doesn't start extension
 710          *       and trailing dots and blanks are ignored
 711          * Note(2003/7): It seems recent Windows has
 712          *       defferent rule than this code, that Windows
 713          *       ignores all dots before extension, and use all
 714          *       chars as filename except for dots.
 715          */
 716         dp = dp1 = 0;
 717         for (cp = un + 1, i = unlen - 1; --i >= 0;) {
 718                 switch (*cp++) {
 719                 case '.':
 720                         if (!dp1)
 721                                 dp1 = cp;
 722                         break;
 723                 case ' ':
 724                         break;
 725                 default:
 726                         if (dp1)
 727                                 dp = dp1;
 728                         dp1 = 0;
 729                         break;
 730                 }
 731         }
 732         /*
 733          * Now convert it (this part is for extension).
 734          * As Windows XP do, if it's not ascii char,
 735          * this function should return 2 or 3, so that checkng out Unicode name.
 736          */
 737         if (dp) {
 738                 if (dp1)
 739                         l = dp1 - dp;
 740                 else
 741                         l = unlen - (dp - un);
 742                 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
 743                         c = unix2doschr(&cp, (size_t *)&i, pmp);
 744                         if (c & 0xff00) {
 745                                 dn[j] = c >> 8;
 746                                 if (++j < 11) {
 747                                         dn[j] = c;
 748                                         if (conv != 3)
 749                                                 conv = 2;
 750                                         continue;
 751                                 } else {
 752                                         conv = 3;
 753                                         dn[j-1] = ' ';
 754                                         break;
 755                                 }
 756                         } else {
 757                                 dn[j] = c;
 758                         }
 759                         if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
 760                                 conv = 2;
 761                         if (dn[j] == 1) {
 762                                 conv = 3;
 763                                 dn[j] = '_';
 764                         }
 765                         if (dn[j] == 2) {
 766                                 conv = 3;
 767                                 dn[j--] = ' ';
 768                         }
 769                 }
 770                 if (i > 0)
 771                         conv = 3;
 772                 dp--;
 773         } else {
 774                 for (dp = cp; *--dp == ' ' || *dp == '.';);
 775                 dp++;
 776         }
 777         /*
 778          * Now convert the rest of the name
 779          */
 780         for (i = dp - un, j = 0; un < dp && j < 8; j++) {
 781                 c = unix2doschr(&un, &i, pmp);
 782                 if (c & 0xff00) {
 783                         dn[j] = c >> 8;
 784                         if (++j < 8) {
 785                                 dn[j] = c;
 786                                 if (conv != 3)
 787                                         conv = 2;
 788                                 continue;
 789                         } else {
 790                                 conv = 3;
 791                                 dn[j-1] = ' ';
 792                                 break;
 793                         }
 794                 } else {
 795                         dn[j] = c;
 796                 }
 797                 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
 798                         conv = 2;
 799                 if (dn[j] == 1) {
 800                         conv = 3;
 801                         dn[j] = '_';
 802                 }
 803                 if (dn[j] == 2) {
 804                         conv = 3;
 805                         dn[j--] = ' ';
 806                 }
 807         }
 808         if (un < dp)
 809                 conv = 3;
 810         /*
 811          * If we didn't have any chars in filename,
 812          * generate a default
 813          */
 814         if (!j)
 815                 dn[0] = '_';
 816         /*
 817          * If there wasn't any char dropped,
 818          * there is no place for generation numbers
 819          */
 820         if (conv != 3) {
 821                 if (gen > 1)
 822                         conv = 0;
 823                 goto done;
 824         }
 825         /*
 826          * Now insert the generation number into the filename part
 827          */
 828         if (gen == 0)
 829                 goto done;
 830         for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
 831                 *--wcp = gen % 10 + '0';
 832         if (gen) {
 833                 conv = 0;
 834                 goto done;
 835         }
 836         for (i = 8; dn[--i] == ' ';);
 837         i++;
 838         if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
 839                 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
 840         /*
 841          * Correct posision to where insert the generation number
 842          */
 843         cp = dn;
 844         i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
 845         dn[i++] = '~';
 846         while (wcp < gentext + sizeof(gentext))
 847                 dn[i++] = *wcp++;
 848         /*
 849          * Tail of the filename should be space
 850          */
 851         while (i < 8)
 852                 dn[i++] = ' ';
 853         conv = 3;
 854 done:
 855         /*
 856          * The first character cannot be E5,
 857          * because that means a deleted entry
 858          */
 859         if (dn[0] == 0xe5)
 860                 dn[0] = SLOT_E5;
 861         return conv;
 862 }
 863
 864 /*
 865  * Convert Local char to Windows char
 866  */
 867 static u_int16_t
 868 unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *
 869 pmp)
 870 {
 871         u_char *outp, outbuf[3];
 872         u_int16_t wc;
 873         size_t olen;
 874         if (*ilen == 0)
 875                 return (0);
 876         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
 877                 outp = outbuf;
 878                 olen = 2;
 879                 if (lower & (LCASE_BASE | LCASE_EXT))
 880                         msdos_iconv->convchr_case(pmp->pm_u2w, (const char **)
 881 instr,
 882                                                   ilen, (char **)&outp, &olen,
 883                                                   KICONV_FROM_LOWER);
 884                 else
 885                         msdos_iconv->convchr(pmp->pm_u2w, (const char **)instr,
 886                                              ilen, (char **)&outp, &olen);
 887                 /*
 888                  * return '0' if end of filename
 889                  */
 890                 if (olen == 2)
 891                         return (0);
 892                 wc = (outbuf[0]<<8) | outbuf[1];
 893                 return (wc);
 894         }
 895         (*ilen)--;
 896         wc = (*instr)[0];
 897         if (lower & (LCASE_BASE | LCASE_EXT))
 898                 wc = u2l[wc];
 899         (*instr)++;
 900         return (wc);
 901 }
 902
 903 /*
 904  * Create a Win95 long name directory entry
 905  * Note: assumes that the filename is valid,
 906  *       i.e. doesn't consist solely of blanks and dots
 907  */
 908 int
 909 unix2winfn(const u_char *un, int unlen, struct winentry *wep, int cnt, int chksum, struct msdosfsmount *pmp)
 910 {
 911         u_int8_t *wcp;
 912         int i, end;
 913         u_int16_t code;
 914
 915         /*
 916          * Drop trailing blanks and dots
 917          */
 918         unlen = winLenFixup(un, unlen);
 919
 920         /*
 921          * Cut *un for this slot
 922          */
 923         unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
 924                           pmp->pm_flags, pmp->pm_u2w);
 925
 926         /*
 927          * Initialize winentry to some useful default
 928          */
 929         for (wcp = (u_int8_t *)wep, i = sizeof(*wep); --i >= 0; *wcp++ = 0xff);
 930         wep->weCnt = cnt;
 931         wep->weAttributes = ATTR_WIN95;
 932         wep->weReserved1 = 0;
 933         wep->weChksum = chksum;
 934         wep->weReserved2 = 0;
 935
 936         /*
 937          * Now convert the filename parts
 938          */
 939         end = 0;
 940         for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;)
 941         {
 942                 code = unix2winchr(&un, &unlen, 0, pmp);
 943                 *wcp++ = code;
 944                 *wcp++ = code >> 8;
 945                 if (!code)
 946                         end = WIN_LAST;
 947         }
 948         for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;)
 949         {
 950                 code = unix2winchr(&un, &unlen, 0, pmp);
 951                 *wcp++ = code;
 952                 *wcp++ = code >> 8;
 953                 if (!code)
 954                         end = WIN_LAST;
 955         }
 956         for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;)
 957         {
 958                 code = unix2winchr(&un, &unlen, 0, pmp);
 959                 *wcp++ = code;
 960                 *wcp++ = code >> 8;
 961                 if (!code)
 962                         end = WIN_LAST;
 963         }
 964         if (*un == '\0')
 965                 end = WIN_LAST;
 966         wep->weCnt |= end;
 967         return !end;
 968 }
 969
 970 static __inline u_int8_t
 971 find_lcode(u_int16_t code, u_int16_t *u2w)
 972 {
 973         int i;
 974
 975         for (i = 0; i < 128; i++)
 976                 if (u2w[i] == code)
 977                         return (i | 0x80);
 978         return '?';
 979 }
 980
 981 /*
 982  * Compare our filename to the one in the Win95 entry
 983  * Returns the checksum or -1 if no match
 984  */
 985 int
 986 winChkName(struct mbnambuf *nbp, const u_char *un, size_t unlen, int chksum,
 987     struct msdosfsmount *pmp)
 988 {
 989         size_t len;
 990         u_int16_t c1, c2;
 991         u_char *np;
 992         u_int16_t d_namlen;
 993         char d_name[127];
 994         bzero(d_name, 127);
 995         /*
 996          * We already have winentry in *nbp.
 997          */
 998         if (!mbnambuf_flush(nbp, d_name, &d_namlen) || d_namlen == 0)
 999                 return -1;
1000 #ifdef MSDOSFS_DEBUG
1001         kprintf("winChkName(): un=%s:%d,d_name=%s:%d\n", un, unlen,
1002                                                         d_name,
1003                                                         d_namlen);
1004 #endif
1005         /*
1006          * Compare the name parts
1007          */
1008         len = d_namlen;
1009         if (unlen != len)
1010                 return -2;
1011         for (np = d_name; unlen > 0 && len > 0;) {
1012                 /*
1013                  * Comparison must be case insensitive, because FAT disallows
1014                  * to look up or create files in case sensitive even when
1015                  * it's a long file name.
1016                  */
1017                 c1 = unix2winchr((const u_char **)&np, &len, LCASE_BASE, pmp);
1018                 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
1019                 if (c1 != c2)
1020                         return -2;
1021         }
1022         return chksum;
1023 }
1024
1025 /*
1026  * Convert Windows char to Local char
1027  */
1028 static u_int16_t
1029 win2unixchr(u_int16_t wc, struct msdosfsmount *pmp)
1030 {
1031         u_char *inp, *outp, inbuf[3], outbuf[3];
1032         size_t ilen, olen, len;
1033         if (wc == 0)
1034                 return (0);
1035         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
1036                 inbuf[0] = (u_char)(wc>>8);
1037                 inbuf[1] = (u_char)wc;
1038                 inbuf[2] = '\0';
1039                 ilen = olen = len = 2;
1040                 inp = inbuf;
1041                 outp = outbuf;
1042                 msdos_iconv->convchr(pmp->pm_w2u, (const char **)&inp, &ilen,
1043                                      (char **)&outp, &olen);
1044                 len -= olen;
1045
1046                 /*
1047                  * return '?' if failed to convert
1048                  */
1049                 if (len == 0) {
1050                         wc = '?';
1051                         return (wc);
1052                 }
1053                 wc = 0;
1054                 while(len--)
1055                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
1056                 return (wc);
1057         }
1058         if (wc & 0xff00)
1059                 wc = '?';
1060         return (wc);
1061 }
1062
1063 /*
1064  * Convert Win95 filename to dirbuf.
1065  * Returns the checksum or -1 if impossible
1066  */
1067 int
1068 win2unixfn(struct mbnambuf *nbp, struct winentry *wep, int chksum,
1069     struct msdosfsmount *pmp)
1070 {
1071         u_int8_t *cp;
1072         u_int8_t *np, name[WIN_CHARS * 2 + 1];
1073         u_int16_t code;
1074         int i;
1075         if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
1076             || !(wep->weCnt&WIN_CNT))
1077                 return -1;
1078         /*
1079          * First compare checksums
1080          */
1081         if (wep->weCnt&WIN_LAST) {
1082                 chksum = wep->weChksum;
1083         } else if (chksum != wep->weChksum)
1084                 chksum = -1;
1085         if (chksum == -1)
1086                 return -1;
1087         /*
1088          * Convert the name parts
1089          */
1090         np = name;
1091         for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
1092                 code = (cp[1] << 8) | cp[0];
1093                 switch (code) {
1094                 case 0:
1095                         *np = '\0';
1096                         mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
1097                         return chksum;
1098                 case '/':
1099                         *np = '\0';
1100                         return -1;
1101                 default:
1102                         code = win2unixchr(code, pmp);
1103                         if (code & 0xff00)
1104                                 *np++ = code >> 8;
1105                         *np++ = code;
1106                         break;
1107                 }
1108                 cp += 2;
1109         }
1110         for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
1111                 code = (cp[1] << 8) | cp[0];
1112                 switch (code) {
1113                 case 0:
1114                         *np = '\0';
1115                         mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
1116                         return chksum;
1117                 case '/':
1118                         *np = '\0';
1119                         return -1;
1120                 default:
1121                         code = win2unixchr(code, pmp);
1122                         if (code & 0xff00)
1123                                 *np++ = code >> 8;
1124                         *np++ = code;
1125                         break;
1126                 }
1127                 cp += 2;
1128         }
1129         for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
1130                 code = (cp[1] << 8) | cp[0];
1131                 switch (code) {
1132                 case 0:
1133                         *np = '\0';
1134                         mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
1135                         return chksum;
1136                 case '/':
1137                         *np = '\0';
1138                         return -1;
1139                 default:
1140                         code = win2unixchr(code, pmp);
1141                         if (code & 0xff00)
1142                                 *np++ = code >> 8;
1143                         *np++ = code;
1144                         break;
1145                 }
1146                 cp += 2;
1147         }
1148         *np = '\0';
1149         mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
1150         return chksum;
1151 }
1152 /*
1153  * Compute the checksum of a DOS filename for Win95 use
1154  */
1155 u_int8_t
1156 winChksum(u_int8_t *name)
1157 {
1158         int i;
1159         u_int8_t s;
1160
1161         for (s = 0, i = 11; --i >= 0; s += *name++)
1162                 s = (s << 7)|(s >> 1);
1163         return s;
1164 }
1165
1166 /*
1167  * Determine the number of slots necessary for Win95 names
1168  */
1169 int
1170 winSlotCnt(const u_char *un, int unlen, struct msdosfsmount *pmp)
1171 {
1172         size_t wlen;
1173         char wn[WIN_MAXLEN * 2 + 1], *wnp;
1174         unlen = winLenFixup(un, unlen);
1175         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
1176                 wlen = WIN_MAXLEN * 2;
1177                 wnp = wn;
1178                 msdos_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
1179                 if (unlen > 0)
1180                         return 0;
1181                 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
1182         }
1183         if (unlen > WIN_MAXLEN)
1184                 return 0;
1185          return howmany(unlen, WIN_CHARS);
1186 }
1187
1188 /*
1189  * Determine the number of bytes neccesary for Win95 names
1190  */
1191 int
1192 winLenFixup(const u_char *un, int unlen)
1193 {
1194         for (un += unlen; unlen > 0; unlen--)
1195                 if (*--un != ' ' && *un != '.')
1196                         break;
1197         return unlen;
1198 }