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 } 1199