| 1 |
/* |
| 2 |
* libhfs - library for reading and writing Macintosh HFS volumes |
| 3 |
* Copyright (C) 1996-1998 Robert Leslie |
| 4 |
* |
| 5 |
* This program is free software; you can redistribute it and/or modify |
| 6 |
* it under the terms of the GNU General Public License as published by |
| 7 |
* the Free Software Foundation; either version 2 of the License, or |
| 8 |
* (at your option) any later version. |
| 9 |
* |
| 10 |
* This program is distributed in the hope that it will be useful, |
| 11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 |
* GNU General Public License for more details. |
| 14 |
* |
| 15 |
* You should have received a copy of the GNU General Public License |
| 16 |
* along with this program; if not, write to the Free Software |
| 17 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 |
* |
| 19 |
*/ |
| 20 |
|
| 21 |
# ifdef HAVE_CONFIG_H |
| 22 |
# include "config.h" |
| 23 |
# endif |
| 24 |
|
| 25 |
# include <string.h> |
| 26 |
# include <errno.h> |
| 27 |
|
| 28 |
# include "libhfs.h" |
| 29 |
# include "file.h" |
| 30 |
# include "btree.h" |
| 31 |
# include "record.h" |
| 32 |
# include "volume.h" |
| 33 |
|
| 34 |
/* |
| 35 |
* NAME: file->init() |
| 36 |
* DESCRIPTION: initialize file structure |
| 37 |
*/ |
| 38 |
void f_init(hfsfile *file, hfsvol *vol, long cnid, const char *name) |
| 39 |
{ |
| 40 |
int i; |
| 41 |
|
| 42 |
file->vol = vol; |
| 43 |
file->parid = 0; |
| 44 |
|
| 45 |
strcpy(file->name, name); |
| 46 |
|
| 47 |
file->cat.cdrType = cdrFilRec; |
| 48 |
file->cat.cdrResrv2 = 0; |
| 49 |
|
| 50 |
file->cat.u.fil.filFlags = 0; |
| 51 |
file->cat.u.fil.filTyp = 0; |
| 52 |
|
| 53 |
file->cat.u.fil.filUsrWds.fdType = 0; |
| 54 |
file->cat.u.fil.filUsrWds.fdCreator = 0; |
| 55 |
file->cat.u.fil.filUsrWds.fdFlags = 0; |
| 56 |
file->cat.u.fil.filUsrWds.fdLocation.v = 0; |
| 57 |
file->cat.u.fil.filUsrWds.fdLocation.h = 0; |
| 58 |
file->cat.u.fil.filUsrWds.fdFldr = 0; |
| 59 |
|
| 60 |
file->cat.u.fil.filFlNum = cnid; |
| 61 |
file->cat.u.fil.filStBlk = 0; |
| 62 |
file->cat.u.fil.filLgLen = 0; |
| 63 |
file->cat.u.fil.filPyLen = 0; |
| 64 |
file->cat.u.fil.filRStBlk = 0; |
| 65 |
file->cat.u.fil.filRLgLen = 0; |
| 66 |
file->cat.u.fil.filRPyLen = 0; |
| 67 |
file->cat.u.fil.filCrDat = 0; |
| 68 |
file->cat.u.fil.filMdDat = 0; |
| 69 |
file->cat.u.fil.filBkDat = 0; |
| 70 |
|
| 71 |
file->cat.u.fil.filFndrInfo.fdIconID = 0; |
| 72 |
for (i = 0; i < 4; ++i) |
| 73 |
file->cat.u.fil.filFndrInfo.fdUnused[i] = 0; |
| 74 |
file->cat.u.fil.filFndrInfo.fdComment = 0; |
| 75 |
file->cat.u.fil.filFndrInfo.fdPutAway = 0; |
| 76 |
|
| 77 |
file->cat.u.fil.filClpSize = 0; |
| 78 |
|
| 79 |
for (i = 0; i < 3; ++i) |
| 80 |
{ |
| 81 |
file->cat.u.fil.filExtRec[i].xdrStABN = 0; |
| 82 |
file->cat.u.fil.filExtRec[i].xdrNumABlks = 0; |
| 83 |
|
| 84 |
file->cat.u.fil.filRExtRec[i].xdrStABN = 0; |
| 85 |
file->cat.u.fil.filRExtRec[i].xdrNumABlks = 0; |
| 86 |
} |
| 87 |
|
| 88 |
file->cat.u.fil.filResrv = 0; |
| 89 |
|
| 90 |
f_selectfork(file, fkData); |
| 91 |
|
| 92 |
file->flags = 0; |
| 93 |
|
| 94 |
file->prev = 0; |
| 95 |
file->next = 0; |
| 96 |
} |
| 97 |
|
| 98 |
/* |
| 99 |
* NAME: file->selectfork() |
| 100 |
* DESCRIPTION: choose a fork for file operations |
| 101 |
*/ |
| 102 |
void f_selectfork(hfsfile *file, int fork) |
| 103 |
{ |
| 104 |
file->fork = fork; |
| 105 |
|
| 106 |
memcpy(&file->ext, fork == fkData ? |
| 107 |
&file->cat.u.fil.filExtRec : &file->cat.u.fil.filRExtRec, |
| 108 |
sizeof(ExtDataRec)); |
| 109 |
|
| 110 |
file->fabn = 0; |
| 111 |
file->pos = 0; |
| 112 |
} |
| 113 |
|
| 114 |
/* |
| 115 |
* NAME: file->getptrs() |
| 116 |
* DESCRIPTION: make pointers to the current fork's lengths and extents |
| 117 |
*/ |
| 118 |
void f_getptrs(hfsfile *file, ExtDataRec **extrec, |
| 119 |
unsigned long **lglen, unsigned long **pylen) |
| 120 |
{ |
| 121 |
if (file->fork == fkData) |
| 122 |
{ |
| 123 |
if (extrec) |
| 124 |
*extrec = &file->cat.u.fil.filExtRec; |
| 125 |
if (lglen) |
| 126 |
*lglen = &file->cat.u.fil.filLgLen; |
| 127 |
if (pylen) |
| 128 |
*pylen = &file->cat.u.fil.filPyLen; |
| 129 |
} |
| 130 |
else |
| 131 |
{ |
| 132 |
if (extrec) |
| 133 |
*extrec = &file->cat.u.fil.filRExtRec; |
| 134 |
if (lglen) |
| 135 |
*lglen = &file->cat.u.fil.filRLgLen; |
| 136 |
if (pylen) |
| 137 |
*pylen = &file->cat.u.fil.filRPyLen; |
| 138 |
} |
| 139 |
} |
| 140 |
|
| 141 |
/* |
| 142 |
* NAME: file->doblock() |
| 143 |
* DESCRIPTION: read or write a numbered block from a file |
| 144 |
*/ |
| 145 |
int f_doblock(hfsfile *file, unsigned long num, block *bp, |
| 146 |
int (*func)(hfsvol *, unsigned int, unsigned int, block *)) |
| 147 |
{ |
| 148 |
unsigned int abnum; |
| 149 |
unsigned int blnum; |
| 150 |
unsigned int fabn; |
| 151 |
int i; |
| 152 |
|
| 153 |
abnum = num / file->vol->lpa; |
| 154 |
blnum = num % file->vol->lpa; |
| 155 |
|
| 156 |
/* locate the appropriate extent record */ |
| 157 |
|
| 158 |
fabn = file->fabn; |
| 159 |
|
| 160 |
if (abnum < fabn) |
| 161 |
{ |
| 162 |
ExtDataRec *extrec; |
| 163 |
|
| 164 |
f_getptrs(file, &extrec, 0, 0); |
| 165 |
|
| 166 |
fabn = file->fabn = 0; |
| 167 |
memcpy(&file->ext, extrec, sizeof(ExtDataRec)); |
| 168 |
} |
| 169 |
else |
| 170 |
abnum -= fabn; |
| 171 |
|
| 172 |
while (1) |
| 173 |
{ |
| 174 |
unsigned int n; |
| 175 |
|
| 176 |
for (i = 0; i < 3; ++i) |
| 177 |
{ |
| 178 |
n = file->ext[i].xdrNumABlks; |
| 179 |
|
| 180 |
if (abnum < n) |
| 181 |
return func(file->vol, file->ext[i].xdrStABN + abnum, blnum, bp); |
| 182 |
|
| 183 |
fabn += n; |
| 184 |
abnum -= n; |
| 185 |
} |
| 186 |
|
| 187 |
if (v_extsearch(file, fabn, &file->ext, 0) <= 0) |
| 188 |
goto fail; |
| 189 |
|
| 190 |
file->fabn = fabn; |
| 191 |
} |
| 192 |
|
| 193 |
fail: |
| 194 |
return -1; |
| 195 |
} |
| 196 |
|
| 197 |
/* |
| 198 |
* NAME: file->addextent() |
| 199 |
* DESCRIPTION: add an extent to a file |
| 200 |
*/ |
| 201 |
int f_addextent(hfsfile *file, ExtDescriptor *blocks) |
| 202 |
{ |
| 203 |
hfsvol *vol = file->vol; |
| 204 |
ExtDataRec *extrec; |
| 205 |
unsigned long *pylen; |
| 206 |
unsigned int start, end; |
| 207 |
node n; |
| 208 |
int i; |
| 209 |
|
| 210 |
f_getptrs(file, &extrec, 0, &pylen); |
| 211 |
|
| 212 |
start = file->fabn; |
| 213 |
end = *pylen / vol->mdb.drAlBlkSiz; |
| 214 |
|
| 215 |
n.nnum = 0; |
| 216 |
i = -1; |
| 217 |
|
| 218 |
while (start < end) |
| 219 |
{ |
| 220 |
for (i = 0; i < 3; ++i) |
| 221 |
{ |
| 222 |
unsigned int num; |
| 223 |
|
| 224 |
num = file->ext[i].xdrNumABlks; |
| 225 |
start += num; |
| 226 |
|
| 227 |
if (start == end) |
| 228 |
break; |
| 229 |
else if (start > end) |
| 230 |
ERROR(EIO, "file extents exceed file physical length"); |
| 231 |
else if (num == 0) |
| 232 |
ERROR(EIO, "empty file extent"); |
| 233 |
} |
| 234 |
|
| 235 |
if (start == end) |
| 236 |
break; |
| 237 |
|
| 238 |
if (v_extsearch(file, start, &file->ext, &n) <= 0) |
| 239 |
goto fail; |
| 240 |
|
| 241 |
file->fabn = start; |
| 242 |
} |
| 243 |
|
| 244 |
if (i >= 0 && |
| 245 |
file->ext[i].xdrStABN + file->ext[i].xdrNumABlks == blocks->xdrStABN) |
| 246 |
file->ext[i].xdrNumABlks += blocks->xdrNumABlks; |
| 247 |
else |
| 248 |
{ |
| 249 |
/* create a new extent descriptor */ |
| 250 |
|
| 251 |
if (++i < 3) |
| 252 |
file->ext[i] = *blocks; |
| 253 |
else |
| 254 |
{ |
| 255 |
ExtKeyRec key; |
| 256 |
byte record[HFS_MAX_EXTRECLEN]; |
| 257 |
unsigned int reclen; |
| 258 |
|
| 259 |
/* record is full; create a new one */ |
| 260 |
|
| 261 |
file->ext[0] = *blocks; |
| 262 |
|
| 263 |
for (i = 1; i < 3; ++i) |
| 264 |
{ |
| 265 |
file->ext[i].xdrStABN = 0; |
| 266 |
file->ext[i].xdrNumABlks = 0; |
| 267 |
} |
| 268 |
|
| 269 |
file->fabn = start; |
| 270 |
|
| 271 |
r_makeextkey(&key, file->fork, file->cat.u.fil.filFlNum, end); |
| 272 |
r_packextrec(&key, &file->ext, record, &reclen); |
| 273 |
|
| 274 |
if (bt_insert(&vol->ext, record, reclen) == -1) |
| 275 |
goto fail; |
| 276 |
|
| 277 |
i = -1; |
| 278 |
} |
| 279 |
} |
| 280 |
|
| 281 |
if (i >= 0) |
| 282 |
{ |
| 283 |
/* store the modified extent record */ |
| 284 |
|
| 285 |
if (file->fabn) |
| 286 |
{ |
| 287 |
if ((n.nnum == 0 && |
| 288 |
v_extsearch(file, file->fabn, 0, &n) <= 0) || |
| 289 |
v_putextrec(&file->ext, &n) == -1) |
| 290 |
goto fail; |
| 291 |
} |
| 292 |
else |
| 293 |
memcpy(extrec, &file->ext, sizeof(ExtDataRec)); |
| 294 |
} |
| 295 |
|
| 296 |
*pylen += blocks->xdrNumABlks * vol->mdb.drAlBlkSiz; |
| 297 |
|
| 298 |
file->flags |= HFS_FILE_UPDATE_CATREC; |
| 299 |
|
| 300 |
return 0; |
| 301 |
|
| 302 |
fail: |
| 303 |
return -1; |
| 304 |
} |
| 305 |
|
| 306 |
/* |
| 307 |
* NAME: file->alloc() |
| 308 |
* DESCRIPTION: reserve allocation blocks for a file |
| 309 |
*/ |
| 310 |
long f_alloc(hfsfile *file) |
| 311 |
{ |
| 312 |
hfsvol *vol = file->vol; |
| 313 |
unsigned long clumpsz; |
| 314 |
ExtDescriptor blocks; |
| 315 |
|
| 316 |
clumpsz = file->cat.u.fil.filClpSize; |
| 317 |
if (clumpsz == 0) |
| 318 |
{ |
| 319 |
if (file == &vol->ext.f) |
| 320 |
clumpsz = vol->mdb.drXTClpSiz; |
| 321 |
else if (file == &vol->cat.f) |
| 322 |
clumpsz = vol->mdb.drCTClpSiz; |
| 323 |
else |
| 324 |
clumpsz = vol->mdb.drClpSiz; |
| 325 |
} |
| 326 |
|
| 327 |
blocks.xdrNumABlks = clumpsz / vol->mdb.drAlBlkSiz; |
| 328 |
|
| 329 |
if (v_allocblocks(vol, &blocks) == -1) |
| 330 |
goto fail; |
| 331 |
|
| 332 |
if (f_addextent(file, &blocks) == -1) |
| 333 |
{ |
| 334 |
v_freeblocks(vol, &blocks); |
| 335 |
goto fail; |
| 336 |
} |
| 337 |
|
| 338 |
return blocks.xdrNumABlks; |
| 339 |
|
| 340 |
fail: |
| 341 |
return -1; |
| 342 |
} |
| 343 |
|
| 344 |
/* |
| 345 |
* NAME: file->trunc() |
| 346 |
* DESCRIPTION: release allocation blocks unneeded by a file |
| 347 |
*/ |
| 348 |
int f_trunc(hfsfile *file) |
| 349 |
{ |
| 350 |
hfsvol *vol = file->vol; |
| 351 |
ExtDataRec *extrec; |
| 352 |
unsigned long *lglen, *pylen, alblksz, newpylen; |
| 353 |
unsigned int dlen, start, end; |
| 354 |
node n; |
| 355 |
int i; |
| 356 |
|
| 357 |
if (vol->flags & HFS_VOL_READONLY) |
| 358 |
goto done; |
| 359 |
|
| 360 |
f_getptrs(file, &extrec, &lglen, &pylen); |
| 361 |
|
| 362 |
alblksz = vol->mdb.drAlBlkSiz; |
| 363 |
newpylen = (*lglen / alblksz + (*lglen % alblksz != 0)) * alblksz; |
| 364 |
|
| 365 |
if (newpylen > *pylen) |
| 366 |
ERROR(EIO, "file size exceeds physical length"); |
| 367 |
else if (newpylen == *pylen) |
| 368 |
goto done; |
| 369 |
|
| 370 |
dlen = (*pylen - newpylen) / alblksz; |
| 371 |
|
| 372 |
start = file->fabn; |
| 373 |
end = newpylen / alblksz; |
| 374 |
|
| 375 |
if (start >= end) |
| 376 |
{ |
| 377 |
start = file->fabn = 0; |
| 378 |
memcpy(&file->ext, extrec, sizeof(ExtDataRec)); |
| 379 |
} |
| 380 |
|
| 381 |
n.nnum = 0; |
| 382 |
i = -1; |
| 383 |
|
| 384 |
while (start < end) |
| 385 |
{ |
| 386 |
for (i = 0; i < 3; ++i) |
| 387 |
{ |
| 388 |
unsigned int num; |
| 389 |
|
| 390 |
num = file->ext[i].xdrNumABlks; |
| 391 |
start += num; |
| 392 |
|
| 393 |
if (start >= end) |
| 394 |
break; |
| 395 |
else if (num == 0) |
| 396 |
ERROR(EIO, "empty file extent"); |
| 397 |
} |
| 398 |
|
| 399 |
if (start >= end) |
| 400 |
break; |
| 401 |
|
| 402 |
if (v_extsearch(file, start, &file->ext, &n) <= 0) |
| 403 |
goto fail; |
| 404 |
|
| 405 |
file->fabn = start; |
| 406 |
} |
| 407 |
|
| 408 |
if (start > end) |
| 409 |
{ |
| 410 |
ExtDescriptor blocks; |
| 411 |
|
| 412 |
file->ext[i].xdrNumABlks -= start - end; |
| 413 |
dlen -= start - end; |
| 414 |
|
| 415 |
blocks.xdrStABN = file->ext[i].xdrStABN + file->ext[i].xdrNumABlks; |
| 416 |
blocks.xdrNumABlks = start - end; |
| 417 |
|
| 418 |
if (v_freeblocks(vol, &blocks) == -1) |
| 419 |
goto fail; |
| 420 |
} |
| 421 |
|
| 422 |
*pylen = newpylen; |
| 423 |
|
| 424 |
file->flags |= HFS_FILE_UPDATE_CATREC; |
| 425 |
|
| 426 |
do |
| 427 |
{ |
| 428 |
while (dlen && ++i < 3) |
| 429 |
{ |
| 430 |
unsigned int num; |
| 431 |
|
| 432 |
num = file->ext[i].xdrNumABlks; |
| 433 |
start += num; |
| 434 |
|
| 435 |
if (num == 0) |
| 436 |
ERROR(EIO, "empty file extent"); |
| 437 |
else if (num > dlen) |
| 438 |
ERROR(EIO, "file extents exceed physical size"); |
| 439 |
|
| 440 |
dlen -= num; |
| 441 |
|
| 442 |
if (v_freeblocks(vol, &file->ext[i]) == -1) |
| 443 |
goto fail; |
| 444 |
|
| 445 |
file->ext[i].xdrStABN = 0; |
| 446 |
file->ext[i].xdrNumABlks = 0; |
| 447 |
} |
| 448 |
|
| 449 |
if (file->fabn) |
| 450 |
{ |
| 451 |
if (n.nnum == 0 && |
| 452 |
v_extsearch(file, file->fabn, 0, &n) <= 0) |
| 453 |
goto fail; |
| 454 |
|
| 455 |
if (file->ext[0].xdrNumABlks) |
| 456 |
{ |
| 457 |
if (v_putextrec(&file->ext, &n) == -1) |
| 458 |
goto fail; |
| 459 |
} |
| 460 |
else |
| 461 |
{ |
| 462 |
if (bt_delete(&vol->ext, HFS_NODEREC(n, n.rnum)) == -1) |
| 463 |
goto fail; |
| 464 |
|
| 465 |
n.nnum = 0; |
| 466 |
} |
| 467 |
} |
| 468 |
else |
| 469 |
memcpy(extrec, &file->ext, sizeof(ExtDataRec)); |
| 470 |
|
| 471 |
if (dlen) |
| 472 |
{ |
| 473 |
if (v_extsearch(file, start, &file->ext, &n) <= 0) |
| 474 |
goto fail; |
| 475 |
|
| 476 |
file->fabn = start; |
| 477 |
i = -1; |
| 478 |
} |
| 479 |
} |
| 480 |
while (dlen); |
| 481 |
|
| 482 |
done: |
| 483 |
return 0; |
| 484 |
|
| 485 |
fail: |
| 486 |
return -1; |
| 487 |
} |
| 488 |
|
| 489 |
/* |
| 490 |
* NAME: file->flush() |
| 491 |
* DESCRIPTION: flush all pending changes to an open file |
| 492 |
*/ |
| 493 |
int f_flush(hfsfile *file) |
| 494 |
{ |
| 495 |
hfsvol *vol = file->vol; |
| 496 |
|
| 497 |
if (vol->flags & HFS_VOL_READONLY) |
| 498 |
goto done; |
| 499 |
|
| 500 |
if (file->flags & HFS_FILE_UPDATE_CATREC) |
| 501 |
{ |
| 502 |
node n; |
| 503 |
|
| 504 |
file->cat.u.fil.filStBlk = file->cat.u.fil.filExtRec[0].xdrStABN; |
| 505 |
file->cat.u.fil.filRStBlk = file->cat.u.fil.filRExtRec[0].xdrStABN; |
| 506 |
|
| 507 |
if (v_catsearch(vol, file->parid, file->name, 0, 0, &n) <= 0 || |
| 508 |
v_putcatrec(&file->cat, &n) == -1) |
| 509 |
goto fail; |
| 510 |
|
| 511 |
file->flags &= ~HFS_FILE_UPDATE_CATREC; |
| 512 |
} |
| 513 |
|
| 514 |
done: |
| 515 |
return 0; |
| 516 |
|
| 517 |
fail: |
| 518 |
return -1; |
| 519 |
} |
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