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[apple/hfs.git] / core / hfs_endian.c
1 /*
2 * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 /*
30 * hfs_endian.c
31 *
32 * This file implements endian swapping routines for the HFS/HFS Plus
33 * volume format.
34 */
35
36 #include "hfs_endian.h"
37 #include "hfs_dbg.h"
38 #include "BTreesPrivate.h"
39
40 #undef ENDIAN_DEBUG
41
42 /*
43 * Internal swapping routines
44 *
45 * These routines handle swapping the records of leaf and index nodes. The
46 * layout of the keys and records varies depending on the kind of B-tree
47 * (determined by fileID).
48 *
49 * The direction parameter must be kSwapBTNodeBigToHost or kSwapBTNodeHostToBig.
50 * The kSwapBTNodeHeaderRecordOnly "direction" is not valid for these routines.
51 */
52 int hfs_swap_HFSPlusBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, enum HFSBTSwapDirection direction);
53 void hfs_swap_HFSPlusForkData (HFSPlusForkData *src);
54
55 #if CONFIG_HFS_STD
56 int hfs_swap_HFSBTInternalNode (BlockDescriptor *src, HFSCatalogNodeID fileID, enum HFSBTSwapDirection direction);
57 #endif
58
59 /*
60 * hfs_swap_HFSPlusForkData
61 */
62 void
63 hfs_swap_HFSPlusForkData (
64 HFSPlusForkData *src
65 )
66 {
67 int i;
68
69 src->logicalSize = SWAP_BE64 (src->logicalSize);
70
71 src->clumpSize = SWAP_BE32 (src->clumpSize);
72 src->totalBlocks = SWAP_BE32 (src->totalBlocks);
73
74 for (i = 0; i < kHFSPlusExtentDensity; i++) {
75 src->extents[i].startBlock = SWAP_BE32 (src->extents[i].startBlock);
76 src->extents[i].blockCount = SWAP_BE32 (src->extents[i].blockCount);
77 }
78 }
79
80 /*
81 * hfs_swap_BTNode
82 *
83 * NOTE: This operation is not naturally symmetric.
84 * We have to determine which way we're swapping things.
85 */
86 int
87 hfs_swap_BTNode (
88 BlockDescriptor *src,
89 vnode_t vp,
90 enum HFSBTSwapDirection direction,
91 u_int8_t allow_empty_node
92 )
93 {
94 BTNodeDescriptor *srcDesc = src->buffer;
95 u_int16_t *srcOffs = NULL;
96 BTreeControlBlockPtr btcb = (BTreeControlBlockPtr)VTOF(vp)->fcbBTCBPtr;
97 u_int16_t i; /* index to match srcDesc->numRecords */
98 int error = 0;
99
100 #ifdef ENDIAN_DEBUG
101 if (direction == kSwapBTNodeBigToHost) {
102 printf ("hfs: BE -> Native Swap\n");
103 } else if (direction == kSwapBTNodeHostToBig) {
104 printf ("hfs: Native -> BE Swap\n");
105 } else if (direction == kSwapBTNodeHeaderRecordOnly) {
106 printf ("hfs: Not swapping descriptors\n");
107 } else {
108 panic ("hfs_swap_BTNode: This is impossible");
109 }
110 #endif
111
112 /*
113 * If we are doing a swap from on-disk to in-memory, then swap the node
114 * descriptor and record offsets before we need to use them.
115 */
116 if (direction == kSwapBTNodeBigToHost) {
117 srcDesc->fLink = SWAP_BE32 (srcDesc->fLink);
118 srcDesc->bLink = SWAP_BE32 (srcDesc->bLink);
119
120 /*
121 * When first opening a BTree, we have to read the header node before the
122 * control block is initialized. In this case, totalNodes will be zero,
123 * so skip the bounds checking. Also, we should ignore the header node when
124 * checking for invalid forwards and backwards links, since the header node's
125 * links can point back to itself legitimately.
126 */
127 if (btcb->totalNodes != 0) {
128 if (srcDesc->fLink >= btcb->totalNodes) {
129 hfs_corruption_debug("hfs_swap_BTNode: invalid forward link (0x%08x >= 0x%08x)\n", srcDesc->fLink, btcb->totalNodes);
130 error = fsBTInvalidHeaderErr;
131 goto fail;
132 }
133 if (srcDesc->bLink >= btcb->totalNodes) {
134 hfs_corruption_debug("hfs_swap_BTNode: invalid backward link (0x%08x >= 0x%08x)\n", srcDesc->bLink, btcb->totalNodes);
135 error = fsBTInvalidHeaderErr;
136 goto fail;
137 }
138
139 if ((src->blockNum != 0) && (srcDesc->fLink == (u_int32_t) src->blockNum)) {
140 hfs_corruption_debug("hfs_swap_BTNode: invalid forward link (0x%08x == 0x%08x)\n", srcDesc->fLink, (u_int32_t) src->blockNum);
141 error = fsBTInvalidHeaderErr;
142 goto fail;
143 }
144 if ((src->blockNum != 0) && (srcDesc->bLink == (u_int32_t) src->blockNum)) {
145 hfs_corruption_debug("hfs_swap_BTNode: invalid backward link (0x%08x == 0x%08x)\n", srcDesc->bLink, (u_int32_t) src->blockNum);
146 error = fsBTInvalidHeaderErr;
147 goto fail;
148 }
149
150
151 }
152
153 /*
154 * Check srcDesc->kind. Don't swap it because it's only one byte.
155 */
156 if (srcDesc->kind < kBTLeafNode || srcDesc->kind > kBTMapNode) {
157 printf("hfs_swap_BTNode: invalid node kind (%d)\n", srcDesc->kind);
158 error = fsBTInvalidHeaderErr;
159 goto fail;
160 }
161
162 /*
163 * Check srcDesc->height. Don't swap it because it's only one byte.
164 */
165 if (srcDesc->height > kMaxTreeDepth) {
166 printf("hfs_swap_BTNode: invalid node height (%d)\n", srcDesc->height);
167 error = fsBTInvalidHeaderErr;
168 goto fail;
169 }
170
171 /* Don't swap srcDesc->reserved */
172
173 srcDesc->numRecords = SWAP_BE16 (srcDesc->numRecords);
174
175 /*
176 * Swap the node offsets (including the free space one!).
177 */
178 srcOffs = (u_int16_t *)((char *)src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (u_int16_t))));
179
180 /*
181 * Sanity check that the record offsets are within the node itself.
182 */
183 if ((char *)srcOffs > ((char *)src->buffer + src->blockSize) ||
184 (char *)srcOffs < ((char *)src->buffer + sizeof(BTNodeDescriptor))) {
185 printf("hfs_swap_BTNode: invalid record count (0x%04X)\n", srcDesc->numRecords);
186 error = fsBTInvalidHeaderErr;
187 goto fail;
188 }
189
190 /*
191 * Swap and sanity check each of the record offsets.
192 */
193 for (i = 0; i <= srcDesc->numRecords; i++) {
194 srcOffs[i] = SWAP_BE16 (srcOffs[i]);
195
196 /*
197 * Sanity check: must be even, and within the node itself.
198 *
199 * We may be called to swap an unused node, which contains all zeroes.
200 * Unused nodes are expected only when allow_empty_node is true.
201 * If it is false and record offset is zero, return error.
202 */
203 if ((srcOffs[i] & 1) || (
204 (allow_empty_node == false) && (srcOffs[i] == 0)) ||
205 (srcOffs[i] < sizeof(BTNodeDescriptor) && srcOffs[i] != 0) ||
206 (srcOffs[i] > (src->blockSize - 2 * (srcDesc->numRecords + 1)))) {
207 printf("hfs_swap_BTNode: offset #%d invalid (0x%04X) (blockSize 0x%x numRecords %d)\n",
208 i, srcOffs[i], src->blockSize, srcDesc->numRecords);
209 error = fsBTInvalidHeaderErr;
210 goto fail;
211 }
212
213 /*
214 * Make sure the offsets are strictly increasing. Note that we're looping over
215 * them backwards, hence the order in the comparison.
216 */
217 if ((i != 0) && (srcOffs[i] >= srcOffs[i-1])) {
218 printf("hfs_swap_BTNode: offsets %d and %d out of order (0x%04X, 0x%04X)\n",
219 i, i-1, srcOffs[i], srcOffs[i-1]);
220 error = fsBTInvalidHeaderErr;
221 goto fail;
222 }
223 }
224 }
225
226 /*
227 * Swap the records (ordered by frequency of access)
228 */
229 if ((srcDesc->kind == kBTIndexNode) ||
230 (srcDesc-> kind == kBTLeafNode)) {
231
232 if (VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) {
233 error = hfs_swap_HFSPlusBTInternalNode (src, VTOC(vp)->c_fileid, direction);
234 }
235 #if CONFIG_HFS_STD
236 else {
237 error = hfs_swap_HFSBTInternalNode (src, VTOC(vp)->c_fileid, direction);
238 }
239 #endif
240
241 if (error) goto fail;
242
243 } else if (srcDesc-> kind == kBTMapNode) {
244 /* Don't swap the bitmaps, they'll be done in the bitmap routines */
245
246 } else if (srcDesc-> kind == kBTHeaderNode) {
247 /* The header's offset is hard-wired because we cannot trust the offset pointers. */
248 BTHeaderRec *srcHead = (BTHeaderRec *)((char *)src->buffer + sizeof(BTNodeDescriptor));
249
250 srcHead->treeDepth = SWAP_BE16 (srcHead->treeDepth);
251
252 srcHead->rootNode = SWAP_BE32 (srcHead->rootNode);
253 srcHead->leafRecords = SWAP_BE32 (srcHead->leafRecords);
254 srcHead->firstLeafNode = SWAP_BE32 (srcHead->firstLeafNode);
255 srcHead->lastLeafNode = SWAP_BE32 (srcHead->lastLeafNode);
256
257 srcHead->nodeSize = SWAP_BE16 (srcHead->nodeSize);
258 srcHead->maxKeyLength = SWAP_BE16 (srcHead->maxKeyLength);
259
260 srcHead->totalNodes = SWAP_BE32 (srcHead->totalNodes);
261 srcHead->freeNodes = SWAP_BE32 (srcHead->freeNodes);
262
263 srcHead->clumpSize = SWAP_BE32 (srcHead->clumpSize);
264 srcHead->attributes = SWAP_BE32 (srcHead->attributes);
265
266 /* Don't swap srcHead->reserved1 */
267 /* Don't swap srcHead->btreeType; it's only one byte */
268 /* Don't swap srcHead->reserved2 */
269 /* Don't swap srcHead->reserved3 */
270 /* Don't swap bitmap */
271 }
272
273 /*
274 * If we are doing a swap from in-memory to on-disk, then swap the node
275 * descriptor and record offsets after we're done using them.
276 */
277 if (direction == kSwapBTNodeHostToBig) {
278 /*
279 * Sanity check and swap the forward and backward links.
280 * Ignore the header node since its forward and backwards links can legitimately
281 * point to itself.
282 */
283 if (srcDesc->fLink >= btcb->totalNodes) {
284 panic("hfs_UNswap_BTNode: invalid forward link (0x%08X)\n", srcDesc->fLink);
285 error = fsBTInvalidHeaderErr;
286 goto fail;
287 }
288 if ((src->blockNum != 0) && (srcDesc->fLink == (u_int32_t) src->blockNum)) {
289 panic ("hfs_UNswap_BTNode: invalid forward link (0x%08x == 0x%08x)\n",
290 srcDesc->fLink, (u_int32_t) src->blockNum);
291 error = fsBTInvalidHeaderErr;
292 goto fail;
293 }
294
295 if (srcDesc->bLink >= btcb->totalNodes) {
296 panic("hfs_UNswap_BTNode: invalid backward link (0x%08X)\n", srcDesc->bLink);
297 error = fsBTInvalidHeaderErr;
298 goto fail;
299 }
300 if ((src->blockNum != 0) && (srcDesc->bLink == (u_int32_t) src->blockNum)) {
301 panic ("hfs_UNswap_BTNode: invalid backward link (0x%08x == 0x%08x)\n",
302 srcDesc->bLink, (u_int32_t) src->blockNum);
303 error = fsBTInvalidHeaderErr;
304 goto fail;
305 }
306
307
308 srcDesc->fLink = SWAP_BE32 (srcDesc->fLink);
309 srcDesc->bLink = SWAP_BE32 (srcDesc->bLink);
310
311 /*
312 * Check srcDesc->kind. Don't swap it because it's only one byte.
313 */
314 if (srcDesc->kind < kBTLeafNode || srcDesc->kind > kBTMapNode) {
315 panic("hfs_UNswap_BTNode: invalid node kind (%d)\n", srcDesc->kind);
316 error = fsBTInvalidHeaderErr;
317 goto fail;
318 }
319
320 /*
321 * Check srcDesc->height. Don't swap it because it's only one byte.
322 */
323 if (srcDesc->height > kMaxTreeDepth) {
324 panic("hfs_UNswap_BTNode: invalid node height (%d)\n", srcDesc->height);
325 error = fsBTInvalidHeaderErr;
326 goto fail;
327 }
328
329 /* Don't swap srcDesc->reserved */
330
331 /*
332 * Swap the node offsets (including the free space one!).
333 */
334 srcOffs = (u_int16_t *)((char *)src->buffer + (src->blockSize - ((srcDesc->numRecords + 1) * sizeof (u_int16_t))));
335
336 /*
337 * Sanity check that the record offsets are within the node itself.
338 */
339 if ((char *)srcOffs > ((char *)src->buffer + src->blockSize) ||
340 (char *)srcOffs < ((char *)src->buffer + sizeof(BTNodeDescriptor))) {
341 panic("hfs_UNswap_BTNode: invalid record count (0x%04X)\n", srcDesc->numRecords);
342 error = fsBTInvalidHeaderErr;
343 goto fail;
344 }
345
346 /*
347 * Swap and sanity check each of the record offsets.
348 */
349 for (i = 0; i <= srcDesc->numRecords; i++) {
350 /*
351 * Sanity check: must be even, and within the node itself.
352 *
353 * We may be called to swap an unused node, which contains all zeroes.
354 * This can happen when the last record from a node gets deleted.
355 * This is why we allow the record offset to be zero.
356 * Unused nodes are expected only when allow_empty_node is true
357 * (the caller should set it to true for kSwapBTNodeBigToHost).
358 */
359 if ((srcOffs[i] & 1) ||
360 ((allow_empty_node == false) && (srcOffs[i] == 0)) ||
361 (srcOffs[i] < sizeof(BTNodeDescriptor) && srcOffs[i] != 0) ||
362 (srcOffs[i] > (src->blockSize - 2 * (srcDesc->numRecords + 1)))) {
363 panic("hfs_UNswap_BTNode: offset #%d invalid (0x%04X) (blockSize 0x%x numRecords %d)\n",
364 i, srcOffs[i], src->blockSize, srcDesc->numRecords);
365 error = fsBTInvalidHeaderErr;
366 goto fail;
367 }
368
369 /*
370 * Make sure the offsets are strictly increasing. Note that we're looping over
371 * them backwards, hence the order in the comparison.
372 */
373 if ((i < srcDesc->numRecords) && (srcOffs[i+1] >= srcOffs[i])) {
374 panic("hfs_UNswap_BTNode: offsets %d and %d out of order (0x%04X, 0x%04X)\n",
375 i+1, i, srcOffs[i+1], srcOffs[i]);
376 error = fsBTInvalidHeaderErr;
377 goto fail;
378 }
379
380 srcOffs[i] = SWAP_BE16 (srcOffs[i]);
381 }
382
383 srcDesc->numRecords = SWAP_BE16 (srcDesc->numRecords);
384 }
385
386 fail:
387 if (error) {
388 /*
389 * Log some useful information about where the corrupt node is.
390 */
391 printf("hfs: node=%lld fileID=%u volume=%s device=%s\n", src->blockNum, VTOC(vp)->c_fileid,
392 VTOVCB(vp)->vcbVN, vfs_statfs(vnode_mount(vp))->f_mntfromname);
393 hfs_mark_inconsistent(VTOVCB(vp), HFS_INCONSISTENCY_DETECTED);
394 }
395
396 return (error);
397 }
398
399 int
400 hfs_swap_HFSPlusBTInternalNode (
401 BlockDescriptor *src,
402 HFSCatalogNodeID fileID,
403 enum HFSBTSwapDirection direction
404 )
405 {
406 BTNodeDescriptor *srcDesc = src->buffer;
407 u_int16_t *srcOffs = (u_int16_t *)((char *)src->buffer + (src->blockSize - (srcDesc->numRecords * sizeof (u_int16_t))));
408 char *nextRecord; /* Points to start of record following current one */
409
410 /*
411 * i is an int32 because it needs to be negative to index the offset to free space.
412 * srcDesc->numRecords is a u_int16_t and is unlikely to become 32-bit so this should be ok.
413 */
414
415 int32_t i;
416 u_int32_t j;
417
418 if (fileID == kHFSExtentsFileID) {
419 HFSPlusExtentKey *srcKey;
420 HFSPlusExtentDescriptor *srcRec;
421 size_t recordSize; /* Size of the data part of the record, or node number for index nodes */
422
423 if (srcDesc->kind == kBTIndexNode)
424 recordSize = sizeof(u_int32_t);
425 else
426 recordSize = sizeof(HFSPlusExtentDescriptor);
427
428 for (i = 0; i < srcDesc->numRecords; i++) {
429 /* Point to the start of the record we're currently checking. */
430 srcKey = (HFSPlusExtentKey *)((char *)src->buffer + srcOffs[i]);
431
432 /*
433 * Point to start of next (larger offset) record. We'll use this
434 * to be sure the current record doesn't overflow into the next
435 * record.
436 */
437 nextRecord = (char *)src->buffer + srcOffs[i-1];
438
439 /*
440 * Make sure the key and data are within the buffer. Since both key
441 * and data are fixed size, this is relatively easy. Note that this
442 * relies on the keyLength being a constant; we verify the keyLength
443 * below.
444 */
445 if ((char *)srcKey + sizeof(HFSPlusExtentKey) + recordSize > nextRecord) {
446 if (direction == kSwapBTNodeHostToBig) {
447 panic("hfs_swap_HFSPlusBTInternalNode: extents key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
448 } else {
449 printf("hfs_swap_HFSPlusBTInternalNode: extents key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
450 }
451 return fsBTInvalidNodeErr;
452 }
453
454 if (direction == kSwapBTNodeBigToHost)
455 srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
456 if (srcKey->keyLength != sizeof(*srcKey) - sizeof(srcKey->keyLength)) {
457 if (direction == kSwapBTNodeHostToBig) {
458 panic("hfs_swap_HFSPlusBTInternalNode: extents key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
459 } else {
460 printf("hfs_swap_HFSPlusBTInternalNode: extents key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
461 }
462 return fsBTInvalidNodeErr;
463 }
464 srcRec = (HFSPlusExtentDescriptor *)((char *)srcKey + srcKey->keyLength + sizeof(srcKey->keyLength));
465 if (direction == kSwapBTNodeHostToBig)
466 srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
467
468 /* Don't swap srcKey->forkType; it's only one byte */
469 /* Don't swap srcKey->pad */
470
471 srcKey->fileID = SWAP_BE32 (srcKey->fileID);
472 srcKey->startBlock = SWAP_BE32 (srcKey->startBlock);
473
474 if (srcDesc->kind == kBTIndexNode) {
475 /* For index nodes, the record data is just a child node number. */
476 *((u_int32_t *)srcRec) = SWAP_BE32 (*((u_int32_t *)srcRec));
477 } else {
478 /* Swap the extent data */
479 for (j = 0; j < kHFSPlusExtentDensity; j++) {
480 srcRec[j].startBlock = SWAP_BE32 (srcRec[j].startBlock);
481 srcRec[j].blockCount = SWAP_BE32 (srcRec[j].blockCount);
482 }
483 }
484 }
485
486 } else if (fileID == kHFSCatalogFileID) {
487 HFSPlusCatalogKey *srcKey;
488 int16_t *srcPtr;
489 u_int16_t keyLength;
490
491 for (i = 0; i < srcDesc->numRecords; i++) {
492 /* Point to the start of the record we're currently checking. */
493 srcKey = (HFSPlusCatalogKey *)((char *)src->buffer + srcOffs[i]);
494
495 /*
496 * Point to start of next (larger offset) record. We'll use this
497 * to be sure the current record doesn't overflow into the next
498 * record.
499 */
500 nextRecord = (char *)src->buffer + (uintptr_t)(srcOffs[i-1]);
501
502 /*
503 * Make sure we can safely dereference the keyLength and parentID fields.
504 */
505 if ((char *)srcKey + offsetof(HFSPlusCatalogKey, nodeName.unicode[0]) > nextRecord) {
506 if (direction == kSwapBTNodeHostToBig) {
507 panic("hfs_swap_HFSPlusBTInternalNode: catalog key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
508 } else {
509 printf("hfs_swap_HFSPlusBTInternalNode: catalog key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
510 }
511 return fsBTInvalidNodeErr;
512 }
513
514 /*
515 * Swap and sanity check the key length
516 */
517 if (direction == kSwapBTNodeBigToHost)
518 srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
519 keyLength = srcKey->keyLength; /* Put it in a local (native order) because we use it several times */
520 if (direction == kSwapBTNodeHostToBig)
521 srcKey->keyLength = SWAP_BE16 (keyLength);
522
523 /* Sanity check the key length */
524 if (keyLength < kHFSPlusCatalogKeyMinimumLength || keyLength > kHFSPlusCatalogKeyMaximumLength) {
525 if (direction == kSwapBTNodeHostToBig) {
526 panic("hfs_swap_HFSPlusBTInternalNode: catalog key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, keyLength);
527 } else {
528 printf("hfs_swap_HFSPlusBTInternalNode: catalog key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, keyLength);
529 }
530 return fsBTInvalidNodeErr;
531 }
532
533 /*
534 * Make sure that we can safely dereference the record's type field or
535 * an index node's child node number.
536 */
537 srcPtr = (int16_t *)((char *)srcKey + keyLength + sizeof(srcKey->keyLength));
538 if ((char *)srcPtr + sizeof(u_int32_t) > nextRecord) {
539 if (direction == kSwapBTNodeHostToBig) {
540 panic("hfs_swap_HFSPlusBTInternalNode: catalog key #%d too big\n", srcDesc->numRecords-i-1);
541 } else {
542 printf("hfs_swap_HFSPlusBTInternalNode: catalog key #%d too big\n", srcDesc->numRecords-i-1);
543 }
544 return fsBTInvalidNodeErr;
545 }
546
547 srcKey->parentID = SWAP_BE32 (srcKey->parentID);
548
549 /*
550 * Swap and sanity check the key's node name
551 */
552 if (direction == kSwapBTNodeBigToHost)
553 srcKey->nodeName.length = SWAP_BE16 (srcKey->nodeName.length);
554 /* Make sure name length is consistent with key length */
555 if (keyLength < sizeof(srcKey->parentID) + sizeof(srcKey->nodeName.length) +
556 srcKey->nodeName.length*sizeof(srcKey->nodeName.unicode[0])) {
557 if (direction == kSwapBTNodeHostToBig) {
558 panic("hfs_swap_HFSPlusBTInternalNode: catalog record #%d keyLength=%d expected=%lu\n",
559 srcDesc->numRecords-i, keyLength, sizeof(srcKey->parentID) + sizeof(srcKey->nodeName.length) +
560 srcKey->nodeName.length*sizeof(srcKey->nodeName.unicode[0]));
561 } else {
562 printf("hfs_swap_HFSPlusBTInternalNode: catalog record #%d keyLength=%d expected=%lu\n",
563 srcDesc->numRecords-i, keyLength, sizeof(srcKey->parentID) + sizeof(srcKey->nodeName.length) +
564 srcKey->nodeName.length*sizeof(srcKey->nodeName.unicode[0]));
565 }
566 return fsBTInvalidNodeErr;
567 }
568 for (j = 0; j < srcKey->nodeName.length; j++) {
569 srcKey->nodeName.unicode[j] = SWAP_BE16 (srcKey->nodeName.unicode[j]);
570 }
571 if (direction == kSwapBTNodeHostToBig)
572 srcKey->nodeName.length = SWAP_BE16 (srcKey->nodeName.length);
573
574 /*
575 * For index nodes, the record data is just the child's node number.
576 * Skip over swapping the various types of catalog record.
577 */
578 if (srcDesc->kind == kBTIndexNode) {
579 *((u_int32_t *)srcPtr) = SWAP_BE32 (*((u_int32_t *)srcPtr));
580 continue;
581 }
582
583 /* Make sure the recordType is in native order before using it. */
584 if (direction == kSwapBTNodeBigToHost)
585 srcPtr[0] = SWAP_BE16 (srcPtr[0]);
586
587 if (srcPtr[0] == kHFSPlusFolderRecord) {
588 HFSPlusCatalogFolder *srcRec = (HFSPlusCatalogFolder *)srcPtr;
589 if ((char *)srcRec + sizeof(*srcRec) > nextRecord) {
590 if (direction == kSwapBTNodeHostToBig) {
591 panic("hfs_swap_HFSPlusBTInternalNode: catalog folder record #%d too big\n", srcDesc->numRecords-i-1);
592 } else {
593 printf("hfs_swap_HFSPlusBTInternalNode: catalog folder record #%d too big\n", srcDesc->numRecords-i-1);
594 }
595 return fsBTInvalidNodeErr;
596 }
597
598 srcRec->flags = SWAP_BE16 (srcRec->flags);
599 srcRec->valence = SWAP_BE32 (srcRec->valence);
600 srcRec->folderID = SWAP_BE32 (srcRec->folderID);
601 srcRec->createDate = SWAP_BE32 (srcRec->createDate);
602 srcRec->contentModDate = SWAP_BE32 (srcRec->contentModDate);
603 srcRec->attributeModDate = SWAP_BE32 (srcRec->attributeModDate);
604 srcRec->accessDate = SWAP_BE32 (srcRec->accessDate);
605 srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
606
607 srcRec->bsdInfo.ownerID = SWAP_BE32 (srcRec->bsdInfo.ownerID);
608 srcRec->bsdInfo.groupID = SWAP_BE32 (srcRec->bsdInfo.groupID);
609
610 /* Don't swap srcRec->bsdInfo.adminFlags; it's only one byte */
611 /* Don't swap srcRec->bsdInfo.ownerFlags; it's only one byte */
612
613 srcRec->bsdInfo.fileMode = SWAP_BE16 (srcRec->bsdInfo.fileMode);
614 srcRec->bsdInfo.special.iNodeNum = SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
615
616 srcRec->textEncoding = SWAP_BE32 (srcRec->textEncoding);
617
618 /* Don't swap srcRec->userInfo */
619 /* Don't swap srcRec->finderInfo */
620 srcRec->folderCount = SWAP_BE32 (srcRec->folderCount);
621
622 } else if (srcPtr[0] == kHFSPlusFileRecord) {
623 HFSPlusCatalogFile *srcRec = (HFSPlusCatalogFile *)srcPtr;
624 if ((char *)srcRec + sizeof(*srcRec) > nextRecord) {
625 if (direction == kSwapBTNodeHostToBig) {
626 panic("hfs_swap_HFSPlusBTInternalNode: catalog file record #%d too big\n", srcDesc->numRecords-i-1);
627 } else {
628 printf("hfs_swap_HFSPlusBTInternalNode: catalog file record #%d too big\n", srcDesc->numRecords-i-1);
629 }
630 return fsBTInvalidNodeErr;
631 }
632
633 srcRec->flags = SWAP_BE16 (srcRec->flags);
634
635 srcRec->fileID = SWAP_BE32 (srcRec->fileID);
636
637 srcRec->createDate = SWAP_BE32 (srcRec->createDate);
638 srcRec->contentModDate = SWAP_BE32 (srcRec->contentModDate);
639 srcRec->attributeModDate = SWAP_BE32 (srcRec->attributeModDate);
640 srcRec->accessDate = SWAP_BE32 (srcRec->accessDate);
641 srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
642
643 srcRec->bsdInfo.ownerID = SWAP_BE32 (srcRec->bsdInfo.ownerID);
644 srcRec->bsdInfo.groupID = SWAP_BE32 (srcRec->bsdInfo.groupID);
645
646 /* Don't swap srcRec->bsdInfo.adminFlags; it's only one byte */
647 /* Don't swap srcRec->bsdInfo.ownerFlags; it's only one byte */
648
649 srcRec->bsdInfo.fileMode = SWAP_BE16 (srcRec->bsdInfo.fileMode);
650 srcRec->bsdInfo.special.iNodeNum = SWAP_BE32 (srcRec->bsdInfo.special.iNodeNum);
651
652 srcRec->textEncoding = SWAP_BE32 (srcRec->textEncoding);
653
654 /* If kHFSHasLinkChainBit is set, reserved1 is hl_FirstLinkID.
655 * In all other context, it is expected to be zero.
656 */
657 srcRec->reserved1 = SWAP_BE32 (srcRec->reserved1);
658
659 /* Don't swap srcRec->userInfo */
660 /* Don't swap srcRec->finderInfo */
661 /* Don't swap srcRec->reserved2 */
662
663 hfs_swap_HFSPlusForkData (&srcRec->dataFork);
664 hfs_swap_HFSPlusForkData (&srcRec->resourceFork);
665
666 } else if ((srcPtr[0] == kHFSPlusFolderThreadRecord) ||
667 (srcPtr[0] == kHFSPlusFileThreadRecord)) {
668
669 /*
670 * Make sure there is room for parentID and name length.
671 */
672 HFSPlusCatalogThread *srcRec = (HFSPlusCatalogThread *)srcPtr;
673 if ((char *) &srcRec->nodeName.unicode[0] > nextRecord) {
674 if (direction == kSwapBTNodeHostToBig) {
675 panic("hfs_swap_HFSPlusBTInternalNode: catalog thread record #%d too big\n", srcDesc->numRecords-i-1);
676 } else {
677 printf("hfs_swap_HFSPlusBTInternalNode: catalog thread record #%d too big\n", srcDesc->numRecords-i-1);
678 }
679 return fsBTInvalidNodeErr;
680 }
681
682 /* Don't swap srcRec->reserved */
683
684 srcRec->parentID = SWAP_BE32 (srcRec->parentID);
685
686 if (direction == kSwapBTNodeBigToHost)
687 srcRec->nodeName.length = SWAP_BE16 (srcRec->nodeName.length);
688
689 /*
690 * Make sure there is room for the name in the buffer.
691 * Then swap the characters of the name itself.
692 */
693 if ((char *) &srcRec->nodeName.unicode[srcRec->nodeName.length] > nextRecord) {
694 if (direction == kSwapBTNodeHostToBig) {
695 panic("hfs_swap_HFSPlusBTInternalNode: catalog thread record #%d name too big\n", srcDesc->numRecords-i-1);
696 } else {
697 printf("hfs_swap_HFSPlusBTInternalNode: catalog thread record #%d name too big\n", srcDesc->numRecords-i-1);
698 }
699 return fsBTInvalidNodeErr;
700 }
701 for (j = 0; j < srcRec->nodeName.length; j++) {
702 srcRec->nodeName.unicode[j] = SWAP_BE16 (srcRec->nodeName.unicode[j]);
703 }
704
705 if (direction == kSwapBTNodeHostToBig)
706 srcRec->nodeName.length = SWAP_BE16 (srcRec->nodeName.length);
707
708 } else {
709 if (direction == kSwapBTNodeHostToBig) {
710 panic("hfs_swap_HFSPlusBTInternalNode: unrecognized catalog record type (0x%04X; record #%d)\n", srcPtr[0], srcDesc->numRecords-i-1);
711 } else {
712 printf("hfs_swap_HFSPlusBTInternalNode: unrecognized catalog record type (0x%04X; record #%d)\n", srcPtr[0], srcDesc->numRecords-i-1);
713 }
714 return fsBTInvalidNodeErr;
715 }
716
717 /* We can swap the record type now that we're done using it. */
718 if (direction == kSwapBTNodeHostToBig)
719 srcPtr[0] = SWAP_BE16 (srcPtr[0]);
720 }
721
722 } else if (fileID == kHFSAttributesFileID) {
723 HFSPlusAttrKey *srcKey;
724 HFSPlusAttrRecord *srcRec;
725 u_int16_t keyLength;
726 u_int32_t attrSize = 0;
727
728 for (i = 0; i < srcDesc->numRecords; i++) {
729 /* Point to the start of the record we're currently checking. */
730 srcKey = (HFSPlusAttrKey *)((char *)src->buffer + srcOffs[i]);
731
732 /*
733 * Point to start of next (larger offset) record. We'll use this
734 * to be sure the current record doesn't overflow into the next
735 * record.
736 */
737 nextRecord = (char *)src->buffer + srcOffs[i-1];
738
739 /* Make sure there is room in the buffer for a minimal key */
740 if ((char *) &srcKey->attrName[1] > nextRecord) {
741 if (direction == kSwapBTNodeHostToBig) {
742 panic("hfs_swap_HFSPlusBTInternalNode: attr key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
743 } else {
744 printf("hfs_swap_HFSPlusBTInternalNode: attr key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
745 }
746 return fsBTInvalidNodeErr;
747 }
748
749 /* Swap the key length field */
750 if (direction == kSwapBTNodeBigToHost)
751 srcKey->keyLength = SWAP_BE16(srcKey->keyLength);
752 keyLength = srcKey->keyLength; /* Keep a copy in native order */
753 if (direction == kSwapBTNodeHostToBig)
754 srcKey->keyLength = SWAP_BE16(srcKey->keyLength);
755
756 /*
757 * Make sure that we can safely dereference the record's type field or
758 * an index node's child node number.
759 */
760 srcRec = (HFSPlusAttrRecord *)((char *)srcKey + keyLength + sizeof(srcKey->keyLength));
761 if ((char *)srcRec + sizeof(u_int32_t) > nextRecord) {
762 if (direction == kSwapBTNodeHostToBig) {
763 panic("hfs_swap_HFSPlusBTInternalNode: attr key #%d too big (%d)\n", srcDesc->numRecords-i-1, keyLength);
764 } else {
765 printf("hfs_swap_HFSPlusBTInternalNode: attr key #%d too big (%d)\n", srcDesc->numRecords-i-1, keyLength);
766 }
767 return fsBTInvalidNodeErr;
768 }
769
770 srcKey->fileID = SWAP_BE32(srcKey->fileID);
771 srcKey->startBlock = SWAP_BE32(srcKey->startBlock);
772
773 /*
774 * Swap and check the attribute name
775 */
776 if (direction == kSwapBTNodeBigToHost)
777 srcKey->attrNameLen = SWAP_BE16(srcKey->attrNameLen);
778 /* Sanity check the attribute name length */
779 if (srcKey->attrNameLen > kHFSMaxAttrNameLen || keyLength < (kHFSPlusAttrKeyMinimumLength + sizeof(u_int16_t)*srcKey->attrNameLen)) {
780 if (direction == kSwapBTNodeHostToBig) {
781 panic("hfs_swap_HFSPlusBTInternalNode: attr key #%d keyLength=%d attrNameLen=%d\n", srcDesc->numRecords-i-1, keyLength, srcKey->attrNameLen);
782 } else {
783 printf("hfs_swap_HFSPlusBTInternalNode: attr key #%d keyLength=%d attrNameLen=%d\n", srcDesc->numRecords-i-1, keyLength, srcKey->attrNameLen);
784 }
785 return fsBTInvalidNodeErr;
786 }
787 for (j = 0; j < srcKey->attrNameLen; j++)
788 srcKey->attrName[j] = SWAP_BE16(srcKey->attrName[j]);
789 if (direction == kSwapBTNodeHostToBig)
790 srcKey->attrNameLen = SWAP_BE16(srcKey->attrNameLen);
791
792 /*
793 * For index nodes, the record data is just the child's node number.
794 * Skip over swapping the various types of attribute record.
795 */
796 if (srcDesc->kind == kBTIndexNode) {
797 *((u_int32_t *)srcRec) = SWAP_BE32 (*((u_int32_t *)srcRec));
798 continue;
799 }
800
801 /* Swap the record data */
802 if (direction == kSwapBTNodeBigToHost)
803 srcRec->recordType = SWAP_BE32(srcRec->recordType);
804 switch (srcRec->recordType) {
805 case kHFSPlusAttrInlineData:
806 /* Is there room for the inline data header? */
807 if ((char *) &srcRec->attrData.attrData[0] > nextRecord) {
808 if (direction == kSwapBTNodeHostToBig) {
809 panic("hfs_swap_HFSPlusBTInternalNode: attr inline #%d too big\n", srcDesc->numRecords-i-1);
810 } else {
811 printf("hfs_swap_HFSPlusBTInternalNode: attr inline #%d too big\n", srcDesc->numRecords-i-1);
812 }
813 return fsBTInvalidNodeErr;
814 }
815
816 /* We're not swapping the reserved fields */
817
818 /* Swap the attribute size */
819 if (direction == kSwapBTNodeHostToBig)
820 attrSize = srcRec->attrData.attrSize;
821 srcRec->attrData.attrSize = SWAP_BE32(srcRec->attrData.attrSize);
822 if (direction == kSwapBTNodeBigToHost)
823 attrSize = srcRec->attrData.attrSize;
824
825 /* Is there room for the inline attribute data? */
826 if ((char *) &srcRec->attrData.attrData[attrSize] > nextRecord) {
827 if (direction == kSwapBTNodeHostToBig) {
828 panic("hfs_swap_HFSPlusBTInternalNode: attr inline #%d too big (attrSize=%u)\n", srcDesc->numRecords-i-1, attrSize);
829 } else {
830 printf("hfs_swap_HFSPlusBTInternalNode: attr inline #%d too big (attrSize=%u)\n", srcDesc->numRecords-i-1, attrSize);
831 }
832 return fsBTInvalidNodeErr;
833 }
834
835 /* Not swapping the attribute data itself */
836 break;
837
838 case kHFSPlusAttrForkData:
839 /* Is there room for the fork data record? */
840 if ((char *)srcRec + sizeof(HFSPlusAttrForkData) > nextRecord) {
841 if (direction == kSwapBTNodeHostToBig) {
842 panic("hfs_swap_HFSPlusBTInternalNode: attr fork data #%d too big\n", srcDesc->numRecords-i-1);
843 } else {
844 printf("hfs_swap_HFSPlusBTInternalNode: attr fork data #%d too big\n", srcDesc->numRecords-i-1);
845 }
846 return fsBTInvalidNodeErr;
847 }
848
849 /* We're not swapping the reserved field */
850
851 hfs_swap_HFSPlusForkData(&srcRec->forkData.theFork);
852 break;
853
854 case kHFSPlusAttrExtents:
855 /* Is there room for an extent record? */
856 if ((char *)srcRec + sizeof(HFSPlusAttrExtents) > nextRecord) {
857 if (direction == kSwapBTNodeHostToBig) {
858 panic("hfs_swap_HFSPlusBTInternalNode: attr extents #%d too big\n", srcDesc->numRecords-i-1);
859 } else {
860 printf("hfs_swap_HFSPlusBTInternalNode: attr extents #%d too big\n", srcDesc->numRecords-i-1);
861 }
862 return fsBTInvalidNodeErr;
863 }
864
865 /* We're not swapping the reserved field */
866
867 for (j = 0; j < kHFSPlusExtentDensity; j++) {
868 srcRec->overflowExtents.extents[j].startBlock =
869 SWAP_BE32(srcRec->overflowExtents.extents[j].startBlock);
870 srcRec->overflowExtents.extents[j].blockCount =
871 SWAP_BE32(srcRec->overflowExtents.extents[j].blockCount);
872 }
873 break;
874 }
875 if (direction == kSwapBTNodeHostToBig)
876 srcRec->recordType = SWAP_BE32(srcRec->recordType);
877 }
878 } else if (fileID > kHFSFirstUserCatalogNodeID) {
879 /* The only B-tree with a non-system CNID that we use is the hotfile B-tree */
880 HotFileKey *srcKey;
881 u_int32_t *srcRec;
882
883 for (i = 0; i < srcDesc->numRecords; i++) {
884 /* Point to the start of the record we're currently checking. */
885 srcKey = (HotFileKey *)((char *)src->buffer + srcOffs[i]);
886
887 /*
888 * Point to start of next (larger offset) record. We'll use this
889 * to be sure the current record doesn't overflow into the next
890 * record.
891 */
892 nextRecord = (char *)src->buffer + srcOffs[i-1];
893
894 /* Make sure there is room for the key (HotFileKey) and data (u_int32_t) */
895 if ((char *)srcKey + sizeof(HotFileKey) + sizeof(u_int32_t) > nextRecord) {
896 if (direction == kSwapBTNodeHostToBig) {
897 panic("hfs_swap_HFSPlusBTInternalNode: hotfile #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
898 } else {
899 printf("hfs_swap_HFSPlusBTInternalNode: hotfile #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
900 }
901 return fsBTInvalidNodeErr;
902 }
903
904 /* Swap and sanity check the key length field */
905 if (direction == kSwapBTNodeBigToHost)
906 srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
907 if (srcKey->keyLength != sizeof(*srcKey) - sizeof(srcKey->keyLength)) {
908 if (direction == kSwapBTNodeHostToBig) {
909 panic("hfs_swap_HFSPlusBTInternalNode: hotfile #%d incorrect keyLength %d\n", srcDesc->numRecords-i-1, srcKey->keyLength);
910 } else {
911 printf("hfs_swap_HFSPlusBTInternalNode: hotfile #%d incorrect keyLength %d\n", srcDesc->numRecords-i-1, srcKey->keyLength);
912 }
913 return fsBTInvalidNodeErr;
914 }
915 srcRec = (u_int32_t *)((char *)srcKey + srcKey->keyLength + sizeof(srcKey->keyLength));
916 if (direction == kSwapBTNodeHostToBig)
917 srcKey->keyLength = SWAP_BE16 (srcKey->keyLength);
918
919 /* Don't swap srcKey->forkType */
920 /* Don't swap srcKey->pad */
921
922 srcKey->temperature = SWAP_BE32 (srcKey->temperature);
923 srcKey->fileID = SWAP_BE32 (srcKey->fileID);
924
925 *((u_int32_t *)srcRec) = SWAP_BE32 (*((u_int32_t *)srcRec));
926 }
927 } else {
928 panic ("hfs_swap_HFSPlusBTInternalNode: fileID %u is not a system B-tree\n", fileID);
929 }
930
931
932 return (0);
933 }
934
935 #if CONFIG_HFS_STD
936 int
937 hfs_swap_HFSBTInternalNode (
938 BlockDescriptor *src,
939 HFSCatalogNodeID fileID,
940 enum HFSBTSwapDirection direction
941 )
942 {
943 BTNodeDescriptor *srcDesc = src->buffer;
944 u_int16_t *srcOffs = (u_int16_t *)((char *)src->buffer + (src->blockSize - (srcDesc->numRecords * sizeof (u_int16_t))));
945 char *nextRecord; /* Points to start of record following current one */
946
947 /*
948 * i is an int32 because it needs to be negative to index the offset to free space.
949 * srcDesc->numRecords is a u_int16_t and is unlikely to become 32-bit so this should be ok.
950 */
951 int32_t i;
952 u_int32_t j;
953
954 if (fileID == kHFSExtentsFileID) {
955 HFSExtentKey *srcKey;
956 HFSExtentDescriptor *srcRec;
957 size_t recordSize; /* Size of the data part of the record, or node number for index nodes */
958
959 if (srcDesc->kind == kBTIndexNode)
960 recordSize = sizeof(u_int32_t);
961 else
962 recordSize = sizeof(HFSExtentDescriptor);
963
964 for (i = 0; i < srcDesc->numRecords; i++) {
965 /* Point to the start of the record we're currently checking. */
966 srcKey = (HFSExtentKey *)((char *)src->buffer + srcOffs[i]);
967
968 /*
969 * Point to start of next (larger offset) record. We'll use this
970 * to be sure the current record doesn't overflow into the next
971 * record.
972 */
973 nextRecord = (char *)src->buffer + srcOffs[i-1];
974
975 /*
976 * Make sure the key and data are within the buffer. Since both key
977 * and data are fixed size, this is relatively easy. Note that this
978 * relies on the keyLength being a constant; we verify the keyLength
979 * below.
980 */
981 if ((char *)srcKey + sizeof(HFSExtentKey) + recordSize > nextRecord) {
982 if (direction == kSwapBTNodeHostToBig) {
983 panic("hfs_swap_HFSBTInternalNode: extents key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
984 } else {
985 printf("hfs_swap_HFSBTInternalNode: extents key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
986 }
987 return fsBTInvalidNodeErr;
988 }
989
990 /* Don't swap srcKey->keyLength (it's only one byte), but do sanity check it */
991 if (srcKey->keyLength != sizeof(*srcKey) - sizeof(srcKey->keyLength)) {
992 if (direction == kSwapBTNodeHostToBig) {
993 panic("hfs_swap_HFSBTInternalNode: extents key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
994 } else {
995 printf("hfs_swap_HFSBTInternalNode: extents key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
996 }
997 return fsBTInvalidNodeErr;
998 }
999
1000 /* Don't swap srcKey->forkType; it's only one byte */
1001
1002 srcKey->fileID = SWAP_BE32 (srcKey->fileID);
1003 srcKey->startBlock = SWAP_BE16 (srcKey->startBlock);
1004
1005 /* Point to record data (round up to even byte boundary) */
1006 srcRec = (HFSExtentDescriptor *)((char *)srcKey + ((srcKey->keyLength + 2) & ~1));
1007
1008 if (srcDesc->kind == kBTIndexNode) {
1009 /* For index nodes, the record data is just a child node number. */
1010 *((u_int32_t *)srcRec) = SWAP_BE32 (*((u_int32_t *)srcRec));
1011 } else {
1012 /* Swap the extent data */
1013 for (j = 0; j < kHFSExtentDensity; j++) {
1014 srcRec[j].startBlock = SWAP_BE16 (srcRec[j].startBlock);
1015 srcRec[j].blockCount = SWAP_BE16 (srcRec[j].blockCount);
1016 }
1017 }
1018 }
1019
1020 } else if (fileID == kHFSCatalogFileID) {
1021 HFSCatalogKey *srcKey;
1022 int16_t *srcPtr;
1023 unsigned expectedKeyLength;
1024
1025 for (i = 0; i < srcDesc->numRecords; i++) {
1026 /* Point to the start of the record we're currently checking. */
1027 srcKey = (HFSCatalogKey *)((char *)src->buffer + srcOffs[i]);
1028
1029 /*
1030 * Point to start of next (larger offset) record. We'll use this
1031 * to be sure the current record doesn't overflow into the next
1032 * record.
1033 */
1034 nextRecord = (char *)src->buffer + srcOffs[i-1];
1035
1036 /*
1037 * Make sure we can safely dereference the keyLength and parentID fields.
1038 * The value 8 below is 1 bytes for keyLength + 1 byte reserved + 4 bytes
1039 * for parentID + 1 byte for nodeName's length + 1 byte to round up the
1040 * record start to an even offset, which forms a minimal key.
1041 */
1042 if ((char *)srcKey + 8 > nextRecord) {
1043 if (direction == kSwapBTNodeHostToBig) {
1044 panic("hfs_swap_HFSBTInternalNode: catalog key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
1045 } else {
1046 printf("hfs_swap_HFSBTInternalNode: catalog key #%d offset too big (0x%04X)\n", srcDesc->numRecords-i-1, srcOffs[i]);
1047 }
1048 return fsBTInvalidNodeErr;
1049 }
1050
1051 /* Don't swap srcKey->keyLength (it's only one byte), but do sanity check it */
1052 if (srcKey->keyLength < kHFSCatalogKeyMinimumLength || srcKey->keyLength > kHFSCatalogKeyMaximumLength) {
1053 if (direction == kSwapBTNodeHostToBig) {
1054 panic("hfs_swap_HFSBTInternalNode: catalog key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
1055 } else {
1056 printf("hfs_swap_HFSBTInternalNode: catalog key #%d invalid length (%d)\n", srcDesc->numRecords-i-1, srcKey->keyLength);
1057 }
1058 return fsBTInvalidNodeErr;
1059 }
1060
1061 /* Don't swap srcKey->reserved */
1062
1063 srcKey->parentID = SWAP_BE32 (srcKey->parentID);
1064
1065 /* Don't swap srcKey->nodeName */
1066
1067 /* Make sure the keyLength is big enough for the key's content */
1068 if (srcDesc->kind == kBTIndexNode)
1069 expectedKeyLength = sizeof(*srcKey) - sizeof(srcKey->keyLength);
1070 else
1071 expectedKeyLength = srcKey->nodeName[0] + kHFSCatalogKeyMinimumLength;
1072 if (srcKey->keyLength < expectedKeyLength) {
1073 if (direction == kSwapBTNodeHostToBig) {
1074 panic("hfs_swap_HFSBTInternalNode: catalog record #%d keyLength=%u expected=%u\n",
1075 srcDesc->numRecords-i, srcKey->keyLength, expectedKeyLength);
1076 } else {
1077 printf("hfs_swap_HFSBTInternalNode: catalog record #%d keyLength=%u expected=%u\n",
1078 srcDesc->numRecords-i, srcKey->keyLength, expectedKeyLength);
1079 }
1080 return fsBTInvalidNodeErr;
1081 }
1082
1083 /* Point to record data (round up to even byte boundary) */
1084 srcPtr = (int16_t *)((char *)srcKey + ((srcKey->keyLength + 2) & ~1));
1085
1086 /*
1087 * Make sure that we can safely dereference the record's type field or
1088 * and index node's child node number.
1089 */
1090 if ((char *)srcPtr + sizeof(u_int32_t) > nextRecord) {
1091 if (direction == kSwapBTNodeHostToBig) {
1092 panic("hfs_swap_HFSBTInternalNode: catalog key #%d too big\n", srcDesc->numRecords-i-1);
1093 } else {
1094 printf("hfs_swap_HFSBTInternalNode: catalog key #%d too big\n", srcDesc->numRecords-i-1);
1095 }
1096 return fsBTInvalidNodeErr;
1097 }
1098
1099 /*
1100 * For index nodes, the record data is just the child's node number.
1101 * Skip over swapping the various types of catalog record.
1102 */
1103 if (srcDesc->kind == kBTIndexNode) {
1104 *((u_int32_t *)srcPtr) = SWAP_BE32 (*((u_int32_t *)srcPtr));
1105 continue;
1106 }
1107
1108 /* Make sure the recordType is in native order before using it. */
1109 if (direction == kSwapBTNodeBigToHost)
1110 srcPtr[0] = SWAP_BE16 (srcPtr[0]);
1111
1112 if (srcPtr[0] == kHFSFolderRecord) {
1113 HFSCatalogFolder *srcRec = (HFSCatalogFolder *)srcPtr;
1114 if ((char *)srcRec + sizeof(*srcRec) > nextRecord) {
1115 if (direction == kSwapBTNodeHostToBig) {
1116 panic("hfs_swap_HFSBTInternalNode: catalog folder record #%d too big\n", srcDesc->numRecords-i-1);
1117 } else {
1118 printf("hfs_swap_HFSBTInternalNode: catalog folder record #%d too big\n", srcDesc->numRecords-i-1);
1119 }
1120 return fsBTInvalidNodeErr;
1121 }
1122
1123 srcRec->flags = SWAP_BE16 (srcRec->flags);
1124 srcRec->valence = SWAP_BE16 (srcRec->valence);
1125
1126 srcRec->folderID = SWAP_BE32 (srcRec->folderID);
1127 srcRec->createDate = SWAP_BE32 (srcRec->createDate);
1128 srcRec->modifyDate = SWAP_BE32 (srcRec->modifyDate);
1129 srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
1130
1131 /* Don't swap srcRec->userInfo */
1132 /* Don't swap srcRec->finderInfo */
1133 /* Don't swap resserved array */
1134
1135 } else if (srcPtr[0] == kHFSFileRecord) {
1136 HFSCatalogFile *srcRec = (HFSCatalogFile *)srcPtr;
1137 if ((char *)srcRec + sizeof(*srcRec) > nextRecord) {
1138 if (direction == kSwapBTNodeHostToBig) {
1139 panic("hfs_swap_HFSBTInternalNode: catalog file record #%d too big\n", srcDesc->numRecords-i-1);
1140 } else {
1141 printf("hfs_swap_HFSBTInternalNode: catalog file record #%d too big\n", srcDesc->numRecords-i-1);
1142 }
1143 return fsBTInvalidNodeErr;
1144 }
1145
1146 srcRec->flags = srcRec->flags;
1147 srcRec->fileType = srcRec->fileType;
1148
1149 /* Don't swap srcRec->userInfo */
1150
1151 srcRec->fileID = SWAP_BE32 (srcRec->fileID);
1152
1153 srcRec->dataStartBlock = SWAP_BE16 (srcRec->dataStartBlock);
1154 srcRec->dataLogicalSize = SWAP_BE32 (srcRec->dataLogicalSize);
1155 srcRec->dataPhysicalSize = SWAP_BE32 (srcRec->dataPhysicalSize);
1156
1157 srcRec->rsrcStartBlock = SWAP_BE16 (srcRec->rsrcStartBlock);
1158 srcRec->rsrcLogicalSize = SWAP_BE32 (srcRec->rsrcLogicalSize);
1159 srcRec->rsrcPhysicalSize = SWAP_BE32 (srcRec->rsrcPhysicalSize);
1160
1161 srcRec->createDate = SWAP_BE32 (srcRec->createDate);
1162 srcRec->modifyDate = SWAP_BE32 (srcRec->modifyDate);
1163 srcRec->backupDate = SWAP_BE32 (srcRec->backupDate);
1164
1165 /* Don't swap srcRec->finderInfo */
1166
1167 srcRec->clumpSize = SWAP_BE16 (srcRec->clumpSize);
1168
1169 /* Swap the two sets of extents as an array of six (three each) u_int16_t */
1170 for (j = 0; j < kHFSExtentDensity * 2; j++) {
1171 srcRec->dataExtents[j].startBlock = SWAP_BE16 (srcRec->dataExtents[j].startBlock);
1172 srcRec->dataExtents[j].blockCount = SWAP_BE16 (srcRec->dataExtents[j].blockCount);
1173 }
1174
1175 /* Don't swap srcRec->reserved */
1176
1177 } else if ((srcPtr[0] == kHFSFolderThreadRecord) ||
1178 (srcPtr[0] == kHFSFileThreadRecord)) {
1179 HFSCatalogThread *srcRec = (HFSCatalogThread *)srcPtr;
1180
1181 /* Make sure there is room for parentID and name length */
1182 if ((char *) &srcRec->nodeName[1] > nextRecord) {
1183 if (direction == kSwapBTNodeHostToBig) {
1184 panic("hfs_swap_HFSBTInternalNode: catalog thread record #%d too big\n", srcDesc->numRecords-i-1);
1185 } else {
1186 printf("hfs_swap_HFSBTInternalNode: catalog thread record #%d too big\n", srcDesc->numRecords-i-1);
1187 }
1188 return fsBTInvalidNodeErr;
1189 }
1190
1191 /* Don't swap srcRec->reserved array */
1192
1193 srcRec->parentID = SWAP_BE32 (srcRec->parentID);
1194
1195 /* Don't swap srcRec->nodeName */
1196
1197 /* Make sure there is room for the name in the buffer */
1198 if ((char *) &srcRec->nodeName[srcRec->nodeName[0]] > nextRecord) {
1199 if (direction == kSwapBTNodeHostToBig) {
1200 panic("hfs_swap_HFSBTInternalNode: catalog thread record #%d name too big\n", srcDesc->numRecords-i-1);
1201 } else {
1202 printf("hfs_swap_HFSBTInternalNode: catalog thread record #%d name too big\n", srcDesc->numRecords-i-1);
1203 }
1204 return fsBTInvalidNodeErr;
1205 }
1206 } else {
1207 if (direction == kSwapBTNodeHostToBig) {
1208 panic("hfs_swap_HFSBTInternalNode: unrecognized catalog record type (0x%04X; record #%d)\n", srcPtr[0], srcDesc->numRecords-i-1);
1209 } else {
1210 printf("hfs_swap_HFSBTInternalNode: unrecognized catalog record type (0x%04X; record #%d)\n", srcPtr[0], srcDesc->numRecords-i-1);
1211 }
1212 return fsBTInvalidNodeErr;
1213 }
1214
1215 /* We can swap the record type now that we're done using it */
1216 if (direction == kSwapBTNodeHostToBig)
1217 srcPtr[0] = SWAP_BE16 (srcPtr[0]);
1218 }
1219
1220 } else {
1221 panic ("hfs_swap_HFSBTInternalNode: fileID %u is not a system B-tree\n", fileID);
1222 }
1223
1224 return (0);
1225 }
1226 #endif
1227
mirror of hfs