1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
|
/*--[litheaders.c]-------------------------------------------------------------
| Copyright (C) 2002 Dan A. Jackson
|
| This file is part of the "openclit" library for processing .LIT files.
|
| "Openclit" is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2 of the License, or
| (at your option) any later version.
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with this program; if not, write to the Free Software
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
| The GNU General Public License may also be available at the following
| URL: http://www.gnu.org/licenses/gpl.html
*/
/* This file contains routines for reading and writing to the .LIT headers */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "litlib.h"
#include "litinternal.h"
int make_secondary_header(lit_file * litfile, int sizeHeaders,
dir_type * dir,U8 ** pPtr,int * psize);
/* LIT HEADER STRUCTURE *****************************************************
+-----------------------------+
| |
| Primary Header |
| |
+-----------------------------+
| Piece Structures |
| -- Offset |*-------------------+
| -- Length |*---------------+ |
| |*-----------+ | |
| |*-------+ | | |
| |*---+ | | | |
+-----------------------------+ | | | | |
| | | | | | |
| Secondary Header | | | | | |
+-*| (Content Length) | | | | | |
| +-----------------------------+ | | | | |
| | | | | |
| | | | | |
| +-----------------------------+ | | | | |
| | Piece 0 Data |<---+ | | | |
| | Total File Length | | | | |
| +-----------------------------+ | | | |
| | | | |
| | | | |
| +-----------------------------+ | | | |
| | Piece 1 Data |<-------+ | | |
| | Internal Directory | | | |
| | | | | |
| +-----------------------------+ | | |
| | | |
| | | |
| +-----------------------------+ | | |
| | Piece 2 Data |<-----------+ | |
| | Index information for | | |
| | internal directory | | |
| +-----------------------------+ | |
| | |
| | |
| +-----------------------------+ | |
| | Piece 3 Data |<---------------+ |
| | GUID (0A9007C3-7640-D311- | |
| | 87890000F8105754} | |
| +-----------------------------+ |
| |
| +-----------------------------+ |
| | Piece 4 Data |<-------------------+
| | GUID (0A9007C4-7640-D311- |
| | 87890000F8105754} |
| +-----------------------------+
|
|
+->+-----------------------------+
| Section 0 |
| |
. .
. ... remainder of the file .
. .
| |
| |
+-----------------------------+
**************************************************************************/
/** Primary Header *******************************************************
+-------------------------------+--------------------------------+
| 'ITOLITLS' signature |
+-------------------------------+--------------------------------+
| Version | Primary Header Length |
+-------------------------------+--------------------------------+
| Number of Pieces | Secondary Header Length |
+-------------------------------+--------------------------------+
| File GUID (0A9007C1-7640-D311-87890000F8105754} |
+ +
| |
+-------------------------------+--------------------------------+
**************************************************************************/
#define PRI_VERSION 8
#define PRI_HDRLEN 12
#define PRI_NUMPIECES 16
#define PRI_SECHDRLEN 20
#define PRI_GUID 24
#define PRI_SIZE 40
static const char * lit_magic_string = "ITOLITLS";
/** Piece structures ******************************************************
+----------------------------------------------------------------+
| Piece Offset (Low Dword) . Piece Offset (High Dword) |
+----------------------------------------------------------------+
| Piece Size (Low Dword) . Piece Size (High Dword) |
+----------------------------------------------------------------+
**************************************************************************/
#define PIECE_LOW_OFFSET 0
#define PIECE_HIGH_OFFSET 4
#define PIECE_LOW_SIZE 8
#define PIECE_HIGH_SIZE 12
#define PIECE_SIZE 16
/** PIECE 0 of the header -- File size ***********************************
+-------------------------------+--------------------------------+
| 0x1FE (Tag) | 0 (Version) |
+-------------------------------+--------------------------------+
| File Length |
+-------------------------------+--------------------------------+
| 0 -- Unknown |
+----------------------------------------------------------------+
Version 2 -- Speculation only, because I have no idea how to get the
"real" file length from this version.
+-------------------------------+--------------------------------+
| 0x1FE (Tag) | 2 (Version) |
+-------------------------------+--------------------------------+
| Content Offset (? Could be a coincidence !) |
+-------------------------------+--------------------------------+
| 0 -- Unknown |
+----------------------------------------------------------------+
| Offset (points to a version 0, 0x1FE block but smaller length |
+----------------------------------------------------------------+
| Size (0x18), normal for verison 0, 0x1FE block |
+----------------------------------------------------------------+
| Offset (points to an **empty** IFCM block) |
+----------------------------------------------------------------+
| Size (0x20), minimum size for an IFCM block) |
+----------------------------------------------------------------+
*************************************************************************/
#define SIZEPIECE_TAG 0x1FE
#define SIZEPIECE_SIZE 24
#define SIZEPIECE_VERSION 4
#define SIZEPIECE_FILESIZE 8
/*** COMMON BLOCK FORMAT **************************************************
+-------------------------------+--------------------------------+
| Block Type | Block Version |
+-------------------------------+--------------------------------+
| Block Size (bytes) |
+-------------------------------+
*************************************************************************/
#define LIT_BLOCK_TAG 0
#define LIT_BLOCK_VER 4
#define LIT_BLOCK_LEN 8
/*--[lit_i_read_headers]-------------------------------------------------------
| Here I read the header area of the .LIT file into the working structure.
| The main information extracted from the header:
| Content Offset
| Directory Table
| Total file length
|
*/
int lit_i_read_headers(lit_file * litfile)
{
U8 * header = NULL, * cur_piece = NULL;
int r;
int i, total_hdr_size;
/* Primary Header Fields */
U32 version;
int sec_hdr_len, hdr_len, num_pieces;
/* Piece information */
U32 offset;
int size;
if (litfile->filesize < PRI_SIZE) {
lit_error(ERR_R,"LIT FORMAT ERROR: File is too small. "
"Is %d bytes, must be at least %d bytes!", litfile->filesize,
PRI_SIZE);
return E_LIT_FORMAT_ERROR;
}
header = litfile->readat(litfile->file_pointer, 0, PRI_SIZE);
if (!header) {
return E_LIT_READ_ERROR;
}
if (strncmp(header, lit_magic_string, strlen(lit_magic_string)) != 0) {
lit_error(ERR_R,"This file does not appear to be a .LIT file.");
free(header);
return E_LIT_FORMAT_ERROR;
}
version = READ_U32(header+PRI_VERSION);
hdr_len = READ_INT32(header+PRI_HDRLEN);
num_pieces = READ_INT32(header+PRI_NUMPIECES);
sec_hdr_len = READ_INT32(header+PRI_SECHDRLEN);
if (version != 1) {
lit_error(ERR_R,
"I only handle version 1, this file is version %d.",
(int)version);
free(header);
return E_LIT_NEWER_VERSION;
}
memcpy(litfile->header_guid, header + PRI_GUID, 16);
free(header);
header = NULL;
total_hdr_size = hdr_len + num_pieces*PIECE_SIZE + sec_hdr_len;
if ((size_t)total_hdr_size >= litfile->filesize) {
lit_error(ERR_R, "LIT FORMAT ERROR: File is too small for header.");
return E_LIT_FORMAT_ERROR;
}
header = litfile->readat(litfile->file_pointer, 0, total_hdr_size);
if (!header) return E_LIT_READ_ERROR;
r = lit_i_read_secondary_header(litfile,
header+hdr_len+num_pieces*PIECE_SIZE, sec_hdr_len);
if (r) {
free(header);
return r;
}
for (i = 0; i < num_pieces; i++)
{
if ( READ_U32(header + hdr_len + i*PIECE_SIZE + PIECE_HIGH_OFFSET) ||
READ_U32(header + hdr_len + i*PIECE_SIZE + PIECE_HIGH_SIZE) ) {
lit_error(ERR_R," Piece %i has 64bit value -- Offset: %lx:%lx, "
"Size: %lx:%lx", i,
READ_U32(header + hdr_len +i*PIECE_SIZE+PIECE_HIGH_OFFSET),
READ_U32(header + hdr_len +i*PIECE_SIZE+PIECE_LOW_OFFSET),
READ_U32(header + hdr_len +i*PIECE_SIZE+PIECE_HIGH_SIZE),
READ_U32(header + hdr_len +i*PIECE_SIZE+PIECE_LOW_SIZE));
free(header);
return E_LIT_64BIT_VALUE;
}
offset = READ_U32(header + hdr_len + i*PIECE_SIZE + PIECE_LOW_OFFSET);
size = READ_INT32(header + hdr_len + i*PIECE_SIZE + PIECE_LOW_SIZE);
if ( (offset+size) > litfile->filesize) {
lit_error(ERR_R,"LIT FORMAT ERROR:"
"PIECE %d (Ofs:%lx Size %d) is outside length %d!",
i, offset, size, (int)litfile->filesize);
free(header);
return E_LIT_FORMAT_ERROR;
}
cur_piece = litfile->readat(litfile->file_pointer, offset, size);
if (!cur_piece) {
free(header);
return E_LIT_READ_ERROR;
}
switch (i)
{
case 0:
/* Handling this is too much bother,
* Version 2 of the header appears to have a second level of piece tables
* which is just more trouble than it is worth.
* "freeLIT" can create files with version 2 for those interested.
* Since I already know what the length SHOULD be (unless someone mangled
* the file with an ASCII ftp transfer, and that would break other things),
* there is really little reason YET to process this piece. */
#if 0
if ((size < SIZEPIECE_SIZE) ||
(READ_U32(cur_piece) != SIZEPIECE_TAG))
{
lit_error(ERR_R,"LIT FORMAT ERROR:"
"PIECE %d has invalid size (%d) or tag value (%08lx).",
i, size, READ_U32(cur_piece));
free(header);
free(cur_piece);
return E_LIT_FORMAT_ERROR;
}
if (READ_U32(cur_piece + SIZEPIECE_FILESIZE + 4)) {
lit_error(ERR_R,"LIT FILE HAS 64-BIT FILE SIZE: %08lx:%08lx!",
READ_U32(cur_piece+SIZEPIECE_FILESIZE+4),
READ_U32(cur_piece+SIZEPIECE_FILESIZE));
free(header);
free(cur_piece);
return E_LIT_64BIT_VALUE;
}
filesize = READ_U32(cur_piece + SIZEPIECE_FILESIZE);
/* Having more bytes isn't a problem, at least not for
* this code. MSREADER doesn't like it though. */
if (filesize < litfile->filesize) {
lit_error(ERR_R,"LIT FILE ERROR - "
"File thinks it has %d bytes, but I really have %d.",
(int)filesize, litfile->filesize);
free(header);
free(cur_piece);
return E_LIT_FORMAT_ERROR;
}
#endif
break;
case 1:
if ((READ_U32(cur_piece + 8)!= litfile->entry_chunklen) ||
(READ_U32(cur_piece + 12)!=litfile->entry_unknown) ) {
lit_error(ERR_R,"LIT FORMAT ERROR: Secondary header is wrong."
"(SecHdr) Len: %lx, Unk: %lx (Piece) Len: %lx Unk: %lx\n",
litfile->entry_chunklen, litfile->entry_unknown,
READ_U32(cur_piece + 8),
READ_U32(cur_piece + 12));
return E_LIT_FORMAT_ERROR;
}
r = lit_i_read_directory(litfile,cur_piece,size);
if (r) {
free(header); free(cur_piece);
return r;
}
break;
case 2:
if ((READ_U32(cur_piece + 8)!= litfile->count_chunklen) ||
(READ_U32(cur_piece + 12)!=litfile->count_unknown) ) {
lit_error(ERR_R,"LIT FORMAT ERROR: Secondary header is wrong."
"(SecHdr) Len: %lx, Unk: %lx (Piece) Len: %lx Unk: %lx\n",
litfile->count_chunklen, litfile->count_unknown,
READ_U32(cur_piece + 8),
READ_U32(cur_piece + 12));
return E_LIT_FORMAT_ERROR;
}
/* There is no information I need from this piece */
break;
case 3:
if (size != sizeof(litfile->piece3_guid)) {
lit_error(ERR_R,"LIT FORMAT ERROR: Piece %d's size is %d, "
"expected %d!",i,size, sizeof(litfile->piece3_guid));
free(header);
free(cur_piece);
return E_LIT_FORMAT_ERROR;
}
memcpy(litfile->piece3_guid, cur_piece, size);
break;
case 4:
if (size != sizeof(litfile->piece4_guid)) {
lit_error(ERR_R,"LIT FORMAT ERROR: Piece %d's size is %d, "
"expected %d!",i,size, sizeof(litfile->piece4_guid));
free(header);
free(cur_piece);
return E_LIT_FORMAT_ERROR;
}
memcpy(litfile->piece4_guid, cur_piece, size);
break;
}
free(cur_piece);
cur_piece = NULL;
}
free(header);
header = NULL;
return 0;
}
#define WRITE_HDR_PIECE(pointer,size) \
{\
WRITE_U32((p + PIECE_LOW_OFFSET), offset);\
WRITE_U32((p + PIECE_HIGH_OFFSET), 0);\
WRITE_U32((p + PIECE_LOW_SIZE), size);\
WRITE_U32((p + PIECE_HIGH_SIZE), 0);\
status = litfile->writeat(litfile->file_pointer,offset,pointer,\
size);\
if (status != size) goto bad;\
p += PIECE_SIZE;\
offset += size;\
}
/*****************************************************************************/
/*--[lit_i_write_headers]------------------------------------------------------
|
| This writes out the headers of a .LIT file.
*/
int lit_i_write_headers(lit_file * litfile)
{
dir_type dir;
int status;
U8 * pHdr = NULL, * pSecHdr = NULL, * p;
int sizeHdr, offset, sizeHeaders, sizeSecHdr;
/* this is small enough to fake */
U8 sizePiece[SIZEPIECE_SIZE];
memset(&dir, 0, sizeof(dir));
status = lit_i_make_directories(litfile,&dir);
if (status) goto bad;
sizeHdr = PRI_SIZE + 5*PIECE_SIZE;
pHdr = (U8 *)malloc( (int)sizeHdr);
if (!pHdr) {
lit_error(ERR_W|ERR_LIBC, "Out of memory writing headers (%d).\n",
sizeHdr);
status = E_LIT_OUT_OF_MEMORY;
goto bad;
}
/* Need to figure out everything EXCEPT the secondary header size,
| which lit_i_make_secondary_header will know, and the total is the
| content offset which gets stored in the secondary header */
sizeHeaders = sizeHdr+SIZEPIECE_SIZE+dir.entry_size+dir.count_size+2*16;
status = make_secondary_header(litfile,sizeHeaders, &dir,&pSecHdr,
&sizeSecHdr);
if (status) goto bad;
status = litfile->writeat(litfile->file_pointer,sizeHdr,pSecHdr,sizeSecHdr);
if (status != sizeSecHdr) goto bad;
sizeHeaders += sizeSecHdr;
litfile->content_offset = sizeHeaders;
p = sizePiece;
memset(p, 0, SIZEPIECE_SIZE);
WRITE_U32(p, SIZEPIECE_TAG);
WRITE_U32(p + SIZEPIECE_FILESIZE, sizeHeaders + dir.total_content_size);
/* Create Primary header */
p = pHdr;
memcpy(p, lit_magic_string, strlen(lit_magic_string));
WRITE_U32((p + PRI_VERSION), 1);
WRITE_U32((p + PRI_HDRLEN), PRI_SIZE);
WRITE_U32((p + PRI_NUMPIECES), 5);
WRITE_U32((p + PRI_SECHDRLEN), sizeSecHdr);
memcpy(p+PRI_GUID, litfile->header_guid, 16);
offset = sizeHdr + sizeSecHdr;
p = pHdr + PRI_SIZE;
WRITE_HDR_PIECE(sizePiece, SIZEPIECE_SIZE);
WRITE_HDR_PIECE(dir.entry_ptr,(int)dir.entry_size);
WRITE_HDR_PIECE(dir.count_ptr,(int)dir.count_size);
WRITE_HDR_PIECE(litfile->piece3_guid, 16);
WRITE_HDR_PIECE(litfile->piece4_guid, 16);
status = litfile->writeat(litfile->file_pointer,0,pHdr,sizeHdr);
if (status != sizeHdr) goto bad;
free(pSecHdr);
free(pHdr);
lit_i_free_dir_type(&dir);
return 0;
bad:
lit_i_free_dir_type(&dir);
if (pHdr) free(pHdr);
if (pSecHdr) free(pSecHdr);
return status;
}
/** SECONDARY HEADER FORMAT *********************************************
Mostly in "COMMON BLOCK FORMAT"
+-------------------------------+--------------------------------+
| Block Type | Block Version |
+-------------------------------+--------------------------------+
| Block Size (bytes) |
+-------------------------------+
Specifically (Note the first block is missing the type... )
+-------------------------------+--------------------------------+
| Version (2) | Block Length (0x98) |
+-------------------------------+--------------------------------+ +8
| Chunk Index of first "AOLI" or "Index Chunk" in FILE |
| directory (0xFFFFFFFF if no index chunk is present) |
+----------------------------------------------------------------+ +16
| 0 -- Unknown |
+----------------------------------------------------------------+ +24
| Chunk index of LAST "AOLL" or "List Chunk" in FILE directory |
+----------------------------------------------------------------+ +32
| 0 -- Unknown |
+-------------------------------+--------------------------------+ +40
| Chunk Size of List Chunks (?) | Unknown (always 2) |
| in FILE directory (0x2000) | |
+-------------------------------+--------------------------------+ +48
| 0 -- Unknown | Depth of FILE directory |
| | (2 with an AOLI, 1 normally) |
+-------------------------------+--------------------------------+ +56
| 0 -- Unknown |
+-------------------------------+--------------------------------+ +64
| Total number of FILE entries | 0 -- Unknown |
+-------------------------------+--------------------------------+ +72
| Chunk Index of first "AOLI" or "Index Chunk" in ENTRY COUNTS |
| directory (0xFFFFFFFF if no index chunk is present) |
+----------------------------------------------------------------+ +80
| 0 -- Unknown |
+----------------------------------------------------------------+ +88
| Chunk index of LAST "AOLL" or "List Chunk" in COUNTS directory |
+----------------------------------------------------------------+ +96
| 0 -- Unknown |
+-------------------------------+--------------------------------+ +104
| Chunk Size of List Chunks (?) | Unknown (always 2) |
| in COUNTS directory (0x200) | |
+-------------------------------+--------------------------------+ +112
| 0 -- Unknown | Depth of COUNTS directory |
| | (2 with an AOLI, 1 normally) |
+-------------------------------+--------------------------------+ +120
| 0 -- Unknown |
+-------------------------------+--------------------------------+ +128
| Total number of COUNTS entries| 0 -- Unknown |
+-------------------------------+--------------------------------+ +136
| 0x100000 - Unknown, same as in| 0x20000 -- Unknown, same as in |
| first IFCM of FILE directory | first IFCM of COUNTS directory |
+-------------------------------+--------------------------------+ +144
| 0 -- Unknown |
+----------------------------------------------------------------+ +152
| 'CAOL' - Block Tag | Block version (2) |
+-------------------------------+--------------------------------+
| Block Length (0x50) | Unknown (? - MSREADER IGNORES) |
| | (may be a creator ID?) |
+-------------------------------+--------------------------------+
| 0 -- Unknown | 0x2000 (Chunk size of Entries) |
+-------------------------------+--------------------------------+
| 0x200 (Chunk size of COUNTS) | 0x100000 (Unknown, see above) |
+-------------------------------+--------------------------------+
| 0x20000 (Unknown, like above) | 0 -- Unknown |
+-------------------------------+--------------------------------+
| 0 -- Unknown |
+-------------------------------+--------------------------------+
| 'ITSF' - Block Tag | Block version (4) |
+-------------------------------+--------------------------------+
| Block Length (0x20) | 0x01 (Unknown) |
+-------------------------------+--------------------------------+
| Content Offset |
+-------------------------------+--------------------------------+
| Timestamp (?) | Windows Language ID (0x409) |
+-------------------------------+--------------------------------+
*********************************************************************/
#define SECHDR_BLOCK_VER 0
#define SECHDR_BLOCK_LEN 4
#define SECHDR_ENTRY_AOLI_IDX 8
#define SECHDR_ENTRY_LAST_AOLL 24
#define SECHDR_ENTRY_CHUNKLEN 40
#define SECHDR_ENTRY_TWO 44
#define SECHDR_ENTRY_DEPTH 52
#define SECHDR_ENTRY_ENTRIES 64
#define SECHDR_COUNT_AOLI_IDX 72
#define SECHDR_COUNT_LAST_AOLL 88
#define SECHDR_COUNT_CHUNKLEN 104
#define SECHDR_COUNT_TWO 108
#define SECHDR_COUNT_DEPTH 116
#define SECHDR_COUNT_ENTRIES 128
#define SECHDR_ENTRY_UNKNOWN 136
#define SECHDR_COUNT_UNKNOWN 140
#define SECHDR_VERSION 2
#define SECHDR_SIZE 152
#define CAOL_TAG 0x4c4f4143
#define CAOL_SIZE 48
#define CAOL_VERSION 2
#define CAOL_CREATOR_ID 12
#define CAOL_ENTRY_CHUNKLEN 20
#define CAOL_COUNT_CHUNKLEN 24
#define CAOL_ENTRY_UNKNOWN 28
#define CAOL_COUNT_UNKNOWN 32
#define ITSF_TAG 0x46535449
#define ITSF_VERSION 4
#define ITSF_SIZE 32
#define ITSF_UNKNOWN 12
#define ITSF_CONTENT_OFFSET 16
#define ITSF_TIMESTAMP 24
#define ITSF_LANGUAGE_ID 28
/*--[lit_i_read_secondary_header]----------------------------------------------
|
| Reads useful fields from the secondary header into the lit_file block.
| This processes the secondary header as if it were made up of subblocks,
| each with their own tag, version and length. This may not be correct for
| future versions.
|
| Note that a lot of these fields appear redundant, and are unnecessary
| in processing .LIT files. Possibly these are vestiges of the storage
| layer, or have some meaning on occasional files which haven't been
| observed yet.
*/
int lit_i_read_secondary_header(lit_file * litfile, U8 * hdr, int len)
{
int blocklen, offset;
U32 blocktype, blockver;
litfile->content_offset = 0;
/* All the fields in the main header are unnecessary from the simplistic
* directory parsing methodology.
* These include the offsets to the index chunks for faster directory
* processing, but with less than a hundred entries in most cases, there
* is really little point. */
/* Note special case -- TAG is missing, so use -4 */
offset = READ_INT32(hdr+LIT_BLOCK_LEN - 4);
blocktype = 0;
while (offset < len) {
blocktype = READ_U32(hdr+offset+LIT_BLOCK_TAG);
blockver = READ_U32(hdr+offset+LIT_BLOCK_VER);
blocklen = READ_INT32(hdr+offset+LIT_BLOCK_LEN);
if (blocklen < 0) break;
switch (blocktype)
{
case CAOL_TAG:
if (blockver != 2) {
lit_error(ERR_R, "This file is a newer LIT format -"
"I expected CAOL version 2, this is %ld!",
(U32)blockver);
return E_LIT_NEWER_VERSION;
}
litfile->creator_id = READ_U32(hdr+offset+CAOL_CREATOR_ID);
litfile->entry_chunklen = READ_U32(hdr+offset+CAOL_ENTRY_CHUNKLEN);
litfile->count_chunklen = READ_U32(hdr+offset+CAOL_COUNT_CHUNKLEN);
litfile->entry_unknown = READ_U32(hdr+offset+CAOL_ENTRY_UNKNOWN);
litfile->count_unknown = READ_U32(hdr+offset+CAOL_COUNT_UNKNOWN);
/* Cheat - point to the embedded ITSF header */
blocklen = 48;
break;
case ITSF_TAG:
if (blockver != 4) {
lit_error(ERR_R, "This file is a newer LIT format -"
" I expected ITSF version 4, this is %ld!",
blockver);
return E_LIT_NEWER_VERSION;
}
if (READ_U32(hdr+offset+ITSF_CONTENT_OFFSET+4)) {
lit_error(ERR_R, "This file has a 64-bit content offset!");
return E_LIT_64BIT_VALUE;
}
litfile->timestamp = READ_U32(hdr+offset+ITSF_TIMESTAMP);
litfile->language_id = READ_U32(hdr+offset+ITSF_LANGUAGE_ID);
litfile->content_offset = READ_U32(hdr+offset+ITSF_CONTENT_OFFSET);
break;
}
offset += blocklen;
}
if (offset != len) {
lit_error(ERR_R,"Secondary header offset %ld "
"ended up outside length %ld.", (U32)offset, (U32)len);
return E_LIT_FORMAT_ERROR;
}
if (litfile->content_offset == 0) {
lit_error(ERR_R,"I was unable to figure out the content offset!");
return E_LIT_FORMAT_ERROR;
}
return 0;
}
/*****************************************************************************/
/*--[make_secondary_header]----------------------------------------------------
|
|
*/
int make_secondary_header(lit_file * litfile, int sizeHeaders,
dir_type * dir,U8 ** pPtr,int * pSize)
{
U8 * pSecHdr, *p;
int size;
size = SECHDR_SIZE + CAOL_SIZE + ITSF_SIZE;
pSecHdr = malloc(size);
if (!pSecHdr) {
lit_error(ERR_R|ERR_LIBC,"Unable to malloc %d bytes for headers.\n",
size);
return E_LIT_OUT_OF_MEMORY;
}
memset(pSecHdr, 0, size);
p = pSecHdr;
WRITE_U32(p+SECHDR_BLOCK_VER, SECHDR_VERSION);
WRITE_U32(p+SECHDR_BLOCK_LEN, SECHDR_SIZE);
if (dir->entry_aoli_idx == (U32)-1) {
WRITE_U32(p+SECHDR_ENTRY_AOLI_IDX+4, (U32)-1);
WRITE_U32(p+SECHDR_ENTRY_DEPTH, 1);
} else {
WRITE_U32(p+SECHDR_ENTRY_AOLI_IDX+4, (U32)0);
WRITE_U32(p+SECHDR_ENTRY_DEPTH, 2);
}
WRITE_U32(p+SECHDR_ENTRY_AOLI_IDX, dir->entry_aoli_idx);
WRITE_U32(p+SECHDR_ENTRY_LAST_AOLL, dir->entry_last_chunk);
WRITE_U32(p+SECHDR_ENTRY_CHUNKLEN, litfile->entry_chunklen);
WRITE_U32(p+SECHDR_ENTRY_TWO, 2);
WRITE_U32(p+SECHDR_ENTRY_ENTRIES, (U32)dir->num_entries);
/* COUNT parameters are fixed -- there is no AOLI, and only ONE AOLL */
WRITE_U32(p+SECHDR_COUNT_AOLI_IDX, (U32)-1);
WRITE_U32(p+SECHDR_COUNT_AOLI_IDX+4, (U32)-1);
WRITE_U32(p+SECHDR_COUNT_LAST_AOLL, dir->count_last_chunk);
WRITE_U32(p+SECHDR_COUNT_CHUNKLEN, litfile->count_chunklen);
WRITE_U32(p+SECHDR_COUNT_TWO, 2);
WRITE_U32(p+SECHDR_COUNT_DEPTH, 1);
WRITE_U32(p+SECHDR_COUNT_ENTRIES, dir->num_counts);
WRITE_U32(p+SECHDR_ENTRY_UNKNOWN, litfile->entry_unknown);
WRITE_U32(p+SECHDR_COUNT_UNKNOWN, litfile->count_unknown);
p += SECHDR_SIZE;
WRITE_U32(p+LIT_BLOCK_TAG, CAOL_TAG);
WRITE_U32(p+LIT_BLOCK_VER, CAOL_VERSION);
WRITE_U32(p+LIT_BLOCK_LEN, CAOL_SIZE + ITSF_SIZE);
WRITE_U32(p + CAOL_CREATOR_ID, litfile->creator_id);
WRITE_U32(p + CAOL_ENTRY_CHUNKLEN, litfile->entry_chunklen);
WRITE_U32(p + CAOL_COUNT_CHUNKLEN, litfile->count_chunklen);
WRITE_U32(p + CAOL_ENTRY_UNKNOWN, litfile->entry_unknown);
WRITE_U32(p + CAOL_COUNT_UNKNOWN, litfile->count_unknown);
p += CAOL_SIZE;
WRITE_U32(p + LIT_BLOCK_TAG, ITSF_TAG);
WRITE_U32(p + LIT_BLOCK_VER, ITSF_VERSION);
WRITE_U32(p + LIT_BLOCK_LEN, ITSF_SIZE);
WRITE_U32(p + ITSF_UNKNOWN, 1);
WRITE_U32(p + ITSF_CONTENT_OFFSET, sizeHeaders + size);
WRITE_U32(p + ITSF_TIMESTAMP, litfile->timestamp);
WRITE_U32(p + ITSF_LANGUAGE_ID, litfile->language_id);
if (pPtr) *pPtr = pSecHdr;
if (pSize) *pSize = size;
return 0;
}
|
