forked from sqlcipher/sqlcipher
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathshowdb.c
1251 lines (1186 loc) · 33.3 KB
/
showdb.c
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
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
** A utility for printing all or part of an SQLite database file.
*/
#include <stdio.h>
#include <ctype.h>
#define ISDIGIT(X) isdigit((unsigned char)(X))
#define ISPRINT(X) isprint((unsigned char)(X))
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#if !defined(_MSC_VER)
#include <unistd.h>
#else
#include <io.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "sqlite3.h"
typedef unsigned char u8; /* unsigned 8-bit */
typedef unsigned int u32; /* unsigned 32-bit */
typedef sqlite3_int64 i64; /* signed 64-bit */
typedef sqlite3_uint64 u64; /* unsigned 64-bit */
static struct GlobalData {
u32 pagesize; /* Size of a database page */
int dbfd; /* File descriptor for reading the DB */
u32 mxPage; /* Last page number */
int perLine; /* HEX elements to print per line */
int bRaw; /* True to access db file via OS APIs */
sqlite3_file *pFd; /* File descriptor for non-raw mode */
sqlite3 *pDb; /* Database handle that owns pFd */
} g = {1024, -1, 0, 16, 0, 0, 0};
/*
** Convert the var-int format into i64. Return the number of bytes
** in the var-int. Write the var-int value into *pVal.
*/
static int decodeVarint(const unsigned char *z, i64 *pVal){
i64 v = 0;
int i;
for(i=0; i<8; i++){
v = (v<<7) + (z[i]&0x7f);
if( (z[i]&0x80)==0 ){ *pVal = v; return i+1; }
}
v = (v<<8) + (z[i]&0xff);
*pVal = v;
return 9;
}
/*
** Extract a big-endian 32-bit integer
*/
static u32 decodeInt32(const u8 *z){
return (z[0]<<24) + (z[1]<<16) + (z[2]<<8) + z[3];
}
/* Report an out-of-memory error and die.
*/
static void out_of_memory(void){
fprintf(stderr,"Out of memory...\n");
exit(1);
}
/*
** Open a database connection.
*/
static sqlite3 *openDatabase(const char *zPrg, const char *zName){
sqlite3 *db = 0;
int flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_URI;
int rc = sqlite3_open_v2(zName, &db, flags, 0);
if( rc!=SQLITE_OK ){
const char *zErr = sqlite3_errmsg(db);
fprintf(stderr, "%s: can't open %s (%s)\n", zPrg, zName, zErr);
sqlite3_close(db);
exit(1);
}
return db;
}
/**************************************************************************
** Beginning of low-level file access functions.
**
** All low-level access to the database file read by this program is
** performed using the following four functions:
**
** fileOpen() - open the db file
** fileClose() - close the db file
** fileRead() - read raw data from the db file
** fileGetsize() - return the size of the db file in bytes
*/
/*
** Open the database file.
*/
static void fileOpen(const char *zPrg, const char *zName){
assert( g.dbfd<0 );
if( g.bRaw==0 ){
int rc;
void *pArg = (void *)(&g.pFd);
g.pDb = openDatabase(zPrg, zName);
rc = sqlite3_file_control(g.pDb, "main", SQLITE_FCNTL_FILE_POINTER, pArg);
if( rc!=SQLITE_OK ){
fprintf(stderr,
"%s: failed to obtain fd for %s (SQLite too old?)\n", zPrg, zName
);
exit(1);
}
}else{
g.dbfd = open(zName, O_RDONLY);
if( g.dbfd<0 ){
fprintf(stderr,"%s: can't open %s\n", zPrg, zName);
exit(1);
}
}
}
/*
** Close the database file opened by fileOpen()
*/
static void fileClose(){
if( g.bRaw==0 ){
sqlite3_close(g.pDb);
g.pDb = 0;
g.pFd = 0;
}else{
close(g.dbfd);
g.dbfd = -1;
}
}
/*
** Read content from the file.
**
** Space to hold the content is obtained from sqlite3_malloc() and needs
** to be freed by the caller.
*/
static unsigned char *fileRead(sqlite3_int64 ofst, int nByte){
unsigned char *aData;
int got;
aData = sqlite3_malloc64(32+(i64)nByte);
if( aData==0 ) out_of_memory();
memset(aData, 0, nByte+32);
if( g.bRaw==0 ){
int rc = g.pFd->pMethods->xRead(g.pFd, (void*)aData, nByte, ofst);
if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){
fprintf(stderr, "error in xRead() - %d\n", rc);
exit(1);
}
}else{
lseek(g.dbfd, (long)ofst, SEEK_SET);
got = read(g.dbfd, aData, nByte);
if( got>0 && got<nByte ) memset(aData+got, 0, nByte-got);
}
return aData;
}
/*
** Return the size of the file in byte.
*/
static i64 fileGetsize(void){
i64 res = 0;
if( g.bRaw==0 ){
int rc = g.pFd->pMethods->xFileSize(g.pFd, &res);
if( rc!=SQLITE_OK ){
fprintf(stderr, "error in xFileSize() - %d\n", rc);
exit(1);
}
}else{
struct stat sbuf;
fstat(g.dbfd, &sbuf);
res = (sqlite3_int64)(sbuf.st_size);
}
return res;
}
/*
** End of low-level file access functions.
**************************************************************************/
/*
** Print a range of bytes as hex and as ascii.
*/
static unsigned char *print_byte_range(
sqlite3_int64 ofst, /* First byte in the range of bytes to print */
int nByte, /* Number of bytes to print */
int printOfst /* Add this amount to the index on the left column */
){
unsigned char *aData;
int i, j;
const char *zOfstFmt;
if( ((printOfst+nByte)&~0xfff)==0 ){
zOfstFmt = " %03x: ";
}else if( ((printOfst+nByte)&~0xffff)==0 ){
zOfstFmt = " %04x: ";
}else if( ((printOfst+nByte)&~0xfffff)==0 ){
zOfstFmt = " %05x: ";
}else if( ((printOfst+nByte)&~0xffffff)==0 ){
zOfstFmt = " %06x: ";
}else{
zOfstFmt = " %08x: ";
}
aData = fileRead(ofst, nByte);
for(i=0; i<nByte; i += g.perLine){
int go = 0;
for(j=0; j<g.perLine; j++){
if( i+j>nByte ){ break; }
if( aData[i+j] ){ go = 1; break; }
}
if( !go && i>0 && i+g.perLine<nByte ) continue;
fprintf(stdout, zOfstFmt, i+printOfst);
for(j=0; j<g.perLine; j++){
if( i+j>nByte ){
fprintf(stdout, " ");
}else{
fprintf(stdout,"%02x ", aData[i+j]);
}
}
for(j=0; j<g.perLine; j++){
if( i+j>nByte ){
fprintf(stdout, " ");
}else{
fprintf(stdout,"%c", ISPRINT(aData[i+j]) ? aData[i+j] : '.');
}
}
fprintf(stdout,"\n");
}
return aData;
}
/*
** Print an entire page of content as hex
*/
static void print_page(u32 iPg){
i64 iStart;
unsigned char *aData;
iStart = ((i64)(iPg-1))*g.pagesize;
fprintf(stdout, "Page %u: (offsets 0x%llx..0x%llx)\n",
iPg, iStart, iStart+g.pagesize-1);
aData = print_byte_range(iStart, g.pagesize, 0);
sqlite3_free(aData);
}
/* Print a line of decoded output showing a 4-byte unsigned integer.
*/
static void print_decode_line(
unsigned char *aData, /* Content being decoded */
int ofst, int nByte, /* Start and size of decode */
const char *zMsg /* Message to append */
){
int i, j;
u32 val = aData[ofst];
char zBuf[100];
sprintf(zBuf, " %03x: %02x", ofst, aData[ofst]);
i = (int)strlen(zBuf);
for(j=1; j<4; j++){
if( j>=nByte ){
sprintf(&zBuf[i], " ");
}else{
sprintf(&zBuf[i], " %02x", aData[ofst+j]);
val = val*256 + aData[ofst+j];
}
i += (int)strlen(&zBuf[i]);
}
sprintf(&zBuf[i], " %10u", val);
printf("%s %s\n", zBuf, zMsg);
}
/*
** Decode the database header.
*/
static void print_db_header(void){
unsigned char *aData;
aData = print_byte_range(0, 100, 0);
printf("Decoded:\n");
print_decode_line(aData, 16, 2, "Database page size");
print_decode_line(aData, 18, 1, "File format write version");
print_decode_line(aData, 19, 1, "File format read version");
print_decode_line(aData, 20, 1, "Reserved space at end of page");
print_decode_line(aData, 24, 4, "File change counter");
print_decode_line(aData, 28, 4, "Size of database in pages");
print_decode_line(aData, 32, 4, "Page number of first freelist page");
print_decode_line(aData, 36, 4, "Number of freelist pages");
print_decode_line(aData, 40, 4, "Schema cookie");
print_decode_line(aData, 44, 4, "Schema format version");
print_decode_line(aData, 48, 4, "Default page cache size");
print_decode_line(aData, 52, 4, "Largest auto-vac root page");
print_decode_line(aData, 56, 4, "Text encoding");
print_decode_line(aData, 60, 4, "User version");
print_decode_line(aData, 64, 4, "Incremental-vacuum mode");
print_decode_line(aData, 68, 4, "Application ID");
print_decode_line(aData, 72, 4, "meta[8]");
print_decode_line(aData, 76, 4, "meta[9]");
print_decode_line(aData, 80, 4, "meta[10]");
print_decode_line(aData, 84, 4, "meta[11]");
print_decode_line(aData, 88, 4, "meta[12]");
print_decode_line(aData, 92, 4, "Change counter for version number");
print_decode_line(aData, 96, 4, "SQLite version number");
sqlite3_free(aData);
}
/*
** Describe cell content.
*/
static i64 describeContent(
unsigned char *a, /* Cell content */
i64 nLocal, /* Bytes in a[] */
char *zDesc /* Write description here */
){
i64 nDesc = 0;
int n, j;
i64 i, x, v;
const unsigned char *pData;
const unsigned char *pLimit;
char sep = ' ';
pLimit = &a[nLocal];
n = decodeVarint(a, &x);
pData = &a[x];
a += n;
i = x - n;
while( i>0 && pData<=pLimit ){
n = decodeVarint(a, &x);
a += n;
i -= n;
nLocal -= n;
zDesc[0] = sep;
sep = ',';
nDesc++;
zDesc++;
if( x==0 ){
sprintf(zDesc, "*"); /* NULL is a "*" */
}else if( x>=1 && x<=6 ){
v = (signed char)pData[0];
pData++;
switch( x ){
case 6: v = (v<<16) + (pData[0]<<8) + pData[1]; pData += 2;
case 5: v = (v<<16) + (pData[0]<<8) + pData[1]; pData += 2;
case 4: v = (v<<8) + pData[0]; pData++;
case 3: v = (v<<8) + pData[0]; pData++;
case 2: v = (v<<8) + pData[0]; pData++;
}
sprintf(zDesc, "%lld", v);
}else if( x==7 ){
sprintf(zDesc, "real");
pData += 8;
}else if( x==8 ){
sprintf(zDesc, "0");
}else if( x==9 ){
sprintf(zDesc, "1");
}else if( x>=12 ){
i64 size = (x-12)/2;
if( (x&1)==0 ){
sprintf(zDesc, "blob(%lld)", size);
}else{
sprintf(zDesc, "txt(%lld)", size);
}
pData += size;
}
j = (int)strlen(zDesc);
zDesc += j;
nDesc += j;
}
return nDesc;
}
/*
** Compute the local payload size given the total payload size and
** the page size.
*/
static i64 localPayload(i64 nPayload, char cType){
i64 maxLocal;
i64 minLocal;
i64 surplus;
i64 nLocal;
if( cType==13 ){
/* Table leaf */
maxLocal = g.pagesize-35;
minLocal = (g.pagesize-12)*32/255-23;
}else{
maxLocal = (g.pagesize-12)*64/255-23;
minLocal = (g.pagesize-12)*32/255-23;
}
if( nPayload>maxLocal ){
surplus = minLocal + (nPayload-minLocal)%(g.pagesize-4);
if( surplus<=maxLocal ){
nLocal = surplus;
}else{
nLocal = minLocal;
}
}else{
nLocal = nPayload;
}
return nLocal;
}
/*
** Create a description for a single cell.
**
** The return value is the local cell size.
*/
static i64 describeCell(
unsigned char cType, /* Page type */
unsigned char *a, /* Cell content */
int showCellContent, /* Show cell content if true */
char **pzDesc /* Store description here */
){
int i;
i64 nDesc = 0;
int n = 0;
u32 leftChild;
i64 nPayload;
i64 rowid;
i64 nLocal;
static char zDesc[1000];
i = 0;
if( cType<=5 ){
leftChild = ((a[0]*256 + a[1])*256 + a[2])*256 + a[3];
a += 4;
n += 4;
sprintf(zDesc, "lx: %u ", leftChild);
nDesc = strlen(zDesc);
}
if( cType!=5 ){
i = decodeVarint(a, &nPayload);
a += i;
n += i;
sprintf(&zDesc[nDesc], "n: %lld ", nPayload);
nDesc += strlen(&zDesc[nDesc]);
nLocal = localPayload(nPayload, cType);
}else{
nPayload = nLocal = 0;
}
if( cType==5 || cType==13 ){
i = decodeVarint(a, &rowid);
a += i;
n += i;
sprintf(&zDesc[nDesc], "r: %lld ", rowid);
nDesc += strlen(&zDesc[nDesc]);
}
if( nLocal<nPayload ){
u32 ovfl;
unsigned char *b = &a[nLocal];
ovfl = ((b[0]*256 + b[1])*256 + b[2])*256 + b[3];
sprintf(&zDesc[nDesc], "ov: %u ", ovfl);
nDesc += strlen(&zDesc[nDesc]);
n += 4;
}
if( showCellContent && cType!=5 ){
nDesc += describeContent(a, nLocal, &zDesc[nDesc-1]);
}
*pzDesc = zDesc;
return nLocal+n;
}
/* Print an offset followed by nByte bytes. Add extra white-space
** at the end so that subsequent text is aligned.
*/
static void printBytes(
unsigned char *aData, /* Content being decoded */
unsigned char *aStart, /* Start of content to be printed */
int nByte /* Number of bytes to print */
){
int j;
printf(" %03x: ", (int)(aStart-aData));
for(j=0; j<9; j++){
if( j>=nByte ){
printf(" ");
}else{
printf("%02x ", aStart[j]);
}
}
}
/*
** Write a full decode on stdout for the cell at a[ofst].
** Assume the page contains a header of size szPgHdr bytes.
*/
static void decodeCell(
unsigned char *a, /* Page content (without the page-1 header) */
unsigned pgno, /* Page number */
int iCell, /* Cell index */
int szPgHdr, /* Size of the page header. 0 or 100 */
int ofst /* Cell begins at a[ofst] */
){
int i, j = 0;
u32 leftChild;
i64 k;
i64 nPayload;
i64 rowid;
i64 nHdr;
i64 iType;
i64 nLocal;
unsigned char *x = a + ofst;
unsigned char *end;
unsigned char cType = a[0];
int nCol = 0;
int szCol[2000];
int ofstCol[2000];
int typeCol[2000];
printf("Cell[%d]:\n", iCell);
if( cType<=5 ){
leftChild = ((x[0]*256 + x[1])*256 + x[2])*256 + x[3];
printBytes(a, x, 4);
printf("left child page:: %u\n", leftChild);
x += 4;
}
if( cType!=5 ){
i = decodeVarint(x, &nPayload);
printBytes(a, x, i);
nLocal = localPayload(nPayload, cType);
if( nLocal==nPayload ){
printf("payload-size: %lld\n", nPayload);
}else{
printf("payload-size: %lld (%lld local, %lld overflow)\n",
nPayload, nLocal, nPayload-nLocal);
}
x += i;
}else{
nPayload = nLocal = 0;
}
end = x + nLocal;
if( cType==5 || cType==13 ){
i = decodeVarint(x, &rowid);
printBytes(a, x, i);
printf("rowid: %lld\n", rowid);
x += i;
}
if( nLocal>0 ){
i = decodeVarint(x, &nHdr);
printBytes(a, x, i);
printf("record-header-size: %d\n", (int)nHdr);
j = i;
nCol = 0;
k = nHdr;
while( x+j<=end && j<nHdr ){
const char *zTypeName;
int sz = 0;
char zNm[30];
i = decodeVarint(x+j, &iType);
printBytes(a, x+j, i);
printf("typecode[%d]: %d - ", nCol, (int)iType);
switch( iType ){
case 0: zTypeName = "NULL"; sz = 0; break;
case 1: zTypeName = "int8"; sz = 1; break;
case 2: zTypeName = "int16"; sz = 2; break;
case 3: zTypeName = "int24"; sz = 3; break;
case 4: zTypeName = "int32"; sz = 4; break;
case 5: zTypeName = "int48"; sz = 6; break;
case 6: zTypeName = "int64"; sz = 8; break;
case 7: zTypeName = "double"; sz = 8; break;
case 8: zTypeName = "zero"; sz = 0; break;
case 9: zTypeName = "one"; sz = 0; break;
case 10:
case 11: zTypeName = "error"; sz = 0; break;
default: {
sz = (int)(iType-12)/2;
sprintf(zNm, (iType&1)==0 ? "blob(%d)" : "text(%d)", sz);
zTypeName = zNm;
break;
}
}
printf("%s\n", zTypeName);
szCol[nCol] = sz;
ofstCol[nCol] = (int)k;
typeCol[nCol] = (int)iType;
k += sz;
nCol++;
j += i;
}
for(i=0; i<nCol && ofstCol[i]+szCol[i]<=nLocal; i++){
int s = ofstCol[i];
i64 v;
const unsigned char *pData;
if( szCol[i]==0 ) continue;
printBytes(a, x+s, szCol[i]);
printf("data[%d]: ", i);
pData = x+s;
if( typeCol[i]<=7 ){
v = (signed char)pData[0];
for(k=1; k<szCol[i]; k++){
v = (v<<8) + pData[k];
}
if( typeCol[i]==7 ){
double r;
memcpy(&r, &v, sizeof(r));
printf("%#g\n", r);
}else{
printf("%lld\n", v);
}
}else{
int ii, jj;
char zConst[32];
if( (typeCol[i]&1)==0 ){
zConst[0] = 'x';
zConst[1] = '\'';
for(ii=2, jj=0; jj<szCol[i] && ii<24; jj++, ii+=2){
sprintf(zConst+ii, "%02x", pData[jj]);
}
}else{
zConst[0] = '\'';
for(ii=1, jj=0; jj<szCol[i] && ii<24; jj++, ii++){
zConst[ii] = ISPRINT(pData[jj]) ? pData[jj] : '.';
}
zConst[ii] = 0;
}
if( jj<szCol[i] ){
memcpy(zConst+ii, "...'", 5);
}else{
memcpy(zConst+ii, "'", 2);
}
printf("%s\n", zConst);
}
j = ofstCol[i] + szCol[i];
}
}
if( j<nLocal ){
printBytes(a, x+j, 0);
printf("... %lld bytes of content ...\n", nLocal-j);
}
if( nLocal<nPayload ){
printBytes(a, x+nLocal, 4);
printf("overflow-page: %u\n", decodeInt32(x+nLocal));
}
}
/*
** Decode a btree page
*/
static void decode_btree_page(
unsigned char *a, /* Page content */
int pgno, /* Page number */
int hdrSize, /* Size of the page header. 0 or 100 */
char *zArgs /* Flags to control formatting */
){
const char *zType = "unknown";
int nCell;
int i, j;
int iCellPtr;
int showCellContent = 0;
int showMap = 0;
int cellToDecode = -2;
char *zMap = 0;
switch( a[0] ){
case 2: zType = "index interior node"; break;
case 5: zType = "table interior node"; break;
case 10: zType = "index leaf"; break;
case 13: zType = "table leaf"; break;
}
while( zArgs[0] ){
switch( zArgs[0] ){
case 'c': showCellContent = 1; break;
case 'm': showMap = 1; break;
case 'd': {
if( !ISDIGIT(zArgs[1]) ){
cellToDecode = -1;
}else{
cellToDecode = 0;
while( ISDIGIT(zArgs[1]) ){
zArgs++;
cellToDecode = cellToDecode*10 + zArgs[0] - '0';
}
}
break;
}
}
zArgs++;
}
nCell = a[3]*256 + a[4];
iCellPtr = (a[0]==2 || a[0]==5) ? 12 : 8;
if( cellToDecode>=nCell ){
printf("Page %d has only %d cells\n", pgno, nCell);
return;
}
printf("Header on btree page %d:\n", pgno);
print_decode_line(a, 0, 1, zType);
print_decode_line(a, 1, 2, "Offset to first freeblock");
print_decode_line(a, 3, 2, "Number of cells on this page");
print_decode_line(a, 5, 2, "Offset to cell content area");
print_decode_line(a, 7, 1, "Fragmented byte count");
if( a[0]==2 || a[0]==5 ){
print_decode_line(a, 8, 4, "Right child");
}
if( cellToDecode==(-2) && nCell>0 ){
printf(" key: lx=left-child n=payload-size r=rowid\n");
}
if( showMap ){
zMap = sqlite3_malloc(g.pagesize);
memset(zMap, '.', g.pagesize);
memset(zMap, '1', hdrSize);
memset(&zMap[hdrSize], 'H', iCellPtr);
memset(&zMap[hdrSize+iCellPtr], 'P', 2*nCell);
}
for(i=0; i<nCell; i++){
int cofst = iCellPtr + i*2;
char *zDesc;
i64 n;
cofst = a[cofst]*256 + a[cofst+1];
n = describeCell(a[0], &a[cofst-hdrSize], showCellContent, &zDesc);
if( showMap ){
char zBuf[30];
memset(&zMap[cofst], '*', (size_t)n);
zMap[cofst] = '[';
zMap[cofst+n-1] = ']';
sprintf(zBuf, "%d", i);
j = (int)strlen(zBuf);
if( j<=n-2 ) memcpy(&zMap[cofst+1], zBuf, j);
}
if( cellToDecode==(-2) ){
printf(" %03x: cell[%d] %s\n", cofst, i, zDesc);
}else if( cellToDecode==(-1) || cellToDecode==i ){
decodeCell(a, pgno, i, hdrSize, cofst-hdrSize);
}
}
if( showMap ){
printf("Page map: (H=header P=cell-index 1=page-1-header .=free-space)\n");
for(i=0; (u32)i<g.pagesize; i+=64){
printf(" %03x: %.64s\n", i, &zMap[i]);
}
sqlite3_free(zMap);
}
}
/*
** Decode a freelist trunk page.
*/
static void decode_trunk_page(
u32 pgno, /* The page number */
int detail, /* Show leaf pages if true */
int recursive /* Follow the trunk change if true */
){
u32 i;
u32 n;
unsigned char *a;
while( pgno>0 ){
a = fileRead((pgno-1)*g.pagesize, g.pagesize);
printf("Decode of freelist trunk page %d:\n", pgno);
print_decode_line(a, 0, 4, "Next freelist trunk page");
print_decode_line(a, 4, 4, "Number of entries on this page");
if( detail ){
n = decodeInt32(&a[4]);
for(i=0; i<n && i<g.pagesize/4; i++){
u32 x = decodeInt32(&a[8+4*i]);
char zIdx[13];
sprintf(zIdx, "[%d]", i);
printf(" %5s %7u", zIdx, x);
if( i%5==4 ) printf("\n");
}
if( i%5!=0 ) printf("\n");
}
if( !recursive ){
pgno = 0;
}else{
pgno = decodeInt32(&a[0]);
}
sqlite3_free(a);
}
}
/*
** A short text comment on the use of each page.
*/
static char **zPageUse;
/*
** Add a comment on the use of a page.
*/
static void page_usage_msg(u32 pgno, const char *zFormat, ...){
va_list ap;
char *zMsg;
va_start(ap, zFormat);
zMsg = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
if( pgno<=0 || pgno>g.mxPage ){
printf("ERROR: page %d out of range 1..%u: %s\n",
pgno, g.mxPage, zMsg);
sqlite3_free(zMsg);
return;
}
if( zPageUse[pgno]!=0 ){
printf("ERROR: page %d used multiple times:\n", pgno);
printf("ERROR: previous: %s\n", zPageUse[pgno]);
printf("ERROR: current: %s\n", zMsg);
sqlite3_free(zPageUse[pgno]);
}
zPageUse[pgno] = zMsg;
}
/*
** Find overflow pages of a cell and describe their usage.
*/
static void page_usage_cell(
unsigned char cType, /* Page type */
unsigned char *a, /* Cell content */
u32 pgno, /* page containing the cell */
int cellno /* Index of the cell on the page */
){
int i;
int n = 0;
i64 nPayload;
i64 rowid;
i64 nLocal;
i = 0;
if( cType<=5 ){
a += 4;
n += 4;
}
if( cType!=5 ){
i = decodeVarint(a, &nPayload);
a += i;
n += i;
nLocal = localPayload(nPayload, cType);
}else{
nPayload = nLocal = 0;
}
if( cType==5 || cType==13 ){
i = decodeVarint(a, &rowid);
a += i;
n += i;
}
if( nLocal<nPayload ){
u32 ovfl = decodeInt32(a+nLocal);
u32 cnt = 0;
while( ovfl && (cnt++)<g.mxPage ){
page_usage_msg(ovfl, "overflow %d from cell %d of page %u",
cnt, cellno, pgno);
a = fileRead((ovfl-1)*(sqlite3_int64)g.pagesize, 4);
ovfl = decodeInt32(a);
sqlite3_free(a);
}
}
}
/*
** True if the memory is all zeros
*/
static int allZero(unsigned char *a, int n){
while( n && (a++)[0]==0 ){ n--; }
return n==0;
}
/*
** Describe the usages of a b-tree page.
**
** If parent==0, then this is the root of a btree. If parent<0 then
** this is an orphan page.
*/
static void page_usage_btree(
u32 pgno, /* Page to describe */
int parent, /* Parent of this page. 0 for root pages */
int idx, /* Which child of the parent */
const char *zName /* Name of the table */
){
unsigned char *a;
const char *zType = "corrupt node";
int nCell;
int i;
int hdr = pgno==1 ? 100 : 0;
char zEntry[30];
if( pgno<=0 || pgno>g.mxPage ) return;
a = fileRead((pgno-1)*g.pagesize, g.pagesize);
switch( a[hdr] ){
case 0: {
if( allZero(a, g.pagesize) ){
zType = "zeroed page";
}else if( parent<0 ){
return;
}else{
zType = "corrupt node";
}
break;
}
case 2: zType = "interior node of index"; break;
case 5: zType = "interior node of table"; break;
case 10: zType = "leaf of index"; break;
case 13: zType = "leaf of table"; break;
default: {
if( parent<0 ) return;
zType = "corrupt node";
}
}
nCell = a[hdr+3]*256 + a[hdr+4];
if( nCell==1 ){
sqlite3_snprintf(sizeof(zEntry),zEntry,"1 row");
}else{
sqlite3_snprintf(sizeof(zEntry),zEntry,"%d rows", nCell);
}
if( parent>0 ){
page_usage_msg(pgno, "%s [%s], child %d of page %d, %s",
zType, zName, idx, parent, zEntry);
}else if( parent==0 ){
page_usage_msg(pgno, "root %s [%s], %s", zType, zName, zEntry);
}else{
page_usage_msg(pgno, "orphaned %s, %s", zType, zEntry);
}
if( a[hdr]==2 || a[hdr]==5 ){
int cellstart = hdr+12;
u32 child;
for(i=0; i<nCell; i++){
u32 cellidx;
u32 ofst;
cellidx = cellstart + i*2;
if( cellidx+1 >= g.pagesize ){
printf("ERROR: page %d too many cells (%d)\n", pgno, nCell);
break;
}
ofst = a[cellidx]*256 + a[cellidx+1];
if( ofst<cellidx+2 || ofst+4>=g.pagesize ){
printf("ERROR: page %d cell %d out of bounds\n", pgno, i);
continue;
}
child = decodeInt32(a+ofst);
page_usage_btree(child, pgno, i, zName);
}
child = decodeInt32(a+cellstart-4);
page_usage_btree(child, pgno, i, zName);
}
if( a[hdr]==2 || a[hdr]==10 || a[hdr]==13 ){
int cellstart = hdr + 8 + 4*(a[hdr]<=5);
for(i=0; i<nCell; i++){
int ofst;
ofst = cellstart + i*2;
ofst = a[ofst]*256 + a[ofst+1];
page_usage_cell(a[hdr], a+ofst, pgno, i);
}
}
sqlite3_free(a);
}
/*
** Determine page usage by the freelist
*/
static void page_usage_freelist(u32 pgno){
unsigned char *a;
int cnt = 0;
int i;
int n;
int iNext;
int parent = 1;
while( pgno>0 && pgno<=g.mxPage && (u32)(cnt++)<g.mxPage ){
page_usage_msg(pgno, "freelist trunk #%d child of %d", cnt, parent);
a = fileRead((pgno-1)*g.pagesize, g.pagesize);
iNext = decodeInt32(a);
n = decodeInt32(a+4);
if( n>(g.pagesize - 8)/4 ){
printf("ERROR: page %d too many freelist entries (%d)\n", pgno, n);
n = (g.pagesize - 8)/4;
}
for(i=0; i<n; i++){
int child = decodeInt32(a + (i*4+8));
page_usage_msg(child, "freelist leaf, child %d of trunk page %d",
i, pgno);
}
sqlite3_free(a);
parent = pgno;
pgno = iNext;
}
}
/*
** Determine pages used as PTRMAP pages
*/
static void page_usage_ptrmap(u8 *a){
if( decodeInt32(a+52) ){
int usable = g.pagesize - a[20];
u64 pgno = 2;
int perPage = usable/5;
while( pgno<=g.mxPage ){
page_usage_msg((u32)pgno, "PTRMAP page covering %llu..%llu",
pgno+1, pgno+perPage);
pgno += perPage + 1;
}
}
}
/*
** Try to figure out how every page in the database file is being used.
*/
static void page_usage_report(const char *zPrg, const char *zDbName){
u32 i, j;
int rc;
sqlite3 *db;
sqlite3_stmt *pStmt;