2 ** A utility for printing an SQLite database journal.
12 static int pageSize = 1024;
13 static int sectorSize = 512;
15 static int showPageContent = 0;
16 static int fileSize = 0;
17 static unsigned cksumNonce = 0;
19 /* Report a memory allocation error */
20 static void out_of_memory(void){
21 fprintf(stderr,"Out of memory...\n");
26 ** Read N bytes of memory starting at iOfst into space obtained
29 static char *read_content(int N, int iOfst){
31 char *pBuf = malloc(N);
32 if( pBuf==0 ) out_of_memory();
33 fseek(db, iOfst, SEEK_SET);
34 got = fread(pBuf, 1, N, db);
36 fprintf(stderr, "I/O error reading %d bytes from %d\n", N, iOfst);
39 fprintf(stderr, "Short read: got only %d of %d bytes from %d\n",
41 memset(&pBuf[got], 0, N-got);
46 /* Print a line of decode output showing a 4-byte integer.
48 static unsigned print_decode_line(
49 unsigned char *aData, /* Content being decoded */
50 int ofst, int nByte, /* Start and size of decode */
51 const char *zMsg /* Message to append */
54 unsigned val = aData[ofst];
56 sprintf(zBuf, " %03x: %02x", ofst, aData[ofst]);
60 sprintf(&zBuf[i], " ");
62 sprintf(&zBuf[i], " %02x", aData[ofst+j]);
63 val = val*256 + aData[ofst+j];
65 i += strlen(&zBuf[i]);
67 sprintf(&zBuf[i], " %10u", val);
68 printf("%s %s\n", zBuf, zMsg);
73 ** Read and print a journal header. Store key information (page size, etc)
74 ** in global variables.
76 static unsigned decode_journal_header(int iOfst){
77 char *pHdr = read_content(64, iOfst);
79 printf("Header at offset %d:\n", iOfst);
80 print_decode_line(pHdr, 0, 4, "Header part 1 (3654616569)");
81 print_decode_line(pHdr, 4, 4, "Header part 2 (547447767)");
83 print_decode_line(pHdr, 8, 4, "page count");
85 print_decode_line(pHdr, 12, 4, "chksum nonce");
86 print_decode_line(pHdr, 16, 4, "initial database size in pages");
88 print_decode_line(pHdr, 20, 4, "sector size");
90 print_decode_line(pHdr, 24, 4, "page size");
91 print_decode_line(pHdr, 28, 4, "zero");
92 print_decode_line(pHdr, 32, 4, "zero");
93 print_decode_line(pHdr, 36, 4, "zero");
94 print_decode_line(pHdr, 40, 4, "zero");
99 static void print_page(int iOfst){
100 unsigned char *aData;
102 aData = read_content(pageSize+8, iOfst);
103 sprintf(zTitle, "page number for page at offset %d", iOfst);
104 print_decode_line(aData, 0, 4, zTitle);
108 int main(int argc, char **argv){
113 fprintf(stderr,"Usage: %s FILENAME\n", argv[0]);
116 db = fopen(argv[1], "rb");
118 fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]);
121 fseek(db, 0, SEEK_END);
122 fileSize = ftell(db);
123 printf("journal file size: %d bytes\n", fileSize);
124 fseek(db, 0, SEEK_SET);
126 while( iOfst<fileSize ){
127 cnt = nPage = (int)decode_journal_header(iOfst);
129 cnt = (fileSize - sectorSize)/(pageSize+8);
132 while( cnt && iOfst<fileSize ){
136 iOfst = (iOfst/sectorSize + 1)*sectorSize;