Index: tool/showjournal.c ================================================================== --- tool/showjournal.c +++ tool/showjournal.c @@ -1,76 +1,139 @@ /* ** A utility for printing an SQLite database journal. */ #include #include -#include -#include -#include -#include #include - +#include -static int pagesize = 1024; -static int db = -1; -static int mxPage = 0; +/* +** state information +*/ +static int pageSize = 1024; +static int sectorSize = 512; +static FILE *db = 0; +static int showPageContent = 0; +static int fileSize = 0; +static unsigned cksumNonce = 0; +/* Report a memory allocation error */ static void out_of_memory(void){ fprintf(stderr,"Out of memory...\n"); exit(1); } -static print_page(int iPg){ - unsigned char *aData; +/* +** Read N bytes of memory starting at iOfst into space obtained +** from malloc(). +*/ +static char *read_content(int N, int iOfst){ + int got; + char *pBuf = malloc(N); + if( pBuf==0 ) out_of_memory(); + fseek(db, iOfst, SEEK_SET); + got = fread(pBuf, 1, N, db); + if( got<0 ){ + fprintf(stderr, "I/O error reading %d bytes from %d\n", N, iOfst); + memset(pBuf, 0, N); + }else if( got=nByte ){ + sprintf(&zBuf[i], " "); + }else{ + sprintf(&zBuf[i], " %02x", aData[ofst+j]); + val = val*256 + aData[ofst+j]; + } + i += strlen(&zBuf[i]); + } + sprintf(&zBuf[i], " %10u", val); + printf("%s %s\n", zBuf, zMsg); + return val; +} + +/* +** Read and print a journal header. Store key information (page size, etc) +** in global variables. +*/ +static unsigned decode_journal_header(int iOfst){ + char *pHdr = read_content(64, iOfst); + unsigned nPage; + printf("Header at offset %d:\n", iOfst); + print_decode_line(pHdr, 0, 4, "Header part 1 (3654616569)"); + print_decode_line(pHdr, 4, 4, "Header part 2 (547447767)"); + nPage = + print_decode_line(pHdr, 8, 4, "page count"); + cksumNonce = + print_decode_line(pHdr, 12, 4, "chksum nonce"); + print_decode_line(pHdr, 16, 4, "initial database size in pages"); + sectorSize = + print_decode_line(pHdr, 20, 4, "sector size"); + pageSize = + print_decode_line(pHdr, 24, 4, "page size"); + print_decode_line(pHdr, 28, 4, "zero"); + print_decode_line(pHdr, 32, 4, "zero"); + print_decode_line(pHdr, 36, 4, "zero"); + print_decode_line(pHdr, 40, 4, "zero"); + free(pHdr); + return nPage; +} + +static void print_page(int iOfst){ + unsigned char *aData; + char zTitle[50]; + aData = read_content(pageSize+8, iOfst); + sprintf(zTitle, "page number for page at offset %d", iOfst); + print_decode_line(aData, 0, 4, zTitle); free(aData); } int main(int argc, char **argv){ - struct stat sbuf; - unsigned int u; int rc; - unsigned char zBuf[10]; - unsigned char zBuf2[sizeof(u)]; + int nPage, cnt; + int iOfst; if( argc!=2 ){ fprintf(stderr,"Usage: %s FILENAME\n", argv[0]); exit(1); } - db = open(argv[1], O_RDONLY); - if( db<0 ){ + db = fopen(argv[1], "rb"); + if( db==0 ){ fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]); exit(1); } - read(db, zBuf, 8); - if( zBuf[7]==0xd6 ){ - read(db, &u, sizeof(u)); - printf("Records in Journal: %u\n", u); - read(db, &u, sizeof(u)); - printf("Magic Number: 0x%08x\n", u); - } - read(db, zBuf2, sizeof(zBuf2)); - u = zBuf2[0]<<24 | zBuf2[1]<<16 | zBuf2[2]<<8 | zBuf2[3]; - printf("Database Size: %u\n", u); - while( read(db, zBuf2, sizeof(zBuf2))==sizeof(zBuf2) ){ - u = zBuf2[0]<<24 | zBuf2[1]<<16 | zBuf2[2]<<8 | zBuf2[3]; - print_page(u); - if( zBuf[7]==0xd6 ){ - read(db, &u, sizeof(u)); - printf("Checksum: 0x%08x\n", u); - } - } - close(db); + fseek(db, 0, SEEK_END); + fileSize = ftell(db); + printf("journal file size: %d bytes\n", fileSize); + fseek(db, 0, SEEK_SET); + iOfst = 0; + while( iOfst