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Overview
Comment: | Enhancements to the showdb.c utility program. Automatically detect the page size and adjust the display accordingly. Add the "dbheader" display option. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
23eb408b5d08b89b41aaf245a7be8e23 |
User & Date: | drh 2010-04-26 15:44:07.000 |
Context
2010-04-26
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16:47 | Further enhancements to the showdb utility: A page number followed by "b" causes a btree decoding to occur on the page. (check-in: 2ff824e58c user: drh tags: trunk) | |
15:44 | Enhancements to the showdb.c utility program. Automatically detect the page size and adjust the display accordingly. Add the "dbheader" display option. (check-in: 23eb408b5d user: drh tags: trunk) | |
2010-04-25
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20:58 | Remove an unreachable branch from the function initialization logic. (check-in: 064d3ddd61 user: drh tags: trunk) | |
Changes
Changes to tool/showdb.c.
1 2 3 4 5 6 7 8 9 10 11 12 | /* ** A utility for printing all or part of an SQLite database file. */ #include <stdio.h> #include <ctype.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> | > | | | | > > > > > > > > > > > > > > > > > > > > > > > > > > > | < | | | > > | > > > > > > > > > > > > > > > > > > > > > > > > > | | > > > | | > > > > | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | > > > > > > > > > | 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 | /* ** A utility for printing all or part of an SQLite database file. */ #include <stdio.h> #include <ctype.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <string.h> static int pagesize = 1024; /* Size of a database page */ static int db = -1; /* File descriptor for reading the DB */ static int mxPage = 0; /* Last page number */ static int perLine = 16; /* HEX elements to print per line */ typedef long long int i64; /* Datatype for 64-bit integers */ /* ** 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 char *z, i64 *pVal){ i64 v = 0; int i = 0; while( i<8 ){ 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; } /* Report an out-of-memory error and die. */ static void out_of_memory(void){ fprintf(stderr,"Out of memory...\n"); exit(1); } /* ** Read content from the file. ** ** Space to hold the content is obtained from malloc() and needs to be ** freed by the caller. */ static unsigned char *getContent(int ofst, int nByte){ unsigned char *aData; aData = malloc(nByte); if( aData==0 ) out_of_memory(); lseek(db, ofst, SEEK_SET); read(db, aData, nByte); return aData; } /* ** Print a range of bytes as hex and as ascii. */ static unsigned char *print_byte_range( int 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 = getContent(ofst, nByte); for(i=0; i<nByte; i += perLine){ fprintf(stdout, zOfstFmt, i+printOfst); for(j=0; j<perLine; j++){ if( i+j>nByte ){ fprintf(stdout, " "); }else{ fprintf(stdout,"%02x ", aData[i+j]); } } for(j=0; j<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 print_page(int iPg){ int iStart; unsigned char *aData; iStart = (iPg-1)*pagesize; fprintf(stdout, "Page %d: (offsets 0x%x..0x%x)\n", iPg, iStart, iStart+pagesize-1); aData = print_byte_range(iStart, pagesize, 0); free(aData); } /* Print a line of decode output showing a 4-byte integer. */ static 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; int val = aData[ofst]; char zBuf[100]; sprintf(zBuf, " %03x: %02x", ofst, aData[ofst]); i = 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 += strlen(&zBuf[i]); } sprintf(&zBuf[i], " %9d", val); printf(" %s %s\n", zBuf, zMsg); } /* ** Decode the database header. */ static 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, "meta[7]"); 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, "meta[13]"); print_decode_line(aData, 96, 4, "meta[14]"); } int main(int argc, char **argv){ struct stat sbuf; unsigned char zPgSz[2]; if( argc<2 ){ fprintf(stderr,"Usage: %s FILENAME ?PAGE? ...\n", argv[0]); exit(1); } db = open(argv[1], O_RDONLY); if( db<0 ){ fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]); exit(1); } zPgSz[0] = 0; zPgSz[1] = 0; lseek(db, 16, SEEK_SET); read(db, zPgSz, 2); pagesize = zPgSz[0]*256 + zPgSz[1]; if( pagesize==0 ) pagesize = 1024; printf("Pagesize: %d\n", pagesize); fstat(db, &sbuf); mxPage = sbuf.st_size/pagesize; printf("Available pages: 1..%d\n", mxPage); if( argc==2 ){ int i; for(i=1; i<=mxPage; i++) print_page(i); }else{ int i; for(i=2; i<argc; i++){ int iStart, iEnd; char *zLeft; if( strcmp(argv[i], "dbheader")==0 ){ print_db_header(); continue; } if( !isdigit(argv[i][0]) ){ fprintf(stderr, "%s: unknown option: [%s]\n", argv[0], argv[i]); continue; } iStart = strtol(argv[i], &zLeft, 0); if( zLeft && strcmp(zLeft,"..end")==0 ){ iEnd = mxPage; }else if( zLeft && zLeft[0]=='.' && zLeft[1]=='.' ){ iEnd = strtol(&zLeft[2], 0, 0); }else{ iEnd = iStart; |
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