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Overview
Comment:In the showdb.exe utility, for the "NNNbd" command, also show data fields in addition to header fields on each record decoded. Improvements to formatting.
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SHA1: b451fe0cb92278deb7724e7995c1bd46ae83c119
User & Date: drh 2014-06-20 01:32:42
Context
2014-06-20
13:55
Improved display of record data in the "NNNbd" output of the showdb.exe utility program. check-in: f735c249 user: drh tags: trunk
01:32
In the showdb.exe utility, for the "NNNbd" command, also show data fields in addition to header fields on each record decoded. Improvements to formatting. check-in: b451fe0c user: drh tags: trunk
2014-06-19
23:38
Add the ability to decode the headers of individual cells, byte-by-byte, in the "showdb.exe" utility. check-in: 306b461d user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to tool/showdb.c.

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  i64 rowid;
  i64 nHdr;
  i64 iType;
  int nLocal;
  unsigned char *x = a + ofst;
  unsigned char *end;
  unsigned char cType = a[0];





  printf("Decode cell[%d] on page %d offset %04x....\n",
         iCell, pgno, szPgHdr+ofst);

  if( cType<=5 ){
    leftChild = ((x[0]*256 + x[1])*256 + x[2])*256 + x[3];
    printBytes(a, x, 4);
    printf("left child page:: %d\n", leftChild);
    x += 4;
  }
  if( cType!=5 ){
    i = decodeVarint(x, &nPayload);
    printBytes(a, x, i);
    nLocal = localPayload(nPayload, cType);




    printf("bytes of payload: %d  (local: %d)\n", (int)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;
    k = 0;

    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("column[%d] type code: %d - ", k++, (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;
................................................................................
           sz = (int)(iType-12)/2;
           sprintf(zNm, (iType&1)==0 ? "blob(%d)" : "text(%d)", sz);
           zTypeName = zNm;
           break;
         }
       }
       printf("%s\n", zTypeName);





       j += i;


























    }
  }
  if( j<nLocal ){
    printBytes(a, x+j, 0);
    printf("%d bytes of content\n", nLocal-j);
  }
  if( nLocal<nPayload ){
    printBytes(a, x+nLocal, 4);
    printf("first overflow page: %d\n", decodeInt32(x+nLocal));
  }
}


/*
** Decode a btree page
*/
................................................................................
        break;
      }
    }
    zArgs++;
  }
  nCell = a[3]*256 + a[4];
  iCellPtr = (a[0]==2 || a[0]==5) ? 12 : 8;
  if( cellToDecode==(-2) ){



    printf("Decode of 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( nCell>0 ){
      printf(" key: lx=left-child n=payload-size r=rowid\n");
    }
  }else if( cellToDecode>=nCell ){
    printf("Page %d has only %d cells\n", pgno, nCell);
    return;
  }
  if( showMap ){
    zMap = malloc(pagesize);
    memset(zMap, '.', pagesize);
    memset(zMap, '1', hdrSize);
    memset(&zMap[hdrSize], 'H', iCellPtr);
    memset(&zMap[hdrSize+iCellPtr], 'P', 2*nCell);
  }
................................................................................
    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 ){

    for(i=0; i<pagesize; i+=64){
      printf(" %03x: %.64s\n", i, &zMap[i]);
    }
    free(zMap);
  }
}








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  i64 rowid;
  i64 nHdr;
  i64 iType;
  int 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:: %d\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: %d\n", (int)nPayload);
    }else{
      printf("payload-size: %d (%d local, %d overflow)\n",
             (int)nPayload, nLocal, (int)(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;
................................................................................
           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] = 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{
         printf("%d bytes of %s\n", szCol[i],
                (typeCol[i]&1)==0 ? "BLOB" : "TEXT");
       }
       j = ofstCol[i] + szCol[i];
    }
  }
  if( j<nLocal ){
    printBytes(a, x+j, 0);
    printf("... %d bytes of content ...\n", nLocal-j);
  }
  if( nLocal<nPayload ){
    printBytes(a, x+nLocal, 4);
    printf("overflow-page: %d\n", decodeInt32(x+nLocal));
  }
}


/*
** Decode a btree page
*/
................................................................................
        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 = malloc(pagesize);
    memset(zMap, '.', pagesize);
    memset(zMap, '1', hdrSize);
    memset(&zMap[hdrSize], 'H', iCellPtr);
    memset(&zMap[hdrSize+iCellPtr], 'P', 2*nCell);
  }
................................................................................
    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; i<pagesize; i+=64){
      printf(" %03x: %.64s\n", i, &zMap[i]);
    }
    free(zMap);
  }
}