static int fts3IntegrityCheck(Fts3Table *p, int *pbOk){
  int rc = SQLITE_OK;             /* Return code */
  u64 cksum1 = 0;                 /* Checksum based on FTS index contents */
  u64 cksum2 = 0;                 /* Checksum based on %_content contents */
  sqlite3_stmt *pAllLangid = 0;   /* Statement to return all language-ids */

  /* This block calculates the checksum according to the FTS index. */
  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
    while( rc==SQLITE_OK && sqlite3_step(pAllLangid)==SQLITE_ROW ){
      int iLangid = sqlite3_column_int(pAllLangid, 0);
      int i;
      for(i=0; i<p->nIndex; i++){
        cksum1 = cksum1 ^ fts3ChecksumIndex(p, iLangid, i, &rc);
      }
    }
    rc2 = sqlite3_reset(pAllLangid);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  /* This block calculates the checksum according to the %_content table */
  if( rc==SQLITE_OK ){
    sqlite3_tokenizer_module const *pModule = p->pTokenizer->pModule;
    sqlite3_stmt *pStmt = 0;
    char *zSql;
   
    zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
    if( !zSql ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
      sqlite3_free(zSql);
    }

    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
      i64 iDocid = sqlite3_column_int64(pStmt, 0);
      int iLang = langidFromSelect(p, pStmt);
      int iCol;

      for(iCol=0; rc==SQLITE_OK && iCol<p->nColumn; iCol++){
        if( p->abNotindexed[iCol]==0 ){
          const char *zText = (const char *)sqlite3_column_text(pStmt, iCol+1);
          sqlite3_tokenizer_cursor *pT = 0;

          rc = sqlite3Fts3OpenTokenizer(p->pTokenizer, iLang, zText, -1, &pT);
          while( rc==SQLITE_OK ){
            char const *zToken;       /* Buffer containing token */
            int nToken = 0;           /* Number of bytes in token */
            int iDum1 = 0, iDum2 = 0; /* Dummy variables */
            int iPos = 0;             /* Position of token in zText */

            rc = pModule->xNext(pT, &zToken, &nToken, &iDum1, &iDum2, &iPos);
            if( rc==SQLITE_OK ){
              int i;
              cksum2 = cksum2 ^ fts3ChecksumEntry(
                  zToken, nToken, iLang, 0, iDocid, iCol, iPos
              );
              for(i=1; i<p->nIndex; i++){
                if( p->aIndex[i].nPrefix<=nToken ){
                  cksum2 = cksum2 ^ fts3ChecksumEntry(
                      zToken, p->aIndex[i].nPrefix, iLang, i, iDocid, iCol, iPos
                  );
                }
              }
            }
          }
          if( pT ) pModule->xClose(pT);
          if( rc==SQLITE_DONE ) rc = SQLITE_OK;
        }
      }
    }

    sqlite3_finalize(pStmt);
  }

  *pbOk = (cksum1==cksum2);
  return rc;
}
static int fts3IntegrityCheck(Fts3Table *p, int *pbOk){
  int rc = SQLITE_OK;              
  u64 cksum1 = 0;                  
  u64 cksum2 = 0;                  
  sqlite3_stmt *pAllLangid = 0;    

   
  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
    while( rc==SQLITE_OK && sqlite3_step(pAllLangid)==SQLITE_ROW ){
      int iLangid = sqlite3_column_int(pAllLangid, 0);
      int i;
      for(i=0; i<p->nIndex; i++){
        cksum1 = cksum1 ^ fts3ChecksumIndex(p, iLangid, i, &rc);
      }
    }
    rc2 = sqlite3_reset(pAllLangid);
    if( rc==SQLITE_OK ) rc = rc2;
  }

   
  if( rc==SQLITE_OK ){
    sqlite3_tokenizer_module const *pModule = p->pTokenizer->pModule;
    sqlite3_stmt *pStmt = 0;
    char *zSql;
   
    zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
    if( !zSql ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
      sqlite3_free(zSql);
    }

    while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
      i64 iDocid = sqlite3_column_int64(pStmt, 0);
      int iLang = langidFromSelect(p, pStmt);
      int iCol;

      for(iCol=0; rc==SQLITE_OK && iCol<p->nColumn; iCol++){
        if( p->abNotindexed[iCol]==0 ){
          const char *zText = (const char *)sqlite3_column_text(pStmt, iCol+1);
          sqlite3_tokenizer_cursor *pT = 0;

          rc = sqlite3Fts3OpenTokenizer(p->pTokenizer, iLang, zText, -1, &pT);
          while( rc==SQLITE_OK ){
            char const *zToken;        
            int nToken = 0;            
            int iDum1 = 0, iDum2 = 0;  
            int iPos = 0;              

            rc = pModule->xNext(pT, &zToken, &nToken, &iDum1, &iDum2, &iPos);
            if( rc==SQLITE_OK ){
              int i;
              cksum2 = cksum2 ^ fts3ChecksumEntry(
                  zToken, nToken, iLang, 0, iDocid, iCol, iPos
              );
              for(i=1; i<p->nIndex; i++){
                if( p->aIndex[i].nPrefix<=nToken ){
                  cksum2 = cksum2 ^ fts3ChecksumEntry(
                      zToken, p->aIndex[i].nPrefix, iLang, i, iDocid, iCol, iPos
                  );
                }
              }
            }
          }
          if( pT ) pModule->xClose(pT);
          if( rc==SQLITE_DONE ) rc = SQLITE_OK;
        }
      }
    }

    sqlite3_finalize(pStmt);
  }

  *pbOk = (cksum1==cksum2);
  return rc;
}