}

    if( rc!=SQLITE_OK || iNextPtr==0 ) return rc;
    iPtr = iNextPtr;
  }

  assert( 0 );

}

/*
** Append a term and (optionally) doclist to the FTS segment node currently
** stored in blob *pNode. The node need not contain any terms, but the
** header must be written before this function is called.
**
................................................................................
  return rc;
}

/*
** Return a 64-bit checksum for the FTS index entry specified by the
** arguments to this function.
*/
static i64 fts3ChecksumEntry(
  const char *zTerm,              /* Pointer to buffer containing term */
  int nTerm,                      /* Size of zTerm in bytes */
  int iLangid,                    /* Language id for current row */
  int iIndex,                     /* Index (0..Fts3Table.nIndex-1) */
  i64 iDocid,                     /* Docid for current row. */
  int iCol,                       /* Column number */
  int iPos                        /* Position */
){
  int i;
  i64 ret = iDocid;

  ret += (ret<<3) + iLangid;
  ret += (ret<<3) + iIndex;
  ret += (ret<<3) + iCol;
  ret += (ret<<3) + iPos;
  for(i=0; i<nTerm; i++) ret += (ret<<3) + zTerm[i];

................................................................................
** language id iLangid. The checksum is calculated by XORing the checksums
** of each individual entry (see fts3ChecksumEntry()) together.
**
** If successful, the checksum value is returned and *pRc set to SQLITE_OK.
** Otherwise, if an error occurs, *pRc is set to an SQLite error code. The
** return value is undefined in this case.
*/
static i64 fts3ChecksumIndex(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,                    /* Language id to return cksum for */
  int iIndex,                     /* Index to cksum (0..p->nIndex-1) */
  int *pRc                        /* OUT: Return code */
){
  Fts3SegFilter filter;
  Fts3MultiSegReader csr;
  int rc;
  i64 cksum = 0;

  assert( *pRc==SQLITE_OK );

  memset(&filter, 0, sizeof(filter));
  memset(&csr, 0, sizeof(csr));
  filter.flags =  FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
  filter.flags |= FTS3_SEGMENT_SCAN;
................................................................................
** to false before returning.
**
** If an error occurs (e.g. an OOM or IO error), return an SQLite error 
** code. The final value of *pbOk is undefined in this case.
*/
static int fts3IntegrityCheck(Fts3Table *p, int *pbOk){
  int rc = SQLITE_OK;             /* Return code */
  i64 cksum1 = 0;                 /* Checksum based on FTS index contents */
  i64 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->nIndex);

    }

    if( rc!=SQLITE_OK || iNextPtr==0 ) return rc;
    iPtr = iNextPtr;
  }

  assert( 0 );
  return 0;
}

/*
** Append a term and (optionally) doclist to the FTS segment node currently
** stored in blob *pNode. The node need not contain any terms, but the
** header must be written before this function is called.
**
................................................................................
  return rc;
}

/*
** Return a 64-bit checksum for the FTS index entry specified by the
** arguments to this function.
*/
static u64 fts3ChecksumEntry(
  const char *zTerm,              /* Pointer to buffer containing term */
  int nTerm,                      /* Size of zTerm in bytes */
  int iLangid,                    /* Language id for current row */
  int iIndex,                     /* Index (0..Fts3Table.nIndex-1) */
  i64 iDocid,                     /* Docid for current row. */
  int iCol,                       /* Column number */
  int iPos                        /* Position */
){
  int i;
  u64 ret = (u64)iDocid;

  ret += (ret<<3) + iLangid;
  ret += (ret<<3) + iIndex;
  ret += (ret<<3) + iCol;
  ret += (ret<<3) + iPos;
  for(i=0; i<nTerm; i++) ret += (ret<<3) + zTerm[i];

................................................................................
** language id iLangid. The checksum is calculated by XORing the checksums
** of each individual entry (see fts3ChecksumEntry()) together.
**
** If successful, the checksum value is returned and *pRc set to SQLITE_OK.
** Otherwise, if an error occurs, *pRc is set to an SQLite error code. The
** return value is undefined in this case.
*/
static u64 fts3ChecksumIndex(
  Fts3Table *p,                   /* FTS3 table handle */
  int iLangid,                    /* Language id to return cksum for */
  int iIndex,                     /* Index to cksum (0..p->nIndex-1) */
  int *pRc                        /* OUT: Return code */
){
  Fts3SegFilter filter;
  Fts3MultiSegReader csr;
  int rc;
  u64 cksum = 0;

  assert( *pRc==SQLITE_OK );

  memset(&filter, 0, sizeof(filter));
  memset(&csr, 0, sizeof(csr));
  filter.flags =  FTS3_SEGMENT_REQUIRE_POS|FTS3_SEGMENT_IGNORE_EMPTY;
  filter.flags |= FTS3_SEGMENT_SCAN;
................................................................................
** to false before returning.
**
** If an error occurs (e.g. an OOM or IO error), return an SQLite error 
** code. The final value of *pbOk is undefined in this case.
*/
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->nIndex);