SQLite

  int i;
  for(i=0; i<pHash->nSlot; i++){
    if( pHash->aSlot[i] ){
      sqlite3_free(pHash->aSlot[i]);
      pHash->aSlot[i] = 0;
    }
  }
  pHash->nEntry = 0;
}

static unsigned int fts5HashKey(int nSlot, const char *p, int n){
  int i;
  unsigned int h = 13;
  for(i=n-1; i>=0; i--){
    h = (h << 3) ^ h ^ p[i];
  }
  return (h % nSlot);
}

/*
** Resize the hash table by doubling the number of slots.
*/
static int fts5HashResize(Fts5Hash *pHash){
  int nNew = pHash->nSlot*2;
  int i;
  Fts5HashEntry **apNew;
  Fts5HashEntry **apOld = pHash->aSlot;

  apNew = (Fts5HashEntry**)sqlite3_malloc(nNew*sizeof(Fts5HashEntry*));
  if( !apNew ) return SQLITE_NOMEM;
  memset(apNew, 0, nNew*sizeof(Fts5HashEntry*));

  for(i=0; i<pHash->nSlot; i++){
    while( apOld[i] ){
      int iHash;
      Fts5HashEntry *p = apOld[i];
      apOld[i] = p->pNext;
      iHash = fts5HashKey(nNew, p->zKey, strlen(p->zKey));
      p->pNext = apNew[iHash];
      apNew[iHash] = p;
    }
  }

  sqlite3_free(apOld);
  pHash->nSlot = nNew;
  pHash->aSlot = apNew;
  return SQLITE_OK;
}

/*
** Store the 32-bit integer passed as the second argument in buffer p.
*/
static int fts5PutNativeInt(u8 *p, int i){
  assert( sizeof(i)==4 );

int sqlite3Fts5HashWrite(
  Fts5Hash *pHash,
  i64 iRowid,                     /* Rowid for this entry */
  int iCol,                       /* Column token appears in (-ve -> delete) */
  int iPos,                       /* Position of token within column */
  const char *pToken, int nToken  /* Token to add or remove to or from index */
){
  unsigned int iHash = fts5HashKey(pHash->nSlot, pToken, nToken);
  Fts5HashEntry *p;
  u8 *pPtr;
  int nIncr = 0;                  /* Amount to increment (*pHash->pnByte) by */

  /* Attempt to locate an existing hash object */
  for(p=pHash->aSlot[iHash]; p; p=p->pNext){
    if( memcmp(p->zKey, pToken, nToken)==0 && p->zKey[nToken]==0 ) break;
  }

  /* If an existing hash entry cannot be found, create a new one. */
  if( p==0 ){
    int nByte = sizeof(Fts5HashEntry) + nToken + 1 + 64;
    if( nByte<128 ) nByte = 128;

    if( (pHash->nEntry*2)>=pHash->nSlot ){
      int rc = fts5HashResize(pHash);
      if( rc!=SQLITE_OK ) return rc;
      iHash = fts5HashKey(pHash->nSlot, pToken, nToken);
    }

    p = (Fts5HashEntry*)sqlite3_malloc(nByte);
    if( !p ) return SQLITE_NOMEM;
    memset(p, 0, sizeof(Fts5HashEntry));
    p->nAlloc = nByte;
    memcpy(p->zKey, pToken, nToken);
    p->zKey[nToken] = '\0';
    p->iRowidOff = p->nData = nToken + 1 + sizeof(Fts5HashEntry);
    p->nData += sqlite3PutVarint(&((u8*)p)[p->nData], iRowid);
    p->iRowid = iRowid;
    p->pNext = pHash->aSlot[iHash];
    pHash->aSlot[iHash] = p;
    pHash->nEntry++;

    nIncr += p->nData;
  }

  /* Check there is enough space to append a new entry. Worst case scenario
  ** is:
  **

  }

  pList = 0;
  for(i=0; i<nMergeSlot; i++){
    pList = fts5HashEntryMerge(pList, ap[i]);
  }

  pHash->nEntry = 0;
  sqlite3_free(ap);
  *ppSorted = pList;
  return SQLITE_OK;
}

int sqlite3Fts5HashIterate(
  Fts5Hash *pHash,

}

/*
** Indicate that all subsequent calls to sqlite3Fts5IndexWrite() pertain
** to the document with rowid iRowid.
*/
void sqlite3Fts5IndexBeginWrite(Fts5Index *p, i64 iRowid){
  if( iRowid<=p->iWriteRowid || (p->nPendingData > p->nMaxPendingData) ){
    fts5IndexFlush(p);
  }
  p->iWriteRowid = iRowid;
}

/*
** Commit data to disk.