int ISQLite3Provider.sqlite3_create_function(IntPtr db, string name, int nargs, object v, delegate_function_aggregate_step func_step, delegate_function_aggregate_final func_final)
{
string key = string.Format("{0}.{1}", nargs, name);
if (_agg_functions.ContainsKey(key))
{
agg_function_hook_info hi = _agg_functions[key];
// TODO maybe turn off the hook here, for now
hi.free();
_agg_functions.Remove(key);
}
GCHandle pinned = GCHandle.Alloc(util.to_utf8(name), GCHandleType.Pinned);
IntPtr ptr = pinned.AddrOfPinnedObject();
int rc;
// 1 is SQLITE_UTF8
if (func_step != null)
{
// TODO both func_step and func_final must be non-null
agg_function_hook_info hi = new agg_function_hook_info(func_step, func_final, v);
rc = SQLite3RuntimeProvider.sqlite3_create_function_v2(db.ToInt64(), ptr.ToInt64(), nargs, 1, hi.ptr.ToInt64(), 0, Marshal.GetFunctionPointerForDelegate(new callback_agg_function_step(agg_function_hook_bridge_step)).ToInt64(), Marshal.GetFunctionPointerForDelegate(new callback_agg_function_final(agg_function_hook_bridge_final)).ToInt64(), 0);
if (rc == 0)
{
_agg_functions[key] = hi;
}
}
else
{
rc = SQLite3RuntimeProvider.sqlite3_create_function_v2(db.ToInt64(), ptr.ToInt64(), nargs, 1, 0, 0, 0, 0, 0);
}
pinned.Free();
return(rc);
}