void IterateHandler(ref SpanReader reader, IFieldHandler handler, bool skipping, HashSet <int>?knownInlineRefs)
{
if (handler is ODBDictionaryFieldHandler)
{
var dictId = reader.ReadVUInt64();
if (!skipping)
{
var kvHandlers = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().ToArray();
IterateDict(dictId, kvHandlers[0], kvHandlers[1]);
}
}
else if (handler is ODBSetFieldHandler)
{
var dictId = reader.ReadVUInt64();
if (!skipping)
{
var keyHandler = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().First();
IterateSet(dictId, keyHandler);
}
}
else if (handler is DBObjectFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
if (knownInlineRefs != null)
{
if (knownInlineRefs.Contains((int)oid))
{
if (!skipping)
{
_visitor?.InlineBackRef((int)oid);
}
return;
}
if (!skipping)
{
_visitor?.InlineRef((int)oid);
}
knownInlineRefs.Add((int)oid);
}
var tableId = reader.ReadVUInt32();
var version = reader.ReadVUInt32();
if (!skipping)
{
MarkTableIdVersionFieldInfo(tableId, version);
}
var skip = skipping ||
_visitor != null && !_visitor.StartInlineObject(tableId,
_tableId2Name.TryGetValue(tableId, out var tableName) ? tableName : null, version);
var tvi = GetTableVersionInfo(tableId, version);
var knownInlineRefsNested = new HashSet <int>();
for (var i = 0; i < tvi.FieldCount; i++)
{
var fi = tvi[i];
var skipField = skip || _visitor != null && !_visitor.StartField(fi.Name);
IterateHandler(ref reader, fi.Handler !, skipField, knownInlineRefsNested);
if (!skipField)
{
_visitor?.EndField();
}
}
if (!skip)
{
_visitor?.EndInlineObject();
}
}
}
else if (handler is ListFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
var itemHandler = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().First();
IterateInlineList(ref reader, itemHandler, skipping, knownInlineRefs);
}
}
else if (handler is DictionaryFieldHandler)
{
var oid = reader.ReadVInt64();
if (oid == 0)
{
if (!skipping)
{
_visitor?.OidReference(0);
}
}
else if (oid <= int.MinValue || oid > 0)
{
if (!skipping)
{
_visitor?.OidReference((ulong)oid);
IterateOid((ulong)oid);
}
}
else
{
var kvHandlers = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().ToArray();
IterateInlineDict(ref reader, kvHandlers[0], kvHandlers[1], skipping, knownInlineRefs);
}
}
else if (handler is NullableFieldHandler)
{
var hasValue = reader.ReadBool();
if (hasValue)
{
var itemHandler = ((IFieldHandlerWithNestedFieldHandlers)handler).EnumerateNestedFieldHandlers().First();
IterateHandler(ref reader, itemHandler, skipping, null);
}
}
else if (handler is OrderedEncryptedStringHandler)
{
var cipher = _tr.Owner.GetSymmetricCipher();
if (cipher is InvalidSymmetricCipher)
{
var length = reader.ReadVUInt32();
_visitor?.ScalarAsText($"Encrypted[{length}]");
if (length > 0)
{
reader.SkipBlock(length - 1);
}
}
else
{
var enc = reader.ReadByteArray();
var size = cipher.CalcOrderedPlainSizeFor(enc);
var dec = new byte[size];
if (!cipher.OrderedDecrypt(enc, dec))
{
_visitor?.ScalarAsText($"Encrypted[{enc!.Length}] failed to decrypt");
}
var r = new SpanReader(dec);
_visitor?.ScalarAsText(r.ReadString() !);
}
}
else if (handler is EncryptedStringHandler)
{
var cipher = _tr.Owner.GetSymmetricCipher();
if (cipher is InvalidSymmetricCipher)
{
var length = reader.ReadVUInt32();
_visitor?.ScalarAsText($"Encrypted[{length}]");
if (length > 0)
{
reader.SkipBlock(length - 1);
}
}
else
{
var enc = reader.ReadByteArray();
var size = cipher.CalcPlainSizeFor(enc);
var dec = new byte[size];
if (!cipher.Decrypt(enc, dec))
{
_visitor?.ScalarAsText($"Encrypted[{enc!.Length}] failed to decrypt");
}
var r = new SpanReader(dec);
_visitor?.ScalarAsText(r.ReadString() !);
}
}
else if (handler.NeedsCtx() || handler.HandledType() == null)
{
throw new BTDBException("Don't know how to iterate " + handler.Name);
}
else
{
if (skipping || _visitor == null)
{
if (!_skippers.TryGetValue(handler, out var skipper))
{
var meth =
ILBuilder.Instance.NewMethod <SkipperFun>("Skip" + handler.Name);
var il = meth.Generator;
handler.Skip(il, il2 => il2.Ldarg(0), null);
il.Ret();
skipper = meth.Create();
_skippers.Add(handler, skipper);
}
skipper(ref reader);
}
else
{
if (!_loaders.TryGetValue(handler, out var loader))
{
var meth =
ILBuilder.Instance.NewMethod <LoaderFun>("Load" + handler.Name);
var il = meth.Generator;
handler.Load(il, il2 => il2.Ldarg(0), null);
il.Box(handler.HandledType() !).Ret();
loader = meth.Create();
_loaders.Add(handler, loader);
}
var obj = loader(ref reader);
if (_visitor.NeedScalarAsObject())
{
_visitor.ScalarAsObject(obj);
}
if (_visitor.NeedScalarAsText())
{
_visitor.ScalarAsText(obj == null
? "null"
: string.Format(CultureInfo.InvariantCulture, "{0}", obj));
}
}
}
}