public object Read(object value, ProtoReader source)
{
var type = ExpectedType;
if (source.WireType == WireType.Null)
{
return(Helpers.IsValueType(type) ? Activator.CreateInstance(type) : null);
}
if (!RequiresOldValue)
{
value = null;
}
bool shouldEnd;
int newTypeRefKey;
int newObjectKey;
int typeKey = _baseKey;
bool isDynamic;
bool isLateReference;
BclHelpers.NetObjectOptions options = _options;
SubItemToken token = NetObjectHelpers.ReadNetObject_Start(
ref value,
source,
ref type,
options,
out isDynamic,
out isLateReference,
ref typeKey,
out newObjectKey,
out newTypeRefKey,
out shouldEnd);
if (shouldEnd)
{
object oldValue = value;
if (typeKey >= 0)
{
// can be only for builtins
options &= ~BclHelpers.NetObjectOptions.LateSet;
if (typeKey == _baseKey && _baseKeySerializer != null)
{
if (isLateReference)
{
if (_lateReferenceTail == null)
{
throw new ProtoException("Late reference can't be deserialized for type " + ExpectedType.Name);
}
value = _lateReferenceTail.Read(value, source);
}
else
{
value = _baseKeySerializer.Read(value, source);
}
}
else
{
Debug.Assert(isDynamic);
value = ProtoReader.ReadObject(value, typeKey, source);
}
}
else
{
if (isDynamic)
{
if (source.TryReadBuiltinType(ref value, Helpers.GetTypeCode(type), true))
{
options |= BclHelpers.NetObjectOptions.LateSet;
}
else
{
throw new ProtoException("Dynamic type is not a contract-type: " + type.Name);
}
}
else
{
if (isLateReference)
{
if (_lateReferenceTail == null)
{
throw new ProtoException("Late reference can't be deserialized for type " + ExpectedType.Name);
}
value = _lateReferenceTail.Read(value, source);
}
else
{
if (_tail == null)
{
throw new ProtoException("Dynamic type expected but no type info was read");
}
else
{
// ensure consistent behavior with emit version
value = _tail.Read(_tail.RequiresOldValue ? value : null, source);
}
}
}
}
NetObjectHelpers.ReadNetObject_EndWithNoteNewObject(value, source, oldValue, type, newObjectKey, newTypeRefKey, options, token);
}
else
{
if (Helpers.IsValueType(ExpectedType) && value == null)
{
value = Activator.CreateInstance(ExpectedType);
}
ProtoReader.EndSubItem(token, source);
}
return(value);
}