CODEWITHSUNDEEP
protobuf-net
mynkow
mynkow

Reputation: 4548

Need clarification about Protobuf-net RuntimeTypeModel

I am using Protobuf-net with DataContracts. I register types this way:

RuntimeTypeModel.Default[typeA].AddSubType(fieldNumber, typeB);

The problem is that fieldNumber is explicitly restricted inside protobuf-net code to accept integers which are > 0 and < Int32.Max/4.

internal static void WriteHeaderCore(int fieldNumber, WireType wireType, ProtoWriter writer)
        {
            uint header = (((uint)fieldNumber) << 3)
                | (((uint)wireType) & 7);
            WriteUInt32Variant(header, writer);
        }

Line 185

What was the reason doing it this way? Backward compatibility? CrossPlatform compatibility? Possible bug?

UPDATE to show how I use DataContracts

    // this guid is transformed to integer and it is a special one so brotobuf-net does not blow up.
    // That way I can safely rename the class whenever I want. Same for properies.
    [DataContract(Name = "c8978654-4380-44d2-8ebe-ae17a463dfb6")] 
    public class UserState 
    {
        UserState() { }

        [DataMember(Order = 1)]
        public override UserId Id { get; set; }

        [DataMember(Order = 2)]
        public string Firstname { get; private set; }

    }

Upvotes: 2

Views: 112

Answers (1)

wal
wal

Reputation: 17749

It is per the protobuf spec

The smallest tag number you can specify is 1, and the largest is 2^29 - 1, or 536,870,911. You also cannot use the numbers 19000 though 19999

Upvotes: 2

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