Method CheckRemoteTypeMetaLimits

csharp/src/Fory/ReadContext.cs:166–207

(TypeMeta typeMeta)

    }

    [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
    private object CheckRemoteTypeMetaLimits(TypeMeta typeMeta)
    {
        object typeKey;
        if (typeMeta.RegisterByName)
        {
            typeKey = $"{typeMeta.NamespaceName.Value}\0{typeMeta.TypeName.Value}";
        }
        else if (typeMeta.UserTypeId.HasValue)
        {
            typeKey = typeMeta.UserTypeId.Value;
        }
        else
        {
            throw new InvalidDataException("remote metadata is missing type identity");
        }
        _remoteSchemaVersionsByType.TryGetValue(typeKey, out int versionsForType);
        int maxSchemaVersionsPerType = _config.MaxSchemaVersionsPerType;
        if (versionsForType >= maxSchemaVersionsPerType)
        {
            throw new InvalidDataException(
                $"Remote schema version limit exceeded for type {typeKey}: {versionsForType} >= {maxSchemaVersionsPerType}. " +
                "The data may be malicious. If the data is not malicious, please increase MaxSchemaVersionsPerType.");
        }

        int acceptedTypeCount = versionsForType == 0
            ? _remoteSchemaVersionsByType.Count + 1
            : _remoteSchemaVersionsByType.Count;
        int maxAverageSchemaVersionsPerType = _config.MaxAverageSchemaVersionsPerType;
        long globalLimit = Math.Max(
            MinRemoteTypeMetaLimit,
            (long)acceptedTypeCount * maxAverageSchemaVersionsPerType);
        if (_totalAcceptedSchemaVersions >= globalLimit)
        {
            throw new InvalidDataException(
                $"Remote schema version limit exceeded: {_totalAcceptedSchemaVersions} metadata versions for " +
                $"{acceptedTypeCount} accepted remote types exceeds the average limit {maxAverageSchemaVersionsPerType}. " +
                "The data may be malicious. If the data is not malicious, please increase MaxAverageSchemaVersionsPerType.");
        }

        return typeKey;
    }

    private void RecordRemoteTypeMetaVersion(object typeKey)
    {