private static SubItemToken StartSubItem(object instance, ProtoWriter writer, bool allowFixed)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
if (++writer.depth > RecursionCheckDepth)
{
writer.CheckRecursionStackAndPush(instance);
}
if (writer.packedFieldNumber != 0)
{
throw new InvalidOperationException("Cannot begin a sub-item while performing packed encoding");
}
switch (writer.wireType)
{
case WireType.StartGroup:
writer.wireType = WireType.None;
return(new SubItemToken(-writer.fieldNumber));
case WireType.String:
#if DEBUG
if (writer.model != null && writer.model.ForwardsOnly)
{
throw new ProtoException("Should not be buffering data");
}
#endif
writer.wireType = WireType.None;
DemandSpace(32, writer); // make some space in anticipation...
writer.flushLock++;
writer.position++;
return(new SubItemToken(writer.ioIndex++)); // leave 1 space (optimistic) for length
case WireType.Fixed32:
{
if (!allowFixed)
{
throw CreateException(writer);
}
DemandSpace(32, writer); // make some space in anticipation...
writer.flushLock++;
SubItemToken token = new SubItemToken(writer.ioIndex);
ProtoWriter.IncrementedAndReset(4, writer); // leave 4 space (rigid) for length
return(token);
}
default:
throw CreateException(writer);
}
}