[Boost-users] Using boost::iostreams::restrict without overconsuming the original stream

Hi, I amy trying to split an incoming streams into multiple substreams (specifically, an incoming cpio stream into its individual files). After parsing the header in the incoming stream, I have the file size, and can use boost::iostreams::restrict to create a substream containing only the file data, which the user can subsequently consume. However some experiments with filtering_streambuf show that it will consume past the end of the substream. Will the same happen with restrict?