Copy content via this buffer from the provided src conduit.
The src conduit has its content transferred through this buffer via
a series of fill & drain operations,
until there is no more content available.
The buffer content should be explicitly flushed by the caller.
Copy content via this buffer from the provided src conduit.
The src conduit has its content transferred through this buffer via a series of fill & drain operations, until there is no more content available. The buffer content should be explicitly flushed by the caller.