// readNextChunk creates an io.LimitedReader for the next chunk of data,
// and returns io.EOF if the last chunk has been read.
func readNextChunk(r wire.SyncScanner) (io.Reader, error) {
id, err := r.ReadOctetString()
if err != nil {
return nil, err
}
switch id {
case "DATA":
return r.ReadBytes()
case "DONE":
return nil, io.EOF
default:
return nil, fmt.Errorf("expected chunk id 'DATA', but got '%s'", id)
}
}
