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package frame
import (
"io"
)
const (
// data frames are actually longer, but they are variable length
dataFrameSize = headerSize
)
type RStreamData struct {
Header
fixed [dataFrameSize]byte
toRead io.LimitedReader // when reading, the underlying connection's io.Reader is handed up
}
func (f *RStreamData) Reader() io.Reader {
return &f.toRead
}
func (f *RStreamData) readFrom(d deserializer) (err error) {
// not using io.LimitReader to avoid a heap memory allocation in the hot path
f.toRead.R = d
f.toRead.N = int64(f.Length())
return
}
// WStreamData is a StreamData frame that you can write
// It delivers opaque data on a stream to the application layer
type WStreamData struct {
Header
fixed [dataFrameSize]byte
toWrite []byte // when writing, you just pass a byte slice to write
}
func (f *WStreamData) writeTo(s serializer) (err error) {
if _, err = s.Write(f.fixed[:]); err != nil {
return err
}
if _, err = s.Write(f.toWrite); err != nil {
return err
}
return
}
func (f *WStreamData) Set(streamId StreamId, data []byte, fin bool) (err error) {
var flags flagsType
if fin {
flags.Set(flagFin)
}
if err = f.Header.SetAll(TypeStreamData, len(data), streamId, flags); err != nil {
return
}
f.toWrite = data
return
}
func NewWStreamData() (f *WStreamData) {
f = new(WStreamData)
f.Header = f.fixed[:headerSize]
return
}
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