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package pktline
import "io"
// ChunkWriter packetizes arbitrary stream bytes into data pkt-lines.
// It never writes control packets automatically.
type ChunkWriter struct {
enc *Encoder
}
// NewChunkWriter creates a chunking adapter over enc.
func NewChunkWriter(enc *Encoder) *ChunkWriter {
return &ChunkWriter{enc: enc}
}
// Write splits p into data frames not larger than enc's maxData.
//
// It implements io.Writer.
func (cw *ChunkWriter) Write(p []byte) (int, error) {
total := 0
maxData := cw.enc.effectiveMaxData()
for len(p) > 0 {
n := min(len(p), maxData)
err := cw.enc.WriteData(p[:n])
if err != nil {
return total, err
}
total += n
p = p[n:]
}
return total, nil
}
// ReadFrom reads from r and writes pkt-line data frames to the encoder.
//
// It implements io.ReaderFrom.
func (cw *ChunkWriter) ReadFrom(r io.Reader) (int64, error) {
buf := make([]byte, cw.enc.effectiveMaxData())
var total int64
for {
n, err := r.Read(buf)
if n > 0 {
werr := cw.enc.WriteData(buf[:n])
if werr != nil {
return total, werr
}
total += int64(n)
}
if err != nil {
if err == io.EOF {
return total, nil
}
return total, err
}
}
}
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