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writer.go
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writer.go
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package buf
import "io"
// BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.
type BufferToBytesWriter struct {
writer io.Writer
}
// Write implements Writer.Write(). Write() takes ownership of the given buffer.
func (w *BufferToBytesWriter) Write(mb MultiBuffer) error {
defer mb.Release()
bs := mb.ToNetBuffers()
_, err := bs.WriteTo(w.writer)
return err
}
type writerAdapter struct {
writer MultiBufferWriter
}
func (w *writerAdapter) Write(mb MultiBuffer) error {
_, err := w.writer.WriteMultiBuffer(mb)
return err
}
type mergingWriter struct {
writer io.Writer
buffer []byte
}
func (w *mergingWriter) Write(mb MultiBuffer) error {
defer mb.Release()
for !mb.IsEmpty() {
nBytes, _ := mb.Read(w.buffer)
if _, err := w.writer.Write(w.buffer[:nBytes]); err != nil {
return err
}
}
return nil
}
type bytesToBufferWriter struct {
writer Writer
}
func (w *bytesToBufferWriter) Write(payload []byte) (int, error) {
mb := NewMultiBuffer()
for p := payload; len(p) > 0; {
b := New()
nBytes, _ := b.Write(p)
p = p[nBytes:]
mb.Append(b)
}
if err := w.writer.Write(mb); err != nil {
return 0, err
}
return len(payload), nil
}
func (w *bytesToBufferWriter) WriteMulteBuffer(mb MultiBuffer) (int, error) {
return mb.Len(), w.writer.Write(mb)
}
func (w *bytesToBufferWriter) ReadFrom(reader io.Reader) (int64, error) {
mbReader := NewReader(reader)
totalBytes := int64(0)
eof := false
for !eof {
mb, err := mbReader.Read()
if err == io.EOF {
eof = true
} else if err != nil {
return totalBytes, err
}
totalBytes += int64(mb.Len())
if err := w.writer.Write(mb); err != nil {
return totalBytes, err
}
}
return totalBytes, nil
}