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io.go
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/
io.go
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package codec
import (
"encoding/binary"
"io"
"net"
)
func sendFrame(w io.Writer, data []byte) error {
var size [binary.MaxVarintLen64]byte
if len(data) == 0 {
n := binary.PutUvarint(size[:], 0)
return write(w, size[:n])
}
n := binary.PutUvarint(size[:], uint64(len(data)))
if err := write(w, size[:n]); err != nil {
return err
}
return write(w, data)
}
func recvFrame(r io.Reader) (data []byte, err error) {
size, err := binary.ReadUvarint(r.(io.ByteReader))
if err != nil {
return nil, err
}
if size != 0 {
data = make([]byte, size)
if err = read(r, data); err != nil {
return nil, err
}
}
return data, nil
}
func write(w io.Writer, data []byte) error {
for i := 0; i < len(data); {
n, err := w.Write(data[i:])
if err != nil {
if _, ok := err.(net.Error); !ok {
return err
}
}
i += n
}
return nil
}
func read(r io.Reader, data []byte) error {
for i := 0; i < len(data); {
n, err := r.Read(data[i:])
if err != nil {
if _, ok := err.(net.Error); !ok {
return err
}
}
i += n
}
return nil
}