blob: b2f2765e5ab70b08092d831e25cc10f067f94a2f [file] [log] [blame]
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"encoding/binary"
"errors"
"net"
)
type packetAdaptor struct {
net.Conn
}
func newPacketAdaptor(conn net.Conn) net.Conn {
return &packetAdaptor{conn}
}
func (p *packetAdaptor) Read(b []byte) (int, error) {
var length uint32
if err := binary.Read(p.Conn, binary.BigEndian, &length); err != nil {
return 0, err
}
out := make([]byte, length)
n, err := p.Conn.Read(out)
if err != nil {
return 0, err
}
if n != int(length) {
return 0, errors.New("internal error: length mismatch!")
}
return copy(b, out), nil
}
func (p *packetAdaptor) Write(b []byte) (int, error) {
length := uint32(len(b))
if err := binary.Write(p.Conn, binary.BigEndian, length); err != nil {
return 0, err
}
n, err := p.Conn.Write(b)
if err != nil {
return 0, err
}
if n != len(b) {
return 0, errors.New("internal error: length mismatch!")
}
return len(b), nil
}