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