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msg_buf.go
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/
msg_buf.go
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/*
* Copyright (C) 2020-2022, IrineSistiana
*
* This file is part of mosdns.
*
* mosdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* mosdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package pool
import (
"github.com/miekg/dns"
)
// There is no such way to give dns.Msg.PackBuffer() a buffer
// with a proper size.
// Just give it a big buf and hope the buf will be reused in most scenes.
const packBufSize = 4096
// PackBuffer packs the dns msg m to wire format.
// Callers should release the buf after they have done with the wire []byte.
func PackBuffer(m *dns.Msg) (wire []byte, buf *Buffer, err error) {
buf = GetBuf(packBufSize)
wire, err = m.PackBuffer(buf.Bytes())
if err != nil {
buf.Release()
return nil, nil, err
}
return wire, buf, nil
}