2014-10-18 02:41:22 +04:00
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/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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2014-09-04 02:10:15 +04:00
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package wal
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import (
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"bufio"
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"encoding/binary"
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"hash"
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"io"
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2014-09-25 21:50:33 +04:00
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"github.com/coreos/etcd/pkg/crc"
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2014-09-04 03:46:42 +04:00
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"github.com/coreos/etcd/wal/walpb"
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2014-09-04 02:10:15 +04:00
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)
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type encoder struct {
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bw *bufio.Writer
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crc hash.Hash32
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}
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func newEncoder(w io.Writer, prevCrc uint32) *encoder {
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return &encoder{
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bw: bufio.NewWriter(w),
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crc: crc.New(prevCrc, crcTable),
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}
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}
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2014-09-04 03:46:42 +04:00
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func (e *encoder) encode(rec *walpb.Record) error {
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2014-09-04 02:10:15 +04:00
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e.crc.Write(rec.Data)
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rec.Crc = e.crc.Sum32()
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data, err := rec.Marshal()
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if err != nil {
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return err
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}
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if err := writeInt64(e.bw, int64(len(data))); err != nil {
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return err
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}
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_, err = e.bw.Write(data)
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return err
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}
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func (e *encoder) flush() error {
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return e.bw.Flush()
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}
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func (e *encoder) buffered() int {
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return e.bw.Buffered()
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}
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func writeInt64(w io.Writer, n int64) error {
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return binary.Write(w, binary.LittleEndian, n)
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}
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