util.go

/*
   Copyright 2018 Banco Bilbao Vizcaya Argentaria, S.A.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package raftbadger

import (
	"bytes"
	"encoding/binary"

	"github.com/hashicorp/go-msgpack/codec"
)

// Decode reverses the encode operation on a byte slice input
func decodeMsgPack(buf []byte, out interface{}) error {
	r := bytes.NewBuffer(buf)
	hd := codec.MsgpackHandle{}
	dec := codec.NewDecoder(r, &hd)
	return dec.Decode(out)
}

// Encode writes an encoded object to a new bytes buffer
func encodeMsgPack(in interface{}) (*bytes.Buffer, error) {
	buf := bytes.NewBuffer(nil)
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(buf, &hd)
	err := enc.Encode(in)
	return buf, err
}

// Converts bytes to an integer
func bytesToUint64(b []byte) uint64 {
	return binary.BigEndian.Uint64(b)
}

// Converts a uint to a byte slice
func uint64ToBytes(u uint64) []byte {
	buf := make([]byte, 8)
	binary.BigEndian.PutUint64(buf, u)
	return buf
}