// Copyright 2017 The Cockroach Authors.
//
// 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 util

import (
	"hash/crc32"

	"github.com/pkg/errors"
)

// CRC32 computes the Castagnoli CRC32 of the given data.
func CRC32(data []byte) uint32 {
	hash := crc32.New(crc32.MakeTable(crc32.Castagnoli))
	if _, err := hash.Write(data); err != nil {
		panic(errors.Wrap(err, `"It never returns an error." -- https://golang.org/pkg/hash`))
	}
	return hash.Sum32()
}