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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// 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 hashing provides common hashing utilities.
package hashing
import (
"encoding/hex"
"io"
"sync"
"github.com/cespare/xxhash/v2"
)
// XXHashFromReader calculates the xxHash for the given reader.
func XXHashFromReader(r io.ReadSeeker) (uint64, int64, error) {
h := getXxHashReadFrom()
defer putXxHashReadFrom(h)
size, err := io.Copy(h, r)
if err != nil {
return 0, 0, err
}
return h.Sum64(), size, nil
}
// XXHashFromString calculates the xxHash for the given string.
func XXHashFromString(s string) (uint64, error) {
h := xxhash.New()
h.WriteString(s)
return h.Sum64(), nil
}
// XxHashFromStringHexEncoded calculates the xxHash for the given string
// and returns the hash as a hex encoded string.
func XxHashFromStringHexEncoded(f string) string {
h := xxhash.New()
h.WriteString(f)
hash := h.Sum(nil)
return hex.EncodeToString(hash)
}
type xxhashReadFrom struct {
buff []byte
*xxhash.Digest
}
func (x *xxhashReadFrom) ReadFrom(r io.Reader) (int64, error) {
for {
n, err := r.Read(x.buff)
if n > 0 {
x.Digest.Write(x.buff[:n])
}
if err != nil {
if err == io.EOF {
err = nil
}
return int64(n), err
}
}
}
var xXhashReadFromPool = sync.Pool{
New: func() any {
return &xxhashReadFrom{Digest: xxhash.New(), buff: make([]byte, 48*1024)}
},
}
func getXxHashReadFrom() *xxhashReadFrom {
return xXhashReadFromPool.Get().(*xxhashReadFrom)
}
func putXxHashReadFrom(h *xxhashReadFrom) {
h.Reset()
xXhashReadFromPool.Put(h)
}
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