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d5eda13cb2
Note that we only use this for change detection. The previous implementation invoked `MD5FromReaderFast` that created a MD5 has from 8 64 bytes chunks in the file, which is obviously very fast. The new implementation creates the hash from the entire file and ... seems to be even more effective: ``` name old time/op new time/op delta HashImage-10 9.45µs ±21% 10.89µs ± 1% ~ (p=0.343 n=4+4) name old alloc/op new alloc/op delta HashImage-10 144B ± 0% 8B ± 0% -94.44% (p=0.029 n=4+4) name old allocs/op new allocs/op delta HashImage-10 4.00 ± 0% 1.00 ± 0% -75.00% (p=0.029 n=4+4) ```
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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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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//
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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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package hashing
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import (
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"strings"
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"testing"
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"github.com/cespare/xxhash/v2"
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qt "github.com/frankban/quicktest"
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)
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func TestXxHashFromReader(t *testing.T) {
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c := qt.New(t)
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s := "Hello World"
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r := strings.NewReader(s)
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got, size, err := XXHashFromReader(r)
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c.Assert(err, qt.IsNil)
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c.Assert(size, qt.Equals, int64(len(s)))
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c.Assert(got, qt.Equals, uint64(7148569436472236994))
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}
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func TestXxHashFromString(t *testing.T) {
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c := qt.New(t)
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s := "Hello World"
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got, err := XXHashFromString(s)
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c.Assert(err, qt.IsNil)
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c.Assert(got, qt.Equals, uint64(7148569436472236994))
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}
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func TestXxHashFromStringHexEncoded(t *testing.T) {
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c := qt.New(t)
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s := "The quick brown fox jumps over the lazy dog"
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got := XxHashFromStringHexEncoded(s)
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// Facit: https://asecuritysite.com/encryption/xxhash?val=The%20quick%20brown%20fox%20jumps%20over%20the%20lazy%20dog
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c.Assert(got, qt.Equals, "0b242d361fda71bc")
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}
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func BenchmarkXXHashFromReader(b *testing.B) {
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r := strings.NewReader("Hello World")
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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XXHashFromReader(r)
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r.Seek(0, 0)
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}
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}
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func BenchmarkXXHashFromString(b *testing.B) {
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s := "Hello World"
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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XXHashFromString(s)
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}
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}
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func BenchmarkXXHashFromStringHexEncoded(b *testing.B) {
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s := "The quick brown fox jumps over the lazy dog"
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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XxHashFromStringHexEncoded(s)
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}
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}
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func xxHashFromString(f string) uint64 {
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h := xxhash.New()
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h.WriteString(f)
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return h.Sum64()
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}
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