mirror of https://go.googlesource.com/go
73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package zstd
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import (
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"bytes"
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"fmt"
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"testing"
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)
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func makeSequence(start, n int) (seq []byte) {
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for i := 0; i < n; i++ {
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seq = append(seq, byte(start+i))
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}
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return
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}
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func TestWindow(t *testing.T) {
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for size := 0; size <= 3; size++ {
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for i := 0; i <= 2*size; i++ {
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a := makeSequence('a', i)
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for j := 0; j <= 2*size; j++ {
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b := makeSequence('a'+i, j)
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for k := 0; k <= 2*size; k++ {
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c := makeSequence('a'+i+j, k)
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t.Run(fmt.Sprintf("%d-%d-%d-%d", size, i, j, k), func(t *testing.T) {
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testWindow(t, size, a, b, c)
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})
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}
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}
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}
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}
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}
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// testWindow tests window by saving three sequences of bytes to it.
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// Third sequence tests read offset that can become non-zero only after second save.
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func testWindow(t *testing.T, size int, a, b, c []byte) {
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var w window
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w.reset(size)
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w.save(a)
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w.save(b)
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w.save(c)
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var tail []byte
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tail = append(tail, a...)
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tail = append(tail, b...)
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tail = append(tail, c...)
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if len(tail) > size {
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tail = tail[len(tail)-size:]
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}
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if w.len() != uint32(len(tail)) {
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t.Errorf("wrong data length: got: %d, want: %d", w.len(), len(tail))
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}
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var from, to uint32
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for from = 0; from <= uint32(len(tail)); from++ {
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for to = from; to <= uint32(len(tail)); to++ {
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got := w.appendTo(nil, from, to)
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want := tail[from:to]
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if !bytes.Equal(got, want) {
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t.Errorf("wrong data at [%d:%d]: got %q, want %q", from, to, got, want)
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}
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}
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}
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}
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