108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
// Copyright 2014-2017 Ulrich Kunitz. 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 lzma
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import (
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"bytes"
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"io"
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"math/rand"
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"strings"
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"testing"
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"github.com/ulikunitz/xz/internal/randtxt"
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)
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func TestBinTree_Find(t *testing.T) {
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bt, err := newBinTree(30)
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if err != nil {
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t.Fatal(err)
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}
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const s = "Klopp feiert mit Liverpool seinen hoechsten SiegSieg"
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n, err := io.WriteString(bt, s)
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if err != nil {
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t.Fatalf("WriteString error %s", err)
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}
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if n != len(s) {
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t.Fatalf("WriteString returned %d; want %d", n, len(s))
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}
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/* dump info writes the complete tree
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if err = bt.dump(os.Stdout); err != nil {
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t.Fatalf("bt.dump error %s", err)
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}
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*/
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tests := []string{"Sieg", "Sieb", "Simu"}
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for _, c := range tests {
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x := xval([]byte(c))
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a, b := bt.search(bt.root, x)
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t.Logf("%q: a, b == %d, %d", c, a, b)
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}
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}
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func TestBinTree_PredSucc(t *testing.T) {
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bt, err := newBinTree(30)
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if err != nil {
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t.Fatal(err)
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}
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const s = "Klopp feiert mit Liverpool seinen hoechsten Sieg."
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n, err := io.WriteString(bt, s)
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if err != nil {
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t.Fatalf("WriteString error %s", err)
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}
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if n != len(s) {
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t.Fatalf("WriteString returned %d; want %d", n, len(s))
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}
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for v := bt.min(bt.root); v != null; v = bt.succ(v) {
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t.Log(dumpX(bt.node[v].x))
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}
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t.Log("")
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for v := bt.max(bt.root); v != null; v = bt.pred(v) {
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t.Log(dumpX(bt.node[v].x))
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}
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}
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func TestBinTree_Cycle(t *testing.T) {
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buf := new(bytes.Buffer)
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w, err := Writer2Config{
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DictCap: 4096,
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Matcher: BinaryTree,
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}.NewWriter2(buf)
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if err != nil {
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t.Fatalf("NewWriter error %s", err)
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}
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// const txtlen = 1024
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const txtlen = 10000
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io.CopyN(buf, randtxt.NewReader(rand.NewSource(42)), txtlen)
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txt := buf.String()
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buf.Reset()
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n, err := io.Copy(w, strings.NewReader(txt))
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if err != nil {
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t.Fatalf("Compressing copy error %s", err)
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}
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if n != txtlen {
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t.Fatalf("Compressing data length %d; want %d", n, txtlen)
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}
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if err = w.Close(); err != nil {
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t.Fatalf("w.Close error %s", err)
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}
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t.Logf("buf.Len() %d", buf.Len())
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r, err := Reader2Config{DictCap: 4096}.NewReader2(buf)
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if err != nil {
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t.Fatalf("NewReader error %s", err)
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}
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out := new(bytes.Buffer)
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n, err = io.Copy(out, r)
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if err != nil {
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t.Fatalf("Decompressing copy error %s after %d bytes", err, n)
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}
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if n != txtlen {
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t.Fatalf("Decompression data length %d; want %d", n, txtlen)
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}
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if txt != out.String() {
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t.Fatal("decompressed data differs from original")
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}
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}
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