110 lines
2.6 KiB
Go
110 lines
2.6 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 TestWriter2(t *testing.T) {
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var buf bytes.Buffer
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w, err := Writer2Config{DictCap: 4096}.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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n, err := w.Write([]byte{'a'})
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if err != nil {
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t.Fatalf("w.Write([]byte{'a'}) error %s", err)
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}
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if n != 1 {
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t.Fatalf("w.Write([]byte{'a'}) returned %d; want %d", n, 1)
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}
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if err = w.Flush(); err != nil {
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t.Fatalf("w.Flush() error %s", err)
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}
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// check that double Flush doesn't write another chunk
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if err = w.Flush(); err != nil {
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t.Fatalf("w.Flush() error %s", err)
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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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p := buf.Bytes()
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want := []byte{1, 0, 0, 'a', 0}
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if !bytes.Equal(p, want) {
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t.Fatalf("bytes written %#v; want %#v", p, want)
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}
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}
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func TestCycle1(t *testing.T) {
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var buf bytes.Buffer
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w, err := Writer2Config{DictCap: 4096}.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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n, err := w.Write([]byte{'a'})
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if err != nil {
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t.Fatalf("w.Write([]byte{'a'}) error %s", err)
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}
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if n != 1 {
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t.Fatalf("w.Write([]byte{'a'}) returned %d; want %d", n, 1)
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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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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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p := make([]byte, 3)
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n, err = r.Read(p)
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t.Logf("n %d error %v", n, err)
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}
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func TestCycle2(t *testing.T) {
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buf := new(bytes.Buffer)
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w, err := Writer2Config{DictCap: 4096}.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 = 2100000
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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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