pkg/vendor/github.com/ulikunitz/xz/lzma/writer2_test.go

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2018-06-17 06:46:58 +00:00
// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lzma
import (
"bytes"
"io"
"math/rand"
"strings"
"testing"
"github.com/ulikunitz/xz/internal/randtxt"
)
func TestWriter2(t *testing.T) {
var buf bytes.Buffer
w, err := Writer2Config{DictCap: 4096}.NewWriter2(&buf)
if err != nil {
t.Fatalf("NewWriter error %s", err)
}
n, err := w.Write([]byte{'a'})
if err != nil {
t.Fatalf("w.Write([]byte{'a'}) error %s", err)
}
if n != 1 {
t.Fatalf("w.Write([]byte{'a'}) returned %d; want %d", n, 1)
}
if err = w.Flush(); err != nil {
t.Fatalf("w.Flush() error %s", err)
}
// check that double Flush doesn't write another chunk
if err = w.Flush(); err != nil {
t.Fatalf("w.Flush() error %s", err)
}
if err = w.Close(); err != nil {
t.Fatalf("w.Close() error %s", err)
}
p := buf.Bytes()
want := []byte{1, 0, 0, 'a', 0}
if !bytes.Equal(p, want) {
t.Fatalf("bytes written %#v; want %#v", p, want)
}
}
func TestCycle1(t *testing.T) {
var buf bytes.Buffer
w, err := Writer2Config{DictCap: 4096}.NewWriter2(&buf)
if err != nil {
t.Fatalf("NewWriter error %s", err)
}
n, err := w.Write([]byte{'a'})
if err != nil {
t.Fatalf("w.Write([]byte{'a'}) error %s", err)
}
if n != 1 {
t.Fatalf("w.Write([]byte{'a'}) returned %d; want %d", n, 1)
}
if err = w.Close(); err != nil {
t.Fatalf("w.Close() error %s", err)
}
r, err := Reader2Config{DictCap: 4096}.NewReader2(&buf)
if err != nil {
t.Fatalf("NewReader error %s", err)
}
p := make([]byte, 3)
n, err = r.Read(p)
t.Logf("n %d error %v", n, err)
}
func TestCycle2(t *testing.T) {
buf := new(bytes.Buffer)
w, err := Writer2Config{DictCap: 4096}.NewWriter2(buf)
if err != nil {
t.Fatalf("NewWriter error %s", err)
}
// const txtlen = 1024
const txtlen = 2100000
io.CopyN(buf, randtxt.NewReader(rand.NewSource(42)), txtlen)
txt := buf.String()
buf.Reset()
n, err := io.Copy(w, strings.NewReader(txt))
if err != nil {
t.Fatalf("Compressing copy error %s", err)
}
if n != txtlen {
t.Fatalf("Compressing data length %d; want %d", n, txtlen)
}
if err = w.Close(); err != nil {
t.Fatalf("w.Close error %s", err)
}
t.Logf("buf.Len() %d", buf.Len())
r, err := Reader2Config{DictCap: 4096}.NewReader2(buf)
if err != nil {
t.Fatalf("NewReader error %s", err)
}
out := new(bytes.Buffer)
n, err = io.Copy(out, r)
if err != nil {
t.Fatalf("Decompressing copy error %s after %d bytes", err, n)
}
if n != txtlen {
t.Fatalf("Decompression data length %d; want %d", n, txtlen)
}
if txt != out.String() {
t.Fatal("decompressed data differs from original")
}
}