vendor

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

@@ -0,0 +1,109 @@
+// 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")
+	}
+}