/usr/share/gocode/src/github.com/klauspost/compress/zlib/writer_test.go is in golang-github-klauspost-compress-dev 0.0~git20151221.0.2dd54ae-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | // Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package zlib
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"testing"
)
var filenames = []string{
"../testdata/e.txt",
"../testdata/pi.txt",
}
var data = []string{
"test a reasonable sized string that can be compressed",
}
// Tests that compressing and then decompressing the given file at the given compression level and dictionary
// yields equivalent bytes to the original file.
func testFileLevelDict(t *testing.T, fn string, level int, d string) {
// Read the file, as golden output.
golden, err := os.Open(fn)
if err != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err)
return
}
defer golden.Close()
b0, err0 := ioutil.ReadAll(golden)
if err0 != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err0)
return
}
testLevelDict(t, fn, b0, level, d)
}
func testLevelDict(t *testing.T, fn string, b0 []byte, level int, d string) {
// Make dictionary, if given.
var dict []byte
if d != "" {
dict = []byte(d)
}
// Push data through a pipe that compresses at the write end, and decompresses at the read end.
piper, pipew := io.Pipe()
defer piper.Close()
go func() {
defer pipew.Close()
zlibw, err := NewWriterLevelDict(pipew, level, dict)
if err != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err)
return
}
defer zlibw.Close()
_, err = zlibw.Write(b0)
if err != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err)
return
}
}()
zlibr, err := NewReaderDict(piper, dict)
if err != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err)
return
}
defer zlibr.Close()
// Compare the decompressed data.
b1, err1 := ioutil.ReadAll(zlibr)
if err1 != nil {
t.Errorf("%s (level=%d, dict=%q): %v", fn, level, d, err1)
return
}
if len(b0) != len(b1) {
t.Errorf("%s (level=%d, dict=%q): length mismatch %d versus %d", fn, level, d, len(b0), len(b1))
return
}
for i := 0; i < len(b0); i++ {
if b0[i] != b1[i] {
t.Errorf("%s (level=%d, dict=%q): mismatch at %d, 0x%02x versus 0x%02x\n", fn, level, d, i, b0[i], b1[i])
return
}
}
}
func testFileLevelDictReset(t *testing.T, fn string, level int, dict []byte) {
var b0 []byte
var err error
if fn != "" {
b0, err = ioutil.ReadFile(fn)
if err != nil {
t.Errorf("%s (level=%d): %v", fn, level, err)
return
}
}
// Compress once.
buf := new(bytes.Buffer)
var zlibw *Writer
if dict == nil {
zlibw, err = NewWriterLevel(buf, level)
} else {
zlibw, err = NewWriterLevelDict(buf, level, dict)
}
if err == nil {
_, err = zlibw.Write(b0)
}
if err == nil {
err = zlibw.Close()
}
if err != nil {
t.Errorf("%s (level=%d): %v", fn, level, err)
return
}
out := buf.String()
// Reset and compress again.
buf2 := new(bytes.Buffer)
zlibw.Reset(buf2)
n, err := zlibw.Write(b0)
if err == nil {
if int(n) != len(b0) {
t.Fatal("Short write:", n, "!=", len(b0))
}
err = zlibw.Close()
}
if err != nil {
t.Errorf("%s (level=%d): %v", fn, level, err)
return
}
out2 := buf2.String()
if out2 != out {
t.Errorf("%s (level=%d): different output after reset (got %d bytes, expected %d)",
fn, level, len(out2), len(out))
}
}
func TestWriter(t *testing.T) {
for i, s := range data {
b := []byte(s)
tag := fmt.Sprintf("#%d", i)
testLevelDict(t, tag, b, DefaultCompression, "")
testLevelDict(t, tag, b, NoCompression, "")
for level := BestSpeed; level <= BestCompression; level++ {
testLevelDict(t, tag, b, level, "")
}
}
}
func TestWriterBig(t *testing.T) {
for _, fn := range filenames {
testFileLevelDict(t, fn, DefaultCompression, "")
testFileLevelDict(t, fn, NoCompression, "")
for level := BestSpeed; level <= BestCompression; level++ {
testFileLevelDict(t, fn, level, "")
}
}
}
func TestWriterDict(t *testing.T) {
const dictionary = "0123456789."
for _, fn := range filenames {
testFileLevelDict(t, fn, DefaultCompression, dictionary)
testFileLevelDict(t, fn, NoCompression, dictionary)
for level := BestSpeed; level <= BestCompression; level++ {
testFileLevelDict(t, fn, level, dictionary)
}
}
}
func TestWriterReset(t *testing.T) {
const dictionary = "0123456789."
for _, fn := range filenames {
testFileLevelDictReset(t, fn, NoCompression, nil)
testFileLevelDictReset(t, fn, DefaultCompression, nil)
testFileLevelDictReset(t, fn, ConstantCompression, nil)
testFileLevelDictReset(t, fn, NoCompression, []byte(dictionary))
testFileLevelDictReset(t, fn, DefaultCompression, []byte(dictionary))
testFileLevelDictReset(t, fn, ConstantCompression, []byte(dictionary))
if !testing.Short() {
for level := BestSpeed; level <= BestCompression; level++ {
testFileLevelDictReset(t, fn, level, nil)
}
}
}
}
func TestWriterDictIsUsed(t *testing.T) {
var input = []byte("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")
var buf bytes.Buffer
compressor, err := NewWriterLevelDict(&buf, BestCompression, input)
if err != nil {
t.Errorf("error in NewWriterLevelDict: %s", err)
return
}
compressor.Write(input)
compressor.Close()
const expectedMaxSize = 35
output := buf.Bytes()
if len(output) > expectedMaxSize {
t.Errorf("result too large (got %d, want <= %d bytes). Is the dictionary being used?", len(output), expectedMaxSize)
}
}
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