github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/compress/flate/reader_test.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package flate
     6  
     7  import (
     8  	"bytes"
     9  	"io"
    10  	"io/ioutil"
    11  	"runtime"
    12  	"strings"
    13  	"testing"
    14  )
    15  
    16  func TestNlitOutOfRange(t *testing.T) {
    17  	// Trying to decode this bogus flate data, which has a Huffman table
    18  	// with nlit=288, should not panic.
    19  	io.Copy(ioutil.Discard, NewReader(strings.NewReader(
    20  		"\xfc\xfe\x36\xe7\x5e\x1c\xef\xb3\x55\x58\x77\xb6\x56\xb5\x43\xf4"+
    21  			"\x6f\xf2\xd2\xe6\x3d\x99\xa0\x85\x8c\x48\xeb\xf8\xda\x83\x04\x2a"+
    22  			"\x75\xc4\xf8\x0f\x12\x11\xb9\xb4\x4b\x09\xa0\xbe\x8b\x91\x4c")))
    23  }
    24  
    25  const (
    26  	digits = iota
    27  	twain
    28  )
    29  
    30  var testfiles = []string{
    31  	// Digits is the digits of the irrational number e. Its decimal representation
    32  	// does not repeat, but there are only 10 possible digits, so it should be
    33  	// reasonably compressible.
    34  	digits: "../testdata/e.txt",
    35  	// Twain is Project Gutenberg's edition of Mark Twain's classic English novel.
    36  	twain: "../testdata/Mark.Twain-Tom.Sawyer.txt",
    37  }
    38  
    39  func benchmarkDecode(b *testing.B, testfile, level, n int) {
    40  	b.ReportAllocs()
    41  	b.StopTimer()
    42  	b.SetBytes(int64(n))
    43  	buf0, err := ioutil.ReadFile(testfiles[testfile])
    44  	if err != nil {
    45  		b.Fatal(err)
    46  	}
    47  	if len(buf0) == 0 {
    48  		b.Fatalf("test file %q has no data", testfiles[testfile])
    49  	}
    50  	compressed := new(bytes.Buffer)
    51  	w, err := NewWriter(compressed, level)
    52  	if err != nil {
    53  		b.Fatal(err)
    54  	}
    55  	for i := 0; i < n; i += len(buf0) {
    56  		if len(buf0) > n-i {
    57  			buf0 = buf0[:n-i]
    58  		}
    59  		io.Copy(w, bytes.NewReader(buf0))
    60  	}
    61  	w.Close()
    62  	buf1 := compressed.Bytes()
    63  	buf0, compressed, w = nil, nil, nil
    64  	runtime.GC()
    65  	b.StartTimer()
    66  	for i := 0; i < b.N; i++ {
    67  		io.Copy(ioutil.Discard, NewReader(bytes.NewReader(buf1)))
    68  	}
    69  }
    70  
    71  // These short names are so that gofmt doesn't break the BenchmarkXxx function
    72  // bodies below over multiple lines.
    73  const (
    74  	speed    = BestSpeed
    75  	default_ = DefaultCompression
    76  	compress = BestCompression
    77  )
    78  
    79  func BenchmarkDecodeDigitsSpeed1e4(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e4) }
    80  func BenchmarkDecodeDigitsSpeed1e5(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e5) }
    81  func BenchmarkDecodeDigitsSpeed1e6(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e6) }
    82  func BenchmarkDecodeDigitsDefault1e4(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e4) }
    83  func BenchmarkDecodeDigitsDefault1e5(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e5) }
    84  func BenchmarkDecodeDigitsDefault1e6(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e6) }
    85  func BenchmarkDecodeDigitsCompress1e4(b *testing.B) { benchmarkDecode(b, digits, compress, 1e4) }
    86  func BenchmarkDecodeDigitsCompress1e5(b *testing.B) { benchmarkDecode(b, digits, compress, 1e5) }
    87  func BenchmarkDecodeDigitsCompress1e6(b *testing.B) { benchmarkDecode(b, digits, compress, 1e6) }
    88  func BenchmarkDecodeTwainSpeed1e4(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e4) }
    89  func BenchmarkDecodeTwainSpeed1e5(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e5) }
    90  func BenchmarkDecodeTwainSpeed1e6(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e6) }
    91  func BenchmarkDecodeTwainDefault1e4(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e4) }
    92  func BenchmarkDecodeTwainDefault1e5(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e5) }
    93  func BenchmarkDecodeTwainDefault1e6(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e6) }
    94  func BenchmarkDecodeTwainCompress1e4(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e4) }
    95  func BenchmarkDecodeTwainCompress1e5(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e5) }
    96  func BenchmarkDecodeTwainCompress1e6(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e6) }