reader_test.go

Documentation: github.com/klauspost/compress/flate

     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  	"os"
    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(io.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  	random
    29  )
    30  
    31  var testfiles = []string{
    32  	// Digits is the digits of the irrational number e. Its decimal representation
    33  	// does not repeat, but there are only 10 possible digits, so it should be
    34  	// reasonably compressible.
    35  	digits: "../testdata/e.txt",
    36  	// Twain is Project Gutenberg's edition of Mark Twain's classic English novel.
    37  	twain: "../testdata/Mark.Twain-Tom.Sawyer.txt",
    38  	// Random bytes
    39  	random: "../testdata/sharnd.out",
    40  }
    41  
    42  func benchmarkDecode(b *testing.B, testfile, level, n int) {
    43  	b.ReportAllocs()
    44  	b.StopTimer()
    45  	b.SetBytes(int64(n))
    46  	buf0, err := os.ReadFile(testfiles[testfile])
    47  	if err != nil {
    48  		b.Fatal(err)
    49  	}
    50  	if len(buf0) == 0 {
    51  		b.Fatalf("test file %q has no data", testfiles[testfile])
    52  	}
    53  	compressed := new(bytes.Buffer)
    54  	w, err := NewWriter(compressed, level)
    55  	if err != nil {
    56  		b.Fatal(err)
    57  	}
    58  	for i := 0; i < n; i += len(buf0) {
    59  		if len(buf0) > n-i {
    60  			buf0 = buf0[:n-i]
    61  		}
    62  		io.Copy(w, bytes.NewReader(buf0))
    63  	}
    64  	w.Close()
    65  	buf1 := compressed.Bytes()
    66  	buf0, compressed, w = nil, nil, nil
    67  	r := NewReader(bytes.NewReader(buf1))
    68  	res := r.(Resetter)
    69  	runtime.GC()
    70  	b.StartTimer()
    71  
    72  	for i := 0; i < b.N; i++ {
    73  		_ = res.Reset(bytes.NewReader(buf1), nil)
    74  		_, _ = io.Copy(io.Discard, r)
    75  	}
    76  }
    77  
    78  // These short names are so that gofmt doesn't break the BenchmarkXxx function
    79  // bodies below over multiple lines.
    80  const (
    81  	constant = ConstantCompression
    82  	speed    = BestSpeed
    83  	default_ = DefaultCompression
    84  	compress = BestCompression
    85  	oneK     = -1024
    86  )
    87  
    88  func BenchmarkDecodeDigitsSpeed1e4(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e4) }
    89  func BenchmarkDecodeDigitsSpeed1e5(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e5) }
    90  func BenchmarkDecodeDigitsSpeed1e6(b *testing.B)    { benchmarkDecode(b, digits, speed, 1e6) }
    91  func BenchmarkDecodeDigitsDefault1e4(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e4) }
    92  func BenchmarkDecodeDigitsDefault1e5(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e5) }
    93  func BenchmarkDecodeDigitsDefault1e6(b *testing.B)  { benchmarkDecode(b, digits, default_, 1e6) }
    94  func BenchmarkDecodeDigitsCompress1e4(b *testing.B) { benchmarkDecode(b, digits, compress, 1e4) }
    95  func BenchmarkDecodeDigitsCompress1e5(b *testing.B) { benchmarkDecode(b, digits, compress, 1e5) }
    96  func BenchmarkDecodeDigitsCompress1e6(b *testing.B) { benchmarkDecode(b, digits, compress, 1e6) }
    97  func BenchmarkDecodeTwainSpeed1e4(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e4) }
    98  func BenchmarkDecodeTwainSpeed1e5(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e5) }
    99  func BenchmarkDecodeTwainSpeed1e6(b *testing.B)     { benchmarkDecode(b, twain, speed, 1e6) }
   100  func BenchmarkDecodeTwainDefault1e4(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e4) }
   101  func BenchmarkDecodeTwainDefault1e5(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e5) }
   102  func BenchmarkDecodeTwainDefault1e6(b *testing.B)   { benchmarkDecode(b, twain, default_, 1e6) }
   103  func BenchmarkDecodeTwainCompress1e4(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e4) }
   104  func BenchmarkDecodeTwainCompress1e5(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e5) }
   105  func BenchmarkDecodeTwainCompress1e6(b *testing.B)  { benchmarkDecode(b, twain, compress, 1e6) }
   106  func BenchmarkDecodeRandomSpeed1e4(b *testing.B)    { benchmarkDecode(b, random, speed, 1e4) }
   107  func BenchmarkDecodeRandomSpeed1e5(b *testing.B)    { benchmarkDecode(b, random, speed, 1e5) }
   108  func BenchmarkDecodeRandomSpeed1e6(b *testing.B)    { benchmarkDecode(b, random, speed, 1e6) }
   109
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