libgo/go/compress/flate/huffman_bit_writer_test.go

   1 // Copyright 2016 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         "flag"
  10         "fmt"
  11         "io/ioutil"
  12         "os"
  13         "path/filepath"
  14         "strings"
  15         "testing"
  16 )
  17
  18 var update = flag.Bool("update", false, "update reference files")
  19
  20 // TestBlockHuff tests huffman encoding against reference files
  21 // to detect possible regressions.
  22 // If encoding/bit allocation changes you can regenerate these files
  23 // by using the -update flag.
  24 func TestBlockHuff(t *testing.T) {
  25         // determine input files
  26         match, err := filepath.Glob("testdata/huffman-*.in")
  27         if err != nil {
  28                 t.Fatal(err)
  29         }
  30
  31         for _, in := range match {
  32                 out := in // for files where input and output are identical
  33                 if strings.HasSuffix(in, ".in") {
  34                         out = in[:len(in)-len(".in")] + ".golden"
  35                 }
  36                 testBlockHuff(t, in, out)
  37         }
  38 }
  39
  40 func testBlockHuff(t *testing.T, in, out string) {
  41         all, err := ioutil.ReadFile(in)
  42         if err != nil {
  43                 t.Error(err)
  44                 return
  45         }
  46         var buf bytes.Buffer
  47         bw := newHuffmanBitWriter(&buf)
  48         bw.writeBlockHuff(false, all)
  49         bw.flush()
  50         got := buf.Bytes()
  51
  52         want, err := ioutil.ReadFile(out)
  53         if err != nil && !*update {
  54                 t.Error(err)
  55                 return
  56         }
  57
  58         t.Logf("Testing %q", in)
  59         if !bytes.Equal(got, want) {
  60                 if *update {
  61                         if in != out {
  62                                 t.Logf("Updating %q", out)
  63                                 if err := ioutil.WriteFile(out, got, 0666); err != nil {
  64                                         t.Error(err)
  65                                 }
  66                                 return
  67                         }
  68                         // in == out: don't accidentally destroy input
  69                         t.Errorf("WARNING: -update did not rewrite input file %s", in)
  70                 }
  71
  72                 t.Errorf("%q != %q (see %q)", in, out, in+".got")
  73                 if err := ioutil.WriteFile(in+".got", got, 0666); err != nil {
  74                         t.Error(err)
  75                 }
  76                 return
  77         }
  78         t.Log("Output ok")
  79
  80         // Test if the writer produces the same output after reset.
  81         buf.Reset()
  82         bw.reset(&buf)
  83         bw.writeBlockHuff(false, all)
  84         bw.flush()
  85         got = buf.Bytes()
  86         if !bytes.Equal(got, want) {
  87                 t.Errorf("after reset %q != %q (see %q)", in, out, in+".reset.got")
  88                 if err := ioutil.WriteFile(in+".reset.got", got, 0666); err != nil {
  89                         t.Error(err)
  90                 }
  91                 return
  92         }
  93         t.Log("Reset ok")
  94         testWriterEOF(t, "huff", huffTest{input: in}, true)
  95 }
  96
  97 type huffTest struct {
  98         tokens      []token
  99         input       string // File name of input data matching the tokens.
 100         want        string // File name of data with the expected output with input available.
 101         wantNoInput string // File name of the expected output when no input is available.
 102 }
 103
 104 const ml = 0x7fc00000 // Maximum length token. Used to reduce the size of writeBlockTests
 105
 106 var writeBlockTests = []huffTest{
 107         {
 108                 input:       "testdata/huffman-null-max.in",
 109                 want:        "testdata/huffman-null-max.%s.expect",
 110                 wantNoInput: "testdata/huffman-null-max.%s.expect-noinput",
 111                 tokens:      []token{0x0, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 0x0, 0x0},
 112         },
 113         {
 114                 input:       "testdata/huffman-pi.in",
 115                 want:        "testdata/huffman-pi.%s.expect",
 116                 wantNoInput: "testdata/huffman-pi.%s.expect-noinput",
 117                 tokens:      []token{0x33, 0x2e, 0x31, 0x34, 0x31, 0x35, 0x39, 0x32, 0x36, 0x35, 0x33, 0x35, 0x38, 0x39, 0x37, 0x39, 0x33, 0x32, 0x33, 0x38, 0x34, 0x36, 0x32, 0x36, 0x34, 0x33, 0x33, 0x38, 0x33, 0x32, 0x37, 0x39, 0x35, 0x30, 0x32, 0x38, 0x38, 0x34, 0x31, 0x39, 0x37, 0x31, 0x36, 0x39, 0x33, 0x39, 0x39, 0x33, 0x37, 0x35, 0x31, 0x30, 0x35, 0x38, 0x32, 0x30, 0x39, 0x37, 0x34, 0x39, 0x34, 0x34, 0x35, 0x39, 0x32, 0x33, 0x30, 0x37, 0x38, 0x31, 0x36, 0x34, 0x30, 0x36, 0x32, 0x38, 0x36, 0x32, 0x30, 0x38, 0x39, 0x39, 0x38, 0x36, 0x32, 0x38, 0x30, 0x33, 0x34, 0x38, 0x32, 0x35, 0x33, 0x34, 0x32, 0x31, 0x31, 0x37, 0x30, 0x36, 0x37, 0x39, 0x38, 0x32, 0x31, 0x34, 0x38, 0x30, 0x38, 0x36, 0x35, 0x31, 0x33, 0x32, 0x38, 0x32, 0x33, 0x30, 0x36, 0x36, 0x34, 0x37, 0x30, 0x39, 0x33, 0x38, 0x34, 0x34, 0x36, 0x30, 0x39, 0x35, 0x35, 0x30, 0x35, 0x38, 0x32, 0x32, 0x33, 0x31, 0x37, 0x32, 0x35, 0x33, 0x35, 0x39, 0x34, 0x30, 0x38, 0x31, 0x32, 0x38, 0x34, 0x38, 0x31, 0x31, 0x31, 0x37, 0x34, 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 118         },
 119         {
 120                 input:       "testdata/huffman-rand-1k.in",
 121                 want:        "testdata/huffman-rand-1k.%s.expect",
 122                 wantNoInput: "testdata/huffman-rand-1k.%s.expect-noinput",
 123                 tokens:      []token{0xf8, 0x8b, 0x96, 0x76, 0x48, 0xd, 0x85, 0x94, 0x25, 0x80, 0xaf, 0xc2, 0xfe, 0x8d, 0xe8, 0x20, 0xeb, 0x17, 0x86, 0xc9, 0xb7, 0xc5, 0xde, 0x6, 0xea, 0x7d, 0x18, 0x8b, 0xe7, 0x3e, 0x7, 0xda, 0xdf, 0xff, 0x6c, 0x73, 0xde, 0xcc, 0xe7, 0x6d, 0x8d, 0x4, 0x19, 0x49, 0x7f, 0x47, 0x1f, 0x48, 0x15, 0xb0, 0xe8, 0x9e, 0xf2, 0x31, 0x59, 0xde, 0x34, 0xb4, 0x5b, 0xe5, 0xe0, 0x9, 0x11, 0x30, 0xc2, 0x88, 0x5b, 0x7c, 0x5d, 0x14, 0x13, 0x6f, 0x23, 0xa9, 0xd, 0xbc, 0x2d, 0x23, 0xbe, 0xd9, 0xed, 0x75, 0x4, 0x6c, 0x99, 0xdf, 0xfd, 0x70, 0x66, 0xe6, 0xee, 0xd9, 0xb1, 0x9e, 0x6e, 0x83, 0x59, 0xd5, 0xd4, 0x80, 0x59, 0x98, 0x77, 0x89, 0x43, 0x38, 0xc9, 0xaf, 0x30, 0x32, 0x9a, 0x20, 0x1b, 0x46, 0x3d, 0x67, 0x6e, 0xd7, 0x72, 0x9e, 0x4e, 0x21, 0x4f, 0xc6, 0xe0, 0xd4, 0x7b, 0x4, 0x8d, 0xa5, 0x3, 0xf6, 0x5, 0x9b, 0x6b, 0xdc, 0x2a, 0x93, 0x77, 0x28, 0xfd, 0xb4, 0x62, 0xda, 0x20, 0xe7, 0x1f, 0xab, 0x6b, 0x51, 0x43, 0x39, 0x2f, 0xa0, 0x92, 0x1, 0x6c, 0x75, 0x3e, 0xf4, 0x35, 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 124         },
 125         {
 126                 input:       "testdata/huffman-rand-limit.in",
 127                 want:        "testdata/huffman-rand-limit.%s.expect",
 128                 wantNoInput: "testdata/huffman-rand-limit.%s.expect-noinput",
 129                 tokens:      []token{0x61, 0x51c00000, 0xa, 0xf8, 0x8b, 0x96, 0x76, 0x48, 0xa, 0x85, 0x94, 0x25, 0x80, 0xaf, 0xc2, 0xfe, 0x8d, 0xe8, 0x20, 0xeb, 0x17, 0x86, 0xc9, 0xb7, 0xc5, 0xde, 0x6, 0xea, 0x7d, 0x18, 0x8b, 0xe7, 0x3e, 0x7, 0xda, 0xdf, 0xff, 0x6c, 0x73, 0xde, 0xcc, 0xe7, 0x6d, 0x8d, 0x4, 0x19, 0x49, 0x7f, 0x47, 0x1f, 0x48, 0x15, 0xb0, 0xe8, 0x9e, 0xf2, 0x31, 0x59, 0xde, 0x34, 0xb4, 0x5b, 0xe5, 0xe0, 0x9, 0x11, 0x30, 0xc2, 0x88, 0x5b, 0x7c, 0x5d, 0x14, 0x13, 0x6f, 0x23, 0xa9, 0xa, 0xbc, 0x2d, 0x23, 0xbe, 0xd9, 0xed, 0x75, 0x4, 0x6c, 0x99, 0xdf, 0xfd, 0x70, 0x66, 0xe6, 0xee, 0xd9, 0xb1, 0x9e, 0x6e, 0x83, 0x59, 0xd5, 0xd4, 0x80, 0x59, 0x98, 0x77, 0x89, 0x43, 0x38, 0xc9, 0xaf, 0x30, 0x32, 0x9a, 0x20, 0x1b, 0x46, 0x3d, 0x67, 0x6e, 0xd7, 0x72, 0x9e, 0x4e, 0x21, 0x4f, 0xc6, 0xe0, 0xd4, 0x7b, 0x4, 0x8d, 0xa5, 0x3, 0xf6, 0x5, 0x9b, 0x6b, 0xdc, 0x2a, 0x93, 0x77, 0x28, 0xfd, 0xb4, 0x62, 0xda, 0x20, 0xe7, 0x1f, 0xab, 0x6b, 0x51, 0x43, 0x39, 0x2f, 0xa0, 0x92, 0x1, 0x6c, 0x75, 0x3e, 0xf4, 0x35, 0xfd, 0x43, 0x2e, 0xf7, 0xa4, 0x75, 0xda, 0xea, 0x9b, 0xa},
 130         },
 131         {
 132                 input:       "testdata/huffman-shifts.in",
 133                 want:        "testdata/huffman-shifts.%s.expect",
 134                 wantNoInput: "testdata/huffman-shifts.%s.expect-noinput",
 135                 tokens:      []token{0x31, 0x30, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x52400001, 0xd, 0xa, 0x32, 0x33, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7fc00001, 0x7f400001},
 136         },
 137         {
 138                 input:       "testdata/huffman-text-shift.in",
 139                 want:        "testdata/huffman-text-shift.%s.expect",
 140                 wantNoInput: "testdata/huffman-text-shift.%s.expect-noinput",
 141                 tokens:      []token{0x2f, 0x2f, 0x43, 0x6f, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x32, 0x30, 0x30, 0x39, 0x54, 0x68, 0x47, 0x6f, 0x41, 0x75, 0x74, 0x68, 0x6f, 0x72, 0x2e, 0x41, 0x6c, 0x6c, 0x40800016, 0x72, 0x72, 0x76, 0x64, 0x2e, 0xd, 0xa, 0x2f, 0x2f, 0x55, 0x6f, 0x66, 0x74, 0x68, 0x69, 0x6f, 0x75, 0x72, 0x63, 0x63, 0x6f, 0x64, 0x69, 0x67, 0x6f, 0x76, 0x72, 0x6e, 0x64, 0x62, 0x79, 0x42, 0x53, 0x44, 0x2d, 0x74, 0x79, 0x6c, 0x40400020, 0x6c, 0x69, 0x63, 0x6e, 0x74, 0x68, 0x74, 0x63, 0x6e, 0x62, 0x66, 0x6f, 0x75, 0x6e, 0x64, 0x69, 0x6e, 0x74, 0x68, 0x4c, 0x49, 0x43, 0x45, 0x4e, 0x53, 0x45, 0x66, 0x69, 0x6c, 0x2e, 0xd, 0xa, 0xd, 0xa, 0x70, 0x63, 0x6b, 0x67, 0x6d, 0x69, 0x6e, 0x4040000a, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x22, 0x6f, 0x22, 0x4040000c, 0x66, 0x75, 0x6e, 0x63, 0x6d, 0x69, 0x6e, 0x28, 0x29, 0x7b, 0xd, 0xa, 0x9, 0x76, 0x72, 0x62, 0x3d, 0x6d, 0x6b, 0x28, 0x5b, 0x5d, 0x62, 0x79, 0x74, 0x2c, 0x36, 0x35, 0x35, 0x33, 0x35, 0x29, 0xd, 0xa, 0x9, 0x66, 0x2c, 0x5f, 0x3a, 0x3d, 0x6f, 0x2e, 0x43, 0x72, 0x74, 0x28, 0x22, 0x68, 0x75, 0x66, 0x66, 0x6d, 0x6e, 0x2d, 0x6e, 0x75, 0x6c, 0x6c, 0x2d, 0x6d, 0x78, 0x2e, 0x69, 0x6e, 0x22, 0x40800021, 0x2e, 0x57, 0x72, 0x69, 0x74, 0x28, 0x62, 0x29, 0xd, 0xa, 0x7d, 0xd, 0xa, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x58, 0x78, 0x79, 0x7a, 0x21, 0x22, 0x23, 0xc2, 0xa4, 0x25, 0x26, 0x2f, 0x3f, 0x22},
 142         },
 143         {
 144                 input:       "testdata/huffman-text.in",
 145                 want:        "testdata/huffman-text.%s.expect",
 146                 wantNoInput: "testdata/huffman-text.%s.expect-noinput",
 147                 tokens:      []token{0x2f, 0x2f, 0x20, 0x43, 0x6f, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x20, 0x32, 0x30, 0x30, 0x39, 0x20, 0x54, 0x68, 0x65, 0x20, 0x47, 0x6f, 0x20, 0x41, 0x75, 0x74, 0x68, 0x6f, 0x72, 0x73, 0x2e, 0x20, 0x41, 0x6c, 0x6c, 0x20, 0x4080001e, 0x73, 0x20, 0x72, 0x65, 0x73, 0x65, 0x72, 0x76, 0x65, 0x64, 0x2e, 0xd, 0xa, 0x2f, 0x2f, 0x20, 0x55, 0x73, 0x65, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x69, 0x73, 0x20, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x20, 0x63, 0x6f, 0x64, 0x65, 0x20, 0x69, 0x73, 0x20, 0x67, 0x6f, 0x76, 0x65, 0x72, 0x6e, 0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x61, 0x20, 0x42, 0x53, 0x44, 0x2d, 0x73, 0x74, 0x79, 0x6c, 0x65, 0x40800036, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x20, 0x74, 0x68, 0x61, 0x74, 0x20, 0x63, 0x61, 0x6e, 0x20, 0x62, 0x65, 0x20, 0x66, 0x6f, 0x75, 0x6e, 0x64, 0x20, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x4c, 0x49, 0x43, 0x45, 0x4e, 0x53, 0x45, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x2e, 0xd, 0xa, 0xd, 0xa, 0x70, 0x61, 0x63, 0x6b, 0x61, 0x67, 0x65, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x4040000f, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x22, 0x6f, 0x73, 0x22, 0x4040000e, 0x66, 0x75, 0x6e, 0x63, 0x4080001b, 0x28, 0x29, 0x20, 0x7b, 0xd, 0xa, 0x9, 0x76, 0x61, 0x72, 0x20, 0x62, 0x20, 0x3d, 0x20, 0x6d, 0x61, 0x6b, 0x65, 0x28, 0x5b, 0x5d, 0x62, 0x79, 0x74, 0x65, 0x2c, 0x20, 0x36, 0x35, 0x35, 0x33, 0x35, 0x29, 0xd, 0xa, 0x9, 0x66, 0x2c, 0x20, 0x5f, 0x20, 0x3a, 0x3d, 0x20, 0x6f, 0x73, 0x2e, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x28, 0x22, 0x68, 0x75, 0x66, 0x66, 0x6d, 0x61, 0x6e, 0x2d, 0x6e, 0x75, 0x6c, 0x6c, 0x2d, 0x6d, 0x61, 0x78, 0x2e, 0x69, 0x6e, 0x22, 0x4080002a, 0x2e, 0x57, 0x72, 0x69, 0x74, 0x65, 0x28, 0x62, 0x29, 0xd, 0xa, 0x7d, 0xd, 0xa},
 148         },
 149         {
 150                 input:       "testdata/huffman-zero.in",
 151                 want:        "testdata/huffman-zero.%s.expect",
 152                 wantNoInput: "testdata/huffman-zero.%s.expect-noinput",
 153                 tokens:      []token{0x30, ml, 0x4b800000},
 154         },
 155         {
 156                 input:       "",
 157                 want:        "",
 158                 wantNoInput: "testdata/null-long-match.%s.expect-noinput",
 159                 tokens:      []token{0x0, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 0x41400000},
 160         },
 161 }
 162
 163 // TestWriteBlock tests if the writeBlock encoding has changed.
 164 // To update the reference files use the "-update" flag on the test.
 165 func TestWriteBlock(t *testing.T) {
 166         for _, test := range writeBlockTests {
 167                 testBlock(t, test, "wb")
 168         }
 169 }
 170
 171 // TestWriteBlockDynamic tests if the writeBlockDynamic encoding has changed.
 172 // To update the reference files use the "-update" flag on the test.
 173 func TestWriteBlockDynamic(t *testing.T) {
 174         for _, test := range writeBlockTests {
 175                 testBlock(t, test, "dyn")
 176         }
 177 }
 178
 179 // testBlock tests a block against its references,
 180 // or regenerate the references, if "-update" flag is set.
 181 func testBlock(t *testing.T, test huffTest, ttype string) {
 182         if test.want != "" {
 183                 test.want = fmt.Sprintf(test.want, ttype)
 184         }
 185         test.wantNoInput = fmt.Sprintf(test.wantNoInput, ttype)
 186         if *update {
 187                 if test.input != "" {
 188                         t.Logf("Updating %q", test.want)
 189                         input, err := ioutil.ReadFile(test.input)
 190                         if err != nil {
 191                                 t.Error(err)
 192                                 return
 193                         }
 194
 195                         f, err := os.Create(test.want)
 196                         if err != nil {
 197                                 t.Error(err)
 198                                 return
 199                         }
 200                         defer f.Close()
 201                         bw := newHuffmanBitWriter(f)
 202                         writeToType(t, ttype, bw, test.tokens, input)
 203                 }
 204
 205                 t.Logf("Updating %q", test.wantNoInput)
 206                 f, err := os.Create(test.wantNoInput)
 207                 if err != nil {
 208                         t.Error(err)
 209                         return
 210                 }
 211                 defer f.Close()
 212                 bw := newHuffmanBitWriter(f)
 213                 writeToType(t, ttype, bw, test.tokens, nil)
 214                 return
 215         }
 216
 217         if test.input != "" {
 218                 t.Logf("Testing %q", test.want)
 219                 input, err := ioutil.ReadFile(test.input)
 220                 if err != nil {
 221                         t.Error(err)
 222                         return
 223                 }
 224                 want, err := ioutil.ReadFile(test.want)
 225                 if err != nil {
 226                         t.Error(err)
 227                         return
 228                 }
 229                 var buf bytes.Buffer
 230                 bw := newHuffmanBitWriter(&buf)
 231                 writeToType(t, ttype, bw, test.tokens, input)
 232
 233                 got := buf.Bytes()
 234                 if !bytes.Equal(got, want) {
 235                         t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".got")
 236                         if err := ioutil.WriteFile(test.want+".got", got, 0666); err != nil {
 237                                 t.Error(err)
 238                         }
 239                 }
 240                 t.Log("Output ok")
 241
 242                 // Test if the writer produces the same output after reset.
 243                 buf.Reset()
 244                 bw.reset(&buf)
 245                 writeToType(t, ttype, bw, test.tokens, input)
 246                 bw.flush()
 247                 got = buf.Bytes()
 248                 if !bytes.Equal(got, want) {
 249                         t.Errorf("reset: writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".reset.got")
 250                         if err := ioutil.WriteFile(test.want+".reset.got", got, 0666); err != nil {
 251                                 t.Error(err)
 252                         }
 253                         return
 254                 }
 255                 t.Log("Reset ok")
 256                 testWriterEOF(t, "wb", test, true)
 257         }
 258         t.Logf("Testing %q", test.wantNoInput)
 259         wantNI, err := ioutil.ReadFile(test.wantNoInput)
 260         if err != nil {
 261                 t.Error(err)
 262                 return
 263         }
 264         var buf bytes.Buffer
 265         bw := newHuffmanBitWriter(&buf)
 266         writeToType(t, ttype, bw, test.tokens, nil)
 267
 268         got := buf.Bytes()
 269         if !bytes.Equal(got, wantNI) {
 270                 t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.wantNoInput, test.wantNoInput+".got")
 271                 if err := ioutil.WriteFile(test.want+".got", got, 0666); err != nil {
 272                         t.Error(err)
 273                 }
 274         } else if got[0]&1 == 1 {
 275                 t.Error("got unexpected EOF")
 276                 return
 277         }
 278
 279         t.Log("Output ok")
 280
 281         // Test if the writer produces the same output after reset.
 282         buf.Reset()
 283         bw.reset(&buf)
 284         writeToType(t, ttype, bw, test.tokens, nil)
 285         bw.flush()
 286         got = buf.Bytes()
 287         if !bytes.Equal(got, wantNI) {
 288                 t.Errorf("reset: writeBlock did not yield expected result for file %q without input. See %q", test.want, test.want+".reset.got")
 289                 if err := ioutil.WriteFile(test.want+".reset.got", got, 0666); err != nil {
 290                         t.Error(err)
 291                 }
 292                 return
 293         }
 294         t.Log("Reset ok")
 295         testWriterEOF(t, "wb", test, false)
 296 }
 297
 298 func writeToType(t *testing.T, ttype string, bw *huffmanBitWriter, tok []token, input []byte) {
 299         switch ttype {
 300         case "wb":
 301                 bw.writeBlock(tok, false, input)
 302         case "dyn":
 303                 bw.writeBlockDynamic(tok, false, input)
 304         default:
 305                 panic("unknown test type")
 306         }
 307
 308         if bw.err != nil {
 309                 t.Error(bw.err)
 310                 return
 311         }
 312
 313         bw.flush()
 314         if bw.err != nil {
 315                 t.Error(bw.err)
 316                 return
 317         }
 318 }
 319
 320 // testWriterEOF tests if the written block contains an EOF marker.
 321 func testWriterEOF(t *testing.T, ttype string, test huffTest, useInput bool) {
 322         if useInput && test.input == "" {
 323                 return
 324         }
 325         var input []byte
 326         if useInput {
 327                 var err error
 328                 input, err = ioutil.ReadFile(test.input)
 329                 if err != nil {
 330                         t.Error(err)
 331                         return
 332                 }
 333         }
 334         var buf bytes.Buffer
 335         bw := newHuffmanBitWriter(&buf)
 336         switch ttype {
 337         case "wb":
 338                 bw.writeBlock(test.tokens, true, input)
 339         case "dyn":
 340                 bw.writeBlockDynamic(test.tokens, true, input)
 341         case "huff":
 342                 bw.writeBlockHuff(true, input)
 343         default:
 344                 panic("unknown test type")
 345         }
 346         if bw.err != nil {
 347                 t.Error(bw.err)
 348                 return
 349         }
 350
 351         bw.flush()
 352         if bw.err != nil {
 353                 t.Error(bw.err)
 354                 return
 355         }
 356         b := buf.Bytes()
 357         if len(b) == 0 {
 358                 t.Error("no output received")
 359                 return
 360         }
 361         if b[0]&1 != 1 {
 362                 t.Errorf("block not marked with EOF for input %q", test.input)
 363                 return
 364         }
 365         t.Log("EOF ok")
 366 }