libgo/go/compress/bzip2/bzip2_test.go

   1 // Copyright 2011 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 bzip2
   6
   7 import (
   8         "bytes"
   9         "encoding/base64"
  10         "encoding/hex"
  11         "io"
  12         "io/ioutil"
  13         "testing"
  14 )
  15
  16 func TestBitReader(t *testing.T) {
  17         buf := bytes.NewReader([]byte{0xaa})
  18         br := newBitReader(buf)
  19         if n := br.ReadBits(1); n != 1 {
  20                 t.Errorf("read 1 wrong")
  21         }
  22         if n := br.ReadBits(1); n != 0 {
  23                 t.Errorf("read 2 wrong")
  24         }
  25         if n := br.ReadBits(1); n != 1 {
  26                 t.Errorf("read 3 wrong")
  27         }
  28         if n := br.ReadBits(1); n != 0 {
  29                 t.Errorf("read 4 wrong")
  30         }
  31 }
  32
  33 func TestBitReaderLarge(t *testing.T) {
  34         buf := bytes.NewReader([]byte{0x12, 0x34, 0x56, 0x78})
  35         br := newBitReader(buf)
  36         if n := br.ReadBits(32); n != 0x12345678 {
  37                 t.Errorf("got: %x want: %x", n, 0x12345678)
  38         }
  39 }
  40
  41 func readerFromHex(s string) io.Reader {
  42         data, err := hex.DecodeString(s)
  43         if err != nil {
  44                 panic("readerFromHex: bad input")
  45         }
  46         return bytes.NewReader(data)
  47 }
  48
  49 func decompressHex(s string) (out []byte, err error) {
  50         r := NewReader(readerFromHex(s))
  51         return ioutil.ReadAll(r)
  52 }
  53
  54 func TestHelloWorldBZ2(t *testing.T) {
  55         out, err := decompressHex(helloWorldBZ2Hex)
  56         if err != nil {
  57                 t.Errorf("error from Read: %s", err)
  58                 return
  59         }
  60
  61         if !bytes.Equal(helloWorld, out) {
  62                 t.Errorf("got %x, want %x", out, helloWorld)
  63         }
  64 }
  65
  66 func TestConcat(t *testing.T) {
  67         out, err := decompressHex(helloWorldBZ2Hex + helloWorldBZ2Hex)
  68         if err != nil {
  69                 t.Errorf("error from Read: %s", err)
  70                 return
  71         }
  72
  73         hello2 := bytes.Repeat(helloWorld, 2)
  74         if !bytes.Equal(hello2, out) {
  75                 t.Errorf("got %x, want %x", out, hello2)
  76         }
  77 }
  78
  79 func testZeros(t *testing.T, inHex string, n int) {
  80         out, err := decompressHex(inHex)
  81         if err != nil {
  82                 t.Errorf("error from Read: %s", err)
  83                 return
  84         }
  85
  86         expected := make([]byte, n)
  87
  88         if !bytes.Equal(expected, out) {
  89                 allZeros := true
  90                 for _, b := range out {
  91                         if b != 0 {
  92                                 allZeros = false
  93                                 break
  94                         }
  95                 }
  96                 t.Errorf("incorrect result, got %d bytes (allZeros: %t)", len(out), allZeros)
  97         }
  98 }
  99
 100 func Test32Zeros(t *testing.T) {
 101         testZeros(t, thirtyTwoZerosBZ2Hex, 32)
 102 }
 103
 104 func Test1MBZeros(t *testing.T) {
 105         testZeros(t, oneMBZerosBZ2Hex, 1024*1024)
 106 }
 107
 108 func testRandomData(t *testing.T, compressedHex, uncompressedHex string) {
 109         out, err := decompressHex(compressedHex)
 110         if err != nil {
 111                 t.Errorf("error from Read: %s", err)
 112                 return
 113         }
 114
 115         expected, _ := hex.DecodeString(uncompressedHex)
 116
 117         if !bytes.Equal(out, expected) {
 118                 t.Errorf("incorrect result\ngot:  %x\nwant: %x", out, expected)
 119         }
 120 }
 121
 122 func TestRandomData1(t *testing.T) {
 123         testRandomData(t, randBZ2Hex, randHex)
 124 }
 125
 126 func TestRandomData2(t *testing.T) {
 127         // This test involves several repeated bytes in the output, but they
 128         // should trigger RLE decoding.
 129         testRandomData(t, rand2BZ2Hex, rand2Hex)
 130 }
 131
 132 func TestRandomData3(t *testing.T) {
 133         // This test uses the full range of symbols.
 134         testRandomData(t, rand3BZ2Hex, rand3Hex)
 135 }
 136
 137 func Test1MBSawtooth(t *testing.T) {
 138         out, err := decompressHex(oneMBSawtoothBZ2Hex)
 139         if err != nil {
 140                 t.Errorf("error from Read: %s", err)
 141                 return
 142         }
 143
 144         expected := make([]byte, 1024*1024)
 145
 146         for i := range expected {
 147                 expected[i] = byte(i)
 148         }
 149
 150         if !bytes.Equal(out, expected) {
 151                 t.Error("incorrect result")
 152         }
 153 }
 154
 155 const helloWorldBZ2Hex = "425a68393141592653594eece83600000251800010400006449080200031064c4101a7a9a580bb9431f8bb9229c28482776741b0"
 156
 157 var helloWorld = []byte("hello world\n")
 158
 159 const thirtyTwoZerosBZ2Hex = "425a6839314159265359b5aa5098000000600040000004200021008283177245385090b5aa5098"
 160 const oneMBZerosBZ2Hex = "425a683931415926535938571ce50008084000c0040008200030cc0529a60806c4201e2ee48a70a12070ae39ca"
 161
 162 const randBZ2Hex = "425a6839314159265359905d990d0001957fffffffffffafffffffffffffffffbfff6fffdfffffffffffffffffffffffffffffc002b6dd75676ed5b77720098320d11a64626981323d4da47a83131a13d09e8040f534cd4f4d27a464d193008cd09804601347a980026350c9886234d36864193d1351b44c136919e90340d26127a4cd264c32023009898981310c0344c340027a8303427a99a04c00003534c230d034f5006468d268cf54d36a3009a69a62626261311b40026013d34201a6934c9a604c98ca6c8460989fa9346234d30d3469a2604fd4131a7aa6d0046043d4c62098479269e89e835190d018d4c046001a11e801a0264792321932308c43a130688c260d46686804cd01a9e80981193684c6a68c00000004c4c20c04627a4c0000260003400d04c0681a01334026009a6f48041466132581ec5212b081d96b0effc16543e2228b052fcd30f2567ee8d970e0f10aabca68dd8270591c376cfc1baae0dba00aaff2d6caf6b211322c997cc18eaee5927f75185336bf907021324c71626c1dd20e22b9b0977f05d0f901eaa51db9fbaf7c603b4c87bc82890e6dd7e61d0079e27ec050dd788fd958152061cd01e222f9547cb9efc465d775b6fc98bac7d387bffd151ae09dadf19494f7a638e2eae58e550faba5fe6820ea520eb986096de4e527d80def3ba625e71fbefdcf7e7844e0a25d29b52dcd1344fca083737d42692aab38d230485f3c8ed54c2ed31f15cf0270c8143765b10b92157233fa1dfe0d7ce8ffe70b8b8f7250071701dfe9f1c94de362c9031455951c93eb098a6b50ee45c6131fefc3b6f9643e21f4adc59497138e246f5c57d834aa67c4f10d8bd8b3908d8130dd7388409c299a268eab3664fa4907c5c31574874bd8d388a4ab22b339660804e53e1b8d05867d40e3082560608d35d5d2c6054e8bab23da28f61f83efd41d25529ad6ea15fb50505cacfabb0902166427354ca3830a2c8415f21b19e592690fbe447020d685a4bcd16ecc4ff1a1c0e572627d0ef6265c008a43fc243240541061ed7840606be466d1c0dac2c53250ed567507d926c844154560d631960c65e15157829b2c7f16859f111a3a8cb72bf24ffa57a680c3be67b1be67c8dd8aea73ac2437a78df5b686d427080ebc01bd30b71a49f6ea31dc0f08e4849e38face96717690239538bc08b6cc5aa8d467cb9c36aa83d40ac7e58bddbfa185b22065e89a86c0145569d9e23726651aec49e31588d70f40fe9a4449dcf4f89eac220171e9c938e803dc195679651004b79ad33cc0c13aeeba5941b33ffeeb8fbe16e76c7811445c67b4269c90479433ddf9e8ed1d00c166b6c17217fb22c3ef1b0c1c7e28e185446a111c37f1ea6c07a59fbcc6546ecc6968d36ba58bc5489a5640647e426b0c39350cb6f07d5dc7a717648c4ec7f841467597ae1f65f408fd2d9940a4b1b860b3c9ae351dcae0b4425f7e8538710f2e40b7f70d13b51ac05ccc6ecda8264a88cad2d721d18132a9b9110a9e759c2483c77dcefc7e464ec88588174cb0c9abff93230ea0bed8decdd8ed8bfe2b5df0a253803678df04fab44c03b9ab7cc97d6e6d6fd0c4c840ce0efc498436f453bbb181603459471f2b588724592b222ec990614db530e10cadd84705621cfdd9261fa44a5f5806a2d74b575056b3c915255c65678f9c16e6dc00a99180fef1a840aff0e842ac02731080cc92782538360a60a727991013984da4fad95f79d5030677b7528d076b2483685fca4429edf804682fdc110dfc2f7c30e23e20a72e039108a0ad6fdee2f76985a4b4be4f5afc6101bf9d5042b657a05dc914e1424241766434"
 163 const randHex = "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"
 164
 165 const oneMBSawtoothBZ2Hex = "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"
 166
 167 const rand2BZ2Hex = "425a6839314159265359d992d0f60000137dfe84020310091c1e280e100e042801099210094806c0110002e70806402000546034000034000000f2830000032000d3403264049270eb7a9280d308ca06ad28f6981bee1bf8160727c7364510d73a1e123083421b63f031f63993a0f40051fbf177245385090d992d0f60"
 168 const rand2Hex = "92d5652616ac444a4a04af1a8a3964aca0450d43d6cf233bd03233f4ba92f8719e6c2a2bd4f5f88db07ecd0da3a33b263483db9b2c158786ad6363be35d17335ba"
 169
 170 const rand3BZ2Hex = "425a68393141592653593be669d00000327ffffffffffffffffffffffffffffffffffff7ffffffffffffffffffffffffffffffc002b3b2b1b6e2bae400004c00132300004c0d268c004c08c0130026001a008683234c0684c34008c230261a04c0260064d07a8d00034000d27a1268c9931a8d327a3427a41faa69ea0da264c1a34219326869b51b49a6469a3268c689fa53269a62794687a9a68f5189994c9e487a8f534fd49a3d34043629e8c93d04da4f4648d30d4f44d3234c4d3023d0840680984d309934c234d3131a000640984f536a6132601300130130c8d00d04d1841ea7a8d31a02609b40023460010c01a34d4c1a0d04d3069306810034d0d0d4c0046130d034d0131a9a64d321804c68003400098344c13000991808c0001a00000000098004d3d4da4604c47a13012140aadf8d673c922c607ef6212a8c0403adea4b28aee578900e653b9cdeb8d11e6b838815f3ebaad5a01c5408d84a332170aff8734d4e06612d3c2889f31925fb89e33561f5100ae89b1f7047102e729373d3667e58d73aaa80fa7be368a1cc2dadd81d81ec8e1b504bd772ca31d03649269b01ceddaca07bf3d4eba24de141be3f86f93601e03714c0f64654671684f9f9528626fd4e1b76753dc0c54b842486b8d59d8ab314e86ca818e7a1f079463cbbd70d9b79b283c7edc419406311022e4be98c2c1374df9cdde2d008ce1d00e5f06ad1024baf555631f70831fc1023034e62be7c4bcb648caf276963ffa20e96bb50377fe1c113da0db4625b50741c35a058edb009c6ee5dbf93b8a6b060eec568180e8db791b82aab96cbf4326ca98361461379425ba8dcc347be670bdba7641883e5526ae3d833f6e9cb9bac9557747c79e206151072f7f0071dff3880411846f66bf4075c7462f302b53cb3400a74cf35652ad5641ed33572fd54e7ed7f85f58a0acba89327e7c6be5c58cb71528b99df2431f1d0358f8d28d81d95292da631fb06701decabb205fac59ff0fb1df536afc681eece6ea658c4d9eaa45f1342aa1ff70bdaff2ddaf25ec88c22f12829a0553db1ec2505554cb17d7b282e213a5a2aa30431ded2bce665bb199d023840832fedb2c0c350a27291407ff77440792872137df281592e82076a05c64c345ffb058c64f7f7c207ef78420b7010520610f17e302cc4dfcfaef72a0ed091aab4b541eb0531bbe941ca2f792bf7b31ca6162882b68054a8470115bc2c19f2df2023f7800432b39b04d3a304e8085ba3f1f0ca5b1ba4d38d339e6084de979cdea6d0e244c6c9fa0366bd890621e3d30846f5e8497e21597b8f29bbf52c961a485dfbea647600da0fc1f25ce4d203a8352ece310c39073525044e7ac46acf2ed9120bae1b4f6f02364abfe343f80b290983160c103557af1c68416480d024cc31b6c06cfec011456f1e95c420a12b48b1c3fe220c2879a982fb099948ac440db844b9a112a5188c7783fd3b19593290785f908d95c9db4b280bafe89c1313aeec24772046d9bc089645f0d182a21184e143823c5f52de50e5d7e98d3d7ab56f5413bbccd1415c9bcff707def475b643fb7f29842582104d4cc1dbaaca8f10a2f44273c339e0984f2b1e06ab2f0771db01fafa8142298345f3196f23e5847bda024034b6f59b11c29e981c881456e40d211929fd4f766200258aad8212016322bd5c605790dcfdf1bd2a93d99c9b8f498722d311d7eae7ff420496a31804c55f4759a7b13aaaf5f7ce006c3a8a998897d5e0a504398c2b627852545baf440798bcc5cc049357cf3f17d9771e4528a1af3d77dc794a11346e1bdf5efe37a405b127b4c43b616d61fbc5dc914e14240ef99a7400"
 171 const rand3Hex = "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"
 172
 173 const (
 174         digits = iota
 175         twain
 176 )
 177
 178 var testfiles = []string{
 179         // Digits is the digits of the irrational number e. Its decimal representation
 180         // does not repeat, but there are only 10 possible digits, so it should be
 181         // reasonably compressible.
 182         digits: "testdata/e.txt.bz2",
 183         // Twain is Project Gutenberg's edition of Mark Twain's classic English novel.
 184         twain: "testdata/Mark.Twain-Tom.Sawyer.txt.bz2",
 185 }
 186
 187 func benchmarkDecode(b *testing.B, testfile int) {
 188         compressed, err := ioutil.ReadFile(testfiles[testfile])
 189         if err != nil {
 190                 b.Fatal(err)
 191         }
 192         b.SetBytes(int64(len(compressed)))
 193         for i := 0; i < b.N; i++ {
 194                 r := bytes.NewReader(compressed)
 195                 io.Copy(ioutil.Discard, NewReader(r))
 196         }
 197 }
 198
 199 func BenchmarkDecodeDigits(b *testing.B) { benchmarkDecode(b, digits) }
 200 func BenchmarkDecodeTwain(b *testing.B)  { benchmarkDecode(b, twain) }
 201
 202 func TestBufferOverrun(t *testing.T) {
 203         // Tests https://code.google.com/p/go/issues/detail?id=5747.
 204         buffer := bytes.NewReader([]byte(bufferOverrunBase64))
 205         decoder := base64.NewDecoder(base64.StdEncoding, buffer)
 206         decompressor := NewReader(decoder)
 207         // This shouldn't panic.
 208         ioutil.ReadAll(decompressor)
 209 }
 210
 211 func TestOutOfRangeSelector(t *testing.T) {
 212         // Tests https://code.google.com/p/go/issues/detail?id=8363.
 213         buffer := bytes.NewReader(outOfRangeSelector)
 214         decompressor := NewReader(buffer)
 215         // This shouldn't panic.
 216         ioutil.ReadAll(decompressor)
 217 }
 218
 219 func TestMTF(t *testing.T) {
 220         mtf := newMTFDecoderWithRange(5)
 221
 222         // 0 1 2 3 4
 223         expect := byte(1)
 224         x := mtf.Decode(1)
 225         if x != expect {
 226                 t.Errorf("expected %v, got %v", expect, x)
 227         }
 228
 229         // 1 0 2 3 4
 230         x = mtf.Decode(0)
 231         if x != expect {
 232                 t.Errorf("expected %v, got %v", expect, x)
 233         }
 234
 235         // 1 0 2 3 4
 236         expect = byte(0)
 237         x = mtf.Decode(1)
 238         if x != expect {
 239                 t.Errorf("expected %v, got %v", expect, x)
 240         }
 241
 242         // 0 1 2 3 4
 243         expect = byte(4)
 244         x = mtf.Decode(4)
 245         if x != expect {
 246                 t.Errorf("expected %v, got %v", expect, x)
 247         }
 248
 249         // 4 0 1 2 3
 250         expect = byte(0)
 251         x = mtf.Decode(1)
 252         if x != expect {
 253                 t.Errorf("expected %v, got %v", expect, x)
 254         }
 255 }
 256
 257 var bufferOverrunBase64 string = `
 258 QlpoNTFBWSZTWTzyiGcACMP/////////////////////////////////3/7f3///
 259 ////4N/fCZODak2Xo44GIHZgkGzDRbFAuwAAKoFV7T6AO6qwA6APb6s2rOoAkAAD
 260 oACUoDtndh0iQAPkAAAAaPWihQoCgr5t97Obju21ChQB0NBm3RbA7apXrRoBooAA
 261 AhA+IAHWl2Us3O7t9yieb3udvd76+4+fd33nd3HO1bVvfcGRne6+3vfPvfc++995
 262 w7k973eJhasLVec970tzDNXdX28LoPXZ3H3K9z0s5ufWAfes49d5594c3dUYtI+2
 263 +h1dvtpRa+uvrVEAG9bl893RVEN7cWvroSqWjPMGgAQi7Gq8TJSgKKdjKFBIB9Ae
 264 LqWxleu715eXe7ml9e5098Z6G1vr7t1QZ6ot76YzPd3j7333t2ql2Chm7XrA9ICQ
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 266 bKUeipEqwc93EdhhTwmQpOhhesC9iqDSPNTWYNSnUtBdm1nsA0nqqNd7OWwDXtFL
 267 ONmmA6Ubke26I9UblvWIPR5VOWOnctai443URunnDy77uVC59OfRvezlDu33Z7Ly
 268 3NNuuHW63088xu3t3NHZhkZbG7tXRlj00qOtbaXTJUUdspTbABR9R6EUwQAEAAAA
 269 EMEwRpoAAAABMmhoAAjBNNAaCMhponpoGpgJpk9TEyp6niGKZkAaAEfqMQ09U80p
 270 +pMGSCKngIAAAAgAAg0AAJhGgABGCEaaTyTKeNI1PE0wkj01GajMSNPSZGnqbU9T
 271 anlPUNAHqGQ0DQAMg9TamgAAYRU/IAAICAmjQJgjQBMEwp5DTSaaYmhTeqfplPID
 272 U1T9TynoU82pT1NPU/VP0j1NHqRpk9TTR7SnqaNNGmmQAaAD1Aeo0PSAAAAaaBiK
 273 eBAQBGgIABGQA0AmBNNBoaAgaJmpglPEyYap6npiTT0agGjJjUaaDTQAAAAAAM1A
 274 9QAaAAAADU8iEAQAEyAJk0NNNJgIZTJ5E00YSemiaZNGm1MpGNJ+lPU9qm9U2RDM
 275 oY0EzJB6h6nqDID1NMBDDRpo1AGNAjCMmhkMgaYSJIgAAAQyAAEyBoATECCNhTT0
 276 U/IZAmCM1DSTxkzUE8p6NDaGiZGJqntTFHvUyU9qPQp7Kn5GgKNPU9QAGg9QAAA3
 277 wz0Pk/g/m/m9P9H4vxv2+dH3gCS8nhbbbbbYxtgNsBsG0m2MbG0NNtsbYNsaY0wb
 278 bBibGmm22mxptNpsaGNDTY02JsG0MY0xg2MaYNNDbGwG0L5vsK/F9DO+EAA447Kq
 279 p7Wdf6Y+5c20T7DfHyMXIzRKrZexw72uiQI+y55vOe52xpqbCLC2uR20JdER7Zvr
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 285 E3+ND8YhN1HSriIxRE/6uFyMv6/oC6Elarw3aHMMqHJkGiiz6tejmvnYLQa+Qm6G
 286 deZ7jXTZV6NlpocgDnRdimS06bTYSkvPAL/xoWNLkX6N6VljU0dfKSBmm2uZE/xu
 287 sutQ1EdP7GdjhglIq4xlOFUFEQpmX+xx7R8y6c0GSAaqusOjNZwxZRudOvmXm1tZ
 288 T+YnbeB2ir9eiHNrtJNSLD/J/WDyuQpwBUtLKo0krccY/wIILP7f86teb9Z/9oyz
 289 OX05qEWbObfhpRw+9+rCvp/35ML8KX3aHaI0n+tudbFRsV5FLW+Oa8ruLN4peyVL
 290 DWjTHrXNthq/s7zAJYMeFJZkZt5mT9rfpH+5g3nc+piOSZ+J5nHtOnKI7Ff8Xl+j
 291 0t76XTNucCHQ6whav1OHdF53TY5wuv5OzvrdnxoId8fTyUvERr0ERINu/8XxZZ5f
 292 B5/kTZ8bBO0wv54Jp+ED/GQI8lZHzIQCP3vfQhwnCTj9TvITic7P4mYLDbH3fyzR
 293 i+6EajCcpXLWSGf+ZXkOrWspDWDhXtEKas0v3UqWksqgY1rTj45krX4KihN+daXs
 294 pZl5WPlta5p06CX6Xm2SfzqkMw12/3ix1bpnnZ+kFeBNX7A+E9zzG6OZaN78GOpl
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 296 djfq7zWp7m5w+hzfv+Ly8O7oet5Vvd8/wQvO7qzOZ2vjf9X8Tj8PnMb/nc/nKqRR
 297 +ml4UEhOOwfCeJEEI109CMYSh91iAJqPjMyH6KjrPD7W25llZVcREYNCTg6htbQt
 298 M38wYoquCWP6tdKYlVIv14xTNUeUf4El/FunCf6csZkmv+9tfWx7t59wuKIa3saU
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 300 SL3haaw351LXWQ1XOsv1SmH3v6ymuxEpPPnEDmBELaTYsvvMIWJsmPZFFww++Kd7
 301 s/Jo0JFeUU7uNtI+gVosAIpVVuWfI/9tOIycz7I5Z7zjV+NR2OuZbYtW5F08KX4o
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 303 WK9mMMPebepNevmLjjo/QWoM968Sjv7ldlPS5AinHcXwsFv6dmmh8lJt7UOJWoKu
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 314 7/T8/sdTm9Tn8nELvedyhydLlPPTScINdXyLIq9wgIJr4fWPbp9ZhFh/56fdSgOG
 315 HDXg+gkXsN2Rddr4HQ5P3u+RhLzmSjhzoqY5EsPC4QvRlX9JXjB84rPV5USR66qa
 316 /kjw4156GJnzoXtydKJE53t6PHfZWO+3ujsfI6iAdshc7OFzGXiZB9PtItKodhYq
 317 nABkTKdcpu4+TOpf9h5piX5slsaBjkeTnj/Ba02ilboQfcDVigxrYn/iTH5ySWUW
 318 /lHtg78s5UZM8sErwhNe3N3w+6ZOMnU+5i86/xFNtqZfDdXTGy1H3PzGbdtZXYT+
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 335 CaMEyQnqZoaaRtRtJpppppoDaTR6hpphGh6mmgHpMQBpkGTTEAAaAAAA00AZDag0
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 409 `
 410
 411 var outOfRangeSelector = []byte{
 412         0x42, 0x5a, 0x68, 0x39, 0x31, 0x41, 0x59, 0x26,
 413         0x53, 0x59, 0x4e, 0xec, 0xe8, 0x36, 0x00, 0x00,
 414         0x02, 0x51, 0x80, 0x00, 0x10, 0x40, 0x00, 0x06,
 415         0x44, 0x90, 0x80, 0x20, 0x00, 0x31, 0x06, 0x4c,
 416         0x41, 0x01, 0xa7, 0xa9, 0xa5, 0x80, 0xbb, 0x94,
 417         0x31, 0x17, 0x72, 0x45, 0x38, 0x50, 0x90, 0x00,
 418         0x00, 0x00, 0x00,
 419 }