github.com/mh-cbon/go@v0.0.0-20160603070303-9e112a3fe4c0/src/compress/flate/huffman_bit_writer_test.go (about) 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, 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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, 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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 }