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 5package flate 6 7import ( 8 "bytes" 9 "flag" 10 "fmt" 11 "os" 12 "path/filepath" 13 "strings" 14 "testing" 15) 16 17var update = flag.Bool("update", false, "update reference files") 18 19// TestBlockHuff tests huffman encoding against reference files 20// to detect possible regressions. 21// If encoding/bit allocation changes you can regenerate these files 22// by using the -update flag. 23func TestBlockHuff(t *testing.T) { 24 // determine input files 25 match, err := filepath.Glob("testdata/huffman-*.in") 26 if err != nil { 27 t.Fatal(err) 28 } 29 30 for _, in := range match { 31 out := in // for files where input and output are identical 32 if strings.HasSuffix(in, ".in") { 33 out = in[:len(in)-len(".in")] + ".golden" 34 } 35 testBlockHuff(t, in, out) 36 } 37} 38 39func testBlockHuff(t *testing.T, in, out string) { 40 all, err := os.ReadFile(in) 41 if err != nil { 42 t.Error(err) 43 return 44 } 45 var buf bytes.Buffer 46 bw := newHuffmanBitWriter(&buf) 47 bw.writeBlockHuff(false, all) 48 bw.flush() 49 got := buf.Bytes() 50 51 want, err := os.ReadFile(out) 52 if err != nil && !*update { 53 t.Error(err) 54 return 55 } 56 57 t.Logf("Testing %q", in) 58 if !bytes.Equal(got, want) { 59 if *update { 60 if in != out { 61 t.Logf("Updating %q", out) 62 if err := os.WriteFile(out, got, 0666); err != nil { 63 t.Error(err) 64 } 65 return 66 } 67 // in == out: don't accidentally destroy input 68 t.Errorf("WARNING: -update did not rewrite input file %s", in) 69 } 70 71 t.Errorf("%q != %q (see %q)", in, out, in+".got") 72 if err := os.WriteFile(in+".got", got, 0666); err != nil { 73 t.Error(err) 74 } 75 return 76 } 77 t.Log("Output ok") 78 79 // Test if the writer produces the same output after reset. 80 buf.Reset() 81 bw.reset(&buf) 82 bw.writeBlockHuff(false, all) 83 bw.flush() 84 got = buf.Bytes() 85 if !bytes.Equal(got, want) { 86 t.Errorf("after reset %q != %q (see %q)", in, out, in+".reset.got") 87 if err := os.WriteFile(in+".reset.got", got, 0666); err != nil { 88 t.Error(err) 89 } 90 return 91 } 92 t.Log("Reset ok") 93 testWriterEOF(t, "huff", huffTest{input: in}, true) 94} 95 96type huffTest struct { 97 tokens []token 98 input string // File name of input data matching the tokens. 99 want string // File name of data with the expected output with input available. 100 wantNoInput string // File name of the expected output when no input is available. 101} 102 103const ml = 0x7fc00000 // Maximum length token. Used to reduce the size of writeBlockTests 104 105var writeBlockTests = []huffTest{ 106 { 107 input: "testdata/huffman-null-max.in", 108 want: "testdata/huffman-null-max.%s.expect", 109 wantNoInput: "testdata/huffman-null-max.%s.expect-noinput", 110 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, 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0x7fc00001, 0x7fc00001, 0x7f400001}, 135 }, 136 { 137 input: "testdata/huffman-text-shift.in", 138 want: "testdata/huffman-text-shift.%s.expect", 139 wantNoInput: "testdata/huffman-text-shift.%s.expect-noinput", 140 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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ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 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}, 159 }, 160} 161 162// TestWriteBlock tests if the writeBlock encoding has changed. 163// To update the reference files use the "-update" flag on the test. 164func TestWriteBlock(t *testing.T) { 165 for _, test := range writeBlockTests { 166 testBlock(t, test, "wb") 167 } 168} 169 170// TestWriteBlockDynamic tests if the writeBlockDynamic encoding has changed. 171// To update the reference files use the "-update" flag on the test. 172func TestWriteBlockDynamic(t *testing.T) { 173 for _, test := range writeBlockTests { 174 testBlock(t, test, "dyn") 175 } 176} 177 178// testBlock tests a block against its references, 179// or regenerate the references, if "-update" flag is set. 180func testBlock(t *testing.T, test huffTest, ttype string) { 181 if test.want != "" { 182 test.want = fmt.Sprintf(test.want, ttype) 183 } 184 test.wantNoInput = fmt.Sprintf(test.wantNoInput, ttype) 185 if *update { 186 if test.input != "" { 187 t.Logf("Updating %q", test.want) 188 input, err := os.ReadFile(test.input) 189 if err != nil { 190 t.Error(err) 191 return 192 } 193 194 f, err := os.Create(test.want) 195 if err != nil { 196 t.Error(err) 197 return 198 } 199 defer f.Close() 200 bw := newHuffmanBitWriter(f) 201 writeToType(t, ttype, bw, test.tokens, input) 202 } 203 204 t.Logf("Updating %q", test.wantNoInput) 205 f, err := os.Create(test.wantNoInput) 206 if err != nil { 207 t.Error(err) 208 return 209 } 210 defer f.Close() 211 bw := newHuffmanBitWriter(f) 212 writeToType(t, ttype, bw, test.tokens, nil) 213 return 214 } 215 216 if test.input != "" { 217 t.Logf("Testing %q", test.want) 218 input, err := os.ReadFile(test.input) 219 if err != nil { 220 t.Error(err) 221 return 222 } 223 want, err := os.ReadFile(test.want) 224 if err != nil { 225 t.Error(err) 226 return 227 } 228 var buf bytes.Buffer 229 bw := newHuffmanBitWriter(&buf) 230 writeToType(t, ttype, bw, test.tokens, input) 231 232 got := buf.Bytes() 233 if !bytes.Equal(got, want) { 234 t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".got") 235 if err := os.WriteFile(test.want+".got", got, 0666); err != nil { 236 t.Error(err) 237 } 238 } 239 t.Log("Output ok") 240 241 // Test if the writer produces the same output after reset. 242 buf.Reset() 243 bw.reset(&buf) 244 writeToType(t, ttype, bw, test.tokens, input) 245 bw.flush() 246 got = buf.Bytes() 247 if !bytes.Equal(got, want) { 248 t.Errorf("reset: writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".reset.got") 249 if err := os.WriteFile(test.want+".reset.got", got, 0666); err != nil { 250 t.Error(err) 251 } 252 return 253 } 254 t.Log("Reset ok") 255 testWriterEOF(t, "wb", test, true) 256 } 257 t.Logf("Testing %q", test.wantNoInput) 258 wantNI, err := os.ReadFile(test.wantNoInput) 259 if err != nil { 260 t.Error(err) 261 return 262 } 263 var buf bytes.Buffer 264 bw := newHuffmanBitWriter(&buf) 265 writeToType(t, ttype, bw, test.tokens, nil) 266 267 got := buf.Bytes() 268 if !bytes.Equal(got, wantNI) { 269 t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.wantNoInput, test.wantNoInput+".got") 270 if err := os.WriteFile(test.want+".got", got, 0666); err != nil { 271 t.Error(err) 272 } 273 } else if got[0]&1 == 1 { 274 t.Error("got unexpected EOF") 275 return 276 } 277 278 t.Log("Output ok") 279 280 // Test if the writer produces the same output after reset. 281 buf.Reset() 282 bw.reset(&buf) 283 writeToType(t, ttype, bw, test.tokens, nil) 284 bw.flush() 285 got = buf.Bytes() 286 if !bytes.Equal(got, wantNI) { 287 t.Errorf("reset: writeBlock did not yield expected result for file %q without input. See %q", test.want, test.want+".reset.got") 288 if err := os.WriteFile(test.want+".reset.got", got, 0666); err != nil { 289 t.Error(err) 290 } 291 return 292 } 293 t.Log("Reset ok") 294 testWriterEOF(t, "wb", test, false) 295} 296 297func writeToType(t *testing.T, ttype string, bw *huffmanBitWriter, tok []token, input []byte) { 298 switch ttype { 299 case "wb": 300 bw.writeBlock(tok, false, input) 301 case "dyn": 302 bw.writeBlockDynamic(tok, false, input) 303 default: 304 panic("unknown test type") 305 } 306 307 if bw.err != nil { 308 t.Error(bw.err) 309 return 310 } 311 312 bw.flush() 313 if bw.err != nil { 314 t.Error(bw.err) 315 return 316 } 317} 318 319// testWriterEOF tests if the written block contains an EOF marker. 320func testWriterEOF(t *testing.T, ttype string, test huffTest, useInput bool) { 321 if useInput && test.input == "" { 322 return 323 } 324 var input []byte 325 if useInput { 326 var err error 327 input, err = os.ReadFile(test.input) 328 if err != nil { 329 t.Error(err) 330 return 331 } 332 } 333 var buf bytes.Buffer 334 bw := newHuffmanBitWriter(&buf) 335 switch ttype { 336 case "wb": 337 bw.writeBlock(test.tokens, true, input) 338 case "dyn": 339 bw.writeBlockDynamic(test.tokens, true, input) 340 case "huff": 341 bw.writeBlockHuff(true, input) 342 default: 343 panic("unknown test type") 344 } 345 if bw.err != nil { 346 t.Error(bw.err) 347 return 348 } 349 350 bw.flush() 351 if bw.err != nil { 352 t.Error(bw.err) 353 return 354 } 355 b := buf.Bytes() 356 if len(b) == 0 { 357 t.Error("no output received") 358 return 359 } 360 if b[0]&1 != 1 { 361 t.Errorf("block not marked with EOF for input %q", test.input) 362 return 363 } 364 t.Log("EOF ok") 365} 366