diff options
Diffstat (limited to 'src/compress/flate/huffman_bit_writer_test.go')
| -rw-r--r-- | src/compress/flate/huffman_bit_writer_test.go | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/src/compress/flate/huffman_bit_writer_test.go b/src/compress/flate/huffman_bit_writer_test.go new file mode 100644 index 0000000..a57799c --- /dev/null +++ b/src/compress/flate/huffman_bit_writer_test.go @@ -0,0 +1,365 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package flate + +import ( + "bytes" + "flag" + "fmt" + "os" + "path/filepath" + "strings" + "testing" +) + +var update = flag.Bool("update", false, "update reference files") + +// TestBlockHuff tests huffman encoding against reference files +// to detect possible regressions. +// If encoding/bit allocation changes you can regenerate these files +// by using the -update flag. +func TestBlockHuff(t *testing.T) { + // determine input files + match, err := filepath.Glob("testdata/huffman-*.in") + if err != nil { + t.Fatal(err) + } + + for _, in := range match { + out := in // for files where input and output are identical + if strings.HasSuffix(in, ".in") { + out = in[:len(in)-len(".in")] + ".golden" + } + testBlockHuff(t, in, out) + } +} + +func testBlockHuff(t *testing.T, in, out string) { + all, err := os.ReadFile(in) + if err != nil { + t.Error(err) + return + } + var buf bytes.Buffer + bw := newHuffmanBitWriter(&buf) + bw.writeBlockHuff(false, all) + bw.flush() + got := buf.Bytes() + + want, err := os.ReadFile(out) + if err != nil && !*update { + t.Error(err) + return + } + + t.Logf("Testing %q", in) + if !bytes.Equal(got, want) { + if *update { + if in != out { + t.Logf("Updating %q", out) + if err := os.WriteFile(out, got, 0666); err != nil { + t.Error(err) + } + return + } + // in == out: don't accidentally destroy input + t.Errorf("WARNING: -update did not rewrite input file %s", in) + } + + t.Errorf("%q != %q (see %q)", in, out, in+".got") + if err := os.WriteFile(in+".got", got, 0666); err != nil { + t.Error(err) + } + return + } + t.Log("Output ok") + + // Test if the writer produces the same output after reset. + buf.Reset() + bw.reset(&buf) + bw.writeBlockHuff(false, all) + bw.flush() + got = buf.Bytes() + if !bytes.Equal(got, want) { + t.Errorf("after reset %q != %q (see %q)", in, out, in+".reset.got") + if err := os.WriteFile(in+".reset.got", got, 0666); err != nil { + t.Error(err) + } + return + } + t.Log("Reset ok") + testWriterEOF(t, "huff", huffTest{input: in}, true) +} + +type huffTest struct { + tokens []token + input string // File name of input data matching the tokens. + want string // File name of data with the expected output with input available. + wantNoInput string // File name of the expected output when no input is available. +} + +const ml = 0x7fc00000 // Maximum length token. Used to reduce the size of writeBlockTests + +var writeBlockTests = []huffTest{ + { + input: "testdata/huffman-null-max.in", + want: "testdata/huffman-null-max.%s.expect", + wantNoInput: "testdata/huffman-null-max.%s.expect-noinput", + 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, 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*testing.T) { + for _, test := range writeBlockTests { + testBlock(t, test, "wb") + } +} + +// TestWriteBlockDynamic tests if the writeBlockDynamic encoding has changed. +// To update the reference files use the "-update" flag on the test. +func TestWriteBlockDynamic(t *testing.T) { + for _, test := range writeBlockTests { + testBlock(t, test, "dyn") + } +} + +// testBlock tests a block against its references, +// or regenerate the references, if "-update" flag is set. +func testBlock(t *testing.T, test huffTest, ttype string) { + if test.want != "" { + test.want = fmt.Sprintf(test.want, ttype) + } + test.wantNoInput = fmt.Sprintf(test.wantNoInput, ttype) + if *update { + if test.input != "" { + t.Logf("Updating %q", test.want) + input, err := os.ReadFile(test.input) + if err != nil { + t.Error(err) + return + } + + f, err := os.Create(test.want) + if err != nil { + t.Error(err) + return + } + defer f.Close() + bw := newHuffmanBitWriter(f) + writeToType(t, ttype, bw, test.tokens, input) + } + + t.Logf("Updating %q", test.wantNoInput) + f, err := os.Create(test.wantNoInput) + if err != nil { + t.Error(err) + return + } + defer f.Close() + bw := newHuffmanBitWriter(f) + writeToType(t, ttype, bw, test.tokens, nil) + return + } + + if test.input != "" { + t.Logf("Testing %q", test.want) + input, err := os.ReadFile(test.input) + if err != nil { + t.Error(err) + return + } + want, err := os.ReadFile(test.want) + if err != nil { + t.Error(err) + return + } + var buf bytes.Buffer + bw := newHuffmanBitWriter(&buf) + writeToType(t, ttype, bw, test.tokens, input) + + got := buf.Bytes() + if !bytes.Equal(got, want) { + t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".got") + if err := os.WriteFile(test.want+".got", got, 0666); err != nil { + t.Error(err) + } + } + t.Log("Output ok") + + // Test if the writer produces the same output after reset. + buf.Reset() + bw.reset(&buf) + writeToType(t, ttype, bw, test.tokens, input) + bw.flush() + got = buf.Bytes() + if !bytes.Equal(got, want) { + t.Errorf("reset: writeBlock did not yield expected result for file %q with input. See %q", test.want, test.want+".reset.got") + if err := os.WriteFile(test.want+".reset.got", got, 0666); err != nil { + t.Error(err) + } + return + } + t.Log("Reset ok") + testWriterEOF(t, "wb", test, true) + } + t.Logf("Testing %q", test.wantNoInput) + wantNI, err := os.ReadFile(test.wantNoInput) + if err != nil { + t.Error(err) + return + } + var buf bytes.Buffer + bw := newHuffmanBitWriter(&buf) + writeToType(t, ttype, bw, test.tokens, nil) + + got := buf.Bytes() + if !bytes.Equal(got, wantNI) { + t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.wantNoInput, test.wantNoInput+".got") + if err := os.WriteFile(test.want+".got", got, 0666); err != nil { + t.Error(err) + } + } else if got[0]&1 == 1 { + t.Error("got unexpected EOF") + return + } + + t.Log("Output ok") + + // Test if the writer produces the same output after reset. + buf.Reset() + bw.reset(&buf) + writeToType(t, ttype, bw, test.tokens, nil) + bw.flush() + got = buf.Bytes() + if !bytes.Equal(got, wantNI) { + t.Errorf("reset: writeBlock did not yield expected result for file %q without input. See %q", test.want, test.want+".reset.got") + if err := os.WriteFile(test.want+".reset.got", got, 0666); err != nil { + t.Error(err) + } + return + } + t.Log("Reset ok") + testWriterEOF(t, "wb", test, false) +} + +func writeToType(t *testing.T, ttype string, bw *huffmanBitWriter, tok []token, input []byte) { + switch ttype { + case "wb": + bw.writeBlock(tok, false, input) + case "dyn": + bw.writeBlockDynamic(tok, false, input) + default: + panic("unknown test type") + } + + if bw.err != nil { + t.Error(bw.err) + return + } + + bw.flush() + if bw.err != nil { + t.Error(bw.err) + return + } +} + +// testWriterEOF tests if the written block contains an EOF marker. +func testWriterEOF(t *testing.T, ttype string, test huffTest, useInput bool) { + if useInput && test.input == "" { + return + } + var input []byte + if useInput { + var err error + input, err = os.ReadFile(test.input) + if err != nil { + t.Error(err) + return + } + } + var buf bytes.Buffer + bw := newHuffmanBitWriter(&buf) + switch ttype { + case "wb": + bw.writeBlock(test.tokens, true, input) + case "dyn": + bw.writeBlockDynamic(test.tokens, true, input) + case "huff": + bw.writeBlockHuff(true, input) + default: + panic("unknown test type") + } + if bw.err != nil { + t.Error(bw.err) + return + } + + bw.flush() + if bw.err != nil { + t.Error(bw.err) + return + } + b := buf.Bytes() + if len(b) == 0 { + t.Error("no output received") + return + } + if b[0]&1 != 1 { + t.Errorf("block not marked with EOF for input %q", test.input) + return + } + t.Log("EOF ok") +} |