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Source file src/compress/flate/huffman_bit_writer_test.go

Documentation: compress/flate

		 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  	"os"
		12  	"path/filepath"
		13  	"strings"
		14  	"testing"
		15  )
		16  
		17  var 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.
		23  func 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  
		39  func 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  
		96  type 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  
	 103  const ml = 0x7fc00000 // Maximum length token. Used to reduce the size of writeBlockTests
	 104  
	 105  var 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, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 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},
	 111  	},
	 112  	{
	 113  		input:			 "testdata/huffman-pi.in",
	 114  		want:				"testdata/huffman-pi.%s.expect",
	 115  		wantNoInput: "testdata/huffman-pi.%s.expect-noinput",
	 116  		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, 0x4040007e, 0x34, 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	 117  	},
	 118  	{
	 119  		input:			 "testdata/huffman-rand-1k.in",
	 120  		want:				"testdata/huffman-rand-1k.%s.expect",
	 121  		wantNoInput: "testdata/huffman-rand-1k.%s.expect-noinput",
	 122  		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, 0xfd, 0x43, 0x2e, 0xf7, 0xa4, 0x75, 0xda, 0xea, 0x9b, 0xa, 0x64, 0xb, 0xe0, 0x23, 0x29, 0xbd, 0xf7, 0xe7, 0x83, 0x3c, 0xfb, 0xdf, 0xb3, 0xae, 0x4f, 0xa4, 0x47, 0x55, 0x99, 0xde, 0x2f, 0x96, 0x6e, 0x1c, 0x43, 0x4c, 0x87, 0xe2, 0x7c, 0xd9, 0x5f, 0x4c, 0x7c, 0xe8, 0x90, 0x3, 0xdb, 0x30, 0x95, 0xd6, 0x22, 0xc, 0x47, 0xb8, 0x4d, 0x6b, 0xbd, 0x24, 0x11, 0xab, 0x2c, 0xd7, 0xbe, 0x6e, 0x7a, 0xd6, 0x8, 0xa3, 0x98, 0xd8, 0xdd, 0x15, 0x6a, 0xfa, 0x93, 0x30, 0x1, 0x25, 0x1d, 0xa2, 0x74, 0x86, 0x4b, 0x6a, 0x95, 0xe8, 0xe1, 0x4e, 0xe, 0x76, 0xb9, 0x49, 0xa9, 0x5f, 0xa0, 0xa6, 0x63, 0x3c, 0x7e, 0x7e, 0x20, 0x13, 0x4f, 0xbb, 0x66, 0x92, 0xb8, 0x2e, 0xa4, 0xfa, 0x48, 0xcb, 0xae, 0xb9, 0x3c, 0xaf, 0xd3, 0x1f, 0xe1, 0xd5, 0x8d, 0x42, 0x6d, 0xf0, 0xfc, 0x8c, 0xc, 0x0, 0xde, 0x40, 0xab, 0x8b, 0x47, 0x97, 0x4e, 0xa8, 0xcf, 0x8e, 0xdb, 0xa6, 0x8b, 0x20, 0x9, 0x84, 0x7a, 0x66, 0xe5, 0x98, 0x29, 0x2, 0x95, 0xe6, 0x38, 0x32, 0x60, 0x3, 0xe3, 0x9a, 0x1e, 0x54, 0xe8, 0x63, 0x80, 0x48, 0x9c, 0xe7, 0x63, 0x33, 0x6e, 0xa0, 0x65, 0x83, 0xfa, 0xc6, 0xba, 0x7a, 0x43, 0x71, 0x5, 0xf5, 0x68, 0x69, 0x85, 0x9c, 0xba, 0x45, 0xcd, 0x6b, 0xb, 0x19, 0xd1, 0xbb, 0x7f, 0x70, 0x85, 0x92, 0xd1, 0xb4, 0x64, 0x82, 0xb1, 0xe4, 0x62, 0xc5, 0x3c, 0x46, 0x1f, 0x92, 0x31, 0x1c, 0x4e, 0x41, 0x77, 0xf7, 0xe7, 0x87, 0xa2, 0xf, 0x6e, 0xe8, 0x92, 0x3, 0x6b, 0xa, 0xe7, 0xa9, 0x3b, 0x11, 0xda, 0x66, 0x8a, 0x29, 0xda, 0x79, 0xe1, 0x64, 0x8d, 0xe3, 0x54, 0xd4, 0xf5, 0xef, 0x64, 0x87, 0x3b, 0xf4, 0xc2, 0xf4, 0x71, 0x13, 0xa9, 0xe9, 0xe0, 0xa2, 0x6, 0x14, 0xab, 0x5d, 0xa7, 0x96, 0x0, 0xd6, 0xc3, 0xcc, 0x57, 0xed, 0x39, 0x6a, 0x25, 0xcd, 0x76, 0xea, 0xba, 0x3a, 0xf2, 0xa1, 0x95, 0x5d, 0xe5, 0x71, 0xcf, 0x9c, 0x62, 0x9e, 0x6a, 0xfa, 0xd5, 0x31, 0xd1, 0xa8, 0x66, 0x30, 0x33, 0xaa, 0x51, 0x17, 0x13, 0x82, 0x99, 0xc8, 0x14, 0x60, 0x9f, 0x4d, 0x32, 0x6d, 0xda, 0x19, 0x26, 0x21, 0xdc, 0x7e, 0x2e, 0x25, 0x67, 0x72, 0xca, 0xf, 0x92, 0xcd, 0xf6, 0xd6, 0xcb, 0x97, 0x8a, 0x33, 0x58, 0x73, 0x70, 0x91, 0x1d, 0xbf, 0x28, 0x23, 0xa3, 0xc, 0xf1, 0x83, 0xc3, 0xc8, 0x56, 0x77, 0x68, 0xe3, 0x82, 0xba, 0xb9, 0x57, 0x56, 0x57, 0x9c, 0xc3, 0xd6, 0x14, 0x5, 0x3c, 0xb1, 0xaf, 0x93, 0xc8, 0x8a, 0x57, 0x7f, 0x53, 0xfa, 0x2f, 0xaa, 0x6e, 0x66, 0x83, 0xfa, 0x33, 0xd1, 0x21, 0xab, 0x1b, 0x71, 0xb4, 0x7c, 0xda, 0xfd, 0xfb, 0x7f, 0x20, 0xab, 0x5e, 0xd5, 0xca, 0xfd, 0xdd, 0xe0, 0xee, 0xda, 0xba, 0xa8, 0x27, 0x99, 0x97, 0x69, 0xc1, 0x3c, 0x82, 0x8c, 0xa, 0x5c, 0x2d, 0x5b, 0x88, 0x3e, 0x34, 0x35, 0x86, 0x37, 0x46, 0x79, 0xe1, 0xaa, 0x19, 0xfb, 0xaa, 0xde, 0x15, 0x9, 0xd, 0x1a, 0x57, 0xff, 0xb5, 0xf, 0xf3, 0x2b, 0x5a, 0x6a, 0x4d, 0x19, 0x77, 0x71, 0x45, 0xdf, 0x4f, 0xb3, 0xec, 0xf1, 0xeb, 0x18, 0x53, 0x3e, 0x3b, 0x47, 0x8, 0x9a, 0x73, 0xa0, 0x5c, 0x8c, 0x5f, 0xeb, 0xf, 0x3a, 0xc2, 0x43, 0x67, 0xb4, 0x66, 0x67, 0x80, 0x58, 0xe, 0xc1, 0xec, 0x40, 0xd4, 0x22, 0x94, 0xca, 0xf9, 0xe8, 0x92, 0xe4, 0x69, 0x38, 0xbe, 0x67, 0x64, 0xca, 0x50, 0xc7, 0x6, 0x67, 0x42, 0x6e, 0xa3, 0xf0, 0xb7, 0x6c, 0xf2, 0xe8, 0x5f, 0xb1, 0xaf, 0xe7, 0xdb, 0xbb, 0x77, 0xb5, 0xf8, 0xcb, 0x8, 0xc4, 0x75, 0x7e, 0xc0, 0xf9, 0x1c, 0x7f, 0x3c, 0x89, 0x2f, 0xd2, 0x58, 0x3a, 0xe2, 0xf8, 0x91, 0xb6, 0x7b, 0x24, 0x27, 0xe9, 0xae, 0x84, 0x8b, 0xde, 0x74, 0xac, 0xfd, 0xd9, 0xb7, 0x69, 0x2a, 0xec, 0x32, 0x6f, 0xf0, 0x92, 0x84, 0xf1, 0x40, 0xc, 0x8a, 0xbc, 0x39, 0x6e, 0x2e, 0x73, 0xd4, 0x6e, 0x8a, 0x74, 0x2a, 0xdc, 0x60, 0x1f, 0xa3, 0x7, 0xde, 0x75, 0x8b, 0x74, 0xc8, 0xfe, 0x63, 0x75, 0xf6, 0x3d, 0x63, 0xac, 0x33, 0x89, 0xc3, 0xf0, 0xf8, 0x2d, 0x6b, 0xb4, 0x9e, 0x74, 0x8b, 0x5c, 0x33, 0xb4, 0xca, 0xa8, 0xe4, 0x99, 0xb6, 0x90, 0xa1, 0xef, 0xf, 0xd3, 0x61, 0xb2, 0xc6, 0x1a, 0x94, 0x7c, 0x44, 0x55, 0xf4, 0x45, 0xff, 0x9e, 0xa5, 0x5a, 0xc6, 0xa0, 0xe8, 0x2a, 0xc1, 0x8d, 0x6f, 0x34, 0x11, 0xb9, 0xbe, 0x4e, 0xd9, 0x87, 0x97, 0x73, 0xcf, 0x3d, 0x23, 0xae, 0xd5, 0x1a, 0x5e, 0xae, 0x5d, 0x6a, 0x3, 0xf9, 0x22, 0xd, 0x10, 0xd9, 0x47, 0x69, 0x15, 0x3f, 0xee, 0x52, 0xa3, 0x8, 0xd2, 0x3c, 0x51, 0xf4, 0xf8, 0x9d, 0xe4, 0x98, 0x89, 0xc8, 0x67, 0x39, 0xd5, 0x5e, 0x35, 0x78, 0x27, 0xe8, 0x3c, 0x80, 0xae, 0x79, 0x71, 0xd2, 0x93, 0xf4, 0xaa, 0x51, 0x12, 0x1c, 0x4b, 0x1b, 0xe5, 0x6e, 0x15, 0x6f, 0xe4, 0xbb, 0x51, 0x9b, 0x45, 0x9f, 0xf9, 0xc4, 0x8c, 0x2a, 0xfb, 0x1a, 0xdf, 0x55, 0xd3, 0x48, 0x93, 0x27, 0x1, 0x26, 0xc2, 0x6b, 0x55, 0x6d, 0xa2, 0xfb, 0x84, 0x8b, 0xc9, 0x9e, 0x28, 0xc2, 0xef, 0x1a, 0x24, 0xec, 0x9b, 0xae, 0xbd, 0x60, 0xe9, 0x15, 0x35, 0xee, 0x42, 0xa4, 0x33, 0x5b, 0xfa, 0xf, 0xb6, 0xf7, 0x1, 0xa6, 0x2, 0x4c, 0xca, 0x90, 0x58, 0x3a, 0x96, 0x41, 0xe7, 0xcb, 0x9, 0x8c, 0xdb, 0x85, 0x4d, 0xa8, 0x89, 0xf3, 0xb5, 0x8e, 0xfd, 0x75, 0x5b, 0x4f, 0xed, 0xde, 0x3f, 0xeb, 0x38, 0xa3, 0xbe, 0xb0, 0x73, 0xfc, 0xb8, 0x54, 0xf7, 0x4c, 0x30, 0x67, 0x2e, 0x38, 0xa2, 0x54, 0x18, 0xba, 0x8, 0xbf, 0xf2, 0x39, 0xd5, 0xfe, 0xa5, 0x41, 0xc6, 0x66, 0x66, 0xba, 0x81, 0xef, 0x67, 0xe4, 0xe6, 0x3c, 0xc, 0xca, 0xa4, 0xa, 0x79, 0xb3, 0x57, 0x8b, 0x8a, 0x75, 0x98, 0x18, 0x42, 0x2f, 0x29, 0xa3, 0x82, 0xef, 0x9f, 0x86, 0x6, 0x23, 0xe1, 0x75, 0xfa, 0x8, 0xb1, 0xde, 0x17, 0x4a},
	 123  	},
	 124  	{
	 125  		input:			 "testdata/huffman-rand-limit.in",
	 126  		want:				"testdata/huffman-rand-limit.%s.expect",
	 127  		wantNoInput: "testdata/huffman-rand-limit.%s.expect-noinput",
	 128  		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},
	 129  	},
	 130  	{
	 131  		input:			 "testdata/huffman-shifts.in",
	 132  		want:				"testdata/huffman-shifts.%s.expect",
	 133  		wantNoInput: "testdata/huffman-shifts.%s.expect-noinput",
	 134  		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},
	 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, 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},
	 141  	},
	 142  	{
	 143  		input:			 "testdata/huffman-text.in",
	 144  		want:				"testdata/huffman-text.%s.expect",
	 145  		wantNoInput: "testdata/huffman-text.%s.expect-noinput",
	 146  		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},
	 147  	},
	 148  	{
	 149  		input:			 "testdata/huffman-zero.in",
	 150  		want:				"testdata/huffman-zero.%s.expect",
	 151  		wantNoInput: "testdata/huffman-zero.%s.expect-noinput",
	 152  		tokens:			[]token{0x30, ml, 0x4b800000},
	 153  	},
	 154  	{
	 155  		input:			 "",
	 156  		want:				"",
	 157  		wantNoInput: "testdata/null-long-match.%s.expect-noinput",
	 158  		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},
	 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.
	 164  func 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.
	 172  func 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.
	 180  func 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  
	 297  func 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.
	 320  func 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  

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