golang-github-klauspost-compress-dev 1.0-2 / usr / share / gocode / src / github.com / klauspost / compress / flate / huffman_bit_writer_test.go

package flate

import (
	"bytes"
	"flag"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

var update = flag.Bool("update", false, "update reference files")

func init() {
	flag.Parse()
}

// TestBlockHuff will test huffman encoding against reference files
// to detect possible regressions.
// If encoding/bit allocation changes you can regenerate these files
// by using the -update switch.
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 := ioutil.ReadFile(in)
	if err != nil {
		t.Fatal(err)
	}
	var buf bytes.Buffer
	bw := newHuffmanBitWriter(&buf)
	bw.writeBlockHuff(false, all)
	bw.flush()
	got := buf.Bytes()

	expected, err := ioutil.ReadFile(out)
	if err != nil && !*update {
		t.Error(out, "-", err)
		return
	}

	t.Logf("Testing %q", in)
	if !bytes.Equal(got, expected) {
		if *update {
			if in != out {
				t.Logf("Updating %q", out)
				if err := ioutil.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 := ioutil.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, expected) {
		t.Errorf("after reset %q != %q (see %q)", in, out, in+".reset.got")
		if err := ioutil.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.
	expect        string // File name of data with the expected output with input available.
	expectNoInput string // File name of the expected output when no input is available.
}

var writeBlockTests = []huffTest{
	huffTest{
		input:         "testdata/huffman-null-max.in",
		expect:        "testdata/huffman-null-max.%s.expect",
		expectNoInput: "testdata/huffman-null-max.%s.expect-noinput",
		tokens:        []token{0x0, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x0, 0x0},
	},
	huffTest{
		input:         "testdata/huffman-pi.in",
		expect:        "testdata/huffman-pi.%s.expect",
		expectNoInput: "testdata/huffman-pi.%s.expect-noinput",
		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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	},
	huffTest{
		input:         "testdata/huffman-rand-1k.in",
		expect:        "testdata/huffman-rand-1k.%s.expect",
		expectNoInput: "testdata/huffman-rand-1k.%s.expect-noinput",
		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},
	},
	huffTest{
		input:         "testdata/huffman-rand-limit.in",
		expect:        "testdata/huffman-rand-limit.%s.expect",
		expectNoInput: "testdata/huffman-rand-limit.%s.expect-noinput",
		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},
	},
	huffTest{
		input:         "testdata/huffman-shifts.in",
		expect:        "testdata/huffman-shifts.%s.expect",
		expectNoInput: "testdata/huffman-shifts.%s.expect-noinput",
		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},
	},
	huffTest{
		input:         "testdata/huffman-text-shift.in",
		expect:        "testdata/huffman-text-shift.%s.expect",
		expectNoInput: "testdata/huffman-text-shift.%s.expect-noinput",
		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},
	},
	huffTest{
		input:         "testdata/huffman-text.in",
		expect:        "testdata/huffman-text.%s.expect",
		expectNoInput: "testdata/huffman-text.%s.expect-noinput",
		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},
	},
	huffTest{
		input:         "testdata/huffman-zero.in",
		expect:        "testdata/huffman-zero.%s.expect",
		expectNoInput: "testdata/huffman-zero.%s.expect-noinput",
		tokens:        []token{0x30, 0x7fc00000, 0x4b800000},
	},
	huffTest{
		input:         "",
		expect:        "",
		expectNoInput: "testdata/null-long-match.%s.expect-noinput",
		tokens:        []token{0x0, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 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0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x7fc00000, 0x41400000},
	},
}

// TestWriteBlock will test that if encoding in writeBlock is changed
// it will become visible.
// To update the reference files use the "-update" parameter on the test.
func TestWriteBlock(t *testing.T) {
	for _, test := range writeBlockTests {
		testBlock(t, test, "wb")
	}
}

// TestWriteBlock will test that if encoding in writeBlockDynamic is changed
// it will become visible.
// To update the reference files use the "-update" parameter on the test.
func TestWriteBlockDynamic(t *testing.T) {
	for _, test := range writeBlockTests {
		testBlock(t, test, "dyn")
	}
}

// testBlock will test a block against its references,
// or regenerate the references, if "-update" is set.
func testBlock(t *testing.T, test huffTest, ttype string) {
	if test.expect != "" {
		test.expect = fmt.Sprintf(test.expect, ttype)
	}
	test.expectNoInput = fmt.Sprintf(test.expectNoInput, ttype)
	if *update {
		if test.input != "" {
			t.Logf("Updating %q", test.expect)
			input, err := ioutil.ReadFile(test.input)
			if err != nil {
				t.Error(err)
				return
			}

			f, err := os.Create(test.expect)
			if err != nil {
				t.Fatal(err)
			}
			defer f.Close()
			bw := newHuffmanBitWriter(f)
			writeToType(t, ttype, bw, test.tokens, input)
		}

		t.Logf("Updating %q", test.expectNoInput)
		f, err := os.Create(test.expectNoInput)
		if err != nil {
			t.Fatal(err)
		}
		defer f.Close()
		bw := newHuffmanBitWriter(f)
		writeToType(t, ttype, bw, test.tokens, nil)
		return
	}

	if test.input != "" {
		t.Logf("Testing %q", test.expect)
		input, err := ioutil.ReadFile(test.input)
		if err != nil {
			t.Error(err)
			return
		}
		expect, err := ioutil.ReadFile(test.expect)
		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, expect) {
			t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.expect, test.expect+".got")
			if err := ioutil.WriteFile(test.expect+".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, expect) {
			t.Errorf("reset: writeBlock did not yield expected result for file %q with input. See %q", test.expect, test.expect+".reset.got")
			if err := ioutil.WriteFile(test.expect+".reset.got", got, 0666); err != nil {
				t.Error(err)
			}
			return
		}
		t.Log("Reset ok")
		testWriterEOF(t, "wb", test, true)
	}
	t.Logf("Testing %q", test.expectNoInput)
	expectN, err := ioutil.ReadFile(test.expectNoInput)
	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, expectN) {
		t.Errorf("writeBlock did not yield expected result for file %q with input. See %q", test.expectNoInput, test.expectNoInput+".got")
		if err := ioutil.WriteFile(test.expect+".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, expectN) {
		t.Errorf("reset: writeBlock did not yield expected result for file %q without input. See %q", test.expect, test.expect+".reset.got")
		if err := ioutil.WriteFile(test.expect+".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(toTokens(tok), false, input)
	case "dyn":
		bw.writeBlockDynamic(toTokens(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
	}
}

func toTokens(in []token) tokens {
	var t = tokens{n: len(in), tokens: make([]token, maxFlateBlockTokens)}
	copy(t.tokens, in)
	return t
}

// testWriterEOF will test 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 = ioutil.ReadFile(test.input)
		if err != nil {
			t.Error(err)
			return
		}
	}
	var buf bytes.Buffer
	bw := newHuffmanBitWriter(&buf)
	switch ttype {
	case "wb":
		bw.writeBlock(toTokens(test.tokens), true, input)
	case "dyn":
		bw.writeBlockDynamic(toTokens(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.Fatal("no output received")
	}
	if b[0]&1 != 1 {
		t.Errorf("block not marked with EOF for input %q", test.input)
		return
	}
	t.Log("EOF ok")
}