// 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"
"io/ioutil"
"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 := ioutil.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 := ioutil.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 := 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, want) {
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 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, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 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},
},
{
input: "testdata/huffman-pi.in",
want: "testdata/huffman-pi.%s.expect",
wantNoInput: "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, 0x31, 0x30, 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},
{
input: "testdata/huffman-rand-1k.in",
want: "testdata/huffman-rand-1k.%s.expect",
wantNoInput: "testdata/huffman-rand-1k.%s.expect-noinput",
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},
{
input: "testdata/huffman-rand-limit.in",
want: "testdata/huffman-rand-limit.%s.expect",
wantNoInput: "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},
},
{
input: "testdata/huffman-shifts.in",
want: "testdata/huffman-shifts.%s.expect",
wantNoInput: "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},
},
{
input: "testdata/huffman-text-shift.in",
want: "testdata/huffman-text-shift.%s.expect",
wantNoInput: "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},
},
{
input: "testdata/huffman-text.in",
want: "testdata/huffman-text.%s.expect",
wantNoInput: "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},
},
{
input: "testdata/huffman-zero.in",
want: "testdata/huffman-zero.%s.expect",
wantNoInput: "testdata/huffman-zero.%s.expect-noinput",
tokens: []token{0x30, ml, 0x4b800000},
},
{
input: "",
want: "",
wantNoInput: "testdata/null-long-match.%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, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, ml, 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},
},
}
// TestWriteBlock tests if the writeBlock encoding has changed.
// To update the reference files use the "-update" flag on the test.
func TestWriteBlock(t *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 := ioutil.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 := ioutil.ReadFile(test.input)
if err != nil {
t.Error(err)
return
}
want, err := ioutil.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 := ioutil.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 := ioutil.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 := ioutil.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 := ioutil.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 := ioutil.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 = ioutil.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")
}