259 lines
7.7 KiB
Go
259 lines
7.7 KiB
Go
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package flate
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"math/rand"
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"runtime"
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"testing"
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)
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func benchmarkEncoder(b *testing.B, testfile, level, n int) {
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b.StopTimer()
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b.SetBytes(int64(n))
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buf0, err := ioutil.ReadFile(testfiles[testfile])
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if err != nil {
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b.Fatal(err)
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}
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if len(buf0) == 0 {
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b.Fatalf("test file %q has no data", testfiles[testfile])
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}
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buf1 := make([]byte, n)
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for i := 0; i < n; i += len(buf0) {
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if len(buf0) > n-i {
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buf0 = buf0[:n-i]
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}
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copy(buf1[i:], buf0)
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}
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buf0 = nil
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runtime.GC()
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w, err := NewWriter(ioutil.Discard, level)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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w.Reset(ioutil.Discard)
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_, err = w.Write(buf1)
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if err != nil {
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b.Fatal(err)
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}
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err = w.Close()
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if err != nil {
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b.Fatal(err)
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}
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}
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}
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func BenchmarkEncodeDigitsConstant1e4(b *testing.B) { benchmarkEncoder(b, digits, constant, 1e4) }
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func BenchmarkEncodeDigitsConstant1e5(b *testing.B) { benchmarkEncoder(b, digits, constant, 1e5) }
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func BenchmarkEncodeDigitsConstant1e6(b *testing.B) { benchmarkEncoder(b, digits, constant, 1e6) }
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func BenchmarkEncodeDigitsSpeed1e4(b *testing.B) { benchmarkEncoder(b, digits, speed, 1e4) }
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func BenchmarkEncodeDigitsSpeed1e5(b *testing.B) { benchmarkEncoder(b, digits, speed, 1e5) }
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func BenchmarkEncodeDigitsSpeed1e6(b *testing.B) { benchmarkEncoder(b, digits, speed, 1e6) }
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func BenchmarkEncodeDigitsDefault1e4(b *testing.B) { benchmarkEncoder(b, digits, default_, 1e4) }
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func BenchmarkEncodeDigitsDefault1e5(b *testing.B) { benchmarkEncoder(b, digits, default_, 1e5) }
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func BenchmarkEncodeDigitsDefault1e6(b *testing.B) { benchmarkEncoder(b, digits, default_, 1e6) }
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func BenchmarkEncodeDigitsCompress1e4(b *testing.B) { benchmarkEncoder(b, digits, compress, 1e4) }
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func BenchmarkEncodeDigitsCompress1e5(b *testing.B) { benchmarkEncoder(b, digits, compress, 1e5) }
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func BenchmarkEncodeDigitsCompress1e6(b *testing.B) { benchmarkEncoder(b, digits, compress, 1e6) }
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func BenchmarkEncodeTwainConstant1e4(b *testing.B) { benchmarkEncoder(b, twain, constant, 1e4) }
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func BenchmarkEncodeTwainConstant1e5(b *testing.B) { benchmarkEncoder(b, twain, constant, 1e5) }
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func BenchmarkEncodeTwainConstant1e6(b *testing.B) { benchmarkEncoder(b, twain, constant, 1e6) }
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func BenchmarkEncodeTwainSpeed1e4(b *testing.B) { benchmarkEncoder(b, twain, speed, 1e4) }
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func BenchmarkEncodeTwainSpeed1e5(b *testing.B) { benchmarkEncoder(b, twain, speed, 1e5) }
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func BenchmarkEncodeTwainSpeed1e6(b *testing.B) { benchmarkEncoder(b, twain, speed, 1e6) }
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func BenchmarkEncodeTwainDefault1e4(b *testing.B) { benchmarkEncoder(b, twain, default_, 1e4) }
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func BenchmarkEncodeTwainDefault1e5(b *testing.B) { benchmarkEncoder(b, twain, default_, 1e5) }
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func BenchmarkEncodeTwainDefault1e6(b *testing.B) { benchmarkEncoder(b, twain, default_, 1e6) }
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func BenchmarkEncodeTwainCompress1e4(b *testing.B) { benchmarkEncoder(b, twain, compress, 1e4) }
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func BenchmarkEncodeTwainCompress1e5(b *testing.B) { benchmarkEncoder(b, twain, compress, 1e5) }
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func BenchmarkEncodeTwainCompress1e6(b *testing.B) { benchmarkEncoder(b, twain, compress, 1e6) }
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// A writer that fails after N writes.
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type errorWriter struct {
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N int
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}
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func (e *errorWriter) Write(b []byte) (int, error) {
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if e.N <= 0 {
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return 0, io.ErrClosedPipe
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}
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e.N--
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return len(b), nil
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}
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// Test if errors from the underlying writer is passed upwards.
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func TestWriteError(t *testing.T) {
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buf := new(bytes.Buffer)
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n := 65536
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if !testing.Short() {
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n *= 4
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}
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for i := 0; i < n; i++ {
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fmt.Fprintf(buf, "asdasfasf%d%dfghfgujyut%dyutyu\n", i, i, i)
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}
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in := buf.Bytes()
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// We create our own buffer to control number of writes.
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copyBuf := make([]byte, 128)
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for l := 0; l < 10; l++ {
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for fail := 1; fail <= 256; fail *= 2 {
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// Fail after 'fail' writes
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ew := &errorWriter{N: fail}
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w, err := NewWriter(ew, l)
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if err != nil {
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t.Fatalf("NewWriter: level %d: %v", l, err)
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}
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n, err := copyBuffer(w, bytes.NewBuffer(in), copyBuf)
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if err == nil {
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t.Fatalf("Level %d: Expected an error, writer was %#v", l, ew)
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}
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n2, err := w.Write([]byte{1, 2, 2, 3, 4, 5})
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if n2 != 0 {
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t.Fatal("Level", l, "Expected 0 length write, got", n)
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}
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if err == nil {
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t.Fatal("Level", l, "Expected an error")
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}
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err = w.Flush()
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if err == nil {
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t.Fatal("Level", l, "Expected an error on flush")
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}
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err = w.Close()
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if err == nil {
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t.Fatal("Level", l, "Expected an error on close")
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}
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w.Reset(ioutil.Discard)
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n2, err = w.Write([]byte{1, 2, 3, 4, 5, 6})
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if err != nil {
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t.Fatal("Level", l, "Got unexpected error after reset:", err)
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}
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if n2 == 0 {
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t.Fatal("Level", l, "Got 0 length write, expected > 0")
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}
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if testing.Short() {
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return
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}
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}
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}
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}
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func TestDeterministicL1(t *testing.T) { testDeterministic(1, t) }
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func TestDeterministicL2(t *testing.T) { testDeterministic(2, t) }
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func TestDeterministicL3(t *testing.T) { testDeterministic(3, t) }
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func TestDeterministicL4(t *testing.T) { testDeterministic(4, t) }
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func TestDeterministicL5(t *testing.T) { testDeterministic(5, t) }
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func TestDeterministicL6(t *testing.T) { testDeterministic(6, t) }
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func TestDeterministicL7(t *testing.T) { testDeterministic(7, t) }
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func TestDeterministicL8(t *testing.T) { testDeterministic(8, t) }
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func TestDeterministicL9(t *testing.T) { testDeterministic(9, t) }
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func TestDeterministicL0(t *testing.T) { testDeterministic(0, t) }
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func TestDeterministicLM2(t *testing.T) { testDeterministic(-2, t) }
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func testDeterministic(i int, t *testing.T) {
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// Test so much we cross a good number of block boundaries.
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var length = maxStoreBlockSize*30 + 500
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if testing.Short() {
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length /= 10
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}
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// Create a random, but compressible stream.
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rng := rand.New(rand.NewSource(1))
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t1 := make([]byte, length)
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for i := range t1 {
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t1[i] = byte(rng.Int63() & 7)
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}
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// Do our first encode.
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var b1 bytes.Buffer
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br := bytes.NewBuffer(t1)
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w, err := NewWriter(&b1, i)
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if err != nil {
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t.Fatal(err)
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}
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// Use a very small prime sized buffer.
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cbuf := make([]byte, 787)
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_, err = copyBuffer(w, br, cbuf)
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if err != nil {
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t.Fatal(err)
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}
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w.Close()
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// We choose a different buffer size,
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// bigger than a maximum block, and also a prime.
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var b2 bytes.Buffer
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cbuf = make([]byte, 81761)
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br2 := bytes.NewBuffer(t1)
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w2, err := NewWriter(&b2, i)
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if err != nil {
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t.Fatal(err)
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}
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_, err = copyBuffer(w2, br2, cbuf)
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if err != nil {
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t.Fatal(err)
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}
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w2.Close()
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b1b := b1.Bytes()
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b2b := b2.Bytes()
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if !bytes.Equal(b1b, b2b) {
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t.Errorf("level %d did not produce deterministic result, result mismatch, len(a) = %d, len(b) = %d", i, len(b1b), len(b2b))
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}
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// Test using io.WriterTo interface.
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var b3 bytes.Buffer
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br = bytes.NewBuffer(t1)
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w, err = NewWriter(&b3, i)
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if err != nil {
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t.Fatal(err)
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}
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_, err = br.WriteTo(w)
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if err != nil {
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t.Fatal(err)
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}
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w.Close()
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b3b := b3.Bytes()
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if !bytes.Equal(b1b, b3b) {
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t.Errorf("level %d (io.WriterTo) did not produce deterministic result, result mismatch, len(a) = %d, len(b) = %d", i, len(b1b), len(b3b))
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}
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}
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// copyBuffer is a copy of io.CopyBuffer, since we want to support older go versions.
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// This is modified to never use io.WriterTo or io.ReaderFrom interfaces.
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func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
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if buf == nil {
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buf = make([]byte, 32*1024)
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}
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for {
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nr, er := src.Read(buf)
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if nr > 0 {
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nw, ew := dst.Write(buf[0:nr])
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if nw > 0 {
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written += int64(nw)
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}
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if ew != nil {
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err = ew
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break
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}
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if nr != nw {
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err = io.ErrShortWrite
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break
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}
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}
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if er == io.EOF {
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break
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}
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if er != nil {
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err = er
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break
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}
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}
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return written, err
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}
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