mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
491 lines
12 KiB
Go
491 lines
12 KiB
Go
// Copyright 2009 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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"reflect"
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"sync"
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"testing"
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)
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type deflateTest struct {
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in []byte
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level int
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out []byte
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}
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type deflateInflateTest struct {
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in []byte
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}
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type reverseBitsTest struct {
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in uint16
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bitCount uint8
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out uint16
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}
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var deflateTests = []*deflateTest{
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{[]byte{}, 0, []byte{1, 0, 0, 255, 255}},
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{[]byte{0x11}, -1, []byte{18, 4, 4, 0, 0, 255, 255}},
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{[]byte{0x11}, DefaultCompression, []byte{18, 4, 4, 0, 0, 255, 255}},
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{[]byte{0x11}, 4, []byte{18, 4, 4, 0, 0, 255, 255}},
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{[]byte{0x11}, 0, []byte{0, 1, 0, 254, 255, 17, 1, 0, 0, 255, 255}},
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{[]byte{0x11, 0x12}, 0, []byte{0, 2, 0, 253, 255, 17, 18, 1, 0, 0, 255, 255}},
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{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 0,
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[]byte{0, 8, 0, 247, 255, 17, 17, 17, 17, 17, 17, 17, 17, 1, 0, 0, 255, 255},
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},
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{[]byte{}, 1, []byte{1, 0, 0, 255, 255}},
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{[]byte{0x11}, 1, []byte{18, 4, 4, 0, 0, 255, 255}},
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{[]byte{0x11, 0x12}, 1, []byte{18, 20, 2, 4, 0, 0, 255, 255}},
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{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 1, []byte{18, 132, 2, 64, 0, 0, 0, 255, 255}},
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{[]byte{}, 9, []byte{1, 0, 0, 255, 255}},
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{[]byte{0x11}, 9, []byte{18, 4, 4, 0, 0, 255, 255}},
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{[]byte{0x11, 0x12}, 9, []byte{18, 20, 2, 4, 0, 0, 255, 255}},
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{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 9, []byte{18, 132, 2, 64, 0, 0, 0, 255, 255}},
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}
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var deflateInflateTests = []*deflateInflateTest{
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{[]byte{}},
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{[]byte{0x11}},
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{[]byte{0x11, 0x12}},
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{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}},
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{[]byte{0x11, 0x10, 0x13, 0x41, 0x21, 0x21, 0x41, 0x13, 0x87, 0x78, 0x13}},
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{largeDataChunk()},
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}
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var reverseBitsTests = []*reverseBitsTest{
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{1, 1, 1},
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{1, 2, 2},
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{1, 3, 4},
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{1, 4, 8},
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{1, 5, 16},
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{17, 5, 17},
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{257, 9, 257},
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{29, 5, 23},
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}
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func largeDataChunk() []byte {
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result := make([]byte, 100000)
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for i := range result {
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result[i] = byte(i * i & 0xFF)
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}
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return result
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}
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func TestDeflate(t *testing.T) {
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for _, h := range deflateTests {
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var buf bytes.Buffer
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w, err := NewWriter(&buf, h.level)
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if err != nil {
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t.Errorf("NewWriter: %v", err)
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continue
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}
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w.Write(h.in)
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w.Close()
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if !bytes.Equal(buf.Bytes(), h.out) {
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t.Errorf("Deflate(%d, %x) = %x, want %x", h.level, h.in, buf.Bytes(), h.out)
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}
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}
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}
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// A sparseReader returns a stream consisting of 0s followed by 1<<16 1s.
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// This tests missing hash references in a very large input.
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type sparseReader struct {
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l int64
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cur int64
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}
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func (r *sparseReader) Read(b []byte) (n int, err error) {
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if r.cur >= r.l {
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return 0, io.EOF
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}
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n = len(b)
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cur := r.cur + int64(n)
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if cur > r.l {
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n -= int(cur - r.l)
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cur = r.l
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}
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for i := range b[0:n] {
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if r.cur+int64(i) >= r.l-1<<16 {
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b[i] = 1
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} else {
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b[i] = 0
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}
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}
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r.cur = cur
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return
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}
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func TestVeryLongSparseChunk(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping sparse chunk during short test")
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}
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w, err := NewWriter(ioutil.Discard, 1)
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if err != nil {
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t.Errorf("NewWriter: %v", err)
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return
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}
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if _, err = io.Copy(w, &sparseReader{l: 23E8}); err != nil {
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t.Errorf("Compress failed: %v", err)
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return
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}
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}
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type syncBuffer struct {
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buf bytes.Buffer
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mu sync.RWMutex
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closed bool
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ready chan bool
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}
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func newSyncBuffer() *syncBuffer {
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return &syncBuffer{ready: make(chan bool, 1)}
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}
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func (b *syncBuffer) Read(p []byte) (n int, err error) {
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for {
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b.mu.RLock()
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n, err = b.buf.Read(p)
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b.mu.RUnlock()
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if n > 0 || b.closed {
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return
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}
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<-b.ready
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}
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}
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func (b *syncBuffer) signal() {
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select {
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case b.ready <- true:
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default:
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}
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}
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func (b *syncBuffer) Write(p []byte) (n int, err error) {
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n, err = b.buf.Write(p)
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b.signal()
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return
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}
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func (b *syncBuffer) WriteMode() {
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b.mu.Lock()
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}
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func (b *syncBuffer) ReadMode() {
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b.mu.Unlock()
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b.signal()
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}
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func (b *syncBuffer) Close() error {
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b.closed = true
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b.signal()
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return nil
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}
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func testSync(t *testing.T, level int, input []byte, name string) {
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if len(input) == 0 {
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return
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}
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t.Logf("--testSync %d, %d, %s", level, len(input), name)
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buf := newSyncBuffer()
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buf1 := new(bytes.Buffer)
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buf.WriteMode()
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w, err := NewWriter(io.MultiWriter(buf, buf1), level)
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if err != nil {
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t.Errorf("NewWriter: %v", err)
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return
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}
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r := NewReader(buf)
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// Write half the input and read back.
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for i := 0; i < 2; i++ {
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var lo, hi int
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if i == 0 {
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lo, hi = 0, (len(input)+1)/2
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} else {
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lo, hi = (len(input)+1)/2, len(input)
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}
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t.Logf("#%d: write %d-%d", i, lo, hi)
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if _, err := w.Write(input[lo:hi]); err != nil {
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t.Errorf("testSync: write: %v", err)
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return
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}
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if i == 0 {
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if err := w.Flush(); err != nil {
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t.Errorf("testSync: flush: %v", err)
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return
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}
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} else {
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if err := w.Close(); err != nil {
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t.Errorf("testSync: close: %v", err)
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}
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}
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buf.ReadMode()
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out := make([]byte, hi-lo+1)
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m, err := io.ReadAtLeast(r, out, hi-lo)
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t.Logf("#%d: read %d", i, m)
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if m != hi-lo || err != nil {
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t.Errorf("testSync/%d (%d, %d, %s): read %d: %d, %v (%d left)", i, level, len(input), name, hi-lo, m, err, buf.buf.Len())
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return
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}
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if !bytes.Equal(input[lo:hi], out[:hi-lo]) {
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t.Errorf("testSync/%d: read wrong bytes: %x vs %x", i, input[lo:hi], out[:hi-lo])
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return
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}
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// This test originally checked that after reading
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// the first half of the input, there was nothing left
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// in the read buffer (buf.buf.Len() != 0) but that is
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// not necessarily the case: the write Flush may emit
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// some extra framing bits that are not necessary
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// to process to obtain the first half of the uncompressed
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// data. The test ran correctly most of the time, because
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// the background goroutine had usually read even
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// those extra bits by now, but it's not a useful thing to
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// check.
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buf.WriteMode()
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}
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buf.ReadMode()
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out := make([]byte, 10)
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if n, err := r.Read(out); n > 0 || err != io.EOF {
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t.Errorf("testSync (%d, %d, %s): final Read: %d, %v (hex: %x)", level, len(input), name, n, err, out[0:n])
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}
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if buf.buf.Len() != 0 {
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t.Errorf("testSync (%d, %d, %s): extra data at end", level, len(input), name)
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}
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r.Close()
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// stream should work for ordinary reader too
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r = NewReader(buf1)
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out, err = ioutil.ReadAll(r)
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if err != nil {
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t.Errorf("testSync: read: %s", err)
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return
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}
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r.Close()
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if !bytes.Equal(input, out) {
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t.Errorf("testSync: decompress(compress(data)) != data: level=%d input=%s", level, name)
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}
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}
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func testToFromWithLevelAndLimit(t *testing.T, level int, input []byte, name string, limit int) {
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var buffer bytes.Buffer
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w, err := NewWriter(&buffer, level)
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if err != nil {
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t.Errorf("NewWriter: %v", err)
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return
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}
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w.Write(input)
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w.Close()
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if limit > 0 && buffer.Len() > limit {
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t.Errorf("level: %d, len(compress(data)) = %d > limit = %d", level, buffer.Len(), limit)
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return
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}
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r := NewReader(&buffer)
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out, err := ioutil.ReadAll(r)
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if err != nil {
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t.Errorf("read: %s", err)
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return
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}
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r.Close()
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if !bytes.Equal(input, out) {
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t.Errorf("decompress(compress(data)) != data: level=%d input=%s", level, name)
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return
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}
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testSync(t, level, input, name)
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}
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func testToFromWithLimit(t *testing.T, input []byte, name string, limit [10]int) {
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for i := 0; i < 10; i++ {
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testToFromWithLevelAndLimit(t, i, input, name, limit[i])
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}
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}
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func TestDeflateInflate(t *testing.T) {
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for i, h := range deflateInflateTests {
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testToFromWithLimit(t, h.in, fmt.Sprintf("#%d", i), [10]int{})
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}
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}
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func TestReverseBits(t *testing.T) {
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for _, h := range reverseBitsTests {
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if v := reverseBits(h.in, h.bitCount); v != h.out {
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t.Errorf("reverseBits(%v,%v) = %v, want %v",
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h.in, h.bitCount, v, h.out)
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}
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}
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}
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type deflateInflateStringTest struct {
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filename string
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label string
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limit [10]int
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}
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var deflateInflateStringTests = []deflateInflateStringTest{
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{
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"../testdata/e.txt",
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"2.718281828...",
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[...]int{100018, 50650, 50960, 51150, 50930, 50790, 50790, 50790, 50790, 50790},
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},
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{
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"../testdata/Mark.Twain-Tom.Sawyer.txt",
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"Mark.Twain-Tom.Sawyer",
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[...]int{407330, 187598, 180361, 172974, 169160, 163476, 160936, 160506, 160295, 160295},
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},
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}
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func TestDeflateInflateString(t *testing.T) {
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for _, test := range deflateInflateStringTests {
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gold, err := ioutil.ReadFile(test.filename)
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if err != nil {
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t.Error(err)
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}
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testToFromWithLimit(t, gold, test.label, test.limit)
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if testing.Short() {
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break
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}
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}
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}
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func TestReaderDict(t *testing.T) {
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const (
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dict = "hello world"
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text = "hello again world"
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)
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var b bytes.Buffer
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w, err := NewWriter(&b, 5)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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w.Write([]byte(dict))
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w.Flush()
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b.Reset()
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w.Write([]byte(text))
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w.Close()
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r := NewReaderDict(&b, []byte(dict))
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data, err := ioutil.ReadAll(r)
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if err != nil {
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t.Fatal(err)
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}
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if string(data) != "hello again world" {
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t.Fatalf("read returned %q want %q", string(data), text)
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}
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}
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func TestWriterDict(t *testing.T) {
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const (
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dict = "hello world"
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text = "hello again world"
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)
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var b bytes.Buffer
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w, err := NewWriter(&b, 5)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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w.Write([]byte(dict))
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w.Flush()
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b.Reset()
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w.Write([]byte(text))
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w.Close()
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var b1 bytes.Buffer
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w, _ = NewWriterDict(&b1, 5, []byte(dict))
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w.Write([]byte(text))
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w.Close()
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if !bytes.Equal(b1.Bytes(), b.Bytes()) {
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t.Fatalf("writer wrote %q want %q", b1.Bytes(), b.Bytes())
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}
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}
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// See http://code.google.com/p/go/issues/detail?id=2508
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func TestRegression2508(t *testing.T) {
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if testing.Short() {
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t.Logf("test disabled with -short")
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return
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}
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w, err := NewWriter(ioutil.Discard, 1)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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buf := make([]byte, 1024)
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for i := 0; i < 131072; i++ {
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if _, err := w.Write(buf); err != nil {
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t.Fatalf("writer failed: %v", err)
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}
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}
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w.Close()
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}
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func TestWriterReset(t *testing.T) {
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for level := 0; level <= 9; level++ {
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if testing.Short() && level > 1 {
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break
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}
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w, err := NewWriter(ioutil.Discard, level)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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buf := []byte("hello world")
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for i := 0; i < 1024; i++ {
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w.Write(buf)
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}
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w.Reset(ioutil.Discard)
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wref, err := NewWriter(ioutil.Discard, level)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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// DeepEqual doesn't compare functions.
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w.d.fill, wref.d.fill = nil, nil
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w.d.step, wref.d.step = nil, nil
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if !reflect.DeepEqual(w, wref) {
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t.Errorf("level %d Writer not reset after Reset", level)
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}
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}
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriter(w, NoCompression) })
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriter(w, DefaultCompression) })
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriter(w, BestCompression) })
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dict := []byte("we are the world")
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriterDict(w, NoCompression, dict) })
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriterDict(w, DefaultCompression, dict) })
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testResetOutput(t, func(w io.Writer) (*Writer, error) { return NewWriterDict(w, BestCompression, dict) })
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}
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func testResetOutput(t *testing.T, newWriter func(w io.Writer) (*Writer, error)) {
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buf := new(bytes.Buffer)
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w, err := newWriter(buf)
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if err != nil {
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t.Fatalf("NewWriter: %v", err)
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}
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b := []byte("hello world")
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for i := 0; i < 1024; i++ {
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w.Write(b)
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}
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w.Close()
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out1 := buf.String()
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buf2 := new(bytes.Buffer)
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w.Reset(buf2)
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for i := 0; i < 1024; i++ {
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w.Write(b)
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}
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w.Close()
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out2 := buf2.String()
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if out1 != out2 {
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t.Errorf("got %q, expected %q", out2, out1)
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}
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t.Logf("got %d bytes", len(out1))
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}
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