mirror of https://github.com/tidwall/tile38.git
699 lines
17 KiB
Go
699 lines
17 KiB
Go
package lz4_test
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import (
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"bytes"
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"io"
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"io/ioutil"
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"math/big"
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"os"
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"reflect"
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"testing"
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"github.com/pierrec/lz4"
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)
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// testBuffer wraps bytes.Buffer to remove the WriteTo() and ReadFrom() methods.
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type testBuffer struct {
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buf *bytes.Buffer
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}
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func (b *testBuffer) Read(buf []byte) (int, error) {
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return b.buf.Read(buf)
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}
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func (b *testBuffer) Write(buf []byte) (int, error) {
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return b.buf.Write(buf)
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}
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func (b *testBuffer) Len() int {
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return b.buf.Len()
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}
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func (b *testBuffer) Bytes() []byte {
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return b.buf.Bytes()
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}
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// testData represents a test data item. It is really used to provide a human readable label to a slice of bytes.
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type testData struct {
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label string
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data []byte
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}
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// testHeader represents a test data item. It is really used to provide a human readable label to an LZ4 header.
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type testHeader struct {
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label string
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header lz4.Header
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}
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// compareHeaders... compares 2 lz4 headers.
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func compareHeaders(h, hh lz4.Header, t *testing.T) {
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ok := true
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if h.BlockDependency != hh.BlockDependency {
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t.Errorf("BlockDependency: expected %v, got %v", h.BlockDependency, hh.BlockDependency)
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ok = false
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}
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if h.BlockChecksum != hh.BlockChecksum {
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t.Errorf("BlockChecksum: expected %v, got %v", h.BlockChecksum, hh.BlockChecksum)
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ok = false
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}
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if h.NoChecksum != hh.NoChecksum {
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t.Errorf("NoChecksum: expected %v, got %v", h.NoChecksum, hh.NoChecksum)
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ok = false
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}
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if h.BlockMaxSize != hh.BlockMaxSize {
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t.Errorf("BlockMaxSize: expected %d, got %d", h.BlockMaxSize, hh.BlockMaxSize)
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ok = false
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}
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if h.Size != hh.Size {
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t.Errorf("Size: expected %d, got %d", h.Size, hh.Size)
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ok = false
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}
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// if h.Dict != hh.Dict {
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// t.Errorf("Dict: expected %d, got %d", h.Dict, hh.Dict)
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// ok = false
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// }
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// if h.DictID != hh.DictID {
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// t.Errorf("DictID: expected %d, got %d", h.DictID, hh.DictID)
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// ok = false
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// }
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if !ok {
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t.FailNow()
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}
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}
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var (
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lorem = []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.")
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// Initial data items used for testing. More are added with random and other kind of data.
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testDataItems = []testData{
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{"empty", nil},
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{
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"small pattern",
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[]byte("aaaaaaaaaaaaaaaaaaa"),
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},
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{
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"small pattern long",
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[]byte("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"),
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},
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{
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"medium pattern",
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[]byte("abcdefghijklmnopqabcdefghijklmnopq"),
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},
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{
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"lorem",
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lorem,
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},
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}
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testHeaderItems = []testHeader{}
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)
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// Build the list of all possible headers with the default values + the ones defined in the map.
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func buildHeaders(options map[string][]interface{}) []testHeader {
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testHeaderItems := make([]testHeader, 1)
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for fieldName, fieldData := range options {
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for _, o := range fieldData {
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for _, d := range testHeaderItems {
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s := reflect.ValueOf(&d.header).Elem()
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t := s.Type()
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for i := 0; i < s.NumField(); i++ {
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if t.Field(i).Name == fieldName {
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switch f := s.Field(i); f.Kind() {
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case reflect.Bool:
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f.SetBool(o.(bool))
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case reflect.Int:
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f.SetInt(int64(o.(int)))
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case reflect.Int64:
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switch o.(type) {
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case int:
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f.SetInt(int64(o.(int)))
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default:
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f.SetInt(o.(int64))
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}
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case reflect.Uint32:
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switch o.(type) {
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case int:
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f.SetUint(uint64(o.(int)))
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default:
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f.SetUint(uint64(o.(uint32)))
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}
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case reflect.Uint64:
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switch o.(type) {
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case int:
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f.SetUint(uint64(o.(int)))
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default:
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f.SetUint(o.(uint64))
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}
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default:
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panic(fmt.Sprintf("unsupported type: %v", f.Kind()))
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}
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d.label = fmt.Sprintf("%+v", d.header)
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testHeaderItems = append(testHeaderItems, d)
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break
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}
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}
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}
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}
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}
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for i, n := 0, len(testHeaderItems); i < n; {
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testHeaderItem := testHeaderItems[i]
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// remove the 0 BlockMaxSize value as it is invalid and we have provisioned all possible values already.
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if testHeaderItem.header.BlockMaxSize == 0 {
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n--
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testHeaderItems[i], testHeaderItems = testHeaderItems[n], testHeaderItems[:n]
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} else {
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testHeaderItem.label = fmt.Sprintf("%+v", testHeaderItem)
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i++
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}
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}
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return testHeaderItems
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}
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// Generate all possible LZ4 headers.
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func init() {
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// Only set the relevant headers having an impact on the comrpession.
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seed := map[string][]interface{}{
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"BlockDependency": {true},
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"BlockChecksum": {true},
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"NoChecksum": {true},
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// "Dict": {true},
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// Enabling this substantially increase the testing time.
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// As this test is not really required it is disabled.
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// "HighCompression": {true},
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}
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for _, bms := range lz4.BlockMaxSizeItems {
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seed["BlockMaxSize"] = append(seed["BlockMaxSize"], bms)
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}
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testHeaderItems = buildHeaders(seed)
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}
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// Initialize the test data with various sizes of uncompressible and compressible data.
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func init() {
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maxSize := 10 << 20 // > max block max size of 4Mb
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// repeated data with very high compression ratio
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repeat := make([]byte, maxSize)
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for i := copy(repeat, lorem); i < len(repeat); {
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i += copy(repeat[i:], repeat[:i])
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}
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// repeated data with small compression ratio
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repeatlow := make([]byte, maxSize)
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for i := 0; i < len(repeatlow); {
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i += copy(repeatlow[i:], lorem)
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// randomly skip some bytes to make sure the pattern does not repeat too much
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n, _ := rand.Int(rand.Reader, big.NewInt(int64(10)))
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i += int(n.Int64())
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}
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// random data: low to no compression
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random := make([]byte, maxSize)
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if _, err := rand.Read(random); err != nil {
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panic(fmt.Sprintf("cannot initialize random data for size %d", maxSize))
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}
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// generate some test data with various sizes and kind of data: all valid block max sizes + others
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for _, size := range lz4.BlockMaxSizeItems {
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testDataItems = append(
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testDataItems,
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testData{fmt.Sprintf("random %d", size), random[:size]},
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testData{fmt.Sprintf("random < %d", size), random[:size/3]},
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testData{fmt.Sprintf("repeated %d", size), repeat[:size]},
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testData{fmt.Sprintf("repeated < %d", size), repeat[:size/3]},
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)
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}
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}
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// Test low levels core functions:
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// a. compress and compare with supplied data if any
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// b. decompress the previous data and compare it with the original one
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func TestBlock(t *testing.T) {
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for _, compress := range []func([]byte, []byte, int) (int, error){
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lz4.CompressBlock,
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lz4.CompressBlockHC,
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} {
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for _, item := range testDataItems {
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data := item.data
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z := make([]byte, lz4.CompressBlockBound(len(data)))
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n, err := compress(data, z, 0)
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if n == 0 { // not compressible
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continue
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}
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if err != nil {
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t.Errorf("CompressBlock: %s", err)
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t.FailNow()
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}
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z = z[:n]
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d := make([]byte, len(data))
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n, err = lz4.UncompressBlock(z, d, 0)
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if err != nil {
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t.Errorf("UncompressBlock: %s", err)
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t.FailNow()
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}
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d = d[:n]
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if !bytes.Equal(d, data) {
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t.Errorf("invalid decompressed data: %s: %s", item.label, string(d))
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t.FailNow()
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}
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}
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}
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}
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func TestBlockCompression(t *testing.T) {
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input := make([]byte, 64*1024)
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for i := 0; i < 64*1024; i += 1 {
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input[i] = byte(i & 0x1)
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}
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output := make([]byte, 64*1024)
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c, err := lz4.CompressBlock(input, output, 0)
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if err != nil {
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t.Fatal(err)
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}
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if c == 0 {
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t.Fatal("cannot compress compressible data")
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}
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}
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func BenchmarkUncompressBlock(b *testing.B) {
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d := make([]byte, len(lorem))
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z := make([]byte, len(lorem))
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n, err := lz4.CompressBlock(lorem, z, 0)
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if err != nil {
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b.Errorf("CompressBlock: %s", err)
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b.FailNow()
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}
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z = z[:n]
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for i := 0; i < b.N; i++ {
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lz4.UncompressBlock(z, d, 0)
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}
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}
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func BenchmarkCompressBlock(b *testing.B) {
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d := append([]byte{}, lorem...)
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z := make([]byte, len(lorem))
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n, err := lz4.CompressBlock(d, z, 0)
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if err != nil {
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b.Errorf("CompressBlock: %s", err)
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b.FailNow()
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}
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z = z[:n]
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for i := 0; i < b.N; i++ {
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d = append([]byte{}, lorem...)
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lz4.CompressBlock(d, z, 0)
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}
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}
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func BenchmarkCompressBlockHC(b *testing.B) {
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d := append([]byte{}, lorem...)
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z := make([]byte, len(lorem))
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n, err := lz4.CompressBlockHC(d, z, 0)
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if err != nil {
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b.Errorf("CompressBlock: %s", err)
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b.FailNow()
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}
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z = z[:n]
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for i := 0; i < b.N; i++ {
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d = append([]byte{}, lorem...)
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lz4.CompressBlockHC(d, z, 0)
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}
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}
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func BenchmarkCompressEndToEnd(b *testing.B) {
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w := lz4.NewWriter(ioutil.Discard)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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if _, err := w.Write(lorem); 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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// TestNoWrite compresses without any call to Write() (empty frame).
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// It does so checking all possible headers.
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func TestNoWrite(t *testing.T) {
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// that is 2*2*2*2*2*2^4 = 512 headers!
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seed := map[string][]interface{}{
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"BlockDependency": {true},
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"BlockChecksum": {true},
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"NoChecksum": {true},
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"Size": {999},
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// "Dict": {true},
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// Enabling this substantially increase the testing time.
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// As this test is not really required it is disabled.
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// "HighCompression": {true},
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}
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for _, bms := range lz4.BlockMaxSizeItems {
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seed["BlockMaxSize"] = append(seed["BlockMaxSize"], bms)
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}
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testHeaderItems := buildHeaders(seed)
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for _, h := range testHeaderItems {
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rw := bytes.NewBuffer(nil)
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w := lz4.NewWriter(rw)
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w.Header = h.header
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if err := w.Close(); err != nil {
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t.Errorf("Close(): unexpected error: %v", err)
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t.FailNow()
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}
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r := lz4.NewReader(rw)
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n, err := r.Read(nil)
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if err != nil {
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t.Errorf("Read(): unexpected error: %v", err)
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t.FailNow()
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}
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if n != 0 {
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t.Errorf("expected 0 bytes read, got %d", n)
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t.FailNow()
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}
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buf := make([]byte, 16)
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n, err = r.Read(buf)
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if err != nil && err != io.EOF {
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t.Errorf("Read(): unexpected error: %v", err)
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t.FailNow()
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}
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if n != 0 {
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t.Errorf("expected 0 bytes read, got %d", n)
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t.FailNow()
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}
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}
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}
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// TestReset tests that the Reset() method resets the header on the Reader and Writer.
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func TestReset(t *testing.T) {
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h := lz4.Header{
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BlockDependency: true,
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BlockChecksum: true,
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NoChecksum: true,
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BlockMaxSize: 123,
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Size: 999,
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// Dict: true,
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// DictID: 555,
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}
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dh := lz4.Header{}
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w := lz4.NewWriter(nil)
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w.Header = h
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w.Reset(nil)
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compareHeaders(w.Header, dh, t)
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r := lz4.NewReader(nil)
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r.Header = h
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r.Reset(nil)
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compareHeaders(r.Header, dh, t)
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}
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// TestFrame compresses and decompresses LZ4 streams with various input data and options.
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func TestFrame(t *testing.T) {
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for _, tdata := range testDataItems {
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data := tdata.data
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t.Run(tdata.label, func(t *testing.T) {
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t.Parallel()
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// test various options
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for _, headerItem := range testHeaderItems {
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tag := tdata.label + ": " + headerItem.label
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rw := bytes.NewBuffer(nil)
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// Set all options to non default values and compress
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w := lz4.NewWriter(rw)
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w.Header = headerItem.header
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n, err := w.Write(data)
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if err != nil {
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t.Errorf("%s: Write(): unexpected error: %v", tag, err)
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t.FailNow()
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}
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if n != len(data) {
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t.Errorf("%s: Write(): expected %d bytes written, got %d", tag, len(data), n)
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t.FailNow()
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}
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if err = w.Close(); err != nil {
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t.Errorf("%s: Close(): unexpected error: %v", tag, err)
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t.FailNow()
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}
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// Decompress
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r := lz4.NewReader(rw)
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n, err = r.Read(nil)
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if err != nil {
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t.Errorf("%s: Read(): unexpected error: %v", tag, err)
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t.FailNow()
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}
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if n != 0 {
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t.Errorf("%s: Read(): expected 0 bytes read, got %d", tag, n)
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}
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buf := make([]byte, len(data))
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n, err = r.Read(buf)
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if err != nil && err != io.EOF {
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t.Errorf("%s: Read(): unexpected error: %v", tag, err)
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t.FailNow()
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}
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if n != len(data) {
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t.Errorf("%s: Read(): expected %d bytes read, got %d", tag, len(data), n)
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}
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buf = buf[:n]
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if !bytes.Equal(buf, data) {
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t.Errorf("%s: decompress(compress(data)) != data (%d/%d)", tag, len(buf), len(data))
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t.FailNow()
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}
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compareHeaders(w.Header, r.Header, t)
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}
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})
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}
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}
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// TestReadFromWriteTo tests the Reader.WriteTo() and Writer.ReadFrom() methods.
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func TestReadFromWriteTo(t *testing.T) {
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for _, tdata := range testDataItems {
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data := tdata.data
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t.Run(tdata.label, func(t *testing.T) {
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t.Parallel()
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// test various options
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for _, headerItem := range testHeaderItems {
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tag := "ReadFromWriteTo: " + tdata.label + ": " + headerItem.label
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dbuf := bytes.NewBuffer(data)
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zbuf := bytes.NewBuffer(nil)
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w := lz4.NewWriter(zbuf)
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w.Header = headerItem.header
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if _, err := w.ReadFrom(dbuf); err != nil {
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t.Errorf("%s: unexpected error: %s", tag, err)
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t.FailNow()
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}
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if err := w.Close(); err != nil {
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t.Errorf("%s: unexpected error: %s", tag, err)
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t.FailNow()
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}
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buf := bytes.NewBuffer(nil)
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r := lz4.NewReader(zbuf)
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if _, err := r.WriteTo(buf); err != nil {
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t.Errorf("%s: unexpected error: %s", tag, err)
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t.FailNow()
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}
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if !bytes.Equal(buf.Bytes(), data) {
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t.Errorf("%s: decompress(compress(data)) != data (%d/%d)", tag, buf.Len(), len(data))
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t.FailNow()
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}
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}
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})
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}
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}
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// TestCopy will use io.Copy and avoid using Reader.WriteTo() and Writer.ReadFrom().
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func TestCopy(t *testing.T) {
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for _, tdata := range testDataItems {
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data := tdata.data
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t.Run(tdata.label, func(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
w := lz4.NewWriter(nil)
|
|
r := lz4.NewReader(nil)
|
|
// test various options
|
|
for _, headerItem := range testHeaderItems {
|
|
tag := "io.Copy: " + tdata.label + ": " + headerItem.label
|
|
dbuf := &testBuffer{bytes.NewBuffer(data)}
|
|
|
|
zbuf := bytes.NewBuffer(nil)
|
|
w.Reset(zbuf)
|
|
w.Header = headerItem.header
|
|
if _, err := io.Copy(w, dbuf); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
if err := w.Close(); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
buf := &testBuffer{bytes.NewBuffer(nil)}
|
|
r.Reset(zbuf)
|
|
if _, err := io.Copy(buf, r); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
if !bytes.Equal(buf.Bytes(), data) {
|
|
t.Errorf("%s: decompress(compress(data)) != data (%d/%d)", tag, buf.Len(), len(data))
|
|
t.FailNow()
|
|
}
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestSkippable(t *testing.T) {
|
|
w := lz4.NewWriter(nil)
|
|
r := lz4.NewReader(nil)
|
|
|
|
skippable := make([]byte, 1<<20)
|
|
binary.LittleEndian.PutUint32(skippable, lz4.FrameSkipMagic)
|
|
binary.LittleEndian.PutUint32(skippable[4:], uint32(len(skippable)-8))
|
|
|
|
buf := make([]byte, len(lorem))
|
|
|
|
tag := "skippable first"
|
|
zbuf := bytes.NewBuffer(skippable)
|
|
w.Reset(zbuf)
|
|
w.Write(lorem)
|
|
w.Close()
|
|
|
|
r.Reset(zbuf)
|
|
if _, err := r.Read(buf); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
tag = "skippable last"
|
|
zbuf = bytes.NewBuffer(nil)
|
|
w.Reset(zbuf)
|
|
w.Write(lorem)
|
|
w.Close()
|
|
zbuf.Write(skippable)
|
|
|
|
r.Reset(zbuf)
|
|
if _, err := r.Read(buf); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
tag = "skippable middle"
|
|
zbuf = bytes.NewBuffer(nil)
|
|
w.Reset(zbuf)
|
|
w.Write(lorem)
|
|
zbuf.Write(skippable)
|
|
w.Write(lorem)
|
|
w.Close()
|
|
|
|
r.Reset(zbuf)
|
|
if _, err := r.Read(buf); err != nil {
|
|
t.Errorf("%s: unexpected error: %s", tag, err)
|
|
t.FailNow()
|
|
}
|
|
|
|
}
|
|
|
|
func TestWrittenCountAfterBufferedWrite(t *testing.T) {
|
|
w := lz4.NewWriter(bytes.NewBuffer(nil))
|
|
w.Header.BlockDependency = true
|
|
|
|
if n, _ := w.Write([]byte{1}); n != 1 {
|
|
t.Errorf("expected to write 1 byte, wrote %d", n)
|
|
t.FailNow()
|
|
}
|
|
|
|
forcesWrite := make([]byte, 1<<16)
|
|
|
|
if n, _ := w.Write(forcesWrite); n != len(forcesWrite) {
|
|
t.Errorf("expected to write %d bytes, wrote %d", len(forcesWrite), n)
|
|
t.FailNow()
|
|
}
|
|
}
|
|
|
|
func TestWrittenBlocksExactlyWindowSize(t *testing.T) {
|
|
input := make([]byte, 128*1024)
|
|
|
|
copy(input[64*1024-1:], []byte{1, 2, 3, 4, 1, 2, 3, 4})
|
|
|
|
output := writeReadChunked(t, input, 64*1024)
|
|
|
|
if !bytes.Equal(input, output) {
|
|
t.Errorf("output is not equal to source input")
|
|
t.FailNow()
|
|
}
|
|
}
|
|
|
|
func TestWrittenBlocksLessThanWindowSize(t *testing.T) {
|
|
input := make([]byte, 80*1024)
|
|
|
|
copy(input[64*1024-1:], []byte{1, 2, 3, 4, 1, 2, 3, 4})
|
|
copy(input[72*1024-1:], []byte{5, 6, 7, 8, 5, 6, 7, 8})
|
|
|
|
output := writeReadChunked(t, input, 8*1024)
|
|
if !bytes.Equal(input, output) {
|
|
t.Errorf("output is not equal to source input")
|
|
t.FailNow()
|
|
}
|
|
}
|
|
|
|
func writeReadChunked(t *testing.T, in []byte, chunkSize int) []byte {
|
|
compressed := bytes.NewBuffer(nil)
|
|
w := lz4.NewWriter(compressed)
|
|
w.Header.BlockDependency = true
|
|
|
|
buf := bytes.NewBuffer(in)
|
|
for buf.Len() > 0 {
|
|
_, err := w.Write(buf.Next(chunkSize))
|
|
if err != nil {
|
|
t.Errorf("unexpected error: %v", err)
|
|
t.FailNow()
|
|
}
|
|
}
|
|
|
|
r := lz4.NewReader(compressed)
|
|
out := make([]byte, len(in))
|
|
_, err := io.ReadFull(r, out)
|
|
if err != nil {
|
|
t.Errorf("unexpected error: %v", err)
|
|
t.FailNow()
|
|
}
|
|
return out
|
|
}
|
|
|
|
func TestMultiBlockWrite(t *testing.T) {
|
|
f, err := os.Open("testdata/207326ba-36f8-11e7-954a-aca46ba8ca73.png")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer f.Close()
|
|
|
|
zbuf := bytes.NewBuffer(nil)
|
|
zw := lz4.NewWriter(zbuf)
|
|
if _, err := io.Copy(zw, f); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := zw.Flush(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
buf := bytes.NewBuffer(nil)
|
|
zr := lz4.NewReader(zbuf)
|
|
if _, err := io.Copy(buf, zr); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|