Example #1
0
// lz4.Reader fuzz function
func Fuzz(data []byte) int {
	// uncompress some data
	d, err := ioutil.ReadAll(lz4.NewReader(bytes.NewReader(data)))
	if err != nil {
		return 0
	}

	// got valid compressed data
	// compress the uncompressed data
	// and compare with the original input
	buf := bytes.NewBuffer(nil)
	zw := lz4.NewWriter(buf)
	n, err := zw.Write(d)
	if err != nil {
		panic(err)
	}
	if n != len(d) {
		panic("short write")
	}
	err = zw.Close()
	if err != nil {
		panic(err)
	}

	// uncompress the newly compressed data
	ud, err := ioutil.ReadAll(lz4.NewReader(buf))
	if err != nil {
		panic(err)
	}
	if bytes.Compare(d, ud) != 0 {
		panic("not equal")
	}

	return 1
}
Example #2
0
func DownloadToFile(fileUrl, savePath string) (e error) {
	response, err := client.Get(fileUrl)
	if err != nil {
		return err
	}
	defer response.Body.Close()
	if response.StatusCode != http.StatusOK {
		return fmt.Errorf("%s: %s", fileUrl, response.Status)
	}
	var r io.Reader
	content_encoding := strings.ToLower(response.Header.Get("Content-Encoding"))
	size := response.ContentLength
	if n, e := strconv.ParseInt(response.Header.Get("X-Content-Length"), 10, 64); e == nil {
		size = n
	}
	switch content_encoding {
	case "lz4":
		r = lz4.NewReader(response.Body)
	default:
		r = response.Body
	}
	var f *os.File
	if f, e = os.OpenFile(savePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); e != nil {
		return
	}
	if size >= 0 {
		_, e = io.CopyN(f, r, size)
	} else {
		_, e = io.Copy(f, r)
	}

	f.Close()
	return
}
Example #3
0
func (c *Compressor) BenchmarkLZ4Reader(b *testing.B) {
	cr := lz4.NewReader(c.w)
	b.ResetTimer()

	_, err := io.Copy(ioutil.Discard, cr)
	if err != nil {
		b.Fatal(err)
	}
}
Example #4
0
File: d.go Project: mohae/peu
// DecompressLZ4 decompresses data compressed with lz4 compression. Bytes read
// is returned along with any non io.EOF error that may have occurred.
func DecompressLZ4(r io.Reader, w io.Writer) (int64, error) {
	// create the lz4 reader
	d := lz4.NewReader(r)
	n, err := io.Copy(w, d)
	if err != nil {
		return n, err
	}
	return n, nil
}
Example #5
0
// TestFrame compresses and decompresses LZ4 streams with various input data and options.
func TestFrame(t *testing.T) {
	for _, tdata := range testDataItems {
		data := tdata.data
		// test various options
		for _, headerItem := range testHeaderItems {
			tag := tdata.label + ": " + headerItem.label
			rw := bytes.NewBuffer(nil)

			// Set all options to non default values and compress
			w := lz4.NewWriter(rw)
			w.Header = headerItem.header

			n, err := w.Write(data)
			if err != nil {
				t.Errorf("%s: Write(): unexpected error: %v", tag, err)
				t.FailNow()
			}
			if n != len(data) {
				t.Errorf("%s: Write(): expected %d bytes written, got %d", tag, len(data), n)
				t.FailNow()
			}
			if err = w.Close(); err != nil {
				t.Errorf("%s: Close(): unexpected error: %v", tag, err)
				t.FailNow()
			}

			// Decompress
			r := lz4.NewReader(rw)
			n, err = r.Read(nil)
			if err != nil {
				t.Errorf("%s: Read(): unexpected error: %v", tag, err)
				t.FailNow()
			}
			if n != 0 {
				t.Errorf("%s: Read(): expected 0 bytes read, got %d", tag, n)
			}

			buf := make([]byte, len(data))
			n, err = r.Read(buf)
			if err != nil && err != io.EOF {
				t.Errorf("%s: Read(): unexpected error: %v", tag, err)
				t.FailNow()
			}
			if n != len(data) {
				t.Errorf("%s: Read(): expected %d bytes read, got %d", tag, len(data), n)
			}
			buf = buf[:n]
			if !bytes.Equal(buf, data) {
				t.Errorf("%s: decompress(compress(data)) != data (%d/%d)", tag, len(buf), len(data))
				t.FailNow()
			}

			compareHeaders(w.Header, r.Header, t)
		}
	}
}
Example #6
0
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()
	}

}
Example #7
0
// TestNoWrite compresses without any call to Write() (empty frame).
// It does so checking all possible headers.
func TestNoWrite(t *testing.T) {
	// that is 2*2*2*2*2*2^4 = 512 headers!
	seed := map[string][]interface{}{
		"BlockDependency": {true},
		"BlockChecksum":   {true},
		"NoChecksum":      {true},
		"Size":            {999},
		// "Dict":            {true},
		// Enabling this substantially increase the testing time.
		// As this test is not really required it is disabled.
		// "HighCompression": {true},
	}
	for _, bms := range lz4.BlockMaxSizeItems {
		seed["BlockMaxSize"] = append(seed["BlockMaxSize"], bms)
	}
	testHeaderItems := buildHeaders(seed)

	for _, h := range testHeaderItems {
		rw := bytes.NewBuffer(nil)

		w := lz4.NewWriter(rw)
		w.Header = h.header
		if err := w.Close(); err != nil {
			t.Errorf("Close(): unexpected error: %v", err)
			t.FailNow()
		}

		r := lz4.NewReader(rw)
		n, err := r.Read(nil)
		if err != nil {
			t.Errorf("Read(): unexpected error: %v", err)
			t.FailNow()
		}
		if n != 0 {
			t.Errorf("expected 0 bytes read, got %d", n)
			t.FailNow()
		}

		buf := make([]byte, 16)
		n, err = r.Read(buf)
		if err != nil && err != io.EOF {
			t.Errorf("Read(): unexpected error: %v", err)
			t.FailNow()
		}
		if n != 0 {
			t.Errorf("expected 0 bytes read, got %d", n)
			t.FailNow()
		}
	}
}
Example #8
0
// TestReset tests that the Reset() method resets the header on the Reader and Writer.
func TestReset(t *testing.T) {
	h := lz4.Header{
		BlockDependency: true,
		BlockChecksum:   true,
		NoChecksum:      true,
		BlockMaxSize:    123,
		Size:            999,
		// Dict:            true,
		// DictID:          555,
	}
	dh := lz4.Header{}

	w := lz4.NewWriter(nil)
	w.Header = h
	w.Reset(nil)
	compareHeaders(w.Header, dh, t)

	r := lz4.NewReader(nil)
	r.Header = h
	r.Reset(nil)
	compareHeaders(r.Header, dh, t)
}
Example #9
0
// TestCopy will use io.Copy and avoid using Reader.WriteTo() and Writer.ReadFrom().
func TestCopy(t *testing.T) {
	w := lz4.NewWriter(nil)
	r := lz4.NewReader(nil)
	for _, tdata := range testDataItems {
		data := tdata.data

		// 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 getElevationLz4(lat float64, lon float64) int16 {

	boundingRectangle, err := readBoundingRectangle(aXmlFile)
	check(err)
	upperLeft, lowerRight := calculateUpperLeftAndLowerRightLikeGdalDataSet(boundingRectangle)

	offset := calculateOffset(upperLeft, lowerRight, lat, lon)

	compressedData, err := ioutil.ReadFile(aLz4File)
	check(err)

	bufSize := 2 * NO_OF_PIXELS_PER_LINE * NO_OF_PIXELS_PER_LINE
	var dst []byte
	dst = make([]byte, bufSize)
	reader := lz4.NewReader(bytes.NewReader(compressedData))
	read, err := reader.Read(dst)
	check(err)
	if read != len(dst) {
		// return error, buffer doesn't fit expected file size
	}

	return int16(int(dst[offset])<<8 + int(dst[offset+1]))
}
Example #11
0
func main() {
	// Process command line arguments
	var (
		blockMaxSizeDefault = 4 << 20
		flagStdout          = flag.Bool("c", false, "output to stdout")
		flagDecompress      = flag.Bool("d", false, "decompress flag")
		flagBlockMaxSize    = flag.Int("B", blockMaxSizeDefault, "block max size [64Kb,256Kb,1Mb,4Mb]")
		flagBlockDependency = flag.Bool("BD", false, "enable block dependency")
		flagBlockChecksum   = flag.Bool("BX", false, "enable block checksum")
		flagStreamChecksum  = flag.Bool("Sx", false, "disable stream checksum")
		flagHighCompression = flag.Bool("9", false, "enabled high compression")
	)
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage:\n\t%s [arg] [input]...\n\tNo input means [de]compress stdin to stdout\n\n", os.Args[0])
		flag.PrintDefaults()
	}
	flag.Parse()

	// Use all CPUs
	runtime.GOMAXPROCS(runtime.NumCPU())

	zr := lz4.NewReader(nil)
	zw := lz4.NewWriter(nil)
	zh := lz4.Header{
		BlockDependency: *flagBlockDependency,
		BlockChecksum:   *flagBlockChecksum,
		BlockMaxSize:    *flagBlockMaxSize,
		NoChecksum:      *flagStreamChecksum,
		HighCompression: *flagHighCompression,
	}

	worker := func(in io.Reader, out io.Writer) {
		if *flagDecompress {
			zr.Reset(in)
			if _, err := io.Copy(out, zr); err != nil {
				log.Fatalf("Error while decompressing input: %v", err)
			}
		} else {
			zw.Reset(out)
			zw.Header = zh
			if _, err := io.Copy(zw, in); err != nil {
				log.Fatalf("Error while compressing input: %v", err)
			}
		}
	}

	// No input means [de]compress stdin to stdout
	if len(flag.Args()) == 0 {
		worker(os.Stdin, os.Stdout)
		os.Exit(0)
	}

	// Compress or decompress all input files
	for _, inputFileName := range flag.Args() {
		outputFileName := path.Clean(inputFileName)

		if !*flagStdout {
			if *flagDecompress {
				outputFileName = strings.TrimSuffix(outputFileName, lz4.Extension)
				if outputFileName == inputFileName {
					log.Fatalf("Invalid output file name: same as input: %s", inputFileName)
				}
			} else {
				outputFileName += lz4.Extension
			}
		}

		inputFile, err := os.Open(inputFileName)
		if err != nil {
			log.Fatalf("Error while opening input: %v", err)
		}

		outputFile := os.Stdout
		if !*flagStdout {
			outputFile, err = os.Create(outputFileName)
			if err != nil {
				log.Fatalf("Error while opening output: %v", err)
			}
		}
		worker(inputFile, outputFile)

		inputFile.Close()
		if !*flagStdout {
			outputFile.Close()
		}
	}
}
Example #12
0
func cpdeflate(dst, src io.ReadWriteCloser) {
	r := lz4.NewReader(src)

	io.Copy(dst, r)
}
Example #13
0
func (m *Message) decode(pd packetDecoder) (err error) {
	err = pd.push(&crc32Field{})
	if err != nil {
		return err
	}

	m.Version, err = pd.getInt8()
	if err != nil {
		return err
	}

	attribute, err := pd.getInt8()
	if err != nil {
		return err
	}
	m.Codec = CompressionCodec(attribute & compressionCodecMask)

	if m.Version >= 1 {
		millis, err := pd.getInt64()
		if err != nil {
			return err
		}
		m.Timestamp = time.Unix(millis/1000, (millis%1000)*int64(time.Millisecond))
	}

	m.Key, err = pd.getBytes()
	if err != nil {
		return err
	}

	m.Value, err = pd.getBytes()
	if err != nil {
		return err
	}

	// Required for deep equal assertion during tests but might be useful
	// for future metrics about the compression ratio in fetch requests
	m.compressedSize = len(m.Value)

	switch m.Codec {
	case CompressionNone:
		// nothing to do
	case CompressionGZIP:
		if m.Value == nil {
			break
		}
		reader, err := gzip.NewReader(bytes.NewReader(m.Value))
		if err != nil {
			return err
		}
		if m.Value, err = ioutil.ReadAll(reader); err != nil {
			return err
		}
		if err := m.decodeSet(); err != nil {
			return err
		}
	case CompressionSnappy:
		if m.Value == nil {
			break
		}
		if m.Value, err = snappy.Decode(m.Value); err != nil {
			return err
		}
		if err := m.decodeSet(); err != nil {
			return err
		}
	case CompressionLZ4:
		if m.Value == nil {
			break
		}
		reader := lz4.NewReader(bytes.NewReader(m.Value))
		if m.Value, err = ioutil.ReadAll(reader); err != nil {
			return err
		}
		if err := m.decodeSet(); err != nil {
			return err
		}

	default:
		return PacketDecodingError{fmt.Sprintf("invalid compression specified (%d)", m.Codec)}
	}

	return pd.pop()
}