binary.Write(buf, binary.BigEndian, uint32(headerLength))
	prelude := buf.Bytes()
	binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(prelude))
	buf.Write(header)
	message := buf.Bytes()
	binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(message))

	fmt.Println(buf.Bytes())
}

func genProgressHeader() {
	buf := new(bytes.Buffer)

	buf.WriteByte(13)

	if err != nil {
		return err
	}
	key, err := hex.DecodeString(keyHex[8:])
	if err != nil {
		return err
	}
	// Verify that CRC is ok.
	want := binary.LittleEndian.Uint32(id)
	got := crc32.ChecksumIEEE(key)
	if want != got {
		return fmt.Errorf("Invalid key checksum, want %x, got %x", want, got)
	}

	stream, err := sio.AES_256_GCM.Stream(key)
	if err != nil {
		return err
	}

		w, err := zw.CreateRaw(&zip.FileHeader{
			Name:               name,
			Method:             zip.Store,
			CompressedSize64:   uint64(len(data)),
			UncompressedSize64: uint64(len(data)),
			CRC32:              crc32.ChecksumIEEE(data),
		})
		if err != nil {
			log.Fatal(err)
		}
		if _, err := w.Write(data); err != nil {
			log.Fatal(err)
		}
		seen[name] = true
		return nil
	})
	if err != nil {
		log.Fatal(err)
	}

	binary.Write(buf, binary.BigEndian, uint32(headerLength))
	prelude := buf.Bytes()
	binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(prelude))
	buf.Write(header)
	if payload != nil {
		buf.Write(payload)
	}
	message := buf.Bytes()
	binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(message))

	return buf.Bytes()
}

// Refer genRecordsHeader().
var recordsHeader = []byte{

			method:  Deflate,
		},
	}

	// write a zip file
	archive := new(bytes.Buffer)
	w := NewWriter(archive)

	for i := range files {
		f := &files[i]
		f.crc32 = crc32.ChecksumIEEE(f.content)
		size := uint64(len(f.content))
		f.uncompressedSize = size
		f.compressedSize = size

		var compressedContent []byte
		if f.method == Deflate {
			var buf bytes.Buffer

			// Replace the server prefix/suffix with anonymized ones
			for idx, lbl := range idxMap {
				if len(poolsMatch[idx]) > 0 {
					poolsMatch[idx] = fmt.Sprintf("%s%d", lbl, crc32.ChecksumIEEE([]byte(poolsMatch[idx])))
				}
			}

			// Remove the original pools args present at index 0
			anonPools[pi] = strings.Join(poolsMatch[1:], "")
		}

pkg hash/crc32, const IEEE ideal-int
pkg hash/crc32, const Koopman ideal-int
pkg hash/crc32, const Size ideal-int
pkg hash/crc32, func Checksum([]uint8, *Table) uint32
pkg hash/crc32, func ChecksumIEEE([]uint8) uint32
pkg hash/crc32, func MakeTable(uint32) *Table
pkg hash/crc32, func New(*Table) hash.Hash32
pkg hash/crc32, func NewIEEE() hash.Hash32
pkg hash/crc32, func Update(uint32, *Table, []uint8) uint32