// AWS does not appear to append part number on this API call.
		if len(chkSums) > 0 {
			OA.Checksum = &objectAttributesChecksum{
				ChecksumCRC32:     strings.Split(chkSums["CRC32"], "-")[0],
				ChecksumCRC32C:    strings.Split(chkSums["CRC32C"], "-")[0],
				ChecksumSHA1:      strings.Split(chkSums["SHA1"], "-")[0],
				ChecksumSHA256:    strings.Split(chkSums["SHA256"], "-")[0],

	CNEG  LO, R7, R15                          // ef2487da
	CRC32B R17, R8, R16                        // 1041d11a
	CRC32H R3, R21, R27                        // bb46c31a
	CRC32W R22, R30, R9                        // c94bd61a
	CRC32X R20, R4, R15                        // 8f4cd49a
	CRC32CB R19, R27, R22                      // 7653d31a
	CRC32CH R21, R0, R20                       // 1454d51a
	CRC32CW R9, R3, R21                        // 7558c91a

		return fmt.Errorf("invalid part checksum")
	}

	switch c.Type.Base() {
	case ChecksumCRC32:
		v := crc32Combine(crc32.IEEE, binary.BigEndian.Uint32(c.Raw), binary.BigEndian.Uint32(other.Raw), size)
		binary.BigEndian.PutUint32(c.Raw, v)
	case ChecksumCRC32C:
		v := crc32Combine(crc32.Castagnoli, binary.BigEndian.Uint32(c.Raw), binary.BigEndian.Uint32(other.Raw), size)
		binary.BigEndian.PutUint32(c.Raw, v)

    assertHash32(0x1C8600E3, CRC_32, "hell");
    assertHash32(0x3610A686, CRC_32, "hello");
    assertHash32(0xED81F9F6, CRC_32, "hello ");
    assertHash32(0x4850DDC2, CRC_32, "hello w");
    assertHash32(0x7A2D6005, CRC_32, "hello wo");
    assertHash32(0x1C192672, CRC_32, "hello wor");
    assertHash32(0x414FA339, CRC_32, "The quick brown fox jumps over the lazy dog");

		}
		if got.Flags != want.flags {
			t.Errorf("%s: got Flags %#x; want %#x", want.name, got.Flags, want.flags)
		}
		if got.CRC32 != want.crc32 {
			t.Errorf("%s: got CRC32 %#x; want %#x", want.name, got.CRC32, want.crc32)
		}
		if got.CompressedSize64 != want.compressedSize {
			t.Errorf("%s: got CompressedSize64 %d; want %d", want.name, got.CompressedSize64, want.compressedSize)
		}

Russ Cox <******@****.***> 1410149331 -0400

		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 {

		fh.UncompressedSize64 = 0

		ow = dirWriter{}
	} else {
		fh.Flags |= 0x8 // we will write a data descriptor

		fw = &fileWriter{
			zipw:      w.cw,
			compCount: &countWriter{w: w.cw},
			crc32:     crc32.NewIEEE(),
		}
		comp := w.compressor(fh.Method)
		if comp == nil {
			return nil, ErrAlgorithm
		}
		var err error
		fw.comp, err = comp(fw.compCount)
		if err != nil {
			return nil, err

func hashOrder(key string, cardinality int) []int {
	if cardinality <= 0 {
		// Returns an empty int slice for cardinality < 0.
		return nil
	}

	nums := make([]int, cardinality)
	keyCrc := crc32.Checksum([]byte(key), crc32.IEEETable)

	start := int(keyCrc % uint32(cardinality))
	for i := 1; i <= cardinality; i++ {
		nums[i-1] = 1 + ((start + i) % cardinality)
	}
	return nums
}

var (

	// Deprecated: Use Modified instead.
	ModifiedTime uint16

	// ModifiedDate is an MS-DOS-encoded date.
	//
	// Deprecated: Use Modified instead.
	ModifiedDate uint16

	// CRC32 is the CRC32 checksum of the file content.
	CRC32 uint32

	// CompressedSize is the compressed size of the file in bytes.
	// If either the uncompressed or compressed size of the file