See the License for the specific language governing permissions and
limitations under the License.
*/

package tail

import (
	"io"
	"os"
)

const (
	// blockSize is the block size used in tail.
	blockSize = 1024
)

// ReadAtMost reads at most max bytes from the end of the file identified by path or
// returns an error. It returns true if the file was longer than max. It will

func (u UUIDHash) Reset() {
	return
}

// Size -  implement hash.Hash Size
func (u UUIDHash) Size() int {
	return len(u.uuid)
}

// BlockSize -  implement hash.Hash BlockSize
func (u UUIDHash) BlockSize() int {
	return md5.BlockSize
}

var _ hash.Hash = &UUIDHash{}

// NewUUIDHash - new UUIDHash
func NewUUIDHash(uuid []byte) *UUIDHash {
	return &UUIDHash{uuid: uuid}

	lastBlock := header&1 != 0
	blockType := (header >> 1) & 3
	blockSize := int(header >> 3)

	// Maximum block size is smaller of window size and 128K.
	// We don't record the window size for a single segment frame,
	// so just use 128K. RFC 3.1.1.2.3, 3.1.1.2.4.
	if blockSize > 128<<10 || (r.window.size > 0 && blockSize > r.window.size) {
		return r.makeError(relativeOffset, "block size too large")
	}

	blockSize := 20 // must be > 0
	a, b := 0, blockSize
	for b <= n {
		insertionSort{{.FuncSuffix}}(data, a, b {{.ExtraArg}})
		a = b
		b += blockSize
	}
	insertionSort{{.FuncSuffix}}(data, a, n {{.ExtraArg}})

	for blockSize < n {
		a, b = 0, 2*blockSize
		for b <= n {
			symMerge{{.FuncSuffix}}(data, a, a+blockSize, b {{.ExtraArg}})
			a = b
			b += 2 * blockSize

	if len(ticketKeys) == 0 {
		return nil, errors.New("tls: internal error: session ticket keys unavailable")
	}

	encrypted := make([]byte, aes.BlockSize+len(state)+sha256.Size)
	iv := encrypted[:aes.BlockSize]
	ciphertext := encrypted[aes.BlockSize : len(encrypted)-sha256.Size]
	authenticated := encrypted[:len(encrypted)-sha256.Size]
	macBytes := encrypted[len(encrypted)-sha256.Size:]

	DataBlocks int `json:"data"`
	// ParityBlocks is the number of parity blocks for erasure-coding
	ParityBlocks int `json:"parity"`
	// BlockSize is the size of one erasure-coded block
	BlockSize int64 `json:"blockSize"`
	// Index is the index of the current disk
	Index int `json:"index"`
	// Distribution is the distribution of the data and parity blocks
	Distribution []int `json:"distribution"`

	crypto.RegisterHash(crypto.SHA256, New)
}

// The size of a SHA256 checksum in bytes.
const Size = 32

// The size of a SHA224 checksum in bytes.
const Size224 = 28

// The blocksize of SHA256 and SHA224 in bytes.
const BlockSize = 64

const (
	chunk     = 64
	init0     = 0x6A09E667
	init1     = 0xBB67AE85
	init2     = 0x3C6EF372
	init3     = 0xA54FF53A
	init4     = 0x510E527F
	init5     = 0x9B05688C

	}
	w := metacacheWriter{
		mw:        nil,
		blockSize: blockSize,
	}
	w.creator = func() error {
		s2w := s2.NewWriter(out, s2.WriterBlockSize(blockSize), s2.WriterConcurrency(2))
		w.mw = msgp.NewWriter(s2w)
		w.creator = nil
		if err := w.mw.WriteByte(metacacheStreamVersion); err != nil {
			return err
		}

		w.closer = func() (err error) {
			defer func() {
				cerr := s2w.Close()

		ptrs[i] = new(obj)
	}

	writeBarrierBenchmark(b, func() {
		const blockSize = 1024
		var pos int
		for i := 0; i < b.N; i += blockSize {
			// Rotate block.
			block := ptrs[pos : pos+blockSize]
			first := block[0]
			copy(block, block[1:])
			block[blockSize-1] = first

			pos += blockSize
			if pos+blockSize > len(ptrs) {
				pos = 0
			}

			runtime.Gosched()
		}
	})

}

type CryptoReportHash struct {
	Type       [64]uint8
	Blocksize  uint32
	Digestsize uint32
}

type CryptoReportCipher struct {
	Type        [64]uint8
	Blocksize   uint32
	Min_keysize uint32
	Max_keysize uint32
}

type CryptoReportBlkCipher struct {
	Type        [64]uint8
	Geniv       [64]uint8
	Blocksize   uint32
	Min_keysize uint32
	Max_keysize uint32
	Ivsize      uint32