240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
}

type context struct {
	table [256]byte
}

// Returns an MTF encoder over the provided io.Writer
func Encoder(writer io.Writer) io.Writer {
	var enc encoder
	enc.table = initial
	enc.target = writer
	return &enc
}

type encoder struct {
	context
	target io.Writer
}

func (c *encoder) Write(data []byte) (int, error) {
	var (
		dataLength int    = len(data)
		buffer     []byte = make([]byte, dataLength)
	)

	// io.Write must not modify the passed data in any way
	// TODO - check sync.Pool or a local free-list for amortizing buffers
	// TODO - use a buffer with a fixed max size to avoid OOM conditions

	// Loop over the input data
	for index, value := range data {

		// Shortcut for sequential, equal values
		if c.table[0] == value {
			buffer[index] = 0
			continue
		}

		// Loop over the MTF table
		for j := byte(1); j != 0; j++ {
			if c.table[j] == value {
				// Output the value
				buffer[index] = j

				// Shift the table
				copy(c.table[1:], c.table[:j])

				// Restore the value in front and break
				c.table[0] = value
				break
			}
		}
	}



























	return c.target.Write(buffer)
}














// Returns an MTF decoder over the provided io.Writer
func Decoder(reader io.Reader) io.Reader {
	var dec decoder
	dec.table = initial
	dec.source = reader
	return &dec
}

type decoder struct {
	context
	source io.Reader
}


func (c *decoder) Read(output []byte) (int, error) {
	var (
		count    int
		err      error
		position byte
	)

	// Read from the source and decode in place
	count, err = c.source.Read(output)
	for i := 0; i < count; i++ {
		position = output[i]

		// Shortcut for sequential, equal values
		if position == 0 {
			output[i] = c.table[0]
			continue
		}

		// Output the value
		output[i] = c.table[position]

		// Shift the table and restore the value in front
		copy(c.table[1:], c.table[:position])
		c.table[0] = output[i]
	}

	return count, err
}