// license that can be found in the LICENSE file.

package lzw

import (
	"bufio"
	"errors"
	"fmt"
	"io"
)

// A writer is a buffered, flushable writer.
type writer interface {
	io.ByteWriter
	Flush() error
}

const (
	// A code is a 12 bit value, stored as a uint32 when encoding to avoid
	// type conversions when shifting bits.
	maxCode     = 1<<12 - 1
	invalidCode = 1<<32 - 1

	if h.seed.s == 0 {
		seed := MakeSeed()
		h.seed = seed
		h.state = seed
	}
}

// WriteByte adds b to the sequence of bytes hashed by h.
// It never fails; the error result is for implementing [io.ByteWriter].
func (h *Hash) WriteByte(b byte) error {
	if h.n == len(h.buf) {
		h.flush()
	}
	h.buf[h.n] = b
	h.n++
	return nil
}

// Write adds b to the sequence of bytes hashed by h.