"path/filepath"
	"sort"
	"strings"
	"sync"
	"time"
)

var zipinsecurepath = godebug.New("zipinsecurepath")

var (
	ErrFormat       = errors.New("zip: not a valid zip file")
	ErrAlgorithm    = errors.New("zip: unsupported compression algorithm")
	ErrChecksum     = errors.New("zip: checksum error")
	ErrInsecurePath = errors.New("zip: insecure file path")
)

// A Reader serves content from a ZIP archive.
type Reader struct {

	if len(SHA256) != 0 {
		h = sha256.New()
	}
	return &Reader{
		src:           src,
		size:          size,
		actualSize:    actualSize,
		checksum:      MD5,
		contentSHA256: SHA256,
		sha256:        h,
		disableMD5:    disableMD5,
	}, nil
}

// ErrInvalidChecksum is returned when an invalid checksum is provided in headers.
var ErrInvalidChecksum = errors.New("invalid checksum")

	// ensure that this error is sticky.
	err error
}

type fileReader interface {
	io.Reader
	fileState

	WriteTo(io.Writer) (int64, error)
}

// NewReader creates a new [Reader] reading from r.
func NewReader(r io.Reader) *Reader {
	return &Reader{r: r, curr: &regFileReader{r, 0}}
}

// Next advances to the next entry in the tar archive.