// ReadSeekCloser is the interface that groups the basic Read, Seek and Close
// methods.
type ReadSeekCloser interface {
	Reader
	Seeker
	Closer
}

// WriteSeeker is the interface that groups the basic Write and Seek methods.
type WriteSeeker interface {
	Writer
	Seeker
}

// ReadWriteSeeker is the interface that groups the basic Read, Write and Seek methods.
type ReadWriteSeeker interface {
	Reader

	fh := md5.New()
	blobs := [][]byte{}
	tlen := uint64(unsafe.Sizeof(coverage.MetaFileHeader{}))
	for _, p := range mm.pkgs {
		var blob []byte
		if pcombine {
			mdw := &slicewriter.WriteSeeker{}
			p.cmdb.Emit(mdw)
			blob = mdw.BytesWritten()
		} else {
			blob = p.mdblob
		}
		ph := md5.Sum(blob)
		blobs = append(blobs, blob)
		if _, err := fh.Write(ph[:]); err != nil {

	}
	return n, err
}

// writeTo writes the content of the current file to w.
// The bytes written matches the number of remaining bytes in the current file.
//
// If the current file is sparse and w is an io.WriteSeeker,
// then writeTo uses Seek to skip past holes defined in Header.SparseHoles,
// assuming that skipped regions are filled with NULs.
// This always writes the last byte to ensure w is the right size.
//

	for k := range p.counterLengths {
		cvn := mkCounterVarName(k)
		fmt.Fprintf(w, "var %s [%d]uint32\n", cvn, p.counterLengths[k])
	}

	// Emit encoded meta-data.
	var sws slicewriter.WriteSeeker
	digest, err := p.mdb.Emit(&sws)
	if err != nil {
		log.Fatalf("encoding meta-data: %v", err)
	}
	p.mdb = nil
	fmt.Fprintf(w, "var %s = [...]byte{\n", mkMetaVar())
	payload := sws.BytesWritten()