const (
		MaxMetadataSize = 1 << 20 // max. size of the metadata
		Version         = 1
	)

	var header [5]byte
	if _, err := io.ReadFull(ciphertext, header[:]); err != nil {
		return nil, err
	}
	if header[0] != Version {
		return nil, fmt.Errorf("config: unknown ciphertext version %d", header[0])
	}
	size := binary.LittleEndian.Uint32(header[1:])

	"bufio"
	"bytes"
	"io"
	"os"
	"strings"
)

func readLinuxProcCPUInfo(buf []byte) error {
	f, err := os.Open("/proc/cpuinfo")
	if err != nil {
		return err
	}
	defer f.Close()

	_, err = io.ReadFull(f, buf)
	if err != nil && err != io.ErrUnexpectedEOF {
		return err
	}

	return nil
}

func osCPUInfoName() string {
	modelName := ""
	cpuMHz := ""

		})
		defer t.Stop()
		entropy, err := os.Open(randomDevice)
		if err != nil {
			r.seedErr = err
			return
		}
		defer entropy.Close()
		_, r.seedErr = io.ReadFull(entropy, r.key[:])
	})
	if r.seedErr != nil {
		return 0, r.seedErr
	}

	r.mu.Lock()
	blockCipher, err := aes.NewCipher(r.key[:])
	if err != nil {
		r.mu.Unlock()
		return 0, err
	}
	var (

		}
	}
	if offset != b.currOffset {
		// Can never happen unless there are programmer bugs
		return 0, errUnexpected
	}
	b.h.Reset()
	_, err = io.ReadFull(b.rc, b.hashBytes)
	if err != nil {
		return 0, err
	}
	_, err = io.ReadFull(b.rc, buf)
	if err != nil {
		return 0, err
	}
	b.h.Write(buf)
	if !bytes.Equal(b.h.Sum(nil), b.hashBytes) {
		return 0, errFileCorrupt
	}

	_, err := w.Write(buf[0:binary.MaxVarintLen64])
	return err
}

// readInt reads an int x from r using buf to buffer the read and returns x.
func readInt(r io.Reader, buf []byte) (int64, error) {
	_, err := io.ReadFull(r, buf[0:binary.MaxVarintLen64]) // ok to continue with error
	x, _ := binary.Varint(buf)
	return x, err
}

// writeSlice writes data[:n] to w and returns n.
// It uses buf to buffer the write.

	if random == nil {
		random = rand.Reader
	}
	if len(extKey) != 32 { // safety check
		logger.CriticalIf(context.Background(), errors.New("crypto: invalid key length"))
	}
	var nonce [32]byte
	if _, err := io.ReadFull(random, nonce[:]); err != nil {
		logger.CriticalIf(context.Background(), errOutOfEntropy)
	}

	const Context = "object-encryption-key generation"
	mac := hmac.New(sha256.New, extKey)
	mac.Write([]byte(Context))

	r, w := Pipe()
	go func() {
		w.Write([]byte{})
		w.Close()
	}()
	var b [2]byte
	ReadFull(r, b[0:2])
	r.Close()
}

func TestWriteNil(t *testing.T) {
	r, w := Pipe()
	go func() {
		w.Write(nil)
		w.Close()
	}()
	var b [2]byte
	ReadFull(r, b[0:2])
	r.Close()
}

func TestWriteAfterWriterClose(t *testing.T) {
	r, w := Pipe()
	defer r.Close()

// struct from its contents. Specified in section B.2.4.2.
func (d *decoder) processDHT(n int) error {
	for n > 0 {
		if n < 17 {
			return FormatError("DHT has wrong length")
		}
		if err := d.readFull(d.tmp[:17]); err != nil {
			return err
		}
		tc := d.tmp[0] >> 4
		if tc > maxTc {
			return FormatError("bad Tc value")
		}
		th := d.tmp[0] & 0x0f

	"debug/macho"
	"encoding/binary"
	"fmt"
	"io"
	"io/fs"
	"os"
)

func readAligned4(r io.Reader, sz int32) ([]byte, error) {
	full := (sz + 3) &^ 3
	data := make([]byte, full)
	_, err := io.ReadFull(r, data)
	if err != nil {
		return nil, err
	}
	data = data[:sz]
	return data, nil
}

func ReadELFNote(filename, name string, typ int32) ([]byte, error) {
	f, err := elf.Open(filename)
	if err != nil {

	if cap(dst) < skip {
		dst = make([]byte, 0, skip+1024)
	}
	dst = dst[:skip]
	if skip > 0 {
		n, err := io.ReadFull(r.buf, dst)
		if err != nil && err != io.ErrUnexpectedEOF {
			// If an EOF happens after reading some but not all the bytes,
			// ReadFull returns ErrUnexpectedEOF.
			return dst[:n], err
		}
		dst = dst[:n]
		if err == io.ErrUnexpectedEOF {
			return dst, io.EOF
		}
	}