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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>rabaead: Go Coverage Report</title>
<style>
body {
background: black;
color: rgb(80, 80, 80);
}
body, pre, #legend span {
font-family: Menlo, monospace;
font-weight: bold;
}
#topbar {
background: black;
position: fixed;
top: 0; left: 0; right: 0;
height: 42px;
border-bottom: 1px solid rgb(80, 80, 80);
}
#content {
margin-top: 50px;
}
#nav, #legend {
float: left;
margin-left: 10px;
}
#legend {
margin-top: 12px;
}
#nav {
margin-top: 10px;
}
#legend span {
margin: 0 5px;
}
.cov0 { color: rgb(192, 0, 0) }
.cov1 { color: rgb(128, 128, 128) }
.cov2 { color: rgb(116, 140, 131) }
.cov3 { color: rgb(104, 152, 134) }
.cov4 { color: rgb(92, 164, 137) }
.cov5 { color: rgb(80, 176, 140) }
.cov6 { color: rgb(68, 188, 143) }
.cov7 { color: rgb(56, 200, 146) }
.cov8 { color: rgb(44, 212, 149) }
.cov9 { color: rgb(32, 224, 152) }
.cov10 { color: rgb(20, 236, 155) }
</style>
</head>
<body>
<div id="topbar">
<div id="nav">
<select id="files">
<option value="file0">snix.ir/rabaead/chunk.go (83.5%)</option>
<option value="file1">snix.ir/rabaead/cipher.go (83.3%)</option>
<option value="file2">snix.ir/rabaead/genlap.go (100.0%)</option>
<option value="file3">snix.ir/rabaead/helper.go (100.0%)</option>
<option value="file4">snix.ir/rabaead/ioaead.go (90.8%)</option>
</select>
</div>
<div id="legend">
<span>not tracked</span>
<span class="cov0">not covered</span>
<span class="cov8">covered</span>
</div>
</div>
<div id="content">
<pre class="file" id="file0" style="display: none">package rabaead
import (
"bytes"
"crypto/cipher"
"encoding/binary"
"io"
"snix.ir/rabbitio"
)
const cmrk = 0x08 // chunk size indicator,
// without this reader cannot calculate actual size of plaintext
// additional data func, return value is used as AD in Seal and Open
// nil AdFunc is harmless and equal to func()[]byte{return nil}
type AdditionalFunc func() []byte
type chunkReader struct {
aead cipher.AEAD
csize int
rader io.Reader
buff []byte
nonce []byte
adexe AdditionalFunc
}
type chunkWriter struct {
aead cipher.AEAD
csize int
writer io.Writer
buff []byte
nonce []byte
adexe AdditionalFunc
}
// NewChunkReader returns a chunkReader data type, this reader reads and open() aead
// ciphertext, each chunk has its own tag and cmrk value.
// this reader has a chunk size in-memory buffer, large chunk size can make application to runs
// out of memory, thus is most suitable for sliced data, like network data transmit and so..
func NewChunkReader(r io.Reader, chnk int, a cipher.AEAD, nonce []byte, f AdditionalFunc) (*chunkReader, error) <span class="cov8" title="1">{
if len(nonce) != rabbitio.IVXLen && len(nonce) != 0 </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidIVX
}</span>
<span class="cov8" title="1">s := &chunkReader{
aead: a,
buff: []byte{},
nonce: make([]byte, len(nonce)),
csize: chnk,
rader: r,
adexe: f,
}
if s.adexe == nil </span><span class="cov8" title="1">{
s.adexe = func() []byte </span><span class="cov8" title="1">{ return nil }</span>
}
<span class="cov8" title="1">copy(s.nonce, nonce)
return s, nil</span>
}
// NewChunkWriter returns a chunkWriter data type, this writer sale() and write aead
// plaintext, each chunk has its own tag and cmrk value.
// this writer has a chunk size in-memory buffer, large chunk size can make application to
// runs out of memory, thus is most suitable for sliced data, like network data transmit and so..
func NewChunkWriter(w io.Writer, chnk int, a cipher.AEAD, nonce []byte, f AdditionalFunc) (*chunkWriter, error) <span class="cov8" title="1">{
if len(nonce) != rabbitio.IVXLen && len(nonce) != 0 </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidIVX
}</span>
<span class="cov8" title="1">s := &chunkWriter{
aead: a,
buff: []byte{},
nonce: make([]byte, len(nonce)),
csize: chnk,
writer: w,
adexe: f,
}
if s.adexe == nil </span><span class="cov8" title="1">{
s.adexe = func() []byte </span><span class="cov8" title="1">{ return nil }</span>
}
<span class="cov8" title="1">copy(s.nonce, nonce)
return s, nil</span>
}
// Close method, if there is any
func (w *chunkWriter) Close() error <span class="cov8" title="1">{
if c, ok := w.writer.(io.Closer); ok </span><span class="cov0" title="0">{
return c.Close()
}</span>
<span class="cov8" title="1">return nil</span>
}
// Write writes plaintext chunk into the sale() and underlying writer
// write would not report overhead data (chunk size marker and poly1305 tag) in
// written return value. for each chunk there is 8+16 byte overhead data.
// AdFunc will be triggered for each chunk of data
func (w *chunkWriter) Write(b []byte) (n int, err error) <span class="cov8" title="1">{
w.buff = b
for len(w.buff) > 0 </span><span class="cov8" title="1">{
s, err := w.write()
if err != nil </span><span class="cov0" title="0">{
return n, err
}</span>
<span class="cov8" title="1">n += s</span>
}
<span class="cov8" title="1">return</span>
}
func (w *chunkWriter) write() (int, error) <span class="cov8" title="1">{
size := cmrk + w.csize + w.aead.Overhead()
chnk := make([]byte, size)
var n int
var err error
if len(w.buff) > 0 </span><span class="cov8" title="1">{
s := copy(chnk[cmrk:len(chnk)-w.aead.Overhead()], w.buff)
w.buff = w.buff[s:]
copy(chnk[0:cmrk], uint64Little(uint64(s)))
w.aead.Seal(chnk[:0], w.nonce, chnk[:cmrk+w.csize], w.adexe())
_, err = w.writer.Write(chnk)
if err != nil </span><span class="cov0" title="0">{
return n, err
}</span>
<span class="cov8" title="1">n += s</span>
}
<span class="cov8" title="1">return n, err</span>
}
// Read reads and open() ciphertext chunk from underlying reader
// read would not report overhead data (chunk size marker and poly1305 tag) in its
// return value. if the read data from underlying reader is corrupted, ErrAuthMsg
// error will be returned. for each chunk there is 8+16 byte overhead data.
// AdFunc will be triggered for each chunk of data
func (r *chunkReader) Read(b []byte) (int, error) <span class="cov8" title="1">{
if len(b) <= r.csize </span><span class="cov0" title="0">{
return r.readTo(b)
}</span>
<span class="cov8" title="1">n := 0
for </span><span class="cov8" title="1">{
if n+r.csize > len(b) </span><span class="cov8" title="1">{
sr, err := r.readTo(b[n:])
n += sr
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
<span class="cov0" title="0">break</span>
}
<span class="cov8" title="1">sr, err := r.readTo(b[n : n+r.csize])
n += sr
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
}
<span class="cov0" title="0">return n, nil</span>
}
func (r *chunkReader) readTo(b []byte) (int, error) <span class="cov8" title="1">{
var n int
if len(r.buff) > 0 </span><span class="cov0" title="0">{
n = copy(b, r.buff)
r.buff = r.buff[n:]
return n, nil
}</span>
<span class="cov8" title="1">sr, err := r.read()
n = copy(b, r.buff[:sr])
r.buff = r.buff[n:]
return n, err</span>
}
func (r *chunkReader) read() (int, error) <span class="cov8" title="1">{
var n int
size := cmrk + r.csize + r.aead.Overhead()
chnk := make([]byte, size)
chLE := uint64Little(uint64(r.csize))
si, err := io.ReadFull(r.rader, chnk)
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
<span class="cov8" title="1">if si > 0 </span><span class="cov8" title="1">{
_, err = r.aead.Open(chnk[:0], r.nonce, chnk, r.adexe())
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
<span class="cov8" title="1">if bytes.Equal(chnk[0:cmrk], chLE) </span><span class="cov8" title="1">{
n += r.csize
r.buff = append(r.buff, chnk[cmrk:cmrk+r.csize]...)
}</span> else<span class="cov0" title="0"> {
f := binary.LittleEndian.Uint64(chnk[0:cmrk])
n += int(f)
r.buff = append(r.buff, chnk[cmrk:cmrk+f]...)
}</span>
}
<span class="cov8" title="1">return n, err</span>
}
func uint64Little(n uint64) []byte <span class="cov8" title="1">{
b := make([]byte, cmrk)
binary.LittleEndian.PutUint64(b, n)
return b
}</span>
</pre>
<pre class="file" id="file1" style="display: none">package rabaead
import (
"crypto/cipher"
"errors"
"snix.ir/poly1305"
"snix.ir/rabbitio"
)
const polykeylen = 0x20 // poly1305 key len: 32byte
var ErrAuthMsg = errors.New("rabaead: message authentication failed")
var erroverlap = errors.New("rabaead: invalid buffer memory overlap")
type rabbitPoly1305 struct {
key []byte // rabbit cipher key
noncesize int // rabbit iv size
}
// NewAEAD returns a rabbit aead data-type
// key must be 16 byte len
func NewAEAD(key []byte) (cipher.AEAD, error) <span class="cov8" title="1">{ return newRabbitAead(key) }</span>
func newRabbitAead(key []byte) (cipher.AEAD, error) <span class="cov8" title="1">{
if len(key) != rabbitio.KeyLen </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidKey
}</span>
<span class="cov8" title="1">rabbitAead := &rabbitPoly1305{
noncesize: rabbitio.IVXLen,
key: make([]byte, rabbitio.KeyLen),
}
copy(rabbitAead.key[:], key)
return rabbitAead, nil</span>
}
// Overhead returns poly1305 tag size: 16byte
func (c *rabbitPoly1305) Overhead() int <span class="cov8" title="1">{ return poly1305.TagSize }</span>
// NonceSize returns rabbit iv len: 8byte
func (c *rabbitPoly1305) NonceSize() int <span class="cov0" title="0">{ return c.noncesize }</span>
func (c *rabbitPoly1305) sealRabbit(dst, nonce, plaintext, ad []byte) []byte <span class="cov8" title="1">{
ret, out := headtail(dst, len(plaintext)+poly1305.TagSize)
ciphertext, tag := out[:len(plaintext)], out[len(plaintext):]
if inexactOverlap(out, plaintext) </span><span class="cov0" title="0">{
panic(erroverlap)</span> //should never happen
}
<span class="cov8" title="1">var polyKey [polykeylen]byte
s, err := rabbitio.NewCipher(c.key, nonce)
if err != nil </span><span class="cov0" title="0">{
panic(err)</span>
}
<span class="cov8" title="1">s.XORKeyStream(polyKey[:], polyKey[:])
p := poly1305.New(&polyKey)
writePadding(p, ad)
s, err = rabbitio.NewCipher(c.key, nonce)
if err != nil </span><span class="cov0" title="0">{
panic(err)</span>
}
<span class="cov8" title="1">s.XORKeyStream(ciphertext, plaintext)
writePadding(p, ciphertext)
writeUint64(p, len(ad))
writeUint64(p, len(plaintext))
p.Sum(tag[:0x00])
return ret</span>
}
func (c *rabbitPoly1305) openRabbit(dst, nonce, ciphertext, ad []byte) ([]byte, error) <span class="cov8" title="1">{
tag := ciphertext[len(ciphertext)-poly1305.TagSize:]
ciphertext = ciphertext[:len(ciphertext)-poly1305.TagSize]
var polyKey [polykeylen]byte
s, err := rabbitio.NewCipher(c.key, nonce)
if err != nil </span><span class="cov0" title="0">{
panic(err)</span>
}
<span class="cov8" title="1">s.XORKeyStream(polyKey[:], polyKey[:])
p := poly1305.New(&polyKey)
writePadding(p, ad)
writePadding(p, ciphertext)
writeUint64(p, len(ad))
writeUint64(p, len(ciphertext))
ret, out := headtail(dst, len(ciphertext))
if inexactOverlap(out, ciphertext) </span><span class="cov0" title="0">{
panic(erroverlap)</span> //should never happen
}
// check data integrity
<span class="cov8" title="1">if !p.Verify(tag) </span><span class="cov8" title="1">{
return nil, ErrAuthMsg
}</span>
<span class="cov8" title="1">s, err = rabbitio.NewCipher(c.key, nonce)
if err != nil </span><span class="cov0" title="0">{
panic(err)</span>
}
<span class="cov8" title="1">s.XORKeyStream(out, ciphertext)
return ret, nil</span>
}
// Open opens a rabbit aead ciphertext.
// panic occurs if nonce len is not equal to IVXLen (8byte) or zero
// if data is not verified, ErrAuthMsg will be returned
func (c *rabbitPoly1305) Open(dst, nonce, ciphertext, ad []byte) ([]byte, error) <span class="cov8" title="1">{
if len(ciphertext) < poly1305.TagSize </span><span class="cov0" title="0">{
return nil, ErrAuthMsg
}</span>
<span class="cov8" title="1">return c.openRabbit(dst, nonce, ciphertext, ad)</span>
}
// Seal seals a plaintext into the rabbit aead ciphertext.
// panic occurs if nonce len is not equal to IVXLen (8byte) or zero
func (c *rabbitPoly1305) Seal(dst, nonce, plaintext, ad []byte) []byte <span class="cov8" title="1">{
return c.sealRabbit(dst, nonce, plaintext, ad)
}</span>
</pre>
<pre class="file" id="file2" style="display: none">//go:build !appengine
package rabaead
import "unsafe"
func anyOverlap(x, y []byte) bool <span class="cov8" title="1">{
return len(x) > 0 && len(y) > 0 &&
uintptr(unsafe.Pointer(&x[0])) <= uintptr(unsafe.Pointer(&y[len(y)-1])) &&
uintptr(unsafe.Pointer(&y[0])) <= uintptr(unsafe.Pointer(&x[len(x)-1]))
}</span>
func inexactOverlap(x, y []byte) bool <span class="cov8" title="1">{
if len(x) == 0 || len(y) == 0 || &x[0] == &y[0] </span><span class="cov8" title="1">{
return false
}</span>
<span class="cov8" title="1">return anyOverlap(x, y)</span>
}
</pre>
<pre class="file" id="file3" style="display: none">package rabaead
import (
"encoding/binary"
"snix.ir/poly1305"
)
func headtail(in []byte, n int) (head, tail []byte) <span class="cov8" title="1">{
total := len(in) + n
if cap(in) >= total </span><span class="cov8" title="1">{
head = in[:total]
}</span> else<span class="cov8" title="1"> {
head = make([]byte, total)
copy(head, in)
}</span>
<span class="cov8" title="1">tail = head[len(in):]
return</span>
}
func writePadding(p *poly1305.MAC, b []byte) <span class="cov8" title="1">{
p.Write(b)
if rem := len(b) % 16; rem != 0 </span><span class="cov8" title="1">{
var buf [16]byte
padLen := 16 - rem
p.Write(buf[:padLen])
}</span>
}
func writeUint64(p *poly1305.MAC, n int) <span class="cov8" title="1">{
var buf [8]byte
binary.LittleEndian.PutUint64(buf[:], uint64(n))
p.Write(buf[:])
}</span>
</pre>
<pre class="file" id="file4" style="display: none">package rabaead
import (
"crypto/cipher"
"errors"
"io"
"snix.ir/poly1305"
"snix.ir/rabbitio"
)
type streamReader struct {
ie *ioaead
cip cipher.Stream
firstRead bool
nwr int
read io.Reader
buff []byte
temp []byte
tagc []byte
}
type ioaead struct {
key []byte // rabbit cipher key
nonce []byte
poly *poly1305.MAC
adlen int
additionalData AdditionalFunc
}
type streamWriter struct {
ie *ioaead
writer io.Writer
plainWriter io.Writer
nwr int
firstWrite bool
}
var errunderio = errors.New("underlying io reader returns wrong read value, which is not supposed to happen")
func makeioaead(key, iv []byte, adfunc AdditionalFunc) *ioaead <span class="cov8" title="1">{
if adfunc == nil </span><span class="cov8" title="1">{
adfunc = func() []byte </span><span class="cov8" title="1">{ return nil }</span>
}
<span class="cov8" title="1">str := &ioaead{
key: make([]byte, rabbitio.KeyLen),
nonce: make([]byte, len(iv)),
}
str.additionalData = adfunc
copy(str.key, key)
copy(str.nonce, iv)
var poly [polykeylen]byte
cph, _ := rabbitio.NewCipher(str.key, str.nonce)
cph.XORKeyStream(poly[:], poly[:])
str.poly = poly1305.New(&poly)
return str</span>
}
func (s *ioaead) execAdFunc() <span class="cov8" title="1">{
additionalData := s.additionalData()
s.adlen = len(additionalData)
writePadding(s.poly, additionalData)
}</span>
func newCipherReader(r io.Reader, key, nonce []byte, f AdditionalFunc) (*streamReader, error) <span class="cov8" title="1">{
if len(key) != rabbitio.KeyLen </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidKey
}</span>
<span class="cov8" title="1">if len(nonce) != rabbitio.IVXLen && len(nonce) != 0 </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidIVX
}</span>
<span class="cov8" title="1">v := &streamReader{
ie: makeioaead(key, nonce, f),
read: r,
buff: []byte{},
tagc: make([]byte, 16),
temp: make([]byte, 16),
}
v.cip, _ = rabbitio.NewCipher(v.ie.key, v.ie.nonce)
return v, nil</span>
}
// NewStreamReader returns streamReader data type, this reader open() and read aead
// ciphertext which have 16-byte poly1305 tag overhead.
// read data cannot be authenticated until underlying reader returns EOF
// so you should use this reader only if you can undo your read.
// AdFunc will be triggered at first call to read method
func NewStreamReader(r io.Reader, key, nonce []byte, f AdditionalFunc) (*streamReader, error) <span class="cov8" title="1">{
return newCipherReader(r, key, nonce, f)
}</span>
// NewStreamWriter returns streamWriter data type, this writer sale() and write aead
// plaintext which have 16-byte poly1305 tag overhead, running Close() is necessary
// in order to calculate and write tag at the end of the write.
// AdFunc will be triggered at first call to write method
func NewStreamWriter(w io.Writer, key, nonce []byte, f AdditionalFunc) (*streamWriter, error) <span class="cov8" title="1">{
return newChipherWriter(w, key, nonce, f)
}</span>
func newChipherWriter(w io.Writer, key, nonce []byte, f AdditionalFunc) (*streamWriter, error) <span class="cov8" title="1">{
if len(key) != rabbitio.KeyLen </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidKey
}</span>
<span class="cov8" title="1">if len(nonce) != rabbitio.IVXLen && len(nonce) != 0 </span><span class="cov0" title="0">{
return nil, rabbitio.ErrInvalidIVX
}</span>
<span class="cov8" title="1">v := &streamWriter{
ie: makeioaead(key, nonce, f),
plainWriter: w,
}
v.writer, _ = rabbitio.NewWriterCipher(
v.ie.key, v.ie.nonce,
io.MultiWriter(w, v.ie.poly),
)
return v, nil</span>
}
func (r *streamReader) readTo(b []byte) (int, error) <span class="cov8" title="1">{
var n int
if len(r.buff) > 0 </span><span class="cov8" title="1">{
return r.copyBuff(b), nil
}</span>
<span class="cov8" title="1">sr, err := r.readBuff()
if err != nil </span><span class="cov8" title="1">{
if err == io.EOF </span><span class="cov8" title="1">{
n = r.copyUntil(b, sr)
return n, r.verify()
}</span>
<span class="cov8" title="1">return n, err</span>
}
<span class="cov8" title="1">return r.copyUntil(b, sr), err</span>
}
// Read reads and open ciphertext.
// read data is unreliable until underlying reader returns EOF
// after that Read return EOF or ErrAuthMsg if integrity of data has been compromised.
// in such a case, you need to unread data. a simple demonstration would be to delete
// or truncate the file if ErrAuthMsg is returned
func (r *streamReader) Read(b []byte) (int, error) <span class="cov8" title="1">{
if len(b) <= 16 </span><span class="cov8" title="1">{
return r.readTo(b)
}</span>
<span class="cov8" title="1">n := 0
for </span><span class="cov8" title="1">{
if n+16 > len(b) </span><span class="cov8" title="1">{
sr, err := r.readTo(b[n:])
n += sr
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
<span class="cov0" title="0">break</span>
}
<span class="cov8" title="1">sr, err := r.readTo(b[n : n+16])
n += sr
if err != nil </span><span class="cov8" title="1">{
return n, err
}</span>
}
<span class="cov0" title="0">return n, nil</span>
}
func (r *streamReader) verify() error <span class="cov8" title="1">{
r.ie.ioPaddingTo(r.nwr)
if r.ie.poly.Verify(r.tagc) </span><span class="cov8" title="1">{
return io.EOF
}</span>
<span class="cov8" title="1">return ErrAuthMsg</span>
}
func (r *streamReader) copyUntil(b []byte, sr int) int <span class="cov8" title="1">{
n := copy(b, r.buff[:sr])
r.buff = r.buff[n:]
r.nwr += n
return n
}</span>
func (r *streamReader) copyBuff(b []byte) int <span class="cov8" title="1">{
n := copy(b, r.buff)
r.buff = r.buff[n:]
r.nwr += n
return n
}</span>
func (r *streamReader) readBuff() (int, error) <span class="cov8" title="1">{
if !r.firstRead </span><span class="cov8" title="1">{
r.ie.execAdFunc()
_, err := io.ReadFull(r.read, r.temp)
if err != nil </span><span class="cov8" title="1">{
return 0, err
}</span>
<span class="cov8" title="1">r.firstRead = true</span>
}
<span class="cov8" title="1">var buff = make([]byte, 16)
n, err := r.read.Read(buff)
if err != nil </span><span class="cov8" title="1">{
return 0, err
}</span>
<span class="cov8" title="1">if n > len(buff) </span><span class="cov0" title="0">{
return 0, errunderio
}</span>
<span class="cov8" title="1">copy(r.tagc, append(r.temp[n:], buff[:n]...))
r.buff = append(r.buff, r.temp[:n]...)
r.buffAndXor()
if n < 16 </span><span class="cov8" title="1">{
return n, err
}</span>
<span class="cov8" title="1">copy(r.temp, buff)
return n, err</span>
}
func (r *streamReader) buffAndXor() <span class="cov8" title="1">{
r.ie.poly.Write(r.buff)
r.cip.XORKeyStream(r.buff, r.buff)
}</span>
// Write writes plaintext data, in order to calculate and write tag
// at the end of the write, running Close() is necessary
func (w *streamWriter) Write(b []byte) (int, error) <span class="cov8" title="1">{
if !w.firstWrite </span><span class="cov8" title="1">{
w.ie.execAdFunc()
w.firstWrite = true
}</span>
<span class="cov8" title="1">n, err := w.writer.Write(b)
if err != nil </span><span class="cov0" title="0">{
return n, err
}</span>
<span class="cov8" title="1">w.nwr += n
return n, err</span>
}
func (p *ioaead) ioPaddingTo(nb int) <span class="cov8" title="1">{
if rem := nb % 16; rem != 0 </span><span class="cov8" title="1">{
var buf [16]byte
padLen := 16 - rem
p.poly.Write(buf[:padLen])
}</span>
<span class="cov8" title="1">writeUint64(p.poly, p.adlen)
writeUint64(p.poly, nb)</span>
}
// Close calculate and write poly1305 tag before closing the writer
// if underlying writer does not have a Close() method, Close only
// calculate and write poly1305 tag
func (w *streamWriter) Close() error <span class="cov8" title="1">{
w.ie.ioPaddingTo(w.nwr)
if _, err := w.plainWriter.Write(w.ie.poly.Sum(nil)); err != nil </span><span class="cov0" title="0">{
return err
}</span>
<span class="cov8" title="1">if c, ok := w.plainWriter.(io.Closer); ok </span><span class="cov0" title="0">{
return c.Close()
}</span>
<span class="cov8" title="1">return nil</span>
}
</pre>
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