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govis is a reimplementation of vis(3) and unvis(3) specifically made to
be unicode aware. It was specifically rewritten to replace cvis and the
other go vis reimplementation we have in go-mtree.

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2017-02-16 03:08:51 +11:00
commit 91d7ec8c89
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# govis: unicode aware vis(3) encoding implementation
# Copyright (C) 2017 SUSE LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
language: go
notifications:
email: false
go:
- 1.x
- 1.6.x
- 1.7.x
- master
script:
- go test -v ./...

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## `govis` ##
[![Travis CI](https://travis-ci.org/cyphar/govis.svg?branch=master)](https://travis-ci.org/cyphar/govis)
`govis` is a BSD-compatible `vis(3)` and `unvis(3)` encoding implementation
that is unicode aware and written in Go. None of this code comes from the
original BSD code, nor does it come from `go-mtree`'s port of said code.
Because 80s BSD code is not very nice to read.
### License ###
`govis` is licensed under the Apache 2.0 license.
```
govis: unicode aware vis(3) encoding implementation
Copyright (C) 2017 SUSE LLC.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
type VisFlag uint
// vis() has a variety of flags when deciding what encodings to use. While
// mtree only uses one set of flags, implementing them all is necessary in
// order to have compatibility with BSD's vis() and unvis() commands.
const (
VisOctal VisFlag = (1 << iota) // VIS_OCTAL: Use octal \ddd format.
VisCStyle // VIS_CSTYLE: Use \[nrft0..] where appropriate.
VisSpace // VIS_SP: Also encode space.
VisTab // VIS_TAB: Also encode tab.
VisNewline // VIS_NL: Also encode newline.
VisSafe // VIS_SAFE: Encode unsafe characters.
VisNoSlash // VIS_NOSLASH: Inhibit printing '\'.
VisHTTPStyle // VIS_HTTPSTYLE: HTTP-style escape %xx.
VisGlob // VIS_GLOB: Encode glob(3) magics.
visMask VisFlag = (1 << iota) - 1 // Mask of all flags.
VisWhite VisFlag = (VisSpace | VisTab | VisNewline)
)

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
import (
"bytes"
"crypto/rand"
"testing"
)
const DefaultVisFlags = VisWhite | VisOctal | VisGlob
func TestRandomVisUnvis(t *testing.T) {
// Randomly generate N strings.
const N = 100
for i := 0; i < N; i++ {
testBytes := make([]byte, 256)
if n, err := rand.Read(testBytes); n != cap(testBytes) || err != nil {
t.Fatalf("could not read enough bytes: err=%v n=%d", err, n)
}
test := string(testBytes)
for flag := VisFlag(0); flag <= visMask; flag++ {
// VisNoSlash is frankly just a dumb flag, and it is impossible for us
// to actually preserve things in a round-trip.
if flag&VisNoSlash == VisNoSlash {
continue
}
enc, err := Vis(test, flag)
if err != nil {
t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
continue
}
dec, err := Unvis(enc, flag)
if err != nil {
t.Errorf("unexpected error doing unvis(%q, %b): %s", enc, flag, err)
continue
}
if dec != test {
t.Errorf("roundtrip failed: unvis(vis(%q, %b) = %q, %b) = %q", test, flag, enc, flag, dec)
}
}
}
}
func TestRandomVisVisUnvisUnvis(t *testing.T) {
// Randomly generate N strings.
const N = 100
for i := 0; i < N; i++ {
testBytes := make([]byte, 256)
if n, err := rand.Read(testBytes); n != cap(testBytes) || err != nil {
t.Fatalf("could not read enough bytes: err=%v n=%d", err, n)
}
test := string(testBytes)
for flag := VisFlag(0); flag <= visMask; flag++ {
// VisNoSlash is frankly just a dumb flag, and it is impossible for us
// to actually preserve things in a round-trip.
if flag&VisNoSlash == VisNoSlash {
continue
}
enc, err := Vis(test, flag)
if err != nil {
t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
continue
}
enc2, err := Vis(enc, flag)
if err != nil {
t.Errorf("unexpected error doing vis(%q, %b): %s", enc, flag, err)
continue
}
dec, err := Unvis(enc2, flag)
if err != nil {
t.Errorf("unexpected error doing unvis(%q, %b): %s", enc2, flag, err)
continue
}
dec2, err := Unvis(dec, flag)
if err != nil {
t.Errorf("unexpected error doing unvis(%q, %b): %s", dec, flag, err)
continue
}
if dec2 != test {
t.Errorf("roundtrip failed: unvis(unvis(vis(vis(%q) = %q) = %q) = %q, %b) = %q", test, enc, enc2, dec, flag, dec2)
}
}
}
}
func TestVisUnvis(t *testing.T) {
for flag := VisFlag(0); flag <= visMask; flag++ {
// VisNoSlash is frankly just a dumb flag, and it is impossible for us
// to actually preserve things in a round-trip.
if flag&VisNoSlash == VisNoSlash {
continue
}
// Round-trip testing.
for _, test := range []string{
"",
"hello world",
"THIS\\IS_A_TEST1234",
"this.is.a.normal_string",
"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem",
"NetLock_Arany_=Class_Gold=_F\u0151tan\u00fas\u00edtv\u00e1ny.pem",
"T\u00dcB\u0130TAK_UEKAE_K\u00f6k_Sertifika_Hizmet_Sa\u011flay\u0131c\u0131s\u0131_-_S\u00fcr\u00fcm_3.pem",
"hello world [ this string needs=enco ding! ]",
"even \n more encoding necessary\a\a ",
"\024 <-- some more weird characters --> \u4f60\u597d\uff0c\u4e16\u754c",
"\\xff\\n double encoding is also great fun \\x",
"AC_Ra\\M-C\\M--z_Certic\\M-C\\M-!mara_S.A..pem",
"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084",
`z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`,
"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c",
"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb",
`62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`,
"\u9003\"9v1)T798|o;fly jnKX\u0489Be=",
`\M-i\M^@\M^C"9v1)T798|o;fly jnKX\M-R\M^IBe=`,
"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b",
`'3Ze\M-T\M^N|\M-K\M^^l\M-Z\M^]u-Rpct4+Z5b={@_{b`,
"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h",
`1%C3%86%C2%ABTcz+Vda%3F)k1%25%5C%22P%3B%60po%60h`,
} {
enc, err := Vis(test, flag)
if err != nil {
t.Errorf("unexpected error doing vis(%q, %b): %s", test, flag, err)
continue
}
dec, err := Unvis(enc, flag)
if err != nil {
t.Errorf("unexpected error doing unvis(%q, %b): %s", enc, flag, err)
continue
}
if dec != test {
t.Errorf("roundtrip failed: unvis(vis(%q, %b) = %q, %b) = %q", test, flag, enc, flag, dec)
}
}
}
}
func TestByteStrings(t *testing.T) {
// It's important to make sure that we don't mess around with the layout of
// bytes when doing a round-trip. Otherwise we risk outputting visually
// identical but bit-stream non-identical strings (causing much confusion
// when trying to access such files).
for _, test := range [][]byte{
[]byte("This is a man in business suit levitating: \U0001f574"),
{0x7f, 0x17, 0x01, 0x33},
// TODO: Test arbitrary byte streams like the one below. Currently this
// fails because Vis() is messing around with it (converting it
// to a rune and spacing it out).
//{'\xef', '\xae', 'h', '\077', 'k'},
} {
testString := string(test)
enc, err := Vis(testString, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing vis(%q): %s", test, err)
continue
}
dec, err := Unvis(enc, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %s", enc, err)
continue
}
decBytes := []byte(dec)
if dec != testString {
t.Errorf("roundtrip failed [string comparison]: unvis(vis(%q) = %q) = %q", test, enc, dec)
}
if !bytes.Equal(decBytes, test) {
t.Errorf("roundtrip failed [byte comparison]: unvis(vis(%q) = %q) = %q", test, enc, dec)
}
}
}

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
import (
"fmt"
"strconv"
"unicode"
)
// unvisParser stores the current state of the token parser.
type unvisParser struct {
tokens []rune
idx int
flag VisFlag
}
// Next moves the index to the next character.
func (p *unvisParser) Next() {
p.idx++
}
// Peek gets the current token.
func (p *unvisParser) Peek() (rune, error) {
if p.idx >= len(p.tokens) {
return unicode.ReplacementChar, fmt.Errorf("tried to read past end of token list")
}
return p.tokens[p.idx], nil
}
// End returns whether all of the tokens have been consumed.
func (p *unvisParser) End() bool {
return p.idx >= len(p.tokens)
}
func newParser(input string, flag VisFlag) *unvisParser {
return &unvisParser{
tokens: []rune(input),
idx: 0,
flag: flag,
}
}
// While a recursive descent parser is overkill for parsing simple escape
// codes, this is IMO much easier to read than the ugly 80s coroutine code used
// by the original unvis(3) parser. Here's the EBNF for an unvis sequence:
//
// <input> ::= (<rune>)*
// <rune> ::= ("\" <escape-sequence>) | ("%" <escape-hex>) | <plain-rune>
// <plain-rune> ::= any rune
// <escape-sequence> ::= ("x" <escape-hex>) | ("M" <escape-meta>) | ("^" <escape-ctrl) | <escape-cstyle> | <escape-octal>
// <escape-meta> ::= ("-" <escape-meta1>) | ("^" <escape-ctrl>)
// <escape-meta1> ::= any rune
// <escape-ctrl> ::= "?" | any rune
// <escape-cstyle> ::= "\" | "n" | "r" | "b" | "a" | "v" | "t" | "f"
// <escape-hex> ::= [0-9a-f] [0-9a-f]
// <escape-octal> ::= [0-7] ([0-7] ([0-7])?)?
func unvisPlainRune(p *unvisParser) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("plain rune: %c", ch)
}
p.Next()
// XXX: Maybe we should not be converting to runes and then back to strings
// here. Are we sure that the byte-for-byte representation is the
// same? If the bytes change, then using these strings for paths will
// break...
str := string(ch)
return []byte(str), nil
}
func unvisEscapeCStyle(p *unvisParser) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("escape hex: %s", err)
}
output := ""
switch ch {
case 'n':
output = "\n"
case 'r':
output = "\r"
case 'b':
output = "\b"
case 'a':
output = "\x07"
case 'v':
output = "\v"
case 't':
output = "\t"
case 'f':
output = "\f"
case 's':
output = " "
case 'E':
output = "\x1b"
case '\n':
// Hidden newline.
case '$':
// Hidden marker.
default:
// XXX: We should probably allow falling through and return "\" here...
return nil, fmt.Errorf("escape cstyle: unknown escape character: %q", ch)
}
p.Next()
return []byte(output), nil
}
func unvisEscapeDigits(p *unvisParser, base int, force bool) ([]byte, error) {
var code int
for i := int(0xFF); i > 0; i /= base {
ch, err := p.Peek()
if err != nil {
if !force && i != 0xFF {
break
}
return nil, fmt.Errorf("escape base %d: %s", base, err)
}
digit, err := strconv.ParseInt(string(ch), base, 8)
if err != nil {
if !force && i != 0xFF {
break
}
return nil, fmt.Errorf("escape base %d: could not parse digit: %s", base, err)
}
code = (code * base) + int(digit)
p.Next()
}
if code > unicode.MaxLatin1 {
return nil, fmt.Errorf("escape base %d: code %q outside latin-1 encoding", base, code)
}
char := byte(code & 0xFF)
return []byte{char}, nil
}
func unvisEscapeCtrl(p *unvisParser, mask byte) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("escape ctrl: %s", err)
}
if ch > unicode.MaxLatin1 {
return nil, fmt.Errorf("escape ctrl: code %q outside latin-1 encoding", ch)
}
char := byte(ch) & 0x1f
if ch == '?' {
char = 0x7f
}
p.Next()
return []byte{mask | char}, nil
}
func unvisEscapeMeta(p *unvisParser) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("escape meta: %s", err)
}
mask := byte(0x80)
switch ch {
case '^':
// The same as "\^..." except we apply a mask.
p.Next()
return unvisEscapeCtrl(p, mask)
case '-':
p.Next()
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("escape meta1: %s", err)
}
if ch > unicode.MaxLatin1 {
return nil, fmt.Errorf("escape meta1: code %q outside latin-1 encoding", ch)
}
// Add mask to character.
p.Next()
return []byte{mask | byte(ch)}, nil
}
return nil, fmt.Errorf("escape meta: unknown escape char: %s", err)
}
func unvisEscapeSequence(p *unvisParser) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("escape sequence: %s", err)
}
switch ch {
case '\\':
p.Next()
return []byte("\\"), nil
case '0', '1', '2', '3', '4', '5', '6', '7':
return unvisEscapeDigits(p, 8, false)
case 'x':
p.Next()
return unvisEscapeDigits(p, 16, true)
case '^':
p.Next()
return unvisEscapeCtrl(p, 0x00)
case 'M':
p.Next()
return unvisEscapeMeta(p)
default:
return unvisEscapeCStyle(p)
}
}
func unvisRune(p *unvisParser) ([]byte, error) {
ch, err := p.Peek()
if err != nil {
return nil, fmt.Errorf("rune: %s", err)
}
switch ch {
case '\\':
p.Next()
return unvisEscapeSequence(p)
case '%':
// % HEX HEX only applies to HTTPStyle encodings.
if p.flag&VisHTTPStyle == VisHTTPStyle {
p.Next()
return unvisEscapeDigits(p, 16, true)
}
fallthrough
default:
return unvisPlainRune(p)
}
}
func unvis(p *unvisParser) (string, error) {
var output []byte
for !p.End() {
ch, err := unvisRune(p)
if err != nil {
return "", fmt.Errorf("input: %s", err)
}
output = append(output, ch...)
}
return string(output), nil
}
// Unvis takes a string formatted with the given Vis flags (though only the
// VisHTTPStyle flag is checked) and output the un-encoded version of the
// encoded string. An error is returned if any escape sequences in the input
// string were invalid.
func Unvis(input string, flag VisFlag) (string, error) {
// TODO: Check all of the VisFlag bits.
p := newParser(input, flag)
output, err := unvis(p)
if err != nil {
return "", fmt.Errorf("unvis: %s", err)
}
if !p.End() {
return "", fmt.Errorf("unvis: trailing characters at end of input")
}
return output, nil
}

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
import (
"testing"
)
func TestUnvisError(t *testing.T) {
for _, test := range []string{
// Octal escape codes allow you to specify invalid byte values.
"\\777",
"\\420\\322\\455",
"\\652\\233",
} {
got, err := Unvis(test, DefaultVisFlags)
if err == nil {
t.Errorf("expected unvis(%q) to give an error, got %q", test, got)
}
}
}
func TestUnvisCStyleEscape(t *testing.T) {
for _, test := range []struct {
input string
expected string
}{
{"", ""},
{"\\n\\v\\t\\s", "\n\v\t "},
{"\\\\n\\tt", "\\n\tt"},
{"\\b", "\b"},
{"\\r\\b\\n", "\r\b\n"},
{"\\a\\a\\b", "\x07\x07\b"},
{"\\f\\s\\E", "\f \x1b"},
// Hidden markers. They actually aren't generated by vis(3) but for
// some reason, they're supported...
{"test\\\ning", "testing"},
{"test\\$\\$ing", "testing"},
} {
got, err := Unvis(test.input, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
continue
}
if got != test.expected {
t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
}
}
}
func TestUnvisMetaEscape(t *testing.T) {
for _, test := range []struct {
input string
expected string
}{
{"", ""},
{"\\M^ ?\\^ ", "\x80?\x00"},
{"\\M- ?\\^?", "\xa0?\x7f"},
{"\\M-x butterfly\\M^?", "\xf8 butterfly\xff"},
{"\\M^X steady-hand \\^& needle", "\x98 steady-hand \x06 needle"},
// TODO: Add some more of these tests, but I need to have some
// secondary source to verify these outputs properly.
} {
got, err := Unvis(test.input, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
continue
}
if got != test.expected {
t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
}
}
}
func TestUnvisOctalEscape(t *testing.T) {
for _, test := range []struct {
input string
expected string
}{
{"", ""},
{"\\1", "\001"},
{"\\01\\02\\3", "\001\002\003"},
{"\\001\\023\\32", "\001\023\032"},
{"this is a test\\0k1\\133", "this is a test\000k1\133"},
{"\\170YET\\01another test\\1\\\\82", "\170YET\001another test\001\\82"},
{"\\177MORE tests\\09a", "\177MORE tests\x009a"},
{"\\\\710more\\1215testing", "\\710more\1215testing"},
// Make sure that decoding unicode works properly, when it's been encoded as single bytes.
{"\\360\\237\\225\\264", "\U0001f574"},
{"T\\303\\234B\\304\\260TAK_UEKAE_K\\303\\266k_Sertifika_Hizmet_Sa\\304\\237lay\\304\\261c\\304\\261s\\304\\261_-_S\\303\\274r\\303\\274m_3.pem", "TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem"},
// Some invalid characters...
{"\\377\\2\\225\\264", "\xff\x02\x95\xb4"},
} {
got, err := Unvis(test.input, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
continue
}
if got != test.expected {
t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
}
}
}
func TestUnvisHexEscape(t *testing.T) {
for _, test := range []struct {
input string
expected string
}{
{"", ""},
{"\\x01", "\x01"},
{"\\x01\\x02\\x7a", "\x01\x02\x7a"},
{"this is a test\\x13\\x52\\x6f", "this is a test\x13\x52\x6f"},
{"\\x170YET\\x01a\\x22nother test\\x11", "\x170YET\x01a\x22nother test\x11"},
{"\\\\x007more\\\\x215testing", "\\x007more\\x215testing"},
// Make sure that decoding unicode works properly, when it's been encoded as single bytes.
{"\\xf0\\x9f\\x95\\xb4", "\U0001f574"},
{"T\\xc3\\x9cB\\xc4\\xb0TAK_UEKAE_K\\xc3\\xb6k_Sertifika_Hizmet_Sa\\xc4\\x9flay\\xc4\\xb1c\\xc4\\xb1s\\xc4\\xb1_-_S\\xc3\\xbcr\\xc3\\xbcm_3.pem", "TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem"},
// Some invalid characters...
{"\\xff\\x02\\x95\\xb4", "\xff\x02\x95\xb4"},
} {
got, err := Unvis(test.input, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %q", test.input, err)
continue
}
if got != test.expected {
t.Errorf("expected unvis(%q) = %q, got %q", test.input, test.expected, got)
}
}
}
func TestUnvisUnicode(t *testing.T) {
// Ensure that unicode strings are not messed up by Unvis.
for _, test := range []string{
"",
"this.is.a.normal_string",
"AC_Raíz_Certicámara_S.A..pem",
"NetLock_Arany_=Class_Gold=_Főtanúsítvány.pem",
"TÜBİTAK_UEKAE_Kök_Sertifika_Hizmet_Sağlayıcısı_-_Sürüm_3.pem",
} {
got, err := Unvis(test, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error doing unvis(%q): %s", test, err)
continue
}
if got != test {
t.Errorf("expected %q to be unchanged, got %q", test, got)
}
}
}

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
import (
"fmt"
"unicode"
)
func isunsafe(ch rune) bool {
return ch == '\b' || ch == '\007' || ch == '\r'
}
func isglob(ch rune) bool {
return ch == '*' || ch == '?' || ch == '[' || ch == '#'
}
// ishttp is defined by RFC 1808.
func ishttp(ch rune) bool {
// RFC1808 does not really consider characters outside of ASCII, so just to
// be safe always treat characters outside the ASCII character set as "not
// HTTP".
if ch > unicode.MaxASCII {
return false
}
return unicode.IsDigit(ch) || unicode.IsLetter(ch) ||
// Safe characters.
ch == '$' || ch == '-' || ch == '_' || ch == '.' || ch == '+' ||
// Extra characters.
ch == '!' || ch == '*' || ch == '\'' || ch == '(' ||
ch == ')' || ch == ','
}
func isgraph(ch rune) bool {
return unicode.IsGraphic(ch) && !unicode.IsSpace(ch) && ch <= unicode.MaxASCII
}
// vis converts a single *byte* into its encoding. While Go supports the
// concept of runes (and thus native utf-8 parsing), in order to make sure that
// the bit-stream will be completely maintained through an Unvis(Vis(...))
// round-trip. The downside is that Vis() will never output unicode -- but on
// the plus side this is actually a benefit on the encoding side (it will
// always work with the simple unvis(3) implementation). It also means that we
// don't have to worry about different multi-byte encodings.
func vis(b byte, flag VisFlag) (string, error) {
// Treat the single-byte character as a rune.
ch := rune(b)
// XXX: This is quite a horrible thing to support.
if flag&VisHTTPStyle == VisHTTPStyle {
if !ishttp(ch) {
return "%" + fmt.Sprintf("%.2X", ch), nil
}
}
// Figure out if the character doesn't need to be encoded. Effectively, we
// encode most "normal" (graphical) characters as themselves unless we have
// been specifically asked not to. Note though that we *ALWAYS* encode
// everything outside ASCII.
// TODO: Switch this to much more logical code.
if ch > unicode.MaxASCII {
/* ... */
} else if flag&VisGlob == VisGlob && isglob(ch) {
/* ... */
} else if isgraph(ch) ||
(flag&VisSpace != VisSpace && ch == ' ') ||
(flag&VisTab != VisTab && ch == '\t') ||
(flag&VisNewline != VisNewline && ch == '\n') ||
(flag&VisSafe != 0 && isunsafe(ch)) {
encoded := string(ch)
if ch == '\\' && flag&VisNoSlash == 0 {
encoded += "\\"
}
return encoded, nil
}
// Try to use C-style escapes first.
if flag&VisCStyle == VisCStyle {
switch ch {
case ' ':
return "\\s", nil
case '\n':
return "\\n", nil
case '\r':
return "\\r", nil
case '\b':
return "\\b", nil
case '\a':
return "\\a", nil
case '\v':
return "\\v", nil
case '\t':
return "\\t", nil
case '\f':
return "\\f", nil
case '\x00':
// Output octal just to be safe.
return "\\000", nil
}
}
// For graphical characters we generate octal output (and also if it's
// being forced by the caller's flags). Also spaces should always be
// encoded as octal.
if flag&VisOctal == VisOctal || isgraph(ch) || ch&0x7f == ' ' {
// Always output three-character octal just to be safe.
return fmt.Sprintf("\\%.3o", ch), nil
}
// Now we have to output meta or ctrl escapes. As far as I can tell, this
// is not actually defined by any standard -- so this logic is basically
// copied from the original vis(3) implementation. Hopefully nobody
// actually relies on this (octal and hex are better).
encoded := ""
if flag&VisNoSlash == 0 {
encoded += "\\"
}
// Meta characters have 0x80 set, but are otherwise identical to control
// characters.
if b&0x80 != 0 {
b &= 0x7f
encoded += "M"
}
if unicode.IsControl(rune(b)) {
encoded += "^"
if b == 0x7f {
encoded += "?"
} else {
encoded += fmt.Sprintf("%c", b+'@')
}
} else {
encoded += fmt.Sprintf("-%c", b)
}
return encoded, nil
}
// Vis encodes the provided string to a BSD-compatible encoding using BSD's
// vis() flags. However, it will correctly handle multi-byte encoding (which is
// not done properly by BSD's vis implementation).
func Vis(src string, flag VisFlag) (string, error) {
if flag&visMask != flag {
return "", fmt.Errorf("vis: flag %q contains unknown or unsupported flags", flag)
}
output := ""
for _, ch := range []byte(src) {
encodedCh, err := vis(ch, flag)
if err != nil {
return "", err
}
output += encodedCh
}
return output, nil
}

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/*
* govis: unicode aware vis(3) encoding implementation
* Copyright (C) 2017 SUSE LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package govis
import (
"testing"
)
func TestVisUnchanged(t *testing.T) {
for _, test := range []struct {
input string
flag VisFlag
}{
{"", DefaultVisFlags},
{"helloworld", DefaultVisFlags},
{"THIS_IS_A_TEST1234", DefaultVisFlags},
{"SomeEncodingsAreCool", DefaultVisFlags},
{"spaces are totally safe", DefaultVisFlags &^ VisSpace},
{"tabs\tare\talso\tsafe!!", DefaultVisFlags &^ VisTab},
{"just\a\atrustme\r\b\b!!", DefaultVisFlags | VisSafe},
} {
enc, err := Vis(test.input, test.flag)
if err != nil {
t.Errorf("unexpected error with %q: %s", test, err)
}
if enc != test.input {
t.Errorf("expected encoding of %q (flag=%q) to be unchanged, got %q", test.input, test.flag, enc)
}
}
}
func TestVisFlags(t *testing.T) {
for _, test := range []struct {
input string
output string
flag VisFlag
}{
// Default
{"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem", "AC_Ra\\M-C\\M--z_Certic\\M-C\\M-!mara_S.A..pem", 0},
{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`, 0},
{"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", "@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", 0},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, 0},
{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly jnKX\M-R\M^IBe=`, 0},
// VisOctal
{"", "", VisOctal},
{"\022", "\\022", VisOctal},
{"\n \t", "\\012\\040\t", VisNewline | VisSpace | VisOctal},
{"\x12\f\a\n\v\b \U00012312", "\\022\\014\\007\n\\013\\010 \\360\\222\\214\\222", VisOctal},
{"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem", "AC_Ra\\303\\255z_Certic\\303\\241mara_S.A..pem", VisOctal},
{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\303\223\302\212nqgh5/t\303\245<86>\302\262kzla\\e^lv\303\237\302\223nv\303\237\302\256a|3}\303\230\302\210\303\226\302\204`, VisOctal},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\303\206\303\2062\302\256\302\267m\303\233\303\203r^\302\277p\303\206u'q\303\273c2\303\260u\302\270\303\235\303\250v\303\277\302\260\303\234\303\202\303\2653\303\233-k\303\262sd4\\p\303\232\302\246\303\223\303\256a<\303\246s{\302\240p\303\260\303\277j\303\240\303\250\302\270\302\270\302\274\303\274b`, VisOctal},
{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\351\200\203"9v1)T798|o;fly jnKX\322\211Be=`, VisOctal},
// VisCStyle
{"\x00 \f \a \n\v\b \r \t\r", "\\000 \\f \\a \n\\v\\b \\r \t\\r", VisCStyle},
{"\t \n\v\b", "\\t \n\\v\\b", VisTab | VisCStyle},
{"\n\v\t ", "\n\\v\t\\s\\s\\s", VisSpace | VisCStyle},
{"\n \n ", "\\n \\n ", VisNewline | VisCStyle},
{"z^i3i$\u00d3\u008anqgh5/t\u00e5<86>\u00b2kzla\\e^lv\u00df\u0093nv\u00df\u00aea|3}\u00d8\u0088\u00d6\u0084", `z^i3i$\M-C\M^S\M-B\M^Jnqgh5/t\M-C\M-%<86>\M-B\M-2kzla\\e^lv\M-C\M^_\M-B\M^Snv\M-C\M^_\M-B\M-.a|3}\M-C\M^X\M-B\M^H\M-C\M^V\M-B\M^D`, VisCStyle},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, VisCStyle},
{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly\sjnKX\M-R\M^IBe=`, VisCStyle | VisSpace},
// VisSpace
{" ", `\040\040`, VisSpace},
{"\t \t", "\t\\040\t", VisSpace},
{"\\040 plenty of characters here ", `\\040\040\040\040plenty\040of\040characters\040here\040\040\040`, VisSpace},
{"Js9L\u00cd\u00b2o?4824y'$|P}FIr%mW /KL9$]~", `Js9L\M-C\M^M\M-B\M-2o?4824y'$|P}FIr%mW\040/KL9$]~`, VisWhite},
{"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h", `1\M-C\M^F\M-B\M-+Tcz+Vda?)k1%\\"P;` + "`po`" + `h`, VisWhite},
{"\u9003\"9v1)T798|o;fly jnKX\u0489Be=", `\M-i\M^@\M^C"9v1)T798|o;fly\040jnKX\M-R\M^IBe=`, VisSpace},
// VisTab
{"\t \v", "\\^I \\^K", VisTab},
{"\t \v", "\\011 \\013", VisTab | VisOctal},
// VisNewline
{"\t\n \v\r\n", "\t\\^J \\^K\\^M\\^J", VisNewline},
{"\t\n \v\r\n", "\t\\012 \\013\\015\\012", VisNewline | VisOctal},
// VisSafe
// VisHTTPStyle
{"\x12\f\a\n\v\b \U00012312", `%12%0C%07%0A%0B%08%20%20%F0%92%8C%92`, VisHTTPStyle},
{"1\u00c6\u00abTcz+Vda?)k1%\\\"P;`po`h", `1%C3%86%C2%ABTcz+Vda%3F)k1%25%5C%22P%3B%60po%60h`, VisHTTPStyle},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_%C3%86%C3%862%C2%AE%C2%B7m%C3%9B%C3%83r%5E%C2%BFp%C3%86u'q%C3%BBc2%C3%B0u%C2%B8%C3%9D%C3%A8v%C3%BF%C2%B0%C3%9C%C3%82%C3%B53%C3%9B-k%C3%B2sd4%5Cp%C3%9A%C2%A6%C3%93%C3%AEa%3C%C3%A6s%7B%C2%A0p%C3%B0%C3%BFj%C3%A0%C3%A8%C2%B8%C2%B8%C2%BC%C3%BCb`, VisHTTPStyle},
{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze%D4%8E%7C%CB%9El%DA%9Du-Rpct4+Z5b%3D%7B%40_%7Bb`, VisHTTPStyle},
// VisGlob
{"cat /proc/**/status | grep '[pid]' ;; # cool code here", `cat /proc/\052\052/status | grep '\133pid]' ;; \043 cool code here`, VisGlob},
{"@?e1xs+.R_Kjo]7s8pgRP:*nXCE4{!c", `@\077e1xs+.R_Kjo]7s8pgRP:\052nXCE4{!c`, VisGlob},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\M-C\M^F\M-C\M^F2\M-B\M-.\M-B\M-7m\M-C\M^[\M-C\M^Cr^\M-B\M-?p\M-C\M^Fu'q\M-C\M-;c2\M-C\M-0u\M-B\M-8\M-C\M^]\M-C\M-(v\M-C\M-?\M-B\M-0\M-C\M^\\M-C\M^B\M-C\M-53\M-C\M^[-k\M-C\M-2sd4\\p\M-C\M^Z\M-B\M-&\M-C\M^S\M-C\M-.a<\M-C\M-&s{\M-B\240p\M-C\M-0\M-C\M-?j\M-C\240\M-C\M-(\M-B\M-8\M-B\M-8\M-B\M-<\M-C\M-<b`, VisGlob},
{"62_\u00c6\u00c62\u00ae\u00b7m\u00db\u00c3r^\u00bfp\u00c6u'q\u00fbc2\u00f0u\u00b8\u00dd\u00e8v\u00ff\u00b0\u00dc\u00c2\u00f53\u00db-k\u00f2sd4\\p\u00da\u00a6\u00d3\u00eea<\u00e6s{\u00a0p\u00f0\u00ffj\u00e0\u00e8\u00b8\u00b8\u00bc\u00fcb", `62_\303\206\303\2062\302\256\302\267m\303\233\303\203r^\302\277p\303\206u'q\303\273c2\303\260u\302\270\303\235\303\250v\303\277\302\260\303\234\303\202\303\2653\303\233-k\303\262sd4\\p\303\232\302\246\303\223\303\256a<\303\246s{\302\240p\303\260\303\277j\303\240\303\250\302\270\302\270\302\274\303\274b`, VisGlob | VisOctal},
{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze\M-T\M^N|\M-K\M^^l\M-Z\M^]u-Rpct4+Z5b={@_{b`, VisGlob},
{"'3Ze\u050e|\u02del\u069du-Rpct4+Z5b={@_{b", `'3Ze\324\216|\313\236l\332\235u-Rpct4+Z5b={@_{b`, VisGlob | VisOctal},
} {
enc, err := Vis(test.input, test.flag)
if err != nil {
t.Errorf("unexpected error with %q: %s", test, err)
}
if enc != test.output {
t.Errorf("expected vis(%q, flag=%b) = %q, got %q", test.input, test.flag, test.output, enc)
}
}
}
func TestVisChanged(t *testing.T) {
for _, test := range []string{
"hello world",
"THIS\\IS_A_TEST1234",
"AC_Ra\u00edz_Certic\u00e1mara_S.A..pem",
} {
enc, err := Vis(test, DefaultVisFlags)
if err != nil {
t.Errorf("unexpected error with %q: %s", test, err)
}
if enc == test {
t.Errorf("expected encoding of %q to be changed", test)
}
}
}