/usr/share/gocode/src/github.com/paulrosania/go-charset/charset/iconv/iconv.go is in golang-github-paulrosania-go-charset-dev 0.0~git20151028.0.621bb39-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | // The iconv package provides an interface to the GNU iconv character set
// conversion library (see http://www.gnu.org/software/libiconv/).
// It automatically registers all the character sets with the charset package,
// so it is usually used simply for the side effects of importing it.
// Example:
// import (
// "go-charset.googlecode.com/hg/charset"
// _ "go-charset.googlecode.com/hg/charset/iconv"
// )
package iconv
//#cgo darwin LDFLAGS: -liconv
//#include <stdlib.h>
//#include <iconv.h>
//#include <errno.h>
//iconv_t iconv_open_error = (iconv_t)-1;
//size_t iconv_error = (size_t)-1;
import "C"
import (
"errors"
"fmt"
"github.com/paulrosania/go-charset/charset"
"runtime"
"strings"
"syscall"
"unicode/utf8"
"unsafe"
)
type iconvTranslator struct {
cd C.iconv_t
invalid rune
scratch []byte
}
func canonicalChar(c rune) rune {
if c >= 'a' && c <= 'z' {
return c - 'a' + 'A'
}
return c
}
func canonicalName(s string) string {
return strings.Map(canonicalChar, s)
}
func init() {
charset.Register(iconvFactory{})
}
type iconvFactory struct {
}
func (iconvFactory) TranslatorFrom(name string) (charset.Translator, error) {
return Translator("UTF-8", name, utf8.RuneError)
}
func (iconvFactory) TranslatorTo(name string) (charset.Translator, error) {
// BUG This is wrong. The target character set may not be ASCII
// compatible. There's no easy solution to this other than
// removing the offending code point.
return Translator(name, "UTF-8", '?')
}
// Translator returns a Translator that translates between
// the named character sets. When an invalid multibyte
// character is found, the bytes in invalid are substituted instead.
func Translator(toCharset, fromCharset string, invalid rune) (charset.Translator, error) {
cto, cfrom := C.CString(toCharset), C.CString(fromCharset)
cd, err := C.iconv_open(cto, cfrom)
C.free(unsafe.Pointer(cfrom))
C.free(unsafe.Pointer(cto))
if cd == C.iconv_open_error {
if err == syscall.EINVAL {
return nil, errors.New("iconv: conversion not supported")
}
return nil, err
}
t := &iconvTranslator{cd: cd, invalid: invalid}
runtime.SetFinalizer(t, func(*iconvTranslator) {
C.iconv_close(cd)
})
return t, nil
}
func (iconvFactory) Names() []string {
all := aliases()
names := make([]string, 0, len(all))
for name, aliases := range all {
if aliases[0] == name {
names = append(names, name)
}
}
return names
}
func (iconvFactory) Info(name string) *charset.Charset {
name = strings.ToLower(name)
all := aliases()
a, ok := all[name]
if !ok {
return nil
}
return &charset.Charset{
Name: name,
Aliases: a,
}
}
func (p *iconvTranslator) Translate(data []byte, eof bool) (rn int, rd []byte, rerr error) {
n := 0
p.scratch = p.scratch[:0]
for len(data) > 0 {
p.scratch = ensureCap(p.scratch, len(p.scratch)+len(data)*utf8.UTFMax)
cData := (*C.char)(unsafe.Pointer(&data[:1][0]))
nData := C.size_t(len(data))
ns := len(p.scratch)
cScratch := (*C.char)(unsafe.Pointer(&p.scratch[ns : ns+1][0]))
nScratch := C.size_t(cap(p.scratch) - ns)
r, err := C.iconv(p.cd, &cData, &nData, &cScratch, &nScratch)
p.scratch = p.scratch[0 : cap(p.scratch)-int(nScratch)]
n += len(data) - int(nData)
data = data[len(data)-int(nData):]
if r != C.iconv_error || err == nil {
return n, p.scratch, nil
}
switch err := err.(syscall.Errno); err {
case C.EILSEQ:
// invalid multibyte sequence - skip one byte and continue
p.scratch = appendRune(p.scratch, p.invalid)
n++
data = data[1:]
case C.EINVAL:
// incomplete multibyte sequence
return n, p.scratch, nil
case C.E2BIG:
// output buffer not large enough; try again with larger buffer.
p.scratch = ensureCap(p.scratch, cap(p.scratch)+utf8.UTFMax)
default:
panic(fmt.Sprintf("unexpected error code: %v", err))
}
}
return n, p.scratch, nil
}
// ensureCap returns s with a capacity of at least n bytes.
// If cap(s) < n, then it returns a new copy of s with the
// required capacity.
func ensureCap(s []byte, n int) []byte {
if n <= cap(s) {
return s
}
// logic adapted from appendslice1 in runtime
m := cap(s)
if m == 0 {
m = n
} else {
for {
if m < 1024 {
m += m
} else {
m += m / 4
}
if m >= n {
break
}
}
}
t := make([]byte, len(s), m)
copy(t, s)
return t
}
func appendRune(buf []byte, r rune) []byte {
n := len(buf)
buf = ensureCap(buf, n+utf8.UTFMax)
nu := utf8.EncodeRune(buf[n:n+utf8.UTFMax], r)
return buf[0 : n+nu]
}
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