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// This file is https://github.com/orofarne/gowchar/blob/master/gowchar.go
//
// It was vendored inline to work around CGO limitations that don't allow C types
// to directly cross package API boundaries.
//
// The vendored file is licensed under the 3-clause BSD license, according to:
// https://github.com/orofarne/gowchar/blob/master/LICENSE
// +build !ios
// +build linux darwin windows
package hid
/*
#include <wchar.h>
const size_t SIZEOF_WCHAR_T = sizeof(wchar_t);
void gowchar_set (wchar_t *arr, int pos, wchar_t val)
{
arr[pos] = val;
}
wchar_t gowchar_get (wchar_t *arr, int pos)
{
return arr[pos];
}
*/
import "C"
import (
"fmt"
"unicode/utf16"
"unicode/utf8"
)
var sizeofWcharT C.size_t = C.size_t(C.SIZEOF_WCHAR_T)
func stringToWcharT(s string) (*C.wchar_t, C.size_t) {
switch sizeofWcharT {
case 2:
return stringToWchar2(s) // Windows
case 4:
return stringToWchar4(s) // Unix
default:
panic(fmt.Sprintf("Invalid sizeof(wchar_t) = %v", sizeofWcharT))
}
}
func wcharTToString(s *C.wchar_t) (string, error) {
switch sizeofWcharT {
case 2:
return wchar2ToString(s) // Windows
case 4:
return wchar4ToString(s) // Unix
default:
panic(fmt.Sprintf("Invalid sizeof(wchar_t) = %v", sizeofWcharT))
}
}
func wcharTNToString(s *C.wchar_t, size C.size_t) (string, error) {
switch sizeofWcharT {
case 2:
return wchar2NToString(s, size) // Windows
case 4:
return wchar4NToString(s, size) // Unix
default:
panic(fmt.Sprintf("Invalid sizeof(wchar_t) = %v", sizeofWcharT))
}
}
// Windows
func stringToWchar2(s string) (*C.wchar_t, C.size_t) {
var slen int
s1 := s
for len(s1) > 0 {
r, size := utf8.DecodeRuneInString(s1)
if er, _ := utf16.EncodeRune(r); er == '\uFFFD' {
slen += 1
} else {
slen += 2
}
s1 = s1[size:]
}
slen++ // \0
res := C.malloc(C.size_t(slen) * sizeofWcharT)
var i int
for len(s) > 0 {
r, size := utf8.DecodeRuneInString(s)
if r1, r2 := utf16.EncodeRune(r); r1 != '\uFFFD' {
C.gowchar_set((*C.wchar_t)(res), C.int(i), C.wchar_t(r1))
i++
C.gowchar_set((*C.wchar_t)(res), C.int(i), C.wchar_t(r2))
i++
} else {
C.gowchar_set((*C.wchar_t)(res), C.int(i), C.wchar_t(r))
i++
}
s = s[size:]
}
C.gowchar_set((*C.wchar_t)(res), C.int(slen-1), C.wchar_t(0)) // \0
return (*C.wchar_t)(res), C.size_t(slen)
}
// Unix
func stringToWchar4(s string) (*C.wchar_t, C.size_t) {
slen := utf8.RuneCountInString(s)
slen++ // \0
res := C.malloc(C.size_t(slen) * sizeofWcharT)
var i int
for len(s) > 0 {
r, size := utf8.DecodeRuneInString(s)
C.gowchar_set((*C.wchar_t)(res), C.int(i), C.wchar_t(r))
s = s[size:]
i++
}
C.gowchar_set((*C.wchar_t)(res), C.int(slen-1), C.wchar_t(0)) // \0
return (*C.wchar_t)(res), C.size_t(slen)
}
// Windows
func wchar2ToString(s *C.wchar_t) (string, error) {
var i int
var res string
for {
ch := C.gowchar_get(s, C.int(i))
if ch == 0 {
break
}
r := rune(ch)
i++
if !utf16.IsSurrogate(r) {
if !utf8.ValidRune(r) {
err := fmt.Errorf("Invalid rune at position %v", i)
return "", err
}
res += string(r)
} else {
ch2 := C.gowchar_get(s, C.int(i))
r2 := rune(ch2)
r12 := utf16.DecodeRune(r, r2)
if r12 == '\uFFFD' {
err := fmt.Errorf("Invalid surrogate pair at position %v", i-1)
return "", err
}
res += string(r12)
i++
}
}
return res, nil
}
// Unix
func wchar4ToString(s *C.wchar_t) (string, error) {
var i int
var res string
for {
ch := C.gowchar_get(s, C.int(i))
if ch == 0 {
break
}
r := rune(ch)
if !utf8.ValidRune(r) {
err := fmt.Errorf("Invalid rune at position %v", i)
return "", err
}
res += string(r)
i++
}
return res, nil
}
// Windows
func wchar2NToString(s *C.wchar_t, size C.size_t) (string, error) {
var i int
var res string
N := int(size)
for i < N {
ch := C.gowchar_get(s, C.int(i))
if ch == 0 {
break
}
r := rune(ch)
i++
if !utf16.IsSurrogate(r) {
if !utf8.ValidRune(r) {
err := fmt.Errorf("Invalid rune at position %v", i)
return "", err
}
res += string(r)
} else {
if i >= N {
err := fmt.Errorf("Invalid surrogate pair at position %v", i-1)
return "", err
}
ch2 := C.gowchar_get(s, C.int(i))
r2 := rune(ch2)
r12 := utf16.DecodeRune(r, r2)
if r12 == '\uFFFD' {
err := fmt.Errorf("Invalid surrogate pair at position %v", i-1)
return "", err
}
res += string(r12)
i++
}
}
return res, nil
}
// Unix
func wchar4NToString(s *C.wchar_t, size C.size_t) (string, error) {
var i int
var res string
N := int(size)
for i < N {
ch := C.gowchar_get(s, C.int(i))
r := rune(ch)
if !utf8.ValidRune(r) {
err := fmt.Errorf("Invalid rune at position %v", i)
return "", err
}
res += string(r)
i++
}
return res, nil
}
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