// 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 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 }