113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/port/wstring_convert.h"
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char disable_linker_warning_about_empty_file_wstring_convert_cpp TD_UNUSED;
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#if TD_PORT_WINDOWS
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#include "td/utils/utf8.h"
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#include <cwchar>
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namespace td {
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Result<std::wstring> to_wstring(CSlice slice) {
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if (!check_utf8(slice)) {
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return Status::Error("Wrong encoding");
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}
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size_t wstring_len = utf8_utf16_length(slice);
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std::wstring result(wstring_len, static_cast<wchar_t>(0));
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if (wstring_len) {
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wchar_t *res = &result[0];
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for (size_t i = 0; i < slice.size();) {
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unsigned int a = static_cast<unsigned char>(slice[i++]);
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if (a >= 0x80) {
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unsigned int b = static_cast<unsigned char>(slice[i++]);
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if (a >= 0xe0) {
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unsigned int c = static_cast<unsigned char>(slice[i++]);
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if (a >= 0xf0) {
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unsigned int d = static_cast<unsigned char>(slice[i++]);
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unsigned int val = ((a & 0x07) << 18) + ((b & 0x3f) << 12) + ((c & 0x3f) << 6) + (d & 0x3f) - 0x10000;
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*res++ = static_cast<wchar_t>(0xD800 + (val >> 10));
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*res++ = static_cast<wchar_t>(0xDC00 + (val & 0x3ff));
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} else {
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*res++ = static_cast<wchar_t>(((a & 0x0f) << 12) + ((b & 0x3f) << 6) + (c & 0x3f));
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}
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} else {
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*res++ = static_cast<wchar_t>(((a & 0x1f) << 6) + (b & 0x3f));
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}
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} else {
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*res++ = static_cast<wchar_t>(a);
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}
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}
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CHECK(res == &result[0] + wstring_len);
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}
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return result;
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}
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Result<string> from_wstring(const wchar_t *begin, size_t size) {
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size_t result_len = 0;
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for (size_t i = 0; i < size; i++) {
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unsigned int cur = begin[i];
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if ((cur & 0xF800) == 0xD800) {
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if (i < size) {
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unsigned int next = begin[++i];
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if ((next & 0xFC00) == 0xDC00 && (cur & 0x400) == 0) {
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result_len += 4;
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continue;
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}
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}
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return Status::Error("Wrong encoding");
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}
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result_len += 1 + (cur >= 0x80) + (cur >= 0x800);
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}
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std::string result(result_len, '\0');
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if (result_len) {
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char *res = &result[0];
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for (size_t i = 0; i < size; i++) {
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unsigned int cur = begin[i];
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// TODO conversion unsigned int -> signed char is implementation defined
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if (cur <= 0x7f) {
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*res++ = static_cast<char>(cur);
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} else if (cur <= 0x7ff) {
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*res++ = static_cast<char>(0xc0 | (cur >> 6));
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*res++ = static_cast<char>(0x80 | (cur & 0x3f));
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} else if ((cur & 0xF800) != 0xD800) {
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*res++ = static_cast<char>(0xe0 | (cur >> 12));
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*res++ = static_cast<char>(0x80 | ((cur >> 6) & 0x3f));
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*res++ = static_cast<char>(0x80 | (cur & 0x3f));
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} else {
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unsigned int next = begin[++i];
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unsigned int val = ((cur - 0xD800) << 10) + next - 0xDC00 + 0x10000;
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*res++ = static_cast<char>(0xf0 | (val >> 18));
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*res++ = static_cast<char>(0x80 | ((val >> 12) & 0x3f));
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*res++ = static_cast<char>(0x80 | ((val >> 6) & 0x3f));
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*res++ = static_cast<char>(0x80 | (val & 0x3f));
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}
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}
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}
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return result;
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}
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Result<string> from_wstring(const std::wstring &str) {
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return from_wstring(str.data(), str.size());
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}
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Result<string> from_wstring(const wchar_t *begin) {
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return from_wstring(begin, std::wcslen(begin));
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}
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} // namespace td
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#endif
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