1 // Copyright 2021 The Dawn Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "common/WindowsUtils.h"
16
17 #include "common/windows_with_undefs.h"
18
19 #include <memory>
20
WCharToUTF8(const wchar_t * input)21 std::string WCharToUTF8(const wchar_t* input) {
22 // The -1 argument asks WideCharToMultiByte to use the null terminator to know the size of
23 // input. It will return a size that includes the null terminator.
24 int requiredSize = WideCharToMultiByte(CP_UTF8, 0, input, -1, nullptr, 0, nullptr, nullptr);
25
26 // When we can use C++17 this can be changed to use string.data() instead.
27 std::unique_ptr<char[]> result = std::make_unique<char[]>(requiredSize);
28 WideCharToMultiByte(CP_UTF8, 0, input, -1, result.get(), requiredSize, nullptr, nullptr);
29
30 // This will allocate the returned std::string and then destroy result.
31 return std::string(result.get(), result.get() + (requiredSize - 1));
32 }
33
UTF8ToWStr(const char * input)34 std::wstring UTF8ToWStr(const char* input) {
35 // The -1 argument asks MultiByteToWideChar to use the null terminator to know the size of
36 // input. It will return a size that includes the null terminator.
37 int requiredSize = MultiByteToWideChar(CP_UTF8, 0, input, -1, nullptr, 0);
38
39 // When we can use C++17 this can be changed to use string.data() instead.
40 std::unique_ptr<wchar_t[]> result = std::make_unique<wchar_t[]>(requiredSize);
41 MultiByteToWideChar(CP_UTF8, 0, input, -1, result.get(), requiredSize);
42
43 // This will allocate the returned std::string and then destroy result.
44 return std::wstring(result.get(), result.get() + (requiredSize - 1));
45 }
46