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- // Copyright (c) 2011 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef BASE_STRINGS_UTF_STRING_CONVERSIONS_H_
- #define BASE_STRINGS_UTF_STRING_CONVERSIONS_H_
- #include <stddef.h>
- #include <string>
- #include "base/base_export.h"
- #include "base/strings/string_piece.h"
- #include "build/build_config.h"
- namespace base {
- // These convert between UTF-8, -16, and -32 strings. They are potentially slow,
- // so avoid unnecessary conversions. The low-level versions return a boolean
- // indicating whether the conversion was 100% valid. In this case, it will still
- // do the best it can and put the result in the output buffer. The versions that
- // return strings ignore this error and just return the best conversion
- // possible.
- BASE_EXPORT bool WideToUTF8(const wchar_t* src, size_t src_len,
- std::string* output);
- [[nodiscard]] BASE_EXPORT std::string WideToUTF8(WStringPiece wide);
- BASE_EXPORT bool UTF8ToWide(const char* src, size_t src_len,
- std::wstring* output);
- [[nodiscard]] BASE_EXPORT std::wstring UTF8ToWide(StringPiece utf8);
- BASE_EXPORT bool WideToUTF16(const wchar_t* src,
- size_t src_len,
- std::u16string* output);
- [[nodiscard]] BASE_EXPORT std::u16string WideToUTF16(WStringPiece wide);
- BASE_EXPORT bool UTF16ToWide(const char16_t* src,
- size_t src_len,
- std::wstring* output);
- [[nodiscard]] BASE_EXPORT std::wstring UTF16ToWide(StringPiece16 utf16);
- BASE_EXPORT bool UTF8ToUTF16(const char* src,
- size_t src_len,
- std::u16string* output);
- [[nodiscard]] BASE_EXPORT std::u16string UTF8ToUTF16(StringPiece utf8);
- BASE_EXPORT bool UTF16ToUTF8(const char16_t* src,
- size_t src_len,
- std::string* output);
- [[nodiscard]] BASE_EXPORT std::string UTF16ToUTF8(StringPiece16 utf16);
- // This converts an ASCII string, typically a hardcoded constant, to a UTF16
- // string.
- [[nodiscard]] BASE_EXPORT std::u16string ASCIIToUTF16(StringPiece ascii);
- // Converts to 7-bit ASCII by truncating. The result must be known to be ASCII
- // beforehand.
- [[nodiscard]] BASE_EXPORT std::string UTF16ToASCII(StringPiece16 utf16);
- #if defined(WCHAR_T_IS_UTF16)
- // This converts an ASCII string, typically a hardcoded constant, to a wide
- // string.
- [[nodiscard]] BASE_EXPORT std::wstring ASCIIToWide(StringPiece ascii);
- // Converts to 7-bit ASCII by truncating. The result must be known to be ASCII
- // beforehand.
- [[nodiscard]] BASE_EXPORT std::string WideToASCII(WStringPiece wide);
- #endif // defined(WCHAR_T_IS_UTF16)
- // The conversion functions in this file should not be used to convert string
- // literals. Instead, the corresponding prefixes (e.g. u"" for UTF16 or L"" for
- // Wide) should be used. Deleting the overloads here catches these cases at
- // compile time.
- template <size_t N>
- std::u16string WideToUTF16(const wchar_t (&str)[N]) {
- static_assert(N == 0, "Error: Use the u\"...\" prefix instead.");
- return std::u16string();
- }
- template <size_t N>
- std::u16string UTF8ToUTF16(const char (&str)[N]) {
- static_assert(N == 0, "Error: Use the u\"...\" prefix instead.");
- return std::u16string();
- }
- template <size_t N>
- std::u16string ASCIIToUTF16(const char (&str)[N]) {
- static_assert(N == 0, "Error: Use the u\"...\" prefix instead.");
- return std::u16string();
- }
- // Mutable character arrays are usually only populated during runtime. Continue
- // to allow this conversion.
- template <size_t N>
- std::u16string ASCIIToUTF16(char (&str)[N]) {
- return ASCIIToUTF16(StringPiece(str));
- }
- } // namespace base
- #endif // BASE_STRINGS_UTF_STRING_CONVERSIONS_H_
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