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