Unicode.h

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/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
 * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */
 
#pragma once
 
#include "arch/ArchString.h"
#include "common/Common.h"
#include <string>


class Unicode
{
public:



  static bool isUTF8(const std::string &);


  static std::string UTF8ToUCS2(const std::string &, bool *errors = nullptr);


  static std::string UTF8ToUCS4(const std::string &, bool *errors = nullptr);


  static std::string UTF8ToUTF16(const std::string &, bool *errors = nullptr);


  static std::string UTF8ToUTF32(const std::string &, bool *errors = nullptr);


  static std::string UTF8ToText(const std::string &, bool *errors = nullptr);


  static std::string UCS2ToUTF8(const std::string_view &, bool *errors = nullptr);


  static std::string UCS4ToUTF8(const std::string_view &, bool *errors = nullptr);


  static std::string UTF16ToUTF8(const std::string_view &, bool *errors = nullptr);


  static std::string UTF32ToUTF8(const std::string_view &, bool *errors = nullptr);


  static std::string textToUTF8(
      const std::string &, bool *errors = nullptr,
      ArchString::EWideCharEncoding encoding = ArchString::EWideCharEncoding::kPlatformDetermined
  );

 
private:
  // convert UTF8 to wchar_t string (using whatever encoding is native
  // to the platform).  caller must delete[] the returned string.  the
  // string is *not* nul terminated;  the length (in characters) is
  // returned in size.
  static wchar_t *UTF8ToWideChar(const std::string &, uint32_t &size, bool *errors);
 
  // convert nul terminated wchar_t string (in platform's native
  // encoding) to UTF8.
  static std::string wideCharToUTF8(
      const wchar_t *, uint32_t size, bool *errors,
      ArchString::EWideCharEncoding encoding = ArchString::EWideCharEncoding::kPlatformDetermined
  );
 
  // internal conversion to UTF8
  static std::string doUCS2ToUTF8(const uint8_t *src, uint32_t n, bool *errors);
  static std::string doUCS4ToUTF8(const uint8_t *src, uint32_t n, bool *errors);
  static std::string doUTF16ToUTF8(const uint8_t *src, uint32_t n, bool *errors);
  static std::string doUTF32ToUTF8(const uint8_t *src, uint32_t n, bool *errors);
 
  // convert characters to/from UTF8
  static uint32_t fromUTF8(const uint8_t *&src, uint32_t &size);
  static void toUTF8(std::string &dst, uint32_t c, bool *errors);
 
private:
  static uint32_t s_invalid;
  static uint32_t s_replacement;
};