/**

 * WinPR: Windows Portable Runtime

 * Unicode Conversion (CRT)

 *

 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 * Copyright 2022 Armin Novak <anovak@thincast.com>

 * Copyright 2022 Thincast Technologies GmbH

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <winpr/config.h>

#include <winpr/assert.h>

#include <errno.h>

#include <wctype.h>

#include <winpr/crt.h>

#include <winpr/error.h>

#include <winpr/print.h>

#ifndef _WIN32

#include "unicode.h"

/**

 * Notes on cross-platform Unicode portability:

 *

 * Unicode has many possible Unicode Transformation Format (UTF) encodings,

 * where some of the most commonly used are UTF-8, UTF-16 and sometimes UTF-32.

 *

 * The number in the UTF encoding name (8, 16, 32) refers to the number of bits

 * per code unit. A code unit is the minimal bit combination that can represent

 * a unit of encoded text in the given encoding. For instance, UTF-8 encodes

 * the English alphabet using 8 bits (or one byte) each, just like in ASCII.

 *

 * However, the total number of code points (values in the Unicode codespace)

 * only fits completely within 32 bits. This means that for UTF-8 and UTF-16,

 * more than one code unit may be required to fully encode a specific value.

 * UTF-8 and UTF-16 are variable-width encodings, while UTF-32 is fixed-width.

 *

 * UTF-8 has the advantage of being backwards compatible with ASCII, and is

 * one of the most commonly used Unicode encoding.

 *

 * UTF-16 is used everywhere in the Windows API. The strategy employed by

 * Microsoft to provide backwards compatibility in their API was to create

 * an ANSI and a Unicode version of the same function, ending with A (ANSI)

 * and W (Wide character, or UTF-16 Unicode). In headers, the original

 * function name is replaced by a macro that defines to either the ANSI

 * or Unicode version based on the definition of the _UNICODE macro.

 *

 * UTF-32 has the advantage of being fixed width, but wastes a lot of space

 * for English text (4x more than UTF-8, 2x more than UTF-16).

 *

 * In C, wide character strings are often defined with the wchar_t type.

 * Many functions are provided to deal with those wide character strings,

 * such as wcslen (strlen equivalent) or wprintf (printf equivalent).

 *

 * This may lead to some confusion, since many of these functions exist

 * on both Windows and Linux, but they are *not* the same!

 *

 * This sample hello world is a good example:

 *

 * #include <wchar.h>

 *

 * wchar_t hello[] = L"Hello, World!\n";

 *

 * int main(int argc, char** argv)

 * {

 *  wprintf(hello);

 *  wprintf(L"sizeof(wchar_t): %d\n", sizeof(wchar_t));

 *  return 0;

 * }

 *

 * There is a reason why the sample prints the size of the wchar_t type:

 * On Windows, wchar_t is two bytes (UTF-16), while on most other systems

 * it is 4 bytes (UTF-32). This means that if you write code on Windows,

 * use L"" to define a string which is meant to be UTF-16 and not UTF-32,

 * you will have a little surprise when trying to port your code to Linux.

 *

 * Since the Windows API uses UTF-16, not UTF-32, WinPR defines the WCHAR

 * type to always be 2-bytes long and uses it instead of wchar_t. Do not

 * ever use wchar_t with WinPR unless you know what you are doing.

 *

 * As for L"", it is unfortunately unusable in a portable way, unless a

 * special option is passed to GCC to define wchar_t as being two bytes.

 * For string constants that must be UTF-16, it is a pain, but they can

 * be defined in a portable way like this:

 *

 * WCHAR hello[] = { 'H','e','l','l','o','\0' };

 *

 * Such strings cannot be passed to native functions like wcslen(), which

 * may expect a different wchar_t size. For this reason, WinPR provides

 * _wcslen, which expects UTF-16 WCHAR strings on all platforms.

 *

 */

/** \deprecated We no longer export this function, see ConvertUtf8ToWChar family of functions for a

 * replacement

 *

 * Conversion to Unicode (UTF-16)

 * MultiByteToWideChar: http://msdn.microsoft.com/en-us/library/windows/desktop/dd319072/

 *

 * cbMultiByte is an input size in bytes (BYTE)

 * cchWideChar is an output size in wide characters (WCHAR)

 *

 * Null-terminated UTF-8 strings:

 *

 * cchWideChar *cannot* be assumed to be cbMultiByte since UTF-8 is variable-width!

 *

 * Instead, obtain the required cchWideChar output size like this:

 * cchWideChar = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) lpMultiByteStr, -1, nullptr, 0);

 *

 * A value of -1 for cbMultiByte indicates that the input string is null-terminated,

 * and the null terminator *will* be processed. The size returned by MultiByteToWideChar

 * will therefore include the null terminator. Equivalent behavior can be obtained by

 * computing the length in bytes of the input buffer, including the null terminator:

 *

 * cbMultiByte = strlen((char*) lpMultiByteStr) + 1;

 *

 * An output buffer of the proper size can then be allocated:

 *

 * lpWideCharStr = (LPWSTR) malloc(cchWideChar * sizeof(WCHAR));

 *

 * Since cchWideChar is an output size in wide characters, the actual buffer size is:

 * (cchWideChar * sizeof(WCHAR)) or (cchWideChar * 2)

 *

 * Finally, perform the conversion:

 *

 * cchWideChar = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) lpMultiByteStr, -1, lpWideCharStr,

 * cchWideChar);

 *

 * The value returned by MultiByteToWideChar corresponds to the number of wide characters written

 * to the output buffer, and should match the value obtained on the first call to

 * MultiByteToWideChar.

 *

 */

#if !defined(WITH_WINPR_DEPRECATED)

static

#endif

    int

    MultiByteToWideChar(UINT CodePage, DWORD dwFlags, LPCSTR lpMultiByteStr, int cbMultiByte,

                        LPWSTR lpWideCharStr, int cchWideChar)

{

  return int_MultiByteToWideChar(CodePage, dwFlags, lpMultiByteStr, cbMultiByte, lpWideCharStr,

                                 cchWideChar);

}

/** \deprecated We no longer export this function, see ConvertWCharToUtf8 family of functions for a

 * replacement

 *

 * Conversion from Unicode (UTF-16)

 * WideCharToMultiByte: http://msdn.microsoft.com/en-us/library/windows/desktop/dd374130/

 *

 * cchWideChar is an input size in wide characters (WCHAR)

 * cbMultiByte is an output size in bytes (BYTE)

 *

 * Null-terminated UTF-16 strings:

 *

 * cbMultiByte *cannot* be assumed to be cchWideChar since UTF-8 is variable-width!

 *

 * Instead, obtain the required cbMultiByte output size like this:

 * cbMultiByte = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR) lpWideCharStr, -1, nullptr, 0, nullptr,

 * nullptr);

 *

 * A value of -1 for cbMultiByte indicates that the input string is null-terminated,

 * and the null terminator *will* be processed. The size returned by WideCharToMultiByte

 * will therefore include the null terminator. Equivalent behavior can be obtained by

 * computing the length in bytes of the input buffer, including the null terminator:

 *

 * cchWideChar = _wcslen((WCHAR*) lpWideCharStr) + 1;

 *

 * An output buffer of the proper size can then be allocated:

 * lpMultiByteStr = (LPSTR) malloc(cbMultiByte);

 *

 * Since cbMultiByte is an output size in bytes, it is the same as the buffer size

 *

 * Finally, perform the conversion:

 *

 * cbMultiByte = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR) lpWideCharStr, -1, lpMultiByteStr,

 * cbMultiByte, nullptr, nullptr);

 *

 * The value returned by WideCharToMultiByte corresponds to the number of bytes written

 * to the output buffer, and should match the value obtained on the first call to

 * WideCharToMultiByte.

 *

 */

#if !defined(WITH_WINPR_DEPRECATED)

static

#endif

    int

    WideCharToMultiByte(UINT CodePage, DWORD dwFlags, LPCWSTR lpWideCharStr, int cchWideChar,

                        LPSTR lpMultiByteStr, int cbMultiByte, LPCSTR lpDefaultChar,

                        LPBOOL lpUsedDefaultChar)

{

  return int_WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr,

                                 cbMultiByte, lpDefaultChar, lpUsedDefaultChar);

}

#endif

/**

 * ConvertToUnicode is a convenience wrapper for MultiByteToWideChar:

 *

 * If the lpWideCharStr parameter for the converted string points to nullptr

 * or if the cchWideChar parameter is set to 0 this function will automatically

 * allocate the required memory which is guaranteed to be null-terminated

 * after the conversion, even if the source c string isn't.

 *

 * If the cbMultiByte parameter is set to -1 the passed lpMultiByteStr must

 * be null-terminated and the required length for the converted string will be

 * calculated accordingly.

 */

#if defined(WITH_WINPR_DEPRECATED)

int ConvertToUnicode(UINT CodePage, DWORD dwFlags, LPCSTR lpMultiByteStr, int cbMultiByte,

                     LPWSTR* lpWideCharStr, int cchWideChar)

{

  int status = 0;

  BOOL allocate = FALSE;

  if (!lpMultiByteStr)

    return 0;

  if (!lpWideCharStr)

    return 0;

  if (cbMultiByte == -1)

  {

    size_t len = strnlen(lpMultiByteStr, INT_MAX);

    if (len >= INT_MAX)

      return 0;

    cbMultiByte = (int)(len + 1);

  }

  if (cchWideChar == 0)

  {

    cchWideChar =

        MultiByteToWideChar(CodePage, dwFlags, lpMultiByteStr, cbMultiByte, nullptr, 0);

    allocate = TRUE;

  }

  else if (!(*lpWideCharStr))

    allocate = TRUE;

  if (cchWideChar < 1)

    return 0;

  if (allocate)

  {

    *lpWideCharStr = (LPWSTR)calloc((size_t)cchWideChar + 1ull, sizeof(WCHAR));

    if (!(*lpWideCharStr))

    {

      // SetLastError(ERROR_INSUFFICIENT_BUFFER);

      return 0;

    }

  }

  status = MultiByteToWideChar(CodePage, dwFlags, lpMultiByteStr, cbMultiByte, *lpWideCharStr,

                               cchWideChar);

  if (status != cchWideChar)

  {

    if (allocate)

    {

      free(*lpWideCharStr);

      *lpWideCharStr = nullptr;

      status = 0;

    }

  }

  return status;

}

#endif

/**

 * ConvertFromUnicode is a convenience wrapper for WideCharToMultiByte:

 *

 * If the lpMultiByteStr parameter for the converted string points to nullptr

 * or if the cbMultiByte parameter is set to 0 this function will automatically

 * allocate the required memory which is guaranteed to be null-terminated

 * after the conversion, even if the source unicode string isn't.

 *

 * If the cchWideChar parameter is set to -1 the passed lpWideCharStr must

 * be null-terminated and the required length for the converted string will be

 * calculated accordingly.

 */

#if defined(WITH_WINPR_DEPRECATED)

int ConvertFromUnicode(UINT CodePage, DWORD dwFlags, LPCWSTR lpWideCharStr, int cchWideChar,

                       LPSTR* lpMultiByteStr, int cbMultiByte, LPCSTR lpDefaultChar,

                       LPBOOL lpUsedDefaultChar)

{

  int status = 0;

  BOOL allocate = FALSE;

  if (!lpWideCharStr)

    return 0;

  if (!lpMultiByteStr)

    return 0;

  if (cchWideChar == -1)

    cchWideChar = (int)(_wcslen(lpWideCharStr) + 1);

  if (cbMultiByte == 0)

  {

    cbMultiByte = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, nullptr, 0,

                                      nullptr, nullptr);

    allocate = TRUE;

  }

  else if (!(*lpMultiByteStr))

    allocate = TRUE;

  if (cbMultiByte < 1)

    return 0;

  if (allocate)

  {

    *lpMultiByteStr = (LPSTR)calloc(1, (size_t)cbMultiByte + 1ull);

    if (!(*lpMultiByteStr))

    {

      // SetLastError(ERROR_INSUFFICIENT_BUFFER);

      return 0;

    }

  }

  status = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, *lpMultiByteStr,

                               cbMultiByte, lpDefaultChar, lpUsedDefaultChar);

  if ((status != cbMultiByte) && allocate)

  {

    status = 0;

  }

  if ((status <= 0) && allocate)

  {

    free(*lpMultiByteStr);

    *lpMultiByteStr = nullptr;

  }

  return status;

}

#endif

/**

 * Swap Unicode byte order (UTF16LE <-> UTF16BE)

 */

const WCHAR* ByteSwapUnicode(WCHAR* wstr, size_t length)

{

  WINPR_ASSERT(wstr || (length == 0));

  for (size_t x = 0; x < length; x++)

    wstr[x] = _byteswap_ushort(wstr[x]);

  return wstr;

}

SSIZE_T ConvertWCharToUtf8(const WCHAR* wstr, char* str, size_t len)

{

  if (!wstr)

  {

    if (str && len)

      str[0] = 0;

    return 0;

  }

  const size_t wlen = _wcslen(wstr);

  return ConvertWCharNToUtf8(wstr, wlen + 1, str, len);

}

SSIZE_T ConvertWCharNToUtf8(const WCHAR* wstr, size_t wlen, char* str, size_t len)

{

  BOOL isNullTerminated = FALSE;

  if (wlen == 0)

    return 0;

  WINPR_ASSERT(wstr);

  size_t iwlen = _wcsnlen(wstr, wlen);

  if ((len > INT32_MAX) || (wlen > INT32_MAX))

  {

    SetLastError(ERROR_INVALID_PARAMETER);

    return -1;

  }

  if (iwlen < wlen)

  {

    isNullTerminated = TRUE;

    iwlen++;

  }

  const int rc =

      WideCharToMultiByte(CP_UTF8, 0, wstr, (int)iwlen, str, (int)len, nullptr, nullptr);

  if ((rc <= 0) || ((len > 0) && ((size_t)rc > len)))

    return -1;

  else if (!isNullTerminated)

  {

    if (str && ((size_t)rc < len))

      str[rc] = '\0';

    return rc;

  }

  else if ((size_t)rc == len)

  {

    if (str && (str[rc - 1] != '\0'))

      return rc;

  }

  return rc - 1;

}

SSIZE_T ConvertMszWCharNToUtf8(const WCHAR* wstr, size_t wlen, char* str, size_t len)

{

  if (wlen == 0)

    return 0;

  WINPR_ASSERT(wstr);

  if ((len > INT32_MAX) || (wlen > INT32_MAX))

  {

    SetLastError(ERROR_INVALID_PARAMETER);

    return -1;

  }

  const int iwlen = (int)len;

  const int rc = WideCharToMultiByte(CP_UTF8, 0, wstr, (int)wlen, str, iwlen, nullptr, nullptr);

  if ((rc <= 0) || ((len > 0) && (rc > iwlen)))

    return -1;

  return rc;

}

SSIZE_T ConvertUtf8ToWChar(const char* str, WCHAR* wstr, size_t wlen)

{

  if (!str)

  {

    if (wstr && wlen)

      wstr[0] = 0;

    return 0;

  }

  const size_t len = strlen(str);

  return ConvertUtf8NToWChar(str, len + 1, wstr, wlen);

}

SSIZE_T ConvertUtf8NToWChar(const char* str, size_t len, WCHAR* wstr, size_t wlen)

{

  size_t ilen = strnlen(str, len);

  BOOL isNullTerminated = FALSE;

  if (len == 0)

    return 0;

  WINPR_ASSERT(str);

  if ((len > INT32_MAX) || (wlen > INT32_MAX))

  {

    SetLastError(ERROR_INVALID_PARAMETER);

    return -1;

  }

  if (ilen < len)

  {

    isNullTerminated = TRUE;

    ilen++;

  }

  const int iwlen = (int)wlen;

  const int rc = MultiByteToWideChar(CP_UTF8, 0, str, (int)ilen, wstr, iwlen);

  if ((rc <= 0) || ((wlen > 0) && (rc > iwlen)))

    return -1;

  if (!isNullTerminated)

  {

    if (wstr && (rc < iwlen))

      wstr[rc] = '\0';

    return rc;

  }

  else if (rc == iwlen)

  {

    if (wstr && (wstr[rc - 1] != '\0'))

      return rc;

  }

  return rc - 1;

}

SSIZE_T ConvertMszUtf8NToWChar(const char* str, size_t len, WCHAR* wstr, size_t wlen)

{

  if (len == 0)

    return 0;

  WINPR_ASSERT(str);

  if ((len > INT32_MAX) || (wlen > INT32_MAX))

  {

    SetLastError(ERROR_INVALID_PARAMETER);

    return -1;

  }

  const int iwlen = (int)wlen;

  const int rc = MultiByteToWideChar(CP_UTF8, 0, str, (int)len, wstr, iwlen);

  if ((rc <= 0) || ((wlen > 0) && (rc > iwlen)))

    return -1;

  return rc;

}

char* ConvertWCharToUtf8Alloc(const WCHAR* wstr, size_t* pUtfCharLength)

{

  char* tmp = nullptr;

  const SSIZE_T rc = ConvertWCharToUtf8(wstr, nullptr, 0);

  if (pUtfCharLength)

    *pUtfCharLength = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(char));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertWCharToUtf8(wstr, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pUtfCharLength)

    *pUtfCharLength = (size_t)rc2;

  return tmp;

}

char* ConvertWCharNToUtf8Alloc(const WCHAR* wstr, size_t wlen, size_t* pUtfCharLength)

{

  char* tmp = nullptr;

  const SSIZE_T rc = ConvertWCharNToUtf8(wstr, wlen, nullptr, 0);

  if (pUtfCharLength)

    *pUtfCharLength = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(char));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertWCharNToUtf8(wstr, wlen, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pUtfCharLength)

    *pUtfCharLength = (size_t)rc2;

  return tmp;

}

char* ConvertMszWCharNToUtf8Alloc(const WCHAR* wstr, size_t wlen, size_t* pUtfCharLength)

{

  char* tmp = nullptr;

  const SSIZE_T rc = ConvertMszWCharNToUtf8(wstr, wlen, nullptr, 0);

  if (pUtfCharLength)

    *pUtfCharLength = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(char));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertMszWCharNToUtf8(wstr, wlen, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pUtfCharLength)

    *pUtfCharLength = (size_t)rc2;

  return tmp;

}

WCHAR* ConvertUtf8ToWCharAlloc(const char* str, size_t* pSize)

{

  WCHAR* tmp = nullptr;

  const SSIZE_T rc = ConvertUtf8ToWChar(str, nullptr, 0);

  if (pSize)

    *pSize = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(WCHAR));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertUtf8ToWChar(str, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pSize)

    *pSize = (size_t)rc2;

  return tmp;

}

WCHAR* ConvertUtf8NToWCharAlloc(const char* str, size_t len, size_t* pSize)

{

  WCHAR* tmp = nullptr;

  const SSIZE_T rc = ConvertUtf8NToWChar(str, len, nullptr, 0);

  if (pSize)

    *pSize = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(WCHAR));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertUtf8NToWChar(str, len, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pSize)

    *pSize = (size_t)rc2;

  return tmp;

}

WCHAR* ConvertMszUtf8NToWCharAlloc(const char* str, size_t len, size_t* pSize)

{

  WCHAR* tmp = nullptr;

  const SSIZE_T rc = ConvertMszUtf8NToWChar(str, len, nullptr, 0);

  if (pSize)

    *pSize = 0;

  if (rc < 0)

    return nullptr;

  tmp = calloc((size_t)rc + 1ull, sizeof(WCHAR));

  if (!tmp)

    return nullptr;

  const SSIZE_T rc2 = ConvertMszUtf8NToWChar(str, len, tmp, (size_t)rc + 1ull);

  if (rc2 < 0)

  {

    free(tmp);

    return nullptr;

  }

  WINPR_ASSERT(rc == rc2);

  if (pSize)

    *pSize = (size_t)rc2;

  return tmp;

}