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Comment:Revise and enhance the Win32 string conversion routines.
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SHA1:345860c92195544aad44ea9b0d14c9ebbd50adf2
User & Date: mistachkin 2016-04-03 22:44:16
Context
2016-04-04
02:05
More refactoring and cleanup work on the Win32 string conversion and utility routines. check-in: 02ccb444 user: mistachkin tags: altShellFix
2016-04-03
22:44
Revise and enhance the Win32 string conversion routines. check-in: 345860c9 user: mistachkin tags: altShellFix
20:50
Replace the new fprintf() calls. check-in: f76c3a0c user: mistachkin tags: altShellFix
Changes
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Changes to src/os_win.c.

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#endif /* SQLITE_WIN32_MALLOC */

/*
** Convert a UTF-8 string to Microsoft Unicode (UTF-16?).
**
** Space to hold the returned string is obtained from malloc.
*/
static LPWSTR winUtf8ToUnicode(const char *zFilename){
  int nChar;
  LPWSTR zWideFilename;

  nChar = osMultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
  if( nChar==0 ){
    return 0;
  }
  zWideFilename = sqlite3MallocZero( nChar*sizeof(zWideFilename[0]) );
  if( zWideFilename==0 ){
    return 0;
  }
  nChar = osMultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename,
                                nChar);
  if( nChar==0 ){
    sqlite3_free(zWideFilename);
    zWideFilename = 0;
  }
  return zWideFilename;
}

/*
** Convert Microsoft Unicode to UTF-8.  Space to hold the returned string is
** obtained from sqlite3_malloc().
*/
static char *winUnicodeToUtf8(LPCWSTR zWideFilename){
  int nByte;
  char *zFilename;

  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, 0, 0, 0, 0);
  if( nByte == 0 ){
    return 0;
  }
  zFilename = sqlite3MallocZero( nByte );
  if( zFilename==0 ){
    return 0;
  }
  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, zFilename, nByte,
                                0, 0);
  if( nByte == 0 ){
    sqlite3_free(zFilename);
    zFilename = 0;
  }
  return zFilename;
}

/*
** Convert an ANSI string to Microsoft Unicode, based on the
** current codepage settings for file apis.
**
** Space to hold the returned string is obtained
** from sqlite3_malloc.
*/
static LPWSTR winMbcsToUnicode(const char *zFilename){
  int nByte;
  LPWSTR zMbcsFilename;
  int codepage = osAreFileApisANSI() ? CP_ACP : CP_OEMCP;

  nByte = osMultiByteToWideChar(codepage, 0, zFilename, -1, NULL,
                                0)*sizeof(WCHAR);
  if( nByte==0 ){
    return 0;
  }
  zMbcsFilename = sqlite3MallocZero( nByte*sizeof(zMbcsFilename[0]) );
  if( zMbcsFilename==0 ){
    return 0;
  }
  nByte = osMultiByteToWideChar(codepage, 0, zFilename, -1, zMbcsFilename,
                                nByte);
  if( nByte==0 ){
    sqlite3_free(zMbcsFilename);
    zMbcsFilename = 0;
  }
  return zMbcsFilename;
}
................................................................................
/*
** Convert Microsoft Unicode to multi-byte character string, based on the
** user's ANSI codepage.
**
** Space to hold the returned string is obtained from
** sqlite3_malloc().
*/
static char *winUnicodeToMbcs(LPCWSTR zWideFilename){
  int nByte;
  char *zFilename;
  int codepage = osAreFileApisANSI() ? CP_ACP : CP_OEMCP;

  nByte = osWideCharToMultiByte(codepage, 0, zWideFilename, -1, 0, 0, 0, 0);
  if( nByte == 0 ){
    return 0;
  }
  zFilename = sqlite3MallocZero( nByte );
  if( zFilename==0 ){
    return 0;
  }
  nByte = osWideCharToMultiByte(codepage, 0, zWideFilename, -1, zFilename,
                                nByte, 0, 0);
  if( nByte == 0 ){
    sqlite3_free(zFilename);
    zFilename = 0;
  }
  return zFilename;
}

/*
** Convert multibyte character string to UTF-8.  Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_mbcs_to_utf8(const char *zFilename){
  char *zFilenameUtf8;
  LPWSTR zTmpWide;


















  zTmpWide = winMbcsToUnicode(zFilename);

















  if( zTmpWide==0 ){
    return 0;
  }
  zFilenameUtf8 = winUnicodeToUtf8(zTmpWide);
  sqlite3_free(zTmpWide);
  return zFilenameUtf8;
}

/*
** Convert UTF-8 to multibyte character string.  Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_utf8_to_mbcs(const char *zFilename){
  char *zFilenameMbcs;
  LPWSTR zTmpWide;

  zTmpWide = winUtf8ToUnicode(zFilename);


































  if( zTmpWide==0 ){
    return 0;
  }
  zFilenameMbcs = winUnicodeToMbcs(zTmpWide);
  sqlite3_free(zTmpWide);
  return zFilenameMbcs;
}

/*
** This function sets the data directory or the temporary directory based on
** the provided arguments.  The type argument must be 1 in order to set the
** data directory or 2 in order to set the temporary directory.  The zValue
** argument is the name of the directory to use.  The return value will be







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#endif /* SQLITE_WIN32_MALLOC */

/*
** Convert a UTF-8 string to Microsoft Unicode (UTF-16?).
**
** Space to hold the returned string is obtained from malloc.
*/
static LPWSTR winUtf8ToUnicode(const char *zText){
  int nChar;
  LPWSTR zWideText;

  nChar = osMultiByteToWideChar(CP_UTF8, 0, zText, -1, NULL, 0);
  if( nChar==0 ){
    return 0;
  }
  zWideText = sqlite3MallocZero( nChar*sizeof(WCHAR) );
  if( zWideText==0 ){
    return 0;
  }
  nChar = osMultiByteToWideChar(CP_UTF8, 0, zText, -1, zWideText,
                                nChar);
  if( nChar==0 ){
    sqlite3_free(zWideText);
    zWideText = 0;
  }
  return zWideText;
}

/*
** Convert Microsoft Unicode to UTF-8.  Space to hold the returned string is
** obtained from sqlite3_malloc().
*/
static char *winUnicodeToUtf8(LPCWSTR zWideText){
  int nByte;
  char *zText;

  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideText, -1, 0, 0, 0, 0);
  if( nByte == 0 ){
    return 0;
  }
  zText = sqlite3MallocZero( nByte );
  if( zText==0 ){
    return 0;
  }
  nByte = osWideCharToMultiByte(CP_UTF8, 0, zWideText, -1, zText, nByte,
                                0, 0);
  if( nByte == 0 ){
    sqlite3_free(zText);
    zText = 0;
  }
  return zText;
}

/*
** Convert an ANSI string to Microsoft Unicode, based on the
** current codepage settings for file apis.
**
** Space to hold the returned string is obtained
** from sqlite3_malloc.
*/
static LPWSTR winMbcsToUnicode(const char *zText, int useAnsi){
  int nByte;
  LPWSTR zMbcsFilename;
  int codepage = useAnsi ? CP_ACP : CP_OEMCP;

  nByte = osMultiByteToWideChar(codepage, 0, zText, -1, NULL,
                                0)*sizeof(WCHAR);
  if( nByte==0 ){
    return 0;
  }
  zMbcsFilename = sqlite3MallocZero( nByte*sizeof(zMbcsFilename[0]) );
  if( zMbcsFilename==0 ){
    return 0;
  }
  nByte = osMultiByteToWideChar(codepage, 0, zText, -1, zMbcsFilename,
                                nByte);
  if( nByte==0 ){
    sqlite3_free(zMbcsFilename);
    zMbcsFilename = 0;
  }
  return zMbcsFilename;
}
................................................................................
/*
** Convert Microsoft Unicode to multi-byte character string, based on the
** user's ANSI codepage.
**
** Space to hold the returned string is obtained from
** sqlite3_malloc().
*/
static char *winUnicodeToMbcs(LPCWSTR zWideText, int useAnsi){
  int nByte;
  char *zText;
  int codepage = useAnsi ? CP_ACP : CP_OEMCP;

  nByte = osWideCharToMultiByte(codepage, 0, zWideText, -1, 0, 0, 0, 0);
  if( nByte == 0 ){
    return 0;
  }
  zText = sqlite3MallocZero( nByte );
  if( zText==0 ){
    return 0;
  }
  nByte = osWideCharToMultiByte(codepage, 0, zWideText, -1, zText,
                                nByte, 0, 0);
  if( nByte == 0 ){
    sqlite3_free(zText);
    zText = 0;
  }
  return zText;
}

/*
** Convert multibyte character string to UTF-8.  Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_mbcs_to_utf8(const char *zText){
  char *zTextUtf8;
  LPWSTR zTmpWide;

  zTmpWide = winMbcsToUnicode(zText, osAreFileApisANSI());
  if( zTmpWide==0 ){
    return 0;
  }
  zTextUtf8 = winUnicodeToUtf8(zTmpWide);
  sqlite3_free(zTmpWide);
  return zTextUtf8;
}

/*
** Convert multibyte character string to UTF-8 using the ANSI codepage.
** Space to hold the returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_mbcs_to_utf8_via_ansi(const char *zText){
  char *zTextUtf8;
  LPWSTR zTmpWide;

  zTmpWide = winMbcsToUnicode(zText, 1);
  if( zTmpWide==0 ){
    return 0;
  }
  zTextUtf8 = winUnicodeToUtf8(zTmpWide);
  sqlite3_free(zTmpWide);
  return zTextUtf8;
}

/*
** Convert multibyte character string to UTF-8 using the OEM codepage.
** Space to hold the returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_mbcs_to_utf8_via_oem(const char *zText){
  char *zTextUtf8;
  LPWSTR zTmpWide;

  zTmpWide = winMbcsToUnicode(zText, 0);
  if( zTmpWide==0 ){
    return 0;
  }
  zTextUtf8 = winUnicodeToUtf8(zTmpWide);
  sqlite3_free(zTmpWide);
  return zTextUtf8;
}

/*
** Convert UTF-8 to multibyte character string.  Space to hold the
** returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_utf8_to_mbcs(const char *zText){
  char *zTextMbcs;
  LPWSTR zTmpWide;

  zTmpWide = winUtf8ToUnicode(zText);
  if( zTmpWide==0 ){
    return 0;
  }
  zTextMbcs = winUnicodeToMbcs(zTmpWide, osAreFileApisANSI());
  sqlite3_free(zTmpWide);
  return zTextMbcs;
}

/*
** Convert UTF-8 to multibyte character string using the ANSI codepage.
** Space to hold the returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_utf8_to_mbcs_via_ansi(const char *zText){
  char *zTextMbcs;
  LPWSTR zTmpWide;

  zTmpWide = winUtf8ToUnicode(zText);
  if( zTmpWide==0 ){
    return 0;
  }
  zTextMbcs = winUnicodeToMbcs(zTmpWide, 1);
  sqlite3_free(zTmpWide);
  return zTextMbcs;
}

/*
** Convert UTF-8 to multibyte character string using the OEM codepage.
** Space to hold the returned string is obtained from sqlite3_malloc().
*/
char *sqlite3_win32_utf8_to_mbcs_via_oem(const char *zText){
  char *zTextMbcs;
  LPWSTR zTmpWide;

  zTmpWide = winUtf8ToUnicode(zText);
  if( zTmpWide==0 ){
    return 0;
  }
  zTextMbcs = winUnicodeToMbcs(zTmpWide, 0);
  sqlite3_free(zTmpWide);
  return zTextMbcs;
}

/*
** This function sets the data directory or the temporary directory based on
** the provided arguments.  The type argument must be 1 in order to set the
** data directory or 2 in order to set the temporary directory.  The zValue
** argument is the name of the directory to use.  The return value will be