reactos/lib/kernel32/misc/mbchars.c

   1 /* $Id: mbchars.c,v 1.5 2004/04/04 17:59:23 gvg Exp $
   2  *
   3  */
   4 #include <windows.h>
   5
   6
   7 /**********************************************************************
   8  * NAME                         PRIVATE
   9  *  IsInstalledCP@4
  10  *
  11  * RETURN VALUE
  12  *  TRUE if CodePage is installed in the system.
  13  */
  14 static
  15 BOOL
  16 STDCALL
  17 IsInstalledCP(UINT CodePage)
  18 {
  19     /* FIXME */
  20     return TRUE;
  21 }
  22
  23
  24 /**********************************************************************
  25  * NAME                         EXPORTED
  26  *  MultiByteToWideChar@24
  27  *
  28  * ARGUMENTS
  29  *  CodePage
  30  *      CP_ACP      ANSI code page
  31  *      CP_MACCP    Macintosh code page
  32  *      CP_OEMCP    OEM code page
  33  *      (UINT)      Any installed code page
  34  *
  35  *  dwFlags
  36  *      MB_PRECOMPOSED
  37  *      MB_COMPOSITE
  38  *      MB_ERR_INVALID_CHARS
  39  *      MB_USEGLYPHCHARS
  40  *
  41  *  lpMultiByteStr
  42  *      Input buffer;
  43  *
  44  *  cchMultiByte
  45  *      Size of MultiByteStr, or -1 if MultiByteStr is
  46  *      NULL terminated;
  47  *
  48  *  lpWideCharStr
  49  *      Output buffer;
  50  *
  51  *  cchWideChar
  52  *      Size (in WCHAR unit) of WideCharStr, or 0
  53  *      if the caller just wants to know how large
  54  *      WideCharStr should be for a successful
  55  *      conversion.
  56  *
  57  * RETURN VALUE
  58  *  0 on error; otherwise the number of WCHAR written
  59  *  in the WideCharStr buffer.
  60  *
  61  * NOTE
  62  *  A raw converter for now. It assumes lpMultiByteStr is
  63  *  NEVER multi-byte (that is each input character is
  64  *  8-bit ASCII) and is ALWAYS NULL terminated.
  65  *  FIXME-FIXME-FIXME-FIXME
  66  *
  67  * @implemented
  68  */
  69 INT
  70 STDCALL
  71 MultiByteToWideChar(
  72     UINT    CodePage,
  73     DWORD   dwFlags,
  74     LPCSTR  lpMultiByteStr,
  75     int     cchMultiByte,
  76     LPWSTR  lpWideCharStr,
  77     int     cchWideChar)
  78 {
  79     int InStringLength = 0;
  80     PCHAR   r;
  81     PWCHAR  w;
  82     int cchConverted;
  83
  84     /*
  85      * Check the parameters.
  86      */
  87     if (/* --- CODE PAGE --- */
  88         (  (CP_ACP != CodePage)
  89                 && (CP_MACCP != CodePage)
  90                 && (CP_OEMCP != CodePage)
  91                 && (FALSE == IsInstalledCP(CodePage)) )
  92         /* --- FLAGS --- */
  93         || (dwFlags & ~(MB_PRECOMPOSED | MB_COMPOSITE |
  94                         MB_ERR_INVALID_CHARS | MB_USEGLYPHCHARS))
  95         /* --- INPUT BUFFER --- */
  96         || (NULL == lpMultiByteStr)  )
  97     {
  98         SetLastError (ERROR_INVALID_PARAMETER);
  99         return 0;
 100     }
 101     /*
 102      * Compute the input buffer length.
 103      */
 104     //if (-1 == cchMultiByte)
 105     if (cchMultiByte < 0)
 106     {
 107         InStringLength = lstrlenA(lpMultiByteStr) + 1;
 108     }
 109     else
 110     {
 111         InStringLength = cchMultiByte;
 112     }
 113     /*
 114      * Does caller query for output
 115      * buffer size?
 116      */
 117     if (0 == cchWideChar)
 118     {
 119         //SetLastError(ERROR_SUCCESS); /* according to wine tests this shouldn't be touched on success.
 120         return InStringLength;
 121     }
 122     /*
 123      * Is space provided for the translated
 124      * string enough?
 125      */
 126     if (cchWideChar < InStringLength)
 127     {
 128         SetLastError(ERROR_INSUFFICIENT_BUFFER);
 129         return 0;
 130     }
 131     /*
 132      * Raw 8- to 16-bit conversion.
 133      */
 134     for (cchConverted = 0,
 135         r = (PCHAR)lpMultiByteStr,
 136         w = (PWCHAR)lpWideCharStr;
 137
 138         cchConverted < InStringLength;
 139
 140         r++,
 141         w++,
 142         cchConverted++)
 143     {
 144         *w = (WCHAR)(unsigned char) *r;
 145     }
 146     /*
 147      * Return how many characters we
 148      * wrote in the output buffer.
 149      */
 150     //SetLastError(ERROR_SUCCESS); /* according to wine tests this shouldn't be touched on success.
 151     return cchConverted;
 152 }
 153
 154
 155 /**********************************************************************
 156  * NAME                         EXPORTED
 157  *  WideCharToMultiByte@32
 158  *
 159  *  Not yet implemented complete (without NLS so far)
 160  *
 161  * ARGUMENTS
 162  *  CodePage
 163  *      CP_ACP ANSI code page
 164  *      CP_MACCP Macintosh code page
 165  *      CP_OEMCP OEM code page
 166  *      CP_SYMBOL Symbol code page (42)
 167  *      CP_THREAD_ACP Current thread's ANSI code page
 168  *      CP_UTF7 Translate using UTF-7
 169  *      CP_UTF8 Translate using UTF-8
 170  *      (UINT)      Any installed code page
 171  *
 172  *  dwFlags
 173  *      WC_NO_BEST_FIT_CHARS
 174  *      WC_COMPOSITECHECK Convert composite characters to precomposed characters.
 175  *      WC_DISCARDNS Discard nonspacing characters during conversion.
 176  *      WC_SEPCHARS Generate separate characters during conversion. This is the default conversion behavior.
 177  *      WC_DEFAULTCHAR Replace exceptions with the default character during conversion.
 178  *
 179  *  lpWideCharStr
 180  *      Points to the wide-character string to be converted.
 181  *
 182  *  cchWideChar
 183  *      Size (in WCHAR unit) of WideCharStr, or 0
 184  *      if the caller just wants to know how large
 185  *      WideCharStr should be for a successful
 186  *      conversion.
 187  *  lpMultiByteStr
 188  *      Points to the buffer to receive the translated string.
 189  *  cchMultiByte
 190  *      Specifies the size in bytes of the buffer pointed to by the
 191  *      lpMultiByteStr parameter. If this value is zero, the function
 192  *      returns the number of bytes required for the buffer.
 193  *  lpDefaultChar
 194  *      Points to the character used if a wide character cannot be
 195  *      represented in the specified code page. If this parameter is
 196  *      NULL, a system default value is used.
 197         FIXME: ignored
 198  *  lpUsedDefaultChar
 199  *      Points to a flag that indicates whether a default character was used.
 200  *      This parameter may be NULL.
 201         FIXME: allways set to FALSE.
 202  *
 203  *
 204  *
 205  * RETURN VALUE
 206  *  0 on error; otherwise the number of bytes written
 207  *  in the lpMultiByteStr buffer. Or the number of
 208  *  bytes needed for the lpMultiByteStr buffer if cchMultiByte is zero.
 209  *
 210  * NOTE
 211  *  A raw converter for now. It just cuts off the upper 9 Bit.
 212  *  So the MBCS-string does not contain any LeadCharacters
 213  *  FIXME - FIXME - FIXME - FIXME
 214  *
 215  * @implemented
 216  */
 217 int
 218 STDCALL
 219 WideCharToMultiByte(
 220     UINT    CodePage,
 221     DWORD   dwFlags,
 222     LPCWSTR lpWideCharStr,
 223     int     cchWideChar,
 224     LPSTR   lpMultiByteStr,
 225     int     cchMultiByte,
 226     LPCSTR  lpDefaultChar,
 227     LPBOOL  lpUsedDefaultChar
 228     )
 229 {
 230     int wi, di;  // wide counter, dbcs byte count
 231
 232     /*
 233      * Check the parameters.
 234      */
 235     if (    /* --- CODE PAGE --- */
 236         (   (CP_ACP != CodePage)
 237             && (CP_MACCP != CodePage)
 238             && (CP_OEMCP != CodePage)
 239             && (CP_SYMBOL != CodePage)
 240             && (CP_THREAD_ACP != CodePage)
 241             && (CP_UTF7 != CodePage)
 242             && (CP_UTF8 != CodePage)
 243             && (FALSE == IsInstalledCP (CodePage))
 244             )
 245         /* --- FLAGS --- */
 246         || (dwFlags & ~(/*WC_NO_BEST_FIT_CHARS
 247                 |*/ WC_COMPOSITECHECK
 248                 | WC_DISCARDNS
 249                 | WC_SEPCHARS
 250                 | WC_DEFAULTCHAR
 251                 )
 252             )
 253         /* --- INPUT BUFFER --- */
 254         || (NULL == lpWideCharStr)
 255         )
 256     {
 257         SetLastError(ERROR_INVALID_PARAMETER);
 258         return 0;
 259     }
 260
 261     // for now, make no difference but only convert cut the characters to 7Bit
 262     //if (cchWideChar == -1) // assume its a 0-terminated str
 263     if (cchWideChar < 0) // assume its a 0-terminated str
 264     {           // and determine its length
 265 //        for (cchWideChar=0; lpWideCharStr[cchWideChar]!=0; cchWideChar++)
 266 //            cchWideChar++;
 267         for (cchWideChar = 0; lpWideCharStr[cchWideChar] != 0; cchWideChar++) {
 268         }
 269         cchWideChar++; // length includes the null terminator
 270     }
 271
 272     // user wants to determine needed space
 273     if (cchMultiByte == 0)
 274     {
 275         //SetLastError(ERROR_SUCCESS); /* according to wine tests this shouldn't be touched on success.
 276         return cchWideChar;         // FIXME: determine correct.
 277     }
 278     // the lpWideCharStr is cchWideChar characters long.
 279     for (wi=0, di=0; wi<cchWideChar && di<cchMultiByte; ++wi, ++di)
 280     {
 281         // Flag and a not displayable char    FIXME
 282         /*if( (dwFlags&WC_NO_BEST_FIT_CHARS) && (lpWideCharStr[wi] >127) )
 283         {
 284             lpMultiByteStr[di]=
 285             *lpUsedDefaultChar = TRUE;
 286
 287         }*/
 288         // FIXME
 289         // just cut off the upper 9 Bit, since vals>=128 mean LeadByte.
 290         lpMultiByteStr[di] = lpWideCharStr[wi] & 0x007F;
 291     }
 292     // has MultiByte exceeded but Wide is still in the string?
 293     if (wi < cchWideChar && di >= cchMultiByte)
 294     {
 295         SetLastError(ERROR_INSUFFICIENT_BUFFER);
 296         return 0;
 297     }
 298     // else return # of bytes wirtten to MBCSbuffer (di)
 299     //SetLastError(ERROR_SUCCESS); /* according to wine tests this shouldn't be touched on success.
 300     // FIXME: move that elsewhere
 301     if (lpUsedDefaultChar != NULL) *lpUsedDefaultChar = FALSE;
 302     return di;
 303 }
 304
 305 /* EOF */