BOOL IsUTF8URL()

in lib/normalize.cxx [219:287]

• 52 lines of code
• 13 McCabe index (conditional complexity)

BOOL IsUTF8URL(__in LPSTR pszPath)
{
    CHAR    ch;

    if ( g_fFavorDBCS )
    {
        return ( MultiByteToWideChar( CP_ACP,
                                      MB_ERR_INVALID_CHARS,
                                      pszPath,
                                      -1,
                                      NULL,
                                      0) == 0);
    }

    while (ch = *pszPath++) {

        if (ch & 0x80) {
            wchar_t wch;
            int     iLen;
            BOOL    bDefault = FALSE;
            char    chTrail1;
            char    chTrail2;

            chTrail1 = *pszPath++;
            if (chTrail1) {
                chTrail2 = *pszPath;
            } else {
                chTrail2 = 0;
            }

            if ( ((ch & 0xF0) == 0xE0) &&
              IS_UTF8_TRAILBYTE(chTrail1) &&
              IS_UTF8_TRAILBYTE(chTrail2) ) {

                // handle three byte case
                // 1110xxxx 10xxxxxx 10xxxxxx
                wch = (wchar_t) (((ch & 0x0f) << 12) |
                                ((chTrail1 & 0x3f) << 6) |
                                (chTrail2 & 0x3f));
                pszPath++;

            } else
            if ( ((ch & 0xE0) == 0xC0) &&
              IS_UTF8_TRAILBYTE(chTrail1) ) {

                // handle two byte case
                // 110xxxxx 10xxxxxx

                wch = (wchar_t) (((ch & 0x1f) << 6) | (chTrail1 & 0x3f));

            } else
                return FALSE;

            iLen = WideCharToMultiByte( CP_ACP,
                                        WC_NO_BEST_FIT_CHARS,
                                        &wch,
                                        1,
                                        NULL,
                                        0,
                                        NULL,
                                        &bDefault );

            if (bDefault == TRUE || iLen == 0 || iLen > 2)
                return FALSE;
        }
    }

    return TRUE;
}   // IsUTF8URL()