unicdman.cpp

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// $Id: unicdman.cpp 788 2006-04-07 10:05:16Z luke $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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=================================XARAHEADEREND============================
 */
// 

#include "camtypes.h"
#include "unicdman.h"

#include "camelot.h"

// We want better memory tracking
// Declare smart memory handling in Debug builds
#define new CAM_DEBUG_NEW


/********************************************************************************************
>   static inline BOOL UnicodeManager::IsDBCSLeadByte(BYTE TestChar)

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/7/96
    Inputs:     TestChar - the character to test
    Outputs:    -
    Returns:    TRUE if the character is a DBCS lead character, FALSE if not
    Purpose:    Platform independent way of testing for lead bytes.
    Note:       It's inline, in the header
********************************************************************************************/

/********************************************************************************************
>   static inline UINT32 UnicodeManager::ComposeMultiBytes(BYTE LeadChar, BYTE TrailChar)

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/7/96
    Inputs:     LeadChar    - Lead multichar byte
                TrailChar   - Trail multichar byte
    Outputs:    -
    Returns:    A composed UINT32 reperesenting the multibyte character
    Purpose:    One standard (correct!) way for composing the lead and trail bytes
    Note:       It's inline, in the header
********************************************************************************************/

/********************************************************************************************
>   static void UnicodeManager::DecomposeMultiBytes(UINT32 MBChar, BYTE* LeadChar, BYTE* TrailChar);

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/7/96
    Inputs:     MBChar  - the composed multibyte character
    Outputs:    LeadChar    - Lead multichar byte
                TrailChar   - Trail multichar byte
    Returns:    -
    Purpose:    One standard (correct!) way for decomposing the lead and trail bytes
********************************************************************************************/
void UnicodeManager::DecomposeMultiBytes(UINT32 MBChar, BYTE* LeadChar, BYTE* TrailChar)
{
    ERROR3IF(LeadChar==NULL || TrailChar==NULL, "Output pointers were NULL");

    if (LeadChar!=NULL || TrailChar!=NULL)
    {
        *LeadChar = (MBChar >> 8) & 0xFF;
        *TrailChar = MBChar & 0xFF;
    }
}



/********************************************************************************************
>   static UINT32 UnicodeManager::UnicodeToMultiByte(WCHAR UnicodeChar)

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/10/95
    Inputs:     UnicodeChar - a single unicode character
    Ouptuts:    -
    Returns:    A single multi-byte character value that represents UnicodeChar
    Purpose:    Converts a single unicode character into it's multi-byte equivelent.
                BUT what about two composed characters? Oh...
    Errors:     If the conversion fails then character 128 (box), or the system defualt is
                returned.
********************************************************************************************/
UINT32 UnicodeManager::UnicodeToMultiByte(WCHAR UnicodeChar)
{
#if defined(__WXMSW__)
    if (UnicodeChar < 128)
        return UnicodeChar;
        
    CHAR Return[20];
    LPSTR lpReturn = Return;
    INT32 sizeReturn = sizeof lpReturn;

    // Get the active code page.
    // This is for Win95/98 systems which do not support unicode.
    UINT32 nCodePage = GetACP();
    ERROR3IF( (!IsValidCodePage(nCodePage)), "UnicodeManager::UnicodeToMultiByte - not a valid codepage" );

    // COnvert from Unicode
    if ( ::WideCharToMultiByte(nCodePage, WC_COMPOSITECHECK | WC_DEFAULTCHAR, &UnicodeChar, 1,
                                lpReturn, sizeReturn, NULL, NULL) )
    {
        if (IsDBCSLeadByte(Return[0]))
            return ((unsigned char)Return[0] << 8) | (unsigned char)Return[1];
        else
            return (unsigned char)Return[0];
    }
    else
    {
        ERROR3("MultiByteToWideChar failed");
        return 128;
    }
#else
    char                psz[MB_CUR_MAX];
    switch( wctomb( psz, UnicodeChar ) )
    {
    case 1:
        return (unsigned char)psz[0];

    case 2:
        return ( (unsigned char)psz[0] << 8 ) | (unsigned char)psz[1];
    
    case 4:
        printf( "UniCh = %08x\n", ( (unsigned char)psz[0] << 24 ) | 
              ( (unsigned char)psz[1] << 16 ) | ( (unsigned char)psz[2] << 8 )  | 
                (unsigned char)psz[3] ); 
        return( (unsigned char)psz[0] << 24 ) | ( (unsigned char)psz[1] << 16 ) | 
              ( (unsigned char)psz[2] << 8 )  |   (unsigned char)psz[3];
    
    default:
        ERROR3("MultiByteToWideChar failed");
        return 128;     
    }
#endif
}


/********************************************************************************************
>   static WCHAR UnicodeManager::MultiByteToUnicode(UINT32 MBChar)

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/10/95
    Inputs:     MBChar - a single multi-byte character
    Ouptuts:    -
    Returns:    The unicode value that represents MBChar
    Purpose:    Converts a single multi-byte character into it's unicode equivelent.
                BUT what about two composed characters? Oh...  Unimplemented as no one will
                cope with two chars being returned...
    Errors:     If the conversion fails then character 128 (box) is returned.
********************************************************************************************/
WCHAR UnicodeManager::MultiByteToUnicode( UINT32 MBChar )
{
    CHAR                MBArray[3];
    WCHAR               ReturnArray[4];
    size_t              cch;

    // Convert UINT32 to DBCS
    if( IsDBCSLeadByte( ( MBChar >> 8 ) & 0xFF ) )
    {
        MBArray[0] = (MBChar>>8) & 0xFF;
        MBArray[1] = MBChar & 0xFF;
        MBArray[2] = 0;
        cch = 2;
    }
    else
    {
        MBArray[0] = MBChar & 0xFF;
        MBArray[1] = 0;
        cch = 1;
    }
    
#if defined(__WXMSW__)
    // Get the active code page.
    // This is for Win95/98 systems which do not support unicode.
    UINT32 nCodePage = GetACP();
    ERROR3IF( (!IsValidCodePage(nCodePage)), "UnicodeManager::MultiByteToUnicode - not a valid codepage" );

    // Convert to Unicode
    if ( ::MultiByteToWideChar(nCodePage, MB_PRECOMPOSED, MBArray, -1, ReturnArray, 4) )
    {
        return ReturnArray[0];  // Composed chars then?
    }
    else
    {
        ERROR3("MultiByteToWideChar failed");
        /*DWORD dwError = GetLastError();
        //ERROR3_PF ("Error=%lx", dwError);
        char sError[20];
        sprintf (sError, "Error=%lx", dwError);
        ERROR3 (sError);*/
        return 128;
    }
#else
    mbstate_t           state;
    memset(&state, 0, sizeof(mbstate_t));
    mbrtowc( ReturnArray, MBArray, cch, &state );
    return ReturnArray[0];
#endif
}



/********************************************************************************************
>   BOOL UnicodeManager::IsUnicodeCompleteOS()

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/10/95
    Returns:    TRUE if running on a Unicode Complete OS
********************************************************************************************/
BOOL UnicodeManager::IsUnicodeCompleteOS()
{
#if defined(__WXMSW__)
    return IsWin32NT();
#elif defined(__WXGTK__)
    return true;
#endif
}



/********************************************************************************************
>   BOOL UnicodeManager::IsDBCSOS()

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/6/99
    Returns:    TRUE if running on a DBCS enabled OS
********************************************************************************************/
BOOL UnicodeManager::IsDBCSOS()
{
#if defined(__WXMSW__)
    return ::GetSystemMetrics(SM_DBCSENABLED);
#elif defined(__WXGTK__)
    return true;
#endif
}



/********************************************************************************************
>   static UINT32 UnicodeManager::GetFontCharSet()

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31/7/96
    Inputs:     -
    Ouptuts:    -
    Returns:    UINT32 representing the font character set of the system
    Purpose:    Reads what value the system is using for the character sets of its fonts.
********************************************************************************************/
UINT32 UnicodeManager::GetFontCharSet()
{
    if( IsDBCSOS() )
        return SHIFTJIS_CHARSET;
    else
        return ANSI_CHARSET;

//  UINT32 CharSet = 0;
//  
//  // This appears to be the only way of doing this.  It's ugly as we have to create a DC.
//  if (!IsWindows31())
//  {
//      CWnd* pWnd = CWnd::GetDesktopWindow();
//      if (pWnd!=NULL && pWnd->GetDC()!=NULL)
//          CharSet = ::GetTextCharset(pWnd->GetDC()->GetSafeHdc());
//  }
//
//  return CharSet;
}

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