///////////////////////////////////////////////////////////////////////////////
// Name:        strconv.h
// Purpose:     conversion routines for char sets any Unicode
// Author:      Robert Roebling, Ove Kaaven
// Modified by:
// Created:     29/01/98
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Ove Kaaven, Robert Roebling, Vadim Zeitlin
// Licence:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

#ifndef _WX_WXSTRCONVH__
#define _WX_WXSTRCONVH__

#ifdef __GNUG__
  #pragma interface "strconv.h"
#endif

#include "wx/defs.h"
#include "wx/wxchar.h"
#include "wx/buffer.h"

#if defined(__VISAGECPP__) && __IBMCPP__ >= 400
#  undef __BSEXCPT__
#endif

#include <stdlib.h>

#if wxUSE_WCHAR_T

// ----------------------------------------------------------------------------
// wxMBConv (base class for conversions, using libc conversion itself)
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMBConv
{
public:
    // the actual conversion takes place here
    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
    virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;

    // No longer inline since BC++ complains.
    const wxWCharBuffer cMB2WC(const char *psz) const;
    const wxCharBuffer cWC2MB(const wchar_t *psz) const;

#if wxUSE_UNICODE
    const wxWCharBuffer cMB2WX(const char *psz) const { return cMB2WC(psz); }
    const wxCharBuffer cWX2MB(const wchar_t *psz) const { return cWC2MB(psz); }
    const wchar_t* cWC2WX(const wchar_t *psz) const { return psz; }
    const wchar_t* cWX2WC(const wchar_t *psz) const { return psz; }
#else // ANSI
    const char* cMB2WX(const char *psz) const { return psz; }
    const char* cWX2MB(const char *psz) const { return psz; }
    const wxCharBuffer cWC2WX(const wchar_t *psz) const { return cWC2MB(psz); }
    const wxWCharBuffer cWX2WC(const char *psz) const { return cMB2WC(psz); }
#endif // Unicode/ANSI
};

WXDLLEXPORT_DATA(extern wxMBConv) wxConvLibc;

// ----------------------------------------------------------------------------
// wxMBConvUTF7 (for conversion using UTF7 encoding)
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMBConvUTF7 : public wxMBConv
{
public:
    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
    virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
};

WXDLLEXPORT_DATA(extern wxMBConvUTF7) wxConvUTF7;

// ----------------------------------------------------------------------------
// wxMBConvUTF8 (for conversion using UTF8 encoding)
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMBConvUTF8 : public wxMBConv
{
public:
    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
    virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
};

WXDLLEXPORT_DATA(extern wxMBConvUTF8) wxConvUTF8;

#ifdef __WXGTK12__

// ----------------------------------------------------------------------------
// wxMBConvUTF8 (for conversion using GDK's internal converions)
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMBConvGdk : public wxMBConv
{
public:
    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
    virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
};

WXDLLEXPORT_DATA(extern wxMBConvGdk) wxConvGdk;

#endif // wxGTK 1.2

// ----------------------------------------------------------------------------
// wxCSConv (for conversion based on loadable char sets)
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxCharacterSet;

class WXDLLEXPORT wxCSConv : public wxMBConv
{
public:
    wxCSConv(const wxChar *charset);
    wxCSConv(const wxCSConv& conv);
    virtual ~wxCSConv();

    wxCSConv& operator=(const wxCSConv& conv);
    
    void LoadNow();

    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
    virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;

    void Clear() ;

private:
    void SetName(const wxChar *charset);

    // note that we can't use wxString here because of compilation
    // dependencies: we're included from wx/string.h
    wxChar *m_name;
    wxCharacterSet *m_cset;
    bool m_deferred;
};

#define wxConvFile wxConvLocal
WXDLLEXPORT_DATA(extern wxCSConv) wxConvLocal;
WXDLLEXPORT_DATA(extern wxMBConv *) wxConvCurrent;

// ----------------------------------------------------------------------------
// filename conversion macros
// ----------------------------------------------------------------------------

// filenames are multibyte on Unix and probably widechar on Windows?
#if defined(__UNIX__) || defined(__BORLANDC__)
    #define wxMBFILES 1
#else
    #define wxMBFILES 0
#endif

#if wxMBFILES && wxUSE_UNICODE
    #define wxFNCONV(name) wxConvFile.cWX2MB(name)
    #define wxFNSTRINGCAST wxMBSTRINGCAST
#else
    #define wxFNCONV(name) name
    #define wxFNSTRINGCAST WXSTRINGCAST
#endif

#else
  // !wxUSE_WCHAR_T

// ----------------------------------------------------------------------------
// stand-ins in absence of wchar_t
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxMBConv
{
public:
    const char* cMB2WX(const char *psz) const { return psz; }
    const char* cWX2MB(const char *psz) const { return psz; }
};

WXDLLEXPORT_DATA(extern wxMBConv) wxConvLibc, wxConvFile;
WXDLLEXPORT_DATA(extern wxMBConv *) wxConvCurrent;

#define wxFNCONV(name) name
#define wxFNSTRINGCAST WXSTRINGCAST

#endif
  // wxUSE_WCHAR_T

// ----------------------------------------------------------------------------
// macros for the most common conversions
// ----------------------------------------------------------------------------

#if wxUSE_UNICODE
    #define wxConvertWX2MB(s)   wxConvCurrent->cWX2MB(s)
    #define wxConvertMB2WX(s)   wxConvCurrent->cMB2WX(s)
#else // ANSI
    // no conversions to do
    #define wxConvertWX2MB(s)   (s)
    #define wxConvertMB2WX(s)   (s)
#endif // Unicode/ANSI

#endif
  // _WX_WXSTRCONVH__