/*
 *  unicode.h
 *
 *  $Id$
 *
 *  ODBC unicode support
 *
 *  The iODBC driver manager.
 *
 *  Copyright (C) 1996-2021 OpenLink Software <iodbc@openlinksw.com>
 *  All Rights Reserved.
 *
 *  This software is released under the terms of either of the following
 *  licenses:
 *
 *      - GNU Library General Public License (see LICENSE.LGPL)
 *      - The BSD License (see LICENSE.BSD).
 *
 *  Note that the only valid version of the LGPL license as far as this
 *  project is concerned is the original GNU Library General Public License
 *  Version 2, dated June 1991.
 *
 *  While not mandated by the BSD license, any patches you make to the
 *  iODBC source code may be contributed back into the iODBC project
 *  at your discretion. Contributions will benefit the Open Source and
 *  Data Access community as a whole. Submissions may be made at:
 *
 *      http://www.iodbc.org
 *
 *
 *  GNU Library Generic Public License Version 2
 *  ============================================
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; only
 *  Version 2 of the License dated June 1991.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *  The BSD License
 *  ===============
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *  3. Neither the name of OpenLink Software Inc. nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OPENLINK OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _UNICODE_H
#define _UNICODE_H

#include <iodbc.h>
#include <iodbcext.h>

#if defined (HAVE_WCHAR_H)
#include <wchar.h>
#endif

typedef unsigned char  utf8_t;
typedef unsigned short ucs2_t;
typedef unsigned int   ucs4_t;

typedef enum
  {
    CP_UCS4    = SQL_DM_CP_UCS4,
    CP_UTF16   = SQL_DM_CP_UTF16,
    CP_UTF8    = SQL_DM_CP_UTF8
  }
IODBC_CHARSET;

#if defined(SIZEOF_WCHAR)

# if (SIZEOF_WCHAR == 2)
#  define CP_DEF  CP_UTF16
# else
#  define CP_DEF  CP_UCS4
# endif

#else

#  define CP_DEF  CP_UCS4

#endif



#define WCHAR_MAXSIZE  4


typedef struct _dm_conv
  {
    IODBC_CHARSET dm_cp;
    IODBC_CHARSET drv_cp;
  }
DM_CONV;


typedef enum
  {
    CD_NONE		= 0,
    CD_A2W		= 1,
    CD_W2A		= 2,
    CD_W2W		= 3
  }
CONV_DIRECT;



/*
 *  Max length of a UTF-8 encoded character sequence
 */
#define UTF8_MAX_CHAR_LEN	4	/* According to RFC3629 */

#ifndef MB_CUR_MAX
#define MB_CUR_MAX		UTF8_MAX_CHAR_LEN
#endif


/*
 *  Function Prototypes
 */
SQLCHAR *dm_SQL_W2A (SQLWCHAR * inStr, int size);
SQLCHAR *dm_SQL_WtoU8 (SQLWCHAR * inStr, int size);
SQLCHAR *dm_strcpy_W2A (SQLCHAR * destStr, SQLWCHAR * sourStr);

SQLWCHAR *dm_SQL_A2W (SQLCHAR * inStr, int size);
SQLWCHAR *dm_SQL_U8toW (SQLCHAR * inStr, int size);
SQLWCHAR *dm_strcpy_A2W (SQLWCHAR * destStr, SQLCHAR * sourStr);

int dm_StrCopyOut2_A2W (SQLCHAR * inStr, SQLWCHAR * outStr, SQLSMALLINT size,
    WORD * result);
int dm_StrCopyOut2_U8toW (SQLCHAR * inStr, SQLWCHAR * outStr, int size,
    WORD * result);
int dm_StrCopyOut2_W2A (SQLWCHAR * inStr, SQLCHAR * outStr, SQLSMALLINT size,
    WORD * result);


# ifdef WIN32
#define OPL_W2A(w, a, cb)     \
	WideCharToMultiByte(CP_ACP, 0, w, cb, a, cb, NULL, NULL)

#define OPL_A2W(a, w, cb)     \
	MultiByteToWideChar(CP_ACP, 0, a, cb, w, cb)

# else
#define OPL_W2A(XW, XA, SIZE)      wcstombs((char *) XA, (wchar_t *) XW, SIZE)
#define OPL_A2W(XA, XW, SIZE)      mbstowcs((wchar_t *) XW, (char *) XA, SIZE)
# endif

int dm_conv_W2W(void *inStr, int len, void *outStr, int size,
	IODBC_CHARSET icharset, IODBC_CHARSET ocharset);
int dm_conv_W2A(void *inStr, int inLen, char *outStr, int size,
	IODBC_CHARSET charset);
int dm_conv_A2W(char *inStr, int inLen, void *outStr, int size,
	IODBC_CHARSET charset);

void DM_strcpy_U8toW (DM_CONV *conv, void *dest, SQLCHAR *sour);

size_t DRV_WCHARSIZE(DM_CONV *conv);
size_t DM_WCHARSIZE(DM_CONV *conv);
size_t DRV_WCHARSIZE_ALLOC(DM_CONV *conv);
size_t DM_WCHARSIZE_ALLOC(DM_CONV *conv);

void *DM_A2W(DM_CONV *conv, SQLCHAR * inStr, int size);
SQLCHAR *DM_W2A(DM_CONV *conv, void * inStr, int size);
SQLCHAR *DRV_W2A(DM_CONV *conv, void * inStr, int size);

void DM_SetWCharAt(DM_CONV *conv, void *str, int pos, int ch);
void DRV_SetWCharAt(DM_CONV *conv, void *str, int pos, int ch);
SQLWCHAR DM_GetWCharAt(DM_CONV *conv, void *str, int pos);

void *DM_WCSCPY(DM_CONV *conv, void *dest, void *sour);
void *DM_WCSNCPY(DM_CONV *conv, void *dest, void *sour, size_t count);
void *DRV_WCSNCPY(DM_CONV *conv, void *dest, void *sour, size_t count);

size_t DM_WCSLEN(DM_CONV *conv, void *str);
size_t DRV_WCSLEN(DM_CONV *conv, void *str);

SQLCHAR *DM_WtoU8(DM_CONV *conv, void *inStr, int size);
SQLCHAR *DRV_WtoU8(DM_CONV *conv, void *inStr, int size);
void *DM_U8toW(DM_CONV *conv, SQLCHAR *inStr, int size);

int dm_StrCopyOut2_A2W_d2m (DM_CONV *conv, SQLCHAR *inStr,
		void *outStr, int size, SQLSMALLINT *result, int *copied);
int dm_StrCopyOut2_W2A_d2m (DM_CONV *conv, void *inStr,
		SQLCHAR *outStr, int size, SQLSMALLINT *result, int *copied);
int dm_StrCopyOut2_U8toW_d2m (DM_CONV *conv, SQLCHAR *inStr,
		void *outStr, int size, SQLSMALLINT *result, int *copied);
int dm_StrCopyOut2_W2W_d2m (DM_CONV *conv, void *inStr,
		void *outStr, int size, SQLSMALLINT *result, int *copied);

int dm_StrCopyOut2_W2A_m2d (DM_CONV *conv, void *inStr,
		SQLCHAR *outStr, int size, SQLSMALLINT *result, int *copied);
int dm_StrCopyOut2_W2W_m2d (DM_CONV *conv, void *inStr,
		void *outStr, int size, SQLSMALLINT *result, int *copied);


void *conv_text_d2m(DM_CONV *conv, void *inStr, int size,
	CONV_DIRECT direct);
void *conv_text_m2d(DM_CONV *conv, void *inStr, int size,
	CONV_DIRECT direct);

void * conv_text_m2d_W2W(DM_CONV *conv, void *inStr, SQLLEN size,
        SQLLEN *copied);



/*
 *  Replacement functions
 */
#if !defined(HAVE_WCSLEN)
size_t wcslen (const wchar_t * wcs);
#endif
#if !defined(HAVE_WCSCPY)
wchar_t * wcscpy (wchar_t * wcd, const wchar_t * wcs);
#endif
#if !defined(HAVE_WCSNCPY)
wchar_t * wcsncpy (wchar_t * wcd, const wchar_t * wcs, size_t n);
#endif
#if !defined(HAVE_WCSCHR)
wchar_t* wcschr(const wchar_t *wcs, const wchar_t wc);
#endif
#if !defined(HAVE_WCSCAT)
wchar_t* wcscat(wchar_t *dest, const wchar_t *src);
#endif
#if !defined(HAVE_WCSCMP)
int wcscmp (const wchar_t* s1, const wchar_t* s2);
#endif
#if !defined(HAVE_WCSNCASECMP)
int wcsncasecmp (const wchar_t* s1, const wchar_t* s2, size_t n);
#endif

#endif /* _UNICODE_H */
