/*
 * example of Harbour codepage using CP950 encoding
 *
 * Copyright 2011 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file LICENSE.txt.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include "hbapi.h"
#include "hbapicdp.h"

#include "cp950.c"

static HB_CDP_GET_FUNC( CP950_get )
{
   *wc = 0;
   if( *pnIndex < nLen )
   {
      HB_UCHAR uc = pSrc[ ( *pnIndex )++ ];

      if( uc >= ( HB_CP950_FIRST >> 8 ) && uc <= ( HB_CP950_LAST >> 8 ) &&
          *pnIndex < nLen )
      {
         *wc = s_cp950_to_ucs16( ( ( int ) uc << 8 ) | ( HB_UCHAR ) pSrc[ *pnIndex ] );
         if( *wc )
         {
            ( *pnIndex )++;
            return HB_TRUE;
         }
      }
      *wc = cdp->uniTable->uniCodes[ uc ];
      if( *wc == 0 )
         *wc = uc;
      return HB_TRUE;
   }
   return HB_FALSE;
}

static HB_CDP_PUT_FUNC( CP950_put )
{
   if( *pnIndex < nLen )
   {
      HB_USHORT b5 = s_ucs16_to_cp950( wc );

      if( b5 )
      {
         if( *pnIndex + 1 < nLen )
         {
            HB_PUT_BE_UINT16( &pDst[ ( *pnIndex ) ], b5 );
            *pnIndex += 2;
            return HB_TRUE;
         }
      }
      else
      {
         if( cdp->uniTable->uniTrans == NULL )
            hb_cdpBuildTransTable( cdp->uniTable );

         if( wc <= cdp->uniTable->wcMax &&
             cdp->uniTable->uniTrans[ wc ] )
            pDst[ ( *pnIndex )++ ] = cdp->uniTable->uniTrans[ wc ];
         else
            pDst[ ( *pnIndex )++ ] = wc >= 0x100 ? '?' : ( HB_UCHAR ) wc;
         return HB_TRUE;
      }
   }
   return HB_FALSE;
}

static HB_CDP_LEN_FUNC( CP950_len )
{
   HB_USHORT b5 = s_ucs16_to_cp950( wc );

   HB_SYMBOL_UNUSED( cdp );

   return b5 ? 2 : 1;
}

static void hb_cp_init( PHB_CODEPAGE cdp )
{
   HB_UCHAR * flags, * upper, * lower;
   int i;

   cdp->buffer = ( HB_UCHAR * ) hb_xgrab( 0x300 );
   cdp->flags = flags = ( HB_UCHAR * ) cdp->buffer;
   cdp->upper = upper = ( HB_UCHAR * ) cdp->buffer + 0x100;
   cdp->lower = lower = ( HB_UCHAR * ) cdp->buffer + 0x200;

   for( i = 0; i < 0x100; ++i )
   {
      flags[ i ] = 0;
      if( HB_ISDIGIT( i ) )
         flags[ i ] |= HB_CDP_DIGIT;
      if( HB_ISALPHA( i ) )
         flags[ i ] |= HB_CDP_ALPHA;
      if( HB_ISUPPER( i ) )
         flags[ i ] |= HB_CDP_UPPER;
      if( HB_ISLOWER( i ) )
         flags[ i ] |= HB_CDP_LOWER;
      upper[ i ] = ( HB_UCHAR ) HB_TOUPPER( i );
      lower[ i ] = ( HB_UCHAR ) HB_TOLOWER( i );
   }

#if 0
   for( i = 0; i < 0x10000; ++i )
   {
      HB_WCHAR wc = s_cp950_to_ucs16( i );
      if( wc )
      {
         if( i != s_ucs16_to_cp950( wc ) )
         {
            printf( "irreversible translation: (CP950)%04X -> U+%04X -> (CP950)%04X\r\n",
                    i, wc, s_ucs16_to_cp950( wc ) );
            fflush(stdout);
         }
      }
   }
#endif
}

#define HB_CP_RAW

#define HB_CP_ID              CP950
#define HB_CP_INFO            "CP950"
#define HB_CP_UNITB           HB_UNITB_437

#define HB_CP_GET_FUNC        CP950_get
#define HB_CP_PUT_FUNC        CP950_put
#define HB_CP_LEN_FUNC        CP950_len

#define HB_CP_FLAGS_FUNC      NULL
#define HB_CP_UPPER_FUNC      NULL
#define HB_CP_LOWER_FUNC      NULL

#define HB_CP_CMP_FUNC        NULL

#define s_flags               NULL
#define s_upper               NULL
#define s_lower               NULL
#define s_sort                NULL

#define HB_CP_INIT hb_cp_init

/* include CP registration code */
#include "hbcdpreg.h"