9f16c2bf8e
* *
* update copyright headers with new FSF postal address
* COPYING.txt -> LICENSE.txt (rest of repo to be synced)
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/*
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* CT3 CharPack() and CharUnpack() functions.
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*
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* Copyright 2004 Phil Krylov <phil@newstar.rinet.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file LICENSE.txt. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#include "hbapi.h"
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HB_FUNC( CHARPACK )
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{
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HB_SIZE len = hb_parclen( 1 );
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const HB_UCHAR * in = ( const HB_UCHAR * ) hb_parcx( 1 );
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if( hb_parni( 2 ) == 0 )
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{
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HB_UCHAR * out = ( HB_UCHAR * ) hb_xgrab( len * 3 + 2 );
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HB_SIZE n_in = 0, n_out = 0;
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out[ n_out++ ] = 158;
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out[ n_out++ ] = 158;
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while( n_in < len )
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{
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HB_ISIZ n_count = 1, n_max = HB_MIN( 255, len - n_in );
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HB_UCHAR c = in[ n_in ];
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while( n_count < n_max && in[ n_in + n_count ] == c )
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n_count++;
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out[ n_out++ ] = 0;
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out[ n_out++ ] = ( HB_UCHAR ) n_count;
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out[ n_out++ ] = c;
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n_in += n_count;
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}
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if( n_out < len )
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hb_retclen( ( const char * ) out, n_out );
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hb_xfree( out );
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if( n_out < len )
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return;
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}
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hb_retclen( ( const char * ) in, len );
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}
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static HB_UCHAR * buf_append( HB_UCHAR * buf, HB_SIZE * buf_size, HB_SIZE count,
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HB_UCHAR c, HB_SIZE * buf_len )
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{
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if( *buf_len + count > *buf_size )
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{
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*buf_size = HB_MAX( *buf_len + count, *buf_size + 32768 );
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buf = ( HB_UCHAR * ) hb_xrealloc( buf, *buf_size );
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}
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memset( buf + *buf_len, c, count );
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*buf_len += count;
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return buf;
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}
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HB_FUNC( CHARUNPACK )
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{
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HB_SIZE len = hb_parclen( 1 );
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const HB_UCHAR * in = ( const HB_UCHAR * ) hb_parcx( 1 );
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if( hb_parni( 2 ) == 0 )
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{
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HB_UCHAR * out;
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HB_SIZE out_len = 0;
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HB_SIZE buf_size = 32768;
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HB_SIZE i;
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if( ! ( in[ 0 ] == 158 && in[ 1 ] == 158 ) )
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{
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hb_retclen( ( const char * ) in, len );
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return;
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}
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out = ( HB_UCHAR * ) hb_xgrab( buf_size );
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for( i = 2; i <= len - 3; i += 3 )
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{
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if( in[ i ] != 0 )
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{
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hb_xfree( out );
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hb_retclen( ( const char * ) in, len );
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return;
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}
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out = buf_append( out, &buf_size, in[ i + 1 ], in[ i + 2 ], &out_len );
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}
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hb_retclen( ( const char * ) out, out_len );
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hb_xfree( out );
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return;
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}
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hb_retclen( ( const char * ) in, len );
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}
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