554b24e453
* contrib/xhb/hbchksum.c
* contrib/xhb/hbcomprs.c
- contrib/xhb/hbcomprs.h
+ contrib/xhb/hbcomprs.ch
- Removed unnecessary C header.
+ Added xhb compatibility .ch header.
290 lines
7.2 KiB
C
290 lines
7.2 KiB
C
/*
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* $Id$
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*/
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/*
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* xHarbour Project source code:
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* Compression related functions
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*
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* Copyright 2003 Giancarlo Niccolai <giancarlo@niccolai.ws>
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* www - http://www.xharbour.org
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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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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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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#include "hbapiitm.h"
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#include "hbstack.h"
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#include "hbapierr.h"
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#include "hbvm.h"
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#include "hbzlib.h"
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/*******************************************************************
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* Giancarlo Niccolai:
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* Calculates the minimum length of destination buffer
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*/
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int s_hb_compress_error;
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ULONG hb_destBuflen( ULONG srclen )
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{
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ULONG ret = srclen;
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ret += ret / 100*15 + 12;
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if ( srclen % 100 != 0 ) ret+=15;
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return ret;
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}
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/****** COMPRESSOR WRAPPER *****
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* HB_COMPRESS( cSource [, nSourceLen ] ) --> cDest
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* HB_COMPRESS( nComprFactor, cSource [,nSourceLen ] ) --> cDest
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* HB_COMPRESS( cSource, nSourceLen, @cDest, @nDestLen ) --> nError
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* HB_COMPRESS( nComprFactor, cSource, nSourceLen, @cDest, @nDestLen ) --> nError
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*/
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HB_FUNC( HB_COMPRESS )
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{
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char *cDest, *cSource;
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ULONG ulSrclen, ulDstlen, ulBufLen;
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PHB_ITEM pSource, pDest =NULL, pDestLen = NULL;
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int nCompFactor, iFirst;
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int cerr;
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if ( ISNUM(1) )
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{
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nCompFactor = hb_parni( 1 );
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iFirst = 1;
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}
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else
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{
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nCompFactor = Z_DEFAULT_COMPRESSION;
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iFirst = 0;
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}
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pSource = hb_param( iFirst + 1, HB_IT_STRING );
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if( pSource == NULL )
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{
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hb_errRT_BASE_SubstR( EG_ARG, 3012, NULL, HB_ERR_FUNCNAME, 1, hb_paramError(1) );
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return;
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}
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cSource = hb_itemGetCPtr( pSource );
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if (hb_pcount() > iFirst + 1 )
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{
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ulSrclen = (ULONG) hb_parnl( iFirst + 2 );
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}
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else
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{
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ulSrclen = hb_itemGetCLen( pSource );
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}
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/* Allocation mode: user provided or allocated here */
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if ( hb_pcount() == iFirst + 4 )
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{
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pDest = hb_param( iFirst + 3, HB_IT_BYREF);
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pDestLen = hb_param( iFirst + 4, HB_IT_BYREF);
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ulDstlen = hb_parnl( iFirst + 4 );
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cDest = NULL;
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ulBufLen = 0;
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if( pDest && pDestLen && ulDstlen > 0 )
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{
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pDest = hb_itemUnShare( pDest );
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if( HB_IS_STRING( pDest ) )
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{
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cDest = hb_itemGetCPtr( pDest );
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ulBufLen = hb_itemGetCLen( pDest );
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}
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}
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if( cDest == NULL || ulBufLen < ulDstlen )
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{
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hb_errRT_BASE_SubstR( EG_ARG, 3012, NULL, HB_ERR_FUNCNAME, 1, hb_paramError(1) );
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return;
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}
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}
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else
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{
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ulDstlen = hb_destBuflen( ulSrclen );
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cDest = (char *) hb_xgrab( ulDstlen + 1 );
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}
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cerr = compress2( ( Bytef * ) cDest, &ulDstlen, ( const Bytef * ) cSource, ulSrclen, nCompFactor );
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if ( cerr != Z_OK )
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{
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if ( pDest != NULL )
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{
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hb_retni( cerr );
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}
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else
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{
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hb_xfree( cDest );
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hb_ret();
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}
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}
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else
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{
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if (pDestLen != NULL )
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{
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hb_stornl( iFirst + 4, ( LONG ) ulDstlen );
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hb_retni( Z_OK );
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}
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else
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{
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hb_retclenAdopt( cDest, ulDstlen );
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}
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}
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s_hb_compress_error = cerr;
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}
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/****** DECOMPRESSOR WRAPPER *****
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* HB_UNCOMPRESS( nDestLen, cSource [, nSourceLen ] ) --> cDest
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* HB_UNCOMPRESS( nDestLen, cSource, nSourceLen, @cDest ) --> nError
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*/
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HB_FUNC( HB_UNCOMPRESS )
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{
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char *cDest, *cSource;
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ULONG ulSrclen, ulDstlen, ulBufLen;
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PHB_ITEM pSource, pDest;
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int cerr;
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pSource = hb_param( 2, HB_IT_STRING );
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if( ! ISNUM(1) || pSource == NULL )
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{
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hb_errRT_BASE_SubstR( EG_ARG, 3012, NULL, HB_ERR_FUNCNAME, 1, hb_paramError(1) );
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return;
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}
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cSource = hb_itemGetCPtr( pSource );
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ulDstlen = (ULONG) hb_parnl( 1 );
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if (hb_pcount() > 2 )
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{
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ulSrclen = (ULONG) hb_parnl( 3 );
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}
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else
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{
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ulSrclen = hb_itemGetCLen( pSource );
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}
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/* Allocation mode: user provided or allocated here */
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if ( hb_pcount() == 4 )
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{
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pDest = hb_param( 4, HB_IT_BYREF);
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cDest = NULL;
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ulBufLen = 0;
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if( pDest )
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{
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pDest = hb_itemUnShare( pDest );
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if( HB_IS_STRING( pDest ) )
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{
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cDest = hb_itemGetCPtr( pDest );
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ulBufLen = hb_itemGetCLen( pDest );
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}
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}
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if( cDest == NULL || ulBufLen < ulDstlen )
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{
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hb_errRT_BASE_SubstR( EG_ARG, 3012, NULL, HB_ERR_FUNCNAME, 1, hb_paramError(1) );
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return;
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}
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}
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else
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{
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cDest = (char *) hb_xgrab( ulDstlen + 1 );
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}
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cerr = uncompress( ( Bytef * ) cDest, &ulDstlen, ( const Bytef * ) cSource, ulSrclen );
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if ( cerr != Z_OK )
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{
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if ( hb_pcount() == 4 )
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{
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hb_retni( cerr );
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}
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else
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{
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hb_xfree( cDest );
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hb_ret();
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}
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}
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else
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{
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if ( hb_pcount() == 4 )
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{
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hb_retni( Z_OK );
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}
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else
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{
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hb_retclenAdopt( cDest, ulDstlen );
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}
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}
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s_hb_compress_error = cerr;
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}
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/*********************************
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* HB_COMPRESSERROR() --> nError
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*/
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HB_FUNC( HB_COMPRESSERROR )
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{
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hb_retni( s_hb_compress_error );
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}
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/*********************************
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* HB_COMPRESSERRORDESC( nErrorCode ) --> cDesc
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*/
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HB_FUNC( HB_COMPRESSERRORDESC )
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{
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hb_retcAdopt( hb_strdup( zError( hb_parni( 1 ) ) ) );
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}
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/*******************************
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* HB_COMPRESSBUFLEN( nSrcLen ) -->nDestLen
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*/
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HB_FUNC( HB_COMPRESSBUFLEN )
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{
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hb_retnl( (LONG) hb_destBuflen( hb_parni(1) ) );
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}
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