gambas-source-code/main/lib/compress/CCompress.c

/***************************************************************************

	CCompress.c

	(c) 2003-2004 Daniel Campos Fern<EFBFBD>dez <danielcampos@netcourrier.com>

	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; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	MA 02110-1301, USA.

***************************************************************************/

#define __CCOMPRESS_C


#include "CCompress.h"
#include "main.h"
#include <stdio.h>

#define Check_Driver()  if (!THIS->driver) { GB.Error("No driver specified"); return; }

#define Check_Level() 	if (!MISSING(Level)) \
				level=VARG(Level); \
			else \
				level=THIS->driver->default_compression(); \
									\
			if ( (level < THIS->driver->min_compression()) || (level > THIS->driver->max_compression()) ) \
			if (level != THIS->driver->default_compression()) \
			{ \
				GB.Error("Invalid compression level"); \
				return; \
			} 

//*************************************************************************
//############################### COMPRESS ################################
//*************************************************************************

/*************************************************
Gambas object "Constructor"
*************************************************/
BEGIN_METHOD_VOID(CCOMPRESS_new)

	THIS->driver=NULL;
	THIS->stream.desc=NULL;

END_METHOD
/*************************************************
Gambas object "Destructor"
*************************************************/
BEGIN_METHOD_VOID(CCOMPRESS_free)

	

END_METHOD

BEGIN_METHOD (CCOMPRESS_String,GB_STRING Source;GB_INTEGER Level;GB_BOOLEAN AllowGrow;)

	int level;
	char *target=NULL;
	unsigned int lent;
	int allow=0;
	
	Check_Driver();
	Check_Level();
	lent=0;
	if (!MISSING(AllowGrow)) 
		if ( VARG(AllowGrow) ) allow=1;
	
	THIS->driver->Compress.String(&target,&lent,STRING(Source),LENGTH(Source),level);
		
	if (!lent) { GB.ReturnVoidString(); return; }
	if ( (!allow) && (LENGTH(Source)<=lent) ) 
	{
		if (target) GB.Free(POINTER(&target)); 
		GB.ReturnNewString (STRING(Source),LENGTH(Source)); 
		return; 
	}
	
	GB.ReturnNewString (target,lent);
	if (target) GB.Free(POINTER(&target));
	
END_METHOD


BEGIN_METHOD (CCOMPRESS_File,GB_STRING Source;GB_STRING Target;GB_INTEGER Level;)

	int level;
	
	Check_Driver();
	Check_Level();
	THIS->driver->Compress.File(STRING(Source),STRING(Target),level);
	
	


END_METHOD

BEGIN_METHOD (CCOMPRESS_Open,GB_STRING Path;GB_INTEGER Level;)

	int level;

	Check_Driver();
	Check_Level();
	
	if (THIS->stream.desc) 
	{
		GB.Error ("File is already opened");
		return;
	}
	
	THIS->driver->Compress.Open(STRING(Path),level,&THIS->stream);

END_METHOD

BEGIN_PROPERTY ( COMPRESS_Min )

	if (!THIS->driver) { GB.ReturnInteger(0); return; }
	GB.ReturnInteger(THIS->driver->min_compression());

END_PROPERTY

BEGIN_PROPERTY ( COMPRESS_Max )

	if (!THIS->driver) { GB.ReturnInteger(0); return; }
	GB.ReturnInteger(THIS->driver->max_compression());

END_PROPERTY

BEGIN_PROPERTY ( COMPRESS_Default )

	if (!THIS->driver) { GB.ReturnInteger(0); return; }
	GB.ReturnInteger(THIS->driver->default_compression());

END_PROPERTY

BEGIN_PROPERTY ( COMPRESS_Type )

	if (READ_PROPERTY)
	{
		if (!THIS->driver) { GB.ReturnVoidString(); return; }
		GB.ReturnNewZeroString(THIS->driver->name);
		return;
	}
	
	if (THIS->stream.desc) { GB.Error("Type can not be changed while the stream is opened"); return; }
	
	if (!(THIS->driver = COMPRESS_GetDriver(GB.ToZeroString(PROP(GB_STRING)))))
		GB.Error("Cannot find driver &1", GB.ToZeroString(PROP(GB_STRING)));

END_PROPERTY

/*******************************************************************
Interface declaration
*******************************************************************/
GB_DESC CCompressDesc[] =
{

	GB_DECLARE("Compress", sizeof(CCOMPRESS)),
	
	GB_INHERITS("Stream"),
	
	GB_PROPERTY_READ("Min","i",COMPRESS_Min),
	GB_PROPERTY_READ("Max","i",COMPRESS_Max),
	GB_PROPERTY_READ("Default","i",COMPRESS_Default),
	GB_PROPERTY("Type","s",COMPRESS_Type),

	GB_METHOD("_new", NULL, CCOMPRESS_new,NULL),
	GB_METHOD("_free", NULL, CCOMPRESS_free, NULL),
	
	GB_METHOD("String","s",CCOMPRESS_String,"(Source)s[(Level)i(AllowGrow)b]"),
	GB_METHOD("File",NULL,CCOMPRESS_File,"(Source)s(Target)s[(Level)i]"),
	GB_METHOD("Open",NULL,CCOMPRESS_Open,"(Path)s[(Level)i]"),
		
	GB_END_DECLARE
};