/*  Copyright 1996,1997,1999,2001,2002,2008,2009 Alain Knaff.
 *  Copyright 2010 Volker Lanz (vl@fidra.de)
 *  This file is part of mtools.
 *
 *  Mtools 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Mtools 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 Mtools.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "msdos.h"
#include "stream.h"

#include <stdlib.h>

int flush_stream(struct Stream_t *Stream)
{
	int ret = 0;

	if(Stream->Class->flush)
		ret |= Stream->Class->flush(Stream);

	if(Stream->Next)
		ret |= flush_stream(Stream->Next);

	return ret;
}

struct Stream_t *copy_stream(struct Stream_t *Stream)
{
	if(Stream)
		Stream->refs++;

	return Stream;
}

int free_stream(struct Stream_t **Stream)
{
	if(!*Stream)
		return -1;

	int ret = 0;
	if(! --(*Stream)->refs)
	{
		if((*Stream)->Class->flush)
			ret |= (*Stream)->Class->flush(*Stream);

		if((*Stream)->Class->freeFunc)
			ret |= (*Stream)->Class->freeFunc(*Stream);

		if((*Stream)->Next)
			ret |= free_stream(&(*Stream)->Next);

		free(*Stream);
	}
	else if ((*Stream)->Next)
		ret |= flush_stream((*Stream)->Next);

	*Stream = NULL;

	return ret;
}


#define GET_DATA(stream, date, size, type, address) \
(stream)->Class->get_data( (stream), (date), (size), (type), (address) )


int get_data_pass_through(struct Stream_t *Stream, time_t *date, size_t *size, int *type, int *address)
{
	return GET_DATA(Stream->Next, date, size, type, address);
}

int read_pass_through(struct Stream_t *Stream, char *buf, off_t start, size_t len)
{
	return READS(Stream->Next, buf, start, len);
}

int write_pass_through(struct Stream_t *Stream, char *buf, off_t start, size_t len)
{
	return WRITES(Stream->Next, buf, start, len);
}

struct doscp_t *get_dosConvert_pass_through(struct Stream_t *Stream)
{
	return GET_DOSCONVERT(Stream->Next);
}