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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)movesect.c 1.3 04/03/02 Copyright 2001, 2004 J. Schilling */
/*
* Copyright (c) 2001, 2004 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <mconfig.h>
#include <standard.h>
#include <utypes.h>
#include <schily.h>
#include "wodim.h"
#include "movesect.h"
void scatter_secs(track_t *trackp, char *bp, int nsecs);
/*
* Scatter input sector size records over buffer to make them
* output sector size.
*
* If input sector size is less than output sector size,
*
* | sector_0 || sector_1 || ... || sector_n ||
*
* will be convterted into:
*
* | sector_0 |grass|| sector_1 |grass|| ... || sector_n |grass||
*
* Sector_n must me moved n * grass_size forward,
* Sector_1 must me moved 1 * grass_size forward
*
*
* If output sector size is less than input sector size,
*
* | sector_0 |grass|| sector_1 |grass|| ... || sector_n |grass||
*
* will be convterted into:
*
* | sector_0 || sector_1 || ... || sector_n ||
*
* Sector_1 must me moved 1 * grass_size backward,
* Sector_n must me moved n * grass_size backward,
*
* Sector_0 must never be moved.
*/
void
scatter_secs(track_t *trackp, char *bp, int nsecs)
{
char *from;
char *to;
int isecsize = trackp->isecsize;
int secsize = trackp->secsize;
int i;
if (secsize == isecsize)
return;
nsecs -= 1; /* we do not move sector # 0 */
if (secsize < isecsize) {
from = bp + isecsize;
to = bp + secsize;
for (i = nsecs; i > 0; i--) {
movebytes(from, to, secsize);
from += isecsize;
to += secsize;
}
} else {
from = bp + (nsecs * isecsize);
to = bp + (nsecs * secsize);
for (i = nsecs; i > 0; i--) {
movebytes(from, to, isecsize);
from -= isecsize;
to -= secsize;
}
}
}
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