cleanup/cdrecord/movesect.c

/*
 * 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 */
#ifndef lint
static  char sccsid[] =
        "@(#)movesect.c 1.3 04/03/02 Copyright 2001, 2004 J. Schilling";
#endif
/*
 *      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 "cdrecord.h"
#include "movesect.h"

void    scatter_secs    __PR((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;
                }
        }
}
1	/*
2	* This file has been modified for the cdrkit suite.
3	*
4	* The behaviour and appearence of the program code below can differ to a major
5	* extent from the version distributed by the original author(s).
6	*
7	* For details, see Changelog file distributed with the cdrkit package. If you
8	* received this file from another source then ask the distributing person for
9	* a log of modifications.
10	*
11	*/
12
13	/* @(#)movesect.c 1.3 04/03/02 Copyright 2001, 2004 J. Schilling */
14	#ifndef lint
15	static char sccsid[] =
16	"@(#)movesect.c 1.3 04/03/02 Copyright 2001, 2004 J. Schilling";
17	#endif
18	/*
19	* Copyright (c) 2001, 2004 J. Schilling
20	*/
21	/*
22	* This program is free software; you can redistribute it and/or modify
23	* it under the terms of the GNU General Public License version 2
24	* as published by the Free Software Foundation.
25	*
26	* This program is distributed in the hope that it will be useful,
27	* but WITHOUT ANY WARRANTY; without even the implied warranty of
28	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29	* GNU General Public License for more details.
30	*
31	* You should have received a copy of the GNU General Public License along with
32	* this program; see the file COPYING. If not, write to the Free Software
33	* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34	*/
35
36	#include <mconfig.h>
37	#include <standard.h>
38	#include <utypes.h>
39	#include <schily.h>
40
41	#include "cdrecord.h"
42	#include "movesect.h"
43
44	void scatter_secs __PR((track_t trackp, char bp, int nsecs));
45
46	/*
47	* Scatter input sector size records over buffer to make them
48	* output sector size.
49	*
50	* If input sector size is less than output sector size,
51	*
52	* \| sector_0 \|\| sector_1 \|\| ... \|\| sector_n \|\|
53	*
54	* will be convterted into:
55	*
56	* \| sector_0 \|grass\|\| sector_1 \|grass\|\| ... \|\| sector_n \|grass\|\|
57	*
58	* Sector_n must me moved n * grass_size forward,
59	* Sector_1 must me moved 1 * grass_size forward
60	*
61	*
62	* If output sector size is less than input sector size,
63	*
64	* \| sector_0 \|grass\|\| sector_1 \|grass\|\| ... \|\| sector_n \|grass\|\|
65	*
66	* will be convterted into:
67	*
68	* \| sector_0 \|\| sector_1 \|\| ... \|\| sector_n \|\|
69	*
70	* Sector_1 must me moved 1 * grass_size backward,
71	* Sector_n must me moved n * grass_size backward,
72	*
73	* Sector_0 must never be moved.
74	*/
75	void
76	scatter_secs(track_t trackp, char bp, int nsecs)
77	{
78	char *from;
79	char *to;
80	int isecsize = trackp->isecsize;
81	int secsize = trackp->secsize;
82	int i;
83
84	if (secsize == isecsize)
85	return;
86
87	nsecs -= 1; /* we do not move sector # 0 */
88
89	if (secsize < isecsize) {
90	from = bp + isecsize;
91	to = bp + secsize;
92
93	for (i = nsecs; i > 0; i--) {
94	movebytes(from, to, secsize);
95	from += isecsize;
96	to += secsize;
97	}
98	} else {
99	from = bp + (nsecs * isecsize);
100	to = bp + (nsecs * secsize);
101
102	for (i = nsecs; i > 0; i--) {
103	movebytes(from, to, isecsize);
104	from -= isecsize;
105	to -= secsize;
106	}
107	}
108	}