98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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/* @(#)movesect.c 1.6 09/07/05 Copyright 2001, 2004-2009 J. Schilling */
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#include <schily/mconfig.h>
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#ifndef lint
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static UConst char sccsid[] =
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"@(#)movesect.c 1.6 09/07/05 Copyright 2001, 2004-2009 J. Schilling";
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#endif
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/*
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* Copyright (c) 2001, 2004-2009 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#include <schily/mconfig.h>
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#include <schily/standard.h>
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#include <schily/utypes.h>
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#include <schily/schily.h>
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#include "cdrecord.h"
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#include "movesect.h"
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EXPORT void scatter_secs __PR((track_t *trackp, char *bp, int nsecs));
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/*
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* Scatter input sector size records over buffer to make them
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* output sector size.
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*
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* If input sector size is less than output sector size,
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*
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* | sector_0 || sector_1 || ... || sector_n ||
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*
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* will be convterted into:
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*
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* | sector_0 |grass|| sector_1 |grass|| ... || sector_n |grass||
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*
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* Sector_n must me moved n * grass_size forward,
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* Sector_1 must me moved 1 * grass_size forward
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*
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*
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* If output sector size is less than input sector size,
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*
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* | sector_0 |grass|| sector_1 |grass|| ... || sector_n |grass||
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*
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* will be convterted into:
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*
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* | sector_0 || sector_1 || ... || sector_n ||
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*
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* Sector_1 must me moved 1 * grass_size backward,
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* Sector_n must me moved n * grass_size backward,
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*
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* Sector_0 must never be moved.
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*/
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EXPORT void
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scatter_secs(trackp, bp, nsecs)
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track_t *trackp;
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char *bp;
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int nsecs;
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{
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char *from;
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char *to;
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int isecsize = trackp->isecsize;
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int secsize = trackp->secsize;
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int i;
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if (secsize == isecsize)
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return;
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nsecs -= 1; /* we do not move sector # 0 */
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if (secsize < isecsize) {
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from = bp + isecsize;
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to = bp + secsize;
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for (i = nsecs; i > 0; i--) {
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movebytes(from, to, secsize);
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from += isecsize;
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to += secsize;
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}
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} else {
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from = bp + (nsecs * isecsize);
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to = bp + (nsecs * secsize);
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for (i = nsecs; i > 0; i--) {
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movebytes(from, to, isecsize);
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from -= isecsize;
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to -= secsize;
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}
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}
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}
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