scsi.c
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上传日期:2007-01-06
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文件大小:4k
- /* @(#)scsi.c 1.12 00/01/08 Copyright 1997 J. Schilling */
- #ifndef lint
- static char sccsid[] =
- "@(#)scsi.c 1.12 00/01/08 Copyright 1997 J. Schilling";
- #endif
- /*
- * Copyright (c) 1997 J. Schilling
- */
- /*
- * 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; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #ifdef USE_SCG
- #include <mconfig.h>
- #include <stdio.h>
- #include <standard.h>
- #include <stdxlib.h>
- #include <unixstd.h>
- #include "mkisofs.h"
- #include <scg/scsireg.h>
- #include <scg/scsitransp.h>
- #include "cdrecord.h"
- /*
- * NOTICE: You should not make BUF_SIZE more than
- * the buffer size of the CD-Recorder.
- *
- * Do not set BUF_SIZE to be more than 126 KBytes
- * if you are running cdrecord on a sun4c machine.
- *
- * WARNING: Philips CDD 521 dies if BUF_SIZE is to big.
- */
- #define BUF_SIZE (62*1024) /* Must be a multiple of 2048 */
- LOCAL SCSI *scgp;
- LOCAL long bufsize; /* The size of the transfer buffer */
- int
- readsecs(startsecno, buffer, sectorcount)
- int startsecno;
- void *buffer;
- int sectorcount;
- {
- int f;
- int secsize; /* The drive's SCSI sector size */
- long amount; /* The number of bytes to be transfered */
- long secno; /* The sector number to read from */
- long secnum; /* The number of sectors to read */
- char *bp;
- long amt;
- if (in_image == NULL) {
- /*
- * We are using the standard CD-ROM sectorsize of 2048 bytes
- * while the drive may be switched to 512 bytes per sector.
- *
- * XXX We assume that secsize is no more than SECTOR_SIZE
- * XXX and that SECTOR_SIZE / secsize is not a fraction.
- */
- secsize = scgp->cap->c_bsize;
- amount = sectorcount * SECTOR_SIZE;
- secno = startsecno * (SECTOR_SIZE / secsize);
- bp = buffer;
- while (amount > 0) {
- amt = amount;
- if (amount > bufsize)
- amt = bufsize;
- secnum = amt / secsize;
- if (read_scsi(scgp, bp, secno, secnum) < 0 ||
- scsigetresid(scgp) != 0) {
- #ifdef OLD
- return (-1);
- #else
- comerr("Read error on old imagen");
- #endif
- }
- amount -= secnum * secsize;
- bp += secnum * secsize;
- secno += secnum;
- }
- return (SECTOR_SIZE * sectorcount);
- }
- f = fileno(in_image);
- if (lseek(f, (off_t)startsecno * SECTOR_SIZE, 0) == (off_t)-1) {
- #ifdef USE_LIBSCHILY
- comerr("Seek error on old imagen");
- #else
- fprintf(stderr,"Seek error on old imagen");
- exit(10);
- #endif
- }
- if( read(f, buffer, (sectorcount * SECTOR_SIZE))
- != (sectorcount * SECTOR_SIZE) )
- {
- #ifdef USE_LIBSCHILY
- comerr("Read error on old imagen");
- #else
- fprintf(stderr," Read error on old imagen");
- exit(10);
- #endif
- }
- return sectorcount * SECTOR_SIZE;
- }
- int
- scsidev_open(path)
- char *path;
- {
- char errstr[80];
- char *buf; /* ignored, bit OS/2 ASPI layer needs memory which
- has been allocated by scsi_getbuf() */
- /* path, debug, verboseopen */
- scgp = open_scsi(path, errstr, sizeof(errstr), 0, 0);
- if (scgp == 0) {
- errmsg("%s%sCannot open SCSI driver.n", errstr, errstr[0]?". ":"");
- return (-1);
- }
- bufsize = scsi_bufsize(scgp, BUF_SIZE);
- if ((buf = scsi_getbuf(scgp, bufsize)) == NULL) {
- errmsg("Cannot get SCSI I/O buffer.n");
- close_scsi(scgp);
- return (-1);
- }
- bufsize = (bufsize / SECTOR_SIZE) * SECTOR_SIZE;
- allow_atapi(scgp, TRUE);
- if (!wait_unit_ready(scgp, 60)) {/* Eat Unit att / Wait for drive */
- scgp->silent--;
- return (-1);
- }
- scgp->silent++;
- read_capacity(scgp); /* Set Capacity/Sectorsize for I/O */
- scgp->silent--;
- return (1);
- }
- #endif /* USE_SCG */