This is DriveSCSI.m in view mode; [Download] [Up]
//
// DriveSCSI_Class - subclass of SCSI2_Class for disk drive devices
//
// Copyright (C) 1994 by Christopher Wolf.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// Bug-reports, comments and questions should be directed to:
// Christopher Wolf <chris@alchemy.geo.cornell.edu>
//
// Portions of this code and documentation are derived from an
// earlier work (SCSI Inquirer) Copyright (C) 1990, 1991, 1992 by
// Jiro Nakamura and used with permission.
//
//
// For best results view this file with a tab size of 4 and
// a display width of 132 columns or wider.
//
// file version information
#define RCSDSM "$Id: DriveSCSI.m,v 0.30 94/09/18 03:07:41 chris Exp Locker: chris $"
// generic Unix headers
#import <stdio.h>
#import <libc.h>
// SCSI2 class specific headers
#import "DriveSCSI.h"
// string constants
const char RCSdsm[] = RCSDSM;
const char RCSdsh[] = RCSDSH;
@implementation DriveSCSI
// ----------------------------------------------------------------------
//
// NAME
// isDevice
//
// RETURNS
// (BOOL) YES if sub-class can handle device, NO otherwise.
//
// EXPLANATION
// It is the sub-classes responsibility to implement this method.
// The method should return YES if the subclass of SCSI can handle
// the device at the current target, NO otherwise.
//
// SEE ALSO
// findDevice (SCSI), findDevice: (SCSI)
//
// ----------------------------------------------------------------------
- (BOOL) isDevice
{
struct inquiry2_reply ibuffer;
BOOL result = NO;
if ((![self inquiry: &ibuffer]) && (ibuffer.ir_devicetype == DEVTYPE_DISK))
{
result = YES;
}
return result;
}
// ----------------------------------------------------------------------
//
// NAME
// seekExtendedTo:
//
// RETURNS
// (int) 0 Seek succeeded
// (int) -1 Seek failed
//
// PARAMETERS
// (u_int) logicalBlockAddress logical block address to seek to
//
// EXPLANATION
// This implements the SCSI command ªSeek Extendedº. It must be
// passed a long integer logicalBlockAddress which to seek to.
// This method returns when the device has finished seeking.
// The method returns zero for success, non-zero otherwise.
//
// ----------------------------------------------------------------------
- (int) seekExtendedTo: (u_int) logicalBlockAddress
{
struct cdb2_10 *cdbp = (struct cdb2_10 *)&sr.sr_cdb.cdb_c10;
BOOL wasOpen = isOpen;
int result = -1;
if (wasOpen || ![self open])
{
[SCSI clearCommandBlock: (union cdb *) cdbp];
cdbp->c10_opcode = C10OP_SEEKEXTENDED;
cdbp->c10_lun = lun;
writeBigEndianLong(logicalBlockAddress, &cdbp->BE_c10_lba);
sr.sr_dma_dir = SR_DMA_RD;
sr.sr_addr = NULL;
sr.sr_dma_max = 0;
sr.sr_ioto = 10;
result = [self performRequest];
}
if (!wasOpen && [self close])
{
result = -1;
}
return(result);
}
// ----------------------------------------------------------------------
//
// NAME
// readExtendedFrom: to: numBytes: numBlocks:
//
// RETURNS
// (int) 0 read succeeded
// (int) -1 read failed
//
// PARAMETERS
// (u_int) lba logical block address to start read from
// (char *) destBuffer pointer to buffer to place data in
// (u_int) numBytes size of read in bytes
// (u_int) numBlock size of read in blocks
//
// EXPLANATION
// This implements the SCSI command ªRead Extendedº. It reads
// data starting from the specified logical block address into the
// specified buffer. The size of the read must be specified in
// BOTH number of bytes and number of blocks to be read. The
// method returns after the read has been completed. The method
// returns zero on success, non-zero otherwise.
//
// ----------------------------------------------------------------------
- (int) readExtendedFrom: (u_int)lba to: (char *)destBuffer numBytes: (u_int)numBytes numBlocks: (u_int) numBlocks
{
struct cdb2_10 *cdbp = (struct cdb2_10 *)&sr.sr_cdb.cdb_c10;
BOOL wasOpen = isOpen;
int result = -1;
if (wasOpen || ![self open])
{
[SCSI clearCommandBlock: (union cdb *) cdbp];
cdbp->c10_opcode = C10OP_READEXTENDED;
cdbp->c10_lun = lun;
writeBigEndianLong(lba, &cdbp->BE_c10_lba);
writeBigEndianShort(numBlocks, &cdbp->BE_c10_len);
sr.sr_dma_dir = SR_DMA_RD;
sr.sr_addr = destBuffer;
sr.sr_dma_max = numBytes;
sr.sr_ioto = 60*60;
result = [self performRequest];
}
if (!wasOpen && [self close])
{
result = -1;
}
return(result);
}
// ----------------------------------------------------------------------
//
// NAME
// formatUnit
//
// RETURNS
// (int) 0 format succeeded
// (int) -1 format failed
//
// EXPLANATION
// This implements the SCSI command ªFormat Unitº. It performs
// a low level format of the device. ALL DATA WILL BE ERASED!
// Use this command with caution.
//
// ----------------------------------------------------------------------
- (int) formatUnit
{
struct cdb_6 *cdbp = &sr.sr_cdb.cdb_c6;
BOOL wasOpen = isOpen;
int result = -1;
if (wasOpen || ![self open])
{
[SCSI clearCommandBlock: (union cdb *) cdbp];
cdbp->c6_opcode = C6OP_FORMAT;
cdbp->c6_lun = lun;
cdbp->c6_len = 0;
sr.sr_dma_dir = SR_DMA_WR;
sr.sr_addr = (char *) 0;
sr.sr_dma_max = 0;
sr.sr_ioto = 60*60*60;
result = [self performRequest];
}
if (!wasOpen && [self close])
{
result = -1;
}
return(result);
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.