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CD-ROM Aktief 1995 #3
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CDA3.iso
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os2
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diskio14.rar
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DISKACC2.C
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C/C++ Source or Header
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1994-07-08
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5KB
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212 lines
/* diskacc2.c - direct disk access library for OS/2 2.x protected mode.
*
* Author: Kai Uwe Rommel <rommel@ars.muc.de>
* Created: Fri Jul 08 1994
*/
static char *rcsid =
"$Id: diskacc2.c,v 1.1 1994/07/08 21:34:12 rommel Exp $";
static char *rcsrev = "$Revision: 1.1 $";
/*
* $Log: diskacc2.c,v $
* Revision 1.1 1994/07/08 21:34:12 rommel
* Initial revision
*
*/
#define INCL_DOSDEVICES
#define INCL_DOSDEVIOCTL
#define INCL_NOPM
#include <os2.h>
#include <string.h>
#include <ctype.h>
#include "diskacc2.h"
#define PHYSICAL 0x1000
#define CATEGORY(x) (((x) & PHYSICAL) ? IOCTL_PHYSICALDISK : IOCTL_DISK)
#define HANDLE(x) ((x) & ~PHYSICAL)
#pragma pack(1)
typedef struct
{
BYTE bCommand;
USHORT usHead;
USHORT usCylinder;
USHORT usFirstSector;
USHORT cSectors;
struct
{
USHORT usSectorNumber;
USHORT usSectorSize;
}
TrackTable[64];
}
TRACK;
ULONG DosDevIOCtl32(PVOID pData, ULONG cbData, PVOID pParms, ULONG cbParms,
ULONG usFunction, HFILE hDevice)
{
ULONG ulParmLengthInOut = cbParms, ulDataLengthInOut = cbData;
return DosDevIOCtl(HANDLE(hDevice), CATEGORY(hDevice), usFunction,
pParms, cbParms, &ulParmLengthInOut,
pData, cbData, &ulDataLengthInOut);
}
static int test_sector(int handle, int side, int track, int sector)
{
char buffer[1024];
TRACK trk;
trk.bCommand = 0;
trk.usHead = side;
trk.usCylinder = track;
trk.usFirstSector = 0;
trk.cSectors = 1;
trk.TrackTable[0].usSectorNumber = sector;
trk.TrackTable[0].usSectorSize = 512;
return DosDevIOCtl32(buffer, sizeof(buffer), &trk, sizeof(trk),
DSK_READTRACK, handle) == 0;
}
int DskOpen(char *drv, int lock,
unsigned *sides, unsigned *tracks, unsigned *sectors)
{
BIOSPARAMETERBLOCK bpb;
DEVICEPARAMETERBLOCK dpb;
HFILE handle;
USHORT physical;
ULONG action;
BYTE cmd = 0;
if (isalpha(drv[0]) && drv[1] == ':' && drv[2] == 0)
{
if (DosOpen(drv, &handle, &action, 0L, FILE_NORMAL, FILE_OPEN,
OPEN_FLAGS_DASD | OPEN_FLAGS_FAIL_ON_ERROR |
OPEN_ACCESS_READWRITE | OPEN_SHARE_DENYREADWRITE, 0L))
return -1;
}
else if (drv[0] == '$' && isdigit(drv[1]) && drv[2] == ':' && drv[3] == 0)
{
if (DosPhysicalDisk(INFO_GETIOCTLHANDLE, &physical, sizeof(physical),
drv + 1, strlen(drv + 1) + 1))
return -1;
handle = physical | PHYSICAL;
}
else
return -1;
if (handle & PHYSICAL)
{
if (DosDevIOCtl32(&dpb, sizeof(dpb), &cmd, sizeof(cmd),
DSK_GETDEVICEPARAMS, handle))
{
DosPhysicalDisk(INFO_FREEIOCTLHANDLE, NULL, 0, &physical, sizeof(physical));
return -1;
}
*sectors = dpb.cSectorsPerTrack;
*tracks = dpb.cCylinders;
*sides = dpb.cHeads;
}
else
{
if (DosDevIOCtl32(&bpb, sizeof(bpb), &cmd, sizeof(cmd),
DSK_GETDEVICEPARAMS, handle))
{
DosClose(handle);
return -1;
}
*sectors = bpb.usSectorsPerTrack;
*tracks = bpb.cCylinders;
*sides = bpb.cHeads;
}
if (lock && DosDevIOCtl32(0L, 0, &cmd, sizeof(cmd), DSK_LOCKDRIVE, handle))
{
if (handle & PHYSICAL)
DosPhysicalDisk(INFO_FREEIOCTLHANDLE, NULL, 0, &physical, sizeof(physical));
else
DosClose(handle);
return -1;
}
if (*sectors >= 15) /* 360k floppies ... */
if (!test_sector(handle, 0, 0, 15))
{
if (*sectors == 15)
*tracks = 40;
*sectors = 9;
}
return handle;
}
int DskClose(int handle)
{
BYTE cmd = 0;
USHORT physical = handle & ~PHYSICAL;
DosDevIOCtl32(0L, 0, &cmd, sizeof(cmd), DSK_UNLOCKDRIVE, handle);
if (handle & PHYSICAL)
return DosPhysicalDisk(INFO_FREEIOCTLHANDLE, NULL, 0,
&physical, sizeof(physical));
else
return DosClose(handle);
}
int DskRead(int handle, unsigned side, unsigned track,
unsigned sector, unsigned nsects, void *buf)
{
TRACK trk;
unsigned cnt;
trk.bCommand = 0;
trk.usHead = side;
trk.usCylinder = track;
trk.usFirstSector = 0;
trk.cSectors = nsects;
for (cnt = 0; cnt < nsects; cnt++)
{
trk.TrackTable[cnt].usSectorNumber = sector + cnt;
trk.TrackTable[cnt].usSectorSize = 512;
}
return DosDevIOCtl32(buf, nsects * 512, &trk, sizeof(trk),
DSK_READTRACK, handle);
}
int DskWrite(int handle, unsigned side, unsigned track,
unsigned sector, unsigned nsects, void *buf)
{
TRACK trk;
unsigned cnt;
trk.bCommand = 0;
trk.usHead = side;
trk.usCylinder = track;
trk.usFirstSector = 0;
trk.cSectors = nsects;
for (cnt = 0; cnt < nsects; cnt++)
{
trk.TrackTable[cnt].usSectorNumber = sector + cnt;
trk.TrackTable[cnt].usSectorSize = 512;
}
return DosDevIOCtl32(buf, nsects * 512, &trk, sizeof(trk),
DSK_WRITETRACK, handle);
}
/* end of diskacc2.c */