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device_win32.c
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device_win32.c
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/* #includes */ /*{{{C}}}*//*{{{*/
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include "cpmdir.h"
#include "cpmfs.h"
#ifdef USE_DMALLOC
#include <dmalloc.h>
#endif
/*}}}*/
/* types */ /*{{{*/
#define PHYSICAL_SECTOR_1 1 /* First physical sector */
/* Use the INT13 interface rather than INT25/INT26. This appears to
* improve performance, but is less well tested. */
#define USE_INT13
/* Windows 95 disk I/O functions - based on Stan Mitchell's DISKDUMP.C */
#define VWIN32_DIOC_DOS_IOCTL 1 /* DOS ioctl calls 4400h-4411h */
#define VWIN32_DIOC_DOS_INT25 2 /* absolute disk read, DOS int 25h */
#define VWIN32_DIOC_DOS_INT26 3 /* absolute disk write, DOS int 26h */
#define VWIN32_DIOC_DOS_INT13 4 /* BIOS INT13 functions */
typedef struct _DIOC_REGISTERS {
DWORD reg_EBX;
DWORD reg_EDX;
DWORD reg_ECX;
DWORD reg_EAX;
DWORD reg_EDI;
DWORD reg_ESI;
DWORD reg_Flags;
}
DIOC_REGISTERS, *PDIOC_REGISTERS;
#define LEVEL0_LOCK 0
#define LEVEL1_LOCK 1
#define LEVEL2_LOCK 2
#define LEVEL3_LOCK 3
#define LEVEL1_LOCK_MAX_PERMISSION 0x0001
#define DRIVE_IS_REMOTE 0x1000
#define DRIVE_IS_SUBST 0x8000
/*********************************************************
**** Note: all MS-DOS data structures must be packed ****
**** on a one-byte boundary. ****
*********************************************************/
#pragma pack(1)
typedef struct _DISKIO {
DWORD diStartSector; /* sector number to start at */
WORD diSectors; /* number of sectors */
DWORD diBuffer; /* address of buffer */
}
DISKIO, *PDISKIO;
typedef struct MID {
WORD midInfoLevel; /* information level, must be 0 */
DWORD midSerialNum; /* serial number for the medium */
char midVolLabel[11]; /* volume label for the medium */
char midFileSysType[8]; /* type of file system as 8-byte ASCII */
}
MID, *PMID;
typedef struct driveparams { /* Disk geometry */
BYTE special;
BYTE devicetype;
WORD deviceattrs;
WORD cylinders;
BYTE mediatype;
/* BPB starts here */
WORD bytespersector;
BYTE sectorspercluster;
WORD reservedsectors;
BYTE numberofFATs;
WORD rootdirsize;
WORD totalsectors;
BYTE mediaid;
WORD sectorsperfat;
WORD sectorspertrack;
WORD heads;
DWORD hiddensectors;
DWORD bigtotalsectors;
BYTE reserved[6];
/* BPB ends here */
WORD sectorcount;
WORD sectortable[80];
} DRIVEPARAMS, *PDRIVEPARAMS;
/*}}}*/
static char *strwin32error(void) /*{{{*/
{
static char buffer[1024];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */
(LPTSTR)buffer,
1023, NULL);
return buffer;
}
/*}}}*/
static BOOL LockVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_LOCK_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static BOOL UnlockVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static BOOL DismountVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static int GetDriveParams( HANDLE hVWin32Device, int volume, DRIVEPARAMS* pParam ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0860; /* Get Device params */
reg.reg_EDX = (DWORD)pParam;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int SetDriveParams( HANDLE hVWin32Device, int volume, DRIVEPARAMS* pParam ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0840; /* Set Device params */
reg.reg_EDX = (DWORD)pParam;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int GetMediaID( HANDLE hVWin32Device, int volume, MID* pMid ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0866; /* Get Media ID */
reg.reg_EDX = (DWORD)pMid;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int VolumeCheck(HANDLE hVWin32Device, int volume, WORD* flags ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x4409; /* Is Drive Remote */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
*flags = (WORD)(reg.reg_EDX & 0xffff);
return 0;
}
/*}}}*/
static int LockLogicalVolume(HANDLE hVWin32Device, int volume, int lock_level, int permissions) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* generic IOCTL */
reg.reg_ECX = 0x084a; /* lock logical volume */
reg.reg_EBX = volume | (lock_level << 8);
reg.reg_EDX = permissions;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int UnlockLogicalVolume( HANDLE hVWin32Device, int volume ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d;
reg.reg_ECX = 0x086a; /* lock logical volume */
reg.reg_EBX = volume;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) ) return -1;
return 0;
}
/*}}}*/
static int w32mode(int mode) /*{{{*/
{
switch(mode)
{
case O_RDONLY: return GENERIC_READ;
case O_WRONLY: return GENERIC_WRITE;
}
return GENERIC_READ | GENERIC_WRITE;
}
/*}}}*/
/* Device_open -- Open an image file */ /*{{{*/
const char *Device_open(struct Device *sb, const char *filename, int mode, const char *deviceOpts)
{
/* Windows 95/NT: floppy drives using handles */
if (strlen(filename) == 2 && filename[1] == ':') /* Drive name */
{
char vname[20];
DWORD dwVers;
sb->fd = -1;
dwVers = GetVersion();
if (dwVers & 0x80000000L) /* Win32s (3.1) or Win32c (Win95) */
{
int lock, driveno, res, permissions;
unsigned short drive_flags;
MID media;
vname[0] = toupper(filename[0]);
driveno = vname[0] - 'A' + 1; /* 1=A: 2=B: */
sb->drvtype = CPMDRV_WIN95;
sb->hdisk = CreateFile( "\\\\.\\vwin32",
0,
0,
NULL,
0,
FILE_FLAG_DELETE_ON_CLOSE,
NULL );
if (!sb->hdisk)
{
return "Failed to open VWIN32 driver.";
}
if (VolumeCheck(sb->hdisk, driveno, &drive_flags))
{
CloseHandle(sb->hdisk);
return "Invalid drive";
}
res = GetMediaID( sb->hdisk, driveno, &media );
if ( res )
{
const char *lboo = NULL;
if ( res == ERROR_INVALID_FUNCTION &&
(drive_flags & DRIVE_IS_REMOTE ))
lboo = "Network drive";
else if (res == ERROR_ACCESS_DENIED) lboo = "Access denied";
/* nb: It's perfectly legitimate for GetMediaID() to fail; most CP/M */
/* CP/M disks won't have a media ID. */
if (lboo != NULL)
{
CloseHandle(sb->hdisk);
return lboo;
}
}
if (!res &&
(!memcmp( media.midFileSysType, "CDROM", 5 ) ||
!memcmp( media.midFileSysType, "CD001", 5 ) ||
!memcmp( media.midFileSysType, "CDAUDIO", 5 )))
{
CloseHandle(sb->hdisk);
return "CD-ROM drive";
}
if (w32mode(mode) & GENERIC_WRITE)
{
lock = LEVEL0_LOCK; /* Exclusive access */
permissions = 0;
}
else
{
lock = LEVEL1_LOCK; /* Allow other processes access */
permissions = LEVEL1_LOCK_MAX_PERMISSION;
}
if (LockLogicalVolume( sb->hdisk, driveno, lock, permissions))
{
CloseHandle(sb->hdisk);
return "Could not acquire a lock on the drive.";
}
sb->fd = driveno; /* 1=A: 2=B: etc - we will need this later */
}
else
{
sprintf(vname, "\\\\.\\%s", filename);
sb->drvtype = CPMDRV_WINNT;
sb->hdisk = CreateFile(vname, /* Name */
w32mode(mode), /* Access mode */
FILE_SHARE_READ|FILE_SHARE_WRITE, /*Sharing*/
NULL, /* Security attributes */
OPEN_EXISTING, /* See MSDN */
0, /* Flags & attributes */
NULL); /* Template file */
if (sb->hdisk != INVALID_HANDLE_VALUE)
{
sb->fd = 1; /* Arbitrary value >0 */
if (LockVolume(sb->hdisk) == FALSE) /* Lock drive */
{
char *lboo = strwin32error();
CloseHandle(sb->hdisk);
sb->fd = -1;
return lboo;
}
}
else return strwin32error();
}
sb->opened = 1;
return NULL;
}
/* Not a floppy. Treat it as a normal file */
mode |= O_BINARY;
sb->fd = open(filename, mode);
if (sb->fd == -1) return strerror(errno);
sb->drvtype = CPMDRV_FILE;
sb->opened = 1;
return NULL;
}
/*}}}*/
/* Device_setGeometry -- Set disk geometry */ /*{{{*/
const char * Device_setGeometry(struct Device *this, int secLength, int sectrk, int tracks, off_t offset, const char *libdskGeometry)
{
int n;
this->secLength=secLength;
this->sectrk=sectrk;
this->tracks=tracks;
// Bill Buckels - add this->offset
this->offset=offset;
// Bill Buckels - not sure what to do here
if (this->drvtype == CPMDRV_WIN95)
{
DRIVEPARAMS drvp;
memset(&drvp, 0, sizeof(drvp));
if (GetDriveParams( this->hdisk, this->fd, &drvp )) return "GetDriveParams failed";
drvp.bytespersector = secLength;
drvp.sectorspertrack = sectrk;
drvp.totalsectors = sectrk * tracks;
/* Guess the cylinder/head configuration from the track count. This will
* get single-sided 80-track discs wrong, but it's that or double-sided
* 40-track (or add cylinder/head counts to diskdefs)
*/
if (tracks < 44)
{
drvp.cylinders = tracks;
drvp.heads = 1;
}
else
{
drvp.cylinders = tracks / 2;
drvp.heads = 2;
}
/* Set up "reasonable" values for the other members */
drvp.sectorspercluster = 1024 / secLength;
drvp.reservedsectors = 1;
drvp.numberofFATs = 2;
drvp.sectorcount = sectrk;
drvp.rootdirsize = 64;
drvp.mediaid = 0xF0;
drvp.hiddensectors = 0;
drvp.sectorsperfat = 3;
for (n = 0; n < sectrk; n++)
{
drvp.sectortable[n*2] = n + PHYSICAL_SECTOR_1; /* Physical sector numbers */
drvp.sectortable[n*2+1] = secLength;
}
drvp.special = 6;
/* We have not set:
drvp.mediatype
drvp.devicetype
drvp.deviceattrs
which should have been read correctly by GetDriveParams().
*/
SetDriveParams( this->hdisk, this->fd, &drvp );
}
return NULL;
}
/*}}}*/
/* Device_close -- Close an image file */ /*{{{*/
const char *Device_close(struct Device *sb)
{
sb->opened = 0;
switch(sb->drvtype)
{
case CPMDRV_WIN95:
UnlockLogicalVolume(sb->hdisk, sb->fd );
if (!CloseHandle( sb->hdisk )) return strwin32error();
return NULL;
case CPMDRV_WINNT:
DismountVolume(sb->hdisk);
UnlockVolume(sb->hdisk);
if (!CloseHandle(sb->hdisk)) return strwin32error();
return NULL;
}
if (close(sb->fd)) return strerror(errno);
return NULL;
}
/*}}}*/
/* Device_readSector -- read a physical sector */ /*{{{*/
const char *Device_readSector(const struct Device *drive, int track, int sector, char *buf)
{
int res;
off_t offset;
assert(sector>=0);
assert(sector<drive->sectrk);
assert(track>=0);
assert(track<drive->tracks);
offset = ((sector+track*drive->sectrk)*drive->secLength);
if (drive->drvtype == CPMDRV_WINNT)
{
LPVOID iobuffer;
DWORD bytesread;
// Bill Buckels - add drive->offset
if (SetFilePointer(drive->hdisk, offset+drive->offset, NULL, FILE_BEGIN) == INVALID_FILE_SIZE)
{
return strwin32error();
}
iobuffer = VirtualAlloc(NULL, drive->secLength, MEM_COMMIT, PAGE_READWRITE);
if (!iobuffer)
{
return strwin32error();
}
res = ReadFile(drive->hdisk, iobuffer, drive->secLength, &bytesread, NULL);
if (!res)
{
char *lboo = strwin32error();
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return lboo;
}
memcpy(buf, iobuffer, drive->secLength);
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
if (bytesread < (unsigned)drive->secLength)
{
memset(buf + bytesread, 0, drive->secLength - bytesread);
}
return NULL;
}
// Bill Buckels - not sure what to do here
if (drive->drvtype == CPMDRV_WIN95)
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
#ifdef USE_INT13
int cyl, head;
if (drive->tracks < 44) { cyl = track; head = 0; }
else { cyl = track/2; head = track & 1; }
reg.reg_EAX = 0x0201; /* Read 1 sector */
reg.reg_EBX = (DWORD)buf;
reg.reg_ECX = (cyl << 8) | (sector + PHYSICAL_SECTOR_1);
reg.reg_EDX = (head << 8) | (drive->fd - 1);
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT13,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#else
DISKIO di;
reg.reg_EAX = drive->fd - 1; /* zero-based volume number */
reg.reg_EBX = (DWORD)&di;
reg.reg_ECX = 0xffff; /* use DISKIO structure */
reg.reg_Flags = 1; /* preset the carry flag */
di.diStartSector = sector+track*drive->sectrk;
di.diSectors = 1;
di.diBuffer = (DWORD)buf;
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT25,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#endif
if ( !bResult || (reg.reg_Flags & 1) )
{
if (GetLastError()) return strwin32error();
return "Unknown read error.";
}
return 0;
}
// Bill Buckels - add drive->offset
if (lseek(drive->fd,offset+drive->offset,SEEK_SET)==-1)
{
return strerror(errno);
}
if ((res=read(drive->fd, buf, drive->secLength)) != drive->secLength)
{
if (res==-1)
{
return strerror(errno);
}
else memset(buf+res,0,drive->secLength-res); /* hit end of disk image */
}
return NULL;
}
/*}}}*/
/* Device_writeSector -- write physical sector */ /*{{{*/
const char *Device_writeSector(const struct Device *drive, int track, int sector, const char *buf)
{
off_t offset;
int res;
assert(sector>=0);
assert(sector<drive->sectrk);
assert(track>=0);
assert(track<drive->tracks);
offset = ((sector+track*drive->sectrk)*drive->secLength);
if (drive->drvtype == CPMDRV_WINNT)
{
LPVOID iobuffer;
DWORD byteswritten;
// Bill Buckels - add drive->offset
if (SetFilePointer(drive->hdisk, offset+drive->offset, NULL, FILE_BEGIN) == INVALID_FILE_SIZE)
{
return strwin32error();
}
iobuffer = VirtualAlloc(NULL, drive->secLength, MEM_COMMIT, PAGE_READWRITE);
if (!iobuffer)
{
return strwin32error();
}
memcpy(iobuffer, buf, drive->secLength);
res = WriteFile(drive->hdisk, iobuffer, drive->secLength, &byteswritten, NULL);
if (!res || (byteswritten < (unsigned)drive->secLength))
{
char *lboo = strwin32error();
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return lboo;
}
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return NULL;
}
// Bill Buckels - not sure what to do here
if (drive->drvtype == CPMDRV_WIN95)
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
#ifdef USE_INT13
int cyl, head;
if (drive->tracks < 44) { cyl = track; head = 0; }
else { cyl = track/2; head = track & 1; }
reg.reg_EAX = 0x0301; /* Write 1 sector */
reg.reg_EBX = (DWORD)buf;
reg.reg_ECX = (cyl << 8) | (sector + PHYSICAL_SECTOR_1);
reg.reg_EDX = (head << 8) | (drive->fd - 1);
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT13,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#else
DISKIO di;
reg.reg_EAX = drive->fd - 1; /* zero-based volume number */
reg.reg_EBX = (DWORD)&di;
reg.reg_ECX = 0xffff; /* use DISKIO structure */
reg.reg_Flags = 1; /* preset the carry flag */
di.diStartSector = sector+track*drive->sectrk;
di.diSectors = 1;
di.diBuffer = (DWORD)buf;
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT26,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#endif
if ( !bResult || (reg.reg_Flags & 1) )
{
if (GetLastError()) return strwin32error();
return "Unknown write error.";
}
return NULL;
}
// Bill Buckels - add drive->offset
if (lseek(drive->fd,offset+drive->offset, SEEK_SET)==-1)
{
return strerror(errno);
}
if (write(drive->fd, buf, drive->secLength) == drive->secLength) return NULL;
return strerror(errno);
}
/*}}}*/