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AppleWin/source/Disk.cpp

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/*
AppleWin : An Apple //e emulator for Windows
Copyright (C) 1994-1996, Michael O'Brien
Copyright (C) 1999-2001, Oliver Schmidt
Copyright (C) 2002-2005, Tom Charlesworth
Copyright (C) 2006-2007, Tom Charlesworth, Michael Pohoreski
AppleWin 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 of the License, or
(at your option) any later version.
AppleWin 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 AppleWin; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Description: Disk
*
* Author: Various
*/
#include "StdAfx.h"
#pragma hdrstop
#define LOG_DISK_ENABLED 1
#ifndef _VC71
#if LOG_DISK_ENABLED
// __VA_ARGS__ not supported on MSVC++ .NET 7.x
#define LOG_DISK(format, params) LOG(format, params)
#else
#define LOG_DISK(format, params)
#endif
#endif
// Public _________________________________________________________________________________________
BOOL enhancedisk = 1;
// Private ________________________________________________________________________________________
const int MAX_DISK_IMAGE_NAME = 15;
const int MAX_DISK_FULL_NAME = 127;
struct Disk_t
{
TCHAR imagename[ MAX_DISK_IMAGE_NAME + 1 ];
TCHAR fullname [ MAX_DISK_FULL_NAME + 1 ];
HIMAGE imagehandle;
int track;
LPBYTE trackimage;
int phase;
int byte;
BOOL writeprotected;
BOOL trackimagedata;
BOOL trackimagedirty;
DWORD spinning;
DWORD writelight;
int nibbles;
};
static WORD currdrive = 0;
static BOOL diskaccessed = 0;
static Disk_t g_aFloppyDisk[DRIVES];
static BYTE floppylatch = 0;
static BOOL floppymotoron = 0;
static BOOL floppywritemode = 0;
static WORD phases; // state bits for stepper magnet phases 0 - 3
static void CheckSpinning();
static Disk_Status_e GetDriveLightStatus( const int iDrive );
static bool IsDriveValid( const int iDrive );
static void ReadTrack (int drive);
static void RemoveDisk (int drive);
static void WriteTrack (int drive);
//===========================================================================
void CheckSpinning () {
DWORD modechange = (floppymotoron && !g_aFloppyDisk[currdrive].spinning);
if (floppymotoron)
g_aFloppyDisk[currdrive].spinning = 20000;
if (modechange)
FrameRefreshStatus(DRAW_LEDS);
}
//===========================================================================
Disk_Status_e GetDriveLightStatus( const int iDrive )
{
if (IsDriveValid( iDrive ))
{
Disk_t *pFloppy = & g_aFloppyDisk[ iDrive ];
if (pFloppy->spinning)
{
if (pFloppy->writeprotected)
return DISK_STATUS_PROT;
if (pFloppy->writelight)
return DISK_STATUS_WRITE;
else
return DISK_STATUS_READ;
}
else
return DISK_STATUS_OFF;
}
return DISK_STATUS_OFF;
}
//===========================================================================
void GetImageTitle (LPCTSTR imagefilename, Disk_t * fptr)
{
TCHAR imagetitle[ MAX_DISK_FULL_NAME+1 ];
LPCTSTR startpos = imagefilename;
// imagetitle = <FILENAME.EXT>
if (_tcsrchr(startpos,TEXT('\\')))
startpos = _tcsrchr(startpos,TEXT('\\'))+1;
_tcsncpy(imagetitle,startpos,MAX_DISK_FULL_NAME);
imagetitle[MAX_DISK_FULL_NAME] = 0;
// if imagetitle contains a lowercase char, then found=1 (why?)
BOOL found = 0;
int loop = 0;
while (imagetitle[loop] && !found)
{
if (IsCharLower(imagetitle[loop]))
found = 1;
else
loop++;
}
if ((!found) && (loop > 2))
CharLowerBuff(imagetitle+1,_tcslen(imagetitle+1));
// fptr->fullname = <FILENAME.EXT>
_tcsncpy( fptr->fullname, imagetitle, MAX_DISK_FULL_NAME );
fptr->fullname[ MAX_DISK_FULL_NAME ] = 0;
if (imagetitle[0])
{
LPTSTR dot = imagetitle;
if (_tcsrchr(dot,TEXT('.')))
dot = _tcsrchr(dot,TEXT('.'));
if (dot > imagetitle)
*dot = 0;
}
// fptr->imagename = <FILENAME> (ie. no extension)
_tcsncpy( fptr->imagename, imagetitle, MAX_DISK_IMAGE_NAME );
fptr->imagename[ MAX_DISK_IMAGE_NAME ] = 0;
}
//===========================================================================
bool IsDriveValid( const int iDrive )
{
if (iDrive < 0)
return false;
if (iDrive >= DRIVES)
return false;
return true;
}
//===========================================================================
static void AllocTrack(int drive)
{
Disk_t * fptr = &g_aFloppyDisk[drive];
fptr->trackimage = (LPBYTE)VirtualAlloc(NULL,NIBBLES_PER_TRACK,MEM_COMMIT,PAGE_READWRITE);
}
//===========================================================================
static void ReadTrack (int iDrive)
{
if (! IsDriveValid( iDrive ))
return;
Disk_t *pFloppy = &g_aFloppyDisk[ iDrive ];
if (pFloppy->track >= TRACKS)
{
pFloppy->trackimagedata = 0;
return;
}
if (! pFloppy->trackimage)
AllocTrack( iDrive );
if (pFloppy->trackimage && pFloppy->imagehandle)
{
#ifndef _VC71
LOG_DISK("read track %2X%s\r", pFloppy->track, (pFloppy->phase & 1) ? ".5" : "");
#endif
ImageReadTrack(
pFloppy->imagehandle,
pFloppy->track,
pFloppy->phase,
pFloppy->trackimage,
&pFloppy->nibbles);
pFloppy->byte = 0;
pFloppy->trackimagedata = (pFloppy->nibbles != 0);
}
}
//===========================================================================
static void RemoveDisk (int iDrive)
{
Disk_t *pFloppy = &g_aFloppyDisk[iDrive];
if (pFloppy->imagehandle)
{
if (pFloppy->trackimage && pFloppy->trackimagedirty)
WriteTrack( iDrive);
ImageClose(pFloppy->imagehandle);
pFloppy->imagehandle = (HIMAGE)0;
}
if (pFloppy->trackimage)
{
VirtualFree(pFloppy->trackimage,0,MEM_RELEASE);
pFloppy->trackimage = NULL;
pFloppy->trackimagedata = 0;
}
memset( pFloppy->imagename, 0, MAX_DISK_IMAGE_NAME+1 );
memset( pFloppy->fullname , 0, MAX_DISK_FULL_NAME +1 );
}
//===========================================================================
static void WriteTrack (int iDrive)
{
Disk_t *pFloppy = &g_aFloppyDisk[ iDrive ];
if (pFloppy->track >= TRACKS)
return;
if (pFloppy->writeprotected)
return;
if (pFloppy->trackimage && pFloppy->imagehandle)
ImageWriteTrack(
pFloppy->imagehandle,
pFloppy->track,
pFloppy->phase,
pFloppy->trackimage,
pFloppy->nibbles );
pFloppy->trackimagedirty = 0;
}
//
// ----- ALL GLOBALLY ACCESSIBLE FUNCTIONS ARE BELOW THIS LINE -----
//
//===========================================================================
void DiskBoot () {
// THIS FUNCTION RELOADS A PROGRAM IMAGE IF ONE IS LOADED IN DRIVE ONE.
// IF A DISK IMAGE OR NO IMAGE IS LOADED IN DRIVE ONE, IT DOES NOTHING.
if (g_aFloppyDisk[0].imagehandle && ImageBoot(g_aFloppyDisk[0].imagehandle))
floppymotoron = 0;
}
//===========================================================================
BYTE __stdcall DiskControlMotor (WORD, BYTE address, BYTE, BYTE, ULONG) {
floppymotoron = address & 1;
CheckSpinning();
return MemReturnRandomData(1);
}
//===========================================================================
BYTE __stdcall DiskControlStepper (WORD, BYTE address, BYTE, BYTE, ULONG)
{
Disk_t * fptr = &g_aFloppyDisk[currdrive];
int phase = (address >> 1) & 3;
int phase_bit = (1 << phase);
// update the magnet states
if (address & 1)
{
// phase on
phases |= phase_bit;
#ifndef _VC71
LOG_DISK("track %02X phases %X phase %d on address $C0E%X\r", fptr->phase, phases, phase, address & 0xF);
#endif
}
else
{
// phase off
phases &= ~phase_bit;
#ifndef _VC71
LOG_DISK("track %02X phases %X phase %d off address $C0E%X\r", fptr->phase, phases, phase, address & 0xF);
#endif
}
// check for any stepping effect from a magnet
// - move only when the magnet opposite the cog is off
// - move in the direction of an adjacent magnet if one is on
// - do not move if both adjacent magnets are on
// momentum and timing are not accounted for ... maybe one day!
int direction = 0;
if ((phases & (1 << fptr->phase)) == 0)
{
if (phases & (1 << ((fptr->phase + 1) & 3)))
direction += 1;
if (phases & (1 << ((fptr->phase + 3) & 3)))
direction -= 1;
}
// apply magnet step, if any
if (direction)
{
fptr->phase = MAX(0, MIN(79, fptr->phase + direction));
int newtrack = MIN(TRACKS-1, fptr->phase >> 1); // (round half tracks down)
#ifndef _VC71
LOG_DISK("newtrack %2X%s\r", newtrack, (fptr->phase & 1) ? ".5" : "");
#endif
if (newtrack != fptr->track)
{
if (fptr->trackimage && fptr->trackimagedirty)
{
WriteTrack(currdrive);
}
fptr->track = newtrack;
fptr->trackimagedata = 0;
}
}
return (address == 0xE0) ? 0xFF : MemReturnRandomData(1);
}
//===========================================================================
void DiskDestroy ()
{
RemoveDisk(0);
RemoveDisk(1);
}
//===========================================================================
BYTE __stdcall DiskEnable (WORD, BYTE address, BYTE, BYTE, ULONG) {
currdrive = address & 1;
g_aFloppyDisk[!currdrive].spinning = 0;
g_aFloppyDisk[!currdrive].writelight = 0;
CheckSpinning();
return 0;
}
//===========================================================================
void DiskEject( const int iDrive )
{
if (IsDriveValid( iDrive ))
{
RemoveDisk( iDrive );
}
}
//===========================================================================
LPCTSTR DiskGetFullName (int drive) {
return g_aFloppyDisk[drive].fullname;
}
//===========================================================================
void DiskGetLightStatus (int *pDisk1Status_, int *pDisk2Status_)
{
// *drive1 = g_aFloppyDisk[0].spinning ? g_aFloppyDisk[0].writelight ? 2 : 1 : 0;
// *drive2 = g_aFloppyDisk[1].spinning ? g_aFloppyDisk[1].writelight ? 2 : 1 : 0;
if (pDisk1Status_)
*pDisk1Status_ = GetDriveLightStatus( 0 );
if (pDisk2Status_)
*pDisk2Status_ = GetDriveLightStatus( 1 );
}
//===========================================================================
LPCTSTR DiskGetName (int drive) {
return g_aFloppyDisk[drive].imagename;
}
//===========================================================================
void DiskInitialize () {
int loop = DRIVES;
while (loop--)
ZeroMemory(&g_aFloppyDisk[loop],sizeof(Disk_t ));
TCHAR imagefilename[MAX_PATH];
_tcscpy(imagefilename,g_sProgramDir);
_tcscat(imagefilename,TEXT("MASTER.DSK")); // TODO: Should remember last disk by user
DiskInsert(0,imagefilename,0,0);
}
//===========================================================================
int DiskInsert (int drive, LPCTSTR imagefilename, BOOL writeprotected, BOOL createifnecessary) {
Disk_t * fptr = &g_aFloppyDisk[drive];
if (fptr->imagehandle)
RemoveDisk(drive);
ZeroMemory(fptr,sizeof(Disk_t ));
fptr->writeprotected = writeprotected;
int error = ImageOpen(imagefilename,
&fptr->imagehandle,
&fptr->writeprotected,
createifnecessary);
if (error == IMAGE_ERROR_NONE)
GetImageTitle(imagefilename,fptr);
return error;
}
//===========================================================================
BOOL DiskIsSpinning ()
{
return floppymotoron;
}
//===========================================================================
void DiskNotifyInvalidImage (LPCTSTR imagefilename,int error)
{
TCHAR buffer[MAX_PATH+128];
switch (error)
{
case 1:
wsprintf(
buffer,
TEXT("Unable to open the file %s."),
(LPCTSTR)imagefilename);
break;
case 2:
wsprintf(
buffer,
TEXT("Unable to use the file %s\nbecause the ")
TEXT("disk image format is not recognized."),
(LPCTSTR)imagefilename);
break;
default:
// IGNORE OTHER ERRORS SILENTLY
return;
}
MessageBox(
g_hFrameWindow,
buffer,
g_pAppTitle,
MB_ICONEXCLAMATION | MB_SETFOREGROUND);
}
//===========================================================================
bool DiskGetProtect( const int iDrive )
{
if (IsDriveValid( iDrive ))
{
Disk_t *pFloppy = &g_aFloppyDisk[ iDrive ];
if (pFloppy->writeprotected)
return true;
}
return false;
}
//===========================================================================
void DiskSetProtect( const int iDrive, const bool bWriteProtect )
{
if (IsDriveValid( iDrive ))
{
Disk_t *pFloppy = &g_aFloppyDisk[ iDrive ];
pFloppy->writeprotected = bWriteProtect;
}
}
//===========================================================================
BYTE __stdcall DiskReadWrite (WORD programcounter, BYTE, BYTE, BYTE, ULONG) {
Disk_t * fptr = &g_aFloppyDisk[currdrive];
diskaccessed = 1;
if ((!fptr->trackimagedata) && fptr->imagehandle)
ReadTrack(currdrive);
if (!fptr->trackimagedata)
return 0xFF;
BYTE result = 0;
if ((!floppywritemode) || (!fptr->writeprotected))
if (floppywritemode)
if (floppylatch & 0x80) {
*(fptr->trackimage+fptr->byte) = floppylatch;
fptr->trackimagedirty = 1;
}
else
return 0;
else
result = *(fptr->trackimage+fptr->byte);
#if LOG_DISK_ENABLED
if (0)
{
#ifndef _VC71
LOG_DISK("nib %4X = %2X\r", fptr->byte, result);
#endif
}
#endif
if (++fptr->byte >= fptr->nibbles)
fptr->byte = 0;
return result;
}
//===========================================================================
void DiskReset () {
floppymotoron = 0;
phases = 0;
}
//===========================================================================
void DiskSelectImage (int drive, LPSTR pszFilename)
{
TCHAR directory[MAX_PATH] = TEXT("");
TCHAR filename[MAX_PATH];
TCHAR title[40];
strcpy(filename, pszFilename);
RegLoadString(TEXT("Preferences"),REGVALUE_PREF_START_DIR,1,directory,MAX_PATH);
_tcscpy(title,TEXT("Select Disk Image For Drive "));
_tcscat(title,drive ? TEXT("2") : TEXT("1"));
OPENFILENAME ofn;
ZeroMemory(&ofn,sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = g_hFrameWindow;
ofn.hInstance = g_hInstance;
ofn.lpstrFilter = TEXT("All Images\0*.apl;*.bin;*.do;*.dsk;*.iie;*.nib;*.po\0")
TEXT("Disk Images (*.bin,*.do,*.dsk,*.iie,*.nib,*.po)\0*.bin;*.do;*.dsk;*.iie;*.nib;*.po\0")
TEXT("All Files\0*.*\0");
ofn.lpstrFile = filename;
ofn.nMaxFile = MAX_PATH;
ofn.lpstrInitialDir = directory;
ofn.Flags = OFN_PATHMUSTEXIST;
ofn.lpstrTitle = title;
if (GetOpenFileName(&ofn))
{
if ((!ofn.nFileExtension) || !filename[ofn.nFileExtension])
_tcscat(filename,TEXT(".DSK"));
int error = DiskInsert(drive,filename,ofn.Flags & OFN_READONLY,1);
if (!error)
{
filename[ofn.nFileOffset] = 0;
if (_tcsicmp(directory,filename))
RegSaveString(TEXT("Preferences"),REGVALUE_PREF_START_DIR,1,filename);
}
else
{
DiskNotifyInvalidImage(filename,error);
}
}
}
//===========================================================================
void DiskSelect (int drive)
{
DiskSelectImage(drive, TEXT(""));
}
//===========================================================================
BYTE __stdcall DiskSetLatchValue (WORD, BYTE, BYTE write, BYTE value, ULONG) {
if (write)
floppylatch = value;
return floppylatch;
}
//===========================================================================
BYTE __stdcall DiskSetReadMode (WORD, BYTE, BYTE, BYTE, ULONG) {
floppywritemode = 0;
return MemReturnRandomData(g_aFloppyDisk[currdrive].writeprotected);
}
//===========================================================================
BYTE __stdcall DiskSetWriteMode (WORD, BYTE, BYTE, BYTE, ULONG) {
floppywritemode = 1;
BOOL modechange = !g_aFloppyDisk[currdrive].writelight;
g_aFloppyDisk[currdrive].writelight = 20000;
if (modechange)
FrameRefreshStatus(DRAW_LEDS);
return MemReturnRandomData(1);
}
//===========================================================================
void DiskUpdatePosition (DWORD cycles) {
int loop = 2;
while (loop--) {
Disk_t * fptr = &g_aFloppyDisk[loop];
if (fptr->spinning && !floppymotoron) {
if (!(fptr->spinning -= MIN(fptr->spinning,(cycles >> 6))))
FrameRefreshStatus(DRAW_LEDS);
}
if (floppywritemode && (currdrive == loop) && fptr->spinning)
fptr->writelight = 20000;
else if (fptr->writelight) {
if (!(fptr->writelight -= MIN(fptr->writelight,(cycles >> 6))))
FrameRefreshStatus(DRAW_LEDS);
}
if ((!enhancedisk) && (!diskaccessed) && fptr->spinning) {
needsprecision = cumulativecycles;
fptr->byte += (cycles >> 5);
if (fptr->byte >= fptr->nibbles)
fptr->byte -= fptr->nibbles;
}
}
diskaccessed = 0;
}
//===========================================================================
bool DiskDriveSwap()
{
// Refuse to swap if either Disk][ is active
if(g_aFloppyDisk[0].spinning || g_aFloppyDisk[1].spinning)
return false;
// Swap disks between drives
Disk_t temp;
// Swap trackimage ptrs (so don't need to swap the buffers' data)
// TODO: Array of Pointers: Disk_t* g_aDrive[]
memcpy(&temp , &g_aFloppyDisk[0], sizeof(Disk_t ));
memcpy(&g_aFloppyDisk[0], &g_aFloppyDisk[1], sizeof(Disk_t ));
memcpy(&g_aFloppyDisk[1], &temp , sizeof(Disk_t ));
FrameRefreshStatus(DRAW_LEDS | DRAW_BUTTON_DRIVES);
return true;
}
//===========================================================================
DWORD DiskGetSnapshot(SS_CARD_DISK2* pSS, DWORD dwSlot)
{
pSS->Hdr.UnitHdr.dwLength = sizeof(SS_CARD_DISK2);
pSS->Hdr.UnitHdr.dwVersion = MAKE_VERSION(1,0,0,2);
pSS->Hdr.dwSlot = dwSlot;
pSS->Hdr.dwType = CT_Disk2;
pSS->phases = phases; // new in 1.0.0.2 disk snapshots
pSS->currdrive = currdrive; // this was an int in 1.0.0.1 disk snapshots
pSS->diskaccessed = diskaccessed;
pSS->enhancedisk = enhancedisk;
pSS->floppylatch = floppylatch;
pSS->floppymotoron = floppymotoron;
pSS->floppywritemode = floppywritemode;
for(UINT i=0; i<2; i++)
{
strcpy(pSS->Unit[i].szFileName, g_aFloppyDisk[i].fullname);
pSS->Unit[i].track = g_aFloppyDisk[i].track;
pSS->Unit[i].phase = g_aFloppyDisk[i].phase;
pSS->Unit[i].byte = g_aFloppyDisk[i].byte;
pSS->Unit[i].writeprotected = g_aFloppyDisk[i].writeprotected;
pSS->Unit[i].trackimagedata = g_aFloppyDisk[i].trackimagedata;
pSS->Unit[i].trackimagedirty = g_aFloppyDisk[i].trackimagedirty;
pSS->Unit[i].spinning = g_aFloppyDisk[i].spinning;
pSS->Unit[i].writelight = g_aFloppyDisk[i].writelight;
pSS->Unit[i].nibbles = g_aFloppyDisk[i].nibbles;
if(g_aFloppyDisk[i].trackimage)
memcpy(pSS->Unit[i].nTrack, g_aFloppyDisk[i].trackimage, NIBBLES_PER_TRACK);
else
memset(pSS->Unit[i].nTrack, 0, NIBBLES_PER_TRACK);
}
return 0;
}
DWORD DiskSetSnapshot(SS_CARD_DISK2* pSS, DWORD /*dwSlot*/)
{
if(pSS->Hdr.UnitHdr.dwVersion > MAKE_VERSION(1,0,0,2))
{
return -1;
}
phases = pSS->phases; // new in 1.0.0.2 disk snapshots
currdrive = pSS->currdrive; // this was an int in 1.0.0.1 disk snapshots
diskaccessed = pSS->diskaccessed;
enhancedisk = pSS->enhancedisk;
floppylatch = pSS->floppylatch;
floppymotoron = pSS->floppymotoron;
floppywritemode = pSS->floppywritemode;
for(UINT i=0; i<2; i++)
{
bool bImageError = false;
ZeroMemory(&g_aFloppyDisk[i], sizeof(Disk_t ));
if(pSS->Unit[i].szFileName[0] == 0x00)
continue;
//
DWORD dwAttributes = GetFileAttributes(pSS->Unit[i].szFileName);
if(dwAttributes == INVALID_FILE_ATTRIBUTES)
{
// Get user to browse for file
DiskSelectImage(i, pSS->Unit[i].szFileName);
dwAttributes = GetFileAttributes(pSS->Unit[i].szFileName);
}
if(dwAttributes != INVALID_FILE_ATTRIBUTES)
{
BOOL bWriteProtected = (dwAttributes & FILE_ATTRIBUTE_READONLY) ? TRUE : FALSE;
if(DiskInsert(i, pSS->Unit[i].szFileName, bWriteProtected, 0))
bImageError = true;
// DiskInsert() sets up:
// . fullname
// . imagename
// . writeprotected
}
//
// strcpy(g_aFloppyDisk[i].fullname, pSS->Unit[i].szFileName);
g_aFloppyDisk[i].track = pSS->Unit[i].track;
g_aFloppyDisk[i].phase = pSS->Unit[i].phase;
g_aFloppyDisk[i].byte = pSS->Unit[i].byte;
// g_aFloppyDisk[i].writeprotected = pSS->Unit[i].writeprotected;
g_aFloppyDisk[i].trackimagedata = pSS->Unit[i].trackimagedata;
g_aFloppyDisk[i].trackimagedirty = pSS->Unit[i].trackimagedirty;
g_aFloppyDisk[i].spinning = pSS->Unit[i].spinning;
g_aFloppyDisk[i].writelight = pSS->Unit[i].writelight;
g_aFloppyDisk[i].nibbles = pSS->Unit[i].nibbles;
//
if(!bImageError)
{
if((g_aFloppyDisk[i].trackimage == NULL) && g_aFloppyDisk[i].nibbles)
AllocTrack(i);
if(g_aFloppyDisk[i].trackimage == NULL)
bImageError = true;
else
memcpy(g_aFloppyDisk[i].trackimage, pSS->Unit[i].nTrack, NIBBLES_PER_TRACK);
}
if(bImageError)
{
g_aFloppyDisk[i].trackimagedata = 0;
g_aFloppyDisk[i].trackimagedirty = 0;
g_aFloppyDisk[i].nibbles = 0;
}
}
FrameRefreshStatus(DRAW_LEDS | DRAW_BUTTON_DRIVES);
return 0;
}
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