AppleWin/source/SaveState.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
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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: Save-state (snapshot) module
*
* Author: Copyright (c) 2004-2006 Tom Charlesworth
*/
#include "StdAfx.h"
#pragma hdrstop
#define DEFAULT_SNAPSHOT_NAME "SaveState.aws"
bool g_bSaveStateOnExit = false;
static char g_szSaveStateFilename[MAX_PATH] = {0};
//-----------------------------------------------------------------------------
char* Snapshot_GetFilename()
{
return g_szSaveStateFilename;
}
void Snapshot_SetFilename(char* pszFilename)
{
if(*pszFilename)
strcpy(g_szSaveStateFilename, (const char *) pszFilename);
else
strcpy(g_szSaveStateFilename, DEFAULT_SNAPSHOT_NAME);
}
//-----------------------------------------------------------------------------
void Snapshot_LoadState()
{
char szMessage[32 + MAX_PATH];
APPLEWIN_SNAPSHOT* pSS = (APPLEWIN_SNAPSHOT*) new char[sizeof(APPLEWIN_SNAPSHOT)];
try
{
if(pSS == NULL)
throw(0);
memset(pSS, 0, sizeof(APPLEWIN_SNAPSHOT));
//
HANDLE hFile = CreateFile( g_szSaveStateFilename,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if(hFile == INVALID_HANDLE_VALUE)
{
strcpy(szMessage, "File not found: ");
strcpy(szMessage + strlen(szMessage), g_szSaveStateFilename);
throw(0);
}
DWORD dwBytesRead;
BOOL bRes = ReadFile( hFile,
pSS,
sizeof(APPLEWIN_SNAPSHOT),
&dwBytesRead,
NULL);
CloseHandle(hFile);
if(!bRes || (dwBytesRead != sizeof(APPLEWIN_SNAPSHOT)))
{
// File size wrong: probably because of version mismatch or corrupt file
strcpy(szMessage, "File size mismatch");
throw(0);
}
if(pSS->Hdr.dwTag != AW_SS_TAG)
{
strcpy(szMessage, "File corrupt");
throw(0);
}
if(pSS->Hdr.dwVersion != MAKE_VERSION(1,0,0,1))
{
strcpy(szMessage, "Version mismatch");
throw(0);
}
// TO DO: Verify checksum
//
// Reset all sub-systems
MemReset();
if (!IS_APPLE2)
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MemResetPaging();
DiskReset();
KeybReset();
VideoResetState();
MB_Reset();
//
// Apple2 uint
//
CpuSetSnapshot(&pSS->Apple2Unit.CPU6502);
sg_SSC.CommSetSnapshot(&pSS->Apple2Unit.Comms);
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JoySetSnapshot(&pSS->Apple2Unit.Joystick);
KeybSetSnapshot(&pSS->Apple2Unit.Keyboard);
SpkrSetSnapshot(&pSS->Apple2Unit.Speaker);
VideoSetSnapshot(&pSS->Apple2Unit.Video);
MemSetSnapshot(&pSS->Apple2Unit.Memory);
//
//
// Slot4: Mockingboard
MB_SetSnapshot(&pSS->Mockingboard1, 4);
//
// Slot5: Mockingboard
MB_SetSnapshot(&pSS->Mockingboard2, 5);
//
// Slot6: Disk][
DiskSetSnapshot(&pSS->Disk2, 6);
}
catch(int)
{
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MessageBox( g_hFrameWindow,
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szMessage,
TEXT("Load State"),
MB_ICONEXCLAMATION | MB_SETFOREGROUND);
}
delete [] pSS;
}
//-----------------------------------------------------------------------------
void Snapshot_SaveState()
{
APPLEWIN_SNAPSHOT* pSS = (APPLEWIN_SNAPSHOT*) new char[sizeof(APPLEWIN_SNAPSHOT)];
if(pSS == NULL)
{
// To do
return;
}
memset(pSS, 0, sizeof(APPLEWIN_SNAPSHOT));
pSS->Hdr.dwTag = AW_SS_TAG;
pSS->Hdr.dwVersion = MAKE_VERSION(1,0,0,1);
pSS->Hdr.dwChecksum = 0; // TO DO
//
// Apple2 uint
//
pSS->Apple2Unit.UnitHdr.dwLength = sizeof(SS_APPLE2_Unit);
pSS->Apple2Unit.UnitHdr.dwVersion = MAKE_VERSION(1,0,0,0);
CpuGetSnapshot(&pSS->Apple2Unit.CPU6502);
sg_SSC.CommGetSnapshot(&pSS->Apple2Unit.Comms);
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JoyGetSnapshot(&pSS->Apple2Unit.Joystick);
KeybGetSnapshot(&pSS->Apple2Unit.Keyboard);
SpkrGetSnapshot(&pSS->Apple2Unit.Speaker);
VideoGetSnapshot(&pSS->Apple2Unit.Video);
MemGetSnapshot(&pSS->Apple2Unit.Memory);
//
// Slot1: Empty
pSS->Empty1.Hdr.UnitHdr.dwLength = sizeof(SS_CARD_EMPTY);
pSS->Empty1.Hdr.UnitHdr.dwVersion = MAKE_VERSION(1,0,0,0);
pSS->Empty1.Hdr.dwSlot = 1;
pSS->Empty1.Hdr.dwType = CT_Empty;
//
// Slot2: Empty
pSS->Empty2.Hdr.UnitHdr.dwLength = sizeof(SS_CARD_EMPTY);
pSS->Empty2.Hdr.UnitHdr.dwVersion = MAKE_VERSION(1,0,0,0);
pSS->Empty2.Hdr.dwSlot = 2;
pSS->Empty2.Hdr.dwType = CT_Empty;
//
// Slot3: Empty
pSS->Empty3.Hdr.UnitHdr.dwLength = sizeof(SS_CARD_EMPTY);
pSS->Empty3.Hdr.UnitHdr.dwVersion = MAKE_VERSION(1,0,0,0);
pSS->Empty3.Hdr.dwSlot = 3;
pSS->Empty3.Hdr.dwType = CT_Empty;
//
// Slot4: Mockingboard
MB_GetSnapshot(&pSS->Mockingboard1, 4);
//
// Slot5: Mockingboard
MB_GetSnapshot(&pSS->Mockingboard2, 5);
//
// Slot6: Disk][
DiskGetSnapshot(&pSS->Disk2, 6);
//
HANDLE hFile = CreateFile( g_szSaveStateFilename,
GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
DWORD dwError = GetLastError();
_ASSERT((dwError == 0) || (dwError == ERROR_ALREADY_EXISTS));
if(hFile != INVALID_HANDLE_VALUE)
{
DWORD dwBytesWritten;
BOOL bRes = WriteFile( hFile,
pSS,
sizeof(APPLEWIN_SNAPSHOT),
&dwBytesWritten,
NULL);
if(!bRes || (dwBytesWritten != sizeof(APPLEWIN_SNAPSHOT)))
dwError = GetLastError();
CloseHandle(hFile);
}
else
{
dwError = GetLastError();
}
_ASSERT((dwError == 0) || (dwError == ERROR_ALREADY_EXISTS));
delete [] pSS;
}
//-----------------------------------------------------------------------------
void Snapshot_Startup()
{
static bool bDone = false;
if(!g_bSaveStateOnExit || bDone)
return;
Snapshot_LoadState();
bDone = true;
}
void Snapshot_Shutdown()
{
static bool bDone = false;
if(!g_bSaveStateOnExit || bDone)
return;
Snapshot_SaveState();
bDone = true;
}