project64/Source/Project64-core/N64System/Mips/Sram.cpp

223 lines
6.3 KiB
C++

/****************************************************************************
* *
* Project64 - A Nintendo 64 emulator. *
* http://www.pj64-emu.com/ *
* Copyright (C) 2012 Project64. All rights reserved. *
* *
* License: *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html *
* *
****************************************************************************/
#include "stdafx.h"
#include "Sram.h"
#include <Common/path.h>
#include <Windows.h>
CSram::CSram(bool ReadOnly) :
m_ReadOnly(ReadOnly),
m_hFile(NULL)
{
}
CSram::~CSram()
{
if (m_hFile)
{
CloseHandle(m_hFile);
m_hFile = NULL;
}
}
bool CSram::LoadSram()
{
CPath FileName;
FileName.SetDriveDirectory(g_Settings->LoadStringVal(Directory_NativeSave).c_str());
FileName.SetName(g_Settings->LoadStringVal(Game_GameName).c_str());
FileName.SetExtension("sra");
if (!FileName.DirectoryExists())
{
FileName.DirectoryCreate();
}
m_hFile = CreateFile(FileName, m_ReadOnly ? GENERIC_READ : GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, NULL);
if (m_hFile == INVALID_HANDLE_VALUE)
{
WriteTraceF(TraceError, __FUNCTION__ ": Failed to open (%s), ReadOnly = %d, LastError = %X", (LPCTSTR)FileName, m_ReadOnly, GetLastError());
return false;
}
SetFilePointer(m_hFile, 0, NULL, FILE_BEGIN);
return true;
}
void CSram::DmaFromSram(uint8_t * dest, int StartOffset, int len)
{
DWORD dwRead;
uint32_t i;
uint8_t tmp[4];
if (m_hFile == NULL)
{
if (!LoadSram())
{
return;
}
}
// Fix Dezaemon 3D saves
StartOffset = ((StartOffset >> 3) & 0xFFFF8000) | (StartOffset & 0x7FFF);
uint32_t Offset = StartOffset & 3;
if (Offset == 0)
{
SetFilePointer(m_hFile, StartOffset, NULL, FILE_BEGIN);
ReadFile(m_hFile, dest, len, &dwRead, NULL);
}
else
{
SetFilePointer(m_hFile, StartOffset - Offset, NULL, FILE_BEGIN);
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
for (i = 0; i < (4 - Offset); i++)
{
dest[i + Offset] = tmp[i];
}
for (i = 4 - Offset; i < len - Offset; i += 4)
{
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
switch (Offset)
{
case 1:
dest[i + 2] = tmp[0];
dest[i + 3] = tmp[1];
dest[i + 4] = tmp[2];
dest[i - 3] = tmp[3];
break;
case 2:
dest[i + 4] = tmp[0];
dest[i + 5] = tmp[1];
dest[i - 2] = tmp[2];
dest[i - 1] = tmp[3];
break;
case 3:
dest[i + 6] = tmp[0];
dest[i - 1] = tmp[1];
dest[i] = tmp[2];
dest[i + 1] = tmp[3];
break;
default:
break;
}
}
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
switch (Offset)
{
case 1:
dest[i - 3] = tmp[3];
break;
case 2:
dest[i - 2] = tmp[2];
dest[i - 1] = tmp[3];
break;
case 3:
dest[i - 1] = tmp[1];
dest[i] = tmp[2];
dest[i + 1] = tmp[3];
break;
default:
break;
}
}
}
void CSram::DmaToSram(uint8_t * Source, int StartOffset, int len)
{
DWORD dwWritten;
uint32_t i;
uint8_t tmp[4];
if (m_ReadOnly)
{
return;
}
if (m_hFile == NULL)
{
if (!LoadSram())
{
return;
}
}
// Fix Dezaemon 3D saves
StartOffset = ((StartOffset >> 3) & 0xFFFF8000) | (StartOffset & 0x7FFF);
uint32_t Offset = StartOffset & 3;
if (Offset == 0)
{
SetFilePointer(m_hFile, StartOffset, NULL, FILE_BEGIN);
WriteFile(m_hFile, Source, len, &dwWritten, NULL);
}
else
{
for (i = 0; i < (4 - Offset); i++)
{
tmp[i] = Source[i + Offset];
}
SetFilePointer(m_hFile, StartOffset - Offset, NULL, FILE_BEGIN);
WriteFile(m_hFile, tmp, (4 - Offset), &dwWritten, NULL);
SetFilePointer(m_hFile, Offset, NULL, FILE_CURRENT);
for (i = 4 - Offset; i < len - Offset; i += 4)
{
switch (Offset)
{
case 1:
tmp[0] = Source[i + 2];
tmp[1] = Source[i + 3];
tmp[2] = Source[i + 4];
tmp[3] = Source[i - 3];
break;
case 2:
tmp[0] = Source[i + 4];
tmp[1] = Source[i + 5];
tmp[2] = Source[i - 2];
tmp[3] = Source[i - 1];
break;
case 3:
tmp[0] = Source[i + 6];
tmp[1] = Source[i - 1];
tmp[2] = Source[i];
tmp[3] = Source[i + 1];
break;
default:
break;
}
WriteFile(m_hFile, tmp, 4, &dwWritten, NULL);
}
switch (Offset)
{
case 1:
tmp[0] = Source[i - 3];
break;
case 2:
tmp[0] = Source[i - 2];
tmp[0] = Source[i - 1];
break;
case 3:
tmp[0] = Source[i - 1];
tmp[0] = Source[i];
tmp[0] = Source[i + 1];
break;
default:
break;
}
SetFilePointer(m_hFile, 4 - Offset, NULL, FILE_CURRENT);
WriteFile(m_hFile, tmp, Offset, &dwWritten, NULL);
}
FlushFileBuffers(m_hFile);
}