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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia 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.
//
// Nestopia 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 Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#include <cstring>
#include "NstInpDevice.hpp"
#include "NstInpTurboFile.hpp"
namespace Nes
{
namespace Core
{
namespace Input
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
TurboFile::TurboFile(const Cpu& cpu)
: Device(cpu,Api::Input::TURBOFILE)
{
std::memset( ram, 0, SIZE );
file.Load( File::TURBOFILE, ram, SIZE );
}
TurboFile::~TurboFile()
{
file.Save( File::TURBOFILE, ram, SIZE );
}
void TurboFile::Reset()
{
pos = 0x00;
bit = 0x01;
old = 0x00;
out = 0x00;
}
void TurboFile::SaveState(State::Saver& saver,const byte id) const
{
saver.Begin( AsciiId<'T','F'>::R(0,0,id) );
uint count;
for (count=0; bit && bit != (1U << count); ++count);
const byte data[3] =
{
pos & 0xFF,
pos >> 8,
count | (old << 1) | (out << 2)
};
saver.Begin( AsciiId<'R','E','G'>::V ).Write( data ).End();
saver.Begin( AsciiId<'R','A','M'>::V ).Compress( ram ).End();
saver.End();
}
void TurboFile::LoadState(State::Loader& loader,const dword id)
{
if (id == AsciiId<'T','F'>::V)
{
while (const dword chunk = loader.Begin())
{
switch (chunk)
{
case AsciiId<'R','E','G'>::V:
{
State::Loader::Data<3> data( loader );
pos = data[0] | (data[1] << 8 & 0x1F00);
bit = 1U << (data[2] & 0x7);
old = data[2] >> 1 & WRITE_BIT;
out = data[2] >> 2 & READ_BIT;
break;
}
case AsciiId<'R','A','M'>::V:
loader.Uncompress( ram );
break;
}
loader.End();
}
}
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
void TurboFile::Poke(uint data)
{
if (!(data & NO_RESET))
{
pos = 0x00;
bit = 0x01;
}
const uint advance = old;
old = data & WRITE_ENABLE;
if (old)
{
ram[pos] = (ram[pos] & ~bit) | (bit * (data & WRITE_BIT));
}
else if (advance)
{
if (bit != 0x80)
{
bit <<= 1;
}
else
{
bit = 0x01;
pos = (pos + 1) & (SIZE-1);
}
}
out = (ram[pos] & bit) ? READ_BIT : 0;
}
uint TurboFile::Peek(uint port)
{
return port ? out : 0;
}
}
}
}
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