private void RewindOne()
{
if (!Global.Emulator.HasSavestates())
{
return;
}
var ms = _rewindBuffer.PopMemoryStream();
byte[] buf = ms.GetBuffer();
var reader = new BinaryReader(ms);
var fullstate = reader.ReadBoolean();
if (fullstate)
{
if (_rewindDeltaEnable)
{
UpdateLastState(buf, 1, buf.Length - 1);
}
Global.Emulator.AsStatable().LoadStateBinary(reader);
}
else
{
var output = new MemoryStream(_lastState);
int index = 1;
int offset = 0;
while (index < buf.Length)
{
int offsetDelta = (int)VLInteger.ReadUnsigned(buf, ref index);
int length = (int)VLInteger.ReadUnsigned(buf, ref index);
offset += offsetDelta;
output.Position = offset;
output.Write(buf, index, length);
index += length;
}
output.Position = 0;
Global.Emulator.AsStatable().LoadStateBinary(new BinaryReader(output));
output.Close();
}
reader.Close();
}
private void LoadPreviousState()
{
using (var reader = new BinaryReader(GetPreviousStateMemoryStream()))
{
byte[] buf = ((MemoryStream)reader.BaseStream).GetBuffer();
bool fullState = reader.ReadByte() == 1;
if (_rewindDeltaEnable)
{
if (fullState)
{
UpdateLastState(buf, 1, buf.Length - 1);
}
else
{
int index = 1;
int offset = 0;
while (index < buf.Length)
{
int offsetDelta = (int)VLInteger.ReadUnsigned(buf, ref index);
int length = (int)VLInteger.ReadUnsigned(buf, ref index);
offset += offsetDelta;
Buffer.BlockCopy(buf, index, _lastState, offset, length);
index += length;
}
}
using (var lastStateReader = new BinaryReader(new MemoryStream(_lastState)))
{
Global.Emulator.AsStatable().LoadStateBinary(lastStateReader);
}
}
else
{
if (!fullState)
{
throw new InvalidOperationException();
}
Global.Emulator.AsStatable().LoadStateBinary(reader);
}
}
}