private void SaveStateBodyBinary(BinaryWriter writer)
{
writer.Write(Count);
for (var i = _firstStateIndex; i != _nextStateIndex; i = (i + 1) & STATEMASK)
{
writer.Write(_states[i].Frame);
writer.Write(_states[i].Size);
}
if (Count != 0)
{
var startByte = _states[_firstStateIndex].Start;
var endByte = (_states[HeadStateIndex].Start + _states[HeadStateIndex].Size) & _sizeMask;
var destStream = SpanStream.GetOrBuild(writer.BaseStream);
if (startByte > endByte)
{
_backingStore.Position = startByte;
WaterboxUtils.CopySome(_backingStore, writer.BaseStream, Size - startByte);
startByte = 0;
}
{
_backingStore.Position = startByte;
WaterboxUtils.CopySome(_backingStore, writer.BaseStream, endByte - startByte);
}
}
}
private unsafe void RefillMaster(ZwinderBuffer.StateInformation state)
{
var lengthHolder = 0;
var lengthHolderSpan = new Span <byte>(&lengthHolder, 4);
var zeldas = SpanStream.GetOrBuild(state.GetReadStream());
zeldas.Read(lengthHolderSpan);
_masterLength = lengthHolder;
fixed(byte *buffer_ = _master)
{
int *buffer = (int *)buffer_;
while (zeldas.Read(lengthHolderSpan) == 4)
{
if ((lengthHolder & IS_GAP) != 0)
{
buffer += lengthHolder & ~IS_GAP;
}
else
{
zeldas.Read(new Span <byte>(buffer, lengthHolder * 4));
buffer += lengthHolder;
}
}
}
_masterFrame = state.Frame;
}
public LoadStateStream(Stream backingStore, long offset, long size, long mask)
{
_backingStore = backingStore;
_backingStoreSS = SpanStream.GetOrBuild(backingStore);
_offset = offset;
_size = size;
_mask = mask;
}
/// <summary>
///
/// </summary>
/// <param name="backingStore">The ringbuffer to write into</param>
/// <param name="offset">Offset into the buffer to start writing (and treat as position 0 in the stream)</param>
/// <param name="mask">Buffer size mask, used to wrap values in the ringbuffer correctly</param>
/// <param name="notifySize">
/// If the stream will exceed this size, notifySizeReached must be called before clobbering any data
/// </param>
/// <param name="notifySizeReached">
/// The callback that will be called when notifySize is about to be exceeded. Can either return a new larger notifySize,
/// or abort processing with an IOException. This must fail if size is going to exceed buffer.Length, as nothing else
/// is preventing that case.
/// </param>
public SaveStateStream(Stream backingStore, long offset, long mask, long notifySize, Func <long> notifySizeReached)
{
_backingStore = backingStore;
_backingStoreSS = SpanStream.GetOrBuild(backingStore);
_offset = offset;
_mask = mask;
_notifySize = notifySize;
_notifySizeReached = notifySizeReached;
}
public static ReadCallback MakeCallbackForReader(Stream s)
{
var ss = SpanStream.GetOrBuild(s);
return((_unused, data, size) =>
{
try
{
var count = (int)size;
var n = ss.Read(new Span <byte>((void *)data, count));
return Z.SS(n);
}
catch
{
return Z.SS(-1);
}
});
}
// public delegate UIntPtr /*MissingFileResult*/ FileCallback(IntPtr userdata, UIntPtr /*string*/ name);
public static WriteCallback MakeCallbackForWriter(Stream s)
{
var ss = SpanStream.GetOrBuild(s);
return((_unused, data, size) =>
{
try
{
var count = (int)size;
ss.Write(new ReadOnlySpan <byte>((void *)data, (int)size));
return 0;
}
catch
{
return -1;
}
});
}
public unsafe void Capture(int frame)
{
Sync();
if (!_active)
{
return;
}
if (_masterFrame == -1)
{
var sss = new SaveStateStream(this);
_stateSource.SaveStateBinary(new BinaryWriter(sss));
(_master, _scratch) = (_scratch, _master);
_masterLength = (int)sss.Position;
_masterFrame = frame;
_count++;
return;
}
if (!_buffer.WillCapture(_masterFrame))
{
return;
}
{
var sss = new SaveStateStream(this);
_stateSource.SaveStateBinary(new BinaryWriter(sss));
Work(() =>
{
_buffer.Capture(_masterFrame, underlyingStream_ =>
{
var zeldas = SpanStream.GetOrBuild(underlyingStream_);
if (_master.Length < _scratch.Length)
{
var replacement = new byte[_scratch.Length];
Array.Copy(_master, replacement, _master.Length);
_master = replacement;
}
var lengthHolder = _masterLength;
var lengthHolderSpan = new ReadOnlySpan <byte>(&lengthHolder, 4);
zeldas.Write(lengthHolderSpan);
fixed(byte *older_ = _master)
fixed(byte *newer_ = _scratch)
{
int *older = (int *)older_;
int *newer = (int *)newer_;
int lastIndex = (Math.Min(_masterLength, (int)sss.Position) + 3) / 4;
int lastOldIndex = (_masterLength + 3) / 4;
int *olderEnd = older + lastIndex;
int *from = older;
int *to = older;
while (older < olderEnd)
{
if (*older++ == *newer++)
{
if (to < from)
{
// Save on [to, from]
lengthHolder = (int)(from - to);
zeldas.Write(lengthHolderSpan);
zeldas.Write(new ReadOnlySpan <byte>(to, lengthHolder * 4));
}
to = older;
}
else
{
if (from < to)
{
// encode gap [from, to]
lengthHolder = (int)(to - from) | IS_GAP;
zeldas.Write(lengthHolderSpan);
}
from = older;
}
}
if (from < to)
{
// encode gap [from, to]
lengthHolder = (int)(to - from) | IS_GAP;
zeldas.Write(lengthHolderSpan);
}
if (lastOldIndex > lastIndex)
{
from += lastOldIndex - lastIndex;
}
if (to < from)
{
// Save on [to, from]
lengthHolder = (int)(from - to);
zeldas.Write(lengthHolderSpan);
zeldas.Write(new ReadOnlySpan <byte>(to, lengthHolder * 4));
}
}
(_master, _scratch) = (_scratch, _master);
_masterLength = (int)sss.Position;
_masterFrame = frame;
_count++;
});
});
}
}
