Save state support

src/pse/host_interface.cpp

@@ -0,0 +1,53 @@
+#include "host_interface.h"
+#include "YBaseLib/ByteStream.h"
+#include "system.h"
+
+HostInterface::HostInterface() = default;
+
+HostInterface::~HostInterface() = default;
+
+bool HostInterface::LoadState(const char* filename)
+{
+  ByteStream* stream;
+  if (!ByteStream_OpenFileStream(filename, BYTESTREAM_OPEN_READ | BYTESTREAM_OPEN_STREAMED, &stream))
+    return false;
+
+  ReportMessage(SmallString::FromFormat("Loading state from %s...", filename));
+
+  const bool result = m_system->LoadState(stream);
+  if (!result)
+  {
+    ReportMessage(SmallString::FromFormat("Loading state from %s failed. Resetting.", filename));
+    m_system->Reset();
+  }
+
+  stream->Release();
+  return result;
+}
+
+bool HostInterface::SaveState(const char* filename)
+{
+  ByteStream* stream;
+  if (!ByteStream_OpenFileStream(filename,
+                                 BYTESTREAM_OPEN_CREATE | BYTESTREAM_OPEN_WRITE | BYTESTREAM_OPEN_TRUNCATE |
+                                   BYTESTREAM_OPEN_ATOMIC_UPDATE | BYTESTREAM_OPEN_STREAMED,
+                                 &stream))
+  {
+    return false;
+  }
+
+  const bool result = m_system->SaveState(stream);
+  if (!result)
+  {
+    ReportMessage(SmallString::FromFormat("Saving state to %s failed.", filename));
+    stream->Discard();
+  }
+  else
+  {
+    ReportMessage(SmallString::FromFormat("State saved to %s.", filename));
+    stream->Commit();
+  }
+
+  stream->Release();
+  return result;
+}