public void Save(Stream output)
{
MemoryStream memory = new MemoryStream();
UnrealStream stream = new UnrealStream(memory, false, this.Version);
memory.WriteValueU32(this.Version);
this.Serialize(stream);
if (this.Version >= 27)
{
memory.Position = 0;
uint checksum = 0;
byte[] data = new byte[1024];
while (memory.Position < memory.Length)
{
int read = memory.Read(data, 0, 1024);
checksum = CRC32.Compute(data, 0, read, checksum);
}
this.Checksum = checksum;
memory.WriteValueU32(checksum);
}
// copy out
{
memory.Position = 0;
byte[] data = new byte[1024];
while (memory.Position < memory.Length)
{
int read = memory.Read(data, 0, 1024);
output.Write(data, 0, read);
}
}
}
public static SaveFile Load(Stream input)
{
SaveFile save = new SaveFile();
save.Version = input.ReadValueU32();
if (save.Version != 29)
{
throw new FormatException("todo: fix earlier save version support (not really important)");
}
UnrealStream stream = new UnrealStream(input, true, save.Version);
save.Serialize(stream);
if (save.Version >= 27)
{
// sanity check, cos if we read a strange crc it'll break anyway
if (input.Position != input.Length - 4)
{
throw new FormatException("bad checksum position");
}
save.Checksum = input.ReadValueU32();
}
// did we consume the entire save file?
if (input.Position != input.Length)
{
throw new FormatException("did not consume entire file");
}
return save;
}
