public static SFXSaveGameFile Read(Stream input)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
var save = new SFXSaveGameFile()
{
_Version = input.ReadValueU32(Endian.Little)
};
if (save._Version != 29 && save._Version.Swap() != 29 &&
save._Version != 59 && save._Version.Swap() != 59)
{
throw new FormatException("unexpected version");
}
var endian = save._Version == 29 || save._Version == 59
? Endian.Little
: Endian.Big;
if (endian == Endian.Big)
{
save._Version = save._Version.Swap();
}
var reader = new Unreal.FileReader(input, save._Version, endian);
save.Serialize(reader);
if (save._Version >= 27)
{
if (input.Position != input.Length - 4)
{
throw new FormatException("bad checksum position");
}
save._Checksum = input.ReadValueU32();
}
if (input.Position != input.Length)
{
throw new FormatException("did not consume entire file");
}
save.Endian = endian;
return(save);
}
public static void Write(SFXSaveGameFile save, Stream output)
{
if (save == null)
{
throw new ArgumentNullException("save");
}
if (output == null)
{
throw new ArgumentNullException("output");
}
using (var memory = new MemoryStream())
{
memory.WriteValueU32(save.Version, save._Endian);
var writer = new Unreal.FileWriter(memory, save._Version, save._Endian);
save.Serialize(writer);
if (save._Version >= 27)
{
memory.Position = 0;
uint checksum = 0;
var buffer = new byte[1024];
while (memory.Position < memory.Length)
{
int read = memory.Read(buffer, 0, 1024);
checksum = Crc32.Compute(buffer, 0, read, checksum);
}
save._Checksum = checksum;
memory.WriteValueU32(checksum, save._Endian);
}
memory.Position = 0;
output.WriteFromStream(memory, memory.Length);
}
}