public static IBSA Open(string filename)
{
var stream = new BufferedStream(new FileStream(filename, FileMode.OpenOrCreate, FileAccess.ReadWrite), 8 * 1024 * 1024);
var checksumStopwatch = Stopwatch.StartNew();
byte[] checksum = MD5.Create().ComputeHash(stream);
checksumStopwatch.Stop();
Debug.WriteLine(
"MD5 checksum {0}\nTook {1}",
BitConverter.ToString(checksum).Replace("-", string.Empty).ToLower(),
checksumStopwatch.Elapsed
);
stream.Seek(0, SeekOrigin.Begin);
var reader = new BinaryReader(stream);
var signature = (ArchiveSignature)reader.ReadUInt32();
var version = (ArchiveVersion)reader.ReadUInt32();
if (File.Exists(filename + ".xml"))
{
IBSA archive = null;
using (var xmlReader = new StreamReader(string.Format("{0}.xml", filename)))
{
var serializer = new XmlSerializer(typeof(BSA));
try
{
archive = (IBSA)serializer.Deserialize(xmlReader);
archive.Filename = filename;
archive.SetStream(stream);
} catch (InvalidOperationException ioe)
{
}
}
if (archive != null && ByteArrayCompare(checksum, archive.Checksum))
{
return(archive);
}
else
{
Debug.WriteLine("Contents Changed, need recalculate");
}
}
stream.Close();
if (signature == ArchiveSignature.Oblivion && version == ArchiveVersion.Fallout3)
{
return(new Fo3Archive(filename));
}
else
{
throw new UnsupportedArchiveException(signature, version);
}
}
private static void CreateAssetPatch(Settings settings, IBSA original, Fo3File originalRecord, Fo3File resultRecord, RecordAction recordAction)
{
string patchName;
string patchFile;
// @todo: memory stream and name with md5
using (var patchStream = new MemoryStream())
{
// @todo: lock
byte[] originalRecordBytes;
if (original != null)
{
lock (original)
{
originalRecordBytes = originalRecord.GetData(original.Reader);
}
}
else
{
originalRecordBytes = originalRecord.GetData();
}
var referenceBytes = resultRecord.GetData();
BsDiff.Create(originalRecordBytes, referenceBytes, patchStream);
patchStream.Seek(0, SeekOrigin.Begin);
patchName = new Guid(MD5.Create().ComputeHash(patchStream)).ToString();
recordAction.PatchName = patchName;
patchFile = string.Format("{0}\\{1}.patch", settings.GetTempFolder("Patches"), patchName);
try
{
using (var fileStream = new FileStream(patchFile, FileMode.CreateNew))
{
patchStream.Seek(0, SeekOrigin.Begin);
patchStream.CopyTo(fileStream);
}
}
catch (IOException exc)
{
// ignored
}
}
}