public static bool DeserializeInto <T>(ref T target, Stream serializedObjectReader, out byte[] lastKnownHash)
{
lastKnownHash = NullHash;
if (serializedObjectReader.Length != 0)
{
serializedObjectReader.Seek(0, SeekOrigin.Begin);
using (GZipStream decompressor = new GZipStream(serializedObjectReader, CompressionMode.Decompress))
using (SHA256StreamHasher readAndHash = new SHA256StreamHasher(decompressor))
{
BinaryFormatter formatter = new BinaryFormatter();
try
{
target = (T)formatter.Deserialize(readAndHash);
}
catch (InvalidDataException)
{
return(false); // Not valid GZIP compressed data
}
catch (SerializationException)
{
return(false); // Not valid BinaryFormatter serialized object
}
lastKnownHash = readAndHash.ComputeHash();
}
}
return(true);
}
/// <summary>
/// Returns true if the serialized representation of obj has changed since the lastKnownHash
/// was produced.
/// </summary>
public static bool ModifiedSince <T>(T obj, byte[] lastKnownHash, out byte[] newHash)
{
if (obj == null)
{
newHash = NullHash;
}
else
{
SHA256StreamHasher hasher = new SHA256StreamHasher();
SerializeIntoStreamImpl(obj, hasher, false);
newHash = hasher.ComputeHash();
}
return((lastKnownHash == null) || !HashEquals(newHash, lastKnownHash));
}