public void Save(Stream stream)
{
var writer = new EndianAwareBinaryWriter(stream);
var serializer = new RobloxSerializer(this);
ReferentProvider.ClearCache(); // Clearing existing referent cache guarantees that referents won't be fragmented
var instances = GetChildFirstInstanceEnumerator().ToArray();
var typeGroups = instances.GroupBy(n => n.ClassName).OrderBy(n => n.Key).ToDictionary(n => n.Key, n => n.ToArray());
var typeCount = typeGroups.Count;
var objectCount = typeGroups.Aggregate(0, (acc, pair) => acc + pair.Value.Length);
writer.WriteBytes(Signatures.Signature); // File signature
writer.WriteInt32(typeCount); // Generic header values
writer.WriteInt32(objectCount);
writer.WriteInt32(0); // Reserved
writer.WriteInt32(0); // Reserved
// Write type headers
var typeHeaders = new TypeHeader[typeCount];
var nextTypeId = 0;
foreach (var typeGroup in typeGroups)
{
var typeHeader = new TypeHeader(typeGroup.Key, nextTypeId, typeGroup.Value.Select(n => ReferentProvider.GetReferent(n)).ToArray());
if (IsSingleton(typeGroup))
{
typeHeader.AdditionalData = new byte[typeHeader.InstanceCount];
for (var i = 0; i < typeHeader.InstanceCount; i++)
{
typeHeader.AdditionalData[i] = 0x1;
}
}
typeHeaders[nextTypeId] = typeHeader;
var bytes = typeHeader.Serialize();
writer.WriteBytes(Signatures.TypeHeaderSignature);
RobloxLZ4.WriteBlock(stream, bytes);
nextTypeId++;
}
// Write property data
foreach (var typeGroup in typeGroups)
{
var typeHeader = typeHeaders.First(n => n.Name == typeGroup.Key);
var instanceTypes = serializer.GetUniqueProperties(typeGroup.Value);
var propertyBlocks = instanceTypes.Select(propertyDescriptor => serializer.FillPropertyBlock(propertyDescriptor.Name, propertyDescriptor.Type, typeHeader.TypeId, typeGroup.Value, ReferentProvider)).ToList();
foreach (var propertyBlock in propertyBlocks)
{
var bytes = propertyBlock.Serialize();
writer.WriteBytes(Signatures.PropBlockSignature);
RobloxLZ4.WriteBlock(stream, bytes);
}
}
// Build parent child referent arrays
var parentData = Util.BuildParentData(instances, ReferentProvider);
var parentDataBytes = Util.SerializeParentData(parentData);
writer.WriteBytes(Signatures.ParentDataSignature);
RobloxLZ4.WriteBlock(stream, parentDataBytes);
// Write ending signature
writer.WriteBytes(Signatures.EndSignature);
writer.WriteBytes(Signatures.FileEndSignature);
}
internal static void ReadRaw(EndianAwareBinaryReader reader, out int typeCount, out int objectCount, out TypeHeader[] typeHeaders, out Dictionary <int, List <PropertyBlock> > propertyData, out Tuple <int, int>[] childParentPairs)
{
// Check file signature
var signatureBytes = reader.ReadBytes(Signatures.Signature.Length);
if (!signatureBytes.SequenceEqual(Signatures.Signature))
{
throw new InvalidRobloxFileException("The file signature does not match.");
}
typeCount = reader.ReadInt32();
objectCount = reader.ReadInt32();
reader.ReadInt32(); // Reserved
reader.ReadInt32(); // Reserved
// Deserialize type headers
typeHeaders = new TypeHeader[typeCount];
for (var i = 0; i < typeCount; i++)
{
var typeHeaderSignature = reader.ReadBytes(Signatures.TypeHeaderSignature.Length);
if (!typeHeaderSignature.SequenceEqual(Signatures.TypeHeaderSignature))
{
throw new InvalidRobloxFileException("Invalid type header signature.");
}
var decompressedBytes = RobloxLZ4.ReadBlock(reader.Stream);
var typeHeader = TypeHeader.Deserialize(decompressedBytes);
typeHeaders[i] = typeHeader;
}
// Read property data
propertyData = new Dictionary <int, List <PropertyBlock> >(); // Key is type id
byte[] lastPropSignature;
while (true)
{
lastPropSignature = reader.ReadBytes(Signatures.PropBlockSignature.Length);
if (!lastPropSignature.SequenceEqual(Signatures.PropBlockSignature))
{
break;
}
var decompressedBytes = RobloxLZ4.ReadBlock(reader.Stream);
var propertyBlock = PropertyBlock.Deserialize(decompressedBytes, typeHeaders);
if (propertyBlock == null)
{
continue;
}
if (!propertyData.ContainsKey(propertyBlock.TypeId))
{
propertyData.Add(propertyBlock.TypeId, new List <PropertyBlock>());
}
propertyData[propertyBlock.TypeId].Add(propertyBlock);
}
if (!lastPropSignature.SequenceEqual(Signatures.ParentDataSignature))
{
throw new InvalidRobloxFileException("Missing parent data section.");
}
var parentData = RobloxLZ4.ReadBlock(reader.Stream);
childParentPairs = Util.ReadParentData(parentData);
var endSignature = reader.ReadBytes(Signatures.EndSignature.Length);
if (!endSignature.SequenceEqual(Signatures.EndSignature))
{
throw new InvalidRobloxFileException("End signature is missing or invalid.");
}
}