private void FindChildren(List <NodeEntry> nodes, NodeEntry node, int maxNextId)
{
if (node.ChildId > -1)
{
var nextId = node.NextId;
if (nextId == -1)
{
nextId = maxNextId;
}
for (int i = node.ChildId; i < nextId; i++)
{
var possibleChild = nodes.FirstOrDefault(n => n.Id == i);
if (possibleChild == null)
{
throw new Exception();
}
if (possibleChild.ChildId > -1)//SubChild
{
FindChildren(nodes, possibleChild, nextId);
node.AddChild(possibleChild);
}
else
{
if (!possibleChild.IsChild)//was already added
{
node.AddChild(possibleChild);
}
}
}
}
}
private void ReadNodeInfos(BinaryReader reader)
{
var magicStartInt = BitConverter.ToUInt32(Encoding.ASCII.GetBytes(Constants.Magic.NODE_INFORMATION_START), 0);
var magicEndInt = BitConverter.ToUInt32(Encoding.ASCII.GetBytes(Constants.Magic.END_OF_FILE), 0);
reader.BaseStream.Seek(-8, SeekOrigin.End);
var infoStart = reader.ReadInt32();
if (reader.ReadUInt32() != magicEndInt)
{
throw new Exception("invalid file format");
}
reader.BaseStream.Seek(infoStart, SeekOrigin.Begin);
if (reader.ReadUInt32() != magicStartInt)
{
throw new Exception("invalid file format");
}
var length = reader.ReadPackedInt();
for (var i = 0; i < length; i++)
{
var name = reader.ReadPackedString();
var entry = new NodeEntry();
entry.NextId = reader.ReadInt32();
entry.ChildId = reader.ReadInt32();
entry.Offset = reader.ReadInt32();
entry.Size = reader.ReadInt32();
entry.Name = name;
FlatNodes.Add(entry);
}
reader.BaseStream.Position = 0;
}
public void LoadFromCompressedStream(Stream inputStream)
{
FlatNodes.Clear();
Nodes.Clear();
using (var reader = new BinaryReader(inputStream, Encoding.ASCII, true))
{
string magic = reader.ReadString(4);
Version1 = reader.ReadInt32();
Version2 = reader.ReadInt32();
SkippedHeaderBytes = reader.ReadBytes(9);
Version3 = reader.ReadInt32();
int blockInfoStart = (int)reader.BaseStream.Position;
reader.BaseStream.Seek(-8, SeekOrigin.End);
LastBlockOffset = reader.ReadInt32();
reader.BaseStream.Seek(LastBlockOffset, SeekOrigin.Begin);
string edonMagic = reader.ReadString(4);
var flags = new Flags(reader);
for (int i = 0; i < flags.Length; i++)
{
var tmpFlags = new Flags(reader.ReadByte());
string name = reader.ReadString(tmpFlags.Length);
var entry = new NodeEntry();
entry.NextId = reader.ReadInt32();
entry.ChildId = reader.ReadInt32();
entry.Offset = reader.ReadInt32();
entry.Size = reader.ReadInt32();
entry.Name = name;
FlatNodes.Add(entry);
}
}
inputStream.Seek(0, SeekOrigin.Begin);
var activeSaveFile = new SaveFileCompressionHelper();
var decompressedFile = activeSaveFile.Decompress(inputStream);
using (MemoryStream memoryStream = new MemoryStream(decompressedFile))
{
using (BinaryReader reader = new BinaryReader(memoryStream, Encoding.ASCII))
{
foreach (var node in FlatNodes)
{
reader.BaseStream.Position = node.Offset;
node.Id = reader.ReadInt32();
}
foreach (var node in FlatNodes)
{
if (!node.IsChild)
{
FindChildren(FlatNodes, node, FlatNodes.Count);
}
if (node.NextId > -1)
{
node.SetNextNode(FlatNodes.Where(n => n.Id == node.NextId).FirstOrDefault());
}
}
Nodes.AddRange(FlatNodes.Where(n => !n.IsChild));
CalculateTrueSizes();
ParserUtils.ParseChildren(Nodes, reader, _parsers);
}
}
}
public void AddChild(NodeEntry child)
{
child.IsChild = true;
if (Children.Count == 0)
{
child.IsFirstChild = true;
}
Children.Add(child);
child.SetParent(this);
}
public void Write(NodeEntry node)
{
var isChild = _currentDepth > _lastDepth;
var isNext = _currentDepth == _lastDepth;
var isParent = _currentDepth < _lastDepth;
_lastDepth = _currentDepth;
_currentDepth++;
var currentId = _currentId++;
var nodeInfo = new SaveFile.NodeInfo
{
Name = node.Name,
Offset = (int)BaseStream.Position
};
if (isChild)
{
_nodeInfos[_nodeInfos.Count - 1].ChildId = currentId;
}
if (_nodeInfos.Count > 0 && isNext)
{
_nodeInfos[_nodeInfos.Count - 1].ChildId = -1;
_nodeInfos[_nodeInfos.Count - 1].NextId = currentId;
}
if (isParent)
{
_nodeInfos[_nodeInfos.Count - 1].ChildId = -1;
_nodeInfos[_nodeInfos.Count - 1].NextId = -1;
var lastIdSameLevel = _nodeMetaInfos.LastOrDefault(n => n.Depth == _currentDepth).Id;
_nodeInfos[lastIdSameLevel].NextId = currentId;
}
_nodeInfos.Add(nodeInfo);
_nodeMetaInfos.Add(new NodeMeta(currentId, _currentDepth));
var parser = GetParser(node);
Write(currentId);
parser.Write(this, node);
nodeInfo.Size = (int)(BaseStream.Position - nodeInfo.Offset);
if (node.WritesOwnTrailingSize)
{
nodeInfo.Size -= node.TrailingSize;
}
_currentDepth--;
}
private void CalculateTrueSizes(IReadOnlyList <NodeEntry> nodes, int maxLength)
{
for (var i = 0; i < nodes.Count; ++i)
{
var currentNode = nodes[i];
var nextNode = i + 1 < nodes.Count ? nodes[i + 1] : null;
if (currentNode.Children.Count > 0)
{
// Check if there is a blob before the first child
var nextChild = currentNode.Children.First();
var blobSize = nextChild.Offset - currentNode.Offset;
currentNode.DataSize = blobSize;
CalculateTrueSizes(currentNode.Children, maxLength);
}
else
{
currentNode.DataSize = currentNode.Size;
}
if (nextNode != null)
{
// There is a node after us. Check if there is a blob in between
var blobSize = nextNode.Offset - (currentNode.Offset + currentNode.Size);
if (blobSize < 0)
{
throw new InvalidDataException("Found a datablob with negative size");
}
currentNode.TrailingSize = blobSize;
}
else
{
// There might be a blob that is part of the children due to the parents size, check for that
if (currentNode.GetParent() == null)
{
// This is the last node on the root list. Trailing data should have been cought by the last inner child and assigned here but check again.
var lastNodeEnd = currentNode.Offset + currentNode.Size;
Debug.Assert(lastNodeEnd <= maxLength);
if (lastNodeEnd < maxLength)
{
// There is a trailing blob
currentNode.TrailingSize = maxLength - lastNodeEnd;
}
continue;
}
nextNode = currentNode.GetParent().GetNextNode();
if (nextNode == null)
{
// This is the last child on the last node. The next valid offset would be the end of the data
// Create a virtual node for this so the code below can grab the offset
nextNode = new NodeEntry();
nextNode.Offset = maxLength;
}
var parentMax = currentNode.GetParent().Offset + currentNode.GetParent().Size;
var childMax = currentNode.Offset + currentNode.Size;
// The parent size should never be smaller than the end of the last child.
Debug.Assert(parentMax >= childMax);
var blobSize = nextNode.Offset - (currentNode.Offset + currentNode.Size);
if (blobSize < 0)
{
throw new InvalidDataException("Found a datablob with negative size");
}
if (parentMax > childMax)
{
// Blob belongs to this child
currentNode.TrailingSize = blobSize;
}
else if (parentMax == childMax)
{
// Blob belongs to the parent but as trailing.
currentNode.GetParent().TrailingSize = blobSize;
}
}
}
}
private INodeParser GetParser(NodeEntry node)
{
return(GetParser(node.Name));
}
public void SetParent(NodeEntry parent)
{
_parent = parent;
}
public void SetPreviousNode(NodeEntry previousNode)
{
_previousNode = previousNode;
}
public void SetNextNode(NodeEntry nextNode)
{
_nextNode = nextNode;
_nextNode.SetPreviousNode(this);
}