private U8Directory ReadFileTable(uint nodeOffset)
{
U8Directory root = new U8Directory(null, ROOT_DIR);
filestream.Position = nodeOffset;
U8Node rootNode = new U8Node()
{
type = filestream.ReadUInt8(),
nameOffset = filestream.ReadUInt24BE(),
dataOffset = filestream.ReadUInt32BE(),
size = filestream.ReadUInt32BE()
};
if (rootNode.type != DIR)
{
throw new InvalidDataException("Root node of U8 archive was not a directory");
}
var stringTableOffset = nodeOffset + 12 * rootNode.size;
var lastNodes = new Stack <uint>();
lastNodes.Push(rootNode.size);
U8Directory currentDir = root;
for (var i = 1; i < rootNode.size; i++)
{
if (i == lastNodes.Peek())
{
lastNodes.Pop();
currentDir = currentDir.Parent as U8Directory;
}
var node = new U8Node()
{
type = filestream.ReadUInt8(),
nameOffset = filestream.ReadUInt24BE(),
dataOffset = filestream.ReadUInt32BE(),
size = filestream.ReadUInt32BE()
};
var pos = filestream.Position;
filestream.Position = stringTableOffset + node.nameOffset;
var name = filestream.ReadASCIINullTerminated();
filestream.Position = pos;
if (node.type == DIR)
{
var newDir = new U8Directory(currentDir, name);
currentDir.AddDir(newDir);
currentDir = newDir;
lastNodes.Push(node.size);
}
else
{
currentDir.AddFile(new OffsetFile(name, currentDir, filestream, node.dataOffset, node.size));
}
}
return(root);
}
/// <summary>
/// Open the .far archive which is the given file.
/// </summary>
/// <param name="path"></param>
private U8Package(IFile f)
{
FileName = f.Name;
filestream = f.GetStream();
if (filestream.ReadUInt32BE() != MAGIC)
{
throw new InvalidDataException("Package is not a U8 package.");
}
uint rootNode = filestream.ReadUInt32BE();
uint dataOffset = filestream.ReadUInt32BE();
root = ReadFileTable(rootNode);
}
public U8Directory(U8Directory parent, string name) : base(parent, name)
{
}