public IList <IArchiveFileInfo> Load(Stream input)
{
using var br = new BinaryReaderX(input, true, ByteOrder.BigEndian);
// Read node tree
_root = FabNode.Read(br);
// Read files
var result = new List <IArchiveFileInfo>();
foreach (var fileBranch in _root.Nodes.Where(x => x.SubType == "FILE"))
{
var fileName = fileBranch.Nodes.FirstOrDefault(x => x.Type == "NAME")?.AsString();
if (result.Any(x => x.FilePath.ToRelative().FullName == fileName))
{
continue;
}
var fileDataNode = fileBranch.Nodes.FirstOrDefault(x => x.SubType == "DATA");
var userNode = fileDataNode?.Nodes.FirstOrDefault(x => x.Type == "USER");
var relevantNode = userNode ?? fileDataNode;
var fileStream = relevantNode?.Data;
if (userNode?.SubType == "LZ4C")
{
result.Add(new FabArchiveFileInfo(fileStream, fileName, Compressions.Lz4Headerless, PeekDecompressedLength(fileStream))
{
DataNode = relevantNode
});
}
else
{
result.Add(new FabArchiveFileInfo(fileStream, fileName)
{
DataNode = relevantNode
});
}
}
return(result);
}
public static FabNode Read(BinaryReaderX br)
{
// Read header
var header = br.ReadType <FabNodeHeader>();
var result = new FabNode {
_header = header
};
switch (header.magic)
{
case "FBRC":
switch (header.description)
{
case "BNDL":
var numNode = Read(br);
var count = numNode.AsInt32();
result.Nodes.Add(numNode);
for (var i = 0; i < count; i++)
{
result.Nodes.Add(Read(br));
}
break;
case "TXTR":
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
break;
}
break;
case "USER":
var offset1 = br.BaseStream.Position;
br.BaseStream.Position += (header.size - 4 + 1) & ~1;
result.Data = new SubStream(br.BaseStream, offset1, header.size - 4);
break;
case "LIST":
switch (header.description)
{
case "FILE":
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
break;
case "META":
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
result.Nodes.Add(Read(br));
break;
case "DATA":
var nextHeader = br.ReadType <FabNodeHeader>();
br.BaseStream.Position -= 0xC;
// Specially handle USER node to unwrap the "actual" file data from it
if (nextHeader.magic == "USER")
{
result.Nodes.Add(Read(br));
}
else
{
var offset2 = br.BaseStream.Position;
br.BaseStream.Position += (header.size - 4 + 1) & ~1;
result.Data = new SubStream(br.BaseStream, offset2, header.size - 4);
}
break;
}
break;
// By default treat content as data
default:
var offset = br.BaseStream.Position - 4;
br.BaseStream.Position += (header.size - 4 + 1) & ~1;
result._headerLength = 0x8;
result.Data = new SubStream(br.BaseStream, offset, header.size);
break;
}
return(result);
}