/// <summary>
/// Parse a directory for its contents.
/// </summary>
/// <param name="name">The name of this directory.</param>
/// <param name="base_offset">Location of its filename infos.</param>
/// <param name="nodes">File descriptor dictionary</param>
/// <returns></returns>
private FSGIMGDirectory RecursivelyGetFiles(FSGIMGDirectory parent, string name, long base_offset, string path_acc, Dictionary <uint, file_descriptor> nodes)
{
filestream.Position = base_offset;
string filename;
FSGIMGDirectory ret = new FSGIMGDirectory(parent, name, base_offset);
while ((filename = filestream.ReadASCIINullTerminated()) != "")
{
long pos = filestream.Position;
string real_name = filename.Substring(1);
file_descriptor desc;
string nextPath = path_acc == "" ? real_name : $"{path_acc}/{real_name}";
nodes.TryGetValue(Hash(nextPath), out desc);
if (filename[0] == 'D')
{
ret.AddDir(RecursivelyGetFiles(ret, real_name, desc.data_offset, nextPath, nodes));
filestream.Position = pos;
}
else if (filename[0] == 'F')
{
ret.AddFile(new OffsetFile(real_name, ret, filestream, desc.data_offset, desc.size));
}
else
{
throw new InvalidDataException($"Got invalid filename prefix: {filename[0]}.");
}
}
return(ret);
}
public FSGIMGPackage(IFile f)
{
FileName = f.Name;
var parts = new List <Stream>(1);
parts.Add(f.GetStream());
if (f.Name.Split('.').Length > 2) // this is a .part* file
{
int partNum = 1;
IFile tmp;
while (f.Parent.TryGetFile(f.Name.Substring(0, f.Name.Length - 1) + partNum, out tmp))
{
var fs = tmp.GetStream();
parts.Add(fs);
partNum++;
}
}
filestream = new MultiStream(parts);
if (filestream.ReadASCIINullTerminated(16) != "FSG-FILE-SYSTEM")
{
throw new InvalidDataException("FSG-FILE-SYSTEM header not found.");
}
filestream.ReadUInt32BE(); // unknown, == 2
uint header_length = filestream.ReadUInt32BE();
uint num_sectors = filestream.ReadUInt32BE();
//points to a list of all (used) sectors?
//starting at 0x180 and increasing by 0x80 up to (num_sectors + 3) << 17
uint sectormap_offset = filestream.ReadUInt32BE();
uint base_offset = filestream.ReadUInt32BE();
filestream.ReadUInt32BE(); // unknown, read buffer size?
filestream.ReadUInt32BE(); // unknown, == 8
uint num_files = filestream.ReadUInt32BE();
uint zero = filestream.ReadUInt32BE();
uint checksum = filestream.ReadUInt32BE();
var nodes = new Dictionary <uint, file_descriptor>((int)num_files);
byte[] sector_types = new byte[num_sectors + (base_offset >> 17)];
for (var i = 0; i < num_files; i++)
{
var node = new file_descriptor();
node.filename_hash = filestream.ReadUInt32BE();
node.type = (byte)filestream.ReadByte();
node.offset = filestream.ReadUInt24BE();
nodes.Add(node.filename_hash, node);
}
foreach (file_descriptor node in nodes.Values)
{
filestream.Position = node.offset;
long offset = filestream.ReadUInt32BE();
node.data_offset = (offset << 10) + base_offset;
node.size = filestream.ReadUInt32BE();
}
root = RecursivelyGetFiles(null, ROOT_DIR, base_offset, "", nodes);
}