public VfsXfsFileSystem(Stream stream, FileSystemParameters parameters)
: base(new XfsFileSystemOptions(parameters))
{
stream.Position = 0;
byte[] superblockData = Utilities.ReadFully(stream, 264);
SuperBlock superblock = new SuperBlock();
superblock.ReadFrom(superblockData, 0);
if (superblock.Magic != SuperBlock.XfsMagic)
{
throw new IOException("Invalid superblock magic - probably not an xfs file system");
}
Context = new Context
{
RawStream = stream,
SuperBlock = superblock,
Options = (XfsFileSystemOptions)Options
};
var allocationGroups = new AllocationGroup[superblock.AgCount];
long offset = 0;
for (int i = 0; i < allocationGroups.Length; i++)
{
var ag = new AllocationGroup(Context, offset);
allocationGroups[ag.InodeBtreeInfo.SequenceNumber] = ag;
offset += ag.FreeBlockInfo.Length * superblock.Blocksize;
}
Context.AllocationGroups = allocationGroups;
RootDirectory = new Directory(Context, Context.GetInode(superblock.RootInode));
}
internal static bool Detect(Stream stream)
{
if (stream.Length < 264)
{
return(false);
}
stream.Position = 0;
byte[] superblockData = StreamUtilities.ReadFully(stream, 264);
SuperBlock superblock = new SuperBlock();
superblock.ReadFrom(superblockData, 0);
return(superblock.Magic == SuperBlock.XfsMagic);
}