public override void Reset()
{
foreach (var entry in _children)
{
entry.Node.Reset();
}
_inode = new DirectoryInode();
}
public VfsSquashFileSystemReader(Stream stream)
: base(new DiscFileSystemOptions())
{
_context = new Context();
_context.SuperBlock = new SuperBlock();
_context.RawStream = stream;
// Read superblock
stream.Position = 0;
byte[] buffer = Utilities.ReadFully(stream, _context.SuperBlock.Size);
_context.SuperBlock.ReadFrom(buffer, 0);
if (_context.SuperBlock.Magic != SuperBlock.SquashFsMagic)
{
throw new IOException("Invalid SquashFS filesystem - magic mismatch");
}
if (_context.SuperBlock.Compression != 1)
{
throw new IOException("Unsupported compression used");
}
if (_context.SuperBlock.ExtendedAttrsTableStart != -1)
{
throw new IOException("Unsupported extended attributes present");
}
if (_context.SuperBlock.MajorVersion != 4)
{
throw new IOException("Unsupported file system version: " + _context.SuperBlock.MajorVersion + "." + _context.SuperBlock.MinorVersion);
}
// Create block caches, used to reduce the amount of I/O and decompression activity.
_blockCache = new BlockCache <Block>((int)_context.SuperBlock.BlockSize, 20);
_metablockCache = new BlockCache <Metablock>(MetadataBufferSize, 20);
_context.ReadBlock = ReadBlock;
_context.ReadMetaBlock = ReadMetaBlock;
_context.InodeReader = new MetablockReader(_context, _context.SuperBlock.InodeTableStart);
_context.DirectoryReader = new MetablockReader(_context, _context.SuperBlock.DirectoryTableStart);
if (_context.SuperBlock.FragmentTableStart != -1)
{
_context.FragmentTableReaders = LoadIndirectReaders(
_context.SuperBlock.FragmentTableStart,
(int)_context.SuperBlock.FragmentsCount,
FragmentRecord.RecordSize);
}
if (_context.SuperBlock.UidGidTableStart != -1)
{
_context.UidGidTableReaders = LoadIndirectReaders(
_context.SuperBlock.UidGidTableStart,
_context.SuperBlock.UidGidCount,
4);
}
// Bootstrap the root directory
_context.InodeReader.SetPosition(_context.SuperBlock.RootInode);
DirectoryInode dirInode = (DirectoryInode)Inode.Read(_context.InodeReader);
RootDirectory = new Directory(_context, dirInode, _context.SuperBlock.RootInode);
}
