Dictionary <string, DirectoryEntryWithPointers> DecodeDirectory(int firstBlock)
{
Dictionary <string, DirectoryEntryWithPointers> entries =
new Dictionary <string, DirectoryEntryWithPointers>();
int nextBlock = firstBlock;
DirectoryHeader header;
do
{
byte[] data = _image.ReadSectors((ulong)(nextBlock * _volumeBlockSizeRatio), _volumeBlockSizeRatio);
header = Marshal.ByteArrayToStructureBigEndian <DirectoryHeader>(data);
nextBlock = header.next_block + firstBlock;
int off = (int)header.first_used;
var entry = new DirectoryEntry();
while (off + _directoryEntrySize < data.Length)
{
entry = Marshal.ByteArrayToStructureBigEndian <DirectoryEntry>(data, off, _directoryEntrySize);
string name = StringHandlers.CToString(entry.name, Encoding);
var entryWithPointers = new DirectoryEntryWithPointers
{
entry = entry,
pointers = new uint[entry.last_copy + 1]
};
for (int i = 0; i <= entry.last_copy; i++)
{
entryWithPointers.pointers[i] =
BigEndianBitConverter.ToUInt32(data, off + _directoryEntrySize + (i * 4));
}
entries.Add(name, entryWithPointers);
if ((entry.flags & (uint)FileFlags.LastEntry) != 0 ||
(entry.flags & (uint)FileFlags.LastEntryInBlock) != 0)
{
break;
}
off += (int)(_directoryEntrySize + ((entry.last_copy + 1) * 4));
}
if ((entry.flags & (uint)FileFlags.LastEntry) != 0)
{
break;
}
} while(header.next_block != -1);
return(entries);
}
Errno GetFileEntry(string path, out DirectoryEntryWithPointers entry)
{
entry = null;
string cutPath = path.StartsWith("/", StringComparison.Ordinal)
? path.Substring(1).ToLower(CultureInfo.CurrentUICulture)
: path.ToLower(CultureInfo.CurrentUICulture);
string[] pieces = cutPath.Split(new[]
{
'/'
}, StringSplitOptions.RemoveEmptyEntries);
if (pieces.Length == 0)
{
return(Errno.InvalidArgument);
}
string parentPath = string.Join("/", pieces, 0, pieces.Length - 1);
if (!_directoryCache.TryGetValue(parentPath, out _))
{
Errno err = ReadDir(parentPath, out _);
if (err != Errno.NoError)
{
return(err);
}
}
Dictionary <string, DirectoryEntryWithPointers> parent;
if (pieces.Length == 1)
{
parent = _rootDirectoryCache;
}
else if (!_directoryCache.TryGetValue(parentPath, out parent))
{
return(Errno.InvalidArgument);
}
KeyValuePair <string, DirectoryEntryWithPointers> dirent =
parent.FirstOrDefault(t => t.Key.ToLower(CultureInfo.CurrentUICulture) == pieces[^ 1]);
if (string.IsNullOrEmpty(dirent.Key))
{
return(Errno.NoSuchFile);
}
entry = dirent.Value;
return(Errno.NoError);
}
