public static DirectoryRecord ReadFrom(MetablockReader reader)
{
DirectoryRecord result = new DirectoryRecord();
result.Offset = reader.ReadUShort();
result.InodeNumber = reader.ReadShort();
result.Type = (InodeType)reader.ReadUShort();
ushort size = reader.ReadUShort();
result.Name = reader.ReadString(size + 1);
return(result);
}
public DirectoryEntry(DirectoryHeader header, DirectoryRecord record)
{
_header = header;
_record = record;
}
private void WriteDirectory(BuilderContext context)
{
MetadataRef startPos = context.DirectoryWriter.Position;
int currentChild = 0;
int numDirs = 0;
while (currentChild < _children.Count)
{
long thisBlock = _children[currentChild].Node.InodeRef.Block;
int firstInode = _children[currentChild].Node.InodeNumber;
int count = 1;
while (currentChild + count < _children.Count &&
_children[currentChild + count].Node.InodeRef.Block == thisBlock &&
_children[currentChild + count].Node.InodeNumber - firstInode < 0x7FFF)
{
++count;
}
DirectoryHeader hdr = new DirectoryHeader()
{
Count = count - 1,
InodeNumber = firstInode,
StartBlock = (int)thisBlock
};
hdr.WriteTo(context.IoBuffer, 0);
context.DirectoryWriter.Write(context.IoBuffer, 0, hdr.Size);
for (int i = 0; i < count; ++i)
{
Entry child = _children[currentChild + i];
DirectoryRecord record = new DirectoryRecord()
{
Offset = (ushort)child.Node.InodeRef.Offset,
InodeNumber = (short)(child.Node.InodeNumber - firstInode),
Type = child.Node.Inode.Type,
Name = child.Name
};
record.WriteTo(context.IoBuffer, 0);
context.DirectoryWriter.Write(context.IoBuffer, 0, record.Size);
if (child.Node.Inode.Type == InodeType.Directory ||
child.Node.Inode.Type == InodeType.ExtendedDirectory)
{
++numDirs;
}
}
currentChild += count;
}
long size = context.DirectoryWriter.DistanceFrom(startPos);
if (size > uint.MaxValue)
{
throw new NotImplementedException("Writing large directories");
}
NumLinks = numDirs + 2; // +1 for self, +1 for parent
_inode.StartBlock = (uint)startPos.Block;
_inode.Offset = (ushort)startPos.Offset;
_inode.FileSize = (uint)size + 3; // For some reason, always +3
}