public static DirectoryHeader ReadFrom(MetablockReader reader)
{
DirectoryHeader result = new DirectoryHeader();
result.Count = reader.ReadInt();
result.StartBlock = reader.ReadInt();
result.InodeNumber = reader.ReadInt();
return(result);
}
private int GetId(ushort idKey)
{
int recordsPerBlock = MetadataBufferSize / 4;
int block = idKey / recordsPerBlock;
int offset = idKey % recordsPerBlock;
MetablockReader reader = _context.UidGidTableReaders[block];
reader.SetPosition(0, offset * 4);
return(reader.ReadInt());
}
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);
}
private MetablockReader[] LoadIndirectReaders(long pos, int count, int recordSize)
{
_context.RawStream.Position = pos;
int numBlocks = (int)Utilities.Ceil(count * recordSize, MetadataBufferSize);
byte[] tableBytes = Utilities.ReadFully(_context.RawStream, numBlocks * 8);
MetablockReader[] result = new MetablockReader[numBlocks];
for (int i = 0; i < numBlocks; ++i)
{
long block = Utilities.ToInt64LittleEndian(tableBytes, i * 8);
result[i] = new MetablockReader(_context, block);
}
return(result);
}
public static Inode Read(MetablockReader inodeReader)
{
byte[] typeData = new byte[2];
if (inodeReader.Read(typeData, 0, 2) != 2)
{
throw new IOException("Unable to read Inode type");
}
InodeType type = (InodeType)Utilities.ToUInt16LittleEndian(typeData, 0);
Inode inode = InstantiateType(type);
byte[] inodeData = new byte[inode.Size];
inodeData[0] = typeData[0];
inodeData[1] = typeData[1];
if (inodeReader.Read(inodeData, 2, inode.Size - 2) != inode.Size - 2)
{
throw new IOException("Unable to read whole Inode");
}
inode.ReadFrom(inodeData, 0);
return(inode);
}