public FatDirectoryEntry CreateSub(Fat fat)
{
var chain = new ClusterChain(fat, false);
chain.SetChainLength(1);
var entry = FatDirectoryEntry.Create(true);
entry.SetStartCluster(chain.GetStartCluster());
var dir =
new ClusterChainDirectory(chain, false);
/* add "." entry */
var dot = FatDirectoryEntry.Create(true);
dot.SetShortName(ShortName.Dot);
dot.SetStartCluster(dir.GetStorageCluster());
CopyDateTimeFields(entry, dot);
dir.AddEntry(dot);
/* add ".." entry */
var dotDot = FatDirectoryEntry.Create(true);
dotDot.SetShortName(ShortName.DotDot);
dotDot.SetStartCluster(GetStorageCluster());
CopyDateTimeFields(entry, dotDot);
dir.AddEntry(dotDot);
dir.Flush();
return(entry);
}
/// <summary>
/// Sets the size (in bytes) of this file. Because
/// <see cref="Write(long, MemoryStream)"/> to the file will grow
/// it automatically if needed, this method is mainly usefull for truncating
/// a file.
/// </summary>
/// <param name="length">the new length of the file in bytes</param>
/// <exception cref="ReadOnlyException">ReadOnlyException if this file is read-only</exception>
/// <exception cref="IOException">IOException on error updating the file size</exception>
public void SetLength(long length)
{
CheckWritable();
if (GetLength() == length)
{
return;
}
UpdateTimeStamps(true);
chain.SetSize(length);
entry.SetStartCluster(chain.GetStartCluster());
entry.SetLength(length);
}
public static ClusterChainDirectory CreateRoot(Fat fat)
{
if (fat.GetFatType() != FatType.BaseFat32)
{
throw new ArgumentException(
"only FAT32 stores root directory in a cluster chain");
}
var bs = (Fat32BootSector)fat.GetBootSector();
var cc = new ClusterChain(fat, false);
cc.SetChainLength(1);
bs.SetRootDirFirstCluster(cc.GetStartCluster());
var result =
new ClusterChainDirectory(cc, true);
result.Flush();
return(result);
}
/// <summary>
/// Returns the first cluster of the chain that stores this directory for
/// non-root instances or 0 if this is the root directory.
/// </summary>
/// <returns>the first storage cluster of this directory</returns>
/// <seealso cref="AbstractDirectory.IsRoot"/>
protected override long GetStorageCluster()
{
return(IsRoot() ? 0 : Chain.GetStartCluster());
}
