public ClusterChain(Fat fat, long startCluster, bool readOnly) : base(readOnly)
{
this.fat = fat;
if (startCluster != 0)
{
this.fat.TestCluster(startCluster);
if (this.fat.IsFreeCluster(startCluster))
{
throw new ArgumentException(
"cluster " + startCluster + " is free");
}
}
device = fat.GetDevice();
dataOffset = FatUtils.GetFilesOffset(fat.GetBootSector());
this.startCluster = startCluster;
clusterSize = fat.GetBootSector().GetBytesPerCluster();
}
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);
}