private void PageOftBuffer(OftEntry entry, Descriptor descriptor, int newBlockIndex)
{
if(entry.FileBlock != -1)
disk.WriteBlock(descriptor.DiskMap[entry.FileBlock], entry.Buffer);
disk.ReadBlock(descriptor.DiskMap[entry.FileBlock = newBlockIndex], entry.Buffer);
}
/// <summary>
/// Resets the file system's state to its initial value.
/// </summary>
public void Init()
{
disk = new Disk(BlockCount, BlockSize);
oft = new OftEntry[MaxOpenFiles];
for (int i = 0; i < MaxOpenFiles; i++)
oft[i] = new OftEntry();
// Mark the blocks needed for the bitmap and
// the file descriptors as reserved.
for (int i = 0; i < BitmapBlockCount + DescriptorBlockCount; i++)
SetBitmapBit(i, true);
// Initialize all descriptors to blank.
var descriptor = new Descriptor();
for (int i = 1; i < DescriptorCount; i++)
WriteDescriptor(i, descriptor);
// Initialize the directory descriptor.
descriptor.Length = 0;
WriteDescriptor(0, descriptor);
// Initialize directory's oft entry.
var oftDir = oft[0];
oftDir.DescriptorIndex = 0;
// Initialize the directory file.
var dirEntry = new DirEntry();
for (int i = 1; i < DirectoryEntryCount; i++)
WriteDirEntry(i, dirEntry);
// Create the directory entry which describes the
// directory itself.
dirEntry.DescriptorIndex = 0;
dirEntry.Name[0] = (byte)'d';
dirEntry.Name[1] = (byte)'i';
dirEntry.Name[2] = (byte)'r';
WriteDirEntry(0, dirEntry);
var dirDesc = ReadDescriptor(0);
}
