public override void WriteClusters(long startVcn, int count, byte[] buffer, int offset)
{
if (buffer.Length < (count * _bytesPerCluster) + offset)
{
throw new ArgumentException("Cluster buffer too small", "buffer");
}
int runIdx = 0;
int totalWritten = 0;
while (totalWritten < count)
{
long focusVcn = startVcn + totalWritten;
runIdx = _cookedRuns.FindDataRun(focusVcn, runIdx);
CookedDataRun run = _cookedRuns[runIdx];
if (run.IsSparse)
{
throw new NotImplementedException("Writing to sparse datarun");
}
int toWrite = (int)Math.Min(count - totalWritten, run.Length - (focusVcn - run.StartVcn));
long lcn = _cookedRuns[runIdx].StartLcn + (focusVcn - run.StartVcn);
_fsStream.Position = lcn * _bytesPerCluster;
_fsStream.Write(buffer, offset + (totalWritten * _bytesPerCluster), toWrite * _bytesPerCluster);
totalWritten += toWrite;
}
}
public int FindDataRun(long vcn, int startIdx)
{
int numRuns = _runs.Count;
if (numRuns > 0)
{
CookedDataRun run = _runs[numRuns - 1];
if (vcn >= run.StartVcn)
{
if (run.StartVcn + run.Length > vcn)
{
return(numRuns - 1);
}
else
{
throw new IOException("Looking for VCN outside of data runs");
}
}
for (int i = startIdx; i < numRuns; ++i)
{
run = _runs[i];
if (run.StartVcn + run.Length > vcn)
{
return(i);
}
}
}
throw new IOException("Looking for VCN outside of data runs");
}
public void MakeSparse(int index)
{
if (index < _firstDirty)
{
_firstDirty = index;
}
if (index > _lastDirty)
{
_lastDirty = index;
}
long prevLcn = index == 0 ? 0 : _runs[index - 1].StartLcn;
CookedDataRun run = _runs[index];
if (run.IsSparse)
{
throw new ArgumentException("Run is already sparse", "index");
}
_runs[index] = new CookedDataRun(new DataRun(0, run.Length, true), run.StartVcn, prevLcn, run.AttributeExtent);
run.AttributeExtent.ReplaceRun(run.DataRun, _runs[index].DataRun);
for (int i = index + 1; i < _runs.Count; ++i)
{
if (!_runs[i].IsSparse)
{
_runs[i].DataRun.RunOffset += run.StartLcn - prevLcn;
break;
}
}
}
public void MakeNonSparse(int index, IEnumerable <DataRun> rawRuns)
{
if (index < _firstDirty)
{
_firstDirty = index;
}
if (index > _lastDirty)
{
_lastDirty = index;
}
long prevLcn = index == 0 ? 0 : _runs[index - 1].StartLcn;
CookedDataRun run = _runs[index];
if (!run.IsSparse)
{
throw new ArgumentException("Run is already non-sparse", "index");
}
_runs.RemoveAt(index);
int insertIdx = run.AttributeExtent.RemoveRun(run.DataRun);
CookedDataRun lastNewRun = null;
long lcn = prevLcn;
long vcn = run.StartVcn;
foreach (var rawRun in rawRuns)
{
CookedDataRun newRun = new CookedDataRun(rawRun, vcn, lcn, run.AttributeExtent);
_runs.Insert(index, newRun);
run.AttributeExtent.InsertRun(insertIdx, rawRun);
vcn += rawRun.RunLength;
lcn += rawRun.RunOffset;
lastNewRun = newRun;
insertIdx++;
index++;
}
for (int i = index; i < _runs.Count; ++i)
{
if (_runs[i].IsSparse)
{
_runs[i].StartLcn = lastNewRun.StartLcn;
}
else
{
_runs[i].DataRun.RunOffset = _runs[i].StartLcn - lastNewRun.StartLcn;
break;
}
}
}
public bool AreAllClustersStored(long vcn, int count)
{
int runIdx = 0;
long focusVcn = vcn;
while (focusVcn < vcn + count)
{
runIdx = _cookedRuns.FindDataRun(focusVcn, runIdx);
CookedDataRun run = _cookedRuns[runIdx];
if (run.IsSparse)
{
return(false);
}
focusVcn = run.StartVcn + run.Length;
}
return(true);
}
public void SplitRun(int runIdx, long vcn)
{
if (runIdx < _firstDirty)
{
_firstDirty = runIdx;
}
if (runIdx > _lastDirty)
{
_lastDirty = runIdx;
}
CookedDataRun run = _runs[runIdx];
if (run.StartVcn >= vcn || run.StartVcn + run.Length <= vcn)
{
throw new ArgumentException("Attempt to split run outside of it's range", "vcn");
}
long distance = vcn - run.StartVcn;
long offset = run.IsSparse ? 0 : distance;
CookedDataRun newRun = new CookedDataRun(new DataRun(offset, run.Length - distance, run.IsSparse), vcn, run.StartLcn, run.AttributeExtent);
run.Length = distance;
_runs.Insert(runIdx + 1, newRun);
run.AttributeExtent.InsertRun(run.DataRun, newRun.DataRun);
for (int i = runIdx + 2; i < _runs.Count; ++i)
{
if (_runs[i].IsSparse)
{
_runs[i].StartLcn += offset;
}
else
{
_runs[i].DataRun.RunOffset -= offset;
break;
}
}
}
public void ReleaseClusters(long startVcn, int count)
{
int runIdx = 0;
long focus = startVcn;
while (focus < startVcn + count)
{
runIdx = _cookedRuns.FindDataRun(focus, runIdx);
CookedDataRun run = _cookedRuns[runIdx];
if (run.IsSparse)
{
focus += run.Length;
}
else
{
if (focus != run.StartVcn)
{
_cookedRuns.SplitRun(runIdx, focus);
runIdx++;
run = _cookedRuns[runIdx];
}
long numClusters = Math.Min((startVcn + count) - focus, run.Length);
if (numClusters != run.Length)
{
_cookedRuns.SplitRun(runIdx, focus + numClusters);
run = _cookedRuns[runIdx];
}
_context.ClusterBitmap.FreeClusters(new Range <long, long>(run.StartLcn, run.Length));
_cookedRuns.MakeSparse(runIdx);
focus += numClusters;
}
}
}
public override void ReadClusters(long startVcn, int count, byte[] buffer, int offset)
{
if (buffer.Length < (count * _bytesPerCluster) + offset)
{
throw new ArgumentException("Cluster buffer too small", "buffer");
}
int runIdx = 0;
int totalRead = 0;
while (totalRead < count)
{
long focusVcn = startVcn + totalRead;
runIdx = _cookedRuns.FindDataRun(focusVcn, runIdx);
CookedDataRun run = _cookedRuns[runIdx];
int toRead = (int)Math.Min(count - totalRead, run.Length - (focusVcn - run.StartVcn));
if (run.IsSparse)
{
Array.Clear(buffer, offset + (totalRead * _bytesPerCluster), toRead * _bytesPerCluster);
}
else
{
long lcn = _cookedRuns[runIdx].StartLcn + (focusVcn - run.StartVcn);
_fsStream.Position = lcn * _bytesPerCluster;
int numRead = Utilities.ReadFully(_fsStream, buffer, offset + (totalRead * _bytesPerCluster), toRead * _bytesPerCluster);
if (numRead != toRead * _bytesPerCluster)
{
throw new IOException(string.Format(CultureInfo.InvariantCulture, "Short read, reading {0} clusters starting at LCN {1}", toRead, lcn));
}
}
totalRead += toRead;
}
}
public void AllocateClusters(long startVcn, int count)
{
if (startVcn + count > _cookedRuns.NextVirtualCluster)
{
throw new IOException("Attempt to allocate unknown clusters");
}
int runIdx = 0;
long focus = startVcn;
while (focus < startVcn + count)
{
runIdx = _cookedRuns.FindDataRun(focus, runIdx);
CookedDataRun run = _cookedRuns[runIdx];
if (run.IsSparse)
{
if (focus != run.StartVcn)
{
_cookedRuns.SplitRun(runIdx, focus);
runIdx++;
run = _cookedRuns[runIdx];
}
long numClusters = Math.Min((startVcn + count) - focus, run.Length);
if (numClusters != run.Length)
{
_cookedRuns.SplitRun(runIdx, focus + numClusters);
run = _cookedRuns[runIdx];
}
long nextCluster = -1;
for (int i = runIdx - 1; i >= 0; --i)
{
if (!_cookedRuns[i].IsSparse)
{
nextCluster = _cookedRuns[i].StartLcn + _cookedRuns[i].Length;
break;
}
}
var alloced = _context.ClusterBitmap.AllocateClusters(numClusters, nextCluster, _isMft, AllocatedClusterCount);
List <DataRun> runs = new List <DataRun>();
long lcn = runIdx == 0 ? 0 : _cookedRuns[runIdx - 1].StartLcn;
foreach (var allocation in alloced)
{
runs.Add(new DataRun(allocation.First - lcn, allocation.Second, false));
lcn = allocation.First;
}
_cookedRuns.MakeNonSparse(runIdx, runs);
focus += numClusters;
}
else
{
focus = run.StartVcn + run.Length;
}
}
}
public void Append(DataRun rawRun, NonResidentAttributeRecord attributeExtent)
{
CookedDataRun last = Last;
_runs.Add(new CookedDataRun(rawRun, NextVirtualCluster, last == null ? 0 : last.StartLcn, attributeExtent));
}