public override HashValue ComputeHash(long offset, long length)
{
MeteringStream stream;
if (offset == 0 && length == -1 && !this.OperatingStream.CanSeek)
{
var retval = StandardFileHashingService.GetHashFromCache(this.OperatingNode, this.ServiceType.AlgorithmName);
if (retval != null)
{
return(retval.Value);
}
stream = new MeteringStream(this.OperatingStream);
return(new HashValue(this.hashAlgorithm.ComputeHash(stream), this.ServiceType.AlgorithmName, 0, Convert.ToInt32(stream.ReadMeter.Value)));
}
else
{
if (offset == 0 && length == this.OperatingNode.Length)
{
if (StandardFileHashingService.ConfigurationSection.Default.CanCacheHash(this.OperatingNode))
{
string s;
if ((s = Convert.ToString(this.OperatingNode.Attributes["extended:" + ServiceType.AlgorithmName])) != "")
{
return(new HashValue(TextConversion.FromHexString(s), this.ServiceType.AlgorithmName, 0, -1));
}
}
}
if (!this.OperatingStream.CanSeek)
{
throw new NotSupportedException("ComputeHash_StreamCannotSeek");
}
stream = new MeteringStream(new PartialStream(this.OperatingStream, offset, length));
return(new HashValue(this.hashAlgorithm.ComputeHash(stream), this.ServiceType.AlgorithmName, offset, Convert.ToInt64(stream.ReadMeter.Value)));
}
}
public override void DoRun()
{
IFile destinationTemp;
Stream destinationTempStream;
string sourceHash;
try
{
lock (this)
{
SetTransferState(TransferState.Preparing);
}
Action <IFile> transferAttributes = delegate(IFile dest)
{
using (dest.Attributes.AquireUpdateContext())
{
foreach (string s in this.serviceType.AttributesToTransfer)
{
dest.Attributes[s] = this.source.Attributes[s];
}
}
};
Stream sourceStream = null;
for (var i = 0; i < 4; i++)
{
try
{
sourceStream = this.OperatingNode.GetContent().GetInputStream(FileMode.Open, FileShare.Read);
break;
}
catch (NodeNotFoundException)
{
throw;
}
catch (Exception)
{
if (i == 3)
{
throw;
}
}
ProcessTaskStateRequest();
}
using (sourceStream)
{
var sourceHashingService = (IHashingService)this.OperatingNode.GetService(new StreamHashingServiceType(sourceStream, this.HashAlgorithmName));
// Compute the hash of the source file
SetTransferState(TransferState.Comparing);
ProcessTaskStateRequest();
sourceHash = sourceHashingService.ComputeHash().TextValue;
// Try to open the destination file
ProcessTaskStateRequest();
var destinationHashingService = (IHashingService)this.TargetNode.GetService(new FileHashingServiceType(this.HashAlgorithmName));
string destinationHash;
try
{
destinationHash = destinationHashingService.ComputeHash().TextValue;
}
catch (DirectoryNodeNotFoundException)
{
this.TargetNode.ParentDirectory.Create(true);
try
{
destinationHash = destinationHashingService.ComputeHash().TextValue;
}
catch (NodeNotFoundException)
{
destinationHash = null;
}
}
catch (NodeNotFoundException)
{
destinationHash = null;
}
ProcessTaskStateRequest();
// Source and destination are identical
if (sourceHash == destinationHash)
{
SetTransferState(TransferState.Transferring);
this.progress.RaiseValueChanged(0, GetBytesToTransfer());
SetTransferState(TransferState.Tidying);
// Transfer attributes
try
{
transferAttributes((IFile)this.TargetNode);
}
catch (FileNotFoundException)
{
}
// Done
SetTransferState(TransferState.Finished);
ProcessTaskStateRequest();
return;
}
// Get a temp file for the destination based on the source's hash
destinationTemp = ((ITempIdentityFileService)this.destination.GetService(new TempIdentityFileServiceType(sourceHash))).GetTempFile();
// Get the stream for the destination temp file
try
{
if (!destinationTemp.ParentDirectory.Exists)
{
destinationTemp.ParentDirectory.Create(true);
}
}
catch (IOException)
{
}
using (destinationTempStream = destinationTemp.GetContent().OpenStream(FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
Action finishUp = delegate
{
SetTransferState(TransferState.Tidying);
destinationTempStream.Close();
for (int i = 0; i < 4; i++)
{
try
{
// Save hash value
StandardFileHashingService.SaveHashToCache((IFile)destinationTemp, this.HashAlgorithmName,
sourceHash, (IFile)this.TargetNode);
try
{
// Transfer attributes
transferAttributes(destinationTemp);
}
catch (FileNotFoundException e)
{
Console.WriteLine(e);
}
// Move destination temp to destination
destinationTemp.MoveTo(this.TargetNode, true);
break;
}
catch (Exception)
{
if (i == 3)
{
throw;
}
}
ProcessTaskStateRequest();
}
// Done
SetTransferState(TransferState.Finished);
ProcessTaskStateRequest();
};
// Get the hash for the destination temp file
var destinationTempHashingService = (IHashingService)destinationTemp.GetService(new StreamHashingServiceType(destinationTempStream));
// If the destination temp and the source aren't the same
// then complete the destination temp
string destinationTempHash;
if (destinationTempStream.Length >= sourceStream.Length)
{
// Destination is longer than source but starts source (unlikely)
destinationTempHash = destinationTempHashingService.ComputeHash(0, sourceStream.Length).TextValue;
if (destinationTempHash == sourceHash)
{
if (destinationTempStream.Length != sourceStream.Length)
{
destinationTempStream.SetLength(sourceStream.Length);
}
finishUp();
return;
}
destinationTempStream.SetLength(0);
}
if (destinationTempStream.Length > 0)
{
destinationTempHash = destinationTempHashingService.ComputeHash().TextValue;
// Destination shorter than the source but is a partial copy of source
sourceHash = sourceHashingService.ComputeHash(0, destinationTempStream.Length).TextValue;
if (sourceHash == destinationTempHash)
{
this.offset = destinationTempStream.Length;
}
else
{
this.offset = 0;
destinationTempStream.SetLength(0);
}
}
else
{
this.offset = 0;
}
this.progress.RaiseValueChanged(0, this.offset);
// Transfer over the remaining part needed (or everything if offset is 0)
this.offset = destinationTempStream.Length;
Stream sourcePartialStream = new PartialStream(sourceStream, destinationTempStream.Length);
Stream destinationTempPartialStream = new PartialStream(destinationTempStream, destinationTempStream.Length);
this.copier =
new StreamCopier(new BufferedStream(sourcePartialStream, this.serviceType.BufferSize), destinationTempPartialStream,
false, false, this.serviceType.ChunkSize);
this.copier.TaskStateChanged += delegate(object sender, TaskEventArgs eventArgs)
{
if (eventArgs.TaskState == TaskState.Running ||
eventArgs.TaskState == TaskState.Paused ||
eventArgs.TaskState == TaskState.Stopped)
{
SetTaskState(eventArgs.TaskState);
}
};
SetTransferState(TransferState.Transferring);
ProcessTaskStateRequest();
this.copier.Run();
if (this.copier.TaskState == TaskState.Stopped)
{
throw new StopRequestedException();
}
finishUp();
}
}
}
catch (StopRequestedException)
{
}
finally
{
if (this.TransferState != TransferState.Finished)
{
SetTransferState(TransferState.Stopped);
}
}
}