public SharedFileInfo(Stream s)
{
BincodingDecoder decoder = new BincodingDecoder(s, "FI");
while (true)
{
Bincoding value = decoder.DecodeNext();
if (value.Type == BincodingType.NULL)
{
break;
}
KeyValuePair <string, Bincoding> pair = value.GetKeyValuePair();
switch (pair.Key)
{
case "file_path":
_filePath = pair.Value.GetStringValue();
break;
case "file_metadata":
_fileMetaData = new SharedFileMetaData(pair.Value.GetValueStream());
break;
case "state":
_state = (SharedFileState)pair.Value.GetByteValue();
break;
case "block_available":
_blockAvailable = pair.Value.Value;
break;
}
}
}
public SharedFileInfo(string filePath, SharedFileMetaData fileMetaData, byte[] blockAvailable, SharedFileState state)
{
_filePath = filePath;
_fileMetaData = fileMetaData;
_blockAvailable = blockAvailable;
_state = state;
}
public void Pause()
{
if (_state != SharedFileState.Paused)
{
_state = SharedFileState.Paused;
Stop();
//announce no participation in chats
SendFileShareUnparticipate();
}
}
private void StartSharing()
{
if (_state != SharedFileState.Sharing)
{
_state = SharedFileState.Sharing;
//send advertisement
SendFileAdvertisement();
//start file transfer speed calculator
_fileTransferSpeedCalculator = new Timer(FileTransferSpeedCalculatorAsync, null, 1000, 1000);
}
}
private void OnDownloadComplete()
{
//verify if all blocks are available
for (int i = 0; i < _blockAvailable.Length; i++)
{
if (_blockAvailable[i] == FILE_BLOCK_NOT_AVAILABLE)
{
return; //found a pending block; do nothing
}
}
//set variables
_isComplete = true;
_state = SharedFileState.Sharing;
_availableBlocksCount = _blockAvailable.Length;
//rename and open file again in read shared mode
string filePath = _fileStream.Name;
_fileStream.Close();
File.SetLastWriteTimeUtc(filePath, _metaData.LastModified);
string newFilePath = Path.Combine(Path.GetDirectoryName(filePath), Path.GetFileNameWithoutExtension(filePath));
File.Move(filePath, newFilePath);
_fileStream = new FileStream(newFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
//remove seeders
_seedersLock.EnterWriteLock();
try
{
_seeders.Clear();
}
finally
{
_seedersLock.ExitWriteLock();
}
//announce advertisement for the complete file to all chats available with same file
SendBroadcastFileAdvertisement();
//notify event to UI
if (FileDownloaded != null)
{
RaiseEventFileDownloaded();
}
}
public void Pause()
{
if (_state != SharedFileState.Paused)
{
_state = SharedFileState.Paused;
Stop();
//announce no participation in chats
SendBroadcastFileShareUnparticipate();
if (FilePaused != null)
{
RaiseEventFilePaused();
}
}
}
private void StartDownload()
{
if (_state != SharedFileState.Downloading)
{
_state = SharedFileState.Downloading;
//get file
if (_fileStream == null)
{
BitChatProfile profile;
lock (_chats)
{
profile = _chats[0].Profile;
}
//find file name
string filePath = Path.Combine(profile.DownloadFolder, _metaData.FileName);
int nameCount = 0;
while (File.Exists(filePath))
{
if (nameCount > 10000)
{
throw new BitChatException("Cannot download file as local file name not available.");
}
nameCount++;
filePath = Path.Combine(profile.DownloadFolder, Path.GetFileNameWithoutExtension(_metaData.FileName) + " [" + nameCount + "]" + Path.GetExtension(_metaData.FileName));
}
//create file
_fileStream = new FileStream(filePath + ".downloading", FileMode.Create, FileAccess.ReadWrite);
//pre-allocate file
_fileStream.SetLength(_metaData.FileSize);
//init block available
_blockAvailable = new byte[_blockAvailable.Length];
_availableBlocksCount = 0;
}
//list all pending blocks
if (_pendingBlocks == null)
{
_pendingBlocks = new List <int>(_blockAvailable.Length);
_rndPendingBlock = new Random(DateTime.UtcNow.Second);
}
else
{
_pendingBlocks.Clear();
}
for (int i = 0; i < _blockAvailable.Length; i++)
{
if (_blockAvailable[i] == FILE_BLOCK_NOT_AVAILABLE)
{
_pendingBlocks.Add(i);
}
}
if (_pendingBlocks.Count > 0)
{
//announce file sharing participation in chats
SendBroadcastFileShareParticipate();
//start block download
int totalDownloaders = FILE_BLOCK_DOWNLOAD_THREADS;
if (_pendingBlocks.Count < totalDownloaders)
{
totalDownloaders = _pendingBlocks.Count;
}
_downloaders = new List <FileBlockDownloader>(totalDownloaders);
lock (_downloaders)
{
for (int i = 0; i < totalDownloaders; i++)
{
_downloaders.Add(new FileBlockDownloader(this));
}
}
//start file transfer speed calculator
_fileTransferSpeedCalculator = new Timer(FileTransferSpeedCalculatorAsync, null, 1000, 1000);
if (FileDownloadStarted != null)
{
RaiseEventFileDownloadStarted();
}
}
else
{
OnDownloadComplete();
}
}
}
internal static SharedFile LoadFile(string filePath, SharedFileMetaData metaData, byte[] blockAvailable, SharedFileState state, SynchronizationContext syncCxt)
{
//check if file already shared
lock (_sharedFiles)
{
SharedFile sharedFile;
if (_sharedFiles.ContainsKey(metaData.FileID))
{
sharedFile = _sharedFiles[metaData.FileID];
}
else
{
if (state == SharedFileState.Advertisement)
{
sharedFile = new SharedFile(null, metaData, new byte[metaData.BlockHash.Length], 0, syncCxt);
_sharedFiles.Add(metaData.FileID, sharedFile);
sharedFile._state = SharedFileState.Advertisement;
}
else
{
int availableBlocksCount = 0;
for (int i = 0; i < blockAvailable.Length; i++)
{
if (blockAvailable[i] == FILE_BLOCK_AVAILABLE)
{
availableBlocksCount++;
}
}
FileStream fS;
if (blockAvailable.Length == availableBlocksCount)
{
fS = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
}
else
{
fS = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
}
sharedFile = new SharedFile(fS, metaData, blockAvailable, availableBlocksCount, syncCxt);
_sharedFiles.Add(metaData.FileID, sharedFile);
sharedFile._state = SharedFileState.Paused;
if (state != SharedFileState.Paused)
{
sharedFile.Start();
}
}
}
return(sharedFile);
}
}
private void OnBlockDownloaded(FileBlockDownloadManager downloadedBlock)
{
lock (_downloadingBlocks)
{
if (_downloadingBlocks.Remove(downloadedBlock))
{
if (WriteBlock(downloadedBlock))
{
//block downloaded
//Debug.Write("SharedFile.BlockDownloaded", "block: " + downloadedBlock.BlockNumber);
if (BlockDownloaded != null)
{
RaiseEventBlockDownloaded();
}
}
else
{
//block download fail/corrupt; add block again in pending list
lock (_pendingBlocks)
{
_pendingBlocks.Add(downloadedBlock.BlockNumber);
}
}
//start new block download
FileBlockDownloadManager newDownload = GetRandomDownloadBlock();
if (newDownload != null)
{
_downloadingBlocks.Add(newDownload);
}
if (_downloadingBlocks.Count == 0)
{
//download COMPLETED!
//set variables
_isComplete = true;
_state = SharedFileState.Sharing;
_availableBlocksCount = _blockAvailable.Length;
//stop download monitor
_downloadMonitor.Dispose();
_downloadMonitor = null;
//rename and open file again in read shared mode
string filePath = _fileStream.Name;
_fileStream.Close();
File.SetLastWriteTimeUtc(filePath, _metaData.LastModified);
string newFilePath = Path.Combine(Path.GetDirectoryName(filePath), Path.GetFileNameWithoutExtension(filePath));
File.Move(filePath, newFilePath);
_fileStream = new FileStream(newFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
//remove seeders
lock (_seeders)
{
_seeders.Clear();
}
//announce advertisement for the complete file to all chats available with same file
SendFileAdvertisement();
//notify event to UI
//Debug.Write("SharedFile.BlockDownloaded", "COMPLETED!");
if (FileDownloaded != null)
{
RaiseEventFileDownloaded();
}
}
}
}
}
private void StartDownload()
{
if (_state != SharedFileState.Downloading)
{
_state = SharedFileState.Downloading;
//get file
if (_fileStream == null)
{
//find file name
string filePath = Path.Combine(_profile.DownloadFolder, _metaData.FileName);
int nameCount = 0;
while (File.Exists(filePath))
{
if (nameCount > 10000)
{
throw new BitChatException("Cannot download file as local file name not available.");
}
nameCount++;
filePath = Path.Combine(_profile.DownloadFolder, Path.GetFileNameWithoutExtension(_metaData.FileName) + " [" + nameCount + "]" + Path.GetExtension(_metaData.FileName));
}
//create file
_fileStream = new FileStream(filePath + ".downloading", FileMode.Create, FileAccess.ReadWrite);
//pre-allocate file
_fileStream.SetLength(_metaData.FileSize);
//init block available
_blockAvailable = new FileBlockState[_blockAvailable.Length];
_availableBlocksCount = 0;
}
//list all pending blocks
if (_pendingBlocks == null)
{
_pendingBlocks = new List <int>(_blockAvailable.Length);
_rndPendingBlock = new Random(DateTime.UtcNow.Second);
for (int i = 0; i < _blockAvailable.Length; i++)
{
if (_blockAvailable[i] != FileBlockState.Available)
{
_pendingBlocks.Add(i);
}
}
}
//announce file sharing participation in chats
SendFileShareParticipate();
//start block download
_downloadingBlocks = new List <FileBlockDownloadManager>(TOTAL_DOWNLOAD_BLOCKS);
lock (_downloadingBlocks)
{
for (int i = 0; i < TOTAL_DOWNLOAD_BLOCKS; i++)
{
FileBlockDownloadManager download = GetRandomDownloadBlock();
if (download == null)
{
break;
}
_downloadingBlocks.Add(download);
}
}
//start file transfer speed calculator
_fileTransferSpeedCalculator = new Timer(FileTransferSpeedCalculatorAsync, null, 1000, 1000);
//start download monitor
_downloadMonitor = new Timer(DownloadMonitorAsync, null, DOWNLOAD_MONITOR_INTERVAL, Timeout.Infinite);
if (FileDownloadStarted != null)
{
RaiseEventFileDownloadStarted();
}
}
}
private void StartSharing()
{
if (_state != SharedFileState.Sharing)
{
_state = SharedFileState.Sharing;
//send advertisement
SendFileAdvertisement();
//start file transfer speed calculator
_fileTransferSpeedCalculator = new Timer(FileTransferSpeedCalculatorAsync, null, 1000, 1000);
}
}
private void StartDownload()
{
if (_state != SharedFileState.Downloading)
{
_state = SharedFileState.Downloading;
//get file
if (_fileStream == null)
{
//find file name
string filePath = Path.Combine(_profile.DownloadFolder, _metaData.FileName);
int nameCount = 0;
while (File.Exists(filePath))
{
if (nameCount > 10000)
throw new BitChatException("Cannot download file as local file name not available.");
nameCount++;
filePath = Path.Combine(_profile.DownloadFolder, Path.GetFileNameWithoutExtension(_metaData.FileName) + " [" + nameCount + "]" + Path.GetExtension(_metaData.FileName));
}
//create file
_fileStream = new FileStream(filePath + ".downloading", FileMode.Create, FileAccess.ReadWrite);
//pre-allocate file
_fileStream.SetLength(_metaData.FileSize);
//init block available
_blockAvailable = new FileBlockState[_blockAvailable.Length];
_availableBlocksCount = 0;
}
//list all pending blocks
if (_pendingBlocks == null)
{
_pendingBlocks = new List<int>(_blockAvailable.Length);
_rndPendingBlock = new Random(DateTime.UtcNow.Second);
for (int i = 0; i < _blockAvailable.Length; i++)
{
if (_blockAvailable[i] != FileBlockState.Available)
_pendingBlocks.Add(i);
}
}
//announce file sharing participation in chats
SendFileShareParticipate();
//start block download
_downloadingBlocks = new List<FileBlockDownloadManager>(TOTAL_DOWNLOAD_BLOCKS);
lock (_downloadingBlocks)
{
for (int i = 0; i < TOTAL_DOWNLOAD_BLOCKS; i++)
{
FileBlockDownloadManager download = GetRandomDownloadBlock();
if (download == null)
break;
_downloadingBlocks.Add(download);
}
}
//start file transfer speed calculator
_fileTransferSpeedCalculator = new Timer(FileTransferSpeedCalculatorAsync, null, 1000, 1000);
//start download monitor
_downloadMonitor = new Timer(DownloadMonitorAsync, null, DOWNLOAD_MONITOR_INTERVAL, Timeout.Infinite);
if (FileDownloadStarted != null)
RaiseEventFileDownloadStarted();
}
}
private void OnBlockDownloaded(FileBlockDownloadManager downloadedBlock)
{
lock (_downloadingBlocks)
{
if (_downloadingBlocks.Remove(downloadedBlock))
{
if (WriteBlock(downloadedBlock))
{
//block downloaded
//Debug.Write("SharedFile.BlockDownloaded", "block: " + downloadedBlock.BlockNumber);
if (BlockDownloaded != null)
RaiseEventBlockDownloaded();
}
else
{
//block download fail/corrupt; add block again in pending list
lock (_pendingBlocks)
{
_pendingBlocks.Add(downloadedBlock.BlockNumber);
}
}
//start new block download
FileBlockDownloadManager newDownload = GetRandomDownloadBlock();
if (newDownload != null)
_downloadingBlocks.Add(newDownload);
if (_downloadingBlocks.Count == 0)
{
//download COMPLETED!
//set variables
_isComplete = true;
_state = SharedFileState.Sharing;
_availableBlocksCount = _blockAvailable.Length;
//stop download monitor
_downloadMonitor.Dispose();
_downloadMonitor = null;
//rename and open file again in read shared mode
string filePath = _fileStream.Name;
_fileStream.Close();
File.SetLastWriteTimeUtc(filePath, _metaData.LastModified);
string newFilePath = Path.Combine(Path.GetDirectoryName(filePath), Path.GetFileNameWithoutExtension(filePath));
File.Move(filePath, newFilePath);
_fileStream = new FileStream(newFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
//remove seeders
lock (_seeders)
{
_seeders.Clear();
}
//announce advertisement for the complete file to all chats available with same file
SendFileAdvertisement();
//notify event to UI
//Debug.Write("SharedFile.BlockDownloaded", "COMPLETED!");
if (FileDownloaded != null)
RaiseEventFileDownloaded();
}
}
}
}
public void Pause()
{
if (_state != SharedFileState.Paused)
{
_state = SharedFileState.Paused;
Stop();
//announce no participation in chats
SendFileShareUnparticipate();
}
}
