public CFileBlockRequest(MemoryStream buffer,byte[] FileHash,ref CFileBlock block1,ref CFileBlock block2,ref CFileBlock block3)
{
BinaryWriter writer=new BinaryWriter(buffer);
DonkeyHeader header=new DonkeyHeader((byte)Protocol.ClientCommand.RequestParts,writer);
writer.Write(FileHash);
writer.Write(block1.start);
writer.Write(block2.start);
writer.Write(block3.start);
writer.Write(block1.end+1);
writer.Write(block2.end+1);
writer.Write(block3.end+1);
header.Packetlength=(uint)writer.BaseStream.Length-header.Packetlength+1;
writer.Seek(0,SeekOrigin.Begin);
header.Serialize(writer);
}
public void RequestBlocks()
{
#if VERBOSE
CKernel.LogClient.AddLog("RequestBlocks,download blocks.count:"+Convert.ToString(m_DownloadBlocks.Count),m_ID);
#endif
if (m_DownloadElement==null)
{
if (DownFileHash!=null)
{
m_DownloadElement=(CElement)CKernel.FilesList[DownFileHash];
if ((m_DownloadElement!=null)&&(m_DownloadElement.SourcesList!=null))
{
m_DownloadElement.SourcesList.AddSource(this);
}
else
{
// probablemente el fichero ya se ha completado
return;
}
}
else
{
return;
}
}
m_DownloadState=Protocol.DownloadState.Downloading;
//CElement Element=(CElement)CKernel.FilesList[CKernel.HashToString(DownFileHash)];
uint start=0;
uint end=0;
int chunk=0;
CFileBlock[] blocks=new CFileBlock[3];
for (uint i=0;i!=3;i++)
{
blocks[i]=new CFileBlock();
//Debug.Write("LastChunk:"+m_LastChunkRequested.ToString());
chunk=m_DownloadElement.SourcesList.SelectChunk(m_DownFileChunks,m_LastChunkRequested);
m_LastChunkRequested=chunk;
//Debug.WriteLine("NewChunk:"+m_LastChunkRequested.ToString());
if (chunk>=0)
{
if (m_DownloadElement.File.GetNewBlockInChunk((uint)chunk,ref start,ref end))
{
blocks[i].start=start;
blocks[i].end=end;
blocks[i].FileHash=DownFileHash;
blocks[i].position=start;
//blocks[i].buffer=new Byte[fin+1-inicio];
m_DownloadBlocks.Add(blocks[i]);
if ((end==0)&&(start==0))
{
Debug.WriteLine("no more blocks to request "+Convert.ToString(chunk));
}
else
{
//Debug.WriteLine(m_UserName+", ChunksStatus = "+Convert.ToString(m_DownloadElement.File.ChunksStatus[0])/*+Convert.ToString(m_DownloadElement.File.GetChunksStatus()[1])*/);
#if VERBOSE
CKernel.LogClient.AddLog("RequestBlocks-chunk requested "+Convert.ToString(chunk)+" block: "+Convert.ToString(start)+"-"+Convert.ToString(end)+"\n",m_ID);
#endif
}
}
}
}
if ((blocks[0].start==0)&&(blocks[0].end==0))
{
#if VERBOSE
CKernel.LogClient.AddLog("RequestBlocks-first block is null,no request blocks",m_ID);
#endif
#if DEBUG
Debug.WriteLine(m_UserName+" Parte: "+Convert.ToString(chunk)+" first block is null,no request blocks");
for (int j=0;j<m_DownloadElement.File.ChunksStatus.Length;j++)
{
if (((m_DownloadElement.File.ChunksStatus[j]==(byte)Protocol.ChunkState.Empty)||
(m_DownloadElement.File.ChunksStatus[j]==(byte)Protocol.ChunkState.InProgress))&&
(m_DownFileChunks[j]==(byte)Protocol.ChunkState.Complete))
Debug.WriteLine("Chunk not selected when available");
}
#endif
if (m_DownloadBlocks.Count==0)
{
//no needed new blocks to download and nothing pending for receiving
bool willBeChangedToOtherFile=((m_OtherDownFiles!=null)&&(m_OtherDownFiles.Count>0));
CancelDownloadTransfer(false);
if (!willBeChangedToOtherFile)
{
m_DownloadState=Protocol.DownloadState.NoNeededParts;
}
}
}
else
{
MemoryStream packet=new MemoryStream();
CFileBlockRequest fileBlockRequest=new CFileBlockRequest(packet,DownFileHash,ref blocks[0],ref blocks[1],ref blocks[2]);
if (connection!=null)
{
connection.SendPacket(packet);
}
}
}
public CFileBlockRequest(MemoryStream buffer)
{
byte[] FileHash;
if (buffer.Length!=40) return;
CFileBlock block1=new CFileBlock();
CFileBlock block2=new CFileBlock();
CFileBlock block3=new CFileBlock();
RequestedBlocks=new ArrayList();
BinaryReader reader=new BinaryReader(buffer);
//FileHash=new Byte[16];
FileHash=reader.ReadBytes(16);
block1.start=reader.ReadUInt32();
block2.start=reader.ReadUInt32();
block3.start=reader.ReadUInt32();
block1.end=reader.ReadUInt32();
block2.end=reader.ReadUInt32();
block3.end=reader.ReadUInt32();
block1.FileHash=FileHash;
block2.FileHash=FileHash;
block3.FileHash=FileHash;
if (block1.end>block1.start) RequestedBlocks.Add(block1);
if (block2.end>block2.start) RequestedBlocks.Add(block2);
if (block3.end>block3.start) RequestedBlocks.Add(block3);
reader.Close();
buffer.Close();
reader=null;
buffer=null;
}