/// <summary>
/// 删除同步文件
/// </summary>
/// <param name="fileIdentity">服务端返回下载文件信息</param>
private void removeCreate(DownloadFileIdentity fileIdentity)
{
server.Remove(Identity);
if (fileStream != null)
{
fileStream.Dispose();
}
onCreated(fileIdentity);
}
/// <summary>
/// 文件下载创建回调处理
/// </summary>
/// <param name="fileIdentity"></param>
private void onCreated(ReturnValue <DownloadFileIdentity> fileIdentity)
{
SynchronousState state = SynchronousState.Unknown;
try
{
if (fileIdentity.Type == ReturnType.Success)
{
if (fileIdentity.Value != null)
{
this.fileIdentity = fileIdentity.Value;
if (this.fileIdentity.Tick == 0)
{
state = this.fileIdentity.GetErrorState();
if (state == SynchronousState.Success)
{
state = SynchronousState.Unknown;
byte[] data = this.fileIdentity.Data;
if (data == null)
{
if (this.fileIdentity.ListFileItem.Length == 0)
{
fileStream = new FileStream(fileInfo.FullName, FileMode.Create, FileAccess.Write, FileShare.None, 1);
fileStream.Dispose();
fileStream = null;
fileInfo.LastWriteTimeUtc = this.fileIdentity.ListFileItem.LastWriteTime;
state = SynchronousState.Success;
}
else
{
if (fileInfo.Exists && this.fileIdentity.ListFileItem.Check(fileInfo))
{
state = SynchronousState.Success;
}
}
}
else
{
state = writeFrist();
}
}
}
else
{
state = writeFrist();
}
}
}
else
{
state = SynchronousState.TcpError;
}
}
catch { }
finally { Remove(state); }
}
/// <summary>
/// 小文件读取回调处理
/// </summary>
/// <param name="result"></param>
private void onReadAll(IAsyncResult result)
{
DownloadFileIdentity fileIdentity = null;
try
{
fileIdentity = fileStream.EndRead(result) == fileStream.Length ? new DownloadFileIdentity(fileInfo, buffer) : new DownloadFileIdentity(SynchronousState.ReadError);
}
catch { }
finally { removeCreate(fileIdentity); }
}
/// <summary>
/// 开始创建文件
/// </summary>
internal void Start()
{
DownloadFileIdentity fileIdentity = null;
bool isAsynchronous = false;
try
{
int bufferSize = (int)Math.Min(server.DownloadBufferSize, fileInfo.Length);
fileStream = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize, FileOptions.Asynchronous | FileOptions.SequentialScan);
if (fileStream.Length == fileInfo.Length)
{
if (fileStream.Length != 0 && !listFileItem.Check(fileInfo))
{
buffer = new byte[bufferSize];
if (fileStream.Length <= buffer.Length)
{
fileStream.BeginRead(buffer, 0, bufferSize, onReadAll, this);
}
else
{
if (listFileItem.LastWriteTime == fileInfo.LastWriteTimeUtc && listFileItem.Length < fileStream.Length)
{
fileStream.Seek(index = listFileItem.Length, SeekOrigin.Begin);
}
fileStream.BeginRead(buffer, 0, readSize = (int)Math.Min(fileStream.Length - index, bufferSize), onReadFirst, this);
}
isAsynchronous = true;
}
else
{
fileIdentity = new DownloadFileIdentity(fileInfo);
}
}
}
finally
{
if (!isAsynchronous)
{
removeCreate(fileIdentity);
}
}
}
/// <summary>
/// 第一次读取文件操作
/// </summary>
/// <param name="result"></param>
private void onReadFirst(IAsyncResult result)
{
DownloadFileIdentity fileIdentity = null;
try
{
if (fileStream.EndRead(result) == readSize)
{
if ((index += readSize) == fileStream.Length)
{
fileIdentity = new DownloadFileIdentity(fileInfo, buffer, index - readSize, index);
}
else
{
fileIdentity = new DownloadFileIdentity(Identity, fileInfo, buffer, index - readSize, index);
}
}
else
{
fileIdentity = new DownloadFileIdentity(SynchronousState.ReadError);
}
}
catch { }
finally
{
if (fileIdentity != null && fileIdentity.Tick != 0)
{
checkTimeoutSeconds = AutoCSer.Date.NowTime.CurrentSeconds;
onCreated(fileIdentity);
}
else
{
removeCreate(fileIdentity);
}
}
}
