private DownloadErrorCode?CheckDownloadedFile(ref DownloadTaskInfo taskInfo, out string errorMessage)
{
bool sizeCheck = taskInfo.Size <= 0L || taskInfo.Size == DownloadedSize;
errorMessage = string.Empty;
if (!sizeCheck)
{
errorMessage = Utility.Text.Format("Expected size is '{0}' while actual size is '{1}'", taskInfo.Size, DownloadedSize);
return(DownloadErrorCode.WrongSize);
}
if (taskInfo.Crc32 == null)
{
return(null);
}
using (var fs = File.OpenRead(m_TempSavePath))
{
var actualCrc32 = Algorithm.Crc32.Sum(fs);
if (actualCrc32 == taskInfo.Crc32.Value)
{
return(null);
}
else
{
errorMessage = Utility.Text.Format("CRC 32 inconsistency: expects '{0}' but actually is '{1}'.",
taskInfo.Crc32.Value, actualCrc32);
return(DownloadErrorCode.WrongChecksum);
}
}
}
private void TackleDownloadingIsOver(ref DownloadTaskInfo taskInfo)
{
string errorMessage;
var errorCode = CheckDownloadedFile(ref taskInfo, out errorMessage);
if (errorCode == null)
{
Directory.CreateDirectory(Path.GetDirectoryName(taskInfo.SavePath) ?? throw new NullReferenceException());
if (File.Exists(taskInfo.SavePath))
{
File.Delete(taskInfo.SavePath);
}
File.Move(m_TempSavePath, taskInfo.SavePath);
IsDone = true;
ErrorCode = null;
}
else
{
IsDone = false;
ErrorCode = errorCode;
ErrorMessage = errorMessage;
File.Delete(m_TempSavePath);
}
m_Status = Status.Finished;
}