private void StartReadAndCompress()
{
//var threadName = Thread.CurrentThread.Name ?? "";
//Console.WriteLine($"{threadName} start");
using (var sourceStream = new FileStream(SourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
try
{
var maxPosition = sourceStream.Length;
byte[] buffer = new byte[Settings.ChunkSizeBytes];
while (true)
{
var currentPosition = PositionToRead.GetLastPositionAndIncrement();
if (currentPosition < 0)
{
break;
}
//Console.WriteLine($"{threadName} processing {currentPosition}");
var chunkSize = (int)Math.Min(Settings.ChunkSizeBytes, maxPosition - currentPosition);
sourceStream.Seek(currentPosition, SeekOrigin.Begin);
sourceStream.Read(buffer, 0, chunkSize);
using (MemoryStream ms = new MemoryStream())
{
using (GZipStream gs = new GZipStream(ms, CompressionMode.Compress))
gs.Write(buffer, 0, chunkSize);
QueueToWrite.Enqueue(new Task(currentPosition, ms.ToArray()));
}
}
}
catch (OutOfMemoryException)
{
QueueToWrite.Enqueue(new Task("There is no enough memory to continue"));
}
catch (Exception ex)
{
QueueToWrite.Enqueue(new Task(ex.Message));
}
finally
{
QueueToWrite.FinishEnqueue();
}
}
//Console.WriteLine($"{threadName} end");
}
private void StartReadAndDecompress()
{
//var threadName = Thread.CurrentThread.Name ?? "Main";
//Console.WriteLine($"{threadName} start");
using (var sourceStream = new FileStream(SourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
try
{
while (true)
{
var currentPosition = (int)PositionToRead.GetLastPositionAndIncrement();
if (currentPosition < 0)
{
break;
}
var chunk = Metadata.ChunkList[currentPosition];
//Console.WriteLine($"{threadName} processing {chunk.CompressedOffset}");
sourceStream.Seek(chunk.CompressedOffset, SeekOrigin.Begin);
using (MemoryStream ms = new MemoryStream())
{
using (GZipStream gs = new GZipStream(sourceStream, CompressionMode.Decompress, true))
gs.CopyTo(ms, Settings.ChunkSizeBytes);
QueueToWrite.Enqueue(new Task(chunk.UncompressedOffset, ms.ToArray()));
}
}
}
catch (Exception ex)
{
QueueToWrite.Enqueue(new Task(ex.Message));
}
finally
{
QueueToWrite.FinishEnqueue();
}
}
//Console.WriteLine($"{threadName} end");
}