public void StartRead()
{
bool canRead = true;
int chunkNumber = 1;
while (canRead)
{
bool canSend = false;
lock (readLock)
{
if (readQueue.Count < queueCapacity)
{
canSend = true;
}
}
if (canSend)
{
byte[] NextSlice = null;
bool last = false;
switch (CompressionType)
{
//For compression we can read const size of chunks
case Compression.Enums.CompressionType.Compress:
NextSlice = readProvider.ReadNext(out last);
break;
//For decompression we need to read specific chunks of byte,
//so we detect how to read them by header specification
case Compression.Enums.CompressionType.Decompress:
NextSlice = readProvider
.SpecificRead(Compression.Utils.MagicNumbersAlgorithmDictionary
.AlgorithmMagicNumbers[algorithms].completeMask, out last);
break;
}
//send data
lock (readLock)
{
readQueue.Enqueue(new ByteBlock(NextSlice, chunkNumber, last));
}
chunkNumber++;
if (last)
{
canRead = false;
}
}
else
{
Thread.Sleep(1);
}
}
Console.WriteLine("[Output]: Data read completed!");
}
/// <summary>
/// Main process
/// </summary>
/// <remarks>
/// Using this method for milti threading file computation
/// </remarks>
/// <param name="param">Compression clone</param>
private void Processing(object param)
{
//Each thread get his own compression copy of class
Compression.Strategy.Compression compression = (Compression.Strategy.Compression)param;
Compression.Enums.CompressionType type;
bool last = false;
lock (comptypeLock)
{
type = _compressionType;
}
while (!last)
{
lock (lastLock)
{
last = _last;
}
byte[] byteBlock = null;
int current = GetCurrentBlock();
bool latest = false;
lock (readLock)
{
switch (type)
{
//Read Next chunk of datam, if this is a compress, so we can read const size of block
case Compression.Enums.CompressionType.Compress:
byteBlock = _input.ReadNext(out latest);
break;
//Then we are decompressing we don't know the size of the block, so we need to read from the file by specification of
//headers for compression
case Compression.Enums.CompressionType.Decompress:
byteBlock = _input.SpecificRead(
Compression.Utils.MagicNumbersAlgorithmDictionary
.AlgorithmMagicNumbers[compression.algorithms].completeMask, out latest);
break;
}
}
ByteBlock block = new ByteBlock(byteBlock, current, latest);
current++;
lock (currentLock)
{
_currentBlock++;
}
lock (lastLock)
{
_last = latest;
}
//Call method to compress or decompress
switch (type)
{
case Compression.Enums.CompressionType.Compress:
block.Slice = compression.Compress(block.Slice);
break;
case Compression.Enums.CompressionType.Decompress:
block.Slice = compression.Decompress(block.Slice);
break;
}
//Writing next chunk to the destination
lock (writeLock)
{
_output.WriteNext(block.Slice);
}
block.Slice = null;
//if the last block - call the handler
if (latest)
{
waitHandle.Set();
}
}
}
