public void ReadBlocks(int numCurrentBigBlock, int numberOfBlocks, int[] blocksLength = null)
{
long currentBlockToSkip = numCurrentBigBlock * Constants.BigBlockCount;
long currentPosition = 0;
for (var i = 0; i < currentBlockToSkip; i++)
{
currentPosition += blocksLength?[i] ?? Constants.BlockLength;
}
_blocks = new byte[numberOfBlocks][];
var threads = new Thread[numberOfBlocks];
for (long i = 0; i < numberOfBlocks; i++)
{
var reader = new BlockReader(_sourceFile, currentPosition);
reader.ReadedEvent += (sender, args) =>
{
_blocks[args.IndexOfArray] = args.DataProcessed;
};
var lastBlockLength = (int)(numCurrentBigBlock == _countBigBlocks && i == numberOfBlocks - 1
? _totalLength % Constants.BlockLength
: 0);
threads[i] = reader.ReadBlock(new Data(null, Work.Zip, (int)i, blocksLength?[i + currentBlockToSkip] ?? lastBlockLength));
currentPosition += blocksLength?[i + currentBlockToSkip] ?? Constants.BlockLength;
}
foreach (var thread in threads)
{
thread.Join();
}
ReadedEvent?.Invoke(this, new ReadDataProcessEventArgs(_blocks, numCurrentBigBlock));
}
private void ReadBlockForLength(object inputObject)
{
SemRead.WaitOne();
var dataInput = (Data)inputObject;
var index = dataInput.ArrayIndex;
var length = dataInput.Length == 0 ? (int)Constants.BlockLength : dataInput.Length;
var block = new byte[length];
using (var sourceStream = new FileStream(_sourceFile, FileMode.Open, FileAccess.Read,
FileShare.Read, (int)Constants.BlockLength, true))
{
sourceStream.Seek(_startPosition, SeekOrigin.Begin);
sourceStream.Read(block, 0, length);
ReadedEvent?.Invoke(this, new DataProcessEventArgs(block, index));
}
SemRead.Release();
}
