public async Task DownloadFile(string virtualPath, string systemPath, bool lowPriority = false)
{
var size = await GetFileSize(virtualPath).ConfigureAwait(false);
long position = 0;
if (size < 0)
{
throw new FileNotFoundException($"There is no {virtualPath} on the server");
}
using (lowPriority ? ThreadUtility.EnterBackgroundProcessingMode() : null)
using (var fs = File.OpenWrite(systemPath))
{
while (position < size)
{
var chunkLength = (int)Math.Min(1024 * 1024, size - position);
using (var bytes = await DownloadSegment(virtualPath, position, chunkLength).ConfigureAwait(false))
{
if (bytes.Object == null)
{
throw new IOException();
}
await fs.WriteAsync(bytes.Object, 0, chunkLength).ConfigureAwait(false);
}
position += chunkLength;
}
}
}
private static byte[][] ReadLeafs(HashAlgorithm tg, string filePath, long start, long end)
{
using (ThreadUtility.EnterBackgroundProcessingMode())
using (var threadFilePtr = FileStreamFactory.CreateFileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 128 * 1024))
{
var threadFileBlock = new FileBlock(start, end);
var LeafSize = 1024;
var DataBlockSize = LeafSize * 1024;
var data = new byte[LeafSize + 1];
var totalLeafs = threadFileBlock.Length / LeafSize + threadFileBlock.Length % LeafSize > 0 ? 1 : 0;
var result = new byte[totalLeafs][];
threadFilePtr.Position = threadFileBlock.Start;
while (threadFilePtr.Position < threadFileBlock.End)
{
var leafIndex = (int)((threadFilePtr.Position - start) / 1024);
var dataBlock = new byte[Math.Min(threadFileBlock.End - threadFilePtr.Position, DataBlockSize)];
threadFilePtr.Read(dataBlock, 0, dataBlock.Length); //read block
var blockLeafs = dataBlock.Length / LeafSize;
int i;
for (i = 0; i < blockLeafs; i++)
{
Buffer.BlockCopy(dataBlock, i * LeafSize, data, 1, LeafSize);
tg.Initialize();
result[leafIndex++] = tg.ComputeHash(data);
}
if (i * LeafSize < dataBlock.Length)
{
data = new byte[dataBlock.Length - blockLeafs * LeafSize + 1];
data[0] = LeafHash;
Buffer.BlockCopy(dataBlock, blockLeafs * LeafSize, data, 1, (data.Length - 1));
tg.Initialize();
result[leafIndex] = tg.ComputeHash(data);
data = new byte[LeafSize + 1];
data[0] = LeafHash;
}
}
return(result);
}
}
void ProcessLeafs(object threadId)
{
using (LowPriority ? ThreadUtility.EnterBackgroundProcessingMode() : null)
using (var threadFilePtr = FileStreamFactory.CreateFileStream(_filename, FileMode.Open, FileAccess.Read, FileShare.Read, FileStreamBufferLength))
{
var threadFileBlock = _fileParts[(int)threadId];
var tg = new T();
var data = new byte[LeafSize + 1];
threadFilePtr.Position = threadFileBlock.Start;
var dataBlock = new byte[DataBlockSize];
while (threadFilePtr.Position < threadFileBlock.End)
{
var leafIndex = (int)(threadFilePtr.Position / 1024);
var dataBlockSize = (int)Math.Min(threadFileBlock.End - threadFilePtr.Position, DataBlockSize);
threadFilePtr.Read(dataBlock, 0, dataBlockSize); //read block
Interlocked.Add(ref _processedBytes, dataBlockSize);
var blockLeafs = dataBlockSize / 1024;
int i;
for (i = 0; i < blockLeafs; i++)
{
Buffer.BlockCopy(dataBlock, i * LeafSize, data, 1, LeafSize);
tg.Initialize();
TTH[0][leafIndex++] = tg.ComputeHash(data);
}
if (i * LeafSize < dataBlockSize)
{
data = new byte[dataBlockSize - blockLeafs * LeafSize + 1];
data[0] = LeafHash;
Buffer.BlockCopy(dataBlock, blockLeafs * LeafSize, data, 1, (data.Length - 1));
tg.Initialize();
TTH[0][leafIndex] = tg.ComputeHash(data);
data = new byte[LeafSize + 1];
data[0] = LeafHash;
}
}
}
}
void CompressTree()
{
int level = 0;
using (LowPriority ? ThreadUtility.EnterBackgroundProcessingMode() : null)
{
while (level + 1 < LevelCount)
{
int leafIndex = 0;
var internalLeafCount = (_leafCount / 2) + (_leafCount % 2);
TTH[level + 1] = new byte[internalLeafCount][];
if (!LowPriority && _leafCount > 128)
{
Parallel.For(0, _leafCount / 2,
ind => ProcessInternalLeaf(level + 1, ind, TTH[level][ind * 2], TTH[level][ind * 2 + 1]));
leafIndex = _leafCount / 2;
}
else
{
for (var i = 1; i < _leafCount; i += 2)
{
ProcessInternalLeaf(level + 1, leafIndex++, TTH[level][i - 1], TTH[level][i]);
}
}
if (leafIndex < internalLeafCount)
{
TTH[level + 1][leafIndex] = TTH[level][_leafCount - 1];
}
level++;
_leafCount = internalLeafCount;
}
}
}
