void Copy(BlockReader reader, Func <IDataChunk, byte[]> payload)
{
byte[] data;
while (reader.CurrentChunk != null && null != (data = payload(reader.CurrentChunk)))
{
if (data.Length > 0)
{
target.Write(reader.CurrentChunk, data);
}
reader.Read();
CancellationToken.ThrowIfCancellationRequested();
}
}
static void Read()
{
using (var stream = new FileStream("75268096", FileMode.Open, FileAccess.Read, FileShare.Read, Constants.BlockSize /* , FileOptions.DeleteOnClose */))
{
var reader = new BlockReader(stream);
reader.Position = 75268096;
//reader.Position = 105810828;
//reader.Position = 105810830;
var list = new List <Packet>();
var watch = Stopwatch.StartNew();
while (reader.Read())
{
//list.Add(reader.Packet);
}
watch.Stop();
Console.WriteLine(watch.ElapsedMilliseconds);
watch.Restart();
int skip = 0;
var fileSize = stream.Length;
for (long pos = fileSize / 5 * 4; pos < fileSize; pos++)
{
reader.Seek(pos);
reader.Read();
skip += 1791;
if (skip > 10000)
{
skip = 0;
}
pos += skip;
}
watch.Stop();
Console.WriteLine(watch.ElapsedMilliseconds);
}
}
private void Open()
{
var options = FileOptions.None;
if (DeleteOnClose)
{
options |= FileOptions.DeleteOnClose;
}
if (CanWrite)
{
if (LowestAllowedOffset != 0 || HighestAllowedOffset != 0)
{
throw new InvalidOperationException($"{nameof(LowestAllowedOffset)} and {nameof(HighestAllowedOffset)} must be zero.");
}
writerStream = new FileStream(FileName, FileMode.CreateNew, FileAccess.Write, FileShare.Read | FileShare.Delete, Constants.BlockSize, options);
writer = new BlockWriter(writerStream);
}
readerStream = OpenRead();
if (HighestAllowedOffset == 0)
{
HighestAllowedOffset = readerStream.Length;
}
reader = new BlockReader(readerStream)
{
HighestAllowedOffset = HighestAllowedOffset
};
BlockIterator = new CachedBlockIterator(reader);
FileLength = HighestAllowedOffset;
}
} = -1; // highest valid block in the file
public CachedBlockIterator(BlockReader reader)
{
Reader = reader;
}
