public void ToStream(AbstractPager src, long startPage, long numberOfPages, Stream output)
{
// In case of encryption, we don't want to decrypt the data for backup,
// so let's work directly with the underlying encrypted data (Inner pager).
if ((_buffer.Length % Constants.Storage.PageSize) != 0)
{
throw new ArgumentException("The buffer length must be a multiple of the page size");
}
var steps = _buffer.Length / Constants.Storage.PageSize;
using (var tempTx = new TempPagerTransaction())
fixed(byte *pBuffer = _buffer)
{
for (long i = startPage; i < startPage + numberOfPages; i += steps)
{
var pagesToCopy = (int)(i + steps > numberOfPages ? numberOfPages - i : steps);
src.EnsureMapped(tempTx, i, pagesToCopy);
var ptr = src.AcquireRawPagePointer(tempTx, i);
Memory.Copy(pBuffer, ptr, pagesToCopy * Constants.Storage.PageSize);
output.Write(_buffer, 0, pagesToCopy * Constants.Storage.PageSize);
}
}
}
public void ToStream(AbstractPager src, long startPage, long numberOfPages,
Stream output, Action <string> infoNotify, CancellationToken cancellationToken)
{
// In case of encryption, we don't want to decrypt the data for backup,
// so let's work directly with the underlying encrypted data (Inner pager).
if ((_buffer.Length % Constants.Storage.PageSize) != 0)
{
throw new ArgumentException("The buffer length must be a multiple of the page size");
}
var steps = _buffer.Length / Constants.Storage.PageSize;
long totalCopied = 0;
var toBeCopied = new Size(numberOfPages * Constants.Storage.PageSize, SizeUnit.Bytes).ToString();
var totalSw = Stopwatch.StartNew();
var sw = Stopwatch.StartNew();
using (var tempTx = new TempPagerTransaction())
fixed(byte *pBuffer = _buffer)
{
for (var i = startPage; i < startPage + numberOfPages; i += steps)
{
cancellationToken.ThrowIfCancellationRequested();
var pagesToCopy = (int)(i + steps > numberOfPages ? numberOfPages - i : steps);
src.EnsureMapped(tempTx, i, pagesToCopy);
var ptr = src.AcquireRawPagePointer(tempTx, i);
var copiedInBytes = pagesToCopy * Constants.Storage.PageSize;
Memory.Copy(pBuffer, ptr, copiedInBytes);
output.Write(_buffer, 0, copiedInBytes);
totalCopied += copiedInBytes;
if (sw.ElapsedMilliseconds > 500)
{
infoNotify($"Copied: {new Size(totalCopied, SizeUnit.Bytes)} / {toBeCopied}");
sw.Restart();
}
}
}
var totalSecElapsed = Math.Max((double)totalSw.ElapsedMilliseconds / 1000, 0.0001);
infoNotify?.Invoke($"Finshed copying {new Size(totalCopied, SizeUnit.Bytes)}, " +
$"{new Size((long)(totalCopied / totalSecElapsed), SizeUnit.Bytes)}/sec");
}