public static void ResizeAndDismiss <T>(this IIOStream <T> stream, int length, Func <int, T> constructor)
{
var initialPosition = stream.Length;
stream.Length = length;
var buffer = MemoryPool <T> .GetArray();
try
{
using (var writer = stream.GetWriter())
{
writer.Position = initialPosition;
var numSlicesToWrite = writer.Length - writer.Position;
while (numSlicesToWrite > 0)
{
var blockSize = Math.Min(StreamUtils.BUFFER_SIZE, numSlicesToWrite);
initialPosition = writer.Position;
for (int i = 0; i < blockSize; i++)
{
buffer[i] = constructor(initialPosition + i);
}
numSlicesToWrite -= writer.Write(buffer, 0, blockSize);
}
}
}
finally
{
MemoryPool <T> .PutArray(buffer);
}
}
public static void Resize <T>(this IIOStream <T> stream, int length, Func <T> constructor, Action <T> destructor)
{
var buffer = MemoryPool <T> .GetArray();
try
{
using (var reader = stream.GetReader())
{
reader.Position = length;
var numSlicesToRead = reader.Length - reader.Position;
while (numSlicesToRead > 0)
{
var blockSize = reader.Read(buffer, 0, StreamUtils.BUFFER_SIZE);
for (int i = 0; i < blockSize; i++)
{
if (buffer[i] != null)
{
destructor(buffer[i]);
}
}
numSlicesToRead -= blockSize;
}
}
var initialPosition = stream.Length;
stream.Length = length;
using (var writer = stream.GetWriter())
{
writer.Position = initialPosition;
var numSlicesToWrite = writer.Length - writer.Position;
while (numSlicesToWrite > 0)
{
var blockSize = Math.Min(StreamUtils.BUFFER_SIZE, numSlicesToWrite);
for (int i = 0; i < blockSize; i++)
{
buffer[i] = constructor();
}
numSlicesToWrite -= writer.Write(buffer, 0, blockSize);
}
}
}
finally
{
MemoryPool <T> .PutArray(buffer);
}
}
void WriteStream <T>(IInStream <T> source, IIOStream <IInStream <T> > dest, int index)
{
if (dest.Length < (index + 1))
{
dest.Length = index + 1;
}
using (var w = dest.GetWriter())
{
w.Position = index;
if (source == null)
{
w.Write(StreamUtils.GetEmptyStream <T>());
}
else
{
w.Write(source);
}
}
}