public void Sparse()
{
int fileSize = 1 * 1024 * 1024;
NtfsFileSystem ntfs = new FileSystemSource().NtfsFileSystem();
byte[] data = new byte[fileSize];
for (int i = 0; i < fileSize; i++)
{
data[i] = (byte)i;
}
using (SparseStream s = ntfs.OpenFile("file.bin", FileMode.CreateNew))
{
s.Write(data, 0, fileSize);
ntfs.SetAttributes("file.bin", ntfs.GetAttributes("file.bin") | FileAttributes.SparseFile);
s.Position = 64 * 1024;
s.Clear(128 * 1024);
s.Position = fileSize - 64 * 1024;
s.Clear(128 * 1024);
}
using (SparseStream s = ntfs.OpenFile("file.bin", FileMode.Open))
{
Assert.AreEqual(fileSize + 64 * 1024, s.Length);
List <StreamExtent> extents = new List <StreamExtent>(s.Extents);
Assert.AreEqual(2, extents.Count);
Assert.AreEqual(0, extents[0].Start);
Assert.AreEqual(64 * 1024, extents[0].Length);
Assert.AreEqual((64 + 128) * 1024, extents[1].Start);
Assert.AreEqual(fileSize - (64 * 1024) - ((64 + 128) * 1024), extents[1].Length);
s.Position = 72 * 1024;
s.WriteByte(99);
byte[] readBuffer = new byte[fileSize];
s.Position = 0;
s.Read(readBuffer, 0, fileSize);
for (int i = 64 * 1024; i < (128 + 64) * 1024; ++i)
{
data[i] = 0;
}
for (int i = fileSize - (64 * 1024); i < fileSize; ++i)
{
data[i] = 0;
}
data[72 * 1024] = 99;
Assert.AreEqual(data, readBuffer);
}
}
public void Sparse()
{
int fileSize = 1 * 1024 * 1024;
NtfsFileSystem ntfs = new FileSystemSource().NtfsFileSystem();
byte[] data = new byte[fileSize];
for (int i = 0; i < fileSize; i++)
{
data[i] = (byte)i;
}
using (SparseStream s = ntfs.OpenFile("file.bin", FileMode.CreateNew))
{
s.Write(data, 0, fileSize);
ntfs.SetAttributes("file.bin", ntfs.GetAttributes("file.bin") | FileAttributes.SparseFile);
s.Position = 64 * 1024;
s.Clear(128 * 1024);
s.Position = fileSize - 64 * 1024;
s.Clear(128 * 1024);
}
using (SparseStream s = ntfs.OpenFile("file.bin", FileMode.Open))
{
Assert.AreEqual(fileSize + 64 * 1024, s.Length);
List<StreamExtent> extents = new List<StreamExtent>(s.Extents);
Assert.AreEqual(2, extents.Count);
Assert.AreEqual(0, extents[0].Start);
Assert.AreEqual(64 * 1024, extents[0].Length);
Assert.AreEqual((64 + 128) * 1024, extents[1].Start);
Assert.AreEqual(fileSize - (64 * 1024) - ((64 + 128) * 1024), extents[1].Length);
s.Position = 72 * 1024;
s.WriteByte(99);
byte[] readBuffer = new byte[fileSize];
s.Position = 0;
s.Read(readBuffer, 0, fileSize);
for (int i = 64 * 1024; i < (128 + 64) * 1024; ++i)
{
data[i] = 0;
}
for (int i = fileSize - (64 * 1024); i < fileSize; ++i)
{
data[i] = 0;
}
data[72 * 1024] = 99;
Assert.AreEqual(data, readBuffer);
}
}
