public void ExtentInfo()
{
using (SparseMemoryStream ms = new SparseMemoryStream())
{
Geometry diskGeometry = Geometry.FromCapacity(30 * 1024 * 1024);
NtfsFileSystem ntfs = NtfsFileSystem.Format(ms, "", diskGeometry, 0, diskGeometry.TotalSectorsLong);
// Check non-resident attribute
using (Stream s = ntfs.OpenFile(@"file", FileMode.Create, FileAccess.ReadWrite))
{
byte[] data = new byte[(int)ntfs.ClusterSize];
data[0] = 0xAE;
data[1] = 0x3F;
data[2] = 0x8D;
s.Write(data, 0, (int)ntfs.ClusterSize);
}
var extents = ntfs.PathToExtents("file");
Assert.Equal(1, extents.Length);
Assert.Equal(ntfs.ClusterSize, extents[0].Length);
ms.Position = extents[0].Start;
Assert.Equal(0xAE, ms.ReadByte());
Assert.Equal(0x3F, ms.ReadByte());
Assert.Equal(0x8D, ms.ReadByte());
// Check resident attribute
using (Stream s = ntfs.OpenFile(@"file2", FileMode.Create, FileAccess.ReadWrite))
{
s.WriteByte(0xBA);
s.WriteByte(0x82);
s.WriteByte(0x2C);
}
extents = ntfs.PathToExtents("file2");
Assert.Equal(1, extents.Length);
Assert.Equal(3, extents[0].Length);
byte[] read = new byte[100];
ms.Position = extents[0].Start;
ms.Read(read, 0, 100);
Assert.Equal(0xBA, read[0]);
Assert.Equal(0x82, read[1]);
Assert.Equal(0x2C, read[2]);
}
}