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DeviceStream.cs
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DeviceStream.cs
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// Copyright (c) 2018, Gustave M. - gus33000.me - @gus33000
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using Microsoft.Win32.SafeHandles;
using System;
using System.IO;
using System.Runtime.InteropServices;
namespace DumpIt
{
public class DeviceStream : Stream
{
private const uint GENERIC_READ = 0x80000000;
private const uint OPEN_EXISTING = 3;
private const uint DEVICE = 0x00000040;
private const uint NOBUFFERING = 0x20000000;
private string PhysicalDiskId;
private long _Position = 0;
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
private static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess,
uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition,
uint dwFlagsAndAttributes, IntPtr hTemplateFile);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool ReadFile(
IntPtr hFile,
byte[] lpBuffer,
int nNumberOfBytesToRead,
ref int lpNumberOfBytesRead,
IntPtr lpOverlapped
);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern uint DeviceIoControl(
SafeFileHandle hDevice,
uint dwIoControlCode,
IntPtr lpInBuffer,
uint nInBufferSize,
IntPtr lpOutBuffer,
int nOutBufferSize,
ref uint lpBytesReturned,
IntPtr lpOverlapped
);
[DllImport("kernel32.dll")]
private static extern bool SetFilePointerEx(SafeFileHandle hFile, long liDistanceToMove, out long lpNewFilePointer, uint dwMoveMethod);
private SafeFileHandle handleValue = null;
private long _length;
private static uint FILE_DEVICE_FILE_SYSTEM = 9;
private static uint METHOD_BUFFERED = 0;
private static uint FILE_ANY_ACCESS = 0x00000000;
private static uint FSCTL_LOCK_VOLUME = CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 6, METHOD_BUFFERED, FILE_ANY_ACCESS);
private static uint FSCTL_UNLOCK_VOLUME = CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 7, METHOD_BUFFERED, FILE_ANY_ACCESS);
private static uint CTL_CODE(uint DeviceType, uint Function, uint Method, uint Access)
{
return (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method));
}
public DeviceStream(string device)
{
PhysicalDiskId = device;
Load(device);
}
private void Load(string Path)
{
if (string.IsNullOrEmpty(Path))
{
throw new ArgumentNullException("Path");
}
_length = GetDiskSize.GetDiskLength(@"\\.\PhysicalDrive" + PhysicalDiskId.ToLower().Replace(@"\\.\physicaldrive", ""));
IntPtr ptr = CreateFile(Path, GENERIC_READ, 0, IntPtr.Zero, OPEN_EXISTING, DEVICE, IntPtr.Zero);
handleValue = new SafeFileHandle(ptr, true);
if (handleValue.IsInvalid)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
uint lpBytesReturned = 0;
var result = DeviceIoControl(handleValue, FSCTL_LOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, ref lpBytesReturned, IntPtr.Zero);
if (0 == result)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return true; }
}
public override bool CanWrite
{
get { return false; }
}
public override void Flush()
{
return;
}
public override long Length
{
get
{
return _length;
}
}
public override long Position
{
get
{
return _Position;
}
set
{
Seek(value, SeekOrigin.Begin);
}
}
/// <summary>
/// </summary>
/// <param name="buffer">An array of bytes. When this method returns, the buffer contains the specified byte array with the values between offset and
/// (offset + count - 1) replaced by the bytes read from the current source. </param>
/// <param name="offset">The zero-based byte offset in buffer at which to begin storing the data read from the current stream. </param>
/// <param name="count">The maximum number of bytes to be read from the current stream.</param>
/// <returns></returns>
public override int Read(byte[] buffer, int offset, int count)
{
int BytesRead = 0;
var BufBytes = new byte[count];
if (!ReadFile(handleValue.DangerousGetHandle(), BufBytes, count, ref BytesRead, IntPtr.Zero))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
for (int i = 0; i < BytesRead; i++)
{
buffer[offset + i] = BufBytes[i];
}
_Position += count;
return BytesRead;
}
public override int ReadByte()
{
int BytesRead = 0;
var lpBuffer = new byte[1];
if (!ReadFile(
handleValue.DangerousGetHandle(), // handle to file
lpBuffer, // data buffer
1, // number of bytes to read
ref BytesRead, // number of bytes read
IntPtr.Zero
))
{ Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); ; }
_Position += 1;
return lpBuffer[0];
}
public override long Seek(long offset, SeekOrigin origin)
{
long off = offset;
switch (origin)
{
case SeekOrigin.Current:
off += _Position;
break;
case SeekOrigin.End:
off += _length;
break;
}
long ret;
if (!SetFilePointerEx(handleValue, off, out ret, 0))
return _Position;
_Position = ret;
return ret;
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
public override void Close()
{
uint lpBytesReturned = 0;
var result = DeviceIoControl(handleValue, FSCTL_UNLOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, ref lpBytesReturned, IntPtr.Zero);
if (0 == result)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
handleValue.Close();
handleValue.Dispose();
handleValue = null;
base.Close();
}
private bool disposed = false;
new void Dispose()
{
Dispose(true);
base.Dispose();
GC.SuppressFinalize(this);
}
private new void Dispose(bool disposing)
{
// Check to see if Dispose has already been called.
if (!this.disposed)
{
if (disposing)
{
if (handleValue != null)
{
uint lpBytesReturned = 0;
var result = DeviceIoControl(handleValue, FSCTL_UNLOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, ref lpBytesReturned, IntPtr.Zero);
if (0 == result)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
handleValue.Close();
handleValue.Dispose();
handleValue = null;
}
}
// Note disposing has been done.
disposed = true;
}
}
}
}