+++ /dev/null
-//
-// System.IO.UnmanagedMemoryAccessor.cs
-//
-// Author:
-// Zoltan Varga (vargaz@gmail.com)
-// Marek Safar (marek.safar@gmail.com)
-//
-// Copyright (C) 2009 Novell, Inc (http://www.novell.com)
-//
-// 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 System;
-using System.Runtime.InteropServices;
-using System.Security.Permissions;
-
-namespace System.IO
-{
- [MonoTODO ("Offset is ignored")]
- public class UnmanagedMemoryAccessor : IDisposable {
- SafeBuffer buffer;
-#pragma warning disable 414
- long offset;
-#pragma warning restore
- long capacity;
- bool canwrite, canread;
-
- protected UnmanagedMemoryAccessor ()
- {
- }
-
- public UnmanagedMemoryAccessor (SafeBuffer buffer, long offset, long capacity)
- {
- Initialize (buffer, offset, capacity, FileAccess.ReadWrite);
- }
-
- public UnmanagedMemoryAccessor (SafeBuffer buffer, long offset, long capacity, FileAccess access)
- {
- Initialize (buffer, offset, capacity, access);
- }
-
- [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
- protected void Initialize(SafeBuffer buffer, long offset, long capacity, FileAccess access)
- {
- if (buffer == null)
- throw new ArgumentNullException ("buffer");
- if (offset < 0)
- throw new ArgumentOutOfRangeException ("offset");
- if (capacity < 0)
- throw new ArgumentOutOfRangeException ("capacity");
-
- if (access == FileAccess.Read || access == FileAccess.ReadWrite)
- canread = true;
- if (access == FileAccess.Write || access == FileAccess.ReadWrite)
- canwrite = true;
-
- if (this.buffer != null)
- Dispose (true);
-
- this.buffer = buffer;
- this.offset = offset;
- this.capacity = capacity;
- }
-
- public void Dispose ()
- {
- Dispose (true);
- GC.SuppressFinalize (this);
- }
-
- protected virtual void Dispose (bool disposing)
- {
- if (buffer != null){
- if (disposing){
- buffer.Dispose ();
- }
- }
- buffer = null;
- }
-
- public byte ReadByte (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<byte> ((ulong) position);
- }
-
- public bool ReadBoolean (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<bool> ((ulong) position);
- }
-
- public char ReadChar (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<char> ((ulong) position);
- }
-
- public decimal ReadDecimal (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<decimal> ((ulong) position);
- }
-
- public double ReadDouble (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<double> ((ulong) position);
- }
-
- public short ReadInt16 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<short> ((ulong) position);
- }
-
- public int ReadInt32 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<int> ((ulong) position);
- }
-
- public long ReadInt64 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<long> ((ulong) position);
- }
-
- [CLSCompliant (false)]
- public sbyte ReadSByte (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<sbyte> ((ulong) position);
- }
-
- public float ReadSingle (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<float> ((ulong) position);
- }
-
- [CLSCompliant (false)]
- public ushort ReadUInt16 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<ushort> ((ulong) position);
- }
-
- [CLSCompliant (false)]
- public uint ReadUInt32 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<uint> ((ulong) position);
- }
-
- [CLSCompliant (false)]
- public ulong ReadUInt64 (long position)
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- return buffer.Read<ulong> ((ulong) position);
- }
-
- public void Read<T> (long position, out T structure) where T : struct
- {
- if (!canread)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- structure = buffer.Read<T> ((ulong) position);
- }
-
- public int ReadArray<T> (long position, T [] array, int offset, int count) where T : struct
- {
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- long left = capacity - position;
- var slots = Math.Min (count, (int)(left / Marshal.SizeOf (typeof (T))));
-
- buffer.ReadArray ((ulong) position, array, offset, slots);
- return slots;
- }
-
- public void Write (long position, bool value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, byte value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, char value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, decimal value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, double value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, short value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, int value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, long value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- [CLSCompliant (false)]
- public void Write (long position, sbyte value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write (long position, float value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- [CLSCompliant (false)]
- public void Write (long position, ushort value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- [CLSCompliant (false)]
- public void Write (long position, uint value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- [CLSCompliant (false)]
- public void Write (long position, ulong value)
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write ((ulong)position, value);
- }
-
- public void Write<T> (long position, ref T structure) where T : struct
- {
- if (!canwrite)
- throw new NotSupportedException ();
- if (buffer == null)
- throw new ObjectDisposedException ("buffer");
- if (position < 0)
- throw new ArgumentOutOfRangeException ();
-
- buffer.Write<T> ((ulong)position, structure);
- }
-
- public void WriteArray<T> (long position, T [] array, int offset, int count) where T : struct
- {
- buffer.WriteArray ((ulong)position, array, offset, count);
- }
-
- public bool CanRead {
- get { return canread; }
- }
-
- public bool CanWrite {
- get { return canwrite; }
- }
-
- public long Capacity {
- get { return capacity; }
- }
-
- protected bool IsOpen {
- get { return buffer != null; }
- }
- }
-}
-
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