//
// SafeBuffer.cs
//
// Authors:
// Zoltan Varga (vargaz@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.
//
#if NET_4_0 || BOOTSTRAP_NET_4_0
using System;
using System.IO;
using System.Collections.Generic;
using Microsoft.Win32.SafeHandles;
namespace System.Runtime.InteropServices{
public abstract class SafeBuffer : SafeHandleZeroOrMinusOneIsInvalid, IDisposable {
ulong byte_length;
unsafe byte *last_byte;
bool inited;
protected SafeBuffer (bool ownsHandle) : base (ownsHandle)
{
}
[CLSCompliant (false)]
public void Initialize (ulong numBytes)
{
if (numBytes == 0)
throw new ArgumentOutOfRangeException ("numBytes");
inited = true;
byte_length = numBytes;
unsafe {
last_byte = (byte *) (((byte *) handle) + numBytes);
}
}
[CLSCompliant (false)]
public void Initialize (uint numElements, uint sizeOfEachElement)
{
Initialize (numElements * sizeOfEachElement);
}
[CLSCompliant (false)]
public void Initialize<T> (uint numElements) where T : struct
{
Initialize (numElements, (uint)Marshal.SizeOf (typeof (T)));
}
[CLSCompliant (false)]
public unsafe void AcquirePointer (ref byte* pointer) {
if (!inited)
throw new InvalidOperationException ();
bool success = false;
DangerousAddRef (ref success);
if (success)
pointer = (byte*)handle;
}
public void ReleasePointer () {
if (!inited)
throw new InvalidOperationException ();
DangerousRelease ();
}
[CLSCompliant (false)]
public ulong ByteLength {
get {
return byte_length;
}
}
[CLSCompliant (false)]
public T Read<T> (ulong byteOffset) where T : struct
{
if (!inited)
throw new InvalidOperationException ();
unsafe {
byte *source = (((byte *) handle) + byteOffset);
if (source >= last_byte || source + Marshal.SizeOf (typeof (T)) > last_byte){
throw new ArgumentException ("byteOffset");
}
return (T) Marshal.PtrToStructure ((IntPtr) source, typeof (T));
}
}
[CLSCompliant (false)]
public void ReadArray<T> (ulong byteOffset, T[] array, int index, int count) where T : struct {
if (!inited)
throw new InvalidOperationException ();
unsafe {
int size = Marshal.SizeOf (typeof (T)) * count;
byte *source = (((byte *) handle) + byteOffset);
if (source >= last_byte || source + size > last_byte)
throw new ArgumentException ("byteOffset");
Marshal.copy_from_unmanaged ((IntPtr) source, index, array, count);
}
}
[CLSCompliant (false)]
public void Write<T> (ulong byteOffset, T value) where T : struct {
if (!inited)
throw new InvalidOperationException ();
unsafe {
byte *target = (((byte *) handle) + byteOffset);
if (target >= last_byte || target + Marshal.SizeOf (typeof (T)) > last_byte)
throw new ArgumentException ("byteOffset");
Marshal.StructureToPtr (value, (IntPtr) target, false);
}
}
[CLSCompliant (false)]
public void WriteArray<T> (ulong byteOffset, T[] array, int index, int count) where T : struct
{
if (!inited)
throw new InvalidOperationException ();
unsafe {
byte *target = ((byte *) handle) + byteOffset;
int size = Marshal.SizeOf (typeof (T)) * count;
if (target >= last_byte || target + size > last_byte)
throw new ArgumentException ("would overrite");
Marshal.copy_to_unmanaged (array, index, (IntPtr) target, count);
}
}
}
}
#endif
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