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104 lines
3.7 KiB
104 lines
3.7 KiB
/* Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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using System;
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using System.Runtime.InteropServices;
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using Microsoft.Win32.SafeHandles;
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namespace Alphaleonis.Win32.Security
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{
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/// <summary>An IntPtr wrapper which can be used as the result of a Marshal.AllocHGlobal operation.
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/// <para>Calls Marshal.FreeHGlobal when disposed or finalized.</para>
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/// </summary>
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internal sealed class SafeLocalMemoryBufferHandle : SafeHandleZeroOrMinusOneIsInvalid
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{
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#region Constructors
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/// <summary>Creates new instance with zero IntPtr.</summary>
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public SafeLocalMemoryBufferHandle() : base(true)
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{
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}
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#endregion // Constructors
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#region Methods
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#region CopyFrom
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/// <summary>Copies data from a one-dimensional, managed 8-bit unsigned integer array to the unmanaged memory pointer referenced by this instance.</summary>
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/// <param name="source">The one-dimensional array to copy from.</param>
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/// <param name="startIndex">The zero-based index into the array where Copy should start.</param>
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/// <param name="length">The number of array elements to copy.</param>
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public void CopyFrom(byte[] source, int startIndex, int length)
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{
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Marshal.Copy(source, startIndex, handle, length);
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}
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#endregion // CopyFrom
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#region CopyTo
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public void CopyTo(byte[] destination, int destinationOffset, int length)
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{
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if (destination == null)
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throw new ArgumentNullException("destination");
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if (destinationOffset < 0)
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throw new ArgumentOutOfRangeException("destinationOffset", Resources.Negative_Destination_Offset);
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if (length < 0)
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throw new ArgumentOutOfRangeException("length", Resources.Negative_Length);
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if (destinationOffset + length > destination.Length)
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throw new ArgumentException(Resources.Destination_Buffer_Not_Large_Enough);
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Marshal.Copy(handle, destination, destinationOffset, length);
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}
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#endregion // CopyTo
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#region ToByteArray
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public byte[] ToByteArray(int startIndex, int length)
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{
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if (IsInvalid)
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return null;
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byte[] arr = new byte[length];
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Marshal.Copy(handle, arr, startIndex, length);
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return arr;
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}
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#endregion // ToByteArray
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#region ReleaseHandle
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/// <summary>Called when object is disposed or finalized.</summary>
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protected override bool ReleaseHandle()
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{
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return handle == IntPtr.Zero || NativeMethods.LocalFree(handle) == IntPtr.Zero;
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}
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#endregion // ReleaseHandle
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#endregion // Methods
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}
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}
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