marshal.cs

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/*
 * Marshal.cs - Implementation of the
 *			"System.Runtime.InteropServices.Marshal" class.
 *
 * Copyright (C) 2002  Southern Storm Software, Pty Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

namespace System.Runtime.InteropServices
{

#if CONFIG_RUNTIME_INFRA

using System;
using System.Runtime.CompilerServices;
using System.Reflection;
using System.Threading;
using System.Security;

// This class is not ECMA-compatible, strictly speaking.  But it is
// usually necessary for any application that uses PInvoke or C.

#if CONFIG_PERMISSIONS && !ECMA_COMPAT
[SuppressUnmanagedCodeSecurity]
#endif
public sealed class Marshal
{
	// This class cannot be instantiated.
	private Marshal() {}

	// Character size information.
	public static readonly int SystemDefaultCharSize = 1;
	public static readonly int SystemMaxDBCSCharSize = 6;

	// Allocate memory from the global (malloc) heap.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern public static IntPtr AllocHGlobal(IntPtr cb);
	public static IntPtr AllocHGlobal(int cb)
			{
				return AllocHGlobal(new IntPtr(cb));
			}

	// Internal version of "Copy" from managed to unmanaged.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static void CopyMU(Array source, int startOffset,
					           		  IntPtr destination, int numBytes);

	// Copy data from a managed array to an unmanaged memory pointer.
	public static void Copy(byte[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex, destination, length);
			}
	public static void Copy(char[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 2, destination, length * 2);
			}
	public static void Copy(double[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 8, destination, length * 8);
			}
	public static void Copy(float[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 4, destination, length * 4);
			}
	public static void Copy(int[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 4, destination, length * 4);
			}
	public static void Copy(long[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 8, destination, length * 8);
			}
	public static void Copy(short[] source, int startIndex,
					        IntPtr destination, int length)
			{
				if(source == null)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == IntPtr.Zero)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > source.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (source.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyMU(source, startIndex * 2, destination, length * 2);
			}

	// Internal version of "Copy" from unmanaged to managed.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static void CopyUM(IntPtr source, Array destination,
							   		  int startOffset, int numBytes);

	// Copy data from an unmanaged pointer to a managed array.
	public static void Copy(IntPtr source, byte[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex, length);
			}
	public static void Copy(IntPtr source, char[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 2, length * 2);
			}
	public static void Copy(IntPtr source, double[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 8, length * 8);
			}
	public static void Copy(IntPtr source, float[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 4, length * 4);
			}
	public static void Copy(IntPtr source, int[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 4, length * 4);
			}
	public static void Copy(IntPtr source, long[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 8, length * 8);
			}
	public static void Copy(IntPtr source, short[] destination,
							int startIndex, int length)
			{
				if(source == IntPtr.Zero)
				{
					throw new ArgumentNullException("source");
				}
				if(destination == null)
				{
					throw new ArgumentNullException("destination");
				}
				if(startIndex < 0 || startIndex > destination.Length)
				{
					throw new ArgumentOutOfRangeException
						("startIndex", _("ArgRange_Array"));
				}
				if(length < 0 || (destination.Length - startIndex) < length)
				{
					throw new ArgumentOutOfRangeException
						("length", _("ArgRange_Array"));
				}
				CopyUM(source, destination, startIndex * 2, length * 2);
			}

	// Free memory that was allocated with AllocHGlobal.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern public static void FreeHGlobal(IntPtr hglobal);

	// Get the offset of a field within a class.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static IntPtr OffsetOfInternal(Type t, String fieldName);
	public static IntPtr OffsetOf(Type t, String fieldName)
			{
				if(t == null)
				{
					throw new ArgumentNullException("t");
				}
				else if(!(t is ClrType))
				{
					throw new ArgumentException(_("Arg_MustBeType"), "t");
				}
				if(fieldName == null)
				{
					throw new ArgumentNullException("fieldName");
				}
				IntPtr offset = OffsetOfInternal(t, fieldName);
				if(offset == new IntPtr(-1))
				{
					throw new ArgumentException
						(_("Reflection_UnknownField"), "fieldName");
				}
				return offset;
			}

	// Convert a pointer to an ANSI string into a string object.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static String PtrToStringAnsiInternal(IntPtr ptr, int len);
	public static String PtrToStringAnsi(IntPtr ptr)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else
				{
					return PtrToStringAnsiInternal(ptr, -1);
				}
			}
	public static String PtrToStringAnsi(IntPtr ptr, int len)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else if(len < 0)
				{
					throw new ArgumentException(_("ArgRange_NonNegative"));
				}
				else
				{
					return PtrToStringAnsiInternal(ptr, len);
				}
			}

	// Convert a pointer to an Auto string into a string object.
	// In this implementation, "Auto" is UTF-8.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static String PtrToStringAutoInternal(IntPtr ptr, int len);
	public static String PtrToStringAuto(IntPtr ptr)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else
				{
					return PtrToStringAutoInternal(ptr, -1);
				}
			}
	public static String PtrToStringAuto(IntPtr ptr, int len)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else if(len < 0)
				{
					throw new ArgumentException(_("ArgRange_NonNegative"));
				}
				else
				{
					return PtrToStringAutoInternal(ptr, len);
				}
			}

	// Convert a pointer to a Unicode string into a string object.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static String PtrToStringUniInternal(IntPtr ptr, int len);
	public static String PtrToStringUni(IntPtr ptr)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else
				{
					return PtrToStringUniInternal(ptr, -1);
				}
			}
	public static String PtrToStringUni(IntPtr ptr, int len)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else if(len < 0)
				{
					throw new ArgumentException(_("ArgRange_NonNegative"));
				}
				else
				{
					return PtrToStringUniInternal(ptr, len);
				}
			}


	// Convert the data at an unmanaged pointer location into
	// an object by marshalling its fields one by one.
	[MethodImpl(MethodImplOptions.InternalCall)]
	extern private static bool PtrToStructureInternal
				(IntPtr ptr, Object structure, bool allowValueTypes);
	public static void PtrToStructure(IntPtr ptr, Object structure)
			{
				if(ptr == IntPtr.Zero)
				{
					throw new ArgumentNullException("ptr");
				}
				else if(structure == null)
				{
					throw new ArgumentNullException("structure");
				}
				if(!PtrToStructureInternal(ptr, structure, false))