UnmanagedMarshal.cs :  » 2.6.4-mono-.net-core » System.Reflection » System » Reflection » Emit » C# / CSharp Open Source

//
// Copyright (C) 2004 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.
//

//
// System.Reflection.Emit/UnmanagedMarshal.cs
//
// Author:
//   Paolo Molaro (lupus@ximian.com)
//
// (C) 2001-2002 Ximian, Inc.  http://www.ximian.com
//

using System.Reflection.Emit;
using System.Runtime.InteropServices;
using System;

namespace System.Reflection.Emit{

  [Obsolete ("An alternate API is available: Emit the MarshalAs custom attribute instead.")]
  [ComVisible (true)]
  [Serializable]
  public sealed class UnmanagedMarshal {
#pragma warning disable 169, 414
    private int count;
    private UnmanagedType t;
    private UnmanagedType tbase;
    string guid;
    string mcookie;
    string marshaltype;
    Type marshaltyperef;
    private int param_num;
    private bool has_size;
#pragma warning restore 169, 414
    
    private UnmanagedMarshal (UnmanagedType maint, int cnt) {
      count = cnt;
      t = maint;
      tbase = maint;
    }
    private UnmanagedMarshal (UnmanagedType maint, UnmanagedType elemt) {
      count = 0;
      t = maint;
      tbase = elemt;
    }
    
    public UnmanagedType BaseType {
      get {
        if (t == UnmanagedType.LPArray || t == UnmanagedType.SafeArray)
          throw new ArgumentException ();
        return tbase;
      }
    }

    public int ElementCount {
      get {return count;}
    }

    public UnmanagedType GetUnmanagedType {
      get {return t;}
    }

    public Guid IIDGuid {
      get {return new Guid (guid);}
    }

    public static UnmanagedMarshal DefineByValArray( int elemCount) {
      return new UnmanagedMarshal (UnmanagedType.ByValArray, elemCount);
    }

    public static UnmanagedMarshal DefineByValTStr( int elemCount) {
      return new UnmanagedMarshal (UnmanagedType.ByValTStr, elemCount);
    }

    public static UnmanagedMarshal DefineLPArray( UnmanagedType elemType) {
      return new UnmanagedMarshal (UnmanagedType.LPArray, elemType);
    }

    public static UnmanagedMarshal DefineSafeArray( UnmanagedType elemType) {
      return new UnmanagedMarshal (UnmanagedType.SafeArray, elemType);
    }

    public static UnmanagedMarshal DefineUnmanagedMarshal( UnmanagedType unmanagedType) {
      return new UnmanagedMarshal (unmanagedType, unmanagedType);
    }

    /* this one is missing from the MS implementation */
    public static UnmanagedMarshal DefineCustom (Type typeref, string cookie, string mtype, Guid id) {
      UnmanagedMarshal res = new UnmanagedMarshal (UnmanagedType.CustomMarshaler, UnmanagedType.CustomMarshaler);
      res.mcookie = cookie;
      res.marshaltype = mtype;
      res.marshaltyperef = typeref;
      if (id == Guid.Empty)
        res.guid = String.Empty;
      else
        res.guid = id.ToString ();
      return res;
    }

    // sizeConst and sizeParamIndex can be -1 meaning they are not specified
    internal static UnmanagedMarshal DefineLPArrayInternal (UnmanagedType elemType, int sizeConst, int sizeParamIndex) {
      UnmanagedMarshal res = new UnmanagedMarshal (UnmanagedType.LPArray, elemType);
      res.count = sizeConst;
      res.param_num = sizeParamIndex;
      res.has_size = true;

      return res;
    }

    internal MarshalAsAttribute ToMarshalAsAttribute () {
      MarshalAsAttribute attr = new MarshalAsAttribute (t);
      attr.ArraySubType = tbase;
      attr.MarshalCookie = mcookie;
      attr.MarshalType = marshaltype;
      attr.MarshalTypeRef = marshaltyperef;
      if (count == -1)
        attr.SizeConst = 0;
      else
        attr.SizeConst = count;
      if (param_num == -1)
        attr.SizeParamIndex = 0;
      else
        attr.SizeParamIndex = (short)param_num;
      return attr;
    }
  }
}