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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System.Reflection.Emit
{
using System.Runtime.InteropServices;
using System;
using System.Security.Permissions;
// This class is describing the fieldmarshal.
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
[Obsolete("An alternate API is available: Emit the MarshalAs custom attribute instead. http://go.microsoft.com/fwlink/?linkid=14202")]
public sealed class UnmanagedMarshal
{
/******************************
[System.Runtime.InteropServices.ComVisible(true)]
* public static constructors. You can only construct
* UnmanagedMarshal using these static constructors.
******************************/
public static UnmanagedMarshal DefineUnmanagedMarshal(UnmanagedType unmanagedType)
{
if (unmanagedType == UnmanagedType.ByValTStr ||
unmanagedType == UnmanagedType.SafeArray ||
unmanagedType == UnmanagedType.CustomMarshaler ||
unmanagedType == UnmanagedType.ByValArray ||
unmanagedType == UnmanagedType.LPArray)
{
// not a simple native marshal
throw new ArgumentException(Environment.GetResourceString("Argument_NotASimpleNativeType"));
}
return new UnmanagedMarshal(unmanagedType, Guid.Empty, 0, (UnmanagedType) 0);
}
public static UnmanagedMarshal DefineByValTStr(int elemCount)
{
return new UnmanagedMarshal(UnmanagedType.ByValTStr, Guid.Empty, elemCount, (UnmanagedType) 0);
}
public static UnmanagedMarshal DefineSafeArray(UnmanagedType elemType)
{
return new UnmanagedMarshal(UnmanagedType.SafeArray, Guid.Empty, 0, elemType);
}
public static UnmanagedMarshal DefineByValArray(int elemCount)
{
return new UnmanagedMarshal(UnmanagedType.ByValArray, Guid.Empty, elemCount, (UnmanagedType) 0);
}
public static UnmanagedMarshal DefineLPArray(UnmanagedType elemType)
{
return new UnmanagedMarshal(UnmanagedType.LPArray, Guid.Empty, 0, elemType);
}
// accessor function for the native type
public UnmanagedType GetUnmanagedType
{
get { return m_unmanagedType; }
}
public Guid IIDGuid
{
get
{
if (m_unmanagedType == UnmanagedType.CustomMarshaler)
return m_guid;
// throw exception here. There is Guid only if CustomMarshaler
throw new ArgumentException(Environment.GetResourceString("Argument_NotACustomMarshaler"));
}
}
public int ElementCount
{
get
{
if (m_unmanagedType != UnmanagedType.ByValArray &&
m_unmanagedType != UnmanagedType.ByValTStr)
{
// throw exception here. There is NumElement only if NativeTypeFixedArray
throw new ArgumentException(Environment.GetResourceString("Argument_NoUnmanagedElementCount"));
}
return m_numElem;
}
}
public UnmanagedType BaseType
{
get
{
if (m_unmanagedType != UnmanagedType.LPArray && m_unmanagedType != UnmanagedType.SafeArray)
{
// throw exception here. There is NestedUnmanagedType only if LPArray or SafeArray
throw new ArgumentException(Environment.GetResourceString("Argument_NoNestedMarshal"));
}
return m_baseType;
}
}
private UnmanagedMarshal(UnmanagedType unmanagedType, Guid guid, int numElem, UnmanagedType type)
{
m_unmanagedType = unmanagedType;
m_guid = guid;
m_numElem = numElem;
m_baseType = type;
}
/************************
*
* Data member
*
*************************/
internal UnmanagedType m_unmanagedType;
internal Guid m_guid;
internal int m_numElem;
internal UnmanagedType m_baseType;
/************************
* this function return the byte representation of the marshal info.
*************************/
internal byte[] InternalGetBytes()
{
byte[] buf;
if (m_unmanagedType == UnmanagedType.SafeArray || m_unmanagedType == UnmanagedType.LPArray)
{
// syntax for NativeTypeSafeArray is
// <SafeArray | LPArray> <base type>
//
int cBuf = 2;
buf = new byte[cBuf];
buf[0] = (byte) (m_unmanagedType);
buf[1] = (byte) (m_baseType);
return buf;
}
else
if (m_unmanagedType == UnmanagedType.ByValArray ||
m_unmanagedType == UnmanagedType.ByValTStr)
{
// <ByValArray | ByValTStr> <encoded integer>
//
int cBuf;
int iBuf = 0;
if (m_numElem <= 0x7f)
cBuf = 1;
else if (m_numElem <= 0x3FFF)
cBuf = 2;
else
cBuf = 4;
// the total buffer size is the one byte + encoded integer size
cBuf = cBuf + 1;
buf = new byte[cBuf];
buf[iBuf++] = (byte) (m_unmanagedType);
if (m_numElem <= 0x7F)
{
buf[iBuf++] = (byte)(m_numElem & 0xFF);
} else if (m_numElem <= 0x3FFF)
{
buf[iBuf++] = (byte)((m_numElem >> 8) | 0x80);
buf[iBuf++] = (byte)(m_numElem & 0xFF);
} else if (m_numElem <= 0x1FFFFFFF)
{
buf[iBuf++] = (byte)((m_numElem >> 24) | 0xC0);
buf[iBuf++] = (byte)((m_numElem >> 16) & 0xFF);
buf[iBuf++] = (byte)((m_numElem >> 8) & 0xFF);
buf[iBuf++] = (byte)((m_numElem) & 0xFF);
}
return buf;
}
buf = new byte[1];
buf[0] = (byte) (m_unmanagedType);
return buf;
}
}
}
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