UnmanagedMarshal.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Reflection / Emit / UnmanagedMarshal.cs / 1305376 / UnmanagedMarshal.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
namespace System.Reflection.Emit 
{ 
    using System.Runtime.InteropServices;
    using System; 
    using System.Security.Permissions;

    // This class is describing the fieldmarshal.
    [Serializable] 
    [HostProtection(MayLeakOnAbort = true)]
    [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 ||
#if FEATURE_COMINTEROP 
                unmanagedType == UnmanagedType.SafeArray ||
                unmanagedType == UnmanagedType.CustomMarshaler ||
#endif //FEATURE_COMINTEROP
                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);
        } 
 
#if FEATURE_COMINTEROP
        public static UnmanagedMarshal DefineSafeArray(UnmanagedType elemType) 
        {
            return new UnmanagedMarshal(UnmanagedType.SafeArray, Guid.Empty, 0, elemType);
        }
#endif //FEATURE_COMINTEROP 

        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 FEATURE_COMINTEROP 
                if (m_unmanagedType == UnmanagedType.CustomMarshaler)
                    return m_guid; 
#endif // FEATURE_COMINTEROP 

                // 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 FEATURE_COMINTEROP
                if (m_unmanagedType != UnmanagedType.LPArray && m_unmanagedType != UnmanagedType.SafeArray) 
#else
                if (m_unmanagedType != UnmanagedType.LPArray) 
#endif //!FEATURE_COMINTEROP 
                {
                    // 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 FEATURE_COMINTEROP
            if (m_unmanagedType == UnmanagedType.SafeArray || m_unmanagedType == UnmanagedType.LPArray) 
#else 
            if (m_unmanagedType == UnmanagedType.LPArray)
#endif //!FEATURE_COMINTEROP 
            {

                // syntax for NativeTypeSafeArray is
                //   
                //
                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)
            { 
                //   
                //
                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; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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