Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Reflection / Emit / UnmanagedMarshal.cs / 1 / 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 || #endif //FEATURE_COMINTEROP unmanagedType == UnmanagedType.ByValArray || unmanagedType == UnmanagedType.LPArray || unmanagedType == UnmanagedType.CustomMarshaler) { // 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 (m_unmanagedType != UnmanagedType.CustomMarshaler) { // throw exception here. There is Guid only if CustomMarshaler throw new ArgumentException(Environment.GetResourceString("Argument_NotACustomMarshaler")); } return m_guid; } } 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; } } }
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