MetabaseReader.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Activation / MetabaseReader.cs / 1 / MetabaseReader.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Activation
{ 
    using System;
    using System.Globalization; 
    using System.Text; 
    using System.Collections.Generic;
    using System.Runtime.InteropServices; 
    using System.ServiceModel.Security;
    using System.Threading;
    using Microsoft.Win32.SafeHandles;
    using System.Security; 
    using System.Security.Permissions;
 
    // These values are copied from %SDXROOT%\public\sdk\inc\iiscnfg.h. 
    enum MetabasePropertyType
    { 
        ServerBindings = 1023,
        SecureBindings = 2021,
        AuthFlags = 6000,
        Realm = 6001, 
        AnonymousUserName = 6020,
        AnonymousPassword = 6021, 
        AccessSslFlags = 6030, 
        AuthPersistence = 6031,
        AuthProviders = 6032, 
    }

    /// 
    /// Critical - does a bunch of unsafe and native access 
    ///            caller should guard MetabaseReader instance as well as any results
    ///  
    [SecurityCritical(SecurityCriticalScope.Everything)] 
    class MetabaseReader : IDisposable
    { 
        internal const string LMPath = "/LM";
        const uint E_INSUFFICIENT_BUFFER = 0x8007007A;
        const uint E_PATH_NOT_FOUND = 0x80070003;
        const uint E_DATA_NOT_FOUND = 0x800CC801; 

        static IMSAdminBase adminBase; 
        static object syncRoot = new object(); 
        int mdHandle = 0;
        METADATA_RECORD record; 
        SafeHandle bufferHandle;
        uint currentBufferSize = 1024;
        bool disposed;
 
        public MetabaseReader()
        { 
            lock (syncRoot) 
            {
                if (adminBase == null) 
                {
                    adminBase = (IMSAdminBase)new MSAdminBase();
                }
            } 

            uint handle; 
            uint hResult = adminBase.OpenKey(MSAdminBase.METADATA_MASTER_ROOT_HANDLE, LMPath, 
                MSAdminBase.METADATA_PERMISSION_READ, MSAdminBase.DEFAULT_METABASE_TIMEOUT, out handle);
            mdHandle = (int) handle; 

            if (hResult != 0)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(SR.GetString(SR.Hosting_MetabaseAccessError), 
                    (int)hResult));
            } 
 
            bufferHandle = SafeHGlobalHandleWrapper.AllocHGlobal(currentBufferSize);
        } 

        ~MetabaseReader()
        {
            Dispose(false); 
        }
 
        public object GetData(string path, MetabasePropertyType propertyType) 
        {
            return GetData(path, (uint)propertyType); 
        }

        public void Dispose()
        { 
            Dispose(true);
            GC.SuppressFinalize(this); 
        } 

        void EnsureRecordBuffer(uint bytes) 
        {
            if (bytes <= currentBufferSize)
            {
                return; 
            }
 
            SafeHGlobalHandleWrapper.CloseHandle(bufferHandle); 
            currentBufferSize = bytes;
            bufferHandle = SafeHGlobalHandleWrapper.AllocHGlobal(currentBufferSize); 

            record.pbMDData = bufferHandle.DangerousGetHandle();
            record.dwMDDataLen = currentBufferSize;
        } 

        object GetData(string path, uint type) 
        { 
            uint bytes = currentBufferSize;
            record.dwMDAttributes = MSAdminBase.METADATA_INHERIT; 
            record.dwMDUserType = MSAdminBase.IIS_MD_UT_SERVER;
            record.dwMDDataType = MSAdminBase.ALL_METADATA;
            record.dwMDIdentifier = type;
            record.pbMDData = bufferHandle.DangerousGetHandle(); 
            record.dwMDDataLen = currentBufferSize;
 
            uint hResult = adminBase.GetData((uint) mdHandle, path, ref record, ref bytes); 
            if (hResult == E_INSUFFICIENT_BUFFER)
            { 
                EnsureRecordBuffer(bytes);
                hResult = adminBase.GetData((uint) mdHandle, path, ref record, ref bytes);
            }
 
            if (hResult == E_PATH_NOT_FOUND || hResult == E_DATA_NOT_FOUND)
            { 
                return null; 
            }
            else if (hResult != 0) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(SR.GetString(SR.Hosting_MetabaseAccessError),
                    (int)hResult));
            } 

            return ConvertData(); 
        } 

        object ConvertData() 
        {
            switch (record.dwMDDataType)
            {
                case MSAdminBase.DWORD_METADATA: 
                    return (UInt32)Marshal.ReadInt32(record.pbMDData);
                case MSAdminBase.EXPANDSZ_METADATA: 
                case MSAdminBase.STRING_METADATA: 
                    return Marshal.PtrToStringUni(record.pbMDData);
                case MSAdminBase.MULTISZ_METADATA: 
                    return RecordToStringArray();
                default:
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(SR.GetString(
                        SR.Hosting_MetabaseDataTypeUnsupported, 
                        record.dwMDDataType.ToString(NumberFormatInfo.CurrentInfo),
                        record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo)))); 
            } 
        }
 
        string[] RecordToStringArray()
        {
            List list = new List();
            if (record.dwMDDataType == MSAdminBase.MULTISZ_METADATA) 
            {
                // Ensure that the data is an array of double-byte unicode chars. 
                if ((record.dwMDDataLen & 1) != 0) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new DataMisalignedException(SR.GetString( 
                        SR.Hosting_MetabaseDataStringsTerminate, record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo))));
                }

                int startPos = 0; 
                int endPos = 0;
                while (record.dwMDDataLen > 0) 
                { 
                    // Scan for a null terminator.
                    while (endPos < record.dwMDDataLen && Marshal.ReadInt16(record.pbMDData, endPos) != 0) 
                    {
                        endPos += 2;
                    }
 
                    if (endPos == record.dwMDDataLen &&
                        Marshal.ReadInt16(record.pbMDData, endPos - 2) != 0) 
                    { 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new DataMisalignedException(SR.GetString(
                            SR.Hosting_MetabaseDataStringsTerminate, record.dwMDIdentifier.ToString(NumberFormatInfo.CurrentInfo)))); 
                    }

                    // End of the string.
                    if (endPos == startPos) 
                    {
                        break; 
                    } 

                    // Convert to string. 
                    list.Add(Marshal.PtrToStringUni(new IntPtr(record.pbMDData.ToInt64() + startPos),
                        (endPos - startPos)/2));

                    // Go to next string 
                    startPos = endPos += 2;
                } 
            } 

            return list.ToArray(); 
        }

        void Dispose(bool disposing)
        { 
            if (!disposed)
            { 
                if (disposing) 
                {
                    record.pbMDData = IntPtr.Zero; 
                    currentBufferSize = 0;

                    if (bufferHandle != null)
                    { 
                        SafeHGlobalHandleWrapper.CloseHandle(bufferHandle);
                    } 
                } 

                int handleToClose = Interlocked.Exchange(ref mdHandle, 0); 
                if (handleToClose != 0)
                {
                    adminBase.CloseKey((uint) handleToClose);
                } 

                //Notice we cannot assign adminBase to NULL in Dispose, because 
                //it could be shared by multiple instances of MetabaseReader. 

                disposed = true; 
            }
        }

        static class SafeHGlobalHandleWrapper 
        {
            [SecurityPermission(SecurityAction.Assert, UnmanagedCode=true)] 
            public static SafeHandle AllocHGlobal(uint cb) 
            {
                return System.IdentityModel.SafeHGlobalHandle.AllocHGlobal(cb); 
            }

            [SecurityPermission(SecurityAction.Assert, UnmanagedCode = true)]
            public static void CloseHandle(SafeHandle handle) 
            {
                handle.Close(); 
            } 

        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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MetabaseReader.cs source code in C# .NET

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