// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
 
//
// SafeX509Handles.cs
//
 
namespace System.Security.Cryptography.X509Certificates {
    using System.Runtime.InteropServices;
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution;
    using System.Runtime.Versioning;
    using Microsoft.Win32.SafeHandles;
 
    // Since we need sometimes to delete the key container associated with a cert
    // context, the handle used in this class is actually a pointer
    // to a CERT_CTX unmanaged structure defined in COMX509Certificate.h
 
    [System.Security.SecurityCritical]  // auto-generated
    internal sealed class SafeCertContextHandle : SafeHandleZeroOrMinusOneIsInvalid {
        private SafeCertContextHandle() : base (true) {}
 
        // 0 is an Invalid Handle
        internal SafeCertContextHandle(IntPtr handle) : base (true) {
            SetHandle(handle);
        }
 
        internal static SafeCertContextHandle InvalidHandle {
            get {
                SafeCertContextHandle invalidHandle = new SafeCertContextHandle(IntPtr.Zero);
                // There are no managed calls to replace the handle value on an instance of this type.
                // There are some CLR internals which can do so, and the direct callers of those CLR
                // methods should be aware of the possibility of needing to call ReRegisterForFinalize
                GC.SuppressFinalize(invalidHandle);
                return invalidHandle;
            }
        }
 
        internal IntPtr pCertContext {
            get {
                if (handle == IntPtr.Zero)
                    return IntPtr.Zero;
 
                return Marshal.ReadIntPtr(handle);
            }
        }
 
        // This method handles the case where pCert == NULL
        [ResourceExposure(ResourceScope.None)]
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        private static extern void _FreePCertContext(IntPtr pCert);
 
        [System.Security.SecurityCritical]
        override protected bool ReleaseHandle()
        {
            _FreePCertContext(handle);
            return true;
        }
    }
 
    [System.Security.SecurityCritical]  // auto-generated
    internal sealed class SafeCertStoreHandle : SafeHandleZeroOrMinusOneIsInvalid {
        private SafeCertStoreHandle() : base (true) {}
 
        // 0 is an Invalid Handle
        internal SafeCertStoreHandle(IntPtr handle) : base (true) {
            SetHandle(handle);
        }
 
        internal static SafeCertStoreHandle InvalidHandle {
            get {
                SafeCertStoreHandle invalidHandle = new SafeCertStoreHandle(IntPtr.Zero);
                // There are no managed calls to replace the handle value on an instance of this type.
                // There are some CLR internals which can do so, and the direct callers of those CLR
                // methods should be aware of the possibility of needing to call ReRegisterForFinalize
                GC.SuppressFinalize(invalidHandle);
                return invalidHandle;
            }
        }
 
        // This method handles the case where hCertStore == NULL
        [ResourceExposure(ResourceScope.None)]
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        private static extern void _FreeCertStoreContext(IntPtr hCertStore);
 
        [System.Security.SecurityCritical]
        override protected bool ReleaseHandle()
        {
            _FreeCertStoreContext(handle);
            return true;
        }
    }
}