SafeFreeContextBuffer.cs

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using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
 
namespace System.Net.Security;
 
internal abstract class SafeFreeContextBuffer : SafeHandleZeroOrMinusOneIsInvalid
{
    protected SafeFreeContextBuffer()
        : base(ownsHandle: true)
    {
    }
 
    internal void Set(IntPtr value)
    {
        handle = value;
    }
 
    internal static int EnumeratePackages(out int pkgnum, out SafeFreeContextBuffer pkgArray)
    {
        int num = -1;
        SafeFreeContextBuffer_SECURITY safeFreeContextBuffer_SECURITY = null;
        num = global::Interop.SspiCli.EnumerateSecurityPackagesW(out pkgnum, out safeFreeContextBuffer_SECURITY);
        pkgArray = safeFreeContextBuffer_SECURITY;
        if (num != 0)
        {
            pkgArray?.SetHandleAsInvalid();
        }
        return num;
    }
 
    internal static SafeFreeContextBuffer CreateEmptyHandle()
    {
        return new SafeFreeContextBuffer_SECURITY();
    }
 
    public unsafe static int QueryContextAttributes(SafeDeleteContext phContext, global::Interop.SspiCli.ContextAttribute contextAttribute, byte* buffer, SafeHandle refHandle)
    {
        int num = -2146893055;
        try
        {
            bool success = false;
            phContext.DangerousAddRef(ref success);
            num = global::Interop.SspiCli.QueryContextAttributesW(ref phContext._handle, contextAttribute, buffer);
        }
        finally
        {
            phContext.DangerousRelease();
        }
        if (num == 0 && refHandle != null)
        {
            if (refHandle is SafeFreeContextBuffer)
            {
                ((SafeFreeContextBuffer)refHandle).Set(*(IntPtr*)buffer);
            }
            else
            {
                ((SafeFreeCertContext)refHandle).Set(*(IntPtr*)buffer);
            }
        }
        if (num != 0)
        {
            refHandle?.SetHandleAsInvalid();
        }
        return num;
    }
}