Switch DirectoryControl to use AsnWriter, AsnDecoder

src/libraries/Common/src/Interop/Linux/OpenLdap/Interop.Ldap.cs

@@ -221,9 +221,6 @@ internal static partial int ldap_sasl_interactive_bind(
         [LibraryImport(Libraries.OpenLdap, EntryPoint = "ldap_first_reference")]
         public static partial IntPtr ldap_first_reference(ConnectionHandle ldapHandle, IntPtr result);
 
-        [LibraryImport(Libraries.OpenLdap, EntryPoint = "ldap_create_sort_control")]
-        public static partial int ldap_create_sort_control(ConnectionHandle handle, IntPtr keys, byte critical, ref IntPtr control);
-
         [LibraryImport(Libraries.OpenLdap, EntryPoint = "ldap_control_free")]
         public static partial int ldap_control_free(IntPtr control);
 

src/libraries/Common/src/Interop/Windows/Wldap32/Interop.Ldap.cs

@@ -186,10 +186,6 @@ internal static partial class Ldap
         [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
         public static partial int ldap_parse_reference(ConnectionHandle ldapHandle, IntPtr result, ref IntPtr referrals);
 
-        [LibraryImport(Libraries.Wldap32, EntryPoint = "ldap_create_sort_controlW")]
-        [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
-        public static partial int ldap_create_sort_control(ConnectionHandle handle, IntPtr keys, byte critical, ref IntPtr control);
-
         [LibraryImport(Libraries.Wldap32, EntryPoint = "ldap_control_freeW")]
         [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
         public static partial int ldap_control_free(IntPtr control);

src/libraries/System.DirectoryServices.Protocols/src/System.DirectoryServices.Protocols.csproj

@@ -26,6 +26,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' != ''">
+    <Compile Include="System\DirectoryServices\Protocols\common\AsnWriterExtensions.cs" />
     <Compile Include="System\DirectoryServices\Protocols\common\AuthTypes.cs" />
     <Compile Include="System\DirectoryServices\Protocols\common\BerConverter.cs" />
     <Compile Include="System\DirectoryServices\Protocols\common\DereferenceAlias.cs" />
@@ -51,7 +52,6 @@
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapPartialResultsProcessor.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapSessionOptions.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\SafeHandles.cs" />
-    <Compile Include="System\DirectoryServices\Protocols\Interop\SortKeyInterop.cs" />
 
     <Compile Include="$(CommonPath)DisableRuntimeMarshalling.cs" Link="Common\DisableRuntimeMarshalling.cs" />
     <Compile Include="$(CommonPath)Interop\Interop.Ldap.cs" Link="Common\Interop\Interop.Ldap.cs" />
@@ -64,7 +64,6 @@
     <Compile Include="System\DirectoryServices\Protocols\common\QuotaControl.Windows.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\LdapPal.Windows.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\BerPal.Windows.cs" />
-    <Compile Include="System\DirectoryServices\Protocols\Interop\SortKeyInterop.Windows.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapConnection.Windows.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapSessionOptions.Windows.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\SafeHandles.Windows.cs" />
@@ -79,7 +78,6 @@
     <Compile Include="System\DirectoryServices\Protocols\common\QuotaControl.Linux.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\LdapPal.Linux.cs" />
     <Compile Include="System\DirectoryServices\Protocols\Interop\BerPal.Linux.cs" />
-    <Compile Include="System\DirectoryServices\Protocols\Interop\SortKeyInterop.Linux.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapConnection.Linux.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LdapSessionOptions.Linux.cs" />
     <Compile Include="System\DirectoryServices\Protocols\ldap\LocalAppContextSwitches.cs" />

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/Interop/LdapPal.Linux.cs

@@ -19,8 +19,6 @@ internal static int CompareDirectoryEntries(ConnectionHandle ldapHandle, string
 
         internal static void FreeDirectoryControls(IntPtr value) => Interop.Ldap.ldap_controls_free(value);
 
-        internal static int CreateDirectorySortControl(ConnectionHandle handle, IntPtr keys, byte critical, ref IntPtr control) => Interop.Ldap.ldap_create_sort_control(handle, keys, critical, ref control);
-
         internal static int DeleteDirectoryEntry(ConnectionHandle ldapHandle, string dn, IntPtr servercontrol, IntPtr clientcontrol, ref int messageNumber) => Interop.Ldap.ldap_delete_ext(ldapHandle, dn, servercontrol, clientcontrol, ref messageNumber);
 
         internal static int ExtendedDirectoryOperation(ConnectionHandle ldapHandle, string oid, BerVal data, IntPtr servercontrol, IntPtr clientcontrol, ref int messageNumber) =>

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/Interop/LdapPal.Windows.cs

@@ -19,8 +19,6 @@ internal static int CompareDirectoryEntries(ConnectionHandle ldapHandle, string
 
         internal static void FreeDirectoryControls(IntPtr value) => Interop.Ldap.ldap_controls_free(value);
 
-        internal static int CreateDirectorySortControl(ConnectionHandle handle, IntPtr keys, byte critical, ref IntPtr control) => Interop.Ldap.ldap_create_sort_control(handle, keys, critical, ref control);
-
         internal static int DeleteDirectoryEntry(ConnectionHandle ldapHandle, string dn, IntPtr servercontrol, IntPtr clientcontrol, ref int messageNumber) => Interop.Ldap.ldap_delete_ext(ldapHandle, dn, servercontrol, clientcontrol, ref messageNumber);
 
         internal static int ExtendedDirectoryOperation(ConnectionHandle ldapHandle, string oid, BerVal data, IntPtr servercontrol, IntPtr clientcontrol, ref int messageNumber) =>

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/common/AsnWriterExtensions.cs

@@ -0,0 +1,36 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Formats.Asn1;
+using System.Text;
+
+namespace System.DirectoryServices.Protocols
+{
+    internal static class AsnWriterExtensions
+    {
+        public static void WriteLdapString(this AsnWriter writer, string value, Encoding stringEncoding, bool mandatory = true, Asn1Tag? tag = null)
+        {
+            // A typical stack allocation threshold would be 256 bytes. A higher threshold has been chosen because an LdapString can be
+            // used to serialize server names. A server name is defined by RF1035, which specifies that a label in a domain name should
+            // be < 64 characters. If a server name is specified as an FQDN, this will be at least three labels in an AD environment -
+            // up to 192 characters. Doubling this to allow for Unicode encoding, then rounding to the nearest power of two yields 512.
+            const int StackAllocationThreshold = 512;
+
+            if (!string.IsNullOrEmpty(value))
+            {
+                int octetStringLength = stringEncoding.GetByteCount(value);
+                // Allocate space on the stack. There's a modest codegen advantage to a constant-value stackalloc.
+                Span<byte> tmpValue = octetStringLength <= StackAllocationThreshold
+                    ? stackalloc byte[StackAllocationThreshold].Slice(0, octetStringLength)
+                    : new byte[octetStringLength];
+
+                stringEncoding.GetBytes(value, tmpValue);
+                writer.WriteOctetString(tmpValue, tag);
+            }
+            else if (mandatory)
+            {
+                writer.WriteOctetString([], tag);
+            }
+        }
+    }
+}