Enhanced SIM for E2AP v1 for TS UC

[sim/e2-interface.git] / e2sim / e2apv1sim / src / ASN1 / asn / per / choice.hpp

diff --git a/e2sim/e2apv1sim/src/ASN1/asn/per/choice.hpp b/e2sim/e2apv1sim/src/ASN1/asn/per/choice.hpp
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+#pragma once
+/******************************************************************************
+*
+*   Copyright (c) 2019 AT&T Intellectual Property.
+*   Copyright (c) 2018-2019 Nokia.
+*
+*   Licensed under the Apache License, Version 2.0 (the "License");
+*   you may not use this file except in compliance with the License.
+*   You may obtain a copy of the License at
+*
+*       http://www.apache.org/licenses/LICENSE-2.0
+*
+*   Unless required by applicable law or agreed to in writing, software
+*   distributed under the License is distributed on an "AS IS" BASIS,
+*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*   See the License for the specific language governing permissions and
+*   limitations under the License.
+*
+******************************************************************************/
+
+// Standard Includes: ANSI C/C++, MSA, and Third-Party Libraries
+
+// Local Includes: Application specific classes, functions, and libraries
+#include "asn/per/common.hpp"
+#include "asn/per/visitor.hpp"
+
+namespace asn {
+namespace per {
+
+/********************************************************************************
+Choice
+*********************************************************************************/
+
+/**************************************************/
+//22.6-7 Default
+template <class IE, class Enabler = void>
+struct ChoiceNoExt
+{
+       static void inline run(IE const& ie, EncoderCtx& ctx)
+       {
+               ConstrainedWholeNumber<typename IE::constraint_t, typename IE::index_type>::run(ctx, IE::normalize(ie.get_index()));
+               VisitorEncoder ve{ ctx };
+               ie.encode(ve);
+       }
+       static void inline run(IE& ie, DecoderCtx& ctx)
+       {
+               typename IE::index_type idx = ConstrainedWholeNumber<typename IE::constraint_t, typename IE::index_type>::run(ctx);
+               VisitorDecoder ve{ ctx };
+               ie.decode(IE::denormalize(idx), ve);
+       }
+};
+
+//22.4 One alternative 
+template <class IE>
+struct ChoiceNoExt<IE, std::enable_if_t<(IE::constraint_t::upper_bound == 0)> >
+{
+       static void inline run(IE const& ie, EncoderCtx& ctx)
+       {
+               VisitorEncoder ve{ ctx };
+               ie.encode(ve);
+       }
+       static void inline run(IE& ie, DecoderCtx& ctx)
+       {
+               VisitorDecoder ve{ ctx };
+               ie.decode(IE::denormalize(0), ve);
+       }
+};
+
+/**************************************************/
+
+template <class IE, class Enable = void>
+struct Choice;
+
+//22.5 Extension present
+template <class IE>
+struct Choice<IE, std::enable_if_t<(IE::constraint_t::extended == true)> >
+{
+       static void inline run(IE const& ie, EncoderCtx& ctx)
+       {
+               auto idx = IE::normalize(ie.get_index());
+               if (idx <= IE::constraint_t::upper_bound)
+               {
+                       Tools::bit_accessor::put(0, 1, ctx.refBuffer());
+                       ChoiceNoExt<IE>::run(ie, ctx);
+               }
+               else
+               {
+                       Tools::bit_accessor::put(1, 1, ctx.refBuffer());
+                       NormallySmallNonnegativeBinaryInteger<IE>::run(ie, ctx, idx - IE::constraint_t::upper_bound - 1);
+                       OpenTypeVisitorEncoder ve{ ctx };
+                       ie.encode(ve);
+               }
+       }
+       static void inline run(IE& ie, DecoderCtx& ctx)
+       {
+               u8 ext = Tools::bit_accessor::get(1, ctx.refBuffer());
+               if (ext)
+               {
+                       typename IE::index_type idx = IE::constraint_t::upper_bound + 1 + NormallySmallNonnegativeBinaryInteger<IE, typename IE::index_type>::run(ctx);
+                       if (idx >= IE::constraint_t::total_num_entries)
+                       {
+                               ie.set_unknown();
+                               size_t size = LengthDeterminantDefault::run(ctx);
+                               DecoderCtx::buf_type& buffer = ctx.refBuffer();
+                               if (buffer.getBytesLeft() < size)
+                                       ctx.refErrorCtx().lengthErrorBytes(buffer.getBytesLeft(), size);
+                               else
+                                       buffer.advance(size);
+                       }
+                       else
+                       {
+                               OpenTypeVisitorDecoder ve{ ctx };
+                               ie.decode(IE::denormalize(idx), ve);
+                       }
+               }
+               else
+                       ChoiceNoExt<IE>::run(ie, ctx);
+       }
+};
+
+//22.6 No extension
+template <class IE>
+struct Choice<IE, std::enable_if_t<(IE::constraint_t::extended == false)> >
+{
+       static void inline run(IE const& ie, EncoderCtx& ctx)
+       {
+               ChoiceNoExt<IE>::run(ie, ctx);
+       }
+       static void inline run(IE& ie, DecoderCtx& ctx)
+       {
+               ChoiceNoExt<IE>::run(ie, ctx);
+       }
+};
+
+} //namespace per
+} //namespace asn