--- /dev/null
+#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