+#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"
+
+namespace asn {
+namespace per {
+
+/********************************************************************************
+VisitorEncoder
+*********************************************************************************/
+struct VisitorEncoder
+{
+ explicit VisitorEncoder(EncoderCtx& ctx) : m_ctx(ctx) {}
+
+ template <typename IE>
+ bool operator() (IE const& ie) const
+ {
+ Element<IE, IE::ie_type>::run(ie, m_ctx);
+ return static_cast<bool>(m_ctx);
+ }
+ EncoderCtx& m_ctx;
+};
+
+/********************************************************************************
+VisitorDecoder
+*********************************************************************************/
+struct VisitorDecoder
+{
+ VisitorDecoder(DecoderCtx& ctx) : m_ctx(ctx) {}
+
+ template <typename IE>
+ bool operator() (IE& ie) const
+ {
+ Element<IE, IE::ie_type>::run(ie, m_ctx);
+ return static_cast<bool>(m_ctx);
+ }
+ DecoderCtx& m_ctx;
+};
+
+/***************************************************************************************
+* Open Type Visitor // Encode Open Type (10.2)
+***************************************************************************************/
+struct OpenTypeVisitorEncoder
+{
+ explicit OpenTypeVisitorEncoder(EncoderCtx& ctx) : m_ctx(ctx) {}
+
+ template <typename IE>
+ bool operator() (IE const& ie) const
+ {
+ size_t reserved_size = 1; //1 byte length is most likely
+ Tools::bit_accessor::padByte(m_ctx.refBuffer());
+
+ if (m_ctx.refBuffer().getBytesLeft())
+ {
+ EncoderCtx::buf_type::pointer p = m_ctx.refBuffer().advance(reserved_size);
+ EncoderCtx::buf_type::pointer start = p + reserved_size;
+
+ Element<IE, IE::ie_type>::run(ie, m_ctx);
+
+ if (m_ctx)
+ {
+ Tools::bit_accessor::padByte(m_ctx.refBuffer());
+ EncoderCtx::buf_type::pointer p_new = m_ctx.refBuffer().begin();
+ size_t size = p_new - start;
+ size_t needed = LengthDeterminantDefault::bytes_needed(size) - reserved_size;
+ if (needed) //1 byte is not enough for the length determinant. it is hardly possible
+ {
+ if (m_ctx.refBuffer().getBytesLeft() < needed) {
+ m_ctx.refErrorCtx().lengthErrorBytes(m_ctx.refBuffer().getBytesLeft(), needed);
+ return false;
+ }
+ memmove(start + needed, start, size);
+ p_new += needed;
+ }
+ m_ctx.refBuffer().set_begin(p, 0);
+ LengthDeterminantDefault::run(m_ctx, size);
+ if (m_ctx) {
+ m_ctx.refBuffer().set_begin(p_new, 0);
+ Tools::bit_accessor::padByte(m_ctx.refBuffer());
+ }
+ }
+ }
+ else
+ {
+ m_ctx.refErrorCtx().lengthErrorBytes(m_ctx.refBuffer().getBytesLeft(), reserved_size);
+ }
+ return static_cast<bool>(m_ctx);
+ }
+ EncoderCtx& m_ctx;
+};
+
+/***************************************************************************************
+* Open Type Visitor // Decode Open Type (10.2)
+***************************************************************************************/
+struct OpenTypeVisitorDecoder
+{
+ explicit OpenTypeVisitorDecoder(DecoderCtx& ctx) : m_ctx(ctx) {}
+
+ template <typename IE>
+ bool operator() (IE& ie) const
+ {
+ size_t size = LengthDeterminantDefault::run(m_ctx);
+ DecoderCtx::buf_type& buffer = m_ctx.refBuffer();
+ if (buffer.getBytesLeft() < size)
+ {
+ m_ctx.refErrorCtx().lengthErrorBytes(buffer.getBytesLeft(), size);
+ return false;
+ }
+ DecoderCtx::buf_type::pointer end = buffer.end();
+ buffer.set_end(buffer.begin() + size);
+ Element<IE, IE::ie_type>::run(ie, m_ctx);
+ buffer.set_end(end);
+
+ return static_cast<bool>(m_ctx);
+ }
+ DecoderCtx& m_ctx;
+};
+
+} //namespace per
+} //namespace asn