Enhanced SIM for E2AP v1 for TS UC

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

diff --git a/e2sim/e2apv1sim/src/ASN1/asn/utility.hpp b/e2sim/e2apv1sim/src/ASN1/asn/utility.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
+#include <new>
+#include <memory>
+
+// Local Includes: Application specific classes, functions, and libraries
+
+namespace asn
+{
+
+struct allocator
+{
+       allocator() = default;
+
+       allocator(void* data, size_t size) { reset(data, size); }
+
+       template <typename T, std::size_t SZ>
+       explicit allocator(T (&buf)[SZ]) : allocator(buf, SZ * sizeof(T)) { }
+
+       void reset(void* data, size_t size)
+       {
+               std::size_t space = size;
+               m_begin = static_cast<uint8_t*>(std::align(alignment, size, data, space));
+               m_end = m_begin ? m_begin + space : nullptr;
+               m_current = m_begin;
+               m_ref_counter = 0;
+       }
+
+       uint8_t* alloc_bytes(std::size_t size)
+       {
+               std::size_t const esize = (size + alignment - 1) & -alignment;
+               if (m_current + esize > m_end) { return nullptr; } //throw std::bad_alloc();
+
+               uint8_t* const rval = m_current;
+               m_current += esize;
+               return rval;
+       }
+
+       size_t add_ref() { return ++m_ref_counter; }
+       size_t release()
+       {
+               if (m_ref_counter) --m_ref_counter;
+               if (m_ref_counter == 0) reset();
+               return m_ref_counter;
+       }
+       size_t ref_counter() const { return m_ref_counter; }
+private:
+       //called by last release() when m_ref_counter becomes 0
+       void reset()
+       {
+               m_current = m_begin;
+       }
+
+
+       enum : std::size_t
+       {
+               alignment = alignof(std::size_t)
+       };
+
+       uint8_t* m_begin { nullptr };           //set in reset()
+       uint8_t* m_current { nullptr };         //changed by alloc_bytes
+       uint8_t* m_end { nullptr };
+
+       size_t m_ref_counter {0};
+};
+
+} //namespace asn
+