X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?p=sim%2Fe2-interface.git;a=blobdiff_plain;f=e2sim%2Fe2apv1sim%2Fe2sim%2Fsrc%2FASN1%2Fasn%2Futility.hpp;fp=e2sim%2Fe2apv1sim%2Fe2sim%2Fsrc%2FASN1%2Fasn%2Futility.hpp;h=ae1ad748232dbfb8db2695cf95bd3a7c83360c0d;hp=0000000000000000000000000000000000000000;hb=3ebf932d23dcbec9ed19f4a51f9d00a0a54f5124;hpb=6896318f2b4ff01b4a88b16019c3dc93b0b693f5

diff --git a/e2sim/e2apv1sim/e2sim/src/ASN1/asn/utility.hpp b/e2sim/e2apv1sim/e2sim/src/ASN1/asn/utility.hpp
new file mode 100755
index 0000000..ae1ad74
--- /dev/null
+++ b/e2sim/e2apv1sim/e2sim/src/ASN1/asn/utility.hpp
@@ -0,0 +1,88 @@
+#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
+