e2sim/e2apv1sim/src/ASN1/asn/ber/tools.hpp

   1 #pragma once
   2 /******************************************************************************
   3 *
   4 *   Copyright (c) 2019 AT&T Intellectual Property.
   5 *   Copyright (c) 2018-2019 Nokia.
   6 *
   7 *   Licensed under the Apache License, Version 2.0 (the "License");
   8 *   you may not use this file except in compliance with the License.
   9 *   You may obtain a copy of the License at
  10 *
  11 *       http://www.apache.org/licenses/LICENSE-2.0
  12 *
  13 *   Unless required by applicable law or agreed to in writing, software
  14 *   distributed under the License is distributed on an "AS IS" BASIS,
  15 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 *   See the License for the specific language governing permissions and
  17 *   limitations under the License.
  18 *
  19 ******************************************************************************/
  20
  21 // Standard Includes: ANSI C/C++, MSA, and Third-Party Libraries
  22
  23 // Local Includes: Application specific classes, functions, and libraries
  24
  25 namespace asn {
  26 namespace ber {
  27
  28 struct Tools
  29 {
  30         typedef bit_accessor_cross_byte<false> bit_accessor;
  31
  32
  33         template<typename T>
  34         static void put_bytes(T value, size_t length, EncoderCtx& ctx)
  35         {
  36                 auto & buffer = ctx.refBuffer();
  37
  38                 size_t shift = (length - 1) << 3;
  39                 for(size_t i = 0; i < length; ++i)
  40                 {
  41                         buffer.putByte(static_cast<uint8_t>(value >> shift));
  42                         shift -= 8;
  43                 }
  44         }
  45
  46         template<typename T>
  47         static void get_bytes(T& value, size_t length, DecoderCtx& ctx)
  48         {
  49                 auto & buffer = ctx.refBuffer();
  50
  51                 value = 0;
  52                 uint8_t const* data = buffer.getBytes(length);
  53
  54                 if(data)
  55                 {
  56                         value = data[0];
  57                         for(size_t i = 1; i < length; ++i)
  58                         {
  59                                 value <<= 8;
  60                                 value |= data[i];
  61                         }
  62                 }
  63         }
  64
  65 };
  66
  67 } //namespace ber
  68 } //namespace asn