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108 lines
3.8 KiB
108 lines
3.8 KiB
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <cstdint>
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#include <forward_list>
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#include <iterator>
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#include <memory>
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#include <vector>
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#include "os/log.h"
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#include "packet/bit_inserter.h"
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#include "packet/custom_field_fixed_size_interface.h"
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namespace bluetooth {
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namespace packet {
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// Abstract base class that is subclassed to provide insert() functions.
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// The template parameter little_endian controls the generation of insert().
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template <bool little_endian>
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class EndianInserter {
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public:
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EndianInserter() = default;
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virtual ~EndianInserter() = default;
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protected:
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// Write sizeof(FixedWidthPODType) bytes using the iterator
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template <typename FixedWidthPODType, typename std::enable_if<std::is_pod<FixedWidthPODType>::value, int>::type = 0>
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void insert(FixedWidthPODType value, BitInserter& it) const {
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uint8_t* raw_bytes = (uint8_t*)&value;
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for (size_t i = 0; i < sizeof(FixedWidthPODType); i++) {
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if (little_endian == true) {
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it.insert_byte(raw_bytes[i]);
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} else {
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it.insert_byte(raw_bytes[sizeof(FixedWidthPODType) - i - 1]);
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}
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}
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}
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// Write sizeof(FixedWidthCustomType) bytes using the iterator
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template <
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typename T,
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typename std::enable_if<std::is_base_of<CustomFieldFixedSizeInterface<T>, T>::value, int>::type = 0>
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void insert(const T& value, BitInserter& it) const {
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auto* raw_bytes = value.data();
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for (size_t i = 0; i < CustomFieldFixedSizeInterface<T>::length(); i++) {
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if (little_endian == true) {
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it.insert_byte(raw_bytes[i]);
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} else {
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it.insert_byte(raw_bytes[CustomFieldFixedSizeInterface<T>::length() - i - 1]);
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}
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}
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}
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// Write num_bits bits using the iterator
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template <typename FixedWidthIntegerType,
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typename std::enable_if<std::is_pod<FixedWidthIntegerType>::value, int>::type = 0>
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void insert(FixedWidthIntegerType value, BitInserter& it, size_t num_bits) const {
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ASSERT(num_bits <= (sizeof(FixedWidthIntegerType) * 8));
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for (size_t i = 0; i < num_bits / 8; i++) {
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if (little_endian == true) {
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it.insert_byte(static_cast<uint8_t>(value >> (i * 8)));
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} else {
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it.insert_byte(static_cast<uint8_t>(value >> (((num_bits / 8) - i - 1) * 8)));
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}
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}
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if (num_bits % 8) {
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it.insert_bits(static_cast<uint8_t>(value >> ((num_bits / 8) * 8)), num_bits % 8);
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}
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}
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// Specialized insert that allows inserting enums without casting
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template <typename Enum, typename std::enable_if<std::is_enum_v<Enum>, int>::type = 0>
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inline void insert(Enum value, BitInserter& it) const {
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using enum_type = typename std::underlying_type_t<Enum>;
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static_assert(std::is_unsigned_v<enum_type>, "Enum type is signed. Did you forget to specify the enum size?");
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insert<enum_type>(static_cast<enum_type>(value), it);
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}
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// Write a vector of FixedWidthIntegerType using the iterator
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template <typename FixedWidthIntegerType>
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void insert_vector(const std::vector<FixedWidthIntegerType>& vec, BitInserter& it) const {
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static_assert(std::is_pod<FixedWidthIntegerType>::value,
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"EndianInserter::insert requires a vector with elements of a fixed-size.");
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for (const auto& element : vec) {
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insert(element, it);
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}
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}
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};
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} // namespace packet
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} // namespace bluetooth
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