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/*
* Copyright 2019 The Android Open Source Project
*
* 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.
*/
#include "packet/fragmenting_inserter.h"
#include "os/log.h"
namespace bluetooth {
namespace packet {
FragmentingInserter::FragmentingInserter(size_t mtu,
std::back_insert_iterator<std::vector<std::unique_ptr<RawBuilder>>> iterator)
: BitInserter(to_construct_bit_inserter_), mtu_(mtu), curr_packet_(std::make_unique<RawBuilder>(mtu)),
iterator_(iterator) {}
void FragmentingInserter::insert_bits(uint8_t byte, size_t num_bits) {
ASSERT(curr_packet_ != nullptr);
size_t total_bits = num_bits + num_saved_bits_;
uint16_t new_value = static_cast<uint8_t>(saved_bits_) | (static_cast<uint16_t>(byte) << num_saved_bits_);
if (total_bits >= 8) {
uint8_t new_byte = static_cast<uint8_t>(new_value);
on_byte(new_byte);
curr_packet_->AddOctets1(new_byte);
if (curr_packet_->size() >= mtu_) {
iterator_ = std::move(curr_packet_);
curr_packet_ = std::make_unique<RawBuilder>(mtu_);
}
total_bits -= 8;
new_value = new_value >> 8;
}
num_saved_bits_ = total_bits;
uint8_t mask = static_cast<uint8_t>(0xff) >> (8 - num_saved_bits_);
saved_bits_ = static_cast<uint8_t>(new_value) & mask;
}
void FragmentingInserter::finalize() {
if (curr_packet_->size() != 0) {
iterator_ = std::move(curr_packet_);
}
curr_packet_.reset();
}
} // namespace packet
} // namespace bluetooth
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