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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* 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 <hicn/transport/interfaces/socket_consumer.h>
#include <hicn/transport/protocols/indexing_manager.h>
#include <hicn/transport/protocols/reassembly.h>
#include <hicn/transport/utils/array.h>
#include <hicn/transport/utils/membuf.h>
namespace transport {
namespace protocol {
BaseReassembly::BaseReassembly(interface::ConsumerSocket *icn_socket,
ContentReassembledCallback *content_callback)
: reassembly_consumer_socket_(icn_socket),
incremental_index_manager_(
std::make_unique<IncrementalIndexManager>(icn_socket)),
manifest_index_manager_(
std::make_unique<ManifestIndexManager>(icn_socket)),
index_manager_(incremental_index_manager_.get()),
index_(0),
read_buffer_(nullptr) {
setContentCallback(content_callback);
}
void BaseReassembly::reassemble(ContentObject::Ptr &&content_object) {
if (TRANSPORT_EXPECT_TRUE(content_object != nullptr)) {
received_packets_.emplace(std::make_pair(
content_object->getName().getSuffix(), std::move(content_object)));
}
auto it = received_packets_.find((const unsigned int)index_);
while (it != received_packets_.end()) {
if (it->second->getPayloadType() == PayloadType::CONTENT_OBJECT) {
copyContent(*it->second);
received_packets_.erase(it);
}
index_ = index_manager_->getNextReassemblySegment();
it = received_packets_.find((const unsigned int)index_);
}
}
void BaseReassembly::copyContent(const ContentObject &content_object) {
auto a = content_object.getPayload();
auto payload_length = a->length();
auto write_size = std::min(payload_length, read_buffer_->tailroom());
auto additional_bytes = payload_length > read_buffer_->tailroom()
? payload_length - read_buffer_->tailroom()
: 0;
std::memcpy(read_buffer_->writableTail(), a->data(), write_size);
read_buffer_->append(write_size);
if (!read_buffer_->tailroom()) {
notifyApplication();
std::memcpy(read_buffer_->writableTail(), a->data() + write_size,
additional_bytes);
read_buffer_->append(additional_bytes);
}
bool download_completed =
index_manager_->getFinalSuffix() == content_object.getName().getSuffix();
if (TRANSPORT_EXPECT_FALSE(download_completed)) {
notifyApplication();
content_callback_->onContentReassembled(std::make_error_code(std::errc(0)));
}
}
void BaseReassembly::notifyApplication() {
interface::ConsumerSocket::ReadCallback *read_callback = nullptr;
reassembly_consumer_socket_->getSocketOption(
interface::ConsumerCallbacksOptions::READ_CALLBACK, &read_callback);
if (TRANSPORT_EXPECT_FALSE(!read_callback)) {
TRANSPORT_LOGE("Read callback not installed!");
return;
}
if (read_callback->isBufferMovable()) {
// No need to perform an additional copy. The whole buffer will be
// tranferred to the application.
read_callback->readBufferAvailable(std::move(read_buffer_));
read_buffer_ = utils::MemBuf::create(read_callback->maxBufferSize());
} else {
// The buffer will be copied into the application-provided buffer
uint8_t *buffer;
std::size_t length;
std::size_t total_length = read_buffer_->length();
while (read_buffer_->length()) {
buffer = nullptr;
length = 0;
read_callback->getReadBuffer(&buffer, &length);
if (!buffer || !length) {
throw errors::RuntimeException(
"Invalid buffer provided by the application.");
}
auto to_copy = std::min(read_buffer_->length(), length);
std::memcpy(buffer, read_buffer_->data(), to_copy);
read_buffer_->trimStart(to_copy);
}
read_callback->readDataAvailable(total_length);
read_buffer_->clear();
}
}
void BaseReassembly::reset() {
manifest_index_manager_->reset();
incremental_index_manager_->reset();
index_ = index_manager_->getNextReassemblySegment();
received_packets_.clear();
// reset read buffer
interface::ConsumerSocket::ReadCallback *read_callback;
reassembly_consumer_socket_->getSocketOption(
interface::ConsumerCallbacksOptions::READ_CALLBACK, &read_callback);
read_buffer_ = utils::MemBuf::create(read_callback->maxBufferSize());
}
} // namespace protocol
} // namespace transport
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