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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/utils/array.h>
#include <hicn/transport/utils/membuf.h>
#include <implementation/socket_consumer.h>
#include <protocols/byte_stream_reassembly.h>
#include <protocols/errors.h>
#include <protocols/indexer.h>
#include <protocols/transport_protocol.h>
namespace transport {
namespace protocol {
using namespace core;
using ReadCallback = interface::ConsumerSocket::ReadCallback;
ByteStreamReassembly::ByteStreamReassembly(
implementation::ConsumerSocket *icn_socket,
TransportProtocol *transport_protocol)
: Reassembly(icn_socket, transport_protocol),
index_(IndexManager::invalid_index),
download_complete_(false) {}
void ByteStreamReassembly::reassemble(
std::unique_ptr<ContentObjectManifest> &&manifest) {
if (TRANSPORT_EXPECT_TRUE(manifest != nullptr) && read_buffer_->capacity()) {
received_packets_.emplace(
std::make_pair(manifest->getName().getSuffix(), nullptr));
assembleContent();
}
}
void ByteStreamReassembly::reassemble(ContentObject &content_object) {
if (TRANSPORT_EXPECT_TRUE(read_buffer_->capacity())) {
received_packets_.emplace(
std::make_pair(content_object.getName().getSuffix(),
content_object.shared_from_this()));
assembleContent();
}
}
void ByteStreamReassembly::assembleContent() {
if (TRANSPORT_EXPECT_FALSE(index_ == IndexManager::invalid_index)) {
index_ = index_manager_->getNextReassemblySegment();
if (index_ == IndexManager::invalid_index) {
return;
}
}
auto it = received_packets_.find((const unsigned int)index_);
while (it != received_packets_.end()) {
// Check if valid packet
if (it->second) {
if (TRANSPORT_EXPECT_FALSE(copyContent(*it->second))) {
return;
}
}
received_packets_.erase(it);
index_ = index_manager_->getNextReassemblySegment();
it = received_packets_.find((const unsigned int)index_);
}
if (!download_complete_ && index_ != IndexManager::invalid_index) {
transport_protocol_->onReassemblyFailed(index_);
}
}
bool ByteStreamReassembly::copyContent(ContentObject &content_object) {
bool ret = false;
content_object.trimStart(content_object.headerSize());
utils::MemBuf *current = &content_object;
do {
auto payload_length = current->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(), current->data(), write_size);
read_buffer_->append(write_size);
if (!read_buffer_->tailroom()) {
notifyApplication();
std::memcpy(read_buffer_->writableTail(), current->data() + write_size,
additional_bytes);
read_buffer_->append(additional_bytes);
}
current = current->next();
} while (current != &content_object);
download_complete_ =
index_manager_->getFinalSuffix() == content_object.getName().getSuffix();
if (TRANSPORT_EXPECT_FALSE(download_complete_)) {
ret = download_complete_;
notifyApplication();
transport_protocol_->onContentReassembled(
make_error_code(protocol_error::success));
}
return ret;
}
void ByteStreamReassembly::reInitialize() {
index_ = IndexManager::invalid_index;
download_complete_ = false;
received_packets_.clear();
// reset read buffer
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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