////  SendAssetTask.cpp//  assignment-client/src/assets////  Created by Ryan Huffman on 2015/08/26//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "SendAssetTask.h" #include <QFile> #include <DependencyManager.h>#include <NetworkLogging.h>#include <NLPacket.h>#include <NLPacketList.h>#include <NodeList.h>#include <udt/Packet.h> #include "AssetUtils.h" SendAssetTask::SendAssetTask(QSharedPointer<ReceivedMessage> message, const SharedNodePointer& sendToNode, const QDir& resourcesDir) :    QRunnable(),    _message(message),    _senderNode(sendToNode),    _resourcesDir(resourcesDir){    } void SendAssetTask::run() {    MessageID messageID;    DataOffset start, end;        _message->readPrimitive(&messageID);    QByteArray assetHash = _message->read(SHA256_HASH_LENGTH);     // `start` and `end` indicate the range of data to retrieve for the asset identified by `assetHash`.    // `start` is inclusive, `end` is exclusive. Requesting `start` = 1, `end` = 10 will retrieve 9 bytes of data,    // starting at index 1.    _message->readPrimitive(&start);    _message->readPrimitive(&end);        QString hexHash = assetHash.toHex();        qDebug() << "Received a request for the file (" << messageID << "): " << hexHash << " from " << start << " to " << end;        qDebug() << "Starting task to send asset: " << hexHash << " for messageID " << messageID;    auto replyPacketList = NLPacketList::create(PacketType::AssetGetReply, QByteArray(), true, true);     replyPacketList->write(assetHash);     replyPacketList->writePrimitive(messageID);     if (end <= start) {        replyPacketList->writePrimitive(AssetServerError::InvalidByteRange);    } else {        QString filePath = _resourcesDir.filePath(QString(hexHash));                QFile file { filePath };         if (file.open(QIODevice::ReadOnly)) {            if (file.size() < end) {                replyPacketList->writePrimitive(AssetServerError::InvalidByteRange);                qCDebug(networking) << "Bad byte range: " << hexHash << " " << start << ":" << end;            } else {                auto size = end - start;                file.seek(start);                replyPacketList->writePrimitive(AssetServerError::NoError);                replyPacketList->writePrimitive(size);                replyPacketList->write(file.read(size));                qCDebug(networking) << "Sending asset: " << hexHash;            }            file.close();        } else {            qCDebug(networking) << "Asset not found: " << filePath << "(" << hexHash << ")";            replyPacketList->writePrimitive(AssetServerError::AssetNotFound);        }    }     auto nodeList = DependencyManager::get<NodeList>();    nodeList->sendPacketList(std::move(replyPacketList), *_senderNode);}