Code cleanup. Avoid std::string temporaries.

src/DHTMessage.cc

@@ -62,7 +62,7 @@ void DHTMessage::generateTransactionID()
 {
   unsigned char tid[DHT_TRANSACTION_ID_LENGTH];
   util::generateRandomData(tid, DHT_TRANSACTION_ID_LENGTH);
-  transactionID_ = std::string(&tid[0], &tid[DHT_TRANSACTION_ID_LENGTH]);
+  transactionID_.assign(&tid[0], &tid[DHT_TRANSACTION_ID_LENGTH]);
 }
 
 } // namespace aria2

src/DefaultExtensionMessageFactory.cc

@@ -137,7 +137,7 @@ DefaultExtensionMessageFactory::createMessage(const unsigned char* data, size_t
           (new UTMetadataDataExtensionMessage(extensionMessageID));
         m->setIndex(index->i());
         m->setTotalSize(totalSize->i());
-        m->setData(std::string(&data[1+end], &data[length]));
+        m->setData(&data[1+end], &data[length]);
         m->setUTMetadataRequestTracker(tracker_);
         m->setPieceStorage(dctx_->getOwnerRequestGroup()->getPieceStorage());
         m->setDownloadContext(dctx_);

src/DownloadEngine.cc

@@ -99,7 +99,7 @@ DownloadEngine::DownloadEngine(const SharedHandle<EventPoll>& eventPoll)
 {
   unsigned char sessionId[20];
   util::generateRandomKey(sessionId);
-  sessionId_ = std::string(&sessionId[0], & sessionId[sizeof(sessionId)]);
+  sessionId_.assign(&sessionId[0], & sessionId[sizeof(sessionId)]);
 }
 
 DownloadEngine::~DownloadEngine() {

src/File.cc

@@ -144,7 +144,7 @@ bool File::mkdirs() {
       continue;
     }
 #endif // __MINGW32__
-    std::string dir = std::string(begin, j);
+    std::string dir(begin, j);
     A2_LOG_DEBUG(fmt("Making directory %s", dir.c_str()));
     if(File(dir).isDir()) {
       A2_LOG_DEBUG(fmt("%s exists and is a directory.", dir.c_str()));

src/PeerReceiveHandshakeCommand.cc

@@ -100,7 +100,7 @@ bool PeerReceiveHandshakeCommand::executeInternal()
   if(peerConnection_->getBufferLength() >= 48) {
     const unsigned char* data = peerConnection_->getBuffer();
     // check info_hash
-    std::string infoHash = std::string(&data[28], &data[28+INFO_HASH_LENGTH]);
+    std::string infoHash(&data[28], &data[28+INFO_HASH_LENGTH]);
 
     SharedHandle<DownloadContext> downloadContext =
       getDownloadEngine()->getBtRegistry()->getDownloadContext(infoHash);

src/RequestGroup.cc

@@ -1183,15 +1183,15 @@ DownloadResultHandle RequestGroup::createDownloadResult() const
   res->uploadLength = st.getAllTimeUploadLength();
   if(pieceStorage_) {
     if(pieceStorage_->getBitfieldLength() > 0) {
-      res->bitfield = std::string(pieceStorage_->getBitfield(),
+      res->bitfield.assign(pieceStorage_->getBitfield(),
-                                  pieceStorage_->getBitfield()+
+                           pieceStorage_->getBitfield()+
-                                  pieceStorage_->getBitfieldLength());
+                           pieceStorage_->getBitfieldLength());
     }
   }
 #ifdef ENABLE_BITTORRENT
   if(downloadContext_->hasAttribute(bittorrent::BITTORRENT)) {
     const unsigned char* p = bittorrent::getInfoHash(downloadContext_);
-    res->infoHash = std::string(p, p+INFO_HASH_LENGTH);
+    res->infoHash.assign(p, p+INFO_HASH_LENGTH);
   }
 #endif // ENABLE_BITTORRENT
   res->pieceLength = downloadContext_->getPieceLength();

src/SocketCore.cc

@@ -1141,7 +1141,8 @@ void getInterfaceAddress
       } else {
         continue;
       }
-      if(std::string(ifa->ifa_name) == iface) {
+      if(util::streq(iface.begin(), iface.end(),
+                     ifa->ifa_name, ifa->ifa_name+strlen(ifa->ifa_name))) {
         socklen_t bindAddrLen =
           iffamily == AF_INET ? sizeof(sockaddr_in) : sizeof(sockaddr_in6);
         sockaddr_union bindAddr;

src/UTMetadataDataExtensionMessage.h

@@ -77,6 +77,12 @@ public:
 
   void setData(const std::string& data);
 
+  template<typename InputIterator>
+  void setData(InputIterator first, InputIterator last)
+  {
+    data_.assign(first, last);
+  }
+
   const std::string& getData() const
   {
     return data_;

src/UTMetadataRequestExtensionMessage.cc

@@ -93,7 +93,7 @@ void UTMetadataRequestExtensionMessage::doReceivedAction()
       (getIndex()+1)*METADATA_PIECE_SIZE <= attrs->metadata.size()?
       attrs->metadata.begin()+(getIndex()+1)*METADATA_PIECE_SIZE:
       attrs->metadata.end();
-    m->setData(std::string(begin, end));
+    m->setData(begin, end);
     SharedHandle<BtMessage> msg = messageFactory_->createBtExtendedMessage(m);
     dispatcher_->addMessageToQueue(msg);
   } else {

src/XML2SAXMetalinkProcessor.cc

@@ -86,7 +86,7 @@ void mlStartElement
     }
     const char* valueBegin = reinterpret_cast<const char*>(attrs[index+3]);
     const char* valueEnd = reinterpret_cast<const char*>(attrs[index+4]);
-    xmlAttr.value = std::string(valueBegin, valueEnd);
+    xmlAttr.value.assign(valueBegin, valueEnd);
     xmlAttrs.push_back(xmlAttr);
   }
   assert(srcLocalname);

src/Xml2XmlRpcRequestProcessor.cc

@@ -78,7 +78,7 @@ void mlStartElement(void* userData, const xmlChar* name,
   }
   sd->stm_->beginElement(reinterpret_cast<const char*>(name), attrmap);
   if(sd->stm_->needsCharactersBuffering()) {
-    sd->charactersStack_.push(std::string());
+    sd->charactersStack_.push(A2STR::NIL);
   }
 }
 } // namespace

src/bittorrent_helper.cc

@@ -426,7 +426,7 @@ void processRootDictionary
                          MessageDigest::sha1(),
                          encodedInfoDict.data(),
                          encodedInfoDict.size());
-  torrent->infoHash = std::string(&infoHash[0], &infoHash[INFO_HASH_LENGTH]);
+  torrent->infoHash.assign(&infoHash[0], &infoHash[INFO_HASH_LENGTH]);
   torrent->metadata = encodedInfoDict;
   torrent->metadataSize = encodedInfoDict.size();
 

src/cookie_helper.cc

@@ -299,7 +299,7 @@ bool parse
       if(noDot == end) {
         return false;
       }
-      cookieDomain = std::string(noDot, end);
+      cookieDomain.assign(noDot, end);
     } else if(attrName == "path") {
       if(goodPath(attrp.first, attrp.second)) {
         cookiePath.assign(attrp.first, attrp.second);

src/util.cc

@@ -728,7 +728,7 @@ void parseParam(OutputIterator out, const std::string& header)
     std::string param;
     if(paramLast == eoi || *paramLast == ';') {
       // No value, parmname only
-      param = std::string(paramFirst, paramLast);
+      param.assign(paramFirst, paramLast);
     } else {
       for(; paramLast != eoi && *paramLast != '"' && *paramLast != ';';
           ++paramLast);
@@ -739,10 +739,10 @@ void parseParam(OutputIterator out, const std::string& header)
         if(paramLast != eoi) {
           ++paramLast;
         }
-        param = std::string(paramFirst, paramLast);
+        param.assign(paramFirst, paramLast);
         for(; paramLast != eoi && *paramLast != ';'; ++paramLast);
       } else {
-        param = std::string(paramFirst, paramLast);
+        param.assign(paramFirst, paramLast);
       }
     }
     param = strip(param);
@@ -1509,7 +1509,7 @@ void executeHook
   if(batch) {
     const char* p = getenv("windir");
     if(p) {
-      cmdexe = std::string(p);
+      cmdexe = p;
       cmdexe += "\\system32\\cmd.exe";
     } else {
       A2_LOG_INFO("Failed to get windir environment variable."