make string type argument const string& where possible

src/AbstractDiskWriter.cc

@@ -59,7 +59,7 @@ void AbstractDiskWriter::closeFile() {
   }
 }
 
-void AbstractDiskWriter::openExistingFile(string filename) {
+void AbstractDiskWriter::openExistingFile(const string& filename) {
   File f(filename);
   if(!f.isFile()) {
     throw new DlAbortEx(EX_FILE_OPEN, filename.c_str(), "file not found");
@@ -70,7 +70,7 @@ void AbstractDiskWriter::openExistingFile(string filename) {
   }
 }
 
-void AbstractDiskWriter::createFile(string filename, int addFlags) {
+void AbstractDiskWriter::createFile(const string& filename, int addFlags) {
   // TODO proper filename handling needed
   assert(filename.size());
 //   if(filename.empty()) {

src/AbstractDiskWriter.h

@@ -35,7 +35,7 @@ protected:
   MessageDigestContext ctx;
 #endif // ENABLE_SHA1DIGEST
 
-  void createFile(string filename, int addFlags = 0);
+  void createFile(const string& filename, int addFlags = 0);
 
   void writeDataInternal(const char* data, int len);
   int readDataInternal(char* data, int len);
@@ -50,7 +50,7 @@ public:
 
   void closeFile();
 
-  void openExistingFile(string filename);
+  void openExistingFile(const string& filename);
 
   string sha1Sum(long long int offset, long long int length);
 

src/Base64.cc

@@ -60,8 +60,9 @@ string Base64::part_encode(const string& subplain)
   return crypted;
 }
 
-string Base64::encode(string plain)
+string Base64::encode(const string& plainSrc)
 {
+  string plain = plainSrc;
   int remainder = plain.size() % 3;
   if( remainder ) remainder = 3-remainder;
   for(int i = 0; i < remainder; ++i) plain += (char)0;
@@ -112,7 +113,7 @@ string Base64::part_decode(const string& subCrypted)
   return plain;
 }
 
-string Base64::decode(string crypted)
+string Base64::decode(const string& crypted)
 {
   string plain;
   int sIndex = 0;

src/Base64.h

@@ -32,8 +32,8 @@ private:
   static string part_decode(const string& subCrypted);
   static char getValue(char ch);
 public:
-  static string encode(string plain);
-  static string decode(string crypted);
+  static string encode(const string& plain);
+  static string decode(const string& crypted);
 };
 
 #endif // _BASE64_H_

src/ByteArrayDiskWriter.cc

@@ -42,12 +42,7 @@ void ByteArrayDiskWriter::init() {
   bufLength = 0;
 }
 
-void ByteArrayDiskWriter::reset() {
-  clear();
-  init();
-}
-
-void ByteArrayDiskWriter::initAndOpenFile(string filename) {
+void ByteArrayDiskWriter::initAndOpenFile(const string& filename) {
   openFile(filename);
 }
 
@@ -60,7 +55,7 @@ void ByteArrayDiskWriter::closeFile() {
   clear();
 }
 
-void ByteArrayDiskWriter::openExistingFile(string filename) {
+void ByteArrayDiskWriter::openExistingFile(const string& filename) {
   openFile(filename);
 }
 

src/ByteArrayDiskWriter.h

@@ -36,13 +36,13 @@ public:
   ByteArrayDiskWriter();
   virtual ~ByteArrayDiskWriter();
 
-  virtual void initAndOpenFile(string filename);
+  virtual void initAndOpenFile(const string& filename);
 
   virtual void openFile(const string& filename);
 
   virtual void closeFile();
 
-  virtual void openExistingFile(string filename);
+  virtual void openExistingFile(const string& filename);
 
   // position is ignored
   virtual void writeData(const char* data, int len, long long int position = 0);
@@ -56,7 +56,6 @@ public:
   int getByteArrayLength() const {
     return bufLength;
   }
-  void reset();
 };
 
 #endif // _D_BYTE_ARRAY_DISK_WRITER_H_

src/ConnectionException.h

@@ -27,7 +27,7 @@
 class ConnectionException:public DlAbortEx {
 public:
   ConnectionException():DlAbortEx() {}
-  ConnectionException(string msg):DlAbortEx() {}
+  ConnectionException(const string& msg):DlAbortEx() {}
 };
 
 #endif // _D_CONNECTION_EXCEPTION_H_

src/DefaultDiskWriter.cc

@@ -29,7 +29,7 @@ DefaultDiskWriter::DefaultDiskWriter(long long int totalLength):AbstractDiskWrit
 
 DefaultDiskWriter::~DefaultDiskWriter() {}
 
-void DefaultDiskWriter::initAndOpenFile(string filename) {
+void DefaultDiskWriter::initAndOpenFile(const string& filename) {
   createFile(filename);
   if(totalLength > 0) {
     ftruncate(fd, totalLength);

src/DefaultDiskWriter.h

@@ -32,7 +32,7 @@ public:
   DefaultDiskWriter(long long int totalLength);
   ~DefaultDiskWriter();
 
-  void initAndOpenFile(string filename);
+  void initAndOpenFile(const string& filename);
 };
 
 #endif // _D_DEFAULT_DISK_WRITER_H_

src/Dictionary.cc

@@ -34,7 +34,7 @@ void Dictionary::clearTable() {
   }
 }
 
-const MetaEntry* Dictionary::get(string name) const {
+const MetaEntry* Dictionary::get(const string& name) const {
   MetaTable::const_iterator itr = table.find(name);
   if(itr == table.end()) {
     return NULL;
@@ -43,7 +43,7 @@ const MetaEntry* Dictionary::get(string name) const {
   }
 }
 
-void Dictionary::put(string name, MetaEntry* entry) {
+void Dictionary::put(const string& name, MetaEntry* entry) {
   table[name] = entry;
   order.push_back(name);
 }

src/Dictionary.h

@@ -41,8 +41,8 @@ public:
   Dictionary();
   ~Dictionary();
 
-  const MetaEntry* get(string name) const;
-  void put(string name, MetaEntry* entry);
+  const MetaEntry* get(const string& name) const;
+  void put(const string& name, MetaEntry* entry);
 
   void accept(MetaEntryVisitor* v) const;
   const Order& getOrder() const;

src/Directory.cc

@@ -26,7 +26,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
-Directory::Directory(string name):name(name) {}
+Directory::Directory(const string& name):name(name) {}
 
 Directory::~Directory() {
   for(Files::iterator itr = files.begin(); itr != files.end(); itr++) {
@@ -34,7 +34,7 @@ Directory::~Directory() {
   }
 }
 
-void Directory::createDir(string parentDir, bool recursive) const {
+void Directory::createDir(const string& parentDir, bool recursive) const {
   string path = parentDir+"/"+name;
   File f(path);
   if(f.exists()) {

src/Directory.h

@@ -34,10 +34,10 @@ private:
   string name;
   Files files;
 public:
-  Directory(string name);
+  Directory(const string& name);
   ~Directory();
 
-  void createDir(string parentDir, bool recursive) const;
+  void createDir(const string& parentDir, bool recursive) const;
   void addFile(Directory* directory);
 };
 

src/DiskWriter.h

@@ -39,7 +39,7 @@ public:
    * If the file exists, then it is truncated to 0 length.
    * @param filename the file name to be opened.
    */
-  virtual void initAndOpenFile(string filename) = 0;
+  virtual void initAndOpenFile(const string& filename) = 0;
 
   virtual void openFile(const string& filename) = 0;
 
@@ -54,7 +54,7 @@ public:
    *
    * @param filename the file name to be opened.
    */
-  virtual void openExistingFile(string filename) = 0;
+  virtual void openExistingFile(const string& filename) = 0;
 
   /*
    * Writes len bytes from data to this binary stream at offset position.

src/DownloadCommand.h

@@ -42,7 +42,7 @@ public:
   DownloadCommand(int cuid, Request* req, DownloadEngine* e, const Socket* s);
   virtual ~DownloadCommand();
 
-  virtual TransferEncoding* getTransferEncoding(string transferEncoding) = 0;
+  virtual TransferEncoding* getTransferEncoding(const string& transferEncoding) = 0;
 
   string transferEncoding;
 

src/Exception.h

@@ -33,7 +33,7 @@ class Exception {
 private:
   string msg;
 protected:
-  void setMsg(string msgsrc, va_list ap) {
+  void setMsg(const string& msgsrc, va_list ap) {
     char buf[256];
     vsnprintf(buf, sizeof(buf), msgsrc.c_str(), ap);
     msg = buf;

src/File.cc

@@ -24,7 +24,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-File::File(string name):name(name) {}
+File::File(const string& name):name(name) {}
 
 File::~File() {}
 

src/File.h

@@ -35,7 +35,7 @@ private:
   string name;
   int fillStat(struct stat& fstat);
 public:
-  File(string name);
+  File(const string& name);
   ~File();
 
   /**

src/FileEntry.h

@@ -31,7 +31,7 @@ public:
   long long int offset;
   bool extracted;
   bool requested;
-  FileEntry(string path, long long int length, long long int offset):
+  FileEntry(const string& path, long long int length, long long int offset):
     path(path), length(length), offset(offset),
     extracted(false), requested(true) {}
   ~FileEntry() {}

src/FtpDownloadCommand.cc

@@ -33,6 +33,6 @@ FtpDownloadCommand::~FtpDownloadCommand() {
   }
 }
 
-TransferEncoding* FtpDownloadCommand::getTransferEncoding(string name) {
+TransferEncoding* FtpDownloadCommand::getTransferEncoding(const string& name) {
   return NULL;
 }

src/FtpDownloadCommand.h

@@ -31,7 +31,7 @@ public:
   FtpDownloadCommand(int cuid, Request* req, DownloadEngine* e, const Socket* dataSocket, const Socket* ctrlSocket);
   ~FtpDownloadCommand();
 
-  TransferEncoding* getTransferEncoding(string name);
+  TransferEncoding* getTransferEncoding(const string& name);
 };
 
 #endif // _D_FTP_DOWNLOAD_COMMAND_H_

src/HttpDownloadCommand.cc

@@ -46,6 +46,6 @@ HttpDownloadCommand::~HttpDownloadCommand() {
   }
 }
 
-TransferEncoding* HttpDownloadCommand::getTransferEncoding(string name) {
+TransferEncoding* HttpDownloadCommand::getTransferEncoding(const string& name) {
   return transferEncodings[name];
 }

src/HttpDownloadCommand.h

@@ -40,7 +40,7 @@ public:
   HttpDownloadCommand(int cuid, Request* req, DownloadEngine* e, const Socket* s);
   ~HttpDownloadCommand();
 
-  TransferEncoding* getTransferEncoding(string transferEncoding);
+  TransferEncoding* getTransferEncoding(const string& transferEncoding);
 };
 
 #endif // _D_HTTP_DOWNLOAD_COMMAND_H_

src/HttpResponseCommand.cc

@@ -84,7 +84,7 @@ void HttpResponseCommand::checkResponse(int status, const Segment& segment) {
   }
 }
 
-bool HttpResponseCommand::handleRedirect(string url, const HttpHeader& headers) {
+bool HttpResponseCommand::handleRedirect(const string& url, const HttpHeader& headers) {
   req->redirectUrl(url);
   logger->info(MSG_REDIRECT, cuid, url.c_str());
   e->noWait = true;
@@ -126,7 +126,7 @@ bool HttpResponseCommand::handleDefaultEncoding(const HttpHeader& headers) {
   }
 }
 
-bool HttpResponseCommand::handleOtherEncoding(string transferEncoding, const HttpHeader& headers) {
+bool HttpResponseCommand::handleOtherEncoding(const string& transferEncoding, const HttpHeader& headers) {
   // we ignore content-length when transfer-encoding is set
   e->segmentMan->downloadStarted = true;
   e->segmentMan->isSplittable = false;
@@ -139,7 +139,7 @@ bool HttpResponseCommand::handleOtherEncoding(string transferEncoding, const Htt
   return true;
 }
 
-void HttpResponseCommand::createHttpDownloadCommand(string transferEncoding) {
+void HttpResponseCommand::createHttpDownloadCommand(const string& transferEncoding) {
   
   HttpDownloadCommand* command = new HttpDownloadCommand(cuid, req, e, socket);
   TransferEncoding* enc = NULL;

src/HttpResponseCommand.h

@@ -28,10 +28,10 @@
 class HttpResponseCommand : public AbstractCommand {
 private:
   void checkResponse(int status, const Segment& segment);
-  bool handleRedirect(string url, const HttpHeader& headers);
+  bool handleRedirect(const string& url, const HttpHeader& headers);
   bool handleDefaultEncoding(const HttpHeader& headers);
-  bool handleOtherEncoding(string transferEncoding, const HttpHeader& headers);
-  void createHttpDownloadCommand(string transferEncoding = "");
+  bool handleOtherEncoding(const string& transferEncoding, const HttpHeader& headers);
+  void createHttpDownloadCommand(const string& transferEncoding = "");
   void retrieveCookie(const HttpHeader& headers);
   HttpConnection* http;
 protected:

src/MetaFileUtil.cc

@@ -26,7 +26,7 @@
 #include <string.h>
 #include <stdlib.h>
 
-MetaEntry* MetaFileUtil::parseMetaFile(string file) {
+MetaEntry* MetaFileUtil::parseMetaFile(const string& file) {
   File f(file);
   int len = f.size();
   char* buf = new char[len];

src/MetaFileUtil.h

@@ -43,7 +43,7 @@ private:
   static string decodeWordAsString(const char** pp, const char* end);
 
 public:
-  static MetaEntry* parseMetaFile(string file);
+  static MetaEntry* parseMetaFile(const string& file);
   static MetaEntry* bdecoding(const char* buf, int len);
 };
 

src/MultiDiskWriter.cc

@@ -61,7 +61,7 @@ void MultiDiskWriter::openFile(const string& filename) {
 }
 
 // filename is a directory which is specified by the user in the option.
-void MultiDiskWriter::initAndOpenFile(string filename) {
+void MultiDiskWriter::initAndOpenFile(const string& filename) {
   for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
       itr != diskWriterEntries.end(); itr++) {
     (*itr)->diskWriter->initAndOpenFile(filename+"/"+(*itr)->fileEntry.path);
@@ -75,7 +75,7 @@ void MultiDiskWriter::closeFile() {
   }
 }
 
-void MultiDiskWriter::openExistingFile(string filename) {
+void MultiDiskWriter::openExistingFile(const string& filename) {
   for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
       itr != diskWriterEntries.end(); itr++) {
     (*itr)->diskWriter->openExistingFile(filename+"/"+(*itr)->fileEntry.path);

src/MultiDiskWriter.h

@@ -60,9 +60,9 @@ public:
   void setFileEntries(const FileEntries& fileEntries);
 
   virtual void openFile(const string& filename);
-  virtual void initAndOpenFile(string filename);
+  virtual void initAndOpenFile(const string& filename);
   virtual void closeFile();
-  virtual void openExistingFile(string filename);
+  virtual void openExistingFile(const string& filename);
   virtual void writeData(const char* data, int len, long long int position = 0);
   virtual int readData(char* data, int len, long long int position);
   virtual string sha1Sum(long long int offset, long long int length);

src/PreAllocationDiskWriter.cc

@@ -33,7 +33,7 @@ PreAllocationDiskWriter::PreAllocationDiskWriter(long long int totalLength)
 
 PreAllocationDiskWriter::~PreAllocationDiskWriter() {}
 
-void PreAllocationDiskWriter::initAndOpenFile(string filename) {
+void PreAllocationDiskWriter::initAndOpenFile(const string& filename) {
   createFile(filename);
   int bufSize = 4096;
   char buf[4096];

src/PreAllocationDiskWriter.h

@@ -31,7 +31,7 @@ public:
   PreAllocationDiskWriter(long long int totalLength);
   ~PreAllocationDiskWriter();
 
-  void initAndOpenFile(string filename);
+  void initAndOpenFile(const string& filename);
 };
 
 #endif // _D_PRE_ALLOCATION_DISK_WRITER_H_

src/Request.cc

@@ -40,7 +40,7 @@ Request::~Request() {
   delete cookieBox;
 }
 
-bool Request::setUrl(string url) {
+bool Request::setUrl(const string& url) {
   this->url = url;
   return parseUrl(url);
 }
@@ -50,12 +50,12 @@ bool Request::resetUrl() {
   return setUrl(url);
 }
 
-bool Request::redirectUrl(string url) {
+bool Request::redirectUrl(const string& url) {
   previousUrl = currentUrl;
   return parseUrl(url);
 }
 
-bool Request::parseUrl(string url) {
+bool Request::parseUrl(const string& url) {
   currentUrl = url;
   host = "";
   port = 0;

src/Request.h

@@ -57,7 +57,7 @@ private:
   map<string, int> defaultPorts;
   int tryCount;
   int trackerEvent;
-  bool parseUrl(string url);
+  bool parseUrl(const string& url);
 public:
   Segment seg;
   CookieBox* cookieBox;
@@ -68,11 +68,11 @@ public:
 
   // Parses URL and sets url, host, port, dir, file fields.
   // Returns true if parsing goes successful, otherwise returns false.
-  bool setUrl(string url);
+  bool setUrl(const string& url);
   // Parses URL and sets host, port, dir, file fields.
   // url field are not altered by this method.
   // Returns true if parsing goes successful, otherwise returns false.
-  bool redirectUrl(string url);
+  bool redirectUrl(const string& url);
   bool resetUrl();
   void resetTryCount() { tryCount = 0; }
   void addTryCount() { tryCount++; }
@@ -83,7 +83,7 @@ public:
   string getCurrentUrl() const { return currentUrl; }
   string getPreviousUrl() const { return previousUrl; }
   string getReferer() const { return referer; }
-  void setReferer(string url) { referer = previousUrl = url; }
+  void setReferer(const string& url) { referer = previousUrl = url; }
   string getProtocol() const { return protocol; }
   string getHost() const { return host; }
   int getPort() const { return port; }

src/SegmentMan.cc

@@ -150,7 +150,7 @@ void SegmentMan::save() const {
   logger->info(MSG_SAVED_SEGMENT_FILE);
 }
 
-FILE* SegmentMan::openSegFile(string segFilename, string mode) const {
+FILE* SegmentMan::openSegFile(const string& segFilename, const string& mode) const {
   FILE* segFile = fopen(segFilename.c_str(), mode.c_str());
   if(segFile == NULL) {
     throw new DlAbortEx(strerror(errno));

src/SegmentMan.h

@@ -41,7 +41,7 @@ private:
   const Logger* logger;
 
   void read(FILE* file);
-  FILE* openSegFile(string segFilename, string mode) const;
+  FILE* openSegFile(const string& segFilename, const string& mode) const;
 public:
   /**
    * The total number of bytes to download.

src/Socket.cc

@@ -69,7 +69,7 @@ Socket* Socket::acceptConnection() const {
   return new Socket(core->acceptConnection());
 }
 
-void Socket::establishConnection(string host, int port) const {
+void Socket::establishConnection(const string& host, int port) const {
   core->establishConnection(host, port);
 }
 
@@ -93,7 +93,7 @@ void Socket::writeData(const char* data, int len, int timeout) const {
   core->writeData(data, len, timeout);
 }
 
-void Socket::writeData(string str, int timeout) const {
+void Socket::writeData(const string& str, int timeout) const {
   core->writeData(str.c_str(), str.size(), timeout);
 }
 

src/Socket.h

@@ -71,7 +71,7 @@ public:
   /**
    * @see SocketCore::establishConnection()
    */
-  void establishConnection(string host, int port) const;
+  void establishConnection(const string& host, int port) const;
 
   /**
    * @see SocketCore::setBlockingMode()
@@ -101,7 +101,7 @@ public:
    * A covenient function that can take string class parameter and
    * internally calls SocketCore::writeData().
    */
-  void writeData(string str, int timeout = 5) const;
+  void writeData(const string& str, int timeout = 5) const;
 
   /**
    * @see SocketCore::readData()

src/SocketCore.cc

@@ -130,7 +130,7 @@ void SocketCore::getPeerInfo(pair<string, int>& peerinfo) const {
   peerinfo.second = ntohs(peerin.sin_port);
 }
 
-void SocketCore::establishConnection(string host, int port) {
+void SocketCore::establishConnection(const string& host, int port) {
   closeConnection();
   sockfd = socket(AF_INET, SOCK_STREAM, 0);
   if(sockfd == -1) {

src/SocketCore.h

@@ -102,7 +102,7 @@ public:
    * @param host hostname or ip address to connect to
    * @param port service port number to connect to
    */
-  void establishConnection(string host, int port);
+  void establishConnection(const string& host, int port);
 
   /**
    * Makes this socket blocking mode.

src/TorrentMan.cc

@@ -350,7 +350,7 @@ void TorrentMan::readFileEntry(FileEntries& fileEntries, Directory** pTopDir, co
   }
 }
 
-void TorrentMan::setup(string metaInfoFile, const Strings& targetFilePaths) {
+void TorrentMan::setup(const string& metaInfoFile, const Strings& targetFilePaths) {
   peerId = "-A2****-";
   for(int i = 0; i < 12; i++) {
     peerId += Util::itos((int)(((double)10)*random()/(RAND_MAX+1.0)));
@@ -466,7 +466,7 @@ bool TorrentMan::segmentFileExists() const {
   }
 }
 
-FILE* TorrentMan::openSegFile(string segFilename, string mode) const {
+FILE* TorrentMan::openSegFile(const string& segFilename, const string& mode) const {
   FILE* segFile = fopen(segFilename.c_str(), mode.c_str());
   if(segFile == NULL) {
     throw new DlAbortEx(strerror(errno));

src/TorrentMan.h

@@ -76,7 +76,7 @@ private:
   bool setupComplete;
   const Logger* logger;
 
-  FILE* openSegFile(string segFilename, string mode) const;
+  FILE* openSegFile(const string& segFilename, const string& mode) const;
   void read(FILE* file);
 
   Piece findUsedPiece(int index) const;
@@ -141,7 +141,7 @@ public:
     return infoHash;
   }
 
-  void setup(string metaInfoFile, const Strings& targetFilePaths);
+  void setup(const string& metaInfoFile, const Strings& targetFilePaths);
 
   string getPieceHash(int index) const;
 
@@ -201,7 +201,7 @@ public:
   }
 
   string getStoreDir() const { return storeDir; }
-  void setStoreDir(string dir) { storeDir = dir; }
+  void setStoreDir(const string& dir) { storeDir = dir; }
 
   string getSegmentFilePath() const;