基于QT5的FTP传输，支持断点续传

/**************************************************************************** ** ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtNetwork module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Digia. For licensing terms and ** conditions see http://qt.digia.com/licensing. 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These rights are described in the Digia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ //#define QFTPPI_DEBUG //#define QFTPDTP_DEBUG #include "qftp.h" #include "qabstractsocket.h" #ifndef QT_NO_FTP #include "qcoreapplication.h" #include "qtcpsocket.h" #include "qurlinfo.h" #include "qstringlist.h" #include "qregexp.h" #include "qtimer.h" #include "qfileinfo.h" #include "qhash.h" #include "qtcpserver.h" #include "qlocale.h" QT_BEGIN_NAMESPACE class QFtpPI; /* The QFtpDTP (DTP = Data Transfer Process) controls all client side data transfer between the client and server. */ class QFtpDTP : public QObject { Q_OBJECT public: enum ConnectState { CsHostFound, CsConnected, CsClosed, CsHostNotFound, CsConnectionRefused }; QFtpDTP(QFtpPI *p, QObject *parent = 0); void setData(QByteArray *); void setDevice(QIODevice *); void writeData(); void setBytesTotal(qint64 bytes); bool hasError() const; QString errorMessage() const; void clearError(); void connectToHost(const QString & host, quint16 port); int setupListener(const QHostAddress &address); void waitForConnection(); QTcpSocket::SocketState state() const; qint64 bytesAvailable() const; qint64 read(char *data, qint64 maxlen); QByteArray readAll(); void abortConnection(); static bool parseDir(const QByteArray &buffer, const QString &userName, QUrlInfo *info); signals: void listInfo(const QUrlInfo&); void readyRead(); void dataTransferProgress(qint64, qint64); void connectState(int); private slots: void socketConnected(); void socketReadyRead(); void socketError(QAbstractSocket::SocketError); void socketConnectionClosed(); void socketBytesWritten(qint64); void setupSocket(); void dataReadyRead(); private: void clearData(); QTcpSocket *socket; QTcpServer listener; QFtpPI *pi; QString err; qint64 bytesDone; qint64 bytesTotal; bool callWriteData; // If is_ba is true, ba is used; ba is never 0. // Otherwise dev is used; dev can be 0 or not. union { QByteArray *ba; QIODevice *dev; } data; bool is_ba; QByteArray bytesFromSocket; }; /********************************************************************** * * QFtpPI - Protocol Interpreter * *********************************************************************/ class QFtpPI : public QObject { Q_OBJECT public: QFtpPI(QObject *parent = 0); void connectToHost(const QString &host, quint16 port); bool sendCommands(const QStringList &cmds); bool sendCommand(const QString &cmd) { return sendCommands(QStringList(cmd)); } void clearPendingCommands(); void abort(); QString currentCommand() const { return currentCmd; } bool rawCommand; bool transferConnectionExtended; QFtpDTP dtp; // the PI has a DTP which is not the design of RFC 959, but it // makes the design simpler this way signals: void connectState(int); void finished(const QString&); void error(int, const QString&); void rawFtpReply(int, const QString&); private slots: void hostFound(); void connected(); void connectionClosed(); void delayedCloseFinished(); void readyRead(); void error(QAbstractSocket::SocketError); void dtpConnectState(int); private: // the states are modelled after the generalized state diagram of RFC 959, // page 58 enum State { Begin, Idle, Waiting, Success, Failure }; enum AbortState { None, AbortStarted, WaitForAbortToFinish }; bool processReply(); bool startNextCmd(); QTcpSocket commandSocket; QString replyText; char replyCode[3]; State state; AbortState abortState; QStringList pendingCommands; QString currentCmd; bool waitForDtpToConnect; bool waitForDtpToClose; QByteArray bytesFromSocket; friend class QFtpDTP; }; /********************************************************************** * * QFtpCommand implemenatation * *********************************************************************/ class QFtpCommand { public: QFtpCommand(QFtp::Command cmd, QStringList raw, const QByteArray &ba); QFtpCommand(QFtp::Command cmd, QStringList raw, QIODevice *dev = 0); ~QFtpCommand(); int id; QFtp::Command command; QStringList rawCmds; // If is_ba is true, ba is used; ba is never 0. // Otherwise dev is used; dev can be 0 or not. union { QByteArray *ba; QIODevice *dev; } data; bool is_ba; static QBasicAtomicInt idCounter; }; QBasicAtomicInt QFtpCommand::idCounter = Q_BASIC_ATOMIC_INITIALIZER(1); QFtpCommand::QFtpCommand(QFtp::Command cmd, QStringList raw, const QByteArray &ba) : command(cmd), rawCmds(raw), is_ba(true) { id = idCounter.fetchAndAddRelaxed(1); data.ba = new QByteArray(ba); } QFtpCommand::QFtpCommand(QFtp::Command cmd, QStringList raw, QIODevice *dev) : command(cmd), rawCmds(raw), is_ba(false) { id = idCounter.fetchAndAddRelaxed(1); data.dev = dev; } QFtpCommand::~QFtpCommand() { if (is_ba) delete data.ba; } /********************************************************************** * * QFtpDTP implemenatation * *********************************************************************/ QFtpDTP::QFtpDTP(QFtpPI *p, QObject *parent) : QObject(parent), socket(0), listener(this), pi(p), callWriteData(false) { clearData(); listener.setObjectName(QLatin1String("QFtpDTP active state server")); connect(&listener, SIGNAL(newConnection()), SLOT(setupSocket())); } void QFtpDTP::setData(QByteArray *ba)