Adds a Downloader component to JGE able to download and cache files.

JGE/include/Downloader.h

@@ -0,0 +1,128 @@
+#ifndef DOWNLOADER_H
+#define DOWNLOADER_H
+
+//-------------------------------------------------------------------------------------
+//
+// This class handles download of remote resources (any kind of file)
+// All the resources are stored locally in the userPath
+// For every resources, the downloader verifies if the resource was modifed
+// on the server before downloading the update. The Downloader maintains a catalogue
+// of resource downloaded to be able to check if they need to be updated.
+//
+// The interface can be used completly synchronously by the application and some
+// context or message loop is needed in the implementation of this interface
+//
+// Note that the Downloader could in theory by implemented on top of JNetwork.
+//
+//-------------------------------------------------------------------------------------
+#include <string>
+#include <ostream>
+#include <istream>
+#include <fstream>
+#include <map>
+#include "Threading.h"
+#ifdef QT_CONFIG
+#include <QObject>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QNetworkAccessManager>
+#endif
+
+using namespace std;
+
+class DownloadRequest
+        #ifdef QT_CONFIG
+        : public QObject
+        #endif
+{
+#ifdef QT_CONFIG
+    Q_OBJECT
+
+private slots:
+#endif
+    void fileDownloaded();
+    void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
+
+#ifdef QT_CONFIG
+signals:
+    void percentChanged(int percent);
+    void statusChanged(int);
+#endif
+
+public:
+    typedef enum {
+        NOT_PRESENT,
+        DOWNLOADING,
+        DOWNLOADED,
+        DOWNLOAD_ERROR
+    } DownloadStatus;
+
+protected:
+    string mLocalPath;
+    string mRemoteResourceURL;
+    // previous one is the original, next one can change after redirection
+    string mRequestedRemoteResourceURL;
+    string mETag;
+    DownloadStatus mDownloadStatus;
+    bool mUpgradeAvailable;
+    uint64_t mTotalSize;
+    uint64_t mCurrentSize;
+    ofstream mFile;
+#ifdef QT_CONFIG
+    QNetworkReply* mNetworkReply;
+    static QNetworkAccessManager networkAccessManager;
+#endif
+
+
+public:
+    DownloadRequest(string localPath="",
+                    string remoteResourceURL="",
+                    string ETag = "",
+                    DownloadStatus downloadStatus=NOT_PRESENT,
+                    uint64_t totalSize = 0,
+                    uint64_t currentSize = 0);
+    ~DownloadRequest();
+    static bool NetworkIsAccessible();
+
+    string getTempLocalPath() const { return (mLocalPath+".tmp"); };
+    string getLocalPath() const { return mLocalPath; };
+    string getRemoteResource() const { return mRemoteResourceURL; };
+    string getETag() const { return mETag; };
+    void startGet();
+    void startHead();
+    DownloadStatus getDownloadStatus() const { return mDownloadStatus; };
+    bool upgradeAvailable() const { return mUpgradeAvailable; };
+    void getSizes(uint64_t& totalSize, uint64_t&currentSize) {
+        totalSize = mTotalSize;
+        currentSize = mCurrentSize;
+    };
+
+    friend ostream& operator<<(ostream& out, const DownloadRequest& d);
+    friend istream& operator>>(istream&, DownloadRequest&);
+    friend class Downloader;
+};
+
+
+class Downloader
+{
+protected:
+    Downloader(string globalRemoteURL="", string localCacheRecords="");
+    virtual ~Downloader();
+    static Downloader* mInstance;
+    string mGlobalRemoteURL;
+    string mLocalCacheRecords;
+    boost::mutex mMutex;
+    map<string, DownloadRequest*> mRequestMap;
+
+public:
+    static Downloader* GetInstance();
+    static void Release();
+
+    void Update();
+    DownloadRequest* Get(string localPath, string remoteResourceURL="");
+
+    friend ostream& operator<<(ostream& out, const Downloader& d);
+    friend istream& operator>>(istream&, Downloader&);
+};
+
+#endif // DOWNLOADER_H

JGE/include/JFileSystem.h

@@ -128,6 +128,7 @@ public:
     bool readIntoString(const string & FilePath, string & target);
     bool openForWrite(ofstream & File, const string & FilePath, ios_base::openmode mode = ios_base::out );
     bool Rename(string from, string to);
+    bool Remove(string aFile);
 
     //Returns true if strFilename exists somewhere in the fileSystem
     bool FileExists(const string& strFilename);
@@ -163,4 +164,4 @@ protected:
 
 
 
-#endif
+#endif