download.h

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/*
 *  The ManaPlus Client
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2019  The ManaPlus Developers
 *  Copyright (C) 2019-2021  Andrei Karas
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef NET_DOWNLOAD_H
#define NET_DOWNLOAD_H
 
#include "enums/net/downloadstatus.h"
 
#include <curl/curl.h>
 
#include <string>
#include <queue>
 
#include "localconsts.h"
 
typedef int (*DownloadUpdate)(void *ptr,
                              const DownloadStatusT status,
                              size_t total,
                              const size_t remaining);
 
// Matches what CURL expects
typedef size_t (*WriteFunction)( void *ptr, size_t size, size_t nmemb,
                                 void *stream);
 
struct SDL_Thread;
 
namespace Net
{
class Download final
{
    public:
        Download(void *const ptr,
                 const std::string &url,
                 const DownloadUpdate updateFunction,
                 const bool ignoreError,
                 const bool isUpload,
                 const bool isXml);
 
        A_DELETE_COPY(Download)
 
        ~Download();
 
        void addHeader(const std::string &header);
 
        void noCache();
 
        void setFile(const std::string &filename,
                     const int64_t adler32);
 
        void setWriteFunction(WriteFunction write);
 
        bool start();
 
        void cancel();
 
        void addMirror(const std::string &str)
        { mUrlQueue.push(str); }
 
        const char *getError() const A_WARN_UNUSED;
 
        void setIgnoreError(const bool n)
        { mIgnoreError = n; }
 
        static size_t writeFunction(void *ptr, size_t size,
                                    size_t nmemb, void *stream);
 
        static void prepareForm(curl_httppost **form,
                                const std::string &fileName);
 
        static unsigned long fadler32(FILE *const file) A_WARN_UNUSED;
 
        static void addProxy(CURL *const curl);
 
        static void secureCurl(CURL *const curl);
 
        static void addHeaders(CURL *const curl);
 
        static void addCommonFlags(CURL *const curl);
 
        static unsigned long adlerBuffer(const char *const buffer, int size);
 
        static std::string getUploadResponse()
        { return mUploadResponse; }
 
    private:
        static int downloadThread(void *ptr);
        static int downloadProgress(void *clientp, double dltotal,
                                    double dlnow, double ultotal,
                                    double ulnow);
        static std::string mUploadResponse;
        void *mPtr;
        std::string mUrl;
        struct
        {
            unsigned cancel : 1;
            unsigned memoryWrite: 1;
            unsigned checkAdler: 1;
        } mOptions;
        std::string mFileName;
        std::queue<std::string> mUrlQueue;
        WriteFunction mWriteFunction;
        unsigned long mAdler;
        DownloadUpdate mUpdateFunction;
        SDL_Thread *mThread;
        CURL *mCurl;
        curl_slist *mHeaders;
        curl_httppost *mFormPost;
        char *mError;
        bool mIgnoreError;
        bool mUpload;
        bool mIsXml;
};
 
}  // namespace Net
 
#endif  // NET_DOWNLOAD_H