CURL_File.h

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#ifndef joedb_CURL_File_declared
#define joedb_CURL_File_declared
 
#include "joedb/journal/Buffered_File.h"
 
#define CURL_NO_OLDIES
#include <curl/curl.h>
 
namespace joedb
{
 class CURL_Easy
 {
  protected:
   CURL * const curl;
 
  public:
   CURL_Easy();
   CURL_Easy(const CURL_Easy &) = delete;
   CURL_Easy &operator=(const CURL_Easy &) = delete;
   ~CURL_Easy();
 };
 
 /// @ingroup journal
 class CURL_File: public CURL_Easy, public Buffered_File
 {
  private:
   static void error_check(CURLcode code);
 
   struct pread_Callback_Data
   {
    char * const buffer;
    const size_t size;
    size_t offset;
 
    size_t copy(char *contents, size_t real_size);
   };
 
   static size_t pread_callback
   (
    void *contents,
    size_t size,
    size_t nmemb,
    void *p
   );
 
   static size_t copy_callback
   (
    void *contents,
    size_t size,
    size_t nmemb,
    void *p
   );
 
   void perform_range(int64_t start, int64_t size) const;
 
   size_t pread(char *buffer, size_t size, int64_t offset) const override;
   void copy_to(Buffered_File &destination, int64_t start, int64_t size) override;
 
  public:
   CURL_File(const char *url, bool verbose);
 };
}
 
#endif