filestreambuf.h

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#ifndef ZYPP_CORE_BASE_FILESTREAMBUF_H
#define ZYPP_CORE_BASE_FILESTREAMBUF_H
 
#include <zypp-core/AutoDispose.h>
#include <zypp-core/base/SimpleStreambuf>
 
namespace zypp {
  namespace detail {
    class FdStreamBufImpl {
      public:
        FdStreamBufImpl() {}
        ~FdStreamBufImpl() { closeImpl(); }

        void disableAutoClose();
 
        bool
        isOpen   () const
        { return (_fd >= 0); }
 
        bool
        canRead  () const
        { return( _mode == std::ios_base::in ); }
 
        bool
        canWrite () const
        { return( _mode == std::ios_base::out ); }
 
        bool canSeek  ( std::ios_base::seekdir way_r ) const {
          // we could implement seek for regular files, in that case openImpl should
          // check for the file type using fstat and S_ISREG
          return false;
        }
 
        std::streamsize readData ( char * buffer_r, std::streamsize maxcount_r  );
 
        bool writeData( const char * buffer_r, std::streamsize count_r );
 
        off_t seekTo( off_t off_r, std::ios_base::seekdir way_r, std::ios_base::openmode omode_r ) {
          return -1;
        }
 
        off_t tell() const {
          return -1;
        }
 
      protected:
        bool openImpl( int fd, std::ios_base::openmode mode_r );
        bool closeImpl ();  // closes the file
 
    private:
        zypp::AutoFD _fd = -1;
        std::ios_base::openmode  _mode = std::ios_base::openmode(0);
    };
  }
 
  using FdStreamBuf = detail::SimpleStreamBuf<detail::FdStreamBufImpl>;
}
#endif // ZYPP_CORE_BASE_FILESTREAMBUF_H