/*
 * Copyright 2008-2010, Axel Dörfler, axeld@pinc-software.de.
 * All rights reserved. Distributed under the terms of the MIT License.
 */

#ifndef DEVICEOPENER_H
#define DEVICEOPENER_H

#ifdef FS_SHELL
#       include "fssh_api_wrapper.h"
#else
#       include <fcntl.h>
#       include <sys/types.h>
#       include <SupportDefs.h>
#endif


class DeviceOpener {
        public:
                                                                DeviceOpener(int fd, int mode);
                                                                DeviceOpener(const char* device, int mode);
                                                                ~DeviceOpener();

                                int                             Open(const char* device, int mode);
                                int                             Open(int fd, int mode);
                                void*                   InitCache(off_t numBlocks, uint32 blockSize);
                                void                    RemoveCache(bool allowWrites);

                                void                    Keep();

                                int                             Device() const { return fDevice; }
                                int                             Mode() const { return fMode; }
                                bool                    IsReadOnly() const {
                                                                                                return _IsReadOnly(fMode); }

                                status_t                GetSize(off_t* _size,
                                                                                uint32* _blockSize = NULL);

        private:
                        static  bool            _IsReadOnly(int mode)
                                                                        { return (mode & O_RWMASK) == O_RDONLY; }
                        static  bool            _IsReadWrite(int mode)
                                                                        { return (mode & O_RWMASK) == O_RDWR; }

                                        int                     fDevice;
                                        int                     fMode;
                                        void*           fBlockCache;
};

#endif  // DEVICEOPENER_H