// SuperBlock.h
//
// Copyright (c) 2003, Ingo Weinhold (bonefish@cs.tu-berlin.de)
//
// 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
// (at your option) 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// You can alternatively use *this file* under the terms of the the MIT
// license included in this package.

#ifndef SUPER_BLOCK_H
#define SUPER_BLOCK_H

#include "endianess.h"
#include "reiserfs.h"

class SuperBlock {
public:
        SuperBlock();
        ~SuperBlock();

        status_t Init(int device, off_t offset = 0);

        uint32 GetFormatVersion() const { return fFormatVersion; }

        uint16 GetBlockSize() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_blocksize) : le2h(fOldData->s_blocksize));
        }

        uint32 CountBlocks() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_block_count)
                        : le2h(fOldData->s_block_count));
        }

        uint32 CountFreeBlocks() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_free_blocks)
                        : le2h(fOldData->s_free_blocks));
        }

        uint16 GetVersion() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_version) : REISERFS_VERSION_0);
        }

        uint32 GetRootBlock() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_root_block) : le2h(fOldData->s_root_block));
        }

        uint16 GetState() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_state) : le2h(fOldData->s_state));
        }

        uint32 GetHashFunctionCode() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_hash_function_code) : UNSET_HASH);
        }

        uint16 GetTreeHeight() const
        {
                return (GetFormatVersion() == REISERFS_3_6
                        ? le2h(fCurrentData->s_tree_height)
                        : le2h(fOldData->s_tree_height));
        }

        status_t GetLabel(char* buffer, size_t bufferSize) const;

private:
        uint32  fFormatVersion;
        union {
                reiserfs_super_block    *fCurrentData;
                reiserfs_super_block_v1 *fOldData;
        };
};

#endif  // SUPER_BLOCK_H