/*
 * Copyright 2001-2011, Haiku Inc. All rights reserved.
 * This file may be used under the terms of the MIT License.
 *
 * Authors:
 *              Jérôme Duval
 */
#ifndef EXTENTSTREAM_H
#define EXTENTSTREAM_H


#include "ext2.h"
#include "Transaction.h"


class Inode;
class Volume;


class ExtentStream
{
public:
                                        ExtentStream(Volume* volume, Inode* inode,
                                                ext2_extent_stream* stream, off_t size);
                                        ~ExtentStream();

        status_t                FindBlock(off_t offset, fsblock_t& block,
                                                uint32 *_count = NULL);
        status_t                Enlarge(Transaction& transaction, off_t& numBlocks);
        status_t                Shrink(Transaction& transaction, off_t& numBlocks);
        void                    Init();
        
        bool                    Check();

private:
        status_t                _Check(ext2_extent_stream *stream, fileblock_t &block);
        status_t                _CheckBlock(ext2_extent_stream *stream, fsblock_t block);

        Volume*                 fVolume;
        Inode*                  fInode;
        ext2_extent_stream* fStream;
        fsblock_t               fFirstBlock;

        fsblock_t               fAllocatedPos;

        off_t                   fNumBlocks;
        off_t                   fSize;
};

#endif  // EXTENTSTREAM_H