VFSFile.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _STORAGE_VFS_FILE_H
#define _STORAGE_VFS_FILE_H

#include <support/IStorage.h>
#include <support/URL.h>

#include <VFSMgr.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace storage {
using namespace palmos::support;
#endif

class BVFSFile : public BnStorage
{
    public:
        enum flags
        {
            DELETE_IF_EMPTY     = 1
        };
        
        
                            BVFSFile();
                            BVFSFile(const char* path, int flags, int mode=0, status_t * outResult=0);
                            BVFSFile(const SUrl & url, int flags, int mode=0, status_t * outResult=0);
                
                status_t    InitCheck() const;
                
                // Set the object to access the given file.  Opens the file.
                status_t    SetTo(const char* path, int flags, int mode=0);
                status_t    SetTo(const SUrl & url, int flags, int mode=0);

                bool        IsReadable() const;
                bool        IsWritable() const;
    
                uint16_t    VolRefNum() const;  

                status_t    Delete();
        
        virtual off_t       Size() const;           // query for total file size
        virtual status_t    SetSize(off_t size);    // resize file
        
        virtual ssize_t     ReadAtV(off_t position, const struct iovec *vector, ssize_t count);
        virtual ssize_t     WriteAtV(off_t position, const struct iovec *vector, ssize_t count);
        
        virtual status_t    Sync();

    protected:
        virtual             ~BVFSFile();
        
private:
    status_t        m_initStatus;
    int             m_fd;
    int             m_flags;
    off_t           m_pos;
};



#if _SUPPORTS_NAMESPACE
} } // namespace palmos::storage
#endif

#endif /* _STORAGE_VFS_FILE_H */

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