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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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
*/
/* copyright --> */
#ifndef _D_DISK_WRITER_H_
#define _D_DISK_WRITER_H_
#include <string>
#include "common.h"
using namespace std;
/**
* Interface for writing to a binary stream of bytes.
*
*/
class DiskWriter {
public:
virtual ~DiskWriter() {}
/**
* Creates a file output stream to write to the file with the specified name.
* If the file exists, then it is truncated to 0 length.
* @param filename the file name to be opened.
*/
virtual void initAndOpenFile(string filename) = 0;
/**
* Closes this output stream.
*/
virtual void closeFile() = 0;
/**
* Opens a file output stream to write to the file with the specified name.
* If the file doesnot exists, an exception may be throwed.
*
* @param filename the file name to be opened.
*/
virtual void openExistingFile(string filename) = 0;
/*
* Writes len bytes from data to this binary stream at offset position.
* In case where offset position is not concerned(just write data
* sequencially, for example), those subclasses can ignore the offset value.
*
* @param data the data
* @param len the number of bytes to write
* @param position the offset of this binary stream
*/
virtual void writeData(const char* data, int len, long long int position = 0) = 0;
virtual int readData(char* data, int len, long long int position) = 0;
virtual string sha1Sum(long long int offset, long long int length) = 0;
virtual void seek(long long int offset) = 0;
};
#endif // _D_DISK_WRITER_H_
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