/*
 * Copyright 2003-2008, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 * 
 * Authors :
 *              Michael Wilber
 *              Jérôme Duval
 */

#ifndef STREAM_BUFFER_H
#define STREAM_BUFFER_H

#include <DataIO.h>

#define MIN_BUFFER_SIZE 512

class StreamBuffer {
public:
        StreamBuffer(BPositionIO *stream, size_t bufferSize, bool toRead = true);
        ~StreamBuffer();
        
        status_t InitCheck();
                // Determines whether the constructor failed or not
        
        ssize_t Read(void *buffer, size_t size);
                // copy nbytes from the stream into pinto
                
        void Write(void *buffer, size_t size);
                // copy nbytes from the stream into pinto
        
        off_t Seek(off_t position, uint32 seekMode);
                // seek the stream to the given position
        
        off_t Position();
                // return the actual position
private:
        ssize_t _ReadStream();
                // Load the stream buffer from the stream

        BPositionIO *fStream;
                // stream object this object is buffering
        uint8 *fBuffer;
                // buffered data from fpStream
        size_t fBufferSize;
                // number of bytes of memory allocated for fpBuffer
        size_t fLen;
                // number of bytes of actual data in fpBuffer
        size_t fPos;
                // current position in the buffer
        bool fToRead;
                // whether the stream is to be read.
};

#endif