BufferIO.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 _SUPPORT2_BUFFERIO_H
#define _SUPPORT2_BUFFERIO_H

#include <support/ByteStream.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace support {
#endif

/*  @addtogroup CoreSupportDataModel
    @{
*/


class BBufferIO : public BnByteInput, public BnByteOutput, public BnByteSeekable
{
    enum {
        DEFAULT_BUF_SIZE = 65536L
    };

    public:
                                BBufferIO(
                                    const sptr<IByteInput>& inStream,
                                    const sptr<IByteOutput>& outStream,
                                    const sptr<IByteSeekable>& seeker,
                                    size_t buf_size = DEFAULT_BUF_SIZE
                                );
        virtual                 ~BBufferIO();
        
        virtual ssize_t         ReadV(const struct iovec *vector, ssize_t count, uint32_t flags = 0);
        virtual ssize_t         WriteV(const struct iovec *vector, ssize_t count, uint32_t flags = 0);
        virtual status_t        Sync();
        
        virtual off_t           Seek(off_t position, uint32_t seek_mode);
        virtual off_t           Position() const;

                // XXX remove in favor of Sync()??
                status_t        Flush();

    protected:

                                BBufferIO(size_t buf_size = DEFAULT_BUF_SIZE);

    private:

                IByteInput *    m_in;
                IByteOutput *   m_out;
                IByteSeekable * m_seeker;
                off_t           m_buffer_start;
                char *          m_buffer;
                size_t          m_buffer_phys;
                size_t          m_buffer_used;
                off_t           m_seek_pos;         // _reserved_ints[0-1]
                off_t           m_len;              // _reserved_ints[2-3]
                bool            m_buffer_dirty : 1;
                bool            m_owns_stream : 1;
};

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

#endif /* _SUPPORT2_BUFFERIO_H */

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