#ifndef INCLUDE_ASYNCIO_H
#define INCLUDE_ASYNCIO_H


/*****************************************************************************/

#ifndef EXEC_TYPES_H
#include <exec/types.h>
#endif

#ifndef EXEC_PORTS_H
#include <exec/ports.h>
#endif

#ifndef DOS_DOS_H
#include <dos/dos.h>
#endif

/*****************************************************************************/


/* This structure is public only by necessity, don't muck with it yourself, or
 * you're looking for trouble
 */
struct AsyncFile
  {
    BPTR af_File;
    ULONG af_BlockSize;
    struct MsgPort *af_Handler;
    APTR af_Offset;
    LONG af_BytesLeft;
    ULONG af_BufferSize;
    APTR af_Buffers[2];
    struct StandardPacket af_Packet;
    struct MsgPort af_PacketPort;
    ULONG af_CurrentBuf;
    ULONG af_SeekOffset;
    UBYTE af_PacketPending;
    UBYTE af_ReadMode;
  };


/*****************************************************************************/


#define MODE_READ   0		/* read an existing file                             */
#define MODE_WRITE  1		/* create a new file, delete existing file if needed */
#define MODE_APPEND 2		/* append to end of existing file, or create new     */

#define MODE_START   -1		/* relative to start of file         */
#define MODE_CURRENT  0		/* relative to current file position */
#define MODE_END      1		/* relative to end of file         */


/*****************************************************************************/

struct AsyncFile *OpenAsync (const STRPTR fileName, UBYTE accessMode, LONG bufferSize);
LONG CloseAsync (struct AsyncFile *file);
LONG ReadAsync (struct AsyncFile *file, APTR buffer, LONG numBytes);
LONG ReadCharAsync (struct AsyncFile *file);
LONG WriteAsync (struct AsyncFile *file, APTR buffer, LONG numBytes);
LONG WriteCharAsync (struct AsyncFile *file, UBYTE ch);
LONG SeekAsync (struct AsyncFile *file, LONG position, BYTE mode);


/*****************************************************************************/


#endif /* INCLUDE_ASYNCIO_H */