/*******************************************************************/
/* BUFFER.H                                                        */
/* Include file for BUFFER.C                                       */
/*  Developers Toolkit 1995.                                       */
/*                                                                 */
/* (c)Copyright Sealevel Systems Incorporated, 1993 - 1995         */
/*                                                                 */
/*******************************************************************/

// #define _BORLAND		      /* Borland compiler option */

/*******************************************************************/
/* Return values                                                   */
/*******************************************************************/
#define    BM_DEVICE_STOPPED  0x01  /*Signal to restart the device */
#define    BM_STOP_IO         0x02  /*Signal to stop the device    */
#define    BM_DEVICE_OK       0x00  /*Signal to restart the device */
/*******************************************************************/
/* Defines for DEVICE_INFO                                         */
/*******************************************************************/
#define     DEVICE_IS_RUNNING 0x00     /* Used with bDeviceFlag    */
#define     DEVICE_IS_STOPPED 0x01     /* Used with bDeviceFlag    */
#define     INPUT_DEVICE      0x01     /* Used with bDeviceType    */
#define     OUTPUT_DEVICE     0x00     /* Used with bDeviceType    */
/*******************************************************************/
/* Defines for BUFFER_INFO                                         */
/*******************************************************************/

/*******************************************************************/
/*  Note:   All np??? variables hold near pointer to BUFFER_INFO   */
/*          type structs                                           */
/*******************************************************************/
#pragma pack(1)                          /* Align on Byte boundary */
typedef struct BUFFER_INFO * npBUFFER_INFO;
#ifdef _BORLAND
	typedef struct DEVICE_INFO far * fpDEVICE_INFO;
#else
	typedef struct DEVICE_INFO __far * fpDEVICE_INFO;
#endif
struct DEVICE_INFO
{
    npBUFFER_INFO npFirstBuffer; // First Buffer in the ring
    unsigned short wTimeOut;     // Time-Out Value
    unsigned short wTotal;       // Total Number of Buffers
    unsigned short wRedBuffers;  // Current Number of RED Buffers
    npBUFFER_INFO npCurrent;     // Near pointer to Current Buffer
    npBUFFER_INFO npNext_RED;    // Near pointer to Next RED Buffer
    npBUFFER_INFO npNext_GREEN;  // Near pointer to Next GREEN Buffer
    unsigned char bDeviceType;   // Input or Output etc.
    unsigned char bDeviceFlag;   // Busy bit
};

struct BUFFER_INFO
{
    #ifdef _BORLAND
	unsigned char far * fpBufferAddress;  // Far Address of Data Buffer
    #else
	unsigned char __far * fpBufferAddress;  // Far Address of Data Buffer
    #endif
    npBUFFER_INFO npNextBuffer;  // Near Address of Next Buffer in Ring
    unsigned short wByteCount;   // Buffer Count
    unsigned char bBufferFlag;   // Misc. Flag (Optional)
};

#pragma pack()                         /* Revert to default packing */

#ifdef _BORLAND
	void AddBuffer( fpDEVICE_INFO, npBUFFER_INFO, unsigned char far *);
	unsigned char far * AssignBuffer( fpDEVICE_INFO);
#else
	void AddBuffer( fpDEVICE_INFO, npBUFFER_INFO, unsigned char __far *);
	unsigned char __far * AssignBuffer( fpDEVICE_INFO);
#endif
unsigned short StartBuffer( fpDEVICE_INFO, unsigned char);
unsigned short ReleaseBuffer( fpDEVICE_INFO);
unsigned short SwapBuffer( fpDEVICE_INFO);
void EraseBuffers( fpDEVICE_INFO);
/*******************************************************************/
/*      End of File                                                */
/*******************************************************************/