#ifndef DOS_FILEHANDLER_H
#define DOS_FILEHANDLER_H
/*
**      $VER: filehandler.h 44.1 (24.8.1999)
**      Includes Release 44.1
**
**      device and file handler specific code for AmigaDOS
**
**      (C) Copyright 1986-1999 Amiga, Inc.
**          All Rights Reserved
*/

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


/* The disk "environment" is a longword array that describes the
 * disk geometry.  It is variable sized, with the length at the beginning.
 * Here are the constants for a standard geometry.
 */

struct DosEnvec {
    ULONG de_TableSize;      /* Size of Environment vector */
    ULONG de_SizeBlock;      /* in longwords: Physical disk block size */
    ULONG de_SecOrg;         /* not used; must be 0 */
    ULONG de_Surfaces;       /* # of heads (surfaces). drive specific */
    ULONG de_SectorPerBlock; /* N de_SizeBlock sectors per logical block */
    ULONG de_BlocksPerTrack; /* blocks per track. drive specific */
    ULONG de_Reserved;       /* DOS reserved blocks at start of partition. */
    ULONG de_PreAlloc;       /* DOS reserved blocks at end of partition */
    ULONG de_Interleave;     /* usually 0 */
    ULONG de_LowCyl;         /* starting cylinder. typically 0 */
    ULONG de_HighCyl;        /* max cylinder. drive specific */
    ULONG de_NumBuffers;     /* Initial # DOS of buffers.  */
    ULONG de_BufMemType;     /* type of mem to allocate for buffers */
    ULONG de_MaxTransfer;    /* Max number of bytes to transfer at a time */
    ULONG de_Mask;           /* Address Mask to block out certain memory */
    LONG  de_BootPri;        /* Boot priority for autoboot */
    ULONG de_DosType;        /* ASCII (HEX) string showing filesystem type;
                              * 0X444F5300 is old filesystem,
                              * 0X444F5301 is fast file system */
    ULONG de_Baud;           /* Baud rate for serial handler */
    ULONG de_Control;        /* Control word for handler/filesystem */
    ULONG de_BootBlocks;     /* Number of blocks containing boot code */

};

/* these are the offsets into the array */
/* DE_TABLESIZE is set to the number of longwords in the table minus 1 */

#define DE_TABLESIZE    0       /* minimum value is 11 (includes NumBuffers) */
#define DE_SIZEBLOCK    1       /* in longwords: standard value is 128 */
#define DE_SECORG       2       /* not used; must be 0 */
#define DE_NUMHEADS     3       /* # of heads (surfaces). drive specific */
#define DE_SECSPERBLK   4       /* not used; must be 1 */
#define DE_BLKSPERTRACK 5       /* blocks per track. drive specific */
#define DE_RESERVEDBLKS 6       /* unavailable blocks at start.  usually 2 */
#define DE_PREFAC       7       /* not used; must be 0 */
#define DE_INTERLEAVE   8       /* usually 0 */
#define DE_LOWCYL       9       /* starting cylinder. typically 0 */
#define DE_UPPERCYL     10      /* max cylinder.  drive specific */
#define DE_NUMBUFFERS   11      /* starting # of buffers.  typically 5 */
#define DE_MEMBUFTYPE   12      /* type of mem to allocate for buffers. */
#define DE_BUFMEMTYPE   12      /* same as above, better name
                                 * 1 is public, 3 is chip, 5 is fast */
#define DE_MAXTRANSFER  13      /* Max number bytes to transfer at a time */
#define DE_MASK         14      /* Address Mask to block out certain memory */
#define DE_BOOTPRI      15      /* Boot priority for autoboot */
#define DE_DOSTYPE      16      /* ASCII (HEX) string showing filesystem type;
                                 * 0X444F5300 is old filesystem,
                                 * 0X444F5301 is fast file system */
#define DE_BAUD         17      /* Baud rate for serial handler */
#define DE_CONTROL      18      /* Control word for handler/filesystem */
#define DE_BOOTBLOCKS   19      /* Number of blocks containing boot code */

/* The file system startup message is linked into a device node's startup
** field.  It contains a pointer to the above environment, plus the
** information needed to do an exec OpenDevice().
*/
struct FileSysStartupMsg {
    ULONG       fssm_Unit;      /* exec unit number for this device */
    BSTR        fssm_Device;    /* null terminated bstring to the device name */
    BPTR        fssm_Environ;   /* ptr to environment table (see above) */
    ULONG       fssm_Flags;     /* flags for OpenDevice() */
};


/* The include file "libraries/dosextens.h" has a DeviceList structure.
 * The "device list" can have one of three different things linked onto
 * it.  Dosextens defines the structure for a volume.  DLT_DIRECTORY
 * is for an assigned directory.  The following structure is for
 * a dos "device" (DLT_DEVICE).
*/

struct DeviceNode {
    BPTR        dn_Next;        /* singly linked list */
    ULONG       dn_Type;        /* always 0 for dos "devices" */
    struct MsgPort *dn_Task;    /* standard dos "task" field.  If this is
                                 * null when the node is accesses, a task
                                 * will be started up */
    BPTR        dn_Lock;        /* not used for devices -- leave null */
    BSTR        dn_Handler;     /* filename to loadseg (if seglist is null) */
    ULONG       dn_StackSize;   /* stacksize to use when starting task */
    LONG        dn_Priority;    /* task priority when starting task */
    BPTR        dn_Startup;     /* startup msg: FileSysStartupMsg for disks */
    BPTR        dn_SegList;     /* code to run to start new task (if necessary).
                                 * if null then dn_Handler will be loaded. */
    BPTR        dn_GlobalVec;   /* BCPL global vector to use when starting
                                 * a task.  -1 means that dn_SegList is not
                                 * for a bcpl program, so the dos won't
                                 * try and construct one.  0 tell the
                                 * dos that you obey BCPL linkage rules,
                                 * and that it should construct a global
                                 * vector for you.
                                 */
    BSTR        dn_Name;        /* the node name, e.g. '\3','D','F','3' */
};

#endif  /* DOS_FILEHANDLER_H */