#ifndef __SQUISH_H__
#define __SQUISH_H__

/*
**  File extensions
*/
#define EXT_SQDFILE     ".sqd"
#define EXT_SQIFILE     ".sqi"
#define EXT_SQLFILE     ".sql"

typedef long FOFS;

#define NULL_FRAME    ((FOFS)0L)
#define FRAME_normal  0x00
#define FRAME_free    0x01
#define FRAME_rle     0x02    /* not implemented */
#define FRAME_lzw     0x03    /* not implemented */

#define EVERYTHING    0xffffu

#define SFB_LEN       2048
#define IFB_LEN       1024

#define EXTRA_BUF     16


typedef struct _sqbase
{
    word len;              /* LENGTH OF THIS STRUCTURE! */             /* 0 */
    word rsvd1;            /* reserved */                              /* 2 */

    dword num_msg;         /* Number of messages in area */            /* 4 */
    dword high_msg;        /* Highest msg in area. Same as num_msg */  /* 8 */
    dword skip_msg;        /* Skip killing first x msgs in area */    /* 12 */
    dword high_water;      /* Msg# (not umsgid) of HWM */             /* 16 */

    dword uid;             /* Number of the next UMSGID to use */     /* 20 */

    byte base[80];         /* Base name of SquishFile */              /* 24 */

    FOFS begin_frame;      /* Offset of first frame in file */       /* 104 */
    FOFS last_frame;       /* Offset to last frame in file */        /* 108 */
    FOFS free_frame;       /* Offset of first FREE frame in file */  /* 112 */
    FOFS last_free_frame;  /* Offset of last free frame in file */   /* 116 */
    FOFS end_frame;        /* Pointer to end of file */              /* 120 */

    dword max_msg;         /* Max # of msgs to keep in area */       /* 124 */
    word keep_days;        /* Max age of msgs in area (SQPack) */    /* 128 */
    word sz_sqhdr;         /* sizeof(SQHDR) */                       /* 130 */
    byte rsvd2[124];       /* Reserved by Squish for future use */   /* 132 */

                                                              /* total: 256 */
} SQBASE, *SQBASEptr;

#define SQBASE_SIZE 256

#define SQHDRID       0xAFAE4453UL

typedef struct
{
    dword id;         /* id must always equal SQHDRID */

    FOFS next_frame;
    FOFS prev_frame;

    dword frame_length;
    dword msg_length;
    dword clen;

    word frame_type;
    word rsvd;
} SQHDR, *SQHDRptr;

#define SQHDR_SIZE 28


typedef struct
{
    FOFS ofs;
    UMSGID umsgid;
    dword hash;
} SQIDX, *SQIDXptr;

#define SQIDX_SIZE 12

int read_xmsg(int handle, XMSG *pxmsg);
int write_xmsg(int handle, XMSG *pxmsg);
int read_sqhdr(int, SQHDR *);
int write_sqhdr(int, SQHDR *);
int read_sqidx(int, SQIDX *, dword);
int write_sqidx(int, SQIDX *, dword);
int read_sqbase(int handle, struct _sqbase *psqbase);
int write_sqbase(int handle, struct _sqbase *psqbase);

#endif