/**
 * ms-biff.h: MS Excel BIFF support for Gnumeric
 *
 * Author:
 *    Michael Meeks (michael@imaginator.com)
 **/
#ifndef GNUMERIC_BIFF_H
#define GNUMERIC_BIFF_H
#include "ms-ole.h"

typedef guint8  BYTE ;
typedef guint16 WORD ;
typedef guint32 LONG ;
typedef guint64 DLONG ;

/* EXTREMELY IMPORTANT TO PASS A BYTE PTR ! */
#define BIFF_GETBYTE(p) (*(p+0))
#define BIFF_GETWORD(p) (*(p+0)+(*(p+1)<<8))
#define BIFF_GETLONG(p) (*(p+0)+ \
		        (*(p+1)<<8)+ \
		        (*(p+2)<<16)+ \
		        (*(p+3)<<24))
#define BIFF_GETDLONG(p) (DLONG)(BIFF_GETLONG(p)+(((DLONG)BIFF_GETLONG(p+4))<<32))

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
        #define BIFF_GETDOUBLE(p) (*((double*)(p)))
#else
static double biff_getdouble(guint8 *p)
{
    double d;
    int i;
    guint8 *t = (guint8 *)&d + 8;

    for (i = 0; i < 8; i++)
        *--t = *p++;
    return d;
}
        #define BIFF_GETDOUBLE(p) (biff_getdouble(p))
#endif
/**
 * Returns query data, it is imperative that copies of
 * 'data *' should _not_ be kept.
 **/
typedef struct _BIFF_QUERY
{
  guint8  ms_op ;
  guint8  ls_op ;
  guint16 opcode ;
  gint32  length ;        /* NB. can be extended by a continue opcode */
  guint8  *data ;
  int     data_malloced ; /* is *data a copy ? */
  guint32 streamPos ;     /* count of bytes into the stream */
  MS_OLE_STREAM *pos ;
} BIFF_QUERY ;
 
/* Sets up a query on a stream */
extern BIFF_QUERY *ms_biff_query_new (MS_OLE_STREAM *) ;
/* Duplicates this query, so chaining can re-commence here */
extern BIFF_QUERY *ms_biff_query_copy (const BIFF_QUERY *p) ;
/**
 * Updates the BIFF_QUERY structure with the next BIFF record
 * returns: 1 for succes, and 0 for EOS(tream)
 **/
extern int ms_biff_query_next (BIFF_QUERY *) ;
extern void ms_biff_query_destroy (BIFF_QUERY *) ;
#endif