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FrameMgr.h

/******************************************************************
Copyright 1993, 1994 by Digital Equipment Corporation, Maynard, Massachusetts,

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

  Author: Hiroyuki Miyamoto  Digital Equipment Corporation
                             miyamoto@jrd.dec.com

    This version tidied and debugged by Steve Underwood May 1999

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

#ifndef FRAMEMGR_H
#define FRAMEMGR_H

#include <X11/Xmd.h>
#include <X11/Xlib.h>
#include <stdio.h>

#if defined(VAXC) && !defined(__DECC)
#define xim_externalref globalref
#define xim_externaldef globaldef
#else
#define xim_externalref extern
#define xim_externaldef
#endif

/* Definitions for FrameMgr */

#define COUNTER_MASK 0x10

typedef enum
{
    BIT8     = 0x1,       /* {CARD8* | INT8*}   */
    BIT16    = 0x2,       /* {CARD16* | INT16*} */
    BIT32    = 0x3,       /* {CARD32* | INT32*} */
    BIT64    = 0x4,       /* {CARD64* | INT64*} */
    BARRAY   = 0x5,       /* int*, void*        */
    ITER     = 0x6,       /* int*               */
    POINTER  = 0x7,       /* specifies next item is a PTR_ITEM */
    PTR_ITEM = 0x8,       /* specifies the item has a pointer */
    /* BOGUS - POINTER and PTR_ITEM
     *   In the current implementation, PTR_ITEM should be lead by
     *   POINTER.  But actually, it's just redundant logically.  Someone 
     *   may remove this redundancy and POINTER from the enum member but he
     *   should also modify the logic in FrameMgr program.
     */
    PADDING  = 0x9,       /* specifies that a padding is needed.
                       * This requires extra data in data field.
                       */
    EOL      = 0xA,       /* specifies the end of list */

    COUNTER_BIT8  = COUNTER_MASK | 0x1,
    COUNTER_BIT16 = COUNTER_MASK | 0x2,
    COUNTER_BIT32 = COUNTER_MASK | 0x3,
    COUNTER_BIT64 = COUNTER_MASK | 0x4
} XimFrameType;

/* Convenient macro */
#define _FRAME(a) {a, NULL}
#define _PTR(p)   {PTR_ITEM, (void *)p}
/* PADDING's usage of data field
 * B15-B8  : Shows the number of effective items.
 * B7-B0   : Shows padding unit.  ex) 04 shows 4 unit padding.
 */
#define _PAD2(n)   {PADDING, (void*)((n)<<8|2)}
#define _PAD4(n)   {PADDING, (void*)((n)<<8|4)}

#define FmCounterByte 0
#define FmCounterNumber 1
    
#define _BYTE_COUNTER(type, offset) \
               {(COUNTER_MASK|type), (void*)((offset)<<8|FmCounterByte)}

#define _NUMBER_COUNTER(type, offset) \
               {(COUNTER_MASK|type), (void*)((offset)<<8|FmCounterNumber)}

typedef struct _XimFrame
{
    XimFrameType type;
    void* data;       /* For PTR_ITEM and PADDING */
} XimFrameRec, *XimFrame;

typedef enum
{
    FmSuccess, 
    FmEOD,
    FmInvalidCall,
    FmBufExist,
    FmCannotCalc,
    FmNoMoreData
} FmStatus;

typedef struct _FrameMgr *FrameMgr;

FrameMgr FrameMgrInit(XimFrame frame, char* area, Bool byte_swap);
void FrameMgrInitWithData(FrameMgr fm, XimFrame frame, void* area,
                    Bool byte_swap);
void FrameMgrFree(FrameMgr fm);
FmStatus FrameMgrSetBuffer(FrameMgr, void*);
FmStatus _FrameMgrPutToken(FrameMgr, void*, int);
FmStatus _FrameMgrGetToken(FrameMgr, void*, int);
FmStatus FrameMgrSetSize(FrameMgr, int);
FmStatus FrameMgrSetIterCount(FrameMgr, int);
FmStatus FrameMgrSetTotalSize(FrameMgr, int);
int FrameMgrGetTotalSize(FrameMgr);
int FrameMgrGetSize(FrameMgr);
FmStatus FrameMgrSkipToken(FrameMgr, int);
void FrameMgrReset(FrameMgr);
Bool FrameMgrIsIterLoopEnd(FrameMgr, FmStatus*);

#define FrameMgrPutToken(fm, obj) _FrameMgrPutToken((fm), &(obj), sizeof(obj))
#define FrameMgrGetToken(fm, obj) _FrameMgrGetToken((fm), &(obj), sizeof(obj))

#endif /* FRAMEMGR_H */

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