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/* $XConsortium: ar_conv.c,v 5.3 91/07/01 16:20:00 hersh Exp $ */

/***********************************************************
Copyright 1989, 1990, 1991 by Sun Microsystems, Inc. and the X Consortium.

                        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 Sun Microsystems,
the X Consortium, and MIT not be used in advertising or publicity 
pertaining to distribution of the software without specific, written 
prior permission.  

SUN MICROSYSTEMS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT 
SHALL SUN MICROSYSTEMS 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.

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

#include <stdio.h>
#include "phg.h"
#include "cp.h"
#include "ws.h"
#include "ar.h"
#include "PEXprotost.h"
#include "PEXproto.h"
#include "PEX.h"
#include "pexSwap.h"


/* For in place conversions which happen in this file */
#define CONVERT_CARD32(swp, val) \
    (val = ((swp)->ConvertCARD32 ? (*(swp)->ConvertCARD32)(&(val)) : (val)))

#define CONVERT_CARD16(swp, val) \
    (val = ((swp)->ConvertCARD16 ? (*(swp)->ConvertCARD16)(&(val)) : (val)))
    
    
static pexSwap   clientSwapStructure;	
static pexSwap  *swp = &clientSwapStructure;

static int fromFormat;
static int toFormat;

extern PEXFLOAT	ConvertIEEEToVax();
extern PEXFLOAT	SwapIEEEToVax();
extern PEXFLOAT	ConvertVaxToIEEE();
extern PEXFLOAT	SwapVaxToIEEE();
extern CARD16	SwapCARD16();
extern CARD32	SwapCARD32();

typedef struct {
	CARD16 (*s)();		/* Function to convert a short */
	CARD32 (*l)();		/* Function to convert a long */
	PEXFLOAT  (*f)();		/* Function to convert a float */
} ThreeFuncs;

static ThreeFuncs ConversionFunction[4][4] = {
	{   /* From Big Endian Ieee */
	    { 0, 0, 0 },
	    { SwapCARD16, SwapCARD32, (PEXFLOAT (*)())SwapCARD32 },
	    { 0, 0, ConvertIEEEToVax },
	    { SwapCARD16, SwapCARD32, SwapIEEEToVax }
	},
	{
	    /* From Big Endian DecF */
	    { SwapCARD16, SwapCARD32, (PEXFLOAT (*)())SwapCARD32 },
	    { 0, 0, 0 },
	    { SwapCARD16, SwapCARD32, SwapIEEEToVax },
	    { 0, 0, ConvertIEEEToVax }
	},
	{
	    /* From Little Endian Ieee */
	    { 0, 0, ConvertVaxToIEEE },
	    { SwapCARD16, SwapCARD32, SwapVaxToIEEE },
	    { 0, 0, 0 },
	    { SwapCARD16, SwapCARD32, (PEXFLOAT (*)())SwapCARD32 }
	},
	{
	    /* From Little Endian DecF */
	    { SwapCARD16, SwapCARD32, SwapVaxToIEEE },
	    { 0, 0, ConvertVaxToIEEE },
	    { SwapCARD16, SwapCARD32, (PEXFLOAT (*)())SwapCARD32 },
	    { 0, 0, 0 }
	}
};


void
phg_ar_set_conversion(from, to)
int from;
int to;
{
    toFormat		    = to;
    fromFormat		    = from;
    
    swp->ConvertCARD16	    = ConversionFunction[from][to].s;
    swp->ConvertCARD32	    = ConversionFunction[from][to].l;
    swp->ConvertFLOAT	    = ConversionFunction[from][to].f;
}


/* Convert Archive File Descriptor */
phg_ar_convert_afd(d)
Phg_ar_descriptor *d;
{
    d->opcode	= PHG_AR_AFD;
    CONVERT_CARD32(swp, d->phigs_version);
    CONVERT_CARD32(swp, d->version);
    CONVERT_CARD16(swp, d->length);
}


phg_ar_convert_bse(b)
Phg_ar_begin_struct *b;
{
    b->opcode	= PHG_AR_BSE;
    CONVERT_CARD32(swp, b->id);
    CONVERT_CARD32(swp, b->nelts);
    CONVERT_CARD32(swp, b->length);
}


phg_ar_convert_afs(f)
Phg_ar_free_space *f;
{
    f->opcode	= PHG_AR_AFS;
    CONVERT_CARD32(swp, f->length);
}


phg_ar_convert_afi(index)
Phg_ar_index *index;
{
    index->opcode   = PHG_AR_AFI;
    CONVERT_CARD16(swp, index->numUsed);
    CONVERT_CARD16(swp, index->numAvail);
    CONVERT_CARD32(swp, index->nextpos);
    CONVERT_CARD32(swp, index->length);
}


phg_ar_convert_afie(n, e)
int n;
Phg_ar_index_entry *e;
{
    int i;

    for (i = 0; i < n; i++) {
    	CONVERT_CARD32(swp, (e[i].length));
    	CONVERT_CARD32(swp, (e[i].position));
    	CONVERT_CARD32(swp, (e[i].str));
    	CONVERT_CARD32(swp, (e[i].nelts));
    }
}

void
phg_ar_convert_elements(nelts, buffer, direction)
int   			     nelts;
char			    *buffer;
Phg_ar_archiving_direction   direction;
{
    register char      *ptr = buffer;
    pexElementInfo     *head;
    register int	command;
    register CARD16	type;
    CARD16		length;
    CARD16	      (*localswapshort)();
    extern OCFunction	cPEXOutputCmd[];
    extern OCFunction	uPEXOutputCmd[];

    /* if the formats are there are no conversions that will need to be
     * performed, then just return */
     
    if (!(swp->ConvertCARD16) && !(swp->ConvertCARD32) && !(swp->ConvertFLOAT))
	return;
	

    localswapshort = ConversionFunction[fromFormat][PHG_AR_HOST_BYTE_ORDER |
						  PHG_AR_HOST_FLOAT_FORMAT].s;

    /* For each element in the structure */
    for (command = 0; command < nelts; command++) {
    
	head = (pexElementInfo *)ptr;

	if (direction == PHG_AR_READING_ARCHIVE) {
	
	    /* we are reading fram an archive so we must 'decode' */
	    if (localswapshort != NULL) {
		type = (*localswapshort)(head->elementType);
		length = (*localswapshort)(head->length);
	    } else {
		type = head->elementType;
		length = head->length;
	    }
	    (*cPEXOutputCmd[type])(swp, ptr);
	    
	} else {
	
	    /* we are writing to an archive, so we must 'encode' */
	    type = head->elementType;
	    length = head->length;
	    (*uPEXOutputCmd[type])(swp, ptr);
	    
	}
	
	ptr += length * sizeof(CARD32);

    }
    
    return;

}
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