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    Length: 3706 (0xe7a)
    Types: TextFile
    Names: »pe2ps.c«

└─⟦2d1937cfd⟧ Bits:30007241 EUUGD22: P.P 5.0
    └─⟦dc59850a2⟧ »EurOpenD22/pp5.0/pp-5.tar.Z« 
        └─⟦e5a54fb17⟧ 
            └─⟦this⟧ »pp-5.0/Chans/x40088/pe2ps.c« 

TextFile

/* pe2ps.c - presentation element to presentation stream */

# ifndef lint
static char Rcsid[] = "@(#)$Header: /cs/research/pp/hubris/pp-beta/Chans/x40088/RCS/pe2ps.c,v 5.0 90/09/20 15:57:25 pp Exp Locker: pp $";
# endif

/*
 * $Header: /cs/research/pp/hubris/pp-beta/Chans/x40088/RCS/pe2ps.c,v 5.0 90/09/20 15:57:25 pp Exp Locker: pp $
 *
 * $Log:	pe2ps.c,v $
 * Revision 5.0  90/09/20  15:57:25  pp
 * rcsforce : 5.0 public release
 * 
 */



/*
 *				  NOTICE
 *
 *    Acquisition, use, and distribution of this module and related
 *    materials are subject to the restrictions of a license agreement.
 *    Consult the Preface in the User's Manual for the full terms of
 *    this agreement.
 *
 */


/* LINTLIBRARY */

#include <stdio.h>
#include <isode/psap.h>
#include <isode/tailor.h>

/* \f

   DATA */

static PElement pe_eoc = { PE_CLASS_UNIV, PE_FORM_PRIM, PE_UNIV_EOC, 0 };

/* \f

 */

int	pe2ps_aux (ps, pe, eval)
register PS	ps;
register PE	pe;
int	eval;
{
    int     result;

    if (eval > 0)
	switch (pe -> pe_form) {
	    case PE_FORM_PRIM: 
	    case PE_FORM_ICONS: 
		break;

	    case PE_FORM_CONS: 
		(void) ps_get_abs (pe);
		break;
	}

    if ((result = pe2ps_aux2 (ps, pe, eval)) != NOTOK)
	result = ps_flush (ps);

    return result;
}


static int  pe2ps_aux2 (ps, pe, eval)
register PS	ps;
register PE	pe;
int	eval;
{
    register PE	    p;

    if (pe -> pe_form == PE_FORM_ICONS) {
	if (ps_write_aux (ps, pe -> pe_prim, pe -> pe_len, 1) == NOTOK)
	    return NOTOK;

	return OK;
    }
    
    if (ps_write_id (ps, pe) == NOTOK || ps_write_len (ps, pe) == NOTOK)
	return NOTOK;

    switch (pe -> pe_form) {
	case PE_FORM_PRIM: 
	    if (ps_write_aux (ps, pe -> pe_prim, pe -> pe_len, 1) == NOTOK)
		return NOTOK;
	    break;

	case PE_FORM_CONS: 
	    if (eval < 0)
		    break;
	    if (pe -> pe_len) {
		for (p = pe -> pe_cons; p; p = p -> pe_next)
		    if (pe2ps_aux2 (ps, p, 0) == NOTOK)
			return NOTOK;

		if (pe -> pe_len == PE_LEN_INDF
			&& pe2ps_aux2 (ps, &pe_eoc, 0) == NOTOK)
		    return NOTOK;
	    }
	    break;
    }

    return OK;
}

/* \f

 */

static int  ps_write_id (ps, pe)
register PS	ps;
register PE	pe;
{
    byte    buffer[1 + sizeof (PElementID)];
    register byte  *bp = buffer;
    PElementForm    form;
    register PElementID id;

    if ((form = pe -> pe_form) == PE_FORM_ICONS)
	form = PE_FORM_CONS;
    *bp = ((pe -> pe_class << PE_CLASS_SHIFT) & PE_CLASS_MASK)
		| ((form << PE_FORM_SHIFT) & PE_FORM_MASK);

    if ((id = pe -> pe_id) < PE_ID_XTND)
	*bp++ |= id;
    else {
	register byte *ep;
	register PElementID jd;

	*bp |= PE_ID_XTND;

	ep = buffer;
	for (jd = id; jd != 0; jd >>= PE_ID_SHIFT)
	    ep++;

	for (bp = ep; id != 0; id >>= PE_ID_SHIFT)
	    *bp-- = id & PE_ID_MASK;
	for (bp = buffer + 1; bp < ep; bp++)
	    *bp |= PE_ID_MORE;

	bp = ++ep;
    }

    if (ps_write (ps, buffer, bp - buffer) == NOTOK)
	return NOTOK;

    return OK;
}

/* \f

 */

/* probably should integrate the non-PE_LEN_SMAX case with the algorithm in
   num2prim() for a single, unified routine */

static int  ps_write_len (ps, pe)
register PS	ps;
register PE	pe;
{
    byte    buffer[1 + sizeof (PElementLen)];
    register byte  *bp = buffer,
		   *ep;
    register PElementLen len;

    if ((len = pe -> pe_len) == PE_LEN_INDF)
	*bp++ = PE_LEN_XTND;
    else
	if (len <= PE_LEN_SMAX)
	    *bp++ = len & 0xff;
	else {
	    ep = buffer + sizeof buffer - 1;
	    for (bp = ep; len != 0 && buffer < bp; len >>= 8)
		*bp-- = len & 0xff;
	    *bp = PE_LEN_XTND | ((ep - bp) & 0xff);
	    if (ps_write (ps, bp, ep - bp + 1) == NOTOK)
		return NOTOK;

	    return OK;
	}

    if (ps_write (ps, buffer, bp - buffer) == NOTOK)
	return NOTOK;

    return OK;
}