/*
 * Copyright (c) 1987, 1989 University of Maryland
 * Department of Computer Science.  All rights reserved.
 * Permission to copy for any purpose is hereby granted
 * so long as this copyright notice remains intact.
 */

#ifndef lint
static char rcsid[] = "$Header: /usr/local/src/SeeTeX/libtex/RCS/scanpost.c,v 1.2 90/07/10 14:33:23 grunwald Exp Locker: grunwald $";
#endif

/*
 * ScanPostAmble - read a DVI postamble.
 */

#include <stdio.h>
#include "types.h"
#include "dvicodes.h"
#include "fio.h"
#include "gripes.h"
#include "postamble.h"

ScanPostAmble(f, headerfunc, fontfunc)
	register FILE *f;
	void (*headerfunc)();
	register void (*fontfunc)();
{
	register int n;
	register char *s;
	char name[512];

	if (FindPostAmble(f)) {
		GripeCannotFindPostamble();
		return(1);
	      }
	if (GetByte(f) != Sign8(DVI_POST)) {
		GripeMissingOp("POST");
		return(1);
	      }

	/* Read the postamble info stuff. */
	{
		struct PostAmbleInfo pai;
		register struct PostAmbleInfo *p = &pai;

		p->pai_PrevPagePointer = GetLong(f);
		p->pai_Numerator = GetLong(f);
		p->pai_Denominator = GetLong(f);
		p->pai_DVIMag = GetLong(f);
		p->pai_TallestPageHeight = GetLong(f);
		p->pai_WidestPageWidth = GetLong(f);
		p->pai_DVIStackSize = GetWord(f);
		p->pai_NumberOfPages = GetWord(f);

		(*headerfunc)(p);
	}

	/* Now read all the font definitions. */
	{
		struct PostAmbleFont paf;
		register struct PostAmbleFont *p = &paf;
		int c;

		for (;;) {
			if ((c = getc(f)) == EOF)
				GripeUnexpectedDVIEOF();
			switch (c) {

			case DVI_NOP:
				break;

			case DVI_FNTDEF1:
				p->paf_DVIFontIndex = UnSign8(getc(f));
				break;

			case DVI_FNTDEF2:
				p->paf_DVIFontIndex = UnSign16(GetWord(f));
				break;

			case DVI_FNTDEF3:
				p->paf_DVIFontIndex = UnSign24(Get3Byte(f));
				break;

			case DVI_FNTDEF4:
				p->paf_DVIFontIndex = GetLong(f);
				break;

			case DVI_POSTPOST:
				return(0);

			default:
				GripeMissingOp("POSTPOST");
				return(1);
				/*NOTREACHED*/
			}
			p->paf_DVIChecksum = GetLong(f);
			p->paf_DVIMag = GetLong(f);
			p->paf_DVIDesignSize = GetLong(f);
			p->paf_n1 = UnSign8(getc(f));
			p->paf_n2 = UnSign8(getc(f));
			p->paf_name = name;	/* never trust people not to
						   clobber it */
			n = p->paf_n1 + p->paf_n2;
			s = name;
			while (--n >= 0)
				*s++ = GetByte(f);
			*s = 0;
			(*fontfunc)(p);
		}
	}
}