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/* $Log: preamble.c,v $
* Revision 0.8 92/11/23 19:46:54 19:46:54 bt (Bo Thide')
* Fixed resolution bug. Portable downloading. Added/changed options. PJXL color support
*
* Revision 0.7 92/11/13 02:41:39 02:41:39 bt (Bo Thide')
* More bug fixes and improvements. Support for PaintJet XL
*
* Revision 0.6 92/11/10 21:48:37 21:48:37 bt (Bo Thide')
* Bug fixes. Added -R option. Better font handling.
*
* Revision 0.5 92/11/09 16:25:43 16:25:43 bt (Bo Thide')
* Rewrite of dospecial.c. Extended \special support
*
* Revision 0.4 92/11/08 02:45:59 02:45:59 bt (Bo Thide')
* Changed to portable bit manipulations. Replaced strrstr for non-POSIX compliant C. Fixed numerous bugs. Added support for more \special's.
*
* Revision 0.3 92/08/24 12:45:49 12:45:49 bt (Bo Thide')
* Fixed 8 bit (dc font) support.
*
* Revision 0.2 92/08/23 17:29:00 17:29:00 bt (Bo Thide')
* Source cleaned up. Changed certain function calls. Removed globals.
*
* Revision 0.1 92/08/22 23:58:48 23:58:48 bt (Bo Thide')
* First Release.
* */
/*
* This routine processes the preamble and determines the global variables
* 'conv' and 'magnification'. It exits if a fatal error is found in the
* preamble.
*/
#include <stdio.h>
#include "dvi.h"
#include "globals.h"
#include "macros.h"
static char rcsid[] = "$Header: preamble.c,v 0.8 92/11/23 19:46:54 bt Exp $";
preamble(dvifile, resolution)
FILE *dvifile;
short resolution;
{
ubyte p;
if(getubyte(dvifile) != DVI_PRE)
sterror("Bad %s file: First byte is not start of preamble\n",
DVIFILE_SUFFIX);
if(getubyte(dvifile) != 2)
fprintf(stderr,"Identifier in byte 1 should be '2'");
numerator = (long)getsquad(dvifile);
denominator = (long)getsquad(dvifile);
#ifdef DEBUG
fprintf (stderr,"preamble: numerator=%d, denominator=%d\n",numerator,denominator);
#endif /* DEBUG */
if(numerator <= 0)
valerror("Bad .dvi file: Numerator is %d\n" , numerator);
if(denominator <= 0 )
valerror("Bad .dvi file: Denominator is %d\n" , denominator);
magnification = (long)getsquad(dvifile);
conv = ((double)numerator/254000.0)*(double)resolution*(double)magnification/((double)denominator*1000.0) ;
#ifdef DEBUG
fprintf (stderr,"preamble: magnification=%d, conv=%g\n",magnification,conv);
#endif /* DEBUG */
p = getubyte(dvifile);
#ifdef DEBUG2
fprintf (stderr,"preamble: p = %d\n",p);
#endif /* DEBUG2 */
}
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