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/*
* This is the main routine for the first (prescanning) pass.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
/*
* These are all the external routines it calls:
*/
#include "protos.h"
/*
* These are the globals it accesses.
*/
#ifdef DEBUG
extern integer debug_flag;
#endif /* DEBUG */
extern fontdesctype *fonthead ;
extern integer firstpage, lastpage ;
extern integer firstseq, lastseq ;
extern Boolean notfirst, notlast ;
extern Boolean evenpages, oddpages, pagelist ;
extern integer maxpages ;
extern Boolean abspage ;
extern FILE *dvifile ;
extern fontdesctype *curfnt ;
extern fontmaptype *ffont ;
extern quarterword *curpos, *curlim ;
extern integer pagenum ;
extern char errbuf[] ;
extern frametype frames[] ;
extern Boolean noomega ;
/*
* We declare this to tell everyone we are prescanning early.
*/
Boolean pprescan ;
/*
* When a font is selected during the pre-prescan, this routine makes sure
* that the tfm or vf (but not pk) file is loaded.
*/
static void
ppreselectfont(fontdesctype *f)
{
int i ;
curfnt = f ;
if (curfnt->loaded == 0) {
if (!residentfont(curfnt))
if (!virtualfont(curfnt)) {
for (i=0; i<256; i++)
curfnt->chardesc[i].flags = 0 ;
curfnt->loaded = 3 ; /* we're scanning for sizes */
}
}
}
/*
* Now our scanpage routine.
*/
static void
pscanpage(void)
{
register shalfword cmd ;
register chardesctype *cd ;
register fontmaptype *cfnt = 0 ;
integer fnt ;
integer mychar ;
register frametype *frp = frames ;
#ifdef DEBUG
if (dd(D_PAGE))
#ifdef SHORTINT
(void)fprintf(stderr,"PPrescanning page %ld\n", pagenum) ;
#else /* ~SHORTINT */
(void)fprintf(stderr,"PPrescanning page %d\n", pagenum) ;
#endif /* ~SHORTINT */
#endif /* DEBUG */
curfnt = NULL ;
curpos = NULL ;
bopcolor(0) ;
while (1) {
switch (cmd=dvibyte()) {
case 130: case 131: case 135: case 136: case 139:
case 247: case 248: case 249: case 250: case 251: case 252: case 253:
case 254: case 255: /* unimplemented or illegal commands */
(void)sprintf(errbuf,
"! DVI file contains unexpected command (%d)",cmd) ;
error(errbuf) ;
case 132: case 137: /* eight-byte commands setrule, putrule */
(void)dvibyte() ;
(void)dvibyte() ;
(void)dvibyte() ;
(void)dvibyte() ;
case 146: case 151: case 156: case 160: case 165: case 170:
/* four-byte commands right4, w4, x4, down4, y4, z4 */
(void)dvibyte() ;
case 145: case 150: case 155: case 159: case 164: case 169:
/* three-byte commands right3, w3, x3, down3, y3, z3 */
(void)dvibyte() ;
case 144: case 149: case 154: case 158: case 163: case 168:
/* two-byte commands right2, w2, x2, down2, y2, z2 */
(void)dvibyte() ;
case 143: case 148: case 153: case 157: case 162: case 167:
/* one-byte commands right1, w1, x1, down1, y1, z1 */
(void)dvibyte() ;
case 147: case 152: case 161: case 166: /* w0, x0, y0, z0 */
case 138: case 141: case 142: /* nop, push, pop */
break ;
case 134: case 129: /* set2, put2 */
if (noomega) {
(void)sprintf(errbuf,
"! DVI file contains unexpected Omega command (%d)",cmd) ;
error(errbuf) ;
}
mychar = dvibyte() ; mychar = (mychar << 8) + dvibyte() ;
goto dochar ;
case 133: case 128: cmd = dvibyte() ; /* set1, put1 commands drops through */
default: /* these are commands 0 (setchar0) thru 127 (setchar 127) */
mychar = cmd ;
dochar:
if (curfnt==NULL)
error("! Bad DVI file: no font selected") ;
if (mychar>=curfnt->maxchars) {
(void)sprintf(errbuf,"! invalid char %d from font %s", mychar, curfnt->name) ;
error(errbuf) ;
}
if (curfnt->loaded == 2) { /* scanning a virtual font character */
frp->curp = curpos ;
frp->curl = curlim ;
frp->ff = ffont ;
frp->curf = curfnt ;
if (++frp == &frames[MAXFRAME] )
error("! virtual recursion stack overflow") ;
cd = curfnt->chardesc + mychar;
if (cd->packptr == 0)
error("! a non-existent virtual char is being used; check vf/tfm files") ;
curpos = cd->packptr + 2 ;
curlim = curpos + (256*(long)(*cd->packptr)+(*(cd->packptr+1))) ;
ffont = curfnt->localfonts ;
if (ffont==NULL)
curfnt = NULL ;
else
ppreselectfont(ffont->desc) ;
} else if (curfnt->loaded == 3)
curfnt->chardesc[mychar].flags = EXISTS ;
break ;
case 171: case 172: case 173: case 174: case 175: case 176: case 177:
case 178: case 179: case 180: case 181: case 182: case 183: case 184:
case 185: case 186: case 187: case 188: case 189: case 190: case 191:
case 192: case 193: case 194: case 195: case 196: case 197: case 198:
case 199: case 200: case 201: case 202: case 203: case 204: case 205:
case 206: case 207: case 208: case 209: case 210: case 211: case 212:
case 213: case 214: case 215: case 216: case 217: case 218: case 219:
case 220: case 221: case 222: case 223: case 224: case 225: case 226:
case 227: case 228: case 229: case 230: case 231: case 232: case 233:
case 234: case 235: case 236: case 237: case 238: /* font selection commands */
if (cmd < 235) fnt = cmd - 171 ; /* fntnum0 thru fntnum63 */
else {
fnt = dvibyte() ; /* fnt1 */
while (cmd-- > 235)
fnt = (fnt << 8) + dvibyte() ;
}
for (cfnt=ffont; cfnt; cfnt = cfnt->next)
if (cfnt->fontnum == fnt) goto fontfound ;
error("! no font selected") ;
fontfound: curfnt = cfnt->desc ;
ppreselectfont(curfnt) ;
break ;
case 239: predospecial((integer)dvibyte(), 1) ; break ; /* xxx1 */
case 240: predospecial((integer)twobytes(), 1) ; break ; /* xxx2 */
case 241: predospecial(threebytes(), 1) ; break ; /* xxx3 */
case 242: predospecial(signedquad(), 1) ; break ; /* xxx4 */
case 243: case 244: case 245: case 246: fontdef(cmd-242) ; break ; /* fntdef1 */
case 140: /* eop or end of virtual char */
if (curpos) {
--frp ;
curfnt = frp->curf ;
ffont = frp->ff ;
curlim = frp->curl ;
curpos = frp->curp ;
break ;
}
return ;
}
}
}
/*
* Finally, here's our main pprescan routine.
*/
static integer firstmatch = -1, lastmatch = -1 ;
void
pprescanpages(void)
{
register int cmd ;
integer lmaxpages = maxpages ;
integer mpagenum ;
integer pageseq = 0 ;
int ntfirst = notfirst ;
pprescan = 1 ;
readpreamble() ;
/*
* Now we look for the first page to process. If we get to the end of
* the file before the page, we complain (fatally).
* Incidentally, we don't use the DVI file's bop backpointer to skip
* over pages at high speed, because we want to look to for special
* header that might be in skipped pages.
*/
while (1) {
cmd = skipnop() ;
if (cmd==248)
error("! End of document before first specified page") ;
if (cmd!=139)
error("! Bad DVI file: expected bop") ;
pagenum = signedquad() ;
pageseq++ ;
mpagenum = abspage ? pageseq : pagenum ;
if (mpagenum == firstpage && ntfirst)
firstmatch++ ;
if (mpagenum == lastpage && notlast)
lastmatch++ ;
if (ntfirst && mpagenum == firstpage && firstmatch == firstseq)
ntfirst = 0 ;
if (ntfirst ||
((evenpages && (pagenum & 1)) || (oddpages && (pagenum & 1)==0) ||
(pagelist && !InPageList(pagenum)))) {
skipover(40) ;
skippage() ;
} else {
if (notlast && mpagenum == lastpage)
lastmatch-- ;
break ;
}
}
/*
* Here we scan for each of the sections. First we initialize some of
* the variables we need. We don't have to be as smart as before in
* skipping pages.
*/
skipover(40) ;
while (lmaxpages > 0) {
if (!(evenpages && (pagenum & 1)) &&
!(oddpages && (pagenum & 1)==0) &&
!(pagelist && !InPageList(pagenum))) {
pscanpage() ;
lmaxpages-- ;
} else
skippage() ;
mpagenum = abspage ? pageseq : pagenum ;
if (mpagenum == lastpage && notlast)
lastmatch++ ;
if (notlast && mpagenum == lastpage && lastmatch == lastseq)
lmaxpages = -1 ; /* we are done after this page. */
cmd=skipnop() ;
if (cmd==248) break ;
if (cmd!=139)
error("! Bad DVI file: expected bop") ;
pagenum = signedquad() ;
skipover(40) ;
pageseq++ ;
}
fseek(dvifile, 0L, 0) ;
pprescan = 0 ;
}
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