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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:
- */
- extern shalfword dvibyte() ;
- extern halfword twobytes() ;
- extern integer threebytes() ;
- extern integer signedquad() ;
- extern shalfword signedbyte() ;
- extern shalfword signedpair() ;
- extern integer signedtrio() ;
- extern void skipover() ;
- extern void fontdef() ;
- extern void predospecial() ;
- extern int residentfont() ;
- extern Boolean virtualfont() ;
- extern void error() ;
- extern long getlong() ;
- extern int skipnop() ;
- extern void skippage() ;
- extern void readpreamble() ;
- extern void bopcolor() ;
- extern int InPageList() ;
- /*
- * 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 fontdesctype *baseFonts[] ;
- extern fontmaptype *ffont ;
- extern quarterword *curpos, *curlim ;
- extern integer pagenum ;
- extern char errbuf[] ;
- extern frametype frames[] ;
- /*
- * 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(f)
- 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()
- {
- register shalfword cmd ;
- register chardesctype *cd ;
- register fontmaptype *cfnt = 0 ;
- integer fnt ;
- 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 129: case 130: case 131: case 134: 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 133: case 128: cmd = dvibyte() ; /* set1 commands drops through */
- default: /* these are commands 0 (setchar0) thru 127 (setchar 127) */
- if (curfnt==NULL)
- error("! Bad DVI file: no font selected") ;
- 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 + cmd ;
- 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[cmd].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() ;
- }
- if (curpos || fnt > 255) {
- for (cfnt=ffont; cfnt; cfnt = cfnt->next)
- if (cfnt->fontnum == fnt) goto fontfound ;
- } else
- if (0 != (curfnt = baseFonts[fnt]))
- goto fontfound2 ;
- error("! no font selected") ;
- fontfound: curfnt = cfnt->desc ;
- fontfound2: 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()
- {
- 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 ;
- }
-