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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! */
/*
* The external declarations:
*/
#include "protos.h"
/*
* 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 255: /* pTeX's dir or undefined */
if (!noptex) {
(void)dvibyte();
break;
}
/* illegal commands */
case 131: case 136: case 139: /* set4, put4, bop */
case 247: case 248: case 249: /* pre, post, post_post */
case 250: case 251: case 252: case 253: case 254: /* undefined */
(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 130: case 135: /* set3, put3 */
if (noptex) {
(void)sprintf(errbuf,
"! DVI file contains unexpected pTeX command (%d)",cmd);
error(errbuf);
}
mychar = dvibyte(); mychar = (mychar << 8) + dvibyte();
mychar = (mychar << 8) + dvibyte();
goto dochar;
case 129: case 134: /* 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 128: case 133: 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) {
fprintf(stderr, "Wrong char code: %04X\n", mychar);
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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