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/*
* This routine scans a page for font definitions and character usage.
* It keeps an estimate of the memory remaining in the printer, and
* returns false when that memory is exhausted, unless scanning the
* first page. Otherwise it returns 1 if no problems were found,
* or 2 if it thinks the first page of a section may overflow memory.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
/*
* The external declarations:
*/
#include "protos.h"
/*
* Charge pagecost for the cost of showing the character that *cd refers to
* and charge fontmem for the cost of downloading the character if necessary.
* A zero result indicates that we have run out of memory.
* If the character is small (a small packet), we save 43 bytes (since we
* use a single string instead of an array with integers in the PostScript.)
*/
Boolean
prescanchar(chardesctype *cd)
{
register quarterword *cras;
register integer thischar;
if ((cd->flags & (PREVPAGE | THISPAGE)) == 0) {
/* the character hasn't been used before in the current section */
cras = cd->packptr;
if (curfnt->resfont) {
thischar = PSCHARCOST;
cd->flags |= THISPAGE;
} else if (cras != NULL) {
thischar = CHARCOST;
if (cd->flags & BIGCHAR)
thischar += 43;
if (compressed) {
if ((cd->flags & REPACKED) == 0) {
repack(cd);
cras = cd->packptr;
}
if ((*cras & 4))
if ((*cras & 7) == 7)
thischar += getlong(cras + 17);
else
thischar += getlong(cras + 9);
else
thischar += getlong(cras + 5);
} else {
if ((*cras & 4))
if ((*cras & 7) == 7)
thischar += getlong(cras + 1)
* ((getlong(cras + 5) + 7) >> 3);
else
thischar += (cras[3] * 256L + cras[4]) *
((cras[1] * 256L + cras[2] + 7) >> 3);
else
thischar += ((long)(cras[2] * ((cras[1] + 7) >> 3)));
}
cd->flags |= THISPAGE;
} else
thischar = 0;
fontmem -= thischar;
if (fontmem <= pagecost) {
if (pagecount > 0)
return(0);
}
}
return(1);
}
/*
* When a font is selected during the prescan, this routine makes sure that
* the tfm or pk file is loaded and charges fontmem for the VM overhead in
* creating the font. The result is true unless the section must be aborted
* in order to keep this font from overflowing VM.
*/
Boolean
preselectfont(fontdesctype *f)
{
curfnt = f;
if (curfnt->loaded == 0 || curfnt->loaded == 3) {
if (!residentfont(curfnt))
if (!virtualfont(curfnt))
loadfont(curfnt);
}
if (curfnt->psname == 0) {
if (curfnt->loaded < 2) { /* virtual font costs nothing (yet) */
if (curfnt->resfont)
fontmem -= PSFONTCOST;
else {
fontmem -= FONTCOST + curfnt->maxchars;
if (curfnt->loadeddpi != curfnt->dpi)
fontmem -= 48; /* for the new font matrix */
}
}
curfnt->psname = 1;
if (fontmem <= pagecost) {
if (pagecount > 0)
return(0);
}
}
return(1);
}
/*
* Now our scanpage routine.
*/
short
scanpage(void)
{
register shalfword cmd;
register chardesctype *cd;
register fontmaptype *cfnt = 0;
integer fnt;
integer mychar;
register frametype *frp = frames;
if (firstboploc == 0)
firstboploc = ftell(dvifile);
pagecost = 0;
#ifdef DEBUG
if (dd(D_PAGE))
#ifdef SHORTINT
fprintf(stderr,"Scanning page %ld\n", pagenum);
#else /* ~SHORTINT */
fprintf(stderr,"Scanning page %d\n", pagenum);
#endif /* ~SHORTINT */
#endif /* DEBUG */
curfnt = NULL;
curpos = NULL;
bopcolor(0); /* IBM: color - put current colorstack to bopstackdepth */
while (1) {
switch (cmd=dvibyte()) {
case 255: /* pTeX's dir or undefined */
if (!noptex) {
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 */
sprintf(errbuf,
"! DVI file contains unexpected command (%d)",cmd);
error(errbuf);
case 132: case 137: /* eight-byte commands setrule, putrule */
dvibyte();
dvibyte();
dvibyte();
dvibyte();
case 146: case 151: case 156: case 160: case 165: case 170:
/* four-byte commands right4, w4, x4, down4, y4, z4 */
dvibyte();
case 145: case 150: case 155: case 159: case 164: case 169:
/* three-byte commands right3, w3, x3, down3, y3, z3 */
dvibyte();
case 144: case 149: case 154: case 158: case 163: case 168:
/* two-byte commands right2, w2, x2, down2, y2, z2 */
dvibyte();
case 143: case 148: case 153: case 157: case 162: case 167:
/* one-byte commands right1, w1, x1, down1, y1, z1 */
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) {
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 && noptex) {
sprintf(errbuf,
"! DVI file contains unexpected 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:
/*
* We are going to approximate that each string of consecutive characters
* requires (length of string) bytes of PostScript VM.
*/
if (curfnt==NULL)
error("! Bad DVI file: no font selected");
if (mychar>=curfnt->maxchars) {
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 character 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 if (!preselectfont(ffont->desc))
goto outofmem;
} else {
pagecost++;
if (!prescanchar(curfnt->chardesc + mychar))
goto outofmem;
}
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;
printf("Font number %d not found\n", fnt);
error("! no font selected");
fontfound: curfnt = cfnt->desc;
if (!preselectfont(curfnt))
goto outofmem;
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;
}
goto endofpage; /* eop */
}
}
endofpage:
if (fontmem > pagecost)
return(1);
if (pagecount > 0) {
return(0);
} /* IBM: color */
#ifdef SHORTINT
fprintf(stderr, "Page %ld may be too complex to print\n", pagenum);
#else /* ~SHORTINT */
fprintf(stderr, "Page %d may be too complex to print\n", pagenum);
#endif /* ~SHORTINT */
/*
* This case should be rare indeed. Even with only 200K of virtual memory,
* at 11 bytes per char, you can have 18K characters on a page.
*/
return(2);
outofmem:
if (frp != frames) {
curpos = frames->curp;
curlim = frames->curl;
ffont = frames->ff;
curfnt = frames->curf;
}
return 0;
}
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