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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"
/*
* This routine handles the processing of the preamble in the dvi file.
*/
void
readpreamble(void)
{
register int i;
char *p;
if (dvibyte()!=247) error("! Bad DVI file: first byte not preamble");
if (dvibyte()!=2) error("! Bad DVI file: id byte not 2");
num = signedquad();
den = signedquad();
if (overridemag > 0) signedquad();
else if (overridemag < 0) mag = (mag * signedquad()) / 1000.0;
else mag = signedquad();
conv = (real) num * DPI * mag / ( den * 254000000.0 );
vconv = (real) num * VDPI * mag / ( den * 254000000.0 );
alpha = (((real)den / 7227.0) / 0x100000) * (25400000.0 / (real) num);
fsizetol = 1 + (integer)(DPI/(72270.0 * conv));
if (!pprescan) {
for (i=dvibyte(),p=preamblecomment;i>0;i--,p++) *p=dvibyte();
*p='\0';
if (!quiet) {
fprintf(stderr, "'");
#ifdef VMCMS /* IBM: VM/CMS */
for(p=preamblecomment;*p;p++) putc(ascii2ebcdic[*p], stderr);
#else
#ifdef MVSXA /* IBM: MVS/XA */
for(p=preamblecomment;*p;p++) putc(ascii2ebcdic[*p], stderr);
#else
for(p=preamblecomment;*p;p++) putc(*p, stderr);
#endif /* IBM: VM/CMS */
#endif
fprintf(stderr, "' -> %s\n", oname);
}
} else
skipover(dvibyte());
}
/*
* Finally, here's our main prescan routine.
*/
static integer firstmatch = -1, lastmatch = -1;
void
prescanpages(void)
{
register int cmd;
short ret = 0;
register integer thispageloc, thissecloc;
register fontdesctype *f;
register shalfword c;
register long thissectionmem = 0;
integer mpagenum;
integer pageseq = 0;
int ntfirst = notfirst;
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");
thispageloc = ftell(dvifile); /* the location FOLLOWING the bop */
#ifdef DEBUG
if (dd(D_PAGE))
#ifdef SHORTINT
fprintf(stderr,"bop at %ld\n", thispageloc);
#else /* ~SHORTINT */
fprintf(stderr,"bop at %d\n", (int)thispageloc);
#endif /* ~SHORTINT */
#endif /* DEBUG */
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.
*/
while (maxpages > 0 && cmd != 248) {
for (f=fonthead; f; f=f->next) {
f->psname = 0;
if (f->loaded==1)
for (c=255; c>=0; c--)
f->chardesc[c].flags &= (STATUSFLAGS);
}
fontmem = swmem - OVERCOST;
if (fontmem <= 1000)
error("! Too little VM in printer");
/* The section begins at the bop command just before thispageloc (which may
* be a page that was aborted because the previous section overflowed memory).
*/
pagecount = 0;
fseek(dvifile, (long)thispageloc, 0);
pagenum = signedquad();
skipover(40);
thissecloc = thispageloc;
/*
* Now we have the loop that actually scans the pages. The scanpage routine
* returns 1 if the page scans okay; it returns 2 if the memory ran out
* before any pages were completed (in which case we'll try to carry on
* and hope for the best); it returns 0 if a page was aborted for lack
* of memory. After each page, we mark the characters seen on that page
* as seen for this section so that they will be downloaded.
*/
ret = 0;
while (maxpages>0) {
if (!(evenpages && (pagenum & 1)) &&
!(oddpages && (pagenum & 1)==0) &&
!(pagelist && !InPageList(pagenum))) {
ret = scanpage();
if (ret == 0)
break;
pagecount++;
maxpages--;
} else
skippage();
thissectionmem = swmem - fontmem - OVERCOST;
mpagenum = abspage ? pageseq : pagenum;
pageseq++;
if (mpagenum == lastpage && notlast)
lastmatch++;
if (notlast && mpagenum == lastpage && lastmatch == lastseq)
maxpages = -1; /* we are done after this page. */
if (reverse)
thissecloc = thispageloc;
for (f=fonthead; f; f=f->next)
if (f->loaded==1) {
if (f->psflag & THISPAGE)
f->psflag = PREVPAGE;
for (c=255; c>=0; c--)
if (f->chardesc[c].flags & THISPAGE)
f->chardesc[c].flags = PREVPAGE |
(f->chardesc[c].flags & (STATUSFLAGS));
}
cmd=skipnop();
if (cmd==248) break;
if (cmd!=139)
error("! Bad DVI file: expected bop");
thispageloc = ftell(dvifile);
#ifdef DEBUG
if (dd(D_PAGE))
#ifdef SHORTINT
fprintf(stderr,"bop at %ld\n", thispageloc);
#else /* ~SHORTINT */
fprintf(stderr,"bop at %d\n", (int)thispageloc);
#endif /* ~SHORTINT */
#endif /* DEBUG */
pagenum = signedquad();
skipover(40);
if (ret==2 || (maxsecsize && pagecount >= maxsecsize))
break;
}
/*
* Now we have reached the end of a section for some reason.
* If there are any pages, we save the pagecount, section location,
* and continue.
*/
if (pagecount>0) {
register int fc = 0;
register sectiontype *sp;
register charusetype *cp;
totalpages += pagecount;
for (f=fonthead; f; f=f->next)
if (f->loaded==1 && f->psname)
fc++;
sp = (sectiontype *)mymalloc((integer)(sizeof(sectiontype) +
fc * sizeof(charusetype) + sizeof(fontdesctype *)));
sp->bos = thissecloc;
if (reverse) {
sp->next = sections;
sections = sp;
} else {
register sectiontype *p;
sp->next = NULL;
if (sections == NULL)
sections = sp;
else {
for (p=sections; p->next != NULL; p = p->next);
p->next = sp;
}
}
sp->numpages = pagecount;
#ifdef DEBUG
if (dd(D_PAGE))
#ifdef SHORTINT
fprintf(stderr,"Have a section: %ld pages at %ld fontmem %ld\n",
#else /* ~SHORTINT */
fprintf(stderr,"Have a section: %d pages at %d fontmem %d\n",
#endif /* ~SHORTINT */
(integer)pagecount, (integer)thissecloc, (integer)thissectionmem);
#endif /* DEBUG */
cp = (charusetype *) (sp + 1);
fc = 0;
for (f=fonthead; f; f=f->next)
if (f->loaded==1 && f->psname) {
register halfword b, bit;
cp->psfused = (f->psflag & PREVPAGE);
f->psflag = 0;
cp->fd = f;
c = 0;
for (b=0; b<16; b++) {
cp->bitmap[b] = 0;
for (bit=32768; bit!=0; bit>>=1) {
if (f->chardesc[c].flags & PREVPAGE)
cp->bitmap[b] |= bit;
c++;
}
}
cp++;
}
cp->fd = NULL;
}
}
}
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