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/*
* pdf.c
*
* pdf file support for page
*/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <cursor.h>
#include <thread.h>
#include <bio.h>
#include "page.h"
static Image* pdfdrawpage(Document *d, int page);
static char* pdfpagename(Document*, int);
char *pdfprolog =
#include "pdfprolog.c"
;
Rectangle
pdfbbox(GSInfo *gs)
{
char *p;
char *f[4];
Rectangle r;
r = Rect(0,0,0,0);
waitgs(gs);
gscmd(gs, "/CropBox knownoget {} {[0 0 0 0]} ifelse PAGE==\n");
p = Brdline(&gs->gsrd, '\n');
p[Blinelen(&gs->gsrd)-1] ='\0';
if(p[0] != '[')
return r;
if(tokenize(p+1, f, 4) != 4)
return r;
r = Rect(atoi(f[0]), atoi(f[1]), atoi(f[2]), atoi(f[3]));
waitgs(gs);
return r;
}
Document*
initpdf(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
{
Document *d;
PDFInfo *pdf;
char *p;
char *fn;
char fdbuf[20];
int fd;
int i, npage;
Rectangle bbox;
if(argc > 1) {
fprint(2, "can only view one pdf file at a time\n");
return nil;
}
fprint(2, "reading through pdf...\n");
if(b == nil){ /* standard input; spool to disk (ouch) */
fd = spooltodisk(buf, nbuf, &fn);
sprint(fdbuf, "/dev/fd/%d", fd);
b = Bopen(fdbuf, OREAD);
if(b == nil){
fprint(2, "cannot open disk spool file\n");
wexits("Bopen temp");
}
}else
fn = argv[0];
/* sanity check */
Bseek(b, 0, 0);
if(!(p = Brdline(b, '\n')) && !(p = Brdline(b, '\r'))) {
fprint(2, "cannot find end of first line\n");
wexits("initps");
}
if(strncmp(p, "%PDF-", 5) != 0) {
werrstr("not pdf");
return nil;
}
/* setup structures so one free suffices */
p = emalloc(sizeof(*d) + sizeof(*pdf));
d = (Document*) p;
p += sizeof(*d);
pdf = (PDFInfo*) p;
d->extra = pdf;
d->b = b;
d->drawpage = pdfdrawpage;
d->pagename = pdfpagename;
d->fwdonly = 0;
d->type = Tpdf;
if(spawngs(&pdf->gs, "-dDELAYSAFER") < 0)
return nil;
gscmd(&pdf->gs, "%s", pdfprolog);
waitgs(&pdf->gs);
setdim(&pdf->gs, Rect(0,0,0,0), ppi, 0);
gscmd(&pdf->gs, "(%s) (r) file { DELAYSAFER { .setsafe } if } stopped pop pdfopen begin\n", fn);
gscmd(&pdf->gs, "pdfpagecount PAGE==\n");
p = Brdline(&pdf->gs.gsrd, '\n');
if(p == nil) {
if(Blinelen(&pdf->gs.gsrd) > 0) {
fprint(2, "unexpected output (too long) from gs\n");
return nil;
}
fprint(2, "early EOF from gs - is ghostscript installed?\n");
return nil;
}
npage = atoi(p);
if(npage < 1) {
fprint(2, "no pages?\n");
return nil;
}
d->npage = npage;
d->docname = argv[0];
gscmd(&pdf->gs, "Trailer\n");
bbox = pdfbbox(&pdf->gs);
pdf->pagebbox = emalloc(sizeof(Rectangle)*npage);
for(i=0; i<npage; i++) {
gscmd(&pdf->gs, "%d pdfgetpage\n", i+1);
pdf->pagebbox[i] = pdfbbox(&pdf->gs);
if(Dx(pdf->pagebbox[i]) <= 0)
pdf->pagebbox[i] = bbox;
}
return d;
}
static Image*
pdfdrawpage(Document *doc, int page)
{
PDFInfo *pdf = doc->extra;
Image *im;
gscmd(&pdf->gs, "%d DoPDFPage\n", page+1);
im = convert(&pdf->gs.g);
if(im == nil) {
fprint(2, "fatal: readimage error %r\n");
wexits("readimage");
}
waitgs(&pdf->gs);
return im;
}
static char*
pdfpagename(Document *d, int page)
{
static char str[15];
USED(d);
sprint(str, "p %d", page+1);
return str;
}
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