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/*
* PDF cleaning tool: general purpose pdf syntax washer.
*
* Rewrite PDF with pretty printed objects.
* Garbage collect unreachable objects.
* Inflate compressed streams.
* Create subset documents.
*
* TODO: linearize document for fast web view
*/
#include "mupdf/pdf.h"
static int x_factor = 0;
static int y_factor = 0;
static void usage(void)
{
fprintf(stderr,
"usage: mutool poster [options] input.pdf [output.pdf]\n"
"\t-p -\tpassword\n"
"\t-x\tx decimation factor\n"
"\t-y\ty decimation factor\n");
exit(1);
}
/*
* Recreate page tree to only retain specified pages.
*/
static void decimatepages(pdf_document *doc)
{
pdf_obj *oldroot, *root, *pages, *kids, *parent;
fz_context *ctx = doc->ctx;
int num_pages = pdf_count_pages(doc);
int page, kidcount;
/* Keep only pages/type and (reduced) dest entries to avoid
* references to unretained pages */
oldroot = pdf_dict_gets(pdf_trailer(doc), "Root");
pages = pdf_dict_gets(oldroot, "Pages");
root = pdf_new_dict(doc, 2);
pdf_dict_puts(root, "Type", pdf_dict_gets(oldroot, "Type"));
pdf_dict_puts(root, "Pages", pdf_dict_gets(oldroot, "Pages"));
pdf_update_object(doc, pdf_to_num(oldroot), root);
pdf_drop_obj(root);
/* Create a new kids array with only the pages we want to keep */
parent = pdf_new_indirect(doc, pdf_to_num(pages), pdf_to_gen(pages));
kids = pdf_new_array(doc, 1);
kidcount = 0;
for (page=0; page < num_pages; page++)
{
pdf_page *page_details = pdf_load_page(doc, page);
int xf = x_factor, yf = y_factor;
int x, y;
float w = page_details->mediabox.x1 - page_details->mediabox.x0;
float h = page_details->mediabox.y1 - page_details->mediabox.y0;
if (xf == 0 && yf == 0)
{
/* Nothing specified, so split along the long edge */
if (w > h)
xf = 2, yf = 1;
else
xf = 1, yf = 2;
}
else if (xf == 0)
xf = 1;
else if (yf == 0)
yf = 1;
for (y = yf-1; y >= 0; y--)
{
for (x = 0; x < xf; x++)
{
pdf_obj *newpageobj, *newpageref, *newmediabox;
fz_rect mb;
int num;
newpageobj = pdf_copy_dict(doc->page_objs[page]);
num = pdf_create_object(doc);
pdf_update_object(doc, num, newpageobj);
newpageref = pdf_new_indirect(doc, num, 0);
newmediabox = pdf_new_array(doc, 4);
mb.x0 = page_details->mediabox.x0 + (w/xf)*x;
if (x == xf-1)
mb.x1 = page_details->mediabox.x1;
else
mb.x1 = page_details->mediabox.x0 + (w/xf)*(x+1);
mb.y0 = page_details->mediabox.y0 + (h/yf)*y;
if (y == yf-1)
mb.y1 = page_details->mediabox.y1;
else
mb.y1 = page_details->mediabox.y0 + (h/yf)*(y+1);
pdf_array_push(newmediabox, pdf_new_real(doc, mb.x0));
pdf_array_push(newmediabox, pdf_new_real(doc, mb.y0));
pdf_array_push(newmediabox, pdf_new_real(doc, mb.x1));
pdf_array_push(newmediabox, pdf_new_real(doc, mb.y1));
pdf_dict_puts(newpageobj, "Parent", parent);
pdf_dict_puts(newpageobj, "MediaBox", newmediabox);
/* Store page object in new kids array */
pdf_array_push(kids, newpageref);
kidcount++;
}
}
}
pdf_drop_obj(parent);
/* Update page count and kids array */
pdf_dict_puts(pages, "Count", pdf_new_int(doc, kidcount));
pdf_dict_puts(pages, "Kids", kids);
pdf_drop_obj(kids);
}
int pdfposter_main(int argc, char **argv)
{
char *infile;
char *outfile = "out.pdf";
char *password = "";
int c;
fz_write_options opts;
pdf_document *doc;
fz_context *ctx;
opts.do_garbage = 0;
opts.do_expand = 0;
opts.do_ascii = 0;
while ((c = fz_getopt(argc, argv, "x:y:")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'x': x_factor = atoi(fz_optarg); break;
case 'y': y_factor = atoi(fz_optarg); break;
default: usage(); break;
}
}
if (argc - fz_optind < 1)
usage();
infile = argv[fz_optind++];
if (argc - fz_optind > 0 &&
(strstr(argv[fz_optind], ".pdf") || strstr(argv[fz_optind], ".PDF")))
{
outfile = argv[fz_optind++];
}
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
doc = pdf_open_document_no_run(ctx, infile);
if (pdf_needs_password(doc))
if (!pdf_authenticate_password(doc, password))
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot authenticate password: %s", infile);
/* Only retain the specified subset of the pages */
decimatepages(doc);
pdf_write_document(doc, outfile, &opts);
pdf_close_document(doc);
fz_free_context(ctx);
return 0;
}
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