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pdfdoc.c
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pdfdoc.c
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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2008-2015 by Jin-Hwan Cho, Matthias Franz, and Shunsaku Hirata,
the dvipdfmx project team.
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
/*
* TODO: Many things...
* {begin,end}_{bead,article}, box stack, name tree (not limited to dests)...
*/
#include "libtexpdf.h"
#if HAVE_LIBPNG
#include "pngimage.h"
#endif
#include <time.h>
#define PDFDOC_PAGES_ALLOC_SIZE 128u
#define PDFDOC_ARTICLE_ALLOC_SIZE 16
#define PDFDOC_BEAD_ALLOC_SIZE 16
/* XXX Need to eliminate statics if this is going to be reentrant! */
static int verbose = 0;
static char *thumb_basename = NULL;
static char * my_name = "libtexpdf";
void
texpdf_doc_enable_manual_thumbnails (pdf_doc* p)
{
#if HAVE_LIBPNG
p->manual_thumb_enabled = 1;
#else
WARN("Manual thumbnail is not supported without the libpng library.");
#endif
}
static pdf_obj *
read_thumbnail (pdf_doc *p, const char *thumb_filename)
{
pdf_obj *image_ref;
int xobj_id;
FILE *fp;
fp = MFOPEN(thumb_filename, FOPEN_RBIN_MODE);
if (!fp) {
WARN("Could not open thumbnail file \"%s\"", thumb_filename);
return NULL;
}
if (!texpdf_check_for_png(fp) && !texpdf_check_for_jpeg(fp)) {
WARN("Thumbnail \"%s\" not a png/jpeg file!", thumb_filename);
MFCLOSE(fp);
return NULL;
}
MFCLOSE(fp);
xobj_id = texpdf_ximage_findresource(p, thumb_filename, 0, NULL);
if (xobj_id < 0) {
WARN("Could not read thumbnail file \"%s\".", thumb_filename);
image_ref = NULL;
} else {
image_ref = texpdf_ximage_get_reference(xobj_id);
}
return image_ref;
}
void
texpdf_doc_set_verbose (void)
{
verbose++;
pdf_font_set_verbose();
texpdf_color_set_verbose();
texpdf_ximage_set_verbose();
}
typedef struct pdf_form
{
char *ident;
pdf_tmatrix matrix;
pdf_rect cropbox;
pdf_obj *resources;
pdf_obj *contents;
} pdf_form;
struct form_list_node
{
int q_depth;
pdf_form form;
struct form_list_node *prev;
};
#define USE_MY_MEDIABOX (1 << 0)
struct name_dict
{
const char *category;
struct ht_table *data;
};
static void
pdf_doc_init_catalog (pdf_doc *p)
{
p->root.viewerpref = NULL;
p->root.pagelabels = NULL;
p->root.pages = NULL;
p->root.names = NULL;
p->root.threads = NULL;
p->root.dict = texpdf_new_dict();
texpdf_set_root(p->root.dict);
return;
}
static void
pdf_doc_close_catalog (pdf_doc *p)
{
pdf_obj *tmp;
if (p->root.viewerpref) {
tmp = texpdf_lookup_dict(p->root.dict, "ViewerPreferences");
if (!tmp) {
texpdf_add_dict(p->root.dict,
texpdf_new_name("ViewerPreferences"),
texpdf_ref_obj (p->root.viewerpref));
} else if (PDF_OBJ_DICTTYPE(tmp)) {
texpdf_merge_dict(p->root.viewerpref, tmp);
texpdf_add_dict(p->root.dict,
texpdf_new_name("ViewerPreferences"),
texpdf_ref_obj (p->root.viewerpref));
} else { /* Maybe reference */
/* What should I do? */
WARN("Could not modify ViewerPreferences.");
}
texpdf_release_obj(p->root.viewerpref);
p->root.viewerpref = NULL;
}
if (p->root.pagelabels) {
tmp = texpdf_lookup_dict(p->root.dict, "PageLabels");
if (!tmp) {
tmp = texpdf_new_dict();
texpdf_add_dict(tmp, texpdf_new_name("Nums"), texpdf_link_obj(p->root.pagelabels));
texpdf_add_dict(p->root.dict,
texpdf_new_name("PageLabels"), texpdf_ref_obj(tmp));
texpdf_release_obj(tmp);
} else { /* Maybe reference */
/* What should I do? */
WARN("Could not modify PageLabels.");
}
texpdf_release_obj(p->root.pagelabels);
p->root.pagelabels = NULL;
}
texpdf_add_dict(p->root.dict,
texpdf_new_name("Type"), texpdf_new_name("Catalog"));
texpdf_release_obj(p->root.dict);
p->root.dict = NULL;
return;
}
/*
* Pages are starting at 1.
* The page count does not increase until the page is finished.
*/
#define LASTPAGE(p) (&(p->pages.entries[p->pages.num_entries]))
#define FIRSTPAGE(p) (&(p->pages.entries[0]))
#define PAGECOUNT(p) (p->pages.num_entries)
#define MAXPAGES(p) (p->pages.max_entries)
static void
doc_resize_page_entries (pdf_doc *p, long size)
{
if (size > MAXPAGES(p)) {
long i;
p->pages.entries = RENEW(p->pages.entries, size, struct pdf_page);
for (i = p->pages.max_entries; i < size; i++) {
p->pages.entries[i].page_obj = NULL;
p->pages.entries[i].page_ref = NULL;
p->pages.entries[i].flags = 0;
p->pages.entries[i].resources = NULL;
p->pages.entries[i].background = NULL;
p->pages.entries[i].contents = NULL;
p->pages.entries[i].content_refs[0] = NULL; /* global bop */
p->pages.entries[i].content_refs[1] = NULL; /* background */
p->pages.entries[i].content_refs[2] = NULL; /* page body */
p->pages.entries[i].content_refs[3] = NULL; /* global eop */
p->pages.entries[i].annots = NULL;
p->pages.entries[i].beads = NULL;
}
p->pages.max_entries = size;
}
return;
}
static pdf_page *
doc_get_page_entry (pdf_doc *p, unsigned long page_no)
{
pdf_page *page;
if (page_no > 65535ul) {
ERROR("Page number %ul too large!", page_no);
} else if (page_no == 0) {
ERROR("Invalid Page number %ul.", page_no);
}
if (page_no > MAXPAGES(p)) {
doc_resize_page_entries(p, page_no + PDFDOC_PAGES_ALLOC_SIZE);
}
page = &(p->pages.entries[page_no - 1]);
return page;
}
static void pdf_doc_init_page_tree (pdf_doc *p, double media_width, double media_height);
static void pdf_doc_close_page_tree (pdf_doc *p);
static void pdf_doc_init_names (pdf_doc *p, int check_gotos);
static void pdf_doc_close_names (pdf_doc *p);
static void pdf_doc_add_goto (pdf_doc *p, pdf_obj *annot_dict);
static void pdf_doc_init_docinfo (pdf_doc *p);
static void pdf_doc_close_docinfo (pdf_doc *p);
static void pdf_doc_init_articles (pdf_doc *p);
static void pdf_doc_close_articles (pdf_doc *p);
static void pdf_doc_init_bookmarks (pdf_doc *p, int bm_open_depth);
static void pdf_doc_close_bookmarks (pdf_doc *p);
void
texpdf_doc_set_bop_content (pdf_doc *p, const char *content, unsigned length)
{
ASSERT(p);
if (p->pages.bop) {
texpdf_release_obj(p->pages.bop);
p->pages.bop = NULL;
}
if (length > 0) {
p->pages.bop = texpdf_new_stream(STREAM_COMPRESS);
texpdf_add_stream(p->pages.bop, content, length);
} else {
p->pages.bop = NULL;
}
return;
}
void
texpdf_doc_set_eop_content (pdf_doc *p, const char *content, unsigned length)
{
if (p->pages.eop) {
texpdf_release_obj(p->pages.eop);
p->pages.eop = NULL;
}
if (length > 0) {
p->pages.eop = texpdf_new_stream(STREAM_COMPRESS);
texpdf_add_stream(p->pages.eop, content, length);
} else {
p->pages.eop = NULL;
}
return;
}
#ifndef HAVE_TM_GMTOFF
#ifndef HAVE_TIMEZONE
/* auxiliary function to compute timezone offset on
systems that do not support the tm_gmtoff in struct tm,
or have a timezone variable. Such as i386-solaris. */
static long
compute_timezone_offset()
{
const time_t now = time(NULL);
struct tm tm;
struct tm local;
time_t gmtoff;
localtime_r(&now, &local);
gmtime_r(&now, &tm);
return (mktime(&local) - mktime(&tm));
}
#endif /* HAVE_TIMEZONE */
#endif /* HAVE_TM_GMTOFF */
/*
* Docinfo
*/
static long
asn_date (char *date_string)
{
long tz_offset;
time_t current_time;
struct tm *bd_time;
time(¤t_time);
bd_time = localtime(¤t_time);
#ifdef HAVE_TM_GMTOFF
tz_offset = bd_time->tm_gmtoff;
#else
# ifdef HAVE_TIMEZONE
tz_offset = -timezone;
# else
tz_offset = compute_timezone_offset();
# endif /* HAVE_TIMEZONE */
#endif /* HAVE_TM_GMTOFF */
sprintf(date_string, "D:%04d%02d%02d%02d%02d%02d%c%02ld'%02ld'",
bd_time->tm_year + 1900, bd_time->tm_mon + 1, bd_time->tm_mday,
bd_time->tm_hour, bd_time->tm_min, bd_time->tm_sec,
(tz_offset > 0) ? '+' : '-', labs(tz_offset) / 3600,
(labs(tz_offset) / 60) % 60);
return strlen(date_string);
}
static void
pdf_doc_init_docinfo (pdf_doc *p)
{
p->info = texpdf_new_dict();
texpdf_set_info(p->info);
return;
}
static void
pdf_doc_close_docinfo (pdf_doc *p)
{
pdf_obj *docinfo = p->info;
/*
* Excerpt from PDF Reference 4th ed., sec. 10.2.1.
*
* Any entry whose value is not known should be omitted from the dictionary,
* rather than included with an empty string as its value.
*
* ....
*
* Note: Although viewer applications can store custom metadata in the document
* information dictionary, it is inappropriate to store private content or
* structural information there; such information should be stored in the
* document catalog instead (see Section 3.6.1, Document Catalog ).
*/
const char *keys[] = {
"Title", "Author", "Subject", "Keywords", "Creator", "Producer",
"CreationDate", "ModDate", /* Date */
NULL
};
pdf_obj *value;
int i;
for (i = 0; keys[i] != NULL; i++) {
value = texpdf_lookup_dict(docinfo, keys[i]);
if (value) {
if (!PDF_OBJ_STRINGTYPE(value)) {
WARN("\"%s\" in DocInfo dictionary not string type.", keys[i]);
texpdf_remove_dict(docinfo, keys[i]);
WARN("\"%s\" removed from DocInfo.", keys[i]);
} else if (texpdf_string_length(value) == 0) {
/* The hyperref package often uses emtpy strings. */
texpdf_remove_dict(docinfo, keys[i]);
}
}
}
if (!texpdf_lookup_dict(docinfo, "Producer")) {
char *banner;
banner = NEW(strlen(my_name)+strlen(PACKAGE_VERSION)+4, char);
sprintf(banner, "%s (%s)", my_name, PACKAGE_VERSION);
texpdf_add_dict(docinfo,
texpdf_new_name("Producer"),
texpdf_new_string(banner, strlen(banner)));
RELEASE(banner);
}
if (!texpdf_lookup_dict(docinfo, "CreationDate")) {
char now[32];
asn_date(now);
texpdf_add_dict(docinfo,
texpdf_new_name ("CreationDate"),
texpdf_new_string(now, strlen(now)));
}
texpdf_release_obj(docinfo);
p->info = NULL;
return;
}
static pdf_obj *
texpdf_doc_get_page_resources (pdf_doc *p, const char *category)
{
pdf_obj *resources;
pdf_page *currentpage;
pdf_obj *res_dict;
if (!p || !category) {
return NULL;
}
if (p->pending_forms) {
if (p->pending_forms->form.resources) {
res_dict = p->pending_forms->form.resources;
} else {
res_dict = p->pending_forms->form.resources = texpdf_new_dict();
}
} else {
currentpage = LASTPAGE(p);
if (currentpage->resources) {
res_dict = currentpage->resources;
} else {
res_dict = currentpage->resources = texpdf_new_dict();
}
}
resources = texpdf_lookup_dict(res_dict, category);
if (!resources) {
resources = texpdf_new_dict();
texpdf_add_dict(res_dict, texpdf_new_name(category), resources);
}
return resources;
}
void
texpdf_doc_add_page_resource (pdf_doc *p, const char *category,
const char *resource_name, pdf_obj *resource_ref)
{
pdf_obj *resources;
pdf_obj *duplicate;
if (!PDF_OBJ_INDIRECTTYPE(resource_ref)) {
WARN("Passed non indirect reference...");
resource_ref = texpdf_ref_obj(resource_ref); /* leak */
}
resources = texpdf_doc_get_page_resources(p, category);
duplicate = texpdf_lookup_dict(resources, resource_name);
if (duplicate && pdf_compare_reference(duplicate, resource_ref)) {
WARN("Conflicting page resource found (page: %ld, category: %s, name: %s).",
texpdf_doc_current_page_number(p), category, resource_name);
WARN("Ignoring...");
texpdf_release_obj(resource_ref);
} else {
texpdf_add_dict(resources, texpdf_new_name(resource_name), resource_ref);
}
return;
}
static void
doc_flush_page (pdf_doc *p, pdf_page *page, pdf_obj *parent_ref)
{
pdf_obj *contents_array;
int count;
texpdf_add_dict(page->page_obj,
texpdf_new_name("Type"), texpdf_new_name("Page"));
texpdf_add_dict(page->page_obj,
texpdf_new_name("Parent"), parent_ref);
/*
* Clipping area specified by CropBox is affected by MediaBox which
* might be inherit from parent node. If MediaBox of the root node
* does not have enough size to cover all page's imaging area, using
* CropBox here gives incorrect result.
*/
if (page->flags & USE_MY_MEDIABOX) {
pdf_obj *mediabox;
mediabox = texpdf_new_array();
texpdf_add_array(mediabox,
texpdf_new_number(ROUND(page->cropbox.llx, 0.01)));
texpdf_add_array(mediabox,
texpdf_new_number(ROUND(page->cropbox.lly, 0.01)));
texpdf_add_array(mediabox,
texpdf_new_number(ROUND(page->cropbox.urx, 0.01)));
texpdf_add_array(mediabox,
texpdf_new_number(ROUND(page->cropbox.ury, 0.01)));
texpdf_add_dict(page->page_obj, texpdf_new_name("MediaBox"), mediabox);
}
count = 0;
contents_array = texpdf_new_array();
if (page->content_refs[0]) { /* global bop */
texpdf_add_array(contents_array, page->content_refs[0]);
count++;
} else if (p->pages.bop &&
pdf_stream_length(p->pages.bop) > 0) {
texpdf_add_array(contents_array, texpdf_ref_obj(p->pages.bop));
count++;
}
if (page->content_refs[1]) { /* background */
texpdf_add_array(contents_array, page->content_refs[1]);
count++;
}
if (page->content_refs[2]) { /* page body */
texpdf_add_array(contents_array, page->content_refs[2]);
count++;
}
if (page->content_refs[3]) { /* global eop */
texpdf_add_array(contents_array, page->content_refs[3]);
count++;
} else if (p->pages.eop &&
pdf_stream_length(p->pages.eop) > 0) {
texpdf_add_array(contents_array, texpdf_ref_obj(p->pages.eop));
count++;
}
if (count == 0) {
WARN("Page with empty content found!!!");
}
page->content_refs[0] = NULL;
page->content_refs[1] = NULL;
page->content_refs[2] = NULL;
page->content_refs[3] = NULL;
texpdf_add_dict(page->page_obj,
texpdf_new_name("Contents"), contents_array);
if (page->annots) {
texpdf_add_dict(page->page_obj,
texpdf_new_name("Annots"), texpdf_ref_obj(page->annots));
texpdf_release_obj(page->annots);
}
if (page->beads) {
texpdf_add_dict(page->page_obj,
texpdf_new_name("B"), texpdf_ref_obj(page->beads));
texpdf_release_obj(page->beads);
}
texpdf_release_obj(page->page_obj);
texpdf_release_obj(page->page_ref);
page->page_obj = NULL;
page->page_ref = NULL;
page->annots = NULL;
page->beads = NULL;
return;
}
/* B-tree? */
#define PAGE_CLUSTER 4
static pdf_obj *
build_page_tree (pdf_doc *p,
pdf_page *firstpage, long num_pages,
pdf_obj *parent_ref)
{
pdf_obj *self, *self_ref, *kids;
long i;
self = texpdf_new_dict();
/*
* This is a slight kludge which allow the subtree dictionary
* generated by this routine to be merged with the real
* page_tree dictionary, while keeping the indirect object
* references right.
*/
self_ref = parent_ref ? texpdf_ref_obj(self) : texpdf_ref_obj(p->root.pages);
texpdf_add_dict(self, texpdf_new_name("Type"), texpdf_new_name("Pages"));
texpdf_add_dict(self, texpdf_new_name("Count"), texpdf_new_number((double) num_pages));
if (parent_ref != NULL)
texpdf_add_dict(self, texpdf_new_name("Parent"), parent_ref);
kids = texpdf_new_array();
if (num_pages > 0 && num_pages <= PAGE_CLUSTER) {
for (i = 0; i < num_pages; i++) {
pdf_page *page;
page = firstpage + i;
if (!page->page_ref)
page->page_ref = texpdf_ref_obj(page->page_obj);
texpdf_add_array (kids, texpdf_link_obj(page->page_ref));
doc_flush_page(p, page, texpdf_link_obj(self_ref));
}
} else if (num_pages > 0) {
for (i = 0; i < PAGE_CLUSTER; i++) {
long start, end;
start = (i*num_pages)/PAGE_CLUSTER;
end = ((i+1)*num_pages)/PAGE_CLUSTER;
if (end - start > 1) {
pdf_obj *subtree;
subtree = build_page_tree(p, firstpage + start, end - start,
texpdf_link_obj(self_ref));
texpdf_add_array(kids, texpdf_ref_obj(subtree));
texpdf_release_obj(subtree);
} else {
pdf_page *page;
page = firstpage + start;
if (!page->page_ref)
page->page_ref = texpdf_ref_obj(page->page_obj);
texpdf_add_array (kids, texpdf_link_obj(page->page_ref));
doc_flush_page(p, page, texpdf_link_obj(self_ref));
}
}
}
texpdf_add_dict(self, texpdf_new_name("Kids"), kids);
texpdf_release_obj(self_ref);
return self;
}
static void
pdf_doc_init_page_tree (pdf_doc *p, double media_width, double media_height)
{
/*
* Create empty page tree.
* The docroot.pages is kept open until the document is closed.
* This allows the user to write to pages if he so choses.
*/
p->root.pages = texpdf_new_dict();
p->pages.num_entries = 0;
p->pages.max_entries = 0;
p->pages.entries = NULL;
p->pages.bop = NULL;
p->pages.eop = NULL;
p->pages.mediabox.llx = 0.0;
p->pages.mediabox.lly = 0.0;
p->pages.mediabox.urx = media_width;
p->pages.mediabox.ury = media_height;
return;
}
static void
pdf_doc_close_page_tree (pdf_doc *p)
{
pdf_obj *page_tree_root;
pdf_obj *mediabox;
long page_no;
/*
* Do consistency check on forward references to pages.
*/
for (page_no = PAGECOUNT(p) + 1; page_no <= MAXPAGES(p); page_no++) {
pdf_page *page;
page = doc_get_page_entry(p, page_no);
if (page->page_obj) {
WARN("Nonexistent page #%ld refered.", page_no);
texpdf_release_obj(page->page_ref);
page->page_ref = NULL;
}
if (page->page_obj) {
WARN("Entry for a nonexistent page #%ld created.", page_no);
texpdf_release_obj(page->page_obj);
page->page_obj = NULL;
}
if (page->annots) {
WARN("Annotation attached to a nonexistent page #%ld.", page_no);
texpdf_release_obj(page->annots);
page->annots = NULL;
}
if (page->beads) {
WARN("Article beads attached to a nonexistent page #%ld.", page_no);
texpdf_release_obj(page->beads);
page->beads = NULL;
}
if (page->resources) {
texpdf_release_obj(page->resources);
page->resources = NULL;
}
}
/*
* Connect page tree to root node.
*/
page_tree_root = build_page_tree(p, FIRSTPAGE(p), PAGECOUNT(p), NULL);
texpdf_merge_dict (p->root.pages, page_tree_root);
texpdf_release_obj(page_tree_root);
/* They must be after build_page_tree() */
if (p->pages.bop) {
texpdf_add_stream (p->pages.bop, "\n", 1);
texpdf_release_obj(p->pages.bop);
p->pages.bop = NULL;
}
if (p->pages.eop) {
texpdf_add_stream (p->pages.eop, "\n", 1);
texpdf_release_obj(p->pages.eop);
p->pages.eop = NULL;
}
/* Create media box at root node and let the other pages inherit it. */
mediabox = texpdf_new_array();
texpdf_add_array(mediabox, texpdf_new_number(ROUND(p->pages.mediabox.llx, 0.01)));
texpdf_add_array(mediabox, texpdf_new_number(ROUND(p->pages.mediabox.lly, 0.01)));
texpdf_add_array(mediabox, texpdf_new_number(ROUND(p->pages.mediabox.urx, 0.01)));
texpdf_add_array(mediabox, texpdf_new_number(ROUND(p->pages.mediabox.ury, 0.01)));
texpdf_add_dict(p->root.pages, texpdf_new_name("MediaBox"), mediabox);
texpdf_add_dict(p->root.dict,
texpdf_new_name("Pages"),
texpdf_ref_obj (p->root.pages));
texpdf_release_obj(p->root.pages);
p->root.pages = NULL;
RELEASE(p->pages.entries);
p->pages.entries = NULL;
p->pages.num_entries = 0;
p->pages.max_entries = 0;
return;
}
/*
* From PDFReference15_v6.pdf (p.119 and p.834)
*
* MediaBox rectangle (Required; inheritable)
*
* The media box defines the boundaries of the physical medium on which the
* page is to be printed. It may include any extended area surrounding the
* finished page for bleed, printing marks, or other such purposes. It may
* also include areas close to the edges of the medium that cannot be marked
* because of physical limitations of the output device. Content falling
* outside this boundary can safely be discarded without affecting the
* meaning of the PDF file.
*
* CropBox rectangle (Optional; inheritable)
*
* The crop box defines the region to which the contents of the page are to be
* clipped (cropped) when displayed or printed. Unlike the other boxes, the
* crop box has no defined meaning in terms of physical page geometry or
* intended use; it merely imposes clipping on the page contents. However,
* in the absence of additional information (such as imposition instructions
* specified in a JDF or PJTF job ticket), the crop box will determine how
* the page's contents are to be positioned on the output medium. The default
* value is the page's media box.
*
* BleedBox rectangle (Optional; PDF 1.3)
*
* The bleed box (PDF 1.3) defines the region to which the contents of the
* page should be clipped when output in a production environment. This may
* include any extra "bleed area" needed to accommodate the physical
* limitations of cutting, folding, and trimming equipment. The actual printed
* page may include printing marks that fall outside the bleed box.
* The default value is the page's crop box.
*
* TrimBox rectangle (Optional; PDF 1.3)
*
* The trim box (PDF 1.3) defines the intended dimensions of the finished page
* after trimming. It may be smaller than the media box, to allow for
* production-related content such as printing instructions, cut marks, or
* color bars. The default value is the page's crop box.
*
* ArtBox rectangle (Optional; PDF 1.3)
*
* The art box (PDF 1.3) defines the extent of the page's meaningful content
* (including potential white space) as intended by the page's creator.
* The default value is the page's crop box.
*
* Rotate integer (Optional; inheritable)
*
* The number of degrees by which the page should be rotated clockwise when
* displayed or printed. The value must be a multiple of 90. Default value: 0.
*/
pdf_obj *
texpdf_doc_get_page (pdf_file *pf, long page_no, long *count_p,
pdf_rect *bbox, pdf_obj **resources_p) {
pdf_obj *page_tree = NULL;
pdf_obj *resources = NULL, *box = NULL, *rotate = NULL;
pdf_obj *catalog;
catalog = pdf_file_get_catalog(pf);
page_tree = pdf_deref_obj(texpdf_lookup_dict(catalog, "Pages"));
if (!PDF_OBJ_DICTTYPE(page_tree))
goto error;
{
long count;
pdf_obj *tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "Count"));
if (!PDF_OBJ_NUMBERTYPE(tmp)) {
if (tmp)
texpdf_release_obj(tmp);
goto error;
}
count = texpdf_number_value(tmp);
texpdf_release_obj(tmp);
if (count_p)
*count_p = count;
if (page_no <= 0 || page_no > count) {
WARN("Page %ld does not exist.", page_no);
goto error_silent;
}
}
/*
* Seek correct page. Get MediaBox, CropBox and Resources.
* (Note that these entries can be inherited.)
*/
{
pdf_obj *media_box = NULL, *crop_box = NULL, *kids, *tmp;
int depth = PDF_OBJ_MAX_DEPTH;
long page_idx = page_no-1, kids_length = 1, i = 0;
while (--depth && i != kids_length) {
if ((tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "MediaBox")))) {
if (media_box)
texpdf_release_obj(media_box);
media_box = tmp;
}
if ((tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "CropBox")))) {
if (crop_box)
texpdf_release_obj(crop_box);
crop_box = tmp;
}
if ((tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "Rotate")))) {
if (rotate)
texpdf_release_obj(rotate);
rotate = tmp;
}
if ((tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "Resources")))) {
if (resources)
texpdf_release_obj(resources);
resources = tmp;
}
kids = pdf_deref_obj(texpdf_lookup_dict(page_tree, "Kids"));
if (!kids)
break;
else if (!PDF_OBJ_ARRAYTYPE(kids)) {
texpdf_release_obj(kids);
goto error;
}
kids_length = texpdf_array_length(kids);
for (i = 0; i < kids_length; i++) {
long count;
texpdf_release_obj(page_tree);
page_tree = pdf_deref_obj(texpdf_get_array(kids, i));
if (!PDF_OBJ_DICTTYPE(page_tree))
goto error;
tmp = pdf_deref_obj(texpdf_lookup_dict(page_tree, "Count"));
if (PDF_OBJ_NUMBERTYPE(tmp)) {
/* Pages object */
count = texpdf_number_value(tmp);
texpdf_release_obj(tmp);
} else if (!tmp)
/* Page object */
count = 1;
else {
texpdf_release_obj(tmp);
goto error;
}
if (page_idx < count)
break;
page_idx -= count;
}
texpdf_release_obj(kids);
}
if (!depth || kids_length == i) {
if (media_box)
texpdf_release_obj(media_box);
if (crop_box)
texpdf_release_obj(crop_box);
goto error;
}
if (crop_box)
box = crop_box;
else
if (!(box = pdf_deref_obj(texpdf_lookup_dict(page_tree, "ArtBox"))) &&
!(box = pdf_deref_obj(texpdf_lookup_dict(page_tree, "TrimBox"))) &&
!(box = pdf_deref_obj(texpdf_lookup_dict(page_tree, "BleedBox"))) &&
media_box) {
box = media_box;
media_box = NULL;
}
if (media_box)
texpdf_release_obj(media_box);
}
if (!PDF_OBJ_ARRAYTYPE(box) || texpdf_array_length(box) != 4 ||
!PDF_OBJ_DICTTYPE(resources))
goto error;
if (PDF_OBJ_NUMBERTYPE(rotate)) {
if (texpdf_number_value(rotate))
WARN("<< /Rotate %d >> found. (Not supported yet)",
(int) texpdf_number_value(rotate));
texpdf_release_obj(rotate);
rotate = NULL;
} else if (rotate)
goto error;
{
int i;
for (i = 4; i--; ) {
double x;
pdf_obj *tmp = pdf_deref_obj(texpdf_get_array(box, i));
if (!PDF_OBJ_NUMBERTYPE(tmp)) {
texpdf_release_obj(tmp);
goto error;
}
x = texpdf_number_value(tmp);
switch (i) {
case 0: bbox->llx = x; break;
case 1: bbox->lly = x; break;
case 2: bbox->urx = x; break;
case 3: bbox->ury = x; break;
}
texpdf_release_obj(tmp);
}
}
texpdf_release_obj(box);
if (resources_p)
*resources_p = resources;
else if (resources)
texpdf_release_obj(resources);
return page_tree;
error:
WARN("Cannot parse document. Broken PDF file?");
error_silent:
if (box)
texpdf_release_obj(box);
if (rotate)
texpdf_release_obj(rotate);
if (resources)
texpdf_release_obj(resources);
if (page_tree)
texpdf_release_obj(page_tree);
return NULL;
}
#ifndef BOOKMARKS_OPEN_DEFAULT
#define BOOKMARKS_OPEN_DEFAULT 0
#endif
static int clean_bookmarks (pdf_olitem *item);
static int flush_bookmarks (pdf_olitem *item,
pdf_obj *parent_ref,
pdf_obj *parent_dict);
static void
pdf_doc_init_bookmarks (pdf_doc *p, int bm_open_depth)
{
pdf_olitem *item;
#define MAX_OUTLINE_DEPTH 256u
p->opt.outline_open_depth =