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#include "fitz.h"
#include "mupdf.h"
struct info
{
fz_obj *resources;
fz_obj *mediabox;
fz_obj *cropbox;
fz_obj *rotate;
};
int
pdf_get_page_count(pdf_xref *xref)
{
return xref->page_len;
}
fz_obj *
pdf_get_page_object(pdf_xref *xref, int number)
{
if (number > 0 && number <= xref->page_len)
return xref->page_objs[number - 1];
return NULL;
}
fz_obj *
pdf_get_page_ref(pdf_xref *xref, int number)
{
if (number > 0 && number <= xref->page_len)
return xref->page_refs[number - 1];
return NULL;
}
int
pdf_find_page_object(pdf_xref *xref, fz_obj *page)
{
int num = fz_to_num(page);
int gen = fz_to_gen(page);
int i;
for (i = 0; i < xref->page_len; i++)
if (num == fz_to_num(xref->page_refs[i]) && gen == fz_to_gen(xref->page_refs[i]))
return i + 1;
return 0;
}
static void
pdf_load_page_tree_node(pdf_xref *xref, fz_obj *node, struct info info)
{
fz_obj *dict, *kids, *count;
fz_obj *obj, *tmp;
int i, n;
/* prevent infinite recursion */
if (fz_dict_gets(node, ".seen"))
return;
kids = fz_dict_gets(node, "Kids");
count = fz_dict_gets(node, "Count");
if (fz_is_array(kids) && fz_is_int(count))
{
obj = fz_dict_gets(node, "Resources");
if (obj)
info.resources = obj;
obj = fz_dict_gets(node, "MediaBox");
if (obj)
info.mediabox = obj;
obj = fz_dict_gets(node, "CropBox");
if (obj)
info.cropbox = obj;
obj = fz_dict_gets(node, "Rotate");
if (obj)
info.rotate = obj;
tmp = fz_new_null();
fz_dict_puts(node, ".seen", tmp);
fz_drop_obj(tmp);
n = fz_array_len(kids);
for (i = 0; i < n; i++)
{
obj = fz_array_get(kids, i);
pdf_load_page_tree_node(xref, obj, info);
}
fz_dict_dels(node, ".seen");
}
else
{
dict = fz_resolve_indirect(node);
if (info.resources && !fz_dict_gets(dict, "Resources"))
fz_dict_puts(dict, "Resources", info.resources);
if (info.mediabox && !fz_dict_gets(dict, "MediaBox"))
fz_dict_puts(dict, "MediaBox", info.mediabox);
if (info.cropbox && !fz_dict_gets(dict, "CropBox"))
fz_dict_puts(dict, "CropBox", info.cropbox);
if (info.rotate && !fz_dict_gets(dict, "Rotate"))
fz_dict_puts(dict, "Rotate", info.rotate);
if (xref->page_len == xref->page_cap)
{
fz_warn("found more pages than expected");
xref->page_cap ++;
xref->page_refs = fz_realloc(xref->page_refs, xref->page_cap, sizeof(fz_obj*));
xref->page_objs = fz_realloc(xref->page_objs, xref->page_cap, sizeof(fz_obj*));
}
xref->page_refs[xref->page_len] = fz_keep_obj(node);
xref->page_objs[xref->page_len] = fz_keep_obj(dict);
xref->page_len ++;
}
}
fz_error
pdf_load_page_tree(pdf_xref *xref)
{
struct info info;
fz_obj *catalog = fz_dict_gets(xref->trailer, "Root");
fz_obj *pages = fz_dict_gets(catalog, "Pages");
fz_obj *count = fz_dict_gets(pages, "Count");
if (!fz_is_dict(pages))
return fz_throw("missing page tree");
if (!fz_is_int(count))
return fz_throw("missing page count");
xref->page_cap = fz_to_int(count);
xref->page_len = 0;
xref->page_refs = fz_calloc(xref->page_cap, sizeof(fz_obj*));
xref->page_objs = fz_calloc(xref->page_cap, sizeof(fz_obj*));
info.resources = NULL;
info.mediabox = NULL;
info.cropbox = NULL;
info.rotate = NULL;
pdf_load_page_tree_node(xref, pages, info);
return fz_okay;
}
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