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#include "mupdf/pdf.h"
static pdf_obj *
resolve_dest_rec(pdf_document *doc, pdf_obj *dest, fz_link_kind kind, int depth)
{
if (depth > 10) /* Arbitrary to avoid infinite recursion */
return NULL;
if (pdf_is_name(dest) || pdf_is_string(dest))
{
if (kind == FZ_LINK_GOTO)
{
dest = pdf_lookup_dest(doc, dest);
dest = resolve_dest_rec(doc, dest, kind, depth+1);
}
return dest;
}
else if (pdf_is_array(dest))
{
return dest;
}
else if (pdf_is_dict(dest))
{
dest = pdf_dict_gets(dest, "D");
return resolve_dest_rec(doc, dest, kind, depth+1);
}
else if (pdf_is_indirect(dest))
return dest;
return NULL;
}
static pdf_obj *
resolve_dest(pdf_document *doc, pdf_obj *dest, fz_link_kind kind)
{
return resolve_dest_rec(doc, dest, kind, 0);
}
fz_link_dest
pdf_parse_link_dest(pdf_document *doc, fz_link_kind kind, pdf_obj *dest)
{
fz_link_dest ld;
pdf_obj *obj;
int l_from_2 = 0;
int b_from_3 = 0;
int r_from_4 = 0;
int t_from_5 = 0;
int t_from_3 = 0;
int t_from_2 = 0;
int z_from_4 = 0;
ld.kind = kind;
ld.ld.gotor.flags = 0;
ld.ld.gotor.lt.x = 0;
ld.ld.gotor.lt.y = 0;
ld.ld.gotor.rb.x = 0;
ld.ld.gotor.rb.y = 0;
ld.ld.gotor.page = -1;
ld.ld.gotor.dest = NULL;
dest = resolve_dest(doc, dest, kind);
if (dest == NULL)
{
fz_warn(doc->ctx, "undefined link destination");
return ld;
}
if (pdf_is_name(dest))
{
ld.ld.gotor.dest = pdf_to_name(dest);
return ld;
}
else if (pdf_is_string(dest))
{
ld.ld.gotor.dest = pdf_to_str_buf(dest);
return ld;
}
obj = pdf_array_get(dest, 0);
if (pdf_is_int(obj))
ld.ld.gotor.page = pdf_to_int(obj);
else
{
fz_try(doc->ctx)
{
ld.ld.gotor.page = pdf_lookup_page_number(doc, obj);
}
fz_catch(doc->ctx)
{
ld.kind = FZ_LINK_NONE;
return ld;
}
}
obj = pdf_array_get(dest, 1);
if (!pdf_is_name(obj))
return ld;
if (!strcmp("XYZ", pdf_to_name(obj)))
{
l_from_2 = t_from_3 = z_from_4 = 1;
ld.ld.gotor.flags |= fz_link_flag_r_is_zoom;
}
else if ((!strcmp("Fit", pdf_to_name(obj))) || (!strcmp("FitB", pdf_to_name(obj))))
{
ld.ld.gotor.flags |= fz_link_flag_fit_h;
ld.ld.gotor.flags |= fz_link_flag_fit_v;
}
else if ((!strcmp("FitH", pdf_to_name(obj))) || (!strcmp("FitBH", pdf_to_name(obj))))
{
t_from_2 = 1;
ld.ld.gotor.flags |= fz_link_flag_fit_h;
}
else if ((!strcmp("FitV", pdf_to_name(obj))) || (!strcmp("FitBV", pdf_to_name(obj))))
{
l_from_2 = 1;
ld.ld.gotor.flags |= fz_link_flag_fit_v;
}
else if (!strcmp("FitR", pdf_to_name(obj)))
{
l_from_2 = b_from_3 = r_from_4 = t_from_5 = 1;
ld.ld.gotor.flags |= fz_link_flag_fit_h;
ld.ld.gotor.flags |= fz_link_flag_fit_v;
}
if (l_from_2)
{
obj = pdf_array_get(dest, 2);
if (pdf_is_int(obj))
{
ld.ld.gotor.flags |= fz_link_flag_l_valid;
ld.ld.gotor.lt.x = pdf_to_int(obj);
}
else if (pdf_is_real(obj))
{
ld.ld.gotor.flags |= fz_link_flag_l_valid;
ld.ld.gotor.lt.x = pdf_to_real(obj);
}
}
if (b_from_3)
{
obj = pdf_array_get(dest, 3);
if (pdf_is_int(obj))
{
ld.ld.gotor.flags |= fz_link_flag_b_valid;
ld.ld.gotor.rb.y = pdf_to_int(obj);
}
else if (pdf_is_real(obj))
{
ld.ld.gotor.flags |= fz_link_flag_b_valid;
ld.ld.gotor.rb.y = pdf_to_real(obj);
}
}
if (r_from_4)
{
obj = pdf_array_get(dest, 4);
if (pdf_is_int(obj))
{
ld.ld.gotor.flags |= fz_link_flag_r_valid;
ld.ld.gotor.rb.x = pdf_to_int(obj);
}
else if (pdf_is_real(obj))
{
ld.ld.gotor.flags |= fz_link_flag_r_valid;
ld.ld.gotor.rb.x = pdf_to_real(obj);
}
}
if (t_from_5 || t_from_3 || t_from_2)
{
if (t_from_5)
obj = pdf_array_get(dest, 5);
else if (t_from_3)
obj = pdf_array_get(dest, 3);
else
obj = pdf_array_get(dest, 2);
if (pdf_is_int(obj))
{
ld.ld.gotor.flags |= fz_link_flag_t_valid;
ld.ld.gotor.lt.y = pdf_to_int(obj);
}
else if (pdf_is_real(obj))
{
ld.ld.gotor.flags |= fz_link_flag_t_valid;
ld.ld.gotor.lt.y = pdf_to_real(obj);
}
}
if (z_from_4)
{
obj = pdf_array_get(dest, 4);
if (pdf_is_int(obj))
{
ld.ld.gotor.flags |= fz_link_flag_r_valid;
ld.ld.gotor.rb.x = pdf_to_int(obj);
}
else if (pdf_is_real(obj))
{
ld.ld.gotor.flags |= fz_link_flag_r_valid;
ld.ld.gotor.rb.x = pdf_to_real(obj);
}
}
/* Duplicate the values out for the sake of stupid clients */
if ((ld.ld.gotor.flags & (fz_link_flag_l_valid | fz_link_flag_r_valid)) == fz_link_flag_l_valid)
ld.ld.gotor.rb.x = ld.ld.gotor.lt.x;
if ((ld.ld.gotor.flags & (fz_link_flag_l_valid | fz_link_flag_r_valid | fz_link_flag_r_is_zoom)) == fz_link_flag_r_valid)
ld.ld.gotor.lt.x = ld.ld.gotor.rb.x;
if ((ld.ld.gotor.flags & (fz_link_flag_t_valid | fz_link_flag_b_valid)) == fz_link_flag_t_valid)
ld.ld.gotor.rb.y = ld.ld.gotor.lt.y;
if ((ld.ld.gotor.flags & (fz_link_flag_t_valid | fz_link_flag_b_valid)) == fz_link_flag_b_valid)
ld.ld.gotor.lt.y = ld.ld.gotor.rb.y;
return ld;
}
static char *
pdf_parse_file_spec(pdf_document *doc, pdf_obj *file_spec)
{
fz_context *ctx = doc->ctx;
pdf_obj *filename;
if (pdf_is_string(file_spec))
return pdf_to_utf8(doc, file_spec);
if (pdf_is_dict(file_spec)) {
filename = pdf_dict_gets(file_spec, "UF");
if (!filename)
filename = pdf_dict_gets(file_spec, "F");
if (!filename)
filename = pdf_dict_gets(file_spec, "Unix");
if (!filename)
filename = pdf_dict_gets(file_spec, "Mac");
if (!filename)
filename = pdf_dict_gets(file_spec, "DOS");
return pdf_to_utf8(doc, filename);
}
fz_warn(ctx, "cannot parse file specification");
return NULL;
}
fz_link_dest
pdf_parse_action(pdf_document *doc, pdf_obj *action)
{
fz_link_dest ld;
pdf_obj *obj, *dest, *file_spec;
fz_context *ctx = doc->ctx;
UNUSED(ctx);
ld.kind = FZ_LINK_NONE;
if (!action)
return ld;
obj = pdf_dict_gets(action, "S");
if (!strcmp(pdf_to_name(obj), "GoTo"))
{
dest = pdf_dict_gets(action, "D");
ld = pdf_parse_link_dest(doc, FZ_LINK_GOTO, dest);
}
else if (!strcmp(pdf_to_name(obj), "URI"))
{
ld.kind = FZ_LINK_URI;
ld.ld.uri.is_map = pdf_to_bool(pdf_dict_gets(action, "IsMap"));
ld.ld.uri.uri = pdf_to_utf8(doc, pdf_dict_gets(action, "URI"));
}
else if (!strcmp(pdf_to_name(obj), "Launch"))
{
ld.kind = FZ_LINK_LAUNCH;
file_spec = pdf_dict_gets(action, "F");
ld.ld.launch.file_spec = pdf_parse_file_spec(doc, file_spec);
ld.ld.launch.new_window = pdf_to_int(pdf_dict_gets(action, "NewWindow"));
ld.ld.launch.is_uri = !strcmp(pdf_to_name(pdf_dict_gets(file_spec, "FS")), "URL");
}
else if (!strcmp(pdf_to_name(obj), "Named"))
{
ld.kind = FZ_LINK_NAMED;
ld.ld.named.named = fz_strdup(ctx, pdf_to_name(pdf_dict_gets(action, "N")));
}
else if (!strcmp(pdf_to_name(obj), "GoToR"))
{
dest = pdf_dict_gets(action, "D");
file_spec = pdf_dict_gets(action, "F");
ld = pdf_parse_link_dest(doc, FZ_LINK_GOTOR, dest);
ld.ld.gotor.file_spec = pdf_parse_file_spec(doc, file_spec);
ld.ld.gotor.new_window = pdf_to_int(pdf_dict_gets(action, "NewWindow"));
}
return ld;
}
static fz_link *
pdf_load_link(pdf_document *doc, pdf_obj *dict, const fz_matrix *page_ctm)
{
pdf_obj *action;
pdf_obj *obj;
fz_rect bbox;
fz_context *ctx = doc->ctx;
fz_link_dest ld;
obj = pdf_dict_gets(dict, "Rect");
if (obj)
pdf_to_rect(ctx, obj, &bbox);
else
bbox = fz_empty_rect;
fz_transform_rect(&bbox, page_ctm);
obj = pdf_dict_gets(dict, "Dest");
if (obj)
ld = pdf_parse_link_dest(doc, FZ_LINK_GOTO, obj);
else
{
action = pdf_dict_gets(dict, "A");
/* fall back to additional action button's down/up action */
if (!action)
action = pdf_dict_getsa(pdf_dict_gets(dict, "AA"), "U", "D");
ld = pdf_parse_action(doc, action);
}
if (ld.kind == FZ_LINK_NONE)
return NULL;
return fz_new_link(ctx, &bbox, ld);
}
fz_link *
pdf_load_link_annots(pdf_document *doc, pdf_obj *annots, const fz_matrix *page_ctm)
{
fz_link *link, *head, *tail;
pdf_obj *obj;
int i, n;
head = tail = NULL;
link = NULL;
n = pdf_array_len(annots);
for (i = 0; i < n; i++)
{
/* FIXME: Move the try/catch out of the loop for performance? */
fz_try(doc->ctx)
{
obj = pdf_array_get(annots, i);
link = pdf_load_link(doc, obj, page_ctm);
}
fz_catch(doc->ctx)
{
fz_rethrow_if(doc->ctx, FZ_ERROR_TRYLATER);
link = NULL;
}
if (link)
{
if (!head)
head = tail = link;
else
{
tail->next = link;
tail = link;
}
}
}
return head;
}
void
pdf_drop_annot(fz_context *ctx, pdf_annot *annot)
{
pdf_annot *next;
while (annot)
{
next = annot->next;
if (annot->ap)
pdf_drop_xobject(ctx, annot->ap);
pdf_drop_obj(annot->obj);
fz_free(ctx, annot);
annot = next;
}
}
void
pdf_transform_annot(pdf_annot *annot)
{
fz_rect bbox = annot->ap->bbox;
fz_rect rect = annot->rect;
float w, h, x, y;
fz_transform_rect(&bbox, &annot->ap->matrix);
if (bbox.x1 == bbox.x0)
w = 0;
else
w = (rect.x1 - rect.x0) / (bbox.x1 - bbox.x0);
if (bbox.y1 == bbox.y0)
h = 0;
else
h = (rect.y1 - rect.y0) / (bbox.y1 - bbox.y0);
x = rect.x0 - bbox.x0;
y = rect.y0 - bbox.y0;
fz_pre_scale(fz_translate(&annot->matrix, x, y), w, h);
}
fz_annot_type pdf_annot_obj_type(pdf_obj *obj)
{
char *subtype = pdf_to_name(pdf_dict_gets(obj, "Subtype"));
if (!strcmp(subtype, "Text"))
return FZ_ANNOT_TEXT;
else if (!strcmp(subtype, "Link"))
return FZ_ANNOT_LINK;
else if (!strcmp(subtype, "FreeText"))
return FZ_ANNOT_FREETEXT;
else if (!strcmp(subtype, "Line"))
return FZ_ANNOT_LINE;
else if (!strcmp(subtype, "Square"))
return FZ_ANNOT_SQUARE;
else if (!strcmp(subtype, "Circle"))
return FZ_ANNOT_CIRCLE;
else if (!strcmp(subtype, "Polygon"))
return FZ_ANNOT_POLYGON;
else if (!strcmp(subtype, "PolyLine"))
return FZ_ANNOT_POLYLINE;
else if (!strcmp(subtype, "Highlight"))
return FZ_ANNOT_HIGHLIGHT;
else if (!strcmp(subtype, "Underline"))
return FZ_ANNOT_UNDERLINE;
else if (!strcmp(subtype, "Squiggly"))
return FZ_ANNOT_SQUIGGLY;
else if (!strcmp(subtype, "StrikeOut"))
return FZ_ANNOT_STRIKEOUT;
else if (!strcmp(subtype, "Stamp"))
return FZ_ANNOT_STAMP;
else if (!strcmp(subtype, "Caret"))
return FZ_ANNOT_CARET;
else if (!strcmp(subtype, "Ink"))
return FZ_ANNOT_INK;
else if (!strcmp(subtype, "Popup"))
return FZ_ANNOT_POPUP;
else if (!strcmp(subtype, "FileAttachment"))
return FZ_ANNOT_FILEATTACHMENT;
else if (!strcmp(subtype, "Sound"))
return FZ_ANNOT_SOUND;
else if (!strcmp(subtype, "Movie"))
return FZ_ANNOT_MOVIE;
else if (!strcmp(subtype, "Widget"))
return FZ_ANNOT_WIDGET;
else if (!strcmp(subtype, "Screen"))
return FZ_ANNOT_SCREEN;
else if (!strcmp(subtype, "PrinterMark"))
return FZ_ANNOT_PRINTERMARK;
else if (!strcmp(subtype, "TrapNet"))
return FZ_ANNOT_TRAPNET;
else if (!strcmp(subtype, "Watermark"))
return FZ_ANNOT_WATERMARK;
else if (!strcmp(subtype, "3D"))
return FZ_ANNOT_3D;
else
return -1;
}
void
pdf_load_annots(pdf_document *doc, pdf_page *page, pdf_obj *annots)
{
pdf_annot *annot, **itr;
pdf_obj *obj, *ap, *as, *n, *rect;
int i, len, keep_annot;
fz_context *ctx = doc->ctx;
fz_var(annot);
fz_var(itr);
fz_var(keep_annot);
itr = &page->annots;
len = pdf_array_len(annots);
/*
Create an initial linked list of pdf_annot structures with only the obj field
filled in. We do this because update_appearance has the potential to change
the annot array, so we don't want to be iterating through the array while
that happens.
*/
fz_try(ctx)
{
for (i = 0; i < len; i++)
{
obj = pdf_array_get(annots, i);
annot = fz_malloc_struct(ctx, pdf_annot);
annot->obj = pdf_keep_obj(obj);
annot->page = page;
annot->next = NULL;
*itr = annot;
itr = &annot->next;
}
}
fz_catch(ctx)
{
pdf_drop_annot(ctx, page->annots);
page->annots = NULL;
fz_rethrow(ctx);
}
/*
Iterate through the newly created annot linked list, using a double pointer to
facilitate deleting broken annotations.
*/
itr = &page->annots;
while (*itr)
{
annot = *itr;
fz_try(ctx)
{
pdf_hotspot *hp = &doc->hotspot;
n = NULL;
if (doc->update_appearance)
doc->update_appearance(doc, annot);
obj = annot->obj;
rect = pdf_dict_gets(obj, "Rect");
ap = pdf_dict_gets(obj, "AP");
as = pdf_dict_gets(obj, "AS");
/* We only collect annotations with an appearance
* stream into this list, so remove any that don't
* (such as links) and continue. */
keep_annot = pdf_is_dict(ap);
if (!keep_annot)
break;
if (hp->num == pdf_to_num(obj)
&& hp->gen == pdf_to_gen(obj)
&& (hp->state & HOTSPOT_POINTER_DOWN))
{
n = pdf_dict_gets(ap, "D"); /* down state */
}
if (n == NULL)
n = pdf_dict_gets(ap, "N"); /* normal state */
/* lookup current state in sub-dictionary */
if (!pdf_is_stream(doc, pdf_to_num(n), pdf_to_gen(n)))
n = pdf_dict_get(n, as);
pdf_to_rect(ctx, rect, &annot->rect);
annot->pagerect = annot->rect;
fz_transform_rect(&annot->pagerect, &page->ctm);
annot->ap = NULL;
annot->annot_type = pdf_annot_obj_type(obj);
annot->widget_type = annot->annot_type == FZ_ANNOT_WIDGET ? pdf_field_type(doc, obj) : PDF_WIDGET_TYPE_NOT_WIDGET;
if (pdf_is_stream(doc, pdf_to_num(n), pdf_to_gen(n)))
{
annot->ap = pdf_load_xobject(doc, n);
pdf_transform_annot(annot);
annot->ap_iteration = annot->ap->iteration;
}
if (obj == doc->focus_obj)
doc->focus = annot;
/* Move to next item in the linked list */
itr = &annot->next;
}
fz_catch(ctx)
{
if (fz_caught(ctx) == FZ_ERROR_TRYLATER)
{
pdf_drop_annot(ctx, page->annots);
page->annots = NULL;
fz_rethrow(ctx);
}
keep_annot = 0;
fz_warn(ctx, "ignoring broken annotation");
}
if (!keep_annot)
{
/* Move to next item in the linked list, dropping this one */
*itr = annot->next;
annot->next = NULL; /* Required because pdf_drop_annot follows the "next" chain */
pdf_drop_annot(ctx, annot);
}
}
page->annot_tailp = itr;
}
pdf_annot *
pdf_first_annot(pdf_document *doc, pdf_page *page)
{
return page ? page->annots : NULL;
}
pdf_annot *
pdf_next_annot(pdf_document *doc, pdf_annot *annot)
{
return annot ? annot->next : NULL;
}
fz_rect *
pdf_bound_annot(pdf_document *doc, pdf_annot *annot, fz_rect *rect)
{
if (rect == NULL)
return NULL;
if (annot)
*rect = annot->pagerect;
else
*rect = fz_empty_rect;
return rect;
}
fz_annot_type
pdf_annot_type(pdf_annot *annot)
{
return annot->annot_type;
}
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