--- /dev/null
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/*
+ * Implements hyperlink functionality for Djvu files.
+ * Copyright (C) 2006 Pauli Virtanen <pav@iki.fi>
+ *
+ * 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, 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.
+ */
+
+#include "djvu-document.h"
+#include "djvu-links.h"
+#include "djvu-document-private.h"
+#include "ev-document-links.h"
+
+#include <libdjvu/ddjvuapi.h>
+#include <libdjvu/miniexp.h>
+#include <glib.h>
+#include <string.h>
+
+static gboolean number_from_miniexp(miniexp_t sexp, int *number)
+{
+ if (miniexp_numberp (sexp)) {
+ *number = miniexp_to_int (sexp);
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static gboolean string_from_miniexp(miniexp_t sexp, const char **str)
+{
+ if (miniexp_stringp (sexp)) {
+ *str = miniexp_to_str (sexp);
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static gboolean number_from_string_10(const gchar *str, guint64 *number)
+{
+ gchar *end_ptr;
+
+ *number = g_ascii_strtoull(str, &end_ptr, 10);
+ if (*end_ptr == '\0') {
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static EvLinkDest *
+get_djvu_link_dest (const DjvuDocument *djvu_document, const gchar *link_name, int base_page)
+{
+ guint64 page_num = 0;
+ gchar *end_ptr;
+
+ /* #pagenum, #+pageoffset, #-pageoffset */
+ if (g_str_has_prefix (link_name, "#")) {
+ if (base_page > 0 && g_str_has_prefix (link_name+1, "+")) {
+ if (number_from_string_10 (link_name + 2, &page_num)) {
+ return ev_link_dest_new_page (base_page + page_num);
+ }
+ } else if (base_page > 0 && g_str_has_prefix (link_name+1, "-")) {
+ if (number_from_string_10 (link_name + 2, &page_num)) {
+ return ev_link_dest_new_page (base_page - page_num);
+ }
+ } else {
+ if (number_from_string_10 (link_name + 1, &page_num)) {
+ return ev_link_dest_new_page (page_num - 1);
+ }
+ }
+ } else {
+ /* FIXME: component file identifiers */
+ }
+
+ return NULL;
+}
+
+static EvLinkAction *
+get_djvu_link_action (const DjvuDocument *djvu_document, const gchar *link_name, int base_page)
+{
+ EvLinkDest *ev_dest = NULL;
+ EvLinkAction *ev_action = NULL;
+
+ ev_dest = get_djvu_link_dest (djvu_document, link_name, base_page);
+
+ if (ev_dest) {
+ ev_action = ev_link_action_new_dest (ev_dest);
+ } else if (strstr(link_name, "://") != NULL) {
+ /* It's probably an URI */
+ ev_action = ev_link_action_new_external_uri (link_name);
+ } else {
+ /* FIXME: component file identifiers */
+ }
+
+ return ev_action;
+}
+
+/**
+ * Builds the index GtkTreeModel from DjVu s-expr
+ *
+ * (bookmarks
+ * ("title1" "dest1"
+ * ("title12" "dest12"
+ * ... )
+ * ... )
+ * ("title2" "dest2"
+ * ... )
+ * ... )
+ */
+static void
+build_tree (const DjvuDocument *djvu_document,
+ GtkTreeModel *model,
+ GtkTreeIter *parent,
+ miniexp_t iter)
+{
+ const char *title, *link_dest;
+ char *title_markup;
+
+ EvLinkAction *ev_action = NULL;
+ EvLink *ev_link = NULL;
+ GtkTreeIter tree_iter;
+
+ if (miniexp_car (iter) == miniexp_symbol ("bookmarks")) {
+ /* The (bookmarks) cons */
+ iter = miniexp_cdr (iter);
+ } else if ( miniexp_length (iter) >= 2 ) {
+ /* An entry */
+ if (!string_from_miniexp (miniexp_car (iter), &title)) goto unknown_entry;
+ if (!string_from_miniexp (miniexp_cadr (iter), &link_dest)) goto unknown_entry;
+
+ title_markup = g_markup_escape_text (title, -1);
+ ev_action = get_djvu_link_action (djvu_document, link_dest, -1);
+
+ if (g_str_has_suffix (link_dest, ".djvu")) {
+ /* FIXME: component file identifiers */
+ } else if (ev_action) {
+ ev_link = ev_link_new (title, ev_action);
+ gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
+ gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
+ EV_DOCUMENT_LINKS_COLUMN_MARKUP, title_markup,
+ EV_DOCUMENT_LINKS_COLUMN_LINK, ev_link,
+ EV_DOCUMENT_LINKS_COLUMN_EXPAND, FALSE,
+ -1);
+ } else {
+ gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
+ gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
+ EV_DOCUMENT_LINKS_COLUMN_MARKUP, title_markup,
+ EV_DOCUMENT_LINKS_COLUMN_EXPAND, FALSE,
+ -1);
+ }
+
+ g_free (title_markup);
+
+ iter = miniexp_cddr (iter);
+ parent = &tree_iter;
+ } else {
+ goto unknown_entry;
+ }
+
+ for (; iter != miniexp_nil; iter = miniexp_cdr (iter)) {
+ build_tree (djvu_document, model, parent, miniexp_car (iter));
+ }
+ return;
+
+ unknown_entry:
+ g_warning ("DjvuLibre error: Unknown entry in bookmarks");
+ return;
+}
+
+static gboolean
+get_djvu_hyperlink_area (ddjvu_pageinfo_t *page_info,
+ miniexp_t sexp,
+ EvLinkMapping *ev_link_mapping)
+{
+ miniexp_t iter;
+ ddjvu_pageinfo_t info;
+
+ iter = sexp;
+
+ if ((miniexp_car (iter) == miniexp_symbol ("rect") || miniexp_car (iter) == miniexp_symbol ("oval"))
+ && miniexp_length (iter) == 5) {
+ /* FIXME: get bounding box for (oval) since Evince doesn't support shaped links */
+ int minx, miny, width, height;
+
+ iter = miniexp_cdr (iter);
+ if (!number_from_miniexp (miniexp_car (iter), &minx)) goto unknown_link;
+ iter = miniexp_cdr (iter);
+ if (!number_from_miniexp (miniexp_car (iter), &miny)) goto unknown_link;
+ iter = miniexp_cdr (iter);
+ if (!number_from_miniexp (miniexp_car (iter), &width)) goto unknown_link;
+ iter = miniexp_cdr (iter);
+ if (!number_from_miniexp (miniexp_car (iter), &height)) goto unknown_link;
+
+ ev_link_mapping->x1 = minx;
+ ev_link_mapping->x2 = (minx + width);
+ ev_link_mapping->y1 = (page_info->height - (miny + height));
+ ev_link_mapping->y2 = (page_info->height - miny);
+ } else if (miniexp_car (iter) == miniexp_symbol ("poly")
+ && miniexp_length (iter) >= 5 && miniexp_length (iter) % 2 == 1) {
+
+ /* FIXME: get bounding box since Evince doesn't support shaped links */
+ int minx = G_MAXINT, miny = G_MAXINT;
+ int maxx = G_MININT, maxy = G_MININT;
+
+ iter = miniexp_cdr(iter);
+ while (iter != miniexp_nil) {
+ int x, y;
+
+ if (!number_from_miniexp (miniexp_car(iter), &x)) goto unknown_link;
+ iter = miniexp_cdr (iter);
+ if (!number_from_miniexp (miniexp_car(iter), &y)) goto unknown_link;
+ iter = miniexp_cdr (iter);
+
+ minx = MIN (minx, x);
+ miny = MIN (miny, y);
+ maxx = MAX (maxx, x);
+ maxy = MAX (maxy, y);
+ }
+
+ ev_link_mapping->x1 = minx;
+ ev_link_mapping->x2 = maxx;
+ ev_link_mapping->y1 = (page_info->height - maxy);
+ ev_link_mapping->y2 = (page_info->height - miny);
+ } else {
+ /* unknown */
+ goto unknown_link;
+ }
+
+ return TRUE;
+
+ unknown_link:
+ g_warning("DjvuLibre error: Unknown hyperlink area %s", miniexp_to_name(miniexp_car(sexp)));
+ return FALSE;
+}
+
+static EvLinkMapping *
+get_djvu_hyperlink_mapping (DjvuDocument *djvu_document,
+ int page,
+ ddjvu_pageinfo_t *page_info,
+ miniexp_t sexp)
+{
+ EvLinkMapping *ev_link_mapping = NULL;
+ EvLinkAction *ev_action = NULL;
+ miniexp_t iter;
+ const char *url, *url_target, *comment;
+
+ ev_link_mapping = g_new (EvLinkMapping, 1);
+
+ iter = sexp;
+
+ if (miniexp_car (iter) != miniexp_symbol ("maparea")) goto unknown_mapping;
+
+ iter = miniexp_cdr(iter);
+
+ if (miniexp_caar(iter) == miniexp_symbol("url")) {
+ if (!string_from_miniexp (miniexp_cadr (miniexp_car (iter)), &url)) goto unknown_mapping;
+ if (!string_from_miniexp (miniexp_caddr (miniexp_car (iter)), &url_target)) goto unknown_mapping;
+ } else {
+ if (!string_from_miniexp (miniexp_car(iter), &url)) goto unknown_mapping;
+ url_target = NULL;
+ }
+
+ iter = miniexp_cdr (iter);
+ if (!string_from_miniexp (miniexp_car(iter), &comment)) goto unknown_mapping;
+
+ iter = miniexp_cdr (iter);
+ if (!get_djvu_hyperlink_area (page_info, miniexp_car(iter), ev_link_mapping)) goto unknown_mapping;
+
+ iter = miniexp_cdr (iter);
+ /* FIXME: DjVu hyperlink attributes are ignored */
+
+ ev_action = get_djvu_link_action (djvu_document, url, page);
+ if (!ev_action) goto unknown_mapping;
+
+ ev_link_mapping->link = ev_link_new (comment, ev_action);
+
+ return ev_link_mapping;
+
+ unknown_mapping:
+ if (ev_link_mapping) g_free(ev_link_mapping);
+ g_warning("DjvuLibre error: Unknown hyperlink %s", miniexp_to_name(miniexp_car(sexp)));
+ return NULL;
+}
+
+
+gboolean
+djvu_links_has_document_links (EvDocumentLinks *document_links)
+{
+ DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
+ miniexp_t outline;
+
+ while ((outline = ddjvu_document_get_outline (djvu_document->d_document)) == miniexp_dummy)
+ djvu_handle_events (djvu_document, TRUE);
+
+ if (outline) {
+ ddjvu_miniexp_release (djvu_document->d_document, outline);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+GList *
+djvu_links_get_links (EvDocumentLinks *document_links,
+ gint page,
+ double scale_factor)
+{
+ DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
+ GList *retval = NULL;
+ miniexp_t page_annotations = miniexp_nil;
+ miniexp_t *hyperlinks = NULL, *iter = NULL;
+ EvLinkMapping *ev_link_mapping;
+ ddjvu_pageinfo_t page_info;
+
+ while ((page_annotations = ddjvu_document_get_pageanno (djvu_document->d_document, page)) == miniexp_dummy)
+ djvu_handle_events (djvu_document, TRUE);
+
+ while (ddjvu_document_get_pageinfo (djvu_document->d_document, page, &page_info) < DDJVU_JOB_OK)
+ djvu_handle_events(djvu_document, TRUE);
+
+ if (page_annotations) {
+ hyperlinks = ddjvu_anno_get_hyperlinks (page_annotations);
+ if (hyperlinks) {
+ for (iter = hyperlinks; *iter; ++iter) {
+ ev_link_mapping = get_djvu_hyperlink_mapping (djvu_document, page, &page_info, *iter);
+ if (ev_link_mapping) {
+ ev_link_mapping->x1 *= scale_factor;
+ ev_link_mapping->x2 *= scale_factor;
+ ev_link_mapping->y1 *= scale_factor;
+ ev_link_mapping->y2 *= scale_factor;
+ retval = g_list_prepend (retval, ev_link_mapping);
+ }
+ }
+ free (hyperlinks);
+ }
+ ddjvu_miniexp_release (djvu_document->d_document, page_annotations);
+ }
+
+ return retval;
+}
+
+EvLinkDest *
+djvu_links_find_link_dest (EvDocumentLinks *document_links,
+ const gchar *link_name)
+{
+ DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
+ EvLinkDest *ev_dest = NULL;
+
+ ev_dest = get_djvu_link_dest (DJVU_DOCUMENT (document_links), link_name, -1);
+
+ if (!ev_dest) {
+ g_warning ("DjvuLibre error: unknown link destination %s", link_name);
+ }
+
+ return ev_dest;
+}
+
+GtkTreeModel *
+djvu_links_get_links_model (EvDocumentLinks *document_links)
+{
+ DjvuDocument *djvu_document = DJVU_DOCUMENT (document_links);
+ GtkTreeModel *model = NULL;
+ miniexp_t outline = miniexp_nil;
+
+ while ((outline = ddjvu_document_get_outline (djvu_document->d_document)) == miniexp_dummy)
+ djvu_handle_events (djvu_document, TRUE);
+
+ if (outline) {
+ model = (GtkTreeModel *) gtk_tree_store_new (EV_DOCUMENT_LINKS_COLUMN_NUM_COLUMNS,
+ G_TYPE_STRING,
+ G_TYPE_OBJECT,
+ G_TYPE_BOOLEAN);
+ build_tree (djvu_document, model, NULL, outline);
+
+ ddjvu_miniexp_release (djvu_document->d_document, outline);
+ }
+
+ return model;
+}
https://www.fi.muni.cz/~kas/git / evince.git / commitdiff