inicial

1 files changed, 397 insertions, 0 deletions

diff --git a/libdocument/ev-document-factory.c b/libdocument/ev-document-factory.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/*
+ *  Copyright (C) 2005, Red Hat, Inc. 
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include <gio/gio.h>
+#include <glib/gstdio.h>
+#include <glib/gi18n-lib.h>
+#include <gtk/gtk.h>
+
+#include "ev-backends-manager.h"
+#include "ev-document-factory.h"
+#include "ev-file-helpers.h"
+
+#ifdef ENABLE_PIXBUF
+static GList*
+gdk_pixbuf_mime_type_list ()
+{
+	GSList *formats, *list;
+	GList *result = NULL;
+
+	formats = gdk_pixbuf_get_formats ();
+	for (list = formats; list != NULL; list = list->next) {
+		GdkPixbufFormat *format = list->data;
+		gchar          **mime_types;
+
+		if (gdk_pixbuf_format_is_disabled (format))
+			continue;
+
+		mime_types = gdk_pixbuf_format_get_mime_types (format);
+		result = g_list_prepend (result, mime_types); 
+	}
+	g_slist_free (formats);
+
+	return result;
+}
+
+/* Would be nice to have this in gdk-pixbuf */
+static gboolean
+mime_type_supported_by_gdk_pixbuf (const gchar *mime_type)
+{
+	GList *mime_types;
+	GList *list;
+	gboolean retval = FALSE;
+
+	mime_types = gdk_pixbuf_mime_type_list ();
+	for (list = mime_types; list; list = list->next) {
+		gchar      **mtypes = (gchar **)list->data;
+		const gchar *mtype;
+		gint         i = 0;
+
+		while ((mtype = mtypes[i++])) {
+			if (strcmp (mtype, mime_type) == 0) {
+				retval = TRUE;
+				break;
+			}
+		}
+	}
+
+	g_list_foreach (mime_types, (GFunc)g_strfreev, NULL);
+	g_list_free (mime_types);
+
+	return retval;
+}
+#endif /* ENABLE_PIXBUF */
+
+static EvCompressionType
+get_compression_from_mime_type (const gchar *mime_type)
+{
+	gchar type[3];
+	gchar *p;
+
+	if (!(p = g_strrstr (mime_type, "/")))
+		return EV_COMPRESSION_NONE;
+
+	if (sscanf (++p, "x-%2s%*s", type) == 1) {
+		if (g_ascii_strcasecmp (type, "gz") == 0)
+			return EV_COMPRESSION_GZIP;
+		else if (g_ascii_strcasecmp (type, "bz") == 0)
+			return EV_COMPRESSION_BZIP2;
+	}
+
+	return EV_COMPRESSION_NONE;
+}
+
+
+/*
+ * get_document_from_uri:
+ * @uri: the document URI
+ * @fast: whether to use fast MIME type detection
+ * @compression: a location to store the document's compression type
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Creates a #EvDocument instance for the document at @uri, using either
+ * fast or slow MIME type detection. If a document could be created,
+ * @compression is filled in with the document's compression type.
+ * On error, %NULL is returned and @error filled in.
+ * 
+ * Returns: a new #EvDocument instance, or %NULL on error with @error filled in
+ */
+static EvDocument *
+get_document_from_uri (const char        *uri,
+		       gboolean           fast,
+		       EvCompressionType *compression,
+		       GError           **error)
+{
+	EvDocument *document = NULL;
+	gchar      *mime_type = NULL;
+	GError     *err = NULL;
+
+	*compression = EV_COMPRESSION_NONE;
+
+	mime_type = ev_file_get_mime_type (uri, fast, &err);
+
+	if (mime_type == NULL) {
+		g_free (mime_type);
+
+		if (err == NULL) {
+			g_set_error_literal (error,
+                                             EV_DOCUMENT_ERROR,
+                                             EV_DOCUMENT_ERROR_INVALID,
+                                             _("Unknown MIME Type"));
+		} else {
+			g_propagate_error (error, err);
+		}
+		
+		return NULL;
+	}
+
+	document = ev_backends_manager_get_document (mime_type);
+	
+#ifdef ENABLE_PIXBUF
+	if (!document && mime_type_supported_by_gdk_pixbuf (mime_type))
+		document = ev_backends_manager_get_document ("image/*");
+#endif /* ENABLE_PIXBUF */
+
+	if (document == NULL) {
+		gchar *content_type, *mime_desc = NULL;
+
+		content_type = g_content_type_from_mime_type (mime_type);
+		if (content_type)
+			mime_desc = g_content_type_get_description (content_type);
+
+		g_set_error (error,
+			     EV_DOCUMENT_ERROR,	
+			     EV_DOCUMENT_ERROR_INVALID,
+			     _("File type %s (%s) is not supported"),
+			     mime_desc ? mime_desc : "-", mime_type);
+		g_free (mime_desc);
+		g_free (content_type);
+		g_free (mime_type);
+
+		return NULL;
+	}
+
+	*compression = get_compression_from_mime_type (mime_type);
+
+	g_free (mime_type);
+	
+        return document;
+}
+
+static void
+free_uncompressed_uri (gchar *uri_unc)
+{
+	if (!uri_unc)
+		return;
+
+	ev_tmp_uri_unlink (uri_unc);
+	g_free (uri_unc);
+}
+
+/**
+ * ev_document_factory_get_document:
+ * @uri: an URI
+ * @error: a #GError location to store an error, or %NULL
+ *
+ * Creates a #EvDocument for the document at @uri; or, if no backend handling
+ * the document's type is found, or an error occurred on opening the document,
+ * returns %NULL and fills in @error.
+ * If the document is encrypted, it is returned but also @error is set to
+ * %EV_DOCUMENT_ERROR_ENCRYPTED.
+ *
+ * Returns: a new #EvDocument, or %NULL.
+ */
+EvDocument *
+ev_document_factory_get_document (const char *uri, GError **error)
+{
+	EvDocument *document;
+	int result;
+	EvCompressionType compression;
+	gchar *uri_unc = NULL;
+	GError *err = NULL;
+
+	g_return_val_if_fail (uri != NULL, NULL);
+
+	document = get_document_from_uri (uri, TRUE, &compression, &err);
+	g_assert (document != NULL || err != NULL);
+
+	if (document != NULL) {
+		uri_unc = ev_file_uncompress (uri, compression, &err);
+		if (uri_unc) {
+			g_object_set_data_full (G_OBJECT (document),
+						"uri-uncompressed",
+						uri_unc,
+						(GDestroyNotify) free_uncompressed_uri);
+		} else if (err != NULL) {
+			/* Error uncompressing file */
+			g_object_unref (document);
+			g_propagate_error (error, err);
+			return NULL;
+		}
+
+		result = ev_document_load (document, uri_unc ? uri_unc : uri, &err);
+
+		if (result == FALSE || err) {
+			if (err &&
+			    g_error_matches (err, EV_DOCUMENT_ERROR, EV_DOCUMENT_ERROR_ENCRYPTED)) {
+				g_propagate_error (error, err);
+				return document;
+			    }
+			/* else fall through to slow mime code section below */
+		} else {
+			return document;
+		}
+
+		g_object_unref (document);
+		document = NULL;
+	}
+	
+	/* Try again with slow mime detection */
+	g_clear_error (&err);
+	uri_unc = NULL;
+
+	document = get_document_from_uri (uri, FALSE, &compression, &err);
+	if (document == NULL) {
+		g_assert (err != NULL);
+		g_propagate_error (error, err);
+		return NULL;
+	}
+
+	uri_unc = ev_file_uncompress (uri, compression, &err);
+	if (uri_unc) {
+		g_object_set_data_full (G_OBJECT (document),
+					"uri-uncompressed",
+					uri_unc,
+					(GDestroyNotify) free_uncompressed_uri);
+	} else if (err != NULL) {
+		/* Error uncompressing file */
+		g_propagate_error (error, err);
+
+		g_object_unref (document);
+		return NULL;
+	}
+	
+	result = ev_document_load (document, uri_unc ? uri_unc : uri, &err);
+	if (result == FALSE) {
+		if (err == NULL) {
+			/* FIXME: this really should not happen; the backend should
+			 * always return a meaningful error.
+			 */
+			g_set_error_literal (&err,
+                                             EV_DOCUMENT_ERROR,
+                                             EV_DOCUMENT_ERROR_INVALID,
+                                             _("Unknown MIME Type"));
+		} else if (g_error_matches (err, EV_DOCUMENT_ERROR, EV_DOCUMENT_ERROR_ENCRYPTED)) {
+			g_propagate_error (error, err);
+			return document;
+		}
+
+		g_object_unref (document);
+		document = NULL;
+
+		g_propagate_error (error, err);
+	}
+	
+	return document;
+}
+
+static void
+file_filter_add_mime_types (EvTypeInfo *info, GtkFileFilter *filter)
+{
+	const gchar *mime_type;
+	gint         i = 0;
+
+#ifdef ENABLE_PIXBUF
+	if (g_ascii_strcasecmp (info->mime_types[0], "image/*") == 0) {
+		GList *pixbuf_types, *l;
+
+		pixbuf_types = gdk_pixbuf_mime_type_list ();
+		for (l = pixbuf_types; l; l = g_list_next (l)) {
+			gchar **mime_types = (gchar **)l->data;
+			gint    j = 0;
+			
+			while ((mime_type = mime_types[j++]))
+				gtk_file_filter_add_mime_type (filter, mime_type);
+			
+			g_strfreev (mime_types);
+		}
+		g_list_free (pixbuf_types);
+
+		return;
+	}
+#endif /* ENABLE_PIXBUF */
+	
+	while ((mime_type = info->mime_types[i++]))
+		gtk_file_filter_add_mime_type (filter, mime_type);
+}
+
+/**
+ * ev_document_factory_add_filters:
+ * @chooser: a #GtkFileChooser
+ * @document: a #EvDocument, or %NULL
+ *
+ * Adds some file filters to @chooser.
+ 
+ * Always add a "All documents" format.
+ * 
+ * If @document is not %NULL, adds a #GtkFileFilter for @document's MIME type.
+ *
+ * If @document is %NULL, adds a #GtkFileFilter for each document type that evince
+ * can handle.
+ */
+void
+ev_document_factory_add_filters (GtkWidget *chooser, EvDocument *document)
+{
+	GList         *all_types;
+	GtkFileFilter *filter;
+	GtkFileFilter *default_filter;
+	GtkFileFilter *document_filter;
+
+        g_return_if_fail (GTK_IS_FILE_CHOOSER (chooser));
+        g_return_if_fail (document == NULL || EV_IS_DOCUMENT (document));
+
+	all_types = ev_backends_manager_get_all_types_info ();
+	
+	default_filter = document_filter = filter = gtk_file_filter_new ();
+	gtk_file_filter_set_name (filter, _("All Documents"));
+	g_list_foreach (all_types, (GFunc)file_filter_add_mime_types, filter);
+	gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);
+
+	if (document) {
+		EvTypeInfo *info;
+
+		info = ev_backends_manager_get_document_type_info (document);
+		default_filter = filter = gtk_file_filter_new ();
+		gtk_file_filter_set_name (filter, info->desc);
+		file_filter_add_mime_types (info, filter);
+		g_free (info);
+		gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);
+	} else {
+		GList *l;
+
+		for (l = all_types; l; l = g_list_next (l)){
+			EvTypeInfo *info;
+
+			info = (EvTypeInfo *)l->data;
+
+			default_filter = filter = gtk_file_filter_new ();
+			gtk_file_filter_set_name (filter, info->desc);
+			file_filter_add_mime_types (info, filter);
+			gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);
+		}
+	}
+
+	g_list_foreach (all_types, (GFunc)g_free, NULL);
+	g_list_free (all_types);
+
+	filter = gtk_file_filter_new ();
+	gtk_file_filter_set_name (filter, _("All Files"));
+	gtk_file_filter_add_pattern (filter, "*");
+	gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);
+
+	gtk_file_chooser_set_filter (GTK_FILE_CHOOSER (chooser),
+				     document == NULL ? document_filter : default_filter);
+}