diff options
Diffstat (limited to 'libdocument/ev-document-factory.c')
| -rw-r--r-- | libdocument/ev-document-factory.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/libdocument/ev-document-factory.c b/libdocument/ev-document-factory.c new file mode 100644 index 00000000..0ace5ec8 --- /dev/null +++ b/libdocument/ev-document-factory.c @@ -0,0 +1,397 @@ +/* -*- 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); +} |